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1 - Photocatalytic Degradation of an Anionic Surfactant by Tio2 Nanoparticle under UV Radiation in Aqueous Solutions
Zeinab Yaghoubi Bazkiaei Masoud GiahiIn this paper the photocatalytic degradation of the anionic surfactant, linear alkylbenzene sulfonicacid (LABSA) was investigated using UV radiation in the presence of TiO2. Our findingsdemonstrate that various parameters exert their individual influence on the photocat أکثرIn this paper the photocatalytic degradation of the anionic surfactant, linear alkylbenzene sulfonicacid (LABSA) was investigated using UV radiation in the presence of TiO2. Our findingsdemonstrate that various parameters exert their individual influence on the photocatalytic degradationof surfactant in wastewaters. The mentioned parameters have been categorized as follow: the initialpH of the solution to be degraded, the impacts of oxidizing agents on photocatalytic degradation,amount of TiO2, initial concentration of pollutant and irradiation time. The optimal degradationconditions of LABSA are: 200 mg/L TiO2, pH 6.0, 1mM K2S2O8 and concentration of LABSA 20mg/L. Finally, about 96.14% of LABSA was removed by irradiation in 150 min. تفاصيل المقالة -
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2 - Photocatalytic degradation of Lidocaine HCl using CuO/ZnO nanoparticles
N. Badalpoor M. Giahi S. HabibiIn this paper, the photocatalytic degradation of Lidocaine HCl, an anesthetic was investigated inaqueous solution using CuO/ZnO as a photocatalyst. The degradation was studied under differentconditions including the amount of the photocatalyst, irradiation time, initial أکثرIn this paper, the photocatalytic degradation of Lidocaine HCl, an anesthetic was investigated inaqueous solution using CuO/ZnO as a photocatalyst. The degradation was studied under differentconditions including the amount of the photocatalyst, irradiation time, initial concentration of drug,pH of the system, initial concentration, addition of oxidant on the reaction rate and anion presence.The results showed that the photocatalytic degradation of Lidocaine HCl was strongly influenced bythese parameters. The best conditions for the photocatalytic degradation of Lidocaine HCl wereobtained. The optimum amount of the photocatalyst used is 0.48 g/L. The photodegradationefficiency of Lidocaine HCl increases with the increase of the illumination time. It was found that thephotodegradation efficiency decreased with increasing the initial concentration of Lidocaine HCl.The photodegradation efficiency of Lidocaine HCl was accelerated by adding a small amount ofH2O2. The possible roles of the additives on the reactions and the possible mechanisms of effect werealso discussed. تفاصيل المقالة -
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3 - Photocatalytic Degradation of Triton X-100 by Zinc oxide Nanoparticles
Masoud Giahi Faegheh GhanbariIn this study the application of ZnO nanoparticles to UV photocatalytic degradation of nonionic surfactantTriton X-100 in aqueous media was investigated. The affecting factors on the photodegradation such as TritonX-100 initial concentration, nanocatalyst weight, pH, te أکثرIn this study the application of ZnO nanoparticles to UV photocatalytic degradation of nonionic surfactantTriton X-100 in aqueous media was investigated. The affecting factors on the photodegradation such as TritonX-100 initial concentration, nanocatalyst weight, pH, temperature and other parameters were studied anddescribed in details. The degradation rate was found to be strongly influenced by all the above parameters .Theoptimized conditions for maximum amount of degradation were also determined Results showed that thephotocatalytic degradation process using UV light as an irradiation source, and Nanoparticles of ZnO as aphotocatalyst, was applicable for the degradation of Triton X-100 in aqueous solution and wastewater samples. تفاصيل المقالة -
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4 - photocatalytic degradation of Triton X-100 in aqueous phase with Zinc oxide as a nanoparticle under UV light irradiation
M. Giahi F. GhanbariThe photocatalytic degradation of nonionic surfactant Triton X-100 was studied by a batch process using ZnOcommercial powders as the catalyst on irradiation with UV light and its behaviour comparatively with respect toZnO nanoparticles with diameter size 20 nm. The effe أکثرThe photocatalytic degradation of nonionic surfactant Triton X-100 was studied by a batch process using ZnOcommercial powders as the catalyst on irradiation with UV light and its behaviour comparatively with respect toZnO nanoparticles with diameter size 20 nm. The effects of different conditions such as catalyst type, amount ofthe photocatalyst, pH of the system, initial concentration and electron acceptors were investigated ondegradation. The results showed that the photocatalytic degradation of Triton X-I00 was strongly influenced bythese parameters. Therefore, the best conditions for the photocatalytic degradation of Triton X-100 wereobtained. تفاصيل المقالة -
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5 - Removal of betamethasone sodium phosphate from wastewater using zinc oxide nanoparticles
M. Giahi H. Taghavi S. Habibi Habibi R. SaririThe photocatalytic degradation of betamethasone sodium phosphate was investigated in aqueoussuspensions of zinc oxide nanoparticular with diameter size 20 nm under a variety of conditions.Different parameters such as irradiation time, the amount catalyst (0.12-0.8 g LH) أکثرThe photocatalytic degradation of betamethasone sodium phosphate was investigated in aqueoussuspensions of zinc oxide nanoparticular with diameter size 20 nm under a variety of conditions.Different parameters such as irradiation time, the amount catalyst (0.12-0.8 g LH), initialconcentration of drug (10-50 mgLjand initial pH values (ranging from 3 to II) were investigatedin the presence of various electron acceptors. It was observed that 0.44 gL-I of photocatalyst is theoptimum value for photocatalyst dosage. In the most favorite conditions, the degradationefficiency was obtained 30gL-I for betamethasone sodium phosphate. Finally, the kinetics processwas studied and the photodegradation rate of betamethasone sodium phosphate was found to obeypseudo-first-order kinetics equation represented by the Langmuir-Hinshelwood model. تفاصيل المقالة -
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6 - Photocatalytic degradation of methyl orange and Congo red using C,N,S-tridoped SnO2 nanoparticles
Azita Nouri Ali Fakhri Arezu NouriIn this study, the photocatalytic degradation of methyl orange and Congo red dye was investigated inaqueous solution using C,N,S-tridoped SnO2 nanoparticles as a nano photocatalyst. The degradationwas carried out under different conditions including the photocatalyst am أکثرIn this study, the photocatalytic degradation of methyl orange and Congo red dye was investigated inaqueous solution using C,N,S-tridoped SnO2 nanoparticles as a nano photocatalyst. The degradationwas carried out under different conditions including the photocatalyst amount, initial concentrationand pH of the solution. The results indicated that the degradation of methyl orange and Congo redwas strongly influenced by these parameters. The best conditions for the degradation of methylorange and Congo red were obtained. The optimum value of photocatalyst amount used was 0.4 g/L.It was found that the photodegradation efficiency increase with increasing the initial concentration ofmethyl orange and Congo red. The optimum pH of the system used is 6.5. تفاصيل المقالة -
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7 - استفاده از نقره دوپ شده با نانو ذرات آناتاز TiO2 بر روی سطح زئولیت Fe-ZSM-5 برای حذف رنگ آلی تحت نور UV
نسرین آقاجری زهرا قاسمی حبیب اله یونسی نادر بهرامی فرزمینه و هدف: تخلیه فاضلاب های رنگی حاصل از عملکرد صنایع رنگ رزی به آب های پذیرنده، به دلیل پایداری در محیط زیست، سمی بوده و موجب آسیب به محیط زیست می شود. حذف رنگ از فاضلاب های رنگی با روش های متداول تصفیه فاضلاب مشکل می باشد. بنابراین، فرایند اکسیداسیون پیشرفته روشی مو أکثرزمینه و هدف: تخلیه فاضلاب های رنگی حاصل از عملکرد صنایع رنگ رزی به آب های پذیرنده، به دلیل پایداری در محیط زیست، سمی بوده و موجب آسیب به محیط زیست می شود. حذف رنگ از فاضلاب های رنگی با روش های متداول تصفیه فاضلاب مشکل می باشد. بنابراین، فرایند اکسیداسیون پیشرفته روشی موثر برای حذف این دسته از آلاینده های آلی می باشد. روش بررسی: در این مطالعه از نقره دوپ شده با تیتانیوم دی اکسید بر پایه زئولیت Fe-ZSM-5 برای تجزیه فوتوکاتالیکی رنگ راکتیو 195 از محلول آبی با استفاده از نور UV (فرابنفش) استفاده شد که در این راستا اثر نسبت های مختلف تیتانیوم دی اکسید به Fe-ZSM-5، غلظت رنگ، غلظت فوتوکاتالیست و pH در دمای محیط مورد بررسی قرار گرفت. یافته ها: آنالیز EDXبا تجزیه و تحلیل عنصری نیمه کمی از سطح نشان داد که Ti و نقره با موفقیت روی سطح زئولیت Fe-ZSM-5قرار گرفتند. در تصاویر SEM اندازه، جهت و مورفولوژی فوتوکاتالیست سنتزی مورد بررسی قرار گرفت. که ذرات TiO2 و نقره سنتز شده دارای شکل و اندازه یکنواخت بوده ودارای ابعاد کم تر از 50 نانومتر می باشند. آنالیز EDX درصد وزنی عناصر تشکیل دهنده فوتوکاتالیست سنتزی را 98/19، 48/5، 95/56 و 65/15به ترتیب برای سیلیس، آهن، تیتانیوم و نقره تعیین نمود و آنالیزXRD نیز حضور فاز Fe-ZSM-5، آناتاز TiO2 و نانوذرات نقره را در فوتوکاتالیست سنتز شده تایید نمود. بحث و نتیجه گیری: نتایج نشان داد که کارایی حذف فوتوکاتالیتیکی فوتوکاتالیست نقره دوپ شده با دی اکسید تیتانیوم بر پایه زئولیت Fe-ZSM-5 به طور معنی داری تحت تاثیر pH می باشد. کارایی حذف با افزایش pH کاهش یافت. بهترین کارایی فوتوکاتالیستFe-ZSM-5@TiO2_Ag در حذف رنگ راکتیو 195 (100%) در pH برابر 3، غلظت فوتوکاتالیست 300 میلی گرم بر لیتر، غلظت رنگ برابر 50 میلی گرم بر لیتر در مدت زمان 75 دقیقه و نسبت Ag-TiO2برابر یک به دست آمد. همچنین حداقل کارایی حذف رنگ برابر 32% در pH برابر 9 تحت شرایط بهینه بود. قابلیت استفاده مجدد از فوتوکاتالیست بعد از هفت دور استفاده مکرر از آن معنی دار بود. تفاصيل المقالة -
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8 - تعیین مقدار بهینه نانوذرات دیاکسیدتیتانیوم در کامپوزیت دیاکسیدتیتانیوم/بنتونیت جهت رنگبری سونوفتوکاتالیستی رنگ متیلاورانژ
مهران یوسفی محمد قربانپورزمینه و هدف: یکی از مهمترین آلاینده های محیط زیست در پساب صنایع، رنگ می باشد که برای انسان خطرناک بوده و محیط زیست را آلوده می نماید. هدف از این پژوهش تعیین مقدار بهینه نانوذرات دیاکسیدتیتانیوم در کامپوزیت دیاکسیدتیتانیوم/بنتونیت جهت رنگبری سونوفتوکاتالیستی رنگ متی أکثرزمینه و هدف: یکی از مهمترین آلاینده های محیط زیست در پساب صنایع، رنگ می باشد که برای انسان خطرناک بوده و محیط زیست را آلوده می نماید. هدف از این پژوهش تعیین مقدار بهینه نانوذرات دیاکسیدتیتانیوم در کامپوزیت دیاکسیدتیتانیوم/بنتونیت جهت رنگبری سونوفتوکاتالیستی رنگ متیلاورانژ بود. روش بررسی: در این بررسی، از بنتونیت به عنوان پایه برای تثبیت فتوکاتالیست دیاکسیدتیتانیوم استفاده شد و مقدار بهینه نانوذرات تثبیت شده دیاکسیدتیتانیوم در کامپوزیت دیاکسیدتیتانیوم/بنتونیت جهت رنگبری سونوفتوکاتالیستی رنگ متیلاورانژ مورد ارزیابی قرار گرفت و شرایط بهینه عملکرد فرایند سونوفتوکاتالیستی در حذف رنگ شامل اثر پارامترهای pH ، غلظت متیل اورانژ و غلظت نانوکامپوزیت نیز مورد مطالعه قرار گرفتند. یافتهها:خواص ساختاری فتوکاتالیستهای تثبیت شده و نانوذرات دیاکسیدتیتانیوم بدون پایه با استفاده از آنالیزهای میکروسکوپ الکترونی روبشی، اسپکتروفتومتر طیف جذبی و پراشپرتوایکس مورد بررسی قرار گرفت. در نهایت، امکان استفاده مجدد از فتوکاتالیست در 3 دوره مورد بررسی قرار گرفت. بر اساس نتایج میکروسکوپالکترونیروبشی، کم کردن مقدار دیاکسیدتیتانیوم موجب کاهش تعداد نانو ذرات تشکیل شده بر روی سطح بنتونیت شد. آنالیزهای اسپکتروفتومترطیفجذبی و پراشپرتوایکس نشانگر تشکیل موفقیت آمیز کامپوزیت بود. مقدار بهینه نانوذرات دیاکسیدتیتانیوم در کامپوزیت دیاکسیدتیتانیوم/بنتونیت جهت رنگبری سونوفتوکاتالیستی رنگ متیلاورانژ با نسبت پودر دیاکسیدتیتانیوم به بنتونیت 5:1/2 بدست آمد. بحث و نتیجه گیری: تحقیق انجام شده نشان داد افزایش مقدار فتوکاتالیست در محیط واکنش باعث افزایش سرعت و راندمان واکنش رنگبری شده اما افزایش بیش از اندازه آن تاثیر منفی بر واکنش داشت. بهترین شرایط به دست آمده در تخریب رنگ مورد مطالعه با استفاده از نانو کامپوزیت دیاکسیدتیتانیوم / بنتونیت شامل pH اسیدی 4 بود. با توجه به نتایج بهدست آمده، با افزایش غلظت رنگزا مدت زمان رنگبری افزایش یافت. در نهایت بازده سونوفتوکاتالیستی کامپوزیت پس از سه بار استفاده مجدد قابل قبول بود. تفاصيل المقالة -
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9 - بررسی تخریب فتوکاتالیتیکی نفتالین توسط نانوکاتالیست های دی اکسید تیتانیوم داپ شده با N-S وP تحت نور مرئی
بهمن بنائی فرهنگ تیرگیر امیرحسام حسنی عبدالمجید فدایی سید مهدی برقعیزمینه و هدف: نفتالین یکی از هیدروکربنهای آروماتیک چند حلقهای سمی و خطرناک برای انسان و محیط زیست می باشد و حذف آن از محیط زیست ضروری است. هدف از این تحقیق بررسی تخریب فتوکاتالیتیکی نفتالین از محیطهای آبی با استفاده از نانوکاتالیستهای TiO2-P/SPA و TiO2-N,S/SiO2تحت نو أکثرزمینه و هدف: نفتالین یکی از هیدروکربنهای آروماتیک چند حلقهای سمی و خطرناک برای انسان و محیط زیست می باشد و حذف آن از محیط زیست ضروری است. هدف از این تحقیق بررسی تخریب فتوکاتالیتیکی نفتالین از محیطهای آبی با استفاده از نانوکاتالیستهای TiO2-P/SPA و TiO2-N,S/SiO2تحت نور مرئی در حضور اکسیژن است. روش بررسی: این تحقیق در سال 1399 انجام گرفت. دو فتوکاتالیست TiO2-P/SPA و TiO2-N,S/SiO2به روش سل-ژل سنتز و از آنها برای حذف نفتالین از محیط آبی تحت نور مرئی در حضور اکسیژن، استفاده شد. اثر پارامترهای مختلف از جمله غلظت اولیه نفتالین،pH، مدت زمان تماس بررسی شدند و ساختار این نانو ذرات با استفاده از تصویر EDAX,SEM و آنالیز DRS بررسی گردید. یافته ها: تصاویر میکروسکوپ الکترونی اندازه ذرات فتوکاتالیست های سنتزی را 10 تا20 نانومتر نشان داد و ضخامت لایه نازک فتوکاتالیست TiO2-N,S/SiO2 و TiO2-P/SPA روی میکروگلولهها به ترتیب برابر 68/698 نانومتر و 73/1 میکرومتر بود. آنالیزDRS نشان داد شکاف انرژی هر دو فتوکاتالیست باریک تر از TiO2 شده و فعالیت فتوکاتالیستی آنها به ناحیه نور مرئی انتقال یافته است. در شرایط بهینه حذف نفتالین مقادیر pH، زمان, غلظت نفتالین، و راندمان حذف به ترتیب برای فتوکاتالیست TiO2-N-S ، معادل 5، 50، 25، 23/94 و برای TiO2-P برابر 5، 40، 25، 39/97 به دست آمد (Pv<0.05). بحث و نتیجه گیری: این فتوکاتالیست ها می توانند به عنوان یک روش نوین، موثر و کاربردی در تصفیه آب و پسابهای صنایع حاوی نفتالین، تحت نور خورشید و نور مریی استفاده شوند. تفاصيل المقالة -
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10 - مطالعه تجزیه فتوکاتالیزوری رنگزاهای راکتیو از پساب های نساجی: مدلسازی عددی اجزای محدود و کارهای تجربی
خشایار بدیعی فرامرز دولتی اردهجانی سید ضیاءالدین شفایی تنکابنی نیاز محمد محمودی فرخلقا امینیپساب های محتوی رنگ‌زاهای راکتیو که ممکن است از صنایع مختلف تولید شود اثرات و پیامدهای زیست محیطی بسیاری به همراه دارد. از این رو بررسی امکان حذف این مواد رنگی از پساب‌ها قبل از تخلیه آن ها به محیط زیست اطراف از اهمیت اساسی برخوردار است. در این تحقیق یک مدل ساد أکثرپساب های محتوی رنگ‌زاهای راکتیو که ممکن است از صنایع مختلف تولید شود اثرات و پیامدهای زیست محیطی بسیاری به همراه دارد. از این رو بررسی امکان حذف این مواد رنگی از پساب‌ها قبل از تخلیه آن ها به محیط زیست اطراف از اهمیت اساسی برخوردار است. در این تحقیق یک مدل ساده ریاضی که به روش عددی اجزاء محدود بسط داده شده‌است، ارایه شده که قادر است فرآیند حذف مواد رنگی راکتیو را از پساب های صنعتی شبیه سازی نماید. مدل ریاضی ارایه شده توسط ترکیبی از نرم افزارهای SEEP/W و CTRN/W حل شده است. مدل ابتدا توسط یک مثال در مورد حمل یک ماده آلاینده در سیستم جریان آب در یک محیط متخلخل که به دو روش عددی و تحلیلی بررسی شده است، کالیبره شد. پس از کالیبراسیون مدل، نتایج حاصل از مدل‌سازی با نتایج به دست آمده از یک تحقیق در مقیاس آزمایشگاهی جهت حذف یک رنگ‌زای سیباکرونی راکتیو نارنجی 107 با فتوکاتالیز (UV/TiO2/H2O2) در یک راکتور ناپیوسته(Batch reactor) و همچنین با نتایج حاصل از حل تحلیلی مدل مقایسه شد و همپوشانی مناسبی به دست آمد. بررسی‌های تجربی نشان داد که رنگ‌زاهای سیباکرونی همچون رنگ‌زای راکتیو نارنجی 107 در اثر تابش فرابنفش و در حضور فتوکاتالیزور و عامل اکسید کننده همچون آب اکسیژنه کاملاً رنگ‌بری شده و به ترکیبات معدنی تبدیل می‌شوند. اگرچه تولید چنین پساب‌هایی توسط صنایع مختلف تقریباً اجتناب ناپذیر است، ولی با استفاده از نتایج حاصل از چنین شبیه‌سازی‌هایی می‌توان به طراحی مناسب برنامه‌های مدیریت زیست محیطی پساب‌های صنعتی به منظور به حداقل رساندن اثرات نامطلوب آن پرداخت. تفاصيل المقالة -
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11 - بررسی حذف فتوکاتالیستی سولفات از پساب سنتتیک توسط نانو ذرات اکسید آهن مغناطیسی
حدیث فولادی رویا مافی غلامی صادق قاسمیاز جمله مسایل جدی که در سالهای اخیر به آن توجه گردیده است، نقش گوگرد و ترکیبات مختلف آن هم چون سولفات به عنوان بخشی از آلاینده های موجود در پساب های خروجی است. با توجه به این که امروزه استفاده از نانو مواد در تصفیه آلاینده های محیط بسیار مورد توجه است، هدف از این مطالع أکثراز جمله مسایل جدی که در سالهای اخیر به آن توجه گردیده است، نقش گوگرد و ترکیبات مختلف آن هم چون سولفات به عنوان بخشی از آلاینده های موجود در پساب های خروجی است. با توجه به این که امروزه استفاده از نانو مواد در تصفیه آلاینده های محیط بسیار مورد توجه است، هدف از این مطالعه استفاده از نانو ذرات اکسید آهن مغناطیسی (Fe3O4) تحت تابش UV برای حذف سولفات است. آزمایش ها در سیستم ناپیوسته انجام شد و تاثیر پارامترهای pH، مقدار نانو ذره، زمان تماس و غلظت اولیه سولفات تحت تابش لامپ فرابنفش ( w8) مورد بررسی قرار گرفت، همچنین از متداولترین ایزوترم ها و سینتیکهای جذب برای بررسی حذف سولفات و سرعت واکنش استفاده شد. باتوجه به نتایج، حداکثر راندمان حذف برای سولفات 92/77 درصد است که در pH و زمان تماس برابر 7 و 90 دقیقه و مقدار نانو ذره برابر با 2 گرم در لیتر بدست آمد. داده های این مطالعه تطابق خوبی با ایزوترم لانگمویر نشان دادند . آنالیز سینتیک نشان داد که حذف سولفات با مدل سینتیکی جذب مرتبه دوم مطابقت دارد. در نهایت می توان اذعان نمود که فرآیند فتو کاتالیستی نانو ذرات اکسید آهن مغناطیسی و پرتوی فرابنفش (UV-C) می تواند منجر به کاهش قابل ملاحظه آلاینده سولفات از پساب گردد. تفاصيل المقالة -
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12 - Removing of Acid Red 1 Dye Pollutant from Contaminated Waters by UV/ TiO2/ H2O2 Process Using a Recirculating Tubular Reactor
Kambiz Seyyedi Samira Khoshbin Rasoul PiriDyes are the most important materials in industries which are dangerous to ecological systems due to their toxic properties. This study investigated the photocatalytic efficiency of TiO2 nanoparticles stabilized on a glass plate in order to remove Acid Red1 (AR1) dye in أکثرDyes are the most important materials in industries which are dangerous to ecological systems due to their toxic properties. This study investigated the photocatalytic efficiency of TiO2 nanoparticles stabilized on a glass plate in order to remove Acid Red1 (AR1) dye in an aqueous solution under UV Light. In this research, the photocatalytic decomposition of the AR1 dye was carried out in a batch tubular reactor with a recirculating flow. Effective parameters on the process such as: the initial pH of the solution, the concentration of AR1, the distance of the lamp from the catalysts’ surface, the concentration of H2O2, and the flow rate were studied. The morphological properties of the Titanium dioxide nanoparticles stabilized on the glass plate were investigated through SEM and AFM. The favorite dye removal efficiency for a solution containing 30 mg/L of AR1 was obtained in the pH of 2.5, H2O2 concentration of 10.12 mM, radiation time of 120 min, and the lamp-catalyst surface distance of 10 cm. In these conditions, the dye removal efficiency became approximately 99%. تفاصيل المقالة -
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13 - Synthesis of Cu-TiO2Nanocomposite and Investigation of the Effectiveness of PEG, Pectin, and CMCas Additives
B. Khodadadi M. Sabeti S. Moradi P. Aberomand Azar S. Raeis FarshidRecently, TiO2 has been widely used as a photocatalyst for degradation of environmental pollutants. In the present study, the advantage of metal doping onto TiO2 for enhanced photocatalitic activity has been investigated. Copper-Titanium dioxide nanocomposites were prep أکثرRecently, TiO2 has been widely used as a photocatalyst for degradation of environmental pollutants. In the present study, the advantage of metal doping onto TiO2 for enhanced photocatalitic activity has been investigated. Copper-Titanium dioxide nanocomposites were prepared by the sol-gel method in the presence of Carboxy Methyl Cellulose (CMC), Pectin, and Poly Ethylene Glycol (PEG) as additives. The structures and properties of prepared samples were identified by IR spectra, Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD) methods. Furthermore, the photocatalytic activity under UV-irradiation to remove organic pollutant was investigated. The results have revealed that the photocatalytic activity of the nanocomposite in presence of additives increased. SEM pictures have shown that the particle size of Cu-TiO2 powder with additives was smaller than other samples without any additive. تفاصيل المقالة -
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14 - Preparation, Characterization and Photocatalytic Activity of Ag-Cd-ZnO and Ag-Cu-ZnO Nanostructures
Bahar Khodadadi Maryam Bordbar Maryam SajediIn this study, ZnO nanopowders and ZnO doped with metals (Cu , Ag- doped ZnO) and (Cd, Ag- doped ZnO) were synthesized by the sol-gel method in order to investigation on the codoping effect on the band gap and photocatalytic activity of ZnO. The synthesized samples are أکثرIn this study, ZnO nanopowders and ZnO doped with metals (Cu , Ag- doped ZnO) and (Cd, Ag- doped ZnO) were synthesized by the sol-gel method in order to investigation on the codoping effect on the band gap and photocatalytic activity of ZnO. The synthesized samples are characterized by IR spectroscopy technique. Moreover, the absorption coefficients of the ZnO, Ag-Cd-ZnO and Ag-Cu-ZnO were analyzed by Tauc’s approach and the direct band gap is calculated. According to these results, compared with pure ZnO, the band gap of the Ag-Cd-ZnO and Ag-Cu-ZnO decreases and it is dependent on the content of dopands. Furthermore, photocatalytic activity for all samples was investigated under UV irradiation in an aqueous medium. The results have been revealed that Ag-Cd-ZnO and Ag-Cu-ZnO shown more photocatalytic actitivity in comparison with pure ZnO. تفاصيل المقالة -
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15 - Environmental Remediation of Organic Pollutants in Synthesized and Characterized Aqueous Suspension by Photochemical Method: A Kinetic Study
Z. Emadian Razavi R. Fazaeli M. Yousefi S. GhasemiComparative study of the of azo Dyes (as a class important organic pollutants photodegradation process) in aqueous solution employing H2 O2 /UV and K2 S2 O8 /UV systems in a photochemical reactor were investigated. Lead zirconate titanate [Pb (Zr0.58Ti0.42) O3 ] (PZT) n أکثرComparative study of the of azo Dyes (as a class important organic pollutants photodegradation process) in aqueous solution employing H2 O2 /UV and K2 S2 O8 /UV systems in a photochemical reactor were investigated. Lead zirconate titanate [Pb (Zr0.58Ti0.42) O3 ] (PZT) nanocatalyst was synthesized via the sol-gel method. Then, photocatalytic properties of dopant type on PZT were determined in a UV photoreactor in the presence of different radical generators. These comparative studies showed that PZT/TiO2 and PZT/TiO2 /FeCl3 have higher efficiency than the others. تفاصيل المقالة -
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16 - Comparison of Photocatalytic Activities of Two Different Dyes Using Pt-Modified TiO2 Nanoparticles under Visible Light
Akbar Jodat Mehri Alizad Nikjoo Mahboubeh GhamkharThe photocatalytic degradation of Acid Red 91 (AR91) and Acid Yellow 23 (AY23) with different molecular structures and different substitute groups using Pt modified TiO2 (PtTiO2 ) nanoparticles was investigated in the presence of visible light irradiation. Pt-TiO2 nanop أکثرThe photocatalytic degradation of Acid Red 91 (AR91) and Acid Yellow 23 (AY23) with different molecular structures and different substitute groups using Pt modified TiO2 (PtTiO2 ) nanoparticles was investigated in the presence of visible light irradiation. Pt-TiO2 nanoparticles were prepared with photodiposition method (PD) and characterized by X-ray diffraction (XRD), scanning electron micrographs (SEM), energy dispersive X-ray micro analysis (EDX), transmission electron microscope (TEM), and UV-vis diffuse reflection spectra (DRS) techniques. The DRS results indicated that the deposition of platinum on TiO2 promoted the optical absorption in the visible region and made it possible to be excited by visible light. Pt-modification of the surface of TiO2 increased photocatalytic activity under visible light irradiation, depending on dye structure (functional group and reactivity of dyes). By comparing the removal efficiency of AR91 and AY23 at the similar conditions, it was observed that the photodegradation rate of AR91 was faster than that of AY23. In conclusion, photocatalytic mineralization of the dyes was monitored by total organic carbon (TOC) decrease. Above 82 and 94% mineralization of AY23 and AR91 was observed using 2 h irradiation. تفاصيل المقالة -
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17 - The Influence of Ag Doping on Structural, Optical Properties and Photocatalytic Activity of TiO2/SiO2 Nanocomposite
Bahar KhodadadiIn the present study, TiO 2 /SiO 2 and TiO 2 /SiO 2 /Ag nanocomposite powders were synthesized by sol-gel technique. Moreover, for investigation of the Ag doping effect different concentrations of dopant were added. Structures were characterized by IR spectros أکثرIn the present study, TiO 2 /SiO 2 and TiO 2 /SiO 2 /Ag nanocomposite powders were synthesized by sol-gel technique. Moreover, for investigation of the Ag doping effect different concentrations of dopant were added. Structures were characterized by IR spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive Analytical X-Ray (EDAX), and X-Ray Diffraction (XRD) methods. Furthermore, the absorption coefficients of the samples were analyzed by Tauc’s model and the direct band gaps were calculated. Photocatalytic activity of all samples was investigated under UV irradiation in an aqueous medium. The results were shown that photocatalytic activity improves in the presence of appropriate amount of Ag as dopant. تفاصيل المقالة -
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18 - Optimizing the Factors of Color Concentration, pH and the Amount of Nanoparticles in Removal of R198 Reactive Dye under UV Rays by Zinc Oxide Nanoparticles Extracted from Leaching Residue of Zinc Melting Factory
S. S. Gojrati M. Hajisafari M. M. KhosraviradIn this study, zinc oxide nanoparticles were obtained from purified solution from the zinc melting residue factory in Bafgh. The obtained nanoparticles by various devices were studied and analyzed. The formation, purity and optical properties of zinc oxide nanoparticles أکثرIn this study, zinc oxide nanoparticles were obtained from purified solution from the zinc melting residue factory in Bafgh. The obtained nanoparticles by various devices were studied and analyzed. The formation, purity and optical properties of zinc oxide nanoparticles were investigated by the infrared spectrometer (FTIR) test. Ultimately, these nanostructures were used to investigate their photocatalytic properties in the removal of reactive color R198 under UV rays, which has been widely used color in the textile industry and is harmful for the environment. In the bleaching process of reactive color R198, three effective parameters which include the color concentration, pH and amount of nanoparticle were optimized. The results of X-Ray Diffraction patterns (XRD) represent the crystallinity and hexagonal structure of the samples. According to the Transmitted Electron Microscope (TEM) images, the sample have clear spherical shapes and distinct hexagonal dimensions in the range of 40-120nm. Under optimal conditions with color concentration of 30 ml, pH = 7and the amount of nanoparticle 0.12gm at 120 minutes the bleaching process under ultra-violet rays about 99% of the color was degraded or destroyed. تفاصيل المقالة -
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19 - Measuring the Efficiency and Ranking of Photocatalytic Degradation of Azo dye AR 206 and COD Using Data Envelopment Analysis
Hossein DibachiIn this study a new photocatalyst was prepared and identified using XRD pattern and SEM image. This catalyst is used to decomposition of azo dye Acid Red 206(AR 206) in aqueous solution. In the previous study optimum conditions has been obtained by using experimental de أکثرIn this study a new photocatalyst was prepared and identified using XRD pattern and SEM image. This catalyst is used to decomposition of azo dye Acid Red 206(AR 206) in aqueous solution. In the previous study optimum conditions has been obtained by using experimental design which is parametric method and is not proposed method for converting the inefficient experiments to efficient. Data Envelopment Analysis (DEA) involves an alternative principle for extracting information about a population of observations called Decision Making Units (DMUs) with similar quantitative characteristics. This is reflected by the assumption that each DMU uses the same set of inputs to produce the same set of outputs, but the inputs are consumed and outputs are produced in varying amounts. In this paper the input oriented CCR model and its super-efficiency model are proposed for measuring the efficiency and ranking of photocatalytic degradation of Azo dye AR 206 and Chemical Oxigen Demand (COD) photocatalytic degradation experiments . We consider these experiments as DMUs. Finally inefficient experiments by using of the projection points were converted to the efficient experiments. تفاصيل المقالة -
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20 - Novel functional finishing of wool fabric using reduced graphene oxide/zinc oxide nanocomposite
Loghman KarimiIn this study, a new finishing technique is introduced through treatment of wool fabric with reduced graphene oxide/ZnO nanocomposite. Graphene oxide was coated on to wool fabric by dipping the fabric in graphene oxide solution and drying in an oven. The nanocomposite w أکثرIn this study, a new finishing technique is introduced through treatment of wool fabric with reduced graphene oxide/ZnO nanocomposite. Graphene oxide was coated on to wool fabric by dipping the fabric in graphene oxide solution and drying in an oven. The nanocomposite was synthesized on wool fabric in a single step by reduction of zinc acetate and graphene oxide with sodium hydroxide in the impregnation bath. The homogenous distribution of the reduced graphene oxide/zinc oxide nanocomposite on the fiber surface was confirmed by field emission scanning electron microscopy (FE-SEM), Energy-dispersive X-ray spectroscopy (EDS) and X-ray mapping. X-ray diffraction patterns proved the presence of zinc oxide nanoparticles on the treated wool fabric. Also, the defect analysis based on X-ray photoelectron spectroscopy (XPS) established the composition of the nanocomposite. Other characteristics of treated fabrics such as antibacterial activity, photo-catalytic self-cleaning, electrical resistance, ultraviolet (UV) blocking activity and cytotoxicity were also assessed. The treated wool fabrics possess significant antibacterial activity and photo-catalytic self-cleaning property by degradation of methylene blue under sunlight irradiation. Moreover, this process has no negative effect on cytotoxicity of the treated fabric even reduces electrical resistance and improves UV blocking activity. تفاصيل المقالة -
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21 - Photocatalytic Degradation of Phenol in Water Solution by Phosphotungstic Acid on TiO2/ZnO Nanoparticles as supporting solid
Marzieh Nasiriyan معصومه طباطبایی Seyed Abolghasem MirhoseiniIn this research, a Keggin-type heteropolyoxometalate (H3PWO12O40) supported on TiO2/ZnO nanoparticles were used for degradation of phenol under UV light and H2O2 was used as oxidant. Based on the results, heterogenization of H3PWO12O40 on TiO2/ZnO could be improved pho أکثرIn this research, a Keggin-type heteropolyoxometalate (H3PWO12O40) supported on TiO2/ZnO nanoparticles were used for degradation of phenol under UV light and H2O2 was used as oxidant. Based on the results, heterogenization of H3PWO12O40 on TiO2/ZnO could be improved photocatalytic process and could be considered an appropriate heterogonous photocatalyst in the removing of phenol from aqueous solutions in the presence of hydrogen peroxide. Degradation of phenol in the presence of the H3PWO12O40/ZnO could lead to the disappearance of approximately 95% of phenol under UV irradiation and optimized condition. In the same experiment H3PWO12O40 as homogenous catalyst, removed 70% phenol and heterogenous TiO2/ZnO catalyst removed less than 70% phenol from water solution in the same condition. تفاصيل المقالة -
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22 - Evaluation of Photocatalytic Activity of Fe Doped TiO2 Thin Film Prepared by sol-gel hot dip-coating
Sanaz Naghibi Shohreh Vahed Omid TorabiThe application of Fe–TiO2 photocatalysis using sol–gel method by hot–dipping technique was investigated. Then, the influences of fabrication parameters, molar ratios of Fe to TiO2, the sol temperature, poly ethylene glycol (PEG) content and the number أکثرThe application of Fe–TiO2 photocatalysis using sol–gel method by hot–dipping technique was investigated. Then, the influences of fabrication parameters, molar ratios of Fe to TiO2, the sol temperature, poly ethylene glycol (PEG) content and the number of dipping cycles on the photocatalytic activity in visible light region were mainly studied. The experimental results revealed the sample with the molar ratios of Fe to TiO2: 0.015, the sol temperature: 70 °C, PEG content: 2 wt. % and the number of dipping cycles: 5 showed the best result. The photodegradation efficiency of this sample after 2 h visible light irradiation increased up to 80% and no crack was detected on the surface of the thin film. When the sol temperature increased from 25 to 70 ºC (the boiling point of the sol), its viscosity increased due to the existence of PEG via forming cross linkage. This phenomenon caused to change the microstructure and improve in optical properties. تفاصيل المقالة -
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23 - Investigating structural, optical and photocatalytic properties of hydrothermally synthesized ZnO nanorod arrays with various aspect ratios
Saeed Safa Ali Khayatian eliza rokhsat Mehrdad NajafiZnO nanorods with various aspect ratios (by changing the time of growth between 0-240 min) were synthesized using hydrothermal method and were investigated using XRD, SEM, UV–Vis and PL. It was found that growth time is directly coupled with the length, orientatio أکثرZnO nanorods with various aspect ratios (by changing the time of growth between 0-240 min) were synthesized using hydrothermal method and were investigated using XRD, SEM, UV–Vis and PL. It was found that growth time is directly coupled with the length, orientation and aspect ratio of the nanorod arrays. The optical transmittance of the NR arrays indicated a regular decrement of average transmittance with increasing the aspect ratio of NRs in the visible range. The optical constants (absorption coefficient, extinction coefficient and refractive index) can be account as a function of refractive index were determined. The porous ZnO nanorod with the thickness of ∼ 1560 nm and texture coefficient of 0.96 for (002) plane exhibits the average visible transmittance <60%, refractive index 1.34, packing density 0.26 and lowest optical band gap, was fabricated in the longest time of hydrothermal growth (240 min). As the growth time was increased, the photoluminescence properties was sustained a general weakening tendency and a red-shift of UV-emission peak position. The UV-assisted photocatalytic degradation of 4-Nitrophenol (4-NP) of ZnO NRs were investigated. The considerable photocatalytic performance of ZnO NRs with highest aspect ratio was explained by its porosity and optical characteristics. تفاصيل المقالة -
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24 - Polymer-Assisted Synthesis and Characterization of Nickel Aluminate Nanoparticles for Photodegradation of Methylene Blue
Sogol Bakhtiarvand Seyed Ali Hassanzadeh TabriziA simple polymer-assisted wet chemical method was used to synthesize NiAl2O4 nanopowder. The photocatalytic properties of synthesized powders were investigated for the degradation of methylene blue. For this aim, metal salts and polymeric precursors were dissolved in wa أکثرA simple polymer-assisted wet chemical method was used to synthesize NiAl2O4 nanopowder. The photocatalytic properties of synthesized powders were investigated for the degradation of methylene blue. For this aim, metal salts and polymeric precursors were dissolved in water, and then a crosslinker was added till a gel was formed. The product was calcined to produce nanopowders. XRD results confirmed the formation of nickel aluminate with spinel structure. In addition, the findings showed that the produced NiAl2O4 nanopowders have a particle size range between 35 to 100 nm with a uniform particle size distribution. The optical properties of the samples showed that the bandgap energy of NiAl2O4 is about 3.44 eV. The nickel aluminate nanopowders demonstrated high photocatalytic activity for photodegradation of methylene blue, which could be attributed to their small particle sizes. It seems that the polymer-assisted wet chemical synthesis may open up an effective route for the production of ceramic photocatalyst nanopowders with high quality. تفاصيل المقالة -
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25 - An illustration of photocatalytic properties of ZnO nanorods array films
A Nekoubin H Ghayour Najafabadi M Nasr EsfahaniZnO nanorods array films were coated on a glass template through a two-step chemical process. First, a sol-gel spin coating method was used to produce a ZnO seed layer and after that, the ZnO nanorods arrays were grown on it through a low temperature aqueous method. Syn أکثرZnO nanorods array films were coated on a glass template through a two-step chemical process. First, a sol-gel spin coating method was used to produce a ZnO seed layer and after that, the ZnO nanorods arrays were grown on it through a low temperature aqueous method. Synthesized films were studied by scanning electron microscope (SEM) and X-ray diffractometer (XRD). X-ray diffraction results showed single crystalline wurtzite with a c-axis preferential (002) orientation. The deposited ZnO layers had c-axis orientation, and showed a sharp X-ray diffraction peak at 2θ=34.40 degrees, corresponding to the (002) of hexagonal ZnO crystal. The SEM images showed vertical orientation of rods, and the diameters of rods were under 100 nm. The photocatalytic degradation of XG6 azo dye in aqueous solutions was examined with a combination of ZnO nanorods array film as a photocatalyst and UV light. Results showed that the films are effective in decolorization of dye. تفاصيل المقالة -
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26 - Improving photocatalytic properties of Zn0.95Ni0.04Co0.01O modified by PANI
sara poorarjmand Maryam Kargar Razi Ali Mahjoob Morteza khosraviIn this research, preparation of Zn0.95Ni0.04Co0.01O/PANI (polyaniline) (0.5%, 1% and 1.5% PANI) nano composites was performed by synthesis of pure polyaniline and adsorption of resulted organic chains on the structure of Zn0.95Ni0.04Co0.01O nano particles. The as-prepa أکثرIn this research, preparation of Zn0.95Ni0.04Co0.01O/PANI (polyaniline) (0.5%, 1% and 1.5% PANI) nano composites was performed by synthesis of pure polyaniline and adsorption of resulted organic chains on the structure of Zn0.95Ni0.04Co0.01O nano particles. The as-prepared samples was characterized by X-ray diffraction (XRD), fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM) and BET techniques. According to the X-ray diffraction analysis, pure PANI has semi crystalline structure while all of the composites showed the characteristic peaks of Zn0.95Ni0.04Co0.01O with hexagonal wurtzite structure. The FTIR spectroscopy approved the interactions of PANI chains and Zn0.95Ni0.04Co0.01O nano particles. Field emission scanning electron microscopy analysis revealed amorphous structure of PANI and the spherical shape of nano composite. The BET analysis attributed the largest specific surface area of Zn0.95Ni0.04Co0.01O/PANI (1% PANI) nano composite. The photocatalytic results showed that the dye can be effectively decolorized by Zn0.95Ni0.04Co0.01O/PANI (1% PANI) nano composite. The enhancement of photocatalytic performance is due to the decrease of specific surface area and the high separation efficiency of photo-induced electron-hole pairs. تفاصيل المقالة -
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27 - Efficient photocatalytic desulfurization of thiophene under visible light irradiation over flower-like AgBiS2 photocatalyst
Mehdi Mousavi-Kamazani Reza Rahmatolahzadeh Hassan NajafianHere, we report the production of hierarchical flower-like AgBiS2 nanostructures by an amino acid-modified polyol route. This work indicates that by changing the polyol process conditions including kind of capping agent, reaction time and reflux temperature, the sheet-l أکثرHere, we report the production of hierarchical flower-like AgBiS2 nanostructures by an amino acid-modified polyol route. This work indicates that by changing the polyol process conditions including kind of capping agent, reaction time and reflux temperature, the sheet-like, cone-like, sphere-like and flower-like morphologies of AgBiS2 micro/nanostructures can be prepared. The phase, elemental composition, morphology and optical characteristics of as-prepared AgBiS2 nanostructures were analyzed by UV–Vis, FESEM, XRD, and EDS techniques. After characterization of the products, the AgBiS2 nanostructures were employed as novel photocatalysts for oxidative desulfurization of thiophene/n-octane solution as model fuel under visible light illumination. Results demonstrate that hierarchical flower-like AgBiS2 photocatalyst with desirable band gap energy (2.44 eV) has high photocatalytic desulfurization performance of about 89% after 2 h of visible light irradiation. As well as, the effects of morphology, photocatalyst dosage and reusability of the AgBiS2 nanostructures on the photocatalytic performance were evaluated. The excellent photocatalytic activity of AgBiS2 photocatalyst can be attributed to the strong visible light absorption, high separation rate of electron–hole pairs, special hierarchical structures and suitable band gap energy. Moreover, a reliable photo-oxidation desulfurization mechanism was discussed according to the active species trapping experiments, which revealed the photo-generated h+ and •O2− radicals were the main active species in the photocatalytic desulfurization process. تفاصيل المقالة -
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28 - The application of ZnO nanoparticles as a photocatalyst for wastewater treatment: A review
Mahdi Sanavi Fard Aref ShokriEver-increasing environmental pollutions and water scarcity are highly challenging issues that pose formidable obstacles to human beings on all fronts. Hetero-photocatalytic methods which utilized semiconductors as photocatalysts are highly promising and green technolog أکثرEver-increasing environmental pollutions and water scarcity are highly challenging issues that pose formidable obstacles to human beings on all fronts. Hetero-photocatalytic methods which utilized semiconductors as photocatalysts are highly promising and green technologies for the degradation of recalcitrant organic pollutants which cannot be completely removed by conventional treatment processes. In the view of the current scenario, zinc oxide nanostructures have been demonstrated to be predominant photocatalyst candidates for photodegradation because of their cost-effectiveness, non-toxicity, strong oxidation capability, flexibility in synthesizing, earth-abundance nature, easy crystallization, and high performance in the absorption over an extensive fraction of solar spectrum in comparison with titanium dioxide. Nevertheless, bare zinc oxide possesses several intrinsic limitations, like high recombination rate of the photogenerated charge carriers, limited solar light application, photo corrosion, broad bandgap and limited visible light absorption. Moreover, photocatalysts separation from remediated solutions restricts their large-scale applications. In this review paper, the authors briefly discussed basic principles of the zinc oxide photocatalytic process besides various modifications such as coupling with low bandgap semiconductors like metal and non-metal doping, synthesizing with graphene oxide, or reduced graphene oxide and their integration in magnetic materials to successfully addressing aforesaid disconcerting challenges. Moreover, hybridized photocatalytic and membrane systems are explored. Finally, challenges and future research directions are proposed for giving profound and well-defined insights toward reaching fully exploited zinc oxide-based nanoparticles in the field of water and wastewater treatments. تفاصيل المقالة -
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29 - Synthesis, characterization and photocatalytic activity of nanoZnO and Ni-Co-ZnO nanocomposites
Sara Poorarjmand Maryam Kargar Razi Ali Reza Mahjoub Morteza KhosraviPhotocatalysis has attracted significant attention as a potential issue for degradation of toxic organic pollutants such as Congo Red. In this research spherical Pure ZnO nano particles and Ni-Co-ZnO nano composites (Zn0.95Ni0.04Co0.01O, Zn0.95Ni0.025Co0.025O and Zn0. أکثرPhotocatalysis has attracted significant attention as a potential issue for degradation of toxic organic pollutants such as Congo Red. In this research spherical Pure ZnO nano particles and Ni-Co-ZnO nano composites (Zn0.95Ni0.04Co0.01O, Zn0.95Ni0.025Co0.025O and Zn0.95Ni0.01Co0.04O) have been synthesized by precipitation method. X- ray diffraction, Fourier transform Infra Red ,field emission scanning electron microscopy, EDX and ICP analysis confirmed the structure and composition of samples. The x-ray diffraction analysis (XRD) showed that all samples prepared were of Wurtzite structure and average crystal size of 17nm. Field emission scanning electron microscopy (FESEM) analysis revealed the spherical shape of all samples. The Fourier transform infrared spectroscopy (FT-IR) revealed bands at 435 cm-1, 480 cm-1 and 525 cm-1 are related to Zn-O bonds , related to the stretching vibrating bonds of ZnO. The results illustrated the Ni and Co ions substituted the Zn ions in ZnO crystal lattice successfully. The results showed that some of doped Ni-Co ZnO exhibit enhanced photocatalytic activity , as compared to pure ZnO. Kinetic of de-colorization process for all photo-catalysts followed psedu first order. In degradation process The best photocatlyst was (Zn0.95Ni0.04Co0.01O). تفاصيل المقالة -
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30 - Cr2O3 nanoparticles: Synthesis, characterization, optical, magnetic properties and photocatalytic degradation of methyl orange
Aliakbar Dehno Khalaji Pavel Machek Marketa JarosovaCr2O3 nanoparticles were synthesized via solid-state thermal decomposition of the mixture of Cr(NO3)3∙9H2O (as Cr precursor) and benzoic acid (as fuel) at 500 or 600 ºC for 3 h and characterized by FT IR and UV Vis spectroscopy, VSM, XRD and TEM. Also, characterize أکثرCr2O3 nanoparticles were synthesized via solid-state thermal decomposition of the mixture of Cr(NO3)3∙9H2O (as Cr precursor) and benzoic acid (as fuel) at 500 or 600 ºC for 3 h and characterized by FT IR and UV Vis spectroscopy, VSM, XRD and TEM. Also, characterized using zeta potential PZ measurement. FT IR and XRD results confirm high degree of crystallinity of Cr2O3 nanoparticles with ≈ 16-18 nm average crystallite size. The size distribution of the as prepared Cr2O3 nanoparticles is estimated to be in the range of 10-60 nm using TEM images. The morphology of the as prepared Cr2O3 nanoparticles is almost ellipsoidal or pseudo spherical. In addition, the photocatalytic degradation of methyl orange (MO) under UV light was studied. The effects of pH solution, sorbent dose and irradiation time were investigated. Based on changes in the UV-Vis spectra of MO, photocatalytic efficiencies were calculated about 91% and 89% for CeO2 nanoparticles prepared at 500 or 600 ºC, respectively. تفاصيل المقالة -
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31 - Degradation of Chloridazon in an aqueous environment using TiO2/Ag as a synthesized nano photocatalyst using central composite design
Maysam Abdolkarimi Fariba Soleimani Aref ShokriIn this study, TiO2/Ag nano photocatalyst was synthesized by sol-gel method and used for degradation of Chloridazon (CLZ) in aqueous media. The prepared catalyst was characterized using powder X-ray diffractometry (XRD), Fourier transform infra-red (FTIR), and field emi أکثرIn this study, TiO2/Ag nano photocatalyst was synthesized by sol-gel method and used for degradation of Chloridazon (CLZ) in aqueous media. The prepared catalyst was characterized using powder X-ray diffractometry (XRD), Fourier transform infra-red (FTIR), and field emission scanning electron microscopy (FESEM) techniques. The Crystallite size of pure TiO2 and Ag/TiO2 nanoparticles was 20 and 60 nm, respectively. The Central Composite Design (CCD) was employed for experimental design and statistical analysis of independent operational parameters. According to the results of Response Surface Methodology (RSM) plots of Design-Expert software, the optimal conditions for each critical variable were as the follows: time at 113 min, pH at 6.8, initial concentration of CLZ at 40 mg/l, and catalyst concentration at 0.83gr/l. The maximum effectiveness in the experimental and predicted CLZ removal was 94.2 and 93.5%, respectively. The outcomes of Analysis of variance (ANOVA) demonstrated high determination coefficient quantities (R2 = 0.9997, Predicted R2=0.9989, and Adjusted R2=0.9994) which validated the reliability of the second-order regression model. تفاصيل المقالة -
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32 - Sol-Gel Fabrication and Photocatalytic Properties of Indium Oxide-CNT Composite
Giang Li Lnfeng HuCarbon nanotube-In2O3 nanocomposites were synthesized by sol-gel method with the help of ultrasonic radiation. The samples were characterized by X-ray diffractometer, transmission electron microscopy and energy dispersive spectrometer. The UV absorbing properties were d أکثرCarbon nanotube-In2O3 nanocomposites were synthesized by sol-gel method with the help of ultrasonic radiation. The samples were characterized by X-ray diffractometer, transmission electron microscopy and energy dispersive spectrometer. The UV absorbing properties were detected by the UV spectrophotometer. Photo degradation of methylene blue in aqueous solution was investigated by using CNT/In2O3 nanocomposite as photocatalyst. The results showed that nanocomposites were composed of carbon nanotubes coated evenly by In2O3, with diameter of 50-60 nm. UV-visible spectrum indicated that the as-prepared CNT/In2O3 nanocomposite had absorption of visible light as well as ultraviolet light. 40 % carbon nanotube (molar radio of carbon nanotube to InCl3·4H2O) nanocomposite had the highest degradation rate for methylene blue under the sunlight irradiation. تفاصيل المقالة -
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33 - Photocatalytic degradation of Congo Red dye by using nano ZnO and Ni-Co-ZnO nanocomposites
Sara Poorarjmand Maryam Kargar Razi Ali Reza Mahjoob Morteza KhosraviPhotocatalysis has attracted significant attention as a potential issue for the degradation of toxic organic pollutants such as Congo Red. In this research spherical Pure ZnO nano particles and Ni-Co-ZnO nano composites (Zn0.95Ni0.04Co0.01O, Zn0.95Ni0.025Co0.025O and Zn أکثرPhotocatalysis has attracted significant attention as a potential issue for the degradation of toxic organic pollutants such as Congo Red. In this research spherical Pure ZnO nano particles and Ni-Co-ZnO nano composites (Zn0.95Ni0.04Co0.01O, Zn0.95Ni0.025Co0.025O and Zn0.95Ni0.01Co0.04O) have been synthesized by precipitation method. X- ray diffraction, Fourier transform Infra Red ,field emission scanning electron microscopy, EDX and ICP analysis confirmed the structure and composition of the samples. The x-ray diffraction analysis (XRD) showed that all samples prepared were about Wurtzite structure and average crystal size of 17nm. Field emission scanning electron microscopy (FESEM) analysis revealed the spherical shape of all samples. The Fourier transform infrared spectroscopy (FT-IR) revealed bands at 435 cm-1, 480 cm-1 and 525 cm-1 are related to Zn-O bonds, related to the stretching vibrating bonds of ZnO. The results illustrated the Ni and Co ions substituted the Zn ions in ZnO crystal lattice successfully. The results showed that some of doped Ni-Co ZnO exhibit enhanced photocatalytic activity , as compared to pure ZnO. Kinetic of de-colorization process for all photo-catalysts followed psedu first order. In degradation process The best photocatlyst was (Zn0.95Ni0.04Co0.01O). تفاصيل المقالة -
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34 - Improving photocatalytic properties of Zn0.95Ni0.04Co0.01O modified by PANI
Sara Poorarjmand Maryam Kargar Razi Ali Reza Mahjoub Morteza KhosraviIn this research, preparation of Zn0.95Ni0.04Co0.01O/PANI (polyaniline) (0.5%, 1% and 1.5% PANI) nano composites was performed by synthesis of pure polyaniline and adsorption of resulted organic chains on the structure of Zn0.95Ni0.04Co0.01O nano particles. The as-prepa أکثرIn this research, preparation of Zn0.95Ni0.04Co0.01O/PANI (polyaniline) (0.5%, 1% and 1.5% PANI) nano composites was performed by synthesis of pure polyaniline and adsorption of resulted organic chains on the structure of Zn0.95Ni0.04Co0.01O nano particles. The as-prepared samples was characterized by X-ray diffraction (XRD), fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM) and BET techniques. According to the X-ray diffraction analysis, pure PANI has a semi crystalline structure while all of the composites showed the characteristic peaks of Zn0.95Ni0.04Co0.01O with hexagonal wurtzite structure. The FTIR spectroscopy approved the interactions of PANI chains and Zn0.95Ni0.04Co0.01O nano particles. Field emission scanning electron microscopy analysis revealed amorphous structure of PANI and the spherical shape of nano composite. The BET analysis attributed the largest specific surface area of Zn0.95Ni0.04Co0.01O/PANI (1% PANI) nano composite. The photocatalytic results showed that the dye can be effectively decolorized by Zn0.95Ni0.04Co0.01O/PANI (1% PANI) nano composite. The enhancement of photocatalytic performance is due to the decrease of specific surface area and the higher separation efficiency of photo-induced electron-hole pairs. تفاصيل المقالة -
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35 - Efficient photocatalytic desulfurization of thiophene under visible light irradiation over flower-like AgBiS2 photocatalyst
Mehdi Mousavi-Kamazani Reza Rahmatolahzadeh Hassan NajafianHere, we report the production of hierarchical flower-like AgBiS2 nanostructuresby an amino acid-modified polyol route. This work indicates that by changing thepolyol process conditions including kind of capping agent, reaction time and refluxtemperature, the sheet-like أکثرHere, we report the production of hierarchical flower-like AgBiS2 nanostructuresby an amino acid-modified polyol route. This work indicates that by changing thepolyol process conditions including kind of capping agent, reaction time and refluxtemperature, the sheet-like, cone-like, sphere-like and flower-like morphologies ofAgBiS2 micro/nanostructures can be prepared. The phase, elemental composition,morphology and optical characteristics of as-prepared AgBiS2 nanostructures wereanalyzed by UV–Vis, FESEM, XRD, and EDS techniques. After characterization ofthe products, the AgBiS2 nanostructures were employed as novel photocatalystsfor oxidative desulfurization of thiophene/n-octane solution as model fuel undervisible light illumination. Results demonstrate that hierarchical flower-like AgBiS2photocatalyst with desirable band gap energy (2.44 eV) has high photocatalyticdesulfurization performance of about 89% after 2 h of visible light irradiation.As well as, the effects of morphology, photocatalyst dosage and reusability ofthe AgBiS2 nanostructures on the photocatalytic performance were evaluated.The excellent photocatalytic activity of AgBiS2 photocatalyst can be attributedto the strong visible light absorption, high separation rate of electron–hole pairs,special hierarchical structures and suitable band gap energy. Moreover, a reliablephoto-oxidation desulfurization mechanism was discussed according to theactive species trapping experiments, which revealed the photo-generated h+ and•O2− radicals were the main active species in the photocatalytic desulfurizationprocess. تفاصيل المقالة -
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36 - Photocatalytic degradation of rhodamine B by nano bismuth oxide: Process modeling by response surface methodology (RSM)
Seyed Ali Hosseini Ramin SaeediThe photocatalytic activity of nano-Bi2O3 was evaluated in degradation of rhodamine B (RhB) as a model of dye pollutant from waste waters. Nano sized Bi2O3 was synthesized using the chemical precipitation method. The as-prepared sample was characterized by X-ray diffrac أکثرThe photocatalytic activity of nano-Bi2O3 was evaluated in degradation of rhodamine B (RhB) as a model of dye pollutant from waste waters. Nano sized Bi2O3 was synthesized using the chemical precipitation method. The as-prepared sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FT-IR). Structural analysis revealed that Bi2O3 contains a unique well-crystallized phase and the average crystallite size of 22.4 nm. The SEM analysis revealed that the size of Bi2O3 particles was mainly in the range of 16-22 nm. Response surface methodology was applied to design experiments and to optimize the photocatalytic process. A second order model was developed and a good correlation was found between experimental and predicted responses, confirming the reliability of the model. The optimal condition for maximum degradation of values of RhB resulted in initial concentration, irradiation time, initial pH and catalyst dosage of 12.5 mg.L-1, 120 min, 4.6-7 and 0. 75 g.L-1, respectively. The Bi2O3 nanoparticles exhibited an efficient ultraviolet photocatalytic activity so that under optimal condition more than 95% of Rhodamine B was decolorized. The Pareto analysis indicated that the order of relative importance of the input variables on the dye degradation efficiency is as follows: Bi2O3 dosage > pH ≈ irradiation time >initial concentration of the RhB. تفاصيل المقالة -
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37 - The Study of Photocatalytic Degradation Mechanism under Visible Light Irradiation on BiOBr/Ag Nanocomposite
Marzieh Yaghoubi-berijani bahram bahramian Solmaz ZargariDue to the pollution of dyeing and textile industry wastewaters in different colors and the need to remove these pollutants from the wastewaters, it is necessary to study and develop effective and efficient technology solutions required. To remove dye from aqueous solut أکثرDue to the pollution of dyeing and textile industry wastewaters in different colors and the need to remove these pollutants from the wastewaters, it is necessary to study and develop effective and efficient technology solutions required. To remove dye from aqueous solutions, photodegradation is employed as an effectively simple way. Thus, the BiOBr photocatalyst was chemically made by synthesis using a facile method. To enhance its photocatalytic activity, the synthesized BiOBr nanoplates were then functionalized with Ag NPs forming the modified BiOBr/Ag photocatalyst. The BiOBr/Ag nanocomposite was synthesized with different percentages of Ag to determine its optimized percentage in the photocatalytic process. The characterization techniques of PL, DRS, XRD, EDX, SEM, FT-IR, and Raman were used to confirm the prepared samples. The power-down white light lamp was used in the photocatalytic process, which showed good degradation. The photocatalytic activity of prepared BiOBr/Ag was investigated by the degradation of the 2,4-dichlorophenol, methyl orange, and rhodamine B. The effective separation and inhibited recombination of photo-generated electron-hole pairs resulted from the high photocatalytic activity. تفاصيل المقالة -
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38 - Enhanced photocatalytic activity of sonochemical derived ZnO via the co-doping process
Maryam Bordbar Solmaz Forghani-pilerood Ali Yeganeh-FaalIn the present study, Co-ZnO and Co-Ni-ZnO nanoparticles were synthesized by sonochemical methods and the structural and optical properties were investigated through Fourier Transform Infrared spectroscopy (FTIR), UV-Vis spectroscopy, Field Emission Scanning Electron Mi أکثرIn the present study, Co-ZnO and Co-Ni-ZnO nanoparticles were synthesized by sonochemical methods and the structural and optical properties were investigated through Fourier Transform Infrared spectroscopy (FTIR), UV-Vis spectroscopy, Field Emission Scanning Electron Microscopy (FE-SEM), X-Ray Diffraction (XRD), and Photoluminescence spectroscopy (PL) methods. Morphology of nanoparticles obtained a small granular shape with an average crystallite size of 60 nm. In addition, the direct band gap was calculated using Tauc's approach. Comparing with pure ZnO, the band gap of the doped-ZnO NPs is smaller and depends on the type of dopants. Moreover, photocatalytic activity of all samples was investigated by the degradation of methyl orange (MO) dye under UV irradiation in an aqueous medium. Co-Ni-ZnO possesses excellent photocatalytic activity for the degradation of MO when compared to Co-ZnO and ZnO. In addition, the photocatalytic activity of Co-ZnO improves in the presence of nickel dopant. Moreover, the photocatalyst could be reused for four times without remarkable loss of its activity. تفاصيل المقالة -
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39 - Synthesis of zinc oxide nanoparticle by zinc acetate precursor and study on its catalytic properties
Azar Bagheri GhomiZnO nanoparticles have been prepared by a simple method in a short period of time. In this synthetic method, the sample was obtained using Zn(CH3COO)2·2H2O and a new template of hexamine salt. Their crystalline structure and morphology were studied by XRD and SEM أکثرZnO nanoparticles have been prepared by a simple method in a short period of time. In this synthetic method, the sample was obtained using Zn(CH3COO)2·2H2O and a new template of hexamine salt. Their crystalline structure and morphology were studied by XRD and SEM. The optical properties of the sample were studied by UV–visible spectroscopy. The absorption spectrum of ZnO shows that the optical band gap is 3.02 eV. In this investigation, the photocatalytic degradation of Indigo carmine(IC) in water was studied. The degradation rate is reduced as a function of increase in the initial concentration of IC. The effects of some parameters such as pH and initial concentration of dye were examined. تفاصيل المقالة -
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40 - Photocatalytic degradation of phenylephrine hydrochloride in aqueous solutions by synthesized SnO2-doped ZnO nanophotocatalyst
Masoud Giahi Akram Hoseinpour DargahiZnO and SnO2-doped ZnO nanoparticles were prepared by a sol–gel method for the first time. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the ZnO and SnO2-doped ZnO samples. Advanced oxidation processes (AOPs) have proved أکثرZnO and SnO2-doped ZnO nanoparticles were prepared by a sol–gel method for the first time. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the ZnO and SnO2-doped ZnO samples. Advanced oxidation processes (AOPs) have proved very effective in treatment of the various hazardous organic pollutants such as surfactants and pharmaceuticals in water. The photocatalytic degradation of drug phenylephrine hydrochloride (PHE) was studied as model organic pollutant. Under UV exposure the process was investigated with ZnO and SnO2-doped ZnO. The degradation was studied under different conditions including irradiation time, pH, catalyst concentration, phenylephrine hydrochloride concentration and potassium peroxydisulfate as an oxidant. The experimental results indicated that maximum degradation (99.4±1.0%) of drug occurred with SnO2-doped ZnO catalyst. The results demonstrated that photodegradation efficiency of SnO2-doped ZnO was significantly higher than that of undoped ZnO. تفاصيل المقالة -
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41 - Photocatalytic degradation of ciprofloxacin in the presence of synthesized ZnO nanocatalyst: The effect of operational parameters
Solmaz Aghdasi Mohammad ShokriThis study was aimed at investigating the photocatalytic degradation of ciprofloxacin (CIP) antibiotic in aqueous solution using immobilized ZnO nanoparticles on glass plate. X-ray diffraction, atomic force microscopy, and scanning electron microscopy were applied to ch أکثرThis study was aimed at investigating the photocatalytic degradation of ciprofloxacin (CIP) antibiotic in aqueous solution using immobilized ZnO nanoparticles on glass plate. X-ray diffraction, atomic force microscopy, and scanning electron microscopy were applied to characterize the nanoparticles. To do so, the ZnO nanoparticles were synthesized through the chemical precipitation method and were immobilized on a glass plate. The degradation of CIP was under UV-C light irradiation. The effects of operational parameters (initial concentration of CIP, pH, and light intensity) on the activity of synthesized ZnO photocatalyst and the kinetics of reaction were investigated. With the initial concentration of 10 mg L-1 of CIP, pH = 6.8 and light intensity = 42 W m-2, the photodegradation efficiency was found to be 69.5%. The results showed that the reaction followed a pseudo-first-order kinetic. The results of the mineralization studies also represented a decreasing trend of total organic carbon over time. تفاصيل المقالة -
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42 - Experimental design study of RB 255 photocatalytic degradation under visible light using synthetic Ag/TiO2 nanoparticles: Optimization of experimental conditions
Narges Elmi Fard Reza FazaeliIn the present study, silver-doped TiO2 (Ag/TiO2) nanoparticles were prepared by various Ag doping (wt%) and a combination of sol-gel and ultrasound irradiation. Ag/TiO2 nanoparticles were characterized by energy-dispersive X-ray analysis (EDX), scanning electron micros أکثرIn the present study, silver-doped TiO2 (Ag/TiO2) nanoparticles were prepared by various Ag doping (wt%) and a combination of sol-gel and ultrasound irradiation. Ag/TiO2 nanoparticles were characterized by energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. Based on the Taguchi method, photocatalytic degradation of (Reactive Blue 255) RB 255 azo dye was examined with Ag/TiO2 nanoparticles under visible light irradiation. Using this method, operation factors such as Ag doping (wt%), pH, mass of catalyst (g) and RB 255 concentration (ppm) were optimized successfully. The results showed that pH, compared to the other factors, plays an important role in the photocatalytic degradation of RB 255 azo dye. The isotherm study Weber-Van Vliet and Fritz-Schlunder (IV) models are the best descriptors of equilibrium behavior. In addition, the kinetic study results indicated that the pseudo first-order has a good agreement with the experimental data. تفاصيل المقالة -
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43 - Effects of metal oxide catalysts on the photodegradation of antibiotics effluent
Chaimaa EL Bekkali Habiba Bouyarmane Said Laasri Abdelaziz Laghzizil Ahmed SaoiabiThe current study examined the effect of metal oxide catalysts on the sorption and photocatalytic efficiencies for the removal of ciprofloxacin and ofloxacin in water. ZnO and TiO2 catalysts are prepared using a suitable method based on the sol-gel process, which have a أکثرThe current study examined the effect of metal oxide catalysts on the sorption and photocatalytic efficiencies for the removal of ciprofloxacin and ofloxacin in water. ZnO and TiO2 catalysts are prepared using a suitable method based on the sol-gel process, which have a great change in structural and textural properties. The structure and surface area of the synthesized catalysts were characterized, and used as sorbents/catalysts to remove antibiotics from water. Results showed a high adsorption capacity for the Titania oxide related to its great surface area, it is about 280 m2 g-1, compared to that of ZnO catalyst with only 19 m2 g-1. However, both photocatalysts exhibit a difference in photocatalytic activity versus both drugs. Therefore, ZnO, as a competitor catalyst for the TiO2, provides the most effective treatment of contaminated water with antibiotic pollutants to produce suitable reused water. تفاصيل المقالة -
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44 - Photocatalytic self-cleaning properties of lanthanum and silver co-doped TiO2 nanocomposite on polymeric fibers
Hadi Fallah MoafiTitania, single-doped and lanthanum-silver co-doped titania nanocomposite were coated on cellulosic and polyacrylonitrile fibers via sol–gel method. The prepared samples were evaluated using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispe أکثرTitania, single-doped and lanthanum-silver co-doped titania nanocomposite were coated on cellulosic and polyacrylonitrile fibers via sol–gel method. The prepared samples were evaluated using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL) and BET surface area measurement. The photo self-cleaning activity of the nanocomposites coated-fibers were determined by degradation of methylene blue and eosin yellowish under UV-Vis light. Diffuse reflectance spectroscopy was used to monitor photodegradation of dyes. The results of EDX and XPS revealed that La and Ag was doped into TiO2 structure. The results of EDX, TEM and BET analyses indicated that the TiO2 and TiO2 nanocomposite coatings were composed of nanoparticles or aggregates with a size of less than 20 nm. All samples demonstrated photocatalytic self-cleaning properties when exposed to UV-Vis irradiation. The results showed that the La3+/Ag+ co-doping is more beneficial than single doping of TiO2 coating and the synergistic effect of La3+ and Ag+ is responsible for improving the photo-activity. This may be ascribed to the microstructure of TiO2 and the effect of the doping modes on the structural and electronic properties of the anatase phase. تفاصيل المقالة -
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45 - Reflux condensation synthesis and characterization of Co3O4 nanoparticles for photocatalytic applications
M. Mohamed Jaffer Sadiq A. Samson NesarajIn this research work, we report a simple method called reflux condensation method for synthesizing Co3O4 nanoparticles using cheap chemicals such as, cobalt acetate (precursor salt), sodium monododecyl sulphate - SDS (surfactant) and N, N - Dimethylformamide - DMF (sol أکثرIn this research work, we report a simple method called reflux condensation method for synthesizing Co3O4 nanoparticles using cheap chemicals such as, cobalt acetate (precursor salt), sodium monododecyl sulphate - SDS (surfactant) and N, N - Dimethylformamide - DMF (solvent). The prepared materials were heat treated at 200, 400, 600 and 800 oC for each 2 h to get phase pure product. The calcined nanoparticles were characterized by XRD, EDAX, FTIR Spectroscopy, Particle Size Analysis, SEM, UV-Vis Spectroscopy (UV) and Photo Luminescence (PL) Spectroscopy techniques. The XRD data confirmed the presence of crystallization of Co3O4 nanoparticles as face-centered cubic (Fd3m) structure. The appearance of Co-O stretching vibration mode and bridging vibration of O-Co-O bond in the samples found out by FTIR spectroscopy. The particlulate and microstructural studies revealed the occurrence of nanoparticles in the samples. The atomic percentages of Co and O were found to be 42% and 58% in the sample. This energy band gap for the sample is found to be 5.6 eV. Photocatalytic degradation characteristics of methyl orange and Rhodamine B using Co3O4 nanoparticles were studied and reported. Among the two dye samples studied, methyl orange was found to be degraded effectively (76%) with Co3O4 nanoparticles in presence of UV-light after two hours of irradiation. تفاصيل المقالة -
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46 - Incorporation of Pb2+, Fe2+ and Cd2+ ions in ZnO nanocatalyst for photocatalytic activity
Maryam Bordbar Zahra Sayban Ali Yeganeh-Faal Bahar KhodadadiIn the present study, Pb-ZnO, Fe-ZnO, Cd-ZnO and Pb-Fe-Cd-ZnO nanoparticles were synthesized by the sonochemical method and those structural and optical properties were investigated by Fourier Transform Infrared spectroscopy (FTIR), UV-Vis spectroscopy, Field Emission S أکثرIn the present study, Pb-ZnO, Fe-ZnO, Cd-ZnO and Pb-Fe-Cd-ZnO nanoparticles were synthesized by the sonochemical method and those structural and optical properties were investigated by Fourier Transform Infrared spectroscopy (FTIR), UV-Vis spectroscopy, Field Emission Scanning Electron Microscopy (FE-SEM) and X-Ray Diffraction (XRD). Average crystallite size obtained was 60 nm. Moreover, the direct band gap has been calculated using Tauc's approach. Compared with pure ZnO, the band gap of the doped-ZnO NPs is smaller and it depends on the type of dopants. In addition, photocatalytic activity of all samples has been investigated by the degradation of congo red (CR) dye under UV irradiation in an aqueous medium. In the presence of ZnO NPs photocatalytic degradation of 35% was obtained for 180 min. But Pb-ZnO, Fe-ZnO, Cd-ZnO and Pb-Fe-Cd-ZnO have shown the degradation of 45, 57, 65 and 80% respectively; they have the faster decolorization as compared with the ZnO NPs. Moreover, the photocatalyst could be reused for five times without remarkable loss of its activity. تفاصيل المقالة -
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47 - Photocatalytic degradation of methyl orange using ZnO and Fe doped ZnO: A comparative study
Kalpesh Anil Isai Vinod Shankar ShrivatavaZnO and 2% Fe doped ZnO photocatalytic nanomaterials were successfully synthesized by successive ionic layer adsorption and the reaction (SILAR) method. The characterizations of these nanomaterials were carried out using XRD, SEM and EDX techniques. XRD study shows that أکثرZnO and 2% Fe doped ZnO photocatalytic nanomaterials were successfully synthesized by successive ionic layer adsorption and the reaction (SILAR) method. The characterizations of these nanomaterials were carried out using XRD, SEM and EDX techniques. XRD study shows that the samples have a hexagonal wurtzite crystalstructure, size of which is in the range 21-23 nm. SEM shows nanoflakes or nano flower-like morphology, while EDX reveals the compositional analysis. In this paper, we investigated photocatalytic degradation of an aqueous suspension of methyl orange (MO) dye as a model pollutant. Degradation of dye was monitored by the spectrophotometric method. The effects of various parameters such as pH, contact time, initial dye concentration and catalyst dose were studied. in optimized process, the maximum degradation obtained using ZnO was 88 % and that using Fe doped ZnO was 94 % at a pH value of 8. We have concluded that, compared to ZnO, the 2% Fe doped ZnO is a promising photocatalyst for degradation of MO. تفاصيل المقالة -
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48 - Preparation of ZnO nanocatalyst supported on todorokite and photocatalytic efficiency in the reduction of chromium (VI) pollutant from aqueous solution
Maryam Sabonian Kazem MahanpoorIn this research, a new effective photocatalyst was prepared by supporting ZnO on a Todorokite (TD). This catalyst was characterized by employing scanning electron microscopy (SEM-EDX) and X-Ray Diffraction (XRD) patterns. The optical properties of the samples were meas أکثرIn this research, a new effective photocatalyst was prepared by supporting ZnO on a Todorokite (TD). This catalyst was characterized by employing scanning electron microscopy (SEM-EDX) and X-Ray Diffraction (XRD) patterns. The optical properties of the samples were measured by diffuse reflectance spectroscopy (DRS). The purpose of using the ZnO/TD as a photocatalyst was to reduction Cr(VI), which is a pollutant in water. Experiments were carried out under different operating conditions including an initial concentration of Cr(VI), photocatalyst amounts and pH values. To optimize processes and obtain a mathematical model, the researcher used a full factorial design (with three factors at three levels). The optimal conditions were determined where the amount of photocatalyst= 200 mg L-1, pH= 2 and concentration of Cr(VI)= 15 ppm. The reduction efficiency in an optimal condition was 97.73%. The experimental results showed that kinetic was the first order and k= 0.1489 min–1. تفاصيل المقالة -
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49 - Enhancement of photocatalytic degradation of 4-nitrophenol by integrating Ag nanoparticles with ZnO/HZSM-5 nanocomposite
Baharak Divband Azadeh Jodaei Masumeh KhatamianIn this paper, Ag/ZnO/HZSM-5ternary nanocomposites with different Ag loadings were prepared by the photo precipitation method. The prepared photocatalysts were characterized by XRD, BET, SEM and TEM. The photocatalytic activity of ZnO/HZSM-5 for 4-nitrophenol (4-NP) deg أکثرIn this paper, Ag/ZnO/HZSM-5ternary nanocomposites with different Ag loadings were prepared by the photo precipitation method. The prepared photocatalysts were characterized by XRD, BET, SEM and TEM. The photocatalytic activity of ZnO/HZSM-5 for 4-nitrophenol (4-NP) degradation was increased by silver doping. Effects of various parameters such as the initial concentration of 4-NP, pH and Ag loading on 4-NP degradation were studied. The best activities were obtained for the 3% Ag-10% ZnO/HZSM-5 nanocatalysts at pH 7.9, 1 g L−1 of the catalyst and 5 ppm of 4-NP. Langmuir–Hinshelwood (L–H) model was proposed for the rate equation of the 4-NP degradation. تفاصيل المقالة -
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50 - Synthesis of Fe-doped TiO2 with improved photocatalytic properties under Vis-L irradiation
Imane Ellouzi Boutaina Regraguy Souad El hajjaji Mourad Harir Philippe Schmitt-Kopplin Hinda Lachheb Larbi LaânabFe-doped TiO2 nanoparticles were successfully synthesized by the coprecipitation method. TiO2 was doped with a different molar ratio of iron amounts, namely 0.1% and 0.2%. An undoped TiO2 was also prepared for comparison. X-ray diffraction (XRD), transmission electron m أکثرFe-doped TiO2 nanoparticles were successfully synthesized by the coprecipitation method. TiO2 was doped with a different molar ratio of iron amounts, namely 0.1% and 0.2%. An undoped TiO2 was also prepared for comparison. X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-visible diffuse reflectance spectroscopy techniques were used to characterize the as-synthesized nanoparticles. The XRD spectra revealed that the photocatalysts were mostly in a well-crystallized anatase phase. Optical properties of the powders shifted from UV to the beginning of the visible light (Vis-L) region. Absorption edge wavelengths between 392 and 380 nm were obtained for the Fe-doped TiO2 and TiO2-P25, corresponding to band gap energies between 3.17 and 3.26 eV. TEM images showed homogeneity with a certain degree of agglomeration for all the samples. The photocatalytic efficiency of the as-synthesized Fe-doped TiO2 nanoparticles was performed using azo dye methyl orange (MO) in an aqueous solution under Vis-L irradiation. The photocatalytic results showed that Fe-doped TiO2 nanoparticles effectively degrade MO under Vis-L excitation and follow pseudo-first order kinetics. Besides, kinetic comparison showed that pure TiO2 is less efficient than 0.1% and 0.2% Fe-doped TiO2 because they exhibit unequaled efficiency. Moreover, the photocatalyst at 0.2% Fe-doped TiO2 molar ratio revealed the highest photocatalytic efficiency, which was 4.2 times higher compared to pure TiO2. Different amounts of Fe induced different increases in the apparent first-order rate constant of the photocatalytic process. تفاصيل المقالة -
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51 - Cuprous oxide nanocubes functionalized with graphene quantum dots and its application for methylene blue degradation
Quyen Tran Dang Pham My Ngo Toan Pham Thien Doan Thanh LuongCuprous oxide nanocubes (Cu2O NCBs) were successfully functionalized with graphene quantum dots (GQDs) to form GQDs/Cu2O NCBs composites material with highly plasmonic property and photocatalytic activity. Herein, GQDs were synthesized by a hydrothermal method at 190&de أکثرCuprous oxide nanocubes (Cu2O NCBs) were successfully functionalized with graphene quantum dots (GQDs) to form GQDs/Cu2O NCBs composites material with highly plasmonic property and photocatalytic activity. Herein, GQDs were synthesized by a hydrothermal method at 190°C for 8 h using natural sources of wheat flour and ascorbic acid as precursors and reducing agents, respectively. Cu2O NCBs were prepared via a simple chemical reduction method at room temperature. GQDs/Cu2O NCBs composites were fabricated by the simple mixing of the two corresponding component dispersions. Characterized by ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD),transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX), the GQDs/Cu2O NCBs structures were confirmed. The composites possessed cubic shape of Cu2O and spherical shape of GQDs with average particle sizes respectively being ~70-80 nm, and ~3-8 nm; and an elemental composition of C (41.53%), O (47.03%), N (0.24%), and Cu (11.20%). Moreover, experiments on the methylene blue (MB) degradation demonstrated that the GQDs/Cu2O NCBs composites significantly degraded >98% of the total dye amount within 30 min. In summary, the novel composites possessed potential high catalytic activity and could be utilized as photocatalysts in the treatment of organic pollutants and biological waste such as dyes, antibiotics, and pesticides. تفاصيل المقالة -
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52 - Transition-metal modified mesoporous silica nanoparticles as highly effective heterogeneous catalysts for discoloration of Basic red 5 in aqueous solution
Fatemeh Mahfoozi Ali Mahmoudi Mohammad Reza Sazegar Khodadad NazariMesoporous silica nanoparticles (MSNs) were synthesized hydrothermally and modified with Co2+ and Zn2+. The as-prepared samples were denoted as MSN, Co-MSN(X), and Zn-MSN(X), where X is the Si/M molar ratio. In addition, co-modified MSN samples with both cations were al أکثرMesoporous silica nanoparticles (MSNs) were synthesized hydrothermally and modified with Co2+ and Zn2+. The as-prepared samples were denoted as MSN, Co-MSN(X), and Zn-MSN(X), where X is the Si/M molar ratio. In addition, co-modified MSN samples with both cations were also prepared and denoted as Co-Zn(Y)-MSN(X), where Y indicates the Zn2+ content in the range of 1-7 wt.% relative to Co2+. Correctness of the anticipated structures was approved by FTIR, XRD, SEM, EDX, BET, and XRF analyses. It was found that Co-Zn(7)-MSN(75) can be used as an efficient photocatalyst for discoloration of basic red 5 under very mild conditions. Up to 86% of basic red 5 was discolored after 3.75 h under the optimized conditions including catalyst dosage of 0.025 mg mL-1, pH=7, and irradiation of 4×8 W UV (254 nm) lamps. By using the Langmuir–Hinshelwood kinetics model, it was found that the reaction followed a pseudo-first-order kinetic. تفاصيل المقالة -
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53 - Investigation on the Photocatalytic and Antibacterial Activities of Green synthesized Cupric Oxide Nanoparticles using Clitoria ternatea
S. Prabhu T. Daniel Thangadurai P. Vijai Bharathy Pon. KalugasalamGreen synthesis of cupric oxide nanoparticles (CuO NPs) has been promoted as an environmentally-friendly, cost-effective and high yield method. The CuO NPs have been synthesized by reducing copper sulphate using an aqueous flower extract of Clitoria ternatea. The UV-vis أکثرGreen synthesis of cupric oxide nanoparticles (CuO NPs) has been promoted as an environmentally-friendly, cost-effective and high yield method. The CuO NPs have been synthesized by reducing copper sulphate using an aqueous flower extract of Clitoria ternatea. The UV-visible peak observed at 251 nm confirmed the formation of CuO NPs. The optical bandgap energy value of CuO NPs was found to be 2.16 eV. The presence of Cu-O band at 490 cm−1 in the FTIR spectrum confirms the formation of the CuO NPs. The XRD exhibits monoclinic structure with an average crystallite size of 17.46 nm. The negative zeta potential value (-17.7 mV) demonstrated the stability of CuO NPs. The formation of agglomerated and roughly spherical NPS was shown by FESEM images. As seen in the HRTEM images, the nanostructure appears to be aggregated CuO NPs, and the average size of the particle was found to be 18 nm that matched with the XRD analysis. The EDX analysis showed presence of Cu (96.19%) and O (3.81%) in the spectrum. The CuO NPs exhibit significant antibacterial activity against Gram +Ve Staphylococcus aureus and Gram –Ve Escherichia coli bacteria. Finally, the synthesized CuO nanostructures demonstrate the photocatalytic degradation of Direct Red (DR) and Crystal Violet (CV) dyes under sunlight. The efficiency of degradation within 150 min was determined to be 65% and 88.3%, respectively for DR and CV. This effective removal method under sunlight may support a cost-effective method for degradation of DR and CV dyes from wastewater. تفاصيل المقالة -
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54 - CMCFO-Cr0.1 Nanoferrites: Sol-gel Synthesis, Structural, and Magnetic Studies: Applications for Photodegradation of Congo Red Dye
Ahmed Selmi Hakimeh Teymourinia Armin Zarei Mohamed Timoumi Ali RamazaniOne of the foremost inescapable impediments that industrial sectors face is to remove organic pollutants, which affected nature and threatened the existence of species per se. Nanoscale magnetic ferrites are considerable materials for removing the majority of organic dy أکثرOne of the foremost inescapable impediments that industrial sectors face is to remove organic pollutants, which affected nature and threatened the existence of species per se. Nanoscale magnetic ferrites are considerable materials for removing the majority of organic dyes due to their unique properties and high potential photocatalytic activity. Their photocatalytic performance in semiconductor nanocrystals has also received many enthusiasts over the last couple of years. Changing nanoferrites’ architectural building blocks and increasing their bandgap energy may improve their photocatalytic peculiarities. In the present investigation, we have studied nanoscale magnetic ferrites with Co0.4Mg0.4Cu0.2Fe1.9Cr0.1O4, (CMCFO-Crx, x= 0.1) formula. CMCFO-Crx has synthesized via sol- gel approach. The synthesized nanoparticles were characterized by XRD, SEM, UV-vis analysis, and magnetic measurement, revealing the cubic spinel structure with space group Fd-3m (N° 277), average size between 20 and 60 nm, higher bandgap energy and saturation magnetization (446 emu/g) in the presence of transition metals. The results demonstrated in CMCFO-Crx (x=0.1) compound, the Curie temperature decreases to 446 K by the substitution of Fe3+ by Cr3+ ions. The synthesized powder nanoferrites efficiently degraded the Congo Red (CR) dye (84 %) under UV irradiation, for which the most probable degradation pathway is proposed. The recyclability test exhibited the nanoscale magnetic ferrites catalysts are sensibly efficient, stable, and facile recoverable by an external magnet. Thus, the CMCFO-Crx compounds can be an applicable catalyst in wastewater treatment. تفاصيل المقالة -
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55 - The most important parameters that affect the photocatalytic activity of ZnO nanostructures against organic dyes: A Review
Marwa Jawad Kadhim Mazin Auny Mahdi Abbas Mohammed Selman Salwan Kamal Jamel Al-Ani Jalal Jabar Hassan Naser Mohammed AhmedOrganic dyes are among the main sources of water pollution that cause serious health problems for living organisms. Removing dye pollution from water sources is important because of its high toxicity, so it has attracted the interest of researchers. Heterogeneous photoc أکثرOrganic dyes are among the main sources of water pollution that cause serious health problems for living organisms. Removing dye pollution from water sources is important because of its high toxicity, so it has attracted the interest of researchers. Heterogeneous photocatalysis based on ZnO is one of the most important methods of pollution treatment. The purpose of this review is to summarize the use of ZnO nanostructure and ZnO modified as photocatalysts.The studied mechanism of dye photocatalytic activity and the most important factors affecting the photocatalytic process are discussed. The major effective parameters associated with the surface and morphology to look upon for the efficient photodegradation of organic pollution are structural and average particle size, surface area, band gap crystalline structure, surface density, and porosity. The photodegradation reactions depend on the state of ionization as well as on the surface charge of the photocatalyst and organic dye because pH will determine the charge of the catalyst according to the medium. On the other hand, the calcination temperature was increased throughout the work to break down the pores, which reduces the surface area of the synthesis photocatalyst. The type of dye has an important influence on the success of the photocatalytic process. تفاصيل المقالة -
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56 - Photocatalytic degradation of an azo textile dye with manganese-doped ZnO nanoparticles coated on glass
Mohammad Habibi Elham AskariMn doped ZnO nanocomposite thin film coated on glass by a simple spin-coating method was used to degrade an azo textile dye from aqueous environment. Mn doped ZnO nanocomposite thin film was characterized by means of X-ray diffraction (XRD) and scanning electron microsc أکثرMn doped ZnO nanocomposite thin film coated on glass by a simple spin-coating method was used to degrade an azo textile dye from aqueous environment. Mn doped ZnO nanocomposite thin film was characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photo-reduction activity of photocatalyst was evaluated using an azo textile dye as organic contaminant irradiated only with UV light from mercury bulb. The processing parameter such as the pH value also played an important role in tuning the photocatalytic activity. The maximum photodecomposition rate was achieved at pH=6, and a novel model about the absorption of azo dye on the surface of the catalysts was proposed. تفاصيل المقالة -
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57 - نانوچندسازه منیزیم فریت/گرافن اکسید کاهیده و کاربرد فتوکاتالیستی آن در تخریب آلاینده و تولید سوخت
مجید غنیمتی محسن لشگری واسیلیوس بیناستهیه مواد نانوچندسازه کارآمد با استفاده از عناصر فراوان زمین و ترکیب های دوستدار محیط زیست و کاربرد آن ها با هدف تخریب نور کاتالیستی مواد خطرناک و تولید سوخت، یک راهبرد پایدار برای حذف آلاینده و تامین هیدروژن به عنوان سوخت سبز (فاقد کربن) در دنیای مدرن است. در این پ أکثرتهیه مواد نانوچندسازه کارآمد با استفاده از عناصر فراوان زمین و ترکیب های دوستدار محیط زیست و کاربرد آن ها با هدف تخریب نور کاتالیستی مواد خطرناک و تولید سوخت، یک راهبرد پایدار برای حذف آلاینده و تامین هیدروژن به عنوان سوخت سبز (فاقد کربن) در دنیای مدرن است. در این پژوهش، نیم رسانای نانوساختار منیزیم فریت (MgFe2O4) سنتز و برای تولید گاز هیدروژن از راه شکافت نوری محلول قلیایی سیر شده از H2S و تخریب فتوکاتالیستی آلاینده مقاوم رنگ آزو (متیل اورانژ) استفاده شد. بررسی ها مشخص کرد فتوکاتالیست سنتزی، از توانایی لازم برای تخریب آلاینده و تولید هیدروژن برخوردار است. برای بهبود فعالیت فتوکاتالیست، پیش ساز گرافن اکسید به روش هامرز اصلاح شده تهیه و از آن به شکل مستقیم در سنتز آب گرمایی نانوچندسازه منیزیم فریت/گرافن اکسید کاهیده استفاده شد. شواهد نشان داد وجود گرافن اکسید کاهیده و تشکیل نانوچندسازه قادر است توانایی رنگ زدایی و تولید هیدروژن را از راه افزایش مساحت سطح فتوکاتالیست، کاهش بازترکیب الکترون-حفره و تقویت جذب فوتون، به مقدار قابل توجهی افزایش دهد. بازده تخریب پس از یک ساعت کار فتوواکنشگاه برابر با 84 درصد و سرعت آزادسازی هیدروژن برابر با 5567 میکرومول بر ساعت بر گرم فتوکاتالیست به دست آمد که بیانگر عملکرد خوب فتوکاتالیست نانوچندسازه برای حذف آلاینده و تولید سوخت است. تفاصيل المقالة -
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58 - تهیه و شناسایی نانوچندسازه کربن نیترید گرافیتی/کائولن برای حذف فوتوکاتالیستی نیترات از محلولهای آبی
الهام اسدی محمد هادی قاسمی پرویز احمدی اول ناهید منجمی مریم افشارپور مجید بغدادییون نیترات موجود در آب موجب مسمومیت انسان میشود و بسیار خطرناک است. حذف فوتوکاتالیستی نیترات از آب و تبدیل آن به گاز نیتروژن از اهمیت زیادی برخوردار است. در این مطالعه، نانوچندسازه ناهمگن کربن نیترید گرافیتی/کائولن به دلیل داشتن بستر طبیعی کائولن با خواص ویژه، برای کاه أکثریون نیترات موجود در آب موجب مسمومیت انسان میشود و بسیار خطرناک است. حذف فوتوکاتالیستی نیترات از آب و تبدیل آن به گاز نیتروژن از اهمیت زیادی برخوردار است. در این مطالعه، نانوچندسازه ناهمگن کربن نیترید گرافیتی/کائولن به دلیل داشتن بستر طبیعی کائولن با خواص ویژه، برای کاهش نیترات تحت تابش پرتو فرابنفش درنظرگرفته‎شد. نتیجه های به‎دست آمده از تجزیه و تحلیل فوتوکاتالیستی نانوچندسازه با روشهای طیف‎شناسی فروسرخ تبدیل فوریه (FTIR) ، پراش پرتو ایکس (XRD)، میکروسکوپی الکترونی پویشی (SEM) و طیف‎شناسی تفکیک انرژی (EDS) به‎روشنی نشان داد که سطح کائولن با یک لایه کربن نیترید گرافیتی پوشانده شده است. محلول آبی حاوی 50 میلیگرم بر لیتر یون نیترات تحت واکنش فوتوکاتالیستی قرار گرفت. نتیجه های به‎دست آمده حذف نیترات با نانوچندسازه کربن نیترید گرافیتی/کائولن در مقایسه با کربن نیترید گرافیتی و کائولن، بالاترین مقدار تخریب نیترات را در 60 دقیقه اول نشان داد. با روش یادشده و با بازده حذف 15/93 %، غلظت اولیه ppm ۵۰ یون نیترات به ppm 5/3 رسید که این مقدار زیر حد مجاز نیترات برپایه استاندارد سازمان بهداشت جهانی است. بنابراین، به‎کارگیری این نانوچندسازه، به دلیل سادگی روش تهیه و دسترسی تجاری به واکنشگرهای موردنیاز در تهیه آن، و همچنین، راندمان و انتخابگری بالای تولید گاز نیتروژن در تخریب نیترات و نبود آلایندگی پساب، روشی مناسب در حذف فوتوکاتالیستی نیترات از آب آشامیدنی است. تفاصيل المقالة -
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59 - Photocatalytic degradation glyphosate with cerium and nitrogen co-doped TiO2 under visible irradiation
Li Lin Xuejun Zhang Xing XiongCerium and nitrogen co-doped TiO2 nanocrystals were synthesized by a simple sol-gel process, usingtetrabutyl titanate as the raw materials with (NH4)2Ce(SO4)3 and urea as ion donors. The co-doped TiO2nanoparticles were characterized by X-ray diffraction and transmission أکثرCerium and nitrogen co-doped TiO2 nanocrystals were synthesized by a simple sol-gel process, usingtetrabutyl titanate as the raw materials with (NH4)2Ce(SO4)3 and urea as ion donors. The co-doped TiO2nanoparticles were characterized by X-ray diffraction and transmission electro microscopy. Thephotodegradation of glyphosate has been investigated in aqueous suspensions of doped TiO2 under visibleirradiation. The results exhibit a higher thermal stability of anatase than pure TiO2.The uniform test resultsshow the optimal conditions: nCe/nTi nN/nTi and calcining temperature was 0.08,0.01 and 800. The highestdegradation rate for co-doped TiO2 show five times photocatalytic activity of Degussa P25. تفاصيل المقالة -
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60 - Characterization, photocatalytic, and antibacterial activity of Ag–TiO2 nanoparticles prepared by electrical arc discharge method
Mahdi Hajivaliei Majid LashkanpourA simple, inexpensive and one-step synthesis route of Ag-TiO2 nanoparticles by arc discharge method isreported. The resulting nanoparticles were characterized using X-ray diffraction and scanning electronmicroscopy. X-ray diffraction patterns demonstrate dominance of ru أکثرA simple, inexpensive and one-step synthesis route of Ag-TiO2 nanoparticles by arc discharge method isreported. The resulting nanoparticles were characterized using X-ray diffraction and scanning electronmicroscopy. X-ray diffraction patterns demonstrate dominance of rutile to anatase phase in TiO2 andformation of silver metal on TiO2 after arc discharge process. Scanning electron microscopy images exhibitthe increase of reduced nanoparticles in 5 minutes arc duration compared with 1 minute arc duration.Photodegradation of Methyl Orange as a standard pollutant shows that the presence of silver in TiO2 wasfound to enhance the photocatalytic activity. The high activity of silver doped TiO2 is due to theenhancement of electron–hole separation by the electron trapping of silver particles. Antibacterial activitiesof Ag-TiO2 nanoparticles were investigated at the presence of Escherichia coli bacteria. تفاصيل المقالة -
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61 - Study of Methyl tert-butyl Ether (MTBE) Photocatalytic Degradation with UV/TiO2-ZnO-CuO Nanoparticles
Mohsen Mansouri Mohsen Nademi Mohammad Ebrahim Olya Hossein LotfiIn this study, the TiO2-ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), for degradation of MTBE solution in water. The effectiveness of the treatment method applied for the degradation أکثرIn this study, the TiO2-ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), for degradation of MTBE solution in water. The effectiveness of the treatment method applied for the degradation of MTBE based on an advanced photocatalytic oxidation process was investigated. The three various key parameters were optimized using response surface modeling namely: pH, TiO2-ZnO-CuO concentration and the initial MTBE concentrations. The optimized values were obtained at the PH (7), TiO2-ZnO-CuO concentration (1.49 g/L), and the initial MTBE concentration (31.46 mg/L). Finally, kinetics reaction of degradtion MTBE was carried in the optimum conditions. تفاصيل المقالة -
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62 - Insight into the Oxidant Agents Effect of Removal and Photo-decolorization of Vitamin B12 Solution in Drug Tablets using ZrO2
Shaymaa Ibrahim Saeed Ban Hasan Taresh Luma M. Ahmed Zainab Faisal Haboob Safa Alaa Hassan Athraa Abd Al-amir JassimThe purpose of this manuscript was to remove and decolorize vitamin B12 from an aqueous solution of drug tablets using ZrO2 as an environmentally friendly method via advanced oxidation processes. Some oxidant agents such as Fe2+, H2O2, K2S2O8 and their mixture of were p أکثرThe purpose of this manuscript was to remove and decolorize vitamin B12 from an aqueous solution of drug tablets using ZrO2 as an environmentally friendly method via advanced oxidation processes. Some oxidant agents such as Fe2+, H2O2, K2S2O8 and their mixture of were performed, and the best adsorption sequences have occurred with increased adsorption capacity: q(K2S2O8 + H2O2)>q(H2O2) >q (K2S2O8) >q (Fe2+ + H2O2) >q (Fe2+)>q (without) Endothermic and physical adsorption occurred of this vitamin on the ZrO2 surface with and without the addition of K2S2O8 +H2O2. On the other side, the photoreaction for this vitamin with and without the addition of K2S2O8 +H2O2 was found to be quick, endothermic, less random, and spontaneous. At 15 min, 33.223 % and 98. 684% were calculated as the maximum percentage of removal in the dark reaction and the maximum decolorization in the photocatalytic reaction respectively. تفاصيل المقالة -
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63 - Arsenic and Lead Removal from Water by Nano-photocatalytic Systems (A Review)
Shaghayegh Sadr Amir Ershad Langroudi Arezoo Nejaei Ahmad Rabiee Nabiollah MansouriWater is an essential component in the world. The presence of heavy metals in water has dramatic effects on health and ecological process in the environment. Heavy metal pollution in water bodies is an existing and developing problem in the world. There are several meth أکثرWater is an essential component in the world. The presence of heavy metals in water has dramatic effects on health and ecological process in the environment. Heavy metal pollution in water bodies is an existing and developing problem in the world. There are several methods for removing these pollutions in water. A photocatalytic degradation is a useful approach to removal a variety of heavy metals from contaminated water. In this study, we summarized different types of methods for the removal of heavy metals especially arsenic and lead from water. Studies include different nano-photocatalyst and methods such as the use of TiO2 substrates, TiO2 nanotubes, and nanocrystals, organic and inorganic nanoparticles based on silica, a variety of nanomaterial-based polymers, magnetic nanoparticles such as zero-valent iron and zinc oxide, or using two or more of these nanomaterials at the same time as an adsorbent or oxidizer of pollutants, all under visible or ultraviolet light. Each method has some limitations and advantages and based on different research that scientists presented, the efficiency of each technique is depended on some conditions such as pH, adsorption time, solvent type, and UV light, so we still can’t introduce the best method. Nowadays researchers are trying to find a method with high efficiency, low cost, least risk for the environment, and without secondary contamination. Hopefully, researchers find many promising methods that can be used with high efficiency in the future by continuing the research. تفاصيل المقالة -
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64 - حذف فوتوکاتالیزوری رنگزای رودامین ب توسط SnIn4S8 : بهینهسازی فرآیند به روش سطح پاسخ
علی مهریزاددر این مطالعه، عملکرد قلع ایندیوم سولفید (SnIn4S8) در حذف فوتوکاتالیزوری رنگزای رودامین ب (RhB) به عنوان یک نمونه از آلایندههای محیط زیست، مورد بررسی قرار گرفت. از طراحی آزمایش به روش سطح پاسخ (RSM) جهت بهینهسازی متغیرهای عملیاتی (غلظت اولیه RhB، مقدار SnIn4S8، pH محل أکثردر این مطالعه، عملکرد قلع ایندیوم سولفید (SnIn4S8) در حذف فوتوکاتالیزوری رنگزای رودامین ب (RhB) به عنوان یک نمونه از آلایندههای محیط زیست، مورد بررسی قرار گرفت. از طراحی آزمایش به روش سطح پاسخ (RSM) جهت بهینهسازی متغیرهای عملیاتی (غلظت اولیه RhB، مقدار SnIn4S8، pH محلول و زمان تابش نور) استفاده شد. بر اساس نتایج، حداکثر راندمان حذف RhB به مقدار %15/81 در شرایط بهینه حاصل شد. راندمان تئوری حاصل از طراحی آزمایش به روش تجربی نیز تأیید شد (%96/78) و از این طریق، دقت و صحت مدل پیشنهادی مورد تأیید واقع شد. مطالعه سینتیک حذف فوتوکاتالیزوری رنگزای RhB توسط SnIn4S8 نشان داد که فرآیند مذکور از مدل سینتیکی شبه درجه اول با ثابت سرعت min-1 0/047 تبعیت میکند. در واقع، فعالیت فوتوکاتالیزوری چشمگیر SnIn4S8 ناشی از ساختار گل مانند آن است که باعث افزایش جذب فوتونهای نور و جذب سطحی بیشتری از گونه آلاینده میشود. تفاصيل المقالة -
حرية الوصول المقاله
65 - Photocatalytic Degradation of Phenol in Water Solution by Phosphotungstic Acid on TiO2/ZnO Nanoparticles as Supporting Solid
Marzieh Nasiriyan معصومه طباطبایی Seyed Abolghasem MirhoseiniA Keggin-type heteropolyoxometalate (H3PW12O40) supported on TiO2/ZnO nanoparticles was used for the degradation of phenol under UV light and H2O2 as oxidant. Based on the results, heterogenization of H3PW12O40 on TiO2/ZnO could improve the photocatalytic process and أکثرA Keggin-type heteropolyoxometalate (H3PW12O40) supported on TiO2/ZnO nanoparticles was used for the degradation of phenol under UV light and H2O2 as oxidant. Based on the results, heterogenization of H3PW12O40 on TiO2/ZnO could improve the photocatalytic process and could be considered an appropriate heterogonous photocatalyst in the removal of phenol from aqueous solutions in the presence of hydrogen peroxide. Degradation of phenol in the presence of the H3PW12O40/TiO2/ZnO could lead to the disappearance of approximately 95% of phenol under UV irradiation and optimized condition. In the same experiment H3PW12O40 as a homogenous catalyst, removed 70% phenol and the heterogeneous TiO2/ZnO catalyst removed less than 70% phenol from the water solution in the same conditions. تفاصيل المقالة
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