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حرية الوصول المقاله
1 - Application of Electroactive Nano Composite Coated onto Wood Sawdust for the Removal of Malachite Green Dye from Textile Wastewaters
M. H. Fekri M. Banimahd keivani M. Darvishpour H. Banimahd keivaniIn this research, the removal of malachite green dye from Textile Wastewaters using polyaniline coated onto sawdust (PAni/SD) has been investigated. Ammonium peroxodisulphate was used as chemical oxidant for polymerization of polyaniline directly on the surface of sawdu أکثرIn this research, the removal of malachite green dye from Textile Wastewaters using polyaniline coated onto sawdust (PAni/SD) has been investigated. Ammonium peroxodisulphate was used as chemical oxidant for polymerization of polyaniline directly on the surface of sawdust. The effects of some important parameters such as pH, initial concentration, sorbent dosage, exposure time and temperature on uptake of malachite green dye were investigated.Adsorption studies have shown that pH of the malachite green solution has influence on the dye removal capacity of PAni/SD. It was found that effective dye removal is occurred under neutral or acidic conditions. The treatments of data were carried out using both Freundlich and Langmuir adsorption isotherms. تفاصيل المقالة -
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2 - تجزیه نوری و حذف مالاشیت گرین از آب با استفاده از نانو فتوکاتالیست دی‌اکسید تیتانیوم
مهدی بنایی امیر زیدی مریم رضاییزمینه و هدف: مالاشیت گرین به‌طور گسترده به‌عنوان یک قارچ کش، باکتری کش و انگل کش در صنعت آبزی پروری استفاده می شود. این ترکیب همچنین به‌عنوان یک عامل رنگ غذایی، افزودنی های غذایی، مواد ضدعفونی‌کننده پزشکی، و همچنین به‌عنوان یک رنگ در صنایع ابریشم، پشم، کنف، چرم، پنبه، ک أکثرزمینه و هدف: مالاشیت گرین به‌طور گسترده به‌عنوان یک قارچ کش، باکتری کش و انگل کش در صنعت آبزی پروری استفاده می شود. این ترکیب همچنین به‌عنوان یک عامل رنگ غذایی، افزودنی های غذایی، مواد ضدعفونی‌کننده پزشکی، و همچنین به‌عنوان یک رنگ در صنایع ابریشم، پشم، کنف، چرم، پنبه، کاغذ، و آکریلیک استفاده می‌شود. ازاین‌رو، حذف مالاشیت گرین از پساب سیستم های پرورش ماهی و صنایع نساجی، کاغذسازی و آکریلیک، به‌منظور پیشگیری از تأثیر نامطلوب آن بر ارگانیسم های آبزی ضروری است. در این مطالعه، تجزیه مالاشیت گرین با استفاده از نانو ذرات دی اکسید تیتانیوم تحت شرایط نوری UV بررسی شد. روش بررسی: به این منظور، تأثیر پارامترهایی ازجمله غلظت های مختلف مالاشیت گرین (5/3، 7 و 14 میلی گرم بر لیتر)، غلظت نانوکاتالیست (30/1، 60/2 و 20/5 میلی گرم) و pH های مختلف (5، 7 و 9) در شرایط ثابت دمایی 25 درجه سانتی گراد و شدت نور UV ثابت (12 وات، 230 ولت و فرکانس 50 هرتز) در طی 180 دقیقه موردمطالعه قرار گرفت. یافته ها: بهترین نرخ تجزیه نوری مالاشیت گرین، در غلظت 5/3 میلی گرم بر لیتر مالاشیت گرین، 9: pH و 60/2 میلی گرم نانو ذرات دی اکسید تیتانیوم مشاهده شد. اگرچه با افزایش نانو ذرات دی اکسید تیتانیوم رانده‌مان و نرخ حذف مالاشیت گرین افزایش یافت، اما افزایش بیش تر فتوکاتالیست تأثیری در افزایش رانده‌مان تجزیه نوری ندارد. افزایش pH (9) ممکن است از طریق افزایش تولید رادیکال های آزاد بیش تر نرخ حذف مالاشیت گرین افزایش یافت. افزایش غلظت اولیه مالاشیت گرین سبب کاهش رانده‌مان و نرخ حذف مالاشیت گرین گردید. بحث و نتیجه گیری: ازاین‌رو تجزیه نوری مالاشیت گرین در حضور نانو فتوکاتالیست دی‌اکسید تیتانیوم تابعی از pH، غلظت اولیه مالاشیت گرین و غلظت نانو ذرات دی اکسید تیتانیوم است. تفاصيل المقالة -
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3 - حذف رنگ کاتیونی مالاشیت سبز از محلول‌های آبی توسط مخلوط بیوپلیمر کاراگینان و سدیم آلژینات در حضور نانورس مونت موریلونیت
بهجت فرخی نسیم ضیایی فر حسین شیخلوییزمینه و هدف: رنگ کاتیونی مالاشیت سبز از جمله ترکیبات سمی مهم و حائز اهمیت در فاضلاب‌های صنعتی محسوب می‌شود. به‌طور معمول از روش‌های فیزیکوشیمیائی یا بیولوژیکی به منظور تصفیه آب‌های حاوی غلظت‌های بالای مالاشیت سبز استفاده می‌شود. در مطالعه حاضر ابتدا هیدروژل نانو کامپوزی أکثرزمینه و هدف: رنگ کاتیونی مالاشیت سبز از جمله ترکیبات سمی مهم و حائز اهمیت در فاضلاب‌های صنعتی محسوب می‌شود. به‌طور معمول از روش‌های فیزیکوشیمیائی یا بیولوژیکی به منظور تصفیه آب‌های حاوی غلظت‌های بالای مالاشیت سبز استفاده می‌شود. در مطالعه حاضر ابتدا هیدروژل نانو کامپوزیتی بر پایه کاراگینان و سدیم آلژینات در حضور سدیم مونتموریلونیت به عنوان نانورس سنتز سپس برای مطالعه جذب مالاشیت سبز از نمونه های آبی مورد استفاده قرار گرفت. روش بررسی: آکریل آمید[1] به عنوان مونومر، متیلن بیس آکریل آمید[2] به عنوان شبکه ساز آلی و پتاسیم پر سولفات[3] به عنوان آغازگر مورد استفاده قرار گرفتند. برای بررسی خصوصیات هیدروژل بدست آمده از پراش اشعه ایکس[4]، میکروسکوپ الکترونی روبشی[5] و مادون قرمز تبدیل فوریه[6] استفاده گردید. در این مطالعه اثر پارامترهای تجزیه‌ای مختلف نظیر pH، زمان تماس در حذف ماده رنگزا توسط هیدروژل‌های نانو کامپوزیتی سنتز شده بررسی و شرایط بهینه حاصل گردید. یافته ها: با توجه به نتایج حاصل هیدروژل‌های نانو کامپوزیتی سنتز شده به pH و تغییر مقدار کاراگینان و سدیم آلژینات حساس می‌‌باشند. زمان جذب تعادلی تعادلی 3 ساعت بدست آمد. ایزوترم جذب با مدل لانگمویر و سینتیک جذب با مدل سینتیک شبه درجه دوم مناسب‌تر تشخیص داده شد. بحث و نتیجه گیری: سرعت حذف رنگ مالاشیت با افزایش مقدار نانورس در محیط اسیدی افزایش می یابد. در نهایت می توان نتیجه گرفت که مخلوط پلیمر زیستی کاراگینان و سدیم آلژینات در حضور نانورس مونتموریلونیت جاذب مناسبی جهت حذف رنگ مالاشیت سبز از محلول های آبی است. 4- AAM 5- MBA 6- KPS 7- XRD 8- SEM 9- FTIR تفاصيل المقالة -
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4 - تعیین مقدار مالاشیت سبزدر پساب خروجی وبافت ماهیان مزارع پرورش ماهی استان چهار محال و بختیاری
عباس خدابخشی محمد مهدی امین مرضیه وحید دستجردی محمد قاسمیان افشین ابراهیمیزمینه و هدف: یکی از مشکلات زیست محیطی اخیر، وجود ترکیبات سمی، مقاوم و بالقوه سرطان زا در پساب و بافت ماهیان مزارع پرورش ماهی قزل آلا می باشد. از جمله این ترکیبات می توان به مالاشیت سبز اشاره کرد. هدف از انجام این پژوهش تعیین مقدار مالاشیت سبز در پساب و بافت ماهیان مزارع أکثرزمینه و هدف: یکی از مشکلات زیست محیطی اخیر، وجود ترکیبات سمی، مقاوم و بالقوه سرطان زا در پساب و بافت ماهیان مزارع پرورش ماهی قزل آلا می باشد. از جمله این ترکیبات می توان به مالاشیت سبز اشاره کرد. هدف از انجام این پژوهش تعیین مقدار مالاشیت سبز در پساب و بافت ماهیان مزارع پرورش ماهی در استان چهار محال و بختیاری می باشد. روش بررسی: در این مطا لعه توصیفی- تحلیلی، از بین حدود 50 مزرعه پرورش ماهی، پنج مزرعه از سه رده پرورش ماهی بر اساس ظرفیت تولید ماهی (بزرگ، متوسط،کوچک) انتخاب گردید و در طی مدت 3 ماه، هر ماه یک نمونه از پساب و بافت جمع آوری و پس از آماده سازی از نظر وجودترکیب مالاشیت سبز به ترتیب از طریق روش اسپکتروفتومتری و روش کروماتوگرافی مایع با آشکار ساز اسپکترومتری جرمی مورد سنجش فرار گرفت. یافته ها: بر اساس نتایج حاصل از این پژوهش، میزان مالاشیت سبز دربافت ماهیان مزارع پرورش ماهی، شماره های 1، 2، 3، 4، 5 و 6 به ترتیب 6/1،27/0،26/0 ،45/0،28/0 ،32/0میلی گرم در کیلو گرم به دست آمد. محدوده غلظت مالاشیت سبز در پساب مزارع پرورش ماهی مورد مطالعه بین273 7/5 نانو گرم در لیتر تعیین مقدار گردید. نتایج: غلظت مالاشیت سبز در بافت ماهیان مزارع مورد مطالعه بسیار بالاتر از معیارهای بین المللی، همچون دستورالعمل کشور استرالیا (به میزان 03/0 میلی گرم در کیلو گرم) است که نشان دهنده کاربرد گسترده این ترکیب در مزارع پرورش ماهـی منطقه مورد مطالعه می باشد. با وجود این، غلظت مالاشیت سبز در پساب مزارع، کم تر از استاندارد های برخی از کشورهای اروپایی، همچون ایرلند (به میزان 100 میکرو گرمدرلیتر) می باشد. بنا بر این، با توجه به اثرات سرطان زای مالاشیت سبز بر آب زیان و انسان، مسئولان بهداشتی و شیلات بایستی تدابیری جدی اتخاذ نمایند تا از مصرف این ماده در مزارع پرورش ماهی جلوگیری شود و از مواد جایگزین و بی خطر استفاده گردد. تفاصيل المقالة -
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5 - Mesoporous Carbon Modified with Iron Oxide Based Magnetic Nanomaterials for Removal of Malachite Green Dye From Aqueous Solution
Leila Torkian Alireza J. GholinezhadMesoporous carbon (CMK-3) modified with Fe3O4 nanoparticles has been successfully synthesized and characterized by powder X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscope (SEM) and transmission electron microscopy (TEM).The results depi أکثرMesoporous carbon (CMK-3) modified with Fe3O4 nanoparticles has been successfully synthesized and characterized by powder X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscope (SEM) and transmission electron microscopy (TEM).The results depict that the synthesized Fe-CMK-3 preserved the ordered mesoporous structure of CMK-3, and magnetic species were dispersed inside channels of CMK-3 as nanoparticles with the diameter of around 15 nm. When used as adsorbents, Fe-CMK-3 and CMK-3 exhibit excellent performance for removing Malachite Green dye from aqueous solutions. Effects of contact time, pH, initial dye and salt concentrations on dye removal efficiency were investigated. Due to the facility of the separation process with an external magnetic field, Fe- CMK-3 is suggested as a novel adsorbent for the removal of MG dye from aqueous solutions. تفاصيل المقالة -
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6 - Application of Semiconductor Photocatalysis for Effective Elimination of Organic Contaminants from Sewage
Soodabe GharibeThe ZnO/SiO2 semiconductor nanophotocatalysis was synthesized via sol-gel method. Also, theplatinum particles were loaded on the ZnO/SiO2 nanoparticles by photoreductive method. Thestructure of catalyst was confirmed by X-ray diffraction (XRD), scanning electron microsc أکثرThe ZnO/SiO2 semiconductor nanophotocatalysis was synthesized via sol-gel method. Also, theplatinum particles were loaded on the ZnO/SiO2 nanoparticles by photoreductive method. Thestructure of catalyst was confirmed by X-ray diffraction (XRD), scanning electron microscopy(SEM) andfourier transform infrared spectroscopy (FT-IR). The XRD patterns of ZnO particlesdisplayed the nanoparticles have a wurtzite structure (hexagonal phase). The crystallite sizes werecalculated using Scheerer’s equation and were around 32nm. For photocatalytic test, decompositionof Malachite Green oxalate (MG), as an organic pollutant was carried out by synthesized catalyst. Acomparison of degradation between bare catalyst and platinum loaded ZnO/SiO2nanoparticle underUV-Vis light irradiation shows that the Pt-ZnO/SiO2 photocatalyst is more efficient than ZnO/SiO2nanoparticles. Also, the activity of ZnO/SiO2nanoparticles in the visible light are minimal, whileloading of Pt in zinc oxide network displaced the band gap toward longer wavelengths (visiblelight) and increased the photocatalysis activity of ZnO/SiO2 in the range of visible light. تفاصيل المقالة -
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7 - Application of mine waste for wastewater treatment: Efficient organic pollutant removal
Samane Ghaedi Kumars Seifpanahi-ShabaniIn this research, a high porous silicate mining waste that was prepared from Syah Kamar Polymetal Porphyry mine in order to malachite green dye (MG) removal has been applied. The characterization of this natural mineral was determined using the XRD, XRF, SEM and FT-IR a أکثرIn this research, a high porous silicate mining waste that was prepared from Syah Kamar Polymetal Porphyry mine in order to malachite green dye (MG) removal has been applied. The characterization of this natural mineral was determined using the XRD, XRF, SEM and FT-IR analysis. The MG adsorption onto high porous activated waste was studied based on the parameters of pH, temperature, adsorbent dosage, initial dye concentration and contact time. The equilibrium and kinetic adsorption models were experimentally investigated. The obtained data have suggested that the process of MG removal followed up the Sips isotherm and pseudo-second order kinetic. The thermodynamic parameters values consist of ΔG˚, ΔH˚ and ΔS˚ confirms that the adsorption of MG is spontaneous and exothermic reaction. In the optimal condition the removal of MG was more than 93%. This method has a number of advantages, including being low-cost and non-toxic and the availability of natural adsorbent. تفاصيل المقالة -
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8 - Synthesis of Fe3O4/Eggshell and egg membrane Nanocomposite and Application for Adsorption of Cationic and Anionic Dyes
Naereh Besharati nina alizadehThis work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of any stabilizer or surfactant. Fe3O4 magnetic nanoparticles were established on the egg shell. The adsorption of Malachite green (MG) and Crystal violet (CV) as cationic dyes and Er أکثرThis work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of any stabilizer or surfactant. Fe3O4 magnetic nanoparticles were established on the egg shell. The adsorption of Malachite green (MG) and Crystal violet (CV) as cationic dyes and Eriochrome Black T (EBT) as an anionic dye by magnetite nanoparticles loaded egg shell (MNLES) and magnetite nanoparticles loaded egg membrane (MNLEM) were studied. FT-IR, XRD and SEM were used for specification of adsorbents. XRD pattern of MNLES and MNLEM were corresponded to pure magnetite at 2θ= 30.2o, 35.6o, 43.3o and 57.2o. FTIR showed that main peak similar magnetite in 580, 1620 and 3407cm-1. SEM pictures showed that Fe3O4 nanoparticles in nm size loaded on natural adsorbents. Adsorbents dose, pH and contact time as parameters that have effect on dyes removal were investigated. Pseudo-first order, pseudo-second order, intraparticle diffusion and Elovich models were used for study of kinetic of adsorption. The sorption of the MG, EBT, CV on the MNLEM were pseudo second-order model. The sorption of the MG and EBT on MNLES were described by Elovich and pseudo second-order model. Value of qmax from the Langmuir model for adsorption of CV, EBT and MG were 61.72, 21.69 and 38.31mg g -1 for MNLEM and qmax for adsorption of EBT, MG on the MNLES was 40.0 and 25.12mg g -1. It was found MNLES and MNLEM can be used as efficient adsorbents for removal of EBT more than cationic dyes (MG, CV). تفاصيل المقالة -
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9 - Removal of malachite green by using immobilized glucose oxidase onto silica nanostructure-coated silver metal-foam
Mansour Hemmati Mohammad Barkhi Hadi Baharifar Kamyar KhoshnevisanEnzymes Immobilization onto different types of substrate could be helpful in various applications of biomedical devices and biosensors. Enzyme activity and stability could be affected by support and method of immobilization. In this study, the silver metal foam was succ أکثرEnzymes Immobilization onto different types of substrate could be helpful in various applications of biomedical devices and biosensors. Enzyme activity and stability could be affected by support and method of immobilization. In this study, the silver metal foam was successfully synthesized by soft-shell method and then was coated with silica. Then, glucose oxidase (GOx) was immobilized on non-coated and silica-coated silver metal foam and removal of malachite green was investigated. Fourier Transform Infrared Spectroscopy (FT-IR) and scanning electron microscopy (SEM) results confirmed that the enzyme was attached to support surface. The maximum immobilized enzyme activity was about 118.980 U/grSupport at 40ᵒC. The removal of malachite green showed the indirect relation with dye concentration confirmed by decolorization assay. The increasing activity, thermal stability, and reusability of immobilized glucose oxidase onto the silver metal foam in comparison to free enzyme introduce the capability of the biological system for removal of malachite green in the industry. تفاصيل المقالة -
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10 - Photocatalytic degradation of Malachite Green using ZnO and ZnO-TiO2 nanoparticles from aqueous solution
hadi baseri Elahe AlizadehToday, despite of the increasing demands for the products of chemical industries and the related factories, the challenges of environmental pollution has not been improved and it is approaching a very dangerous stage. In this regard, the role of dyeing industries in con أکثرToday, despite of the increasing demands for the products of chemical industries and the related factories, the challenges of environmental pollution has not been improved and it is approaching a very dangerous stage. In this regard, the role of dyeing industries in contaminating the environment is undeniable. In this research, ZnO and ZnO-TiO2 nanoparticles were synthesized by co-precipitation and sol-gel methods, respectively. The synthesized nanoparticles were characterized by XRD and FE-SEM techniques and their band gap energy were determined using the UV-Vis spectrum obtained from the suspension of nanoparticles. By using synthesized nanoparticles, degradation of malachite green under irradiation of the UV (A)-Visible mixture light from aqueous solution were evaluated and the effect of different parameters such as amount of photo catalyst, time of light irradiation and dose of H2O2 have been studied. The destruction amount was determined by UV-Vis spectroscopy method. Based on the reported results, the maximum degradation efficiency of about 99% was obtained in the optimal values of experimental conditions. تفاصيل المقالة -
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11 - Adsorption of malachite green dye on different natural absorbents modified with magnetite nanoparticles
nina alizadeh Naereh BesharatiThis study was focused on the adsorption of malachite green as a cationic dye on magnetite nanoparticles loaded green tea waste (MNLGTW), peanut husk (MNLPH), Azolla (MNLA) and Fig leave (MNLFL) as naturally cheap sources of adsorbent. MNLGTW, MNLPH, MNLA and MNLFL were أکثرThis study was focused on the adsorption of malachite green as a cationic dye on magnetite nanoparticles loaded green tea waste (MNLGTW), peanut husk (MNLPH), Azolla (MNLA) and Fig leave (MNLFL) as naturally cheap sources of adsorbent. MNLGTW, MNLPH, MNLA and MNLFL were prepared with chemical precipitation method and they were characterized with Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Energy Dispersive X- ray (EDX) analysis. Different parameters affecting the dye removal efficiency were optimized. At optimum conditions, the sorption of the malachite green on the MNLGTW, MNLPH, MNLA and MNLFL adsorbents was best described by a pseudo second-order kinetic model with R2 =1, qeq= 12.51 mg g-1 , R2 =0.9996, qeq=625 mg g-1 , R2 =0.9842, qeq=0.5772 mg g-1 and R2 =0.9912, qeq=0.517 mg g-1 respectively. Equilibrium data were fitted well to the Langmuir isotherm more than Freundlich and Temkin isotherm. The synthesized sorbent showed complete dye removal with 112.359, 98.039, 23.1 and 73.2 mg g-1 for MNLGTW, MNLPH, MNLA and MNLFL, respectively. The results showed MNLGTW, MNLPH, MNLA and MNLFL can be used as efficient adsorbents for removal of malachite green from aqueous solutions. تفاصيل المقالة -
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12 - Adsorption of malachite green dye on different natural absorbents modified with magnetite nanoparticles
Naereh Besharati Nina AlizadehThis study was focused on the adsorption of malachite green as a cationic dye on magnetite nanoparticles loaded green tea waste (MNLGTW), peanut husk (MNLPH), Azolla (MNLA) and Fig leave (MNLFL) as naturally cheap sources of adsorbent. MNLGTW, MNLPH, MNLA and MNLFL were أکثرThis study was focused on the adsorption of malachite green as a cationic dye on magnetite nanoparticles loaded green tea waste (MNLGTW), peanut husk (MNLPH), Azolla (MNLA) and Fig leave (MNLFL) as naturally cheap sources of adsorbent. MNLGTW, MNLPH, MNLA and MNLFL were prepared with chemical precipitation method and they were characterized with Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Energy Dispersive X- ray (EDX) analysis. Different parameters affecting the dye removal efficiency were optimized. At optimum conditions, the sorption of the malachite green on theMNLGTW, MNLPH, MNLA, and MNLFL adsorbents was best described by a pseudo second-order kinetic model with R2 =1, qeq= 12.51 mg g-1 , R2 =0.9996, qeq=625 mg g-1 , R2 =0.9842, qeq=0.5772 mg g-1 and R2 =0.9912, qeq=0.517 mg g-1 respectively. Equilibrium data were fitted wellto the Langmuir isotherm more than Freundlich and Temkin isotherm. The synthesized sorbent showed complete dye removal with 112.359, 98.039, 23.1 and 73.2 mg g-1 for MNLGTW, MNLPH, MNLA,and MNLFL, respectively. The results showed MNLGTW, MNLPH, MNLA and MNLFL can be used as efficient adsorbents for removal of malachite green from aqueous solutions. تفاصيل المقالة -
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13 - Removal of Malachite Green by Using Immobilized Glucose Oxidase Onto Silica Nanostructure-Coated Silver Metal-Foam
Mansour Hemmati Mohammad Barkhi Hadi Baharifar Kamyar KhoshnevisanEnzymes Immobilization onto different types of the substrate could be helpful in various applicationsof biomedical devices and biosensors. Enzyme activity and stability could be affected by support andmethod of immobilization. In this study, the silver metal foam was su أکثرEnzymes Immobilization onto different types of the substrate could be helpful in various applicationsof biomedical devices and biosensors. Enzyme activity and stability could be affected by support andmethod of immobilization. In this study, the silver metal foam was successfully synthesized by thesoft-shell method and then was coated with silica. Then, glucose oxidase (GOx) immobilized on noncoated,and silica-coated silver metal foam and removal of malachite green was investigated. FourierTransform Infrared Spectroscopy (FT-IR) and scanning electron microscopy (SEM) results confirmedthat the enzyme was attached to support surface. The maximum immobilized enzyme activity wasabout 118.980 U/grSupport at 40°C. The removal of malachite green showed the indirect relationwith dye concentration confirmed by decolorization assay. The high activity, thermal stability, andreusability of immobilized glucose oxidase onto the silver metal foam in comparison to free enzymeintroduce the capability of the biological system for removal of malachite green in the industry. تفاصيل المقالة -
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14 - Synthesis of Fe3O4/Eggshell and egg membrane Nanocomposite and Application for Adsorption of Cationic and Anionic Dyes
Naereh Besharati Nina AlizadehThis work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of anystabilizer or surfactant. Fe3O4 magnetic nanoparticles were established on the egg shell. The adsorptionof Malachite green (MG) and Crystal violet (CV) as cationic dyes and Erio أکثرThis work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of anystabilizer or surfactant. Fe3O4 magnetic nanoparticles were established on the egg shell. The adsorptionof Malachite green (MG) and Crystal violet (CV) as cationic dyes and Eriochrome Black T (EBT) as ananionic dye by magnetite nanoparticles loaded egg shell (MNLES) and magnetite nanoparticles loadedegg membrane (MNLEM) were studied. FT-IR, XRD and SEM were used for specification of adsorbents.XRD pattern of MNLES and MNLEM were corresponded to pure magnetite at 2θ= 30.2o, 35.6o, 43.3o and57.2o. FTIR showed that main peak similar magnetite in 580, 1620 and 3407cm-1. SEM pictures showedthat Fe3O4 nanoparticles in nm size loaded on natural adsorbents. Adsorbents dose, pH and contacttime as parameters that have an effect on dye removal were investigated. Pseudo-first order, pseudosecondorder, intraparticle diffusion and Elovich models were used for study of kinetic of adsorption. Thesorption of the MG, EBT, CV on the MNLEM were pseudo second-order model. The sorption of the MGand EBT on MNLES were described by Elovich and pseudo second-order model. Value of qmax from theLangmuir model for adsorption of CV, EBT and MG were 61.72, 21.69 and 38.31mg g -1 for MNLEM andqmax for adsorption of EBT, MG on the MNLES was 40.0 and 25.12mg g -1. It was found MNLES and MNLEMcan be used as efficient adsorbents for removal of EBT more than cationic dyes (MG, CV). تفاصيل المقالة -
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15 - Photocatalytic degradation of Malachite Green using ZnO and ZnOTiO2 nanoparticles from aqueous solution
Hadi Baseri Elahe AlizadehToday, despite the increasing demands for the products of chemical industries and the relatedfactories, the challenges of environmental pollution have not been improved and it is approaching avery dangerous stage. In this regard, the role of dyeing industries in contami أکثرToday, despite the increasing demands for the products of chemical industries and the relatedfactories, the challenges of environmental pollution have not been improved and it is approaching avery dangerous stage. In this regard, the role of dyeing industries in contaminating the environment isundeniable. In this research, ZnO and ZnO-TiO2 nanoparticles were synthesized by co-precipitation andsol-gel methods, respectively. The synthesized nanoparticles were characterized by XRD and FE-SEMtechniques and their band gap energy were determined using the UV-Vis spectrum obtained from thesuspension of nanoparticles. By using synthesized nanoparticles, degradation of malachite green underirradiation of the UV (A) -Visible mixture light from aqueous solution were evaluated and the effect ofdifferent parameters such as amount of photo catalyst, time of light irradiation and dose of H2O2hasbeen studied. The destruction amount was determined by UV-Vis spectroscopy method. Based on thereported results, the maximum degradation efficiency of about 99% was obtained in the optimal valuesof experimental conditions. تفاصيل المقالة
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