-
دسترسی آزاد مقاله
1 - Ultrasonic Assisted Adsorption of Crystal Violet (CV) Dye by CM-β-CD-Fe3O4NPs Synthesis: Experimental Design Methodology
Ali Omaniziarati Gholamhossein VatankhahThe applicability of the synthesized CM-β-CD-Fe3O4NPs as a novel adsorbent for eliminating Crystal Violet (CV) dye from aqueous media was investigated. This paper focuses on the development of an effective methodology to obtain the optimum removal conditions assist چکیده کاملThe applicability of the synthesized CM-β-CD-Fe3O4NPs as a novel adsorbent for eliminating Crystal Violet (CV) dye from aqueous media was investigated. This paper focuses on the development of an effective methodology to obtain the optimum removal conditions assisted by ultrasonic to maximize removal of (CV) dye onto CM-β-CD-Fe3O4NPs in aqueous solution using response surface methodology (RSM). This novel material was characterized by different techniques such as FT-IR, XRD and SEM. The influences of variables such as initial (CV) dye concentration (X1), pH (X2), adsorbent dosage (X3), sonication time (X4) investigated by central composite design (CCD) under response surface methodology. The process was empirically modeled to reveal the significant variables and their possible interactions. The optimization conditions were set as: 10.0 mg L-1, 6.0, 5 min and 0.025 g, for ultrasound time, pH, adsorbent mass, (CV) dye concentration respectively. Finally, it was shown that the adsorption of (CV) dye removal by adsorbent was at pH 6.0. This issue that the sorption of (CV) dye conforms to the pseudo-second-order rate equation and the Langmuir model explains equilibrium data was clearly proven. The maximum monolayer capacity (qmax) was found to be 100.0 mgg-1 for (CV) dye at optimum conditions. The application of Isotherms in obtaining the thermodynamic parameters like free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) of adsorption were confirmed. The exothermicity of the process was proven by negative value of (ΔGo, ΔHo and ΔSo) which showed the affinity of CM-β-CD-Fe3O4NPs synthesis for Crystal Violet (CV) dye deletion. پرونده مقاله -
دسترسی آزاد مقاله
2 - جذب رنگ متیلن بلو از محلول‌های آبی با استفاده از جاذب بلوط مغناطیسی
فرهاد سلیمی ساریه پیرهزمینه و هدف: هر ساله میلیون ها تن مواد رنگی وارد پساب ها می شوند که این مواد از خطرناک ترین ترکیبات شیمیایی محسوب می شوند و حذف این مواد از پساب ها یک ضرورت است. هدف از این مطالعه بررسی و شناسایی امکان استفاده از جاذب بلوط مغناطیسی به عنوان یک جاذب کم هزینه برای حذف متی چکیده کاملزمینه و هدف: هر ساله میلیون ها تن مواد رنگی وارد پساب ها می شوند که این مواد از خطرناک ترین ترکیبات شیمیایی محسوب می شوند و حذف این مواد از پساب ها یک ضرورت است. هدف از این مطالعه بررسی و شناسایی امکان استفاده از جاذب بلوط مغناطیسی به عنوان یک جاذب کم هزینه برای حذف متیلن بلو از محلول های آبی است. روش و بررسی: با استفاده از آنالیز FTIR وجود آهن مغناطیسی در ساختار بلوط بررسی شد. در این کار از یک سیستم ناپیوسته برای انجام فرایند جذب استفاده شد و اثر pH، دوز جاذب، غلظت اولیه متیلن بلو، زمان تماس به عنوان پارامترهای کلیدی مورد بررسی قرار گرفت. همچنین مدل های ایزوترم مختلف جهت بررسی داده های آزمایشگاهی استفاده شدند. بافته ها: نتایج به خوبی نشان می دهد که افزایشpH باعث افزایش درصد حذف شده و بیشترین مقدار جذب در pH معادل 7 است. بررسی مدل های جذب نشان داد که ایزوترم های لانگمویر و Dubinin Radushkevich نسبت به مدل های دیگر تطابق بهتری با داده های آزمایشگاهی دارند. بررسی داده های سینتیکی نشان داد که داده ها از مدل شبه درجه دوم پیروی می کند. بحث و نتیجه گیری: این مطالعه به خوبی نشان داد که جاذب ارائه شده به خوبی قابلیت حذف رنگ را از پساب دارد. همچنین دارا بودن خاصیت مغناطیسی جاذب، سرعت احیا آن را سریع و راحت تر می کند. پرونده مقاله -
دسترسی آزاد مقاله
3 - Preparation and Application of Fe3O4@SiO2@OSO3H Nanocomposite as a Green Catalyst for the Synthesis of Octahydroquinazolinones
Mohammad Ali GhasemzadehIn this research the magnetite nanoparticles supported silica sulfonic acid(Fe3O4@SiO2@OSO3H) was used as a green and efficient catalyst for the preparation ofoctahydroquinazolinone derivatives as biologically active heterocyclic compounds. Thisprocedure avoids hazardou چکیده کاملIn this research the magnetite nanoparticles supported silica sulfonic acid(Fe3O4@SiO2@OSO3H) was used as a green and efficient catalyst for the preparation ofoctahydroquinazolinone derivatives as biologically active heterocyclic compounds. Thisprocedure avoids hazardous reagents, solvents, catalyst and can be an eco-friendly alternativeto the existing methods. The one-pot three-component reaction of aldehydes, dimedone andurea or thiourea has several advantages such as: simple procedure, eco-friendly approach,excellent yields, short reaction times, little catalyst loading, simple purification and facilecatalyst separation. In addition, the synthesis and application of Fe3O4@SiO2@OSO3Hnanocomposite as a robust and recoverable heterogeneous nanocatalyst is described. Fe3O4nanoparticles encapsulated-silica particles bearing sulfonic acid were readily recovered usingan external magnet and could be reused several times without significant loss of its reactivity.The catalyst was fully characterized by different spectroscopic techniques including VSM,FT-IR, SEM, XRD, EDX and TEM analysis. پرونده مقاله -
دسترسی آزاد مقاله
4 - Green Synthesis and Investigation of Antioxidant Activity of New Quinoline Derivatives
Seyyed Ali Moghaddas Zinatossadat Hossaini Daryoush ZareyeeNew derivatives of furo[2,3-f]quinoline derivatives in high yields using multicomponent reaction ofthe 2-amino-4-hydroxyacetophenone, isopropenylacetylene, aldehydes and malononitrile or ethylcyanoacetate in the presence of catalytic amounts of Fe3O4/KF/Clinoptilolite@M چکیده کاملNew derivatives of furo[2,3-f]quinoline derivatives in high yields using multicomponent reaction ofthe 2-amino-4-hydroxyacetophenone, isopropenylacetylene, aldehydes and malononitrile or ethylcyanoacetate in the presence of catalytic amounts of Fe3O4/KF/Clinoptilolite@MWCNTs magneticnanocomposites using ionic liquid as green solvent at room temperature were synthesized. Thiscatalyst could be employed several times in these reactions and have the main role in the yield ofthe product. The synthesized compounds have NH group in their structure and for this reason, havegood antioxidant activity. Our procedure for preparation of furo[2,3-f]quinoline derivatives hassome advantages such as low reaction time, the product with high yields, and simple separation ofcatalyst and products. پرونده مقاله -
دسترسی آزاد مقاله
5 - Magnetic Solid Phase Extraction of Triazine Herbicides from Environmental Aquatic Media using Polyaniline/ Fe3O4 Nanocomposite
Faezeh Khalilian Amir Adl YektaPolyaniline/Fe3 O4 magnetic nanoparticles were synthesized and employed as a sorbent for the magnetic solid phase extraction (MSPE) of seven triazine herbicides from environmental water samples. The properties of the prepared magnetic sorbent were characterized using fi چکیده کاملPolyaniline/Fe3 O4 magnetic nanoparticles were synthesized and employed as a sorbent for the magnetic solid phase extraction (MSPE) of seven triazine herbicides from environmental water samples. The properties of the prepared magnetic sorbent were characterized using field emission-scanning electron microscopy (FE-SEM), fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA) methods. Effect of the different parameters influencing the MSPE efficiency, such as sample pH, sorbent amount, and extraction time were investigated and optimized. The amount of enrichment factors for triazines using proposed method were found in the range of 26-49. Calibration curves of triazines showed linearity in the range of 1-1000, 2-1000 and 5-1000 µg/L for analytes. In addition, the detection limits for the analytes were in the range of 0.2-0.9 µg/L. The values of relative standard deviation (RSD%) for n=5 at the concentration level of 10 µg/L were obtained lower than 3.1% for all analytes. Capability of polyaniline/Fe3 O4 magnetic nanoparticles in extraction of triazines was compared with naked Fe3 O4 and polyaniline. The proposed method was also successfully applied to the extraction of triazine herbicides from environmental samples and satisfactory relative recoveries were obtained. پرونده مقاله -
دسترسی آزاد مقاله
6 - Application of CM-β-CD-Fe3O4NPs: As an Adsorbent for the Removal of Aluminum ion from Wastewater
Amir Abbas Ghazali Farzaneh Marahel Bijan Mombeni GoodajdarThe applicability of CM-β-CD-Fe3O4NPs synthesis for the removal of Aluminum ion from wastewater was studied. The active sites and morphology structure of CM-β-CD-Fe3O4NPs synthesis were analyzed using BET, FT-IR, XRD, SEM, and XPS respectively. The effect of i چکیده کاملThe applicability of CM-β-CD-Fe3O4NPs synthesis for the removal of Aluminum ion from wastewater was studied. The active sites and morphology structure of CM-β-CD-Fe3O4NPs synthesis were analyzed using BET, FT-IR, XRD, SEM, and XPS respectively. The effect of independent variables namely pH, adsorbent dosage, contact time, Al (III) ion concentration in solution, were investigated through batch experiments, and to be 7, 50 mg L-1, 0.1 g and 90 min for the adsorption of Al (III) ion onto CM-β-CD-Fe3O4NPs sorbent were found respectively. The adsorbed Al (III) ion onto the CM-β-CD-Fe3O4NPs showed excellent fitting to the pseudo-first-order adsorption kinetic with a correlation coefficient value of 0.999.Meanwhile, the experimental equilibrium data were fitted to the conventional isotherm models accordingly. Freundlich isotherm has good applicability for the experimental data with a maximum adsorption capacity (qmax) of 35.88 mgg-1 for Al (III) ion onto CM-β-CDFe3O4NPs. The overall results confirmed that CM-β-CD-Fe3O4NPs could be a promising adsorbent material for Al (III) ion removal from wastewater treatment. پرونده مقاله -
دسترسی آزاد مقاله
7 - The Glycolysis of Poly (ethylene terephthalate) Waste:Recovery of Terephthalic Acid by Magnetic FeO@APTS Nanoparticle
Mir Mohammad Alavi Nikje Elmira Ghamari Lida Sarchami Seyedeh Leila Rahmani AndabilIn this research, the chemical recycling of terephthalic acid from PET waste by using nanoFe3O4@Py-APTS as solid support was reported. The performance of organically modifiednano magnetic was examined in detail and the results were compared with unsupportedreactions as چکیده کاملIn this research, the chemical recycling of terephthalic acid from PET waste by using nanoFe3O4@Py-APTS as solid support was reported. The performance of organically modifiednano magnetic was examined in detail and the results were compared with unsupportedreactions as the model. By using the solid support, the required time for complete glycolysis,consumption of solvent and catalyst, decreased up 95 %, 37.5 % and 30 % respectively. Results showed that nano Fe3O4@Py-APTS delivered good performance as the reagent as well as the solid support in depolymerizing of PET to the terephthalic acid. پرونده مقاله -
دسترسی آزاد مقاله
8 - Response Surface Methodology Modeling to Determine of Trace Amounts of Phenolic Compounds Using Silver Modified / Zero Valent Iron/ Fe3O4@G Nanocomposite
Mahmoud Reza Sohrabi Mohammad Reza Kashefi Alasl Mehran DavalloIn this study, a simple and fast magnetic dispersive solid phase extraction methodology was developed G@Fe3O4/Fe/Ag nanoparticles for preconcentration and determine of phenolic compounds in water samples. The sorbent was characterized by assorted characterization method چکیده کاملIn this study, a simple and fast magnetic dispersive solid phase extraction methodology was developed G@Fe3O4/Fe/Ag nanoparticles for preconcentration and determine of phenolic compounds in water samples. The sorbent was characterized by assorted characterization method. The effects of diverse factor on the extraction process were studied thoroughly via design of experiment and desirability function. This work was showed the G@Fe3O4/Fe/Ag NPs was the best sorbent between Graphene, G@Fe3O4/Fe and Fe3O4, 0.01M HNO3in acetonitrile was the most efficiency between eluent types, the best salt content which was 7.5% w/v. پرونده مقاله -
دسترسی آزاد مقاله
9 - Fe3O4@SiO2/BiPy2+2Cl– nanocomposite promoted rapid synthesis of Pyranopyrazole and Octahydroquinazoline derivatives
Sara Hosseini Ali Reza Kiasat Asadollah FarhadiFe3O4@SiO2/bipyridinium chloride nanocomposite, Fe3O4@SiO2/BiPy+22Cl-, as a magnetically separable and recyclable heterogeneous catalyst was used for the one-pot synthesis of pyranopyrazole and octahydroquinazoline derivatives via multi-components cyclocondensation reac چکیده کاملFe3O4@SiO2/bipyridinium chloride nanocomposite, Fe3O4@SiO2/BiPy+22Cl-, as a magnetically separable and recyclable heterogeneous catalyst was used for the one-pot synthesis of pyranopyrazole and octahydroquinazoline derivatives via multi-components cyclocondensation reaction under solvent free conditions. The catalyst was recovered by simple magnetic decantation and can be recycled several times with no significant loss of its catalytic activity. The results showed that the desired products were obtained with high efficiency, rapid, simple, and eco-friendly. پرونده مقاله -
دسترسی آزاد مقاله
10 - پیش تغلیظ آملودیپین درنمونه های بیولوژیکی توسط نانو کامپوزیت مغناطیسی اصلاح شده با کیتوسان و اندازه گیری توسط طیف سنجی مرئی-فرابنفش
علی مقیمی نیلوفر تاجدینی محمد یاریدر این تحقیق تکنیک های جدید استخراج فاز جامد پخشی مقادیر ناچیز پساب های دارویی به عنوان شاخص داروی آملودیپین در نمونه های آبی بوسیله نانو لوله های کربنی اصلاح شده مغناطیسی با کیتوسان و اندازه گیری آن با طیف سنجی مرئی و فرابنفش در نمونه های حقیقی به کار گرفته شد. این تکن چکیده کاملدر این تحقیق تکنیک های جدید استخراج فاز جامد پخشی مقادیر ناچیز پساب های دارویی به عنوان شاخص داروی آملودیپین در نمونه های آبی بوسیله نانو لوله های کربنی اصلاح شده مغناطیسی با کیتوسان و اندازه گیری آن با طیف سنجی مرئی و فرابنفش در نمونه های حقیقی به کار گرفته شد. این تکنیک ها یک سیستم دو فازی هستند که در آن ها فاز دهنده نمونه های آبی حاوی آملودیپین هستند و فاز گیرنده نانو لوله های کربنی مغناطیسی عامل دار شده با کیتوسان هستند. آزمایشات در دو مرحله استخراج از نمونه های آبی واجذب داروی آملودیپین با استفاده از حلال آمونیاک انجام شدند و نمونه های واجذب شده به دستگاه اسپکترو فتومتری UV-Vis برای آنالیز بیشتر ارائه شدند. این روش ارزان، ساده و سریع بوده و با بسیاری از روش های دستگاهی موجود نیز همخوانی دارند. پارامترهای استخراج از قبیل اثر حلال آلی واجذب کننده ،pH بهینه جذب داروی آملودیپین بر روی جاذب که در این آزمایش ۷= pH به عنوان pH بهینه بدست آمد. زمان استخراج، سرعت همزدن، حجم فاز دهنده بهینه شدند و بررسی ها و اندازه گیری های کمی تحت شرایط بهینه انجام شد. تکنیک های ذکر شده از مزایای بسیاری مانند؛ زمان کوتاه استخراج، مصرف کم حلالهای آلی، حد تشخیص پایین و فاکتور تغلیظ بالا برخوردارهستند. فاکتور تغلیظ و حد تشخیص برای داروی آملودیپین به ترتیب ۵/۱۲و µgL-1 ۵/۳ بدست آمده اند. دامنه خطی بین mgL-1 ۷-۰۱/۰ و انحراف استاندارد نسبی برای آملودیپین ۵/۱% و ۹۹۸۱/۰R2= بدست آمده است. پرونده مقاله -
دسترسی آزاد مقاله
11 - استخراج فاز جامد پخشی برای پیش تغلیظ داروی آملودیپین در نمونه های آبی با استفاده از نانو مغناطیسی اصلاح شده با بتاسیکلودکسترین
علی مقیمی مصطفی شجاعی میلاد آبنیکیدر این تحقیق تکنیک استخراج فاز جامد پخشی از مقادیر ناچیز داروی آملودیپین در نمونه های آبی بوسیله نانولوله های کربنی مغناطیسی اصلاح شده با بتاسیکلودکسترین و انداز ه گیری آن با طیف سنجی مرئی و ماورابنفش به کار گرفته شد. آزمایشات در دو مرحله استخراج از نمونه های آبی واجذب چکیده کاملدر این تحقیق تکنیک استخراج فاز جامد پخشی از مقادیر ناچیز داروی آملودیپین در نمونه های آبی بوسیله نانولوله های کربنی مغناطیسی اصلاح شده با بتاسیکلودکسترین و انداز ه گیری آن با طیف سنجی مرئی و ماورابنفش به کار گرفته شد. آزمایشات در دو مرحله استخراج از نمونه های آبی واجذب داروی آملودیپین با استفاده از حلال آمونیاک انجام شدند و نمونه های واجذب شده به دستگاه اسپکترو فتومتری UV-Vis برای آنالیز بیشتر ارائه شدند. این روش ارزان، ساده و سریع بوده و با بسیاری از روش های دستگاهی موجود نیز همخوانی دارند. پارامترهای استخراج از قبیل اثر حلال آلی واجذب کننده ،pH بهینه جذب داروی آملودیپین بر روی جاذب که در این آزمایش ۶= pH به عنوان pH بهینه بدست آمد. زمان استخراج، سرعت همزدن، حجم فاز دهنده بهینه شدند و بررسی ها و اندازه گیری های کمی تحت شرایط بهینه انجام شد. تکنیک های ذکر شده از مزایای بسیاری مانند؛ زمان کوتاه استخراج، مصرف کم حلالهای آلی، حد تشخیص پایین و فاکتور تغلیظ بالا برخوردارهستند. فاکتور تغلیظ و حد تشخیص برای داروی آملودیپین به ترتیب ۵/۱۴و µgL-1 ۵/۷ بدست آمده اند. دامنه خطی بین mgL-1 ۹/۷-۰۲/۰ و انحراف استاندارد نسبی برای آملودیپین ۹/۱٪و ۹۹۸۹/۰R2= بدست آمده است. پرونده مقاله -
دسترسی آزاد مقاله
12 - سنتز سبز و مشخصهیابی نانوذرات Fe3O4 با استفاده از عصاره آبی تفاله چای و کاربرد آن در تهیه نانوکامپوزیت Fe3O4/Cellulose
امیر عزیزی کاوه خسرویدر این مطالعه، نانوذرات اکسیدآهن مغناطیسی به روش سبز و با استفاده از عصاره آبی تفاله‌های چای به عنوان عامل کاهنده تولید و در ادامه از آنها به منظور تهیه نانوکامپوزیت مغناطیسی و زیست تخریب‌پذیر Fe3O4/Cellulose استفاده شد. نانوساختارهای تهیه شده با استفاده از اسپکتروفوتو چکیده کاملدر این مطالعه، نانوذرات اکسیدآهن مغناطیسی به روش سبز و با استفاده از عصاره آبی تفاله‌های چای به عنوان عامل کاهنده تولید و در ادامه از آنها به منظور تهیه نانوکامپوزیت مغناطیسی و زیست تخریب‌پذیر Fe3O4/Cellulose استفاده شد. نانوساختارهای تهیه شده با استفاده از اسپکتروفوتومتری UV-Vis، FTIR، XRD، SEM، TEM، TGA و VSM مشخصهیابی و باهم مقایسه شدند. داده‌های حاصل از آنالیزهای صورت گرفته نشان دادند که نانوکامپوزیت سنتز شده دارای ساختاری کروی با میانگین اندازه ذرات nm 5/15 می‌باشند که در مقایسه با اندازه نانوذرات Fe3O4 خالص از میانگین کمتری nm 28، برخوردار هستند. این نتایج همچنین نشان داد که نانوکامپوزیت تهیه شده دارای مقاومت حرارتی بالاتری (°C 450-800) در مقایسه با سلولز خالص می‌باشد. خاصیت مغناطیسی نانوکامپوزیت emu/g 25 تعیین شد که کمتر از مقدار بدست آمده در نانوذرات Fe3O4 خالص (emu/g 45) بود. در ادامه ظرفیت تورمی مورد مطالعه قرار گرفت و g/g 3/139 تعیین گردید، که بیشتر از ظرفیت تورمی محاسبه شده برای سلولز خالص (g/g 8/66)، بود. با توجه به نتایج بدست آمده در این مطالعه، نانوکامپوزیت تهیه شده به دلیل برخورداری از ویژگی‌های مناسب و قابل قبولی از قبیل ظرفیت جذب بالای آب، قابلیت انتقال کنترل شده به صورت مغناطیسی و زیست تخریب‌پذیری برای استفاده در فناوری‌های مختلف از قبیل دارورسانی و تصفیه آب پیشنهاد شد. پرونده مقاله -
دسترسی آزاد مقاله
13 - ساخت، مشخصهیابی و بررسی فعالیت آنتی‌باکتریال نانوهیبرید سه‌گانه نانولوله‌های کربنی– دی‌اکسید تیتانیوم– نقره (CNTs-TiO2-Ag)
مسعود فضل‌الله‌پور محمد اکبرزاده پاشا سلمان احمدی اسبچیندر این پژوهش، با استفاده از روش سل-ژل، هیبرید دوگانه نانولوله کربنی چند دیواره- دی اکسید تیتانیوم (MWCNTs-TiO2) ساخته شد و سپس طی یک فرآیند شیمیایی نرم چهار غلظت مختلف 06/0، 08/0، 1/0 و 2/0 مولار محلول آبی نیترات نقره به هیبرید مذکور اضافه گردید و هیبریدهای سه‌گانه نانو چکیده کاملدر این پژوهش، با استفاده از روش سل-ژل، هیبرید دوگانه نانولوله کربنی چند دیواره- دی اکسید تیتانیوم (MWCNTs-TiO2) ساخته شد و سپس طی یک فرآیند شیمیایی نرم چهار غلظت مختلف 06/0، 08/0، 1/0 و 2/0 مولار محلول آبی نیترات نقره به هیبرید مذکور اضافه گردید و هیبریدهای سه‌گانه نانولوله‌کربنی- دی‌اکسیدتیتانیوم- نقره (MWCNTs-TiO2-Ag) با چهار مقدار مختلف نشست نقره بدست آمدند. همچنین هیبرید دوگانه نانولوله‌کربنی- نقره (MWCNTs-Ag) و نانوذرات دی اکسید تیتانیوم و نانوذرات نقره به تنهایی به روش شیمیایی سنتز شدند. بررسی‌های میکروسکوپ الکترونی نشان داد که هیبریدهای دو و سه‌گانه شکل گرفته و نانوذرات دی‌اکسید تیتانیوم و نقره به بدنه نانولوله‌های کربنی چسبیده‌اند. پراش پرتو ایکس حضور همزمان ساختار هگزاگونال نانولوله‌های کربنی و فاز آناتاز نانوذرات تیتانیا را در هیبرید سه‌گانه تایید کرد. مشاهده شد که میزان نشست نانوذرات تیتانیا بسیار بیشتر از نقره است. طیف‌سنجی تبدیل فوریه فروسرخ اتصال نانوذرات تیتانیا و نقره به بدنه نانولوله‌ها با استفاده از گروه عاملی کربوکسیل را تایید کرد. مشاهده شد که هیبریدهای سه‌گانه فعالیت آنتی‌باکتریال بسیار بهتری در مقایسه با هیبریدهای دوگانه و نانوذرات تنها از خود نشان می‌دهند و در بین باکتری‌های مذکور، نانومواد سنتز شده بیشترین تاثیر را روی باکتری اشریشیا کلای داشته‌اند. بیشینه ناحیه عدم رشد برابر mm 13 است که با استفاده از هیبرید CTA4 در برابر باکتری استافیلوکوک اپیدرمیدیس در حجم μl 40 از باکتری بدست آمد. پرونده مقاله -
دسترسی آزاد مقاله
14 - جذب سطحی فلز سرب از محلول آبی توسط نانوذرات هسته-پوسته Fe3O4@MnO2 به روش سطح پاسخ
امیر اشرفی احمد رهبر کلیشمی هادی شایستهدر این پژوهش، توانایی نانوذرات هسته-پوسته Fe3O4@MnO2 به عنوان یک جاذب سنتزی برای حذف یون سرب از محلول آبی بررسی شد. روش طراحی سطح پاسخ بر مبنای طراحی باکس- بنکن به منظور تعیین اثرات غلظت اولیه، زمان تماس و مقدار جاذب مورد استفاده قرار گرفت. نتایج روش آماری نشان داد که چکیده کاملدر این پژوهش، توانایی نانوذرات هسته-پوسته Fe3O4@MnO2 به عنوان یک جاذب سنتزی برای حذف یون سرب از محلول آبی بررسی شد. روش طراحی سطح پاسخ بر مبنای طراحی باکس- بنکن به منظور تعیین اثرات غلظت اولیه، زمان تماس و مقدار جاذب مورد استفاده قرار گرفت. نتایج روش آماری نشان داد که جذب یون سرب بر نانوذرات هسته-پوسته Fe3O4@MnO2 به خوبی مدل شد. همچنین نتایج دارای تکرارپذیری مناسبی بودند و شرایط بهینه جذب یون سرب در pH برابر 6، غلظت اولیه یون سرب mg/L 250، زمان تعادلی 20 دقیقه و مقدار جاذب g/L 5/0 حاصل شد. داده‌های تعادلی همچنین به دقت توسط همدماهای لانگمویر، فرندلیچ و تمکین انطباق داده شد و نتایج نشان داد که داده‌های همدما از مدل لانگمویر به خوبی تبعیت می‌کنند. پرونده مقاله -
دسترسی آزاد مقاله
15 - بررسی اثر ماده فعال کننده سطح بر ویژگی‌های نانوذرات Fe3O4
مونا عبادی ابراهیم قاسمیدر این تحقیق، نانوذرات Fe3O4 با استفاده از روش همرسوبی تهیه و تاثیر غلظت اسید لاریک به عنوان ماده فعال کننده سطح بر اندازه ذرات و ویژگی‌های مغناطیسی آنها مورد بررسی قرار گرفت. برای بدست آوردن این نانوذرات، کلریدهای آهن دو و سه ظرفیتی با تنظیم pH توسط آمونیاک در حضور مقا چکیده کاملدر این تحقیق، نانوذرات Fe3O4 با استفاده از روش همرسوبی تهیه و تاثیر غلظت اسید لاریک به عنوان ماده فعال کننده سطح بر اندازه ذرات و ویژگی‌های مغناطیسی آنها مورد بررسی قرار گرفت. برای بدست آوردن این نانوذرات، کلریدهای آهن دو و سه ظرفیتی با تنظیم pH توسط آمونیاک در حضور مقادیر مختلف اسید لاریک رسوب داده شد. برای بررسی توزیع اندازه ذرات از روش تفرق دینامیکی لیزری (DLD) استفاده شد. ساختار و مورفولوژی ذرات به ترتیب با استفاده از آنالیز پراش اشعه ایکس (XRD) و میکروسکوپ الکترونی روبشی (SEM) بررسی شد. خاصیت مغناطیسی ذرات با استفاده از روش گرادیان نیروی متغیر مغناطیسی (AGFM) اندازه‌گیری شد. نتایج XRD نشان داد امکان تشکیل فاز فرعی e–Fe2O3 در کنار Fe3O4 وجود دارد که وابسته به غلظت ماده فعال کننده سطح است و در غلظت بهینه اسید لاریک هیچ فاز فرعی دیده نشد. بررسی‌های AGFM مشخص کرد که با افزایش غلظت اسید لاریک، اشباع مغناطیس کاهش می‌یابد. بعلاوه مشخص شد که اندازه بلورک‌ها، از 10 تا 22 نانومتر تغییر می‌کند. پرونده مقاله -
دسترسی آزاد مقاله
16 - حذف متیلن بلو به کمک جذب سطحی توسط نانوکامپوزیت مغناطیسی Fe3O4@GT
حسین عباس تبار علی زندی علی صفاریکی از مسائل زیست محیطی روز، ایجاد پساب های حاوی رنگ های آلی توسط صنایع رنگرزی می باشد. این آلاینده ها آسیب های بسیاری را برای انسان و دیگر موجودات به وجود آورده است. در این پروژه نانوکامپوزیت Fe3O4@GT توسط نانوذرات مغناطیسی Fe3O4 و کتیرا سنتز شدند. صمغ کتیرا به عنوان ج چکیده کاملیکی از مسائل زیست محیطی روز، ایجاد پساب های حاوی رنگ های آلی توسط صنایع رنگرزی می باشد. این آلاینده ها آسیب های بسیاری را برای انسان و دیگر موجودات به وجود آورده است. در این پروژه نانوکامپوزیت Fe3O4@GT توسط نانوذرات مغناطیسی Fe3O4 و کتیرا سنتز شدند. صمغ کتیرا به عنوان جزء مهم و کاربردی برای بهبود سرعت جذب استفاده شد. سپس به کمک این نانوکامپوزیت کیفیت حذف متیلن بلو بررسی شد. شرایطی مانند میزان جاذب، میزان متیلن بلو، pH محیط و دمای محیط در کیفیت حذف متیلن بلو بررسی شد و برای یافتن نتایج بهینه از روش تاگوچی استفاده شد. XRD، FTIR، DLS، SEM، و VSM برای تجزیه و تحلیل نمونه استفاده شد. نتایج FTIR وجود گروه های عاملی هیدروژل کتیرا را در سطح نانوذرات ثابت کرد. اندازه ذرات نانوکامپوزیت به دست آمده با روشDLS، 24/96 نانومتر و مقدار VSM برای نانوکامپوزیت 33/31 emu/g به دست آمد. شرایط بهینه جاذب در pH قلیایی بود و مقدار زیاد آلاینده درصد جذب را کاهش داد. افزایش دمای محیط باعث بهبود جذب شد. مشخص شد که نانوکامپوزیت Fe3O4@GT دارای عملکرد جذب بالایی بر روی متیلن بلو با نرخ حذف 4/86 درصد بعد از گذشت 4 ساعت است. پرونده مقاله -
دسترسی آزاد مقاله
17 - Reduced Biofilm Formation of Pseudomonas Aeruginosa by Silver Modified Iron Oxide
Davoud kabudanian Raheleh Safaei javan Shohreh Zare kariziObjectives and Background: Pseudomonas aeruginosa (P. aeruginosa) is a nosocomial opportunistic pathogen. Considering the importance of biofilm in pathogenicity and resistance of these bacteria, efforts should be made to find new antibacterial compounds.Methods: The Fe3 چکیده کاملObjectives and Background: Pseudomonas aeruginosa (P. aeruginosa) is a nosocomial opportunistic pathogen. Considering the importance of biofilm in pathogenicity and resistance of these bacteria, efforts should be made to find new antibacterial compounds.Methods: The Fe3O4 nanoparticles were synthesized by the co-precipitation method and were modified by the AgNO3 reductive solution to investigate influencing of Ag-Fe3O4 nanoparticles on biofilm formation of P. aeruginosa. The synthesized nanoparticles properties were determined by FESEM, DLS, FTIR, XRD and Zeta potential tests. Results: FESEM and DLS revealed the cubic and smooth structure with average size of 44.36 nm. XRD analyzes confirmed the presence of magnetite core. FTIR spectrum determined the existence of silver plating on the magnetic surface. The Zeta potential results indicated that the magnetic nanoparticle’s surface net charge was 24.4 and the surface net charge for silver modified nanoparticles was -28.3. Finally, after separating 40 isolates of P. aeruginosa among 82 clinical isolates as strong biofilm producers, then the inhibitory effect of synthesised Ag- Fe3O4 nanoparticles on the formation of biofilms was studied using the broth micro-dilution method.Conclusions: Accordingly, it was proved that Ag-Fe3O4 nanoparticles can be used to treat biofilm infections and were introduced as the new antimicrobial agents پرونده مقاله -
دسترسی آزاد مقاله
18 - One-pot synthesis of Ag/Fe3O4 nanocomposite: Preparation, characterization and efficient catalyst
Babak SadeghiIn this study, nanometer sized of Ag/Fe3O4 nanocomposite (AFN) have been synthesized by using a simple and based on chemical reduction method. The size and shape of (AFN) controlled by using of condensation (Fe2O3 (2.975 mmol), NaBH4 (21.25 mmol), AgNO3 (2.532 mmol) and چکیده کاملIn this study, nanometer sized of Ag/Fe3O4 nanocomposite (AFN) have been synthesized by using a simple and based on chemical reduction method. The size and shape of (AFN) controlled by using of condensation (Fe2O3 (2.975 mmol), NaBH4 (21.25 mmol), AgNO3 (2.532 mmol) and polyvinylpyrrolidone (PVP) (8.925 mmol K30 Mr=10.000) in 40 ºC. The synthesized AFN was characterized by XRD, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron diffraction X-ray (EDX) spectral techniques. Measurements of X-ray diffraction (XRD) confirm that Ag/Fe3O4 nanocomposite have the crystalline structure. The scanning electron microscopy (SEM) images of the as-deposited Ag/Fe3O4 nanocomposite (AFN) have been shown that the particles aggregate into an organized spherical structure, which is characterized by diameter of 10-20 nm. This type of porous aggregate is characterized by large surface area, which could have potential applications in the areas of catalysis and filtration. The population distribution as measured from the TEM images shows the average particle size for the AFN nanocomposite is 10-20 nm. پرونده مقاله -
دسترسی آزاد مقاله
19 - Schiff base functionalized Fe3O4@Boehmite Core-Shell Nano-Particles to Support MoO2(acac)2 for Catalytic Epoxidation of Alkenes
Mahdi Mirzaee Bahram Bahramian Mohadeseh HematianFe3O4 nanoparticles were prepared solvothermally and then covered with boehmite shell via hydrothermal assisted sol-gel processing of aluminum 2-propoxide. Then the hydroxyl covered outer surface of the boehmite shell was covalently functionalized with 3-(tri-methoxysil چکیده کاملFe3O4 nanoparticles were prepared solvothermally and then covered with boehmite shell via hydrothermal assisted sol-gel processing of aluminum 2-propoxide. Then the hydroxyl covered outer surface of the boehmite shell was covalently functionalized with 3-(tri-methoxysilyl) propylamine and the terminal amine groups converted to imine by refluxing with 2-hydroxybenzaldehyde. Then it was used to support bis-acetylacetonato-di-oxo-molybdenum (VI). The supported catalyst was characterized by Fourier transform Infrared spectroscopy, elemental analysis, inductive coupled plasma and transmission electron microscopy analysis and it was applied in the epoxidation of cis-cyclooctene. The catalytic procedure was optimized for different parameters such as solvent, oxidant, and temperature. The reaction progress was investigated by gas-liquid chromatography analysis. The used catalyst was simply recovered from the solution by applying a magnet and recycling experiments revealed that this heterogeneous nano-catalyst could be repeatedly applied for the epoxidation of cis-cyclooctene. The optimized conditions were also used for the epoxidation of some other alkenes successfully. پرونده مقاله -
دسترسی آزاد مقاله
20 - A Biosensor for the Detection of Type b3a2 Related to Chronic Myelogenous Leukemia by Using Locked Nucleic Acid, Molecular Switching, Magnetic Nanoparticles, and Enzymatic Signal Amplification
Hamzeh Amoshahi Mohammad Reza Mohammad Shafiee Shabnam Kermani Mehrosadat MirmohammadiA novel electrochemical method was developed for the detection of Type b3a2 (BCR/ABL gene) as a biomarker of Chronic Myelogenous Leukemia that is based on the use of locked nucleic acid incorporating LNA switching, Fe3O4 nanoparticles (NPS), and enzymatic signal amplifi چکیده کاملA novel electrochemical method was developed for the detection of Type b3a2 (BCR/ABL gene) as a biomarker of Chronic Myelogenous Leukemia that is based on the use of locked nucleic acid incorporating LNA switching, Fe3O4 nanoparticles (NPS), and enzymatic signal amplification. The quality of the biosensor was proven by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and electrochemical impedance spectroscopy tests. The LNA probe was modified by NH2 and biotin at its 3-end and 5-end, respectively. After unfolding the loop-and-stem structure of the probe, it was hybridized with Type b3a2, which makes the biotin stay away from the surface of Fe3O4 NPS. Type b3a2 can be evaluated quantitatively using electrochemical detection of the benzoquinone enzymatic product with the presence of H2O2 and hydroquinone via the particular interaction between SA-HRP and biotin. Particular and selective Type b3a2 detection was obtained over an extensive concentration range from 50 femtometer (fM) to 5 micrometer (µM) in a low limit of detection of 17 fM via the biosensor. پرونده مقاله -
دسترسی آزاد مقاله
21 - Magnetic solid-phase extraction and Uv/vis Spectrophotometric determination of trace amount of Copper in vegetable and fruit samples after preconcentration of its Pentetate complex
Hojjat Veisi Fatemeh Parvizi Mohammad Reza AbdiCore-shell nanostructured Magnetite@polydopamine (Fe3O4@PDA) nanoparticles have been successfully synthesized and was characterized by FT-IR, TEM, FE-SEM, XRD, EDX, Raman Spectroscopy, VSM and Zeta potential. The effects of different parameter on the sorption of complex چکیده کاملCore-shell nanostructured Magnetite@polydopamine (Fe3O4@PDA) nanoparticles have been successfully synthesized and was characterized by FT-IR, TEM, FE-SEM, XRD, EDX, Raman Spectroscopy, VSM and Zeta potential. The effects of different parameter on the sorption of complex copperpentetate (CuDTPA) on Fe3O4@PDA were investigated by using Box-Behnken design for Spectrophotometric determination of trace amount of Copper in vegetable and fruit samples after preconcentration of its Pentetic complex. Under optimal experimental conditions, L.R., LOD and LOQ of Cu (II) was 2-700 µg.L-1, 0.0146 µg.L-1 and 0.0487 µg.L-1 respectively. The Preconcentration Factor 100 was obtained. Low relative standard deviations (RSD=0.7 %) for 10 replicates are achieved. The method was applied to the determination of trace amount of Cu (II) in food samples and the results showed that no significant difference between the proposed method and Flame Atomic Absorption Spectroscopy.Core-shell nanostructured Magnetite@polydopamine (Fe3O4@PDA) nanoparticles have been successfully synthesized and was characterized by FT-IR, TEM, FE-SEM, XRD, EDX, Raman Spectroscopy, VSM and Zeta potential. The effects of different parameter on the sorption of complex copperpentetate (CuDTPA) on Fe3O4@PDA were investigated by using Box-Behnken design for Spectrophotometric determination of trace amount of Copper in vegetable and fruit samples after preconcentration of its Pentetic complex. Under optimal experimental conditions, L.R., LOD and LOQ of Cu (II) was 2-700 µg.L-1, 0.0146 µg.L-1 and 0.0487 µg.L-1 respectively. The Preconcentration Factor 100 was obtained. Low relative standard deviations (RSD=0.7 %) for 10 replicates are achieved. پرونده مقاله -
دسترسی آزاد مقاله
22 - Experimental Investigation of Fe3O4-Chitosan Nanocomposite as a Nano-Demulsifier for Water in Crude Oil Separation
Zahra Hasanshahi Payam Parvasi Mohamad Mahdi Zerafat Samad SabbaghiNowadays chemical and electrostatic demulsification techniques are typically used to separate water-in-crude-oil emulsions. The need to improve demulsification techniques has led to the use of various additives among which nanoparticles have emerged as a novel alternati چکیده کاملNowadays chemical and electrostatic demulsification techniques are typically used to separate water-in-crude-oil emulsions. The need to improve demulsification techniques has led to the use of various additives among which nanoparticles have emerged as a novel alternative. Most of the exploited crude oils exist in an emulsion state, where may cause serious problems during processing. Chemical demulsifiers, bottle tests, and electrostatic desalters are commonly used to separate water from crude oil emulsions but there are some issues involved with these methods. Therefore, using new technologies like nanotechnology can help improve the desalting process. First, Fe3O4 and Fe3O4-chitosan nanocomposite were synthesized via the co-precipitation method. Fe3O4-chitosan nanoparticles were characterized by X-ray diffraction and Fourier transform infrared spectroscopy. The results showed that ultrafine Fe3O4 nanoparticles were prepared and coated by chitosan. In this study, Fe3O4 and Fe3O4-chitosan nanocomposite were utilized to improve emulsion destabilization. The effect of different parameters on the separation performance was studied and the best conditions were determined. The results showed that the application of certain nanostructures in crude oil emulsions improves the performance of demulsification up to 86% and decreases the amount of demulsifier consumption in the desalting process. پرونده مقاله -
دسترسی آزاد مقاله
23 - Spectroscopic studies on the interaction of Fe3O4@Ca Al LDH@Lamivudine with the calf thymus DNA
nahid shahabadi mahtab razlansari Avat (Arman) TaherpourIn this study, we were synthesized and characterized of Fe3O4@LDH@Lamivudine by FT-IR spectroscopy, XRD and TEM. The interaction of this nanoparticle with CT-DNA was investigated by viscosity, circular dichroism (CD), Uv-visible and fluorescence spectroscopy. Among all چکیده کاملIn this study, we were synthesized and characterized of Fe3O4@LDH@Lamivudine by FT-IR spectroscopy, XRD and TEM. The interaction of this nanoparticle with CT-DNA was investigated by viscosity, circular dichroism (CD), Uv-visible and fluorescence spectroscopy. Among all nanocarriers which applied as drug delivery vectors Layered double hydroxides (LDHs) with exchangeable anions in the positive brucite-like interlayers have been attracting much attentions in the field of cellular delivery of anionic drug and other bio-functional molecules, due to their low toxicity, biocompatibility, high stability, pH dependent solubility and enhanced cellular uptake behavior compared with the conventional drug carriers. UV–Visible absorption studies indicated hyperchromism with the binding constant of 4.9×103 M-1. In the fluorimetric investigation, this nanocomposite can bind to DNA and creates a new non-fluorescence adduct. The thermodynamic parameters (ΔH پرونده مقاله -
دسترسی آزاد مقاله
24 - Removal of Cd2+ and Zn2+ from industrial wastes using novel magnetic N2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide nanoadsorbent
Kiomars Zargoosh Mohammad Rasoul Sohrabi Amir Abdolmaleki Kourosh FirouzIn this workN2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide (DPD), was synthesized via reaction of 2-aminothiazole and 2,6- pyridinedicarboxylic acid in n-methylpyrrolidine. The obtained (DPD) was characterized with nuclear magnetic resonance spectroscopy (NMR), Fourie چکیده کاملIn this workN2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide (DPD), was synthesized via reaction of 2-aminothiazole and 2,6- pyridinedicarboxylic acid in n-methylpyrrolidine. The obtained (DPD) was characterized with nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared (FT-IR) spectroscopy, and elemental analysis. Finally, a novel magnetic nanoadsorbent was synthesized by modification the surface of Fe3O4 nanoparticles by N2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide. The prepared magnetic nanoadsorbent was successfully used for removal of Zn2+ and Cd2+ ions from industrial wastes and the effects of the affecting parameters such as pH, possible interfering ions, contact time, concentration of target ions, background electrolytes and temperature were investigated. The maximum adsorption capacities of Zn2+ and Cd2+ were found to be 149.2 and 112.4 mg g−1, respectively. The required times for quantitative removal of Zn2+ and Cd2+ were 30 and 45 min, respectively. Appropriate characteristics of the proposed nanoadsorbent such as high adsorption capacity, stability, reusability, easy synthesis and easy separation, make it suitable adsorbent for practical removal of Zn2+ and Cd2+ ions from industrial wastes. پرونده مقاله -
دسترسی آزاد مقاله
25 - Experimental Investigation of Fe3O4-Chitosan Nanocomposite as a Nano-Demulsifier for Water in Crude Oil Separation
Z. Hasanshahi P. Parvasi M. M. Zerafat Samad SabbaghiNowadays chemical and electrostatic demulsification techniques are typically usedto separate water-in-crude-oil emulsions. The need to improve demulsificationtechniques has led to the use of various additives among which nanoparticleshave emerged as a novel alternative. چکیده کاملNowadays chemical and electrostatic demulsification techniques are typically usedto separate water-in-crude-oil emulsions. The need to improve demulsificationtechniques has led to the use of various additives among which nanoparticleshave emerged as a novel alternative. Most of the exploited crude oil exists in anemulsion state, where may cause serious problems during processing. Chemicaldemulsifiers, bottle tests, and electrostatic desalters are commonly used toseparate water from crude oil emulsions but there are some issues involved withthese methods. Therefore, using new technologies like nanotechnology can help improve the desalting process. First, Fe3O4 and Fe3O4-chitosan nanocompositewere synthesized via co-precipitation method. Fe3O4-chitosan nanoparticles werecharacterized by X-ray diffraction and Fourier transform infrared spectroscopy.The results showed that ultrafine Fe3O4 nanoparticles were prepared and coatedby chitosan. In this study, Fe3O4 and Fe3O4-chitosan nanocomposite were utilizedto improve emulsion destabilization. The effect of different parameters on theseparation performance was studied and the best conditions were determined.The results showed that the application of certain nanostructures in crude oilemulsions improves the performance of demulsification up to 86% and decreasesthe amount of demulsifier consumption in the desalting process. پرونده مقاله -
دسترسی آزاد مقاله
26 - Magnetic solid-phase extraction and Uv/vis Spectrophotometric determination of trace amount of Copper in vegetable and fruit samples after preconcentration of its Pentetate complex
Hojjat Veisi Fatemeh Parvizi Mohammad Reza AbdiCore-shell structure Magnetite@polydopamine (Fe3O4@PDA) nanoparticles have been successfully synthesized and were characterized by FT-IR, TEM, FE-SEM, XRD, EDX, Raman Spectroscopy, VSM and Zeta potential. The effects of the different parameter on copperpentetate complex چکیده کاملCore-shell structure Magnetite@polydopamine (Fe3O4@PDA) nanoparticles have been successfully synthesized and were characterized by FT-IR, TEM, FE-SEM, XRD, EDX, Raman Spectroscopy, VSM and Zeta potential. The effects of the different parameter on copperpentetate complex (CuDTPA) sorption on Fe3O4@PDA were investigated by using Box-Behnken design for Spectrophotometric determination of trace amount of Copper in vegetable and fruit samples after preconcentration of its Pentetic complex. Under optimal experimental conditions, L.R., LOD, and LOQ of Cu (II) were 2-700 µg.L-1, 0.0146 µg.L-1 and 0.0487 µg.L-1 respectively. The Preconcentration Factor 100 was obtained. Low relative standard deviations (RSD=0.7 %) for 10 replicates are achieved. The method was applied to the determination of trace amount of Cu (II) in food samples and the results showed that no significant difference between the proposed method and Flame Atomic Absorption Spectroscopy. پرونده مقاله -
دسترسی آزاد مقاله
27 - Cross-linked sulfonated polyacrylamide (Cross-PAA-SO3H) attached to nano-Fe3O4 as a superior catalyst for the synthesis of oxindoles
Hossein Shahbazi-Alavi Javad Safaei-GhomiCross-linked sulfonated polyacrylamide (Cross-PAA-SO3H) attached to nano-Fe3O4 as an efficientheterogeneous solid acid catalyst has been used for the preparation of spiro[pyrazoloquinoline-oxindoles]and spiro[chromenopyrazolo-oxindoles] through a four-component reaction چکیده کاملCross-linked sulfonated polyacrylamide (Cross-PAA-SO3H) attached to nano-Fe3O4 as an efficientheterogeneous solid acid catalyst has been used for the preparation of spiro[pyrazoloquinoline-oxindoles]and spiro[chromenopyrazolo-oxindoles] through a four-component reactions of phenylhydrazineor hydrazine hydrate, isatins, ketoesters and naphthylamine or 2-naphthol under reflux conditions inethanol. The remarkable advantages of this methodology are easy work-up, short reaction times, highto excellent product yields, operational simplicity, low catalyst loading and reusability of the catalyst. پرونده مقاله -
دسترسی آزاد مقاله
28 - Spectroscopic studies on the interaction of Fe3O4@CaAl LDH@Lamivudine with the calf thymus DNA
Nahid Shahabadi Mahtab Razlansari Avat (Arman) TaherpourIn this study, we were synthesized Fe3O4@LDH@Lamivudine and characterized by FT-IR spectroscopy,XRD and TEM. The interaction of this nanoparticle with CT-DNA was investigated by viscosity, circulardichroism (CD), Uv-Visible and fluorescence spectroscopy. Among all nanoc چکیده کاملIn this study, we were synthesized Fe3O4@LDH@Lamivudine and characterized by FT-IR spectroscopy,XRD and TEM. The interaction of this nanoparticle with CT-DNA was investigated by viscosity, circulardichroism (CD), Uv-Visible and fluorescence spectroscopy. Among all nanocarriers which applied as drugdelivery vectors, layered double hydroxides (LDHs) with exchangeable anions in the positive brucitelikeinterlayers have been attracting much attentions in the field of cellular delivery of anionic drug andother bio-functional molecules, due to their low toxicity, biocompatibility, high stability, pH dependentsolubility and enhanced cellular uptake behavior compared with the conventional drug carriers. UVVisibleabsorption studies indicated hyperchromism with the binding constant of 4.9×103 M-1. In thefluorimetric investigation, this nanocomposite can bind to DNA and creates a new non-fluorescenceadduct. The thermodynamic parameters (ΔHand nanocomposite is hydrogen bond and Vander-Waals force. The process of binding was spontaneous,in which Gibbs free energy change (ΔG) was negative. Furthermore, viscosity measurements did not showany changes by increasing the amount of the mentioned nanocomposite. In Circular dichroism, bothpositive and negative bands illustrate little changes, which imply a non-intercalative mode of binding. Theexperimental results demonstrated that Fe3O4@LDH@Lamivudine interact with DNA by groove bindingmode. As an evidenced, increasing the fluorescence intensity of Hoechst–DNA solutions in the presence ofdifferent amounts of Fe3O4@LDH@Lamivudine nanoparticles are able to displace the Hoechst molecules,which was grooved into DNA completely as to indicate groove binding mode. پرونده مقاله -
دسترسی آزاد مقاله
29 - Green synthesis of oxazole triazole derivatives: Application of Fe3O4@MWCNT MNCs
Samaneh Sadat Sharifi Seyyed Jalal Shams Najafi Majid Ghazanfarpour1,3-oxazole derivatives were prepared via multicomponent reaction of α-bromo ketones, acid chlorides andammonium thiocyanate in the presence of catalytic amount of Fe3O4@MWCNT MNCs in water at 50oC in good yields. Also, the reaction of alkyl (aryl) isothiocyanates چکیده کامل1,3-oxazole derivatives were prepared via multicomponent reaction of α-bromo ketones, acid chlorides andammonium thiocyanate in the presence of catalytic amount of Fe3O4@MWCNT MNCs in water at 50oC in good yields. Also, the reaction of alkyl (aryl) isothiocyanates and -bromo ketones in the presence of catalytic amount of Fe3O4 MNPs in water at 50oC are investigated. The catalyst was reused five times with minor decrease in its catalytic activity. In addition, high yields, easy procedure, easy separation of catalyst from the mixture of reactions are the advantages of these reactions. پرونده مقاله -
دسترسی آزاد مقاله
30 - Synthesis of some chiral compounds using (MWCNTs)-COOH/Fe3O4-CaO magnetic nanostructures
Omekolsoom Shabani Navabeh Nami Rahimeh Hajinasiri Masoumeh HosseinzadehThe condensation of dimedone with sugars in the presence of a catalytic amount of (MWCNTs)-COOH/Fe3O4-CaO magnetic nanostructure gave some asymmetric furan derivatives in good yields. The products were identified by FT-IR, NMR spectra, and elemental analysis.The condensation of dimedone with sugars in the presence of a catalytic amount of (MWCNTs)-COOH/Fe3O4-CaO magnetic nanostructure gave some asymmetric furan derivatives in good yields. The products were identified by FT-IR, NMR spectra, and elemental analysis. پرونده مقاله -
دسترسی آزاد مقاله
31 - Magnetic nanosphere Fe3O4@SiO2.SnCl4 promoted synthesis of 5-substituted 1H-tetrazoles
Bi Bi Fatemeh Mirjalili Hadise Jorsarraie Hamidreza AkramiTetrazoles have many interesting futures and applications in drug and energy industries. 5-Substituted 1H-tetrazoles were synthesized via [2+3] cycloaddition reaction of aryl or alkyl nitriles with sodium azide in the presence of Fe3O4@SiO2.SnCl4 as catalyst in DMF unde چکیده کاملTetrazoles have many interesting futures and applications in drug and energy industries. 5-Substituted 1H-tetrazoles were synthesized via [2+3] cycloaddition reaction of aryl or alkyl nitriles with sodium azide in the presence of Fe3O4@SiO2.SnCl4 as catalyst in DMF under reflux conditions. The catalyst was removed from reaction mixture by an external magnet and was reusable for many times without any appreciable loss of its activity. The Fe3O4@SiO2.SnCl4 promotes synthesis of tetrazole in shorter time than other reported catalysts. The obtained tetrazoles were identified by spectroscopic and physical data such as FT-IR, 1HNMR and melting point. Easy workup and reusability of catalyst are some advantages of this protocol. پرونده مقاله -
دسترسی آزاد مقاله
32 - Nano cotton-shape mesoporous (NCSM) modified by Fe3O4: Green, magnetic and reusable catalytic system for dechlorization of bromothymol blue (BTB)
Hamid AliyanFe3O4-containing cotton-like mesoporous silica system (Fe3O4@NCSM) was studied with regard to its performance towards the photodecolorization of bromothymol blue (BTB) aqueous solution. The surface properties of the functionalized catalyst were analyzed by a series of c چکیده کاملFe3O4-containing cotton-like mesoporous silica system (Fe3O4@NCSM) was studied with regard to its performance towards the photodecolorization of bromothymol blue (BTB) aqueous solution. The surface properties of the functionalized catalyst were analyzed by a series of characterization techniques like FTIR, XRD, BET, SEM and TEM. The N2 Adsorption–desorption analysis shows that the mesostructure of silica remains intact after Fe3O4 modifications, while the spectral technique shows the successful encapsulating of the neat Fe3O4 inside the porous silica support. The optimum values of the experimental parameters which affect the degradation efficiency were obtained as: 0.15 g L−1 of the photocatalyst, 25 ppm dye concentration and pH 5.6. پرونده مقاله -
دسترسی آزاد مقاله
33 - Fe3O4@SiO2 nanoparticles: An efficient, green and magnetically reusable catalyst for the one-pot synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-dione derivatives
Mohammad Ali Ghasemzadeh Mina Azimi-Nasrabad Javad Safaei-GhomiAn efficient and eco-friendly method for the one-pot synthesis of 14-aryl-14H-dibenzo [a,i]xanthene-8,13-dione derivatives has been developed in the presence of Fe3O4@SiO2 core-shell nanoparticles. The multi-component reactions of 2-hydroxy-1,4-naphthoquinone, β-na چکیده کاملAn efficient and eco-friendly method for the one-pot synthesis of 14-aryl-14H-dibenzo [a,i]xanthene-8,13-dione derivatives has been developed in the presence of Fe3O4@SiO2 core-shell nanoparticles. The multi-component reactions of 2-hydroxy-1,4-naphthoquinone, β-naphthol and aldehydes were efficiently catalyzed using novel nano-scale materials under reflux conditions. The present method offers several advantages such as environmentally benign, simple work-up, excellent yield of products, short reaction times, little catalyst loading and facile catalyst separation. The nanomagnetic catalyst could be readily recovered using a simple external magnet and reused several times without any significant loss in activity. The catalyst was fully characterized by FT-IR, SEM, XRD, EDX and VSM analysis. پرونده مقاله -
دسترسی آزاد مقاله
34 - Fe3O4@FSM-16-SO3H as a new magnetically recyclable nanostructured catalyst: synthesis, characterization and catalytic application for the synthesis of pyrano[2,3-c]pyrazoles
Somayeh Hashemi-Uderji Mohammad Abdollahi-Alibeik Reza Ranjbar-KarimiA three-component process for the one-pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles is described by the three-component reaction of aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one and malononitrile in the presence of Fe3O4 چکیده کاملA three-component process for the one-pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles is described by the three-component reaction of aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one and malononitrile in the presence of Fe3O4@FSM-16-SO3H as an efficient magnetically recyclable mesoporous catalyst. Folded sheet mesoporous material (FSM-16) was prepared by intercalation of a layered, kanemite type sodium silicate with cetyltrimethylammonium (CTMA) ions in the presence of dispersed Fe3O4. The Fe3O4@FSM-16-SO3H was synthesized by sulfonation of Fe3O4@FSM-16 and characterized by FESEM, XRD, BET, VSM and FT-IR techniques. This protocol suggests benefits in terms of higher yields and short reaction time. In addition, the catalyst could be separated using an external magnet and is reusable many times without any significant loss of activity. پرونده مقاله -
دسترسی آزاد مقاله
35 - Synthesis, characterization and catalytic application of Fe3O4@Cys–SO3H for preparation of 2H-indazolo[1,2-b]phthalazine-triones
Somaye Nikzad Shalkouhi Hassan Kefayati Shahab ShariatiThe surface ofFe3O4 magnetic nanoparticles (MNPs) was modified by L-cysteine through condensation of COOH groups of L-cysteine and OH groups on the surface of Fe3O4. The –SH group of preparedFe3O4@Cys MNPs oxidized to –SO3H group and Fe3O4@Cys–SO3H as چکیده کاملThe surface ofFe3O4 magnetic nanoparticles (MNPs) was modified by L-cysteine through condensation of COOH groups of L-cysteine and OH groups on the surface of Fe3O4. The –SH group of preparedFe3O4@Cys MNPs oxidized to –SO3H group and Fe3O4@Cys–SO3H as an environmentally friendly magnetic nanoparticle was prepared. The MNPs were characterized by FT-IR, XRD, SEM and TEM studies. Then, the catalytic activity of the MNPs was evaluated as an effective and reusable catalyst for one-pot synthesis of 2H‐indazolo [1,2‐b] phthalazine‐triones derivatives. The results show that the catalytic activity of Fe3O4@Cys–SO3H was comparable to that of other reported heterogeneous and homogeneous catalysts. پرونده مقاله -
دسترسی آزاد مقاله
36 - Nano-Fe3O4@ZrO2-SO3H as highly efficient recyclable catalyst for the green synthesis of fluoroquinolones in ordinary or magnetized water
Ahmad Nakhaei Abolghasem Davoodnia Sepideh YadegarianCore–shell zirconia-coated magnetite nanoparticle bearing sulfonic acid groups (nano-Fe3O4@ZrO2-H3PO4) have been prepared and used as an efficient acid catalyst in the synthesis of fluoroquinolons by the direct amination of 7-halo-6- fluoroquinolone-3-carboxylic a چکیده کاملCore–shell zirconia-coated magnetite nanoparticle bearing sulfonic acid groups (nano-Fe3O4@ZrO2-H3PO4) have been prepared and used as an efficient acid catalyst in the synthesis of fluoroquinolons by the direct amination of 7-halo-6- fluoroquinolone-3-carboxylic acids with variety of piperazine derivatives and (4aR,7aR)-octahydro-1H-pyrrolo[3,4-b] pyridine. The reaction was carried out in the ordinary or magnetized water as a solvent. In the final outcomes, the nano-Fe3O4@ZrO2-SO3H showed good catalytic performance in the both forms of water. However, the magnetized water showed better results. Therefore, this new procedure provides prompt achievement to the appropriate products with acceptable yields in water as a green solvent at reflux situations with an easy work‐up process. Furthermore, the catalyst was recyclable and could be reused at least three times without any discernible loss in its catalytic activity. پرونده مقاله -
دسترسی آزاد مقاله
37 - Fe3O4/FDU-12: A highly efficient and magnetically separable nano-catalyst for oxidation of alcohols
Najme Kalvari Janaki Razieh Fazaeli Hamid AliyanA series of Fe3O4 supported on mesoporous FDU-12 silica systems were prepared by the hydrothermal conditions. The surface properties of the functionalized catalyst were analyzed by a series of characterization techniques like FTIR, XRD, N2 adsorption–desorption an چکیده کاملA series of Fe3O4 supported on mesoporous FDU-12 silica systems were prepared by the hydrothermal conditions. The surface properties of the functionalized catalyst were analyzed by a series of characterization techniques like FTIR, XRD, N2 adsorption–desorption and TEM. XRD and adsorption–desorption analysis shows that the mesostructure of FDU silica remains intact after Fe3O4 modifications, while spectral technique show the successful immobilizing of the neat Fe3O4 inside the porous silica support. Fe3O4/FDU-12 system, has emerged as highly efficient and magnetically recoverable heterogeneous catalyst for selective oxidation of alcohols with H2O2 at reflux conditions because of its high specific surface area, tuneable pore size, and unique structure. The advantages of this catalytic system is mild reaction conditions, short reaction times, high product yields, easy preparation of the catalysts, non-toxicity of the catalysts, simple and clean work-up of the desired products. The wet catalyst can be removed easily, recovered and reused without significant loss of activity. پرونده مقاله -
دسترسی آزاد مقاله
38 - Nanomagnetite-Fe3O4 as a highly efficient, green and recyclable catalyst for the synthesis of 4,4´-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s
Abdolkarim Zare Fereshteh Abi Vahid Khakyzadeh Ahmad Reza Moosavi-Zare Alireza Hasaninejad Mahmoud ZareiNanomagnetite-Fe3O4 is used as a highly efficient, mild, green and recyclable nanomagnetite catalyst for the synthesis of 4,4´-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives in solvent-free conditions. The condensation reaction of 3-methyl-1-ph چکیده کاملNanomagnetite-Fe3O4 is used as a highly efficient, mild, green and recyclable nanomagnetite catalyst for the synthesis of 4,4´-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives in solvent-free conditions. The condensation reaction of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one with aromatic aldehydes affords the title compounds in high yields and short reaction times. The nanocatalyst is reusable for seven times without significant loss of its catalytic activity. Short reaction times, high yields, generality, efficiency, recyclability of the catalyst for seven times, simple purification, clean reaction, and agreement with the green chemistry protocols are some advantages of in this method. the catalyst was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM). پرونده مقاله -
دسترسی آزاد مقاله
39 - Fe3O4-chitosan nanoparticles as a robust magnetic catalyst for efficient synthesis of 5-substituted hydantoins using zinc cyanide
Javad Safari Leila JavadianIn this paper, Fe3O4-chitosan nanoparticles were prepared by the immobilization of chitosan on the surface of Fe3O4 nanoparticles. Then, the 5-substituted hydantoins were synthesized from the condensation of aldehyde derivatives, ammonium carbonate and zinc cyanide as a چکیده کاملIn this paper, Fe3O4-chitosan nanoparticles were prepared by the immobilization of chitosan on the surface of Fe3O4 nanoparticles. Then, the 5-substituted hydantoins were synthesized from the condensation of aldehyde derivatives, ammonium carbonate and zinc cyanide as a well-known cyanating agent by the magnetic Fe3O4-chitosan nanoparticles under neat conditions. Fe3O4-Chitosan nanocatalyst as a renewable hybrid catalyst was easily recovered by an external magnet and reused for 4 times without obvious drop in its catalytic activity. The purpose of this research was to provide an easy method for the synthesis of 5-substituted hydantoins in high yields and short reaction times by a robust and magnetic recoverable catalyst. پرونده مقاله -
دسترسی آزاد مقاله
40 - A simple and green approach for the synthesis of substituted dihydro-2-oxypyrroles catalyzed by nano-Fe3O4@SiO2/SnCl4 superparamagnetic nanoparticles
Bi Bi Fatemeh Mirjalili Reza Araqi Seyed Ahmad MohajeriIn this work, an efficient and green procedure for the synthesis of dihydro-2-oxypyrroles has been developed. One-pot four-component condensation reaction of aniline derivatives (2 mmol), dialkyl acetylene dicarboxylate (1 mmol), and aldehydes ( 1 mmol) was done in etha چکیده کاملIn this work, an efficient and green procedure for the synthesis of dihydro-2-oxypyrroles has been developed. One-pot four-component condensation reaction of aniline derivatives (2 mmol), dialkyl acetylene dicarboxylate (1 mmol), and aldehydes ( 1 mmol) was done in ethanol at 65 °C in the presence of nano-Fe3O4@SiO2/SnCl4 as a magnetically reusable heterogeneous acid catalyst. The obtained dihydro-2-oxypyrroles were purified without any chromatography techniques. The structure of obtained pure products was identified by physical properties and spectroscopic data such as FT-IR, 1H NMR, 13C NMR and mass spectroscopy. This protocol consistently has the advantages of excellent yields, short reaction time, simple workup, recyclability of the catalyst up to six runs without appreciable loss of activity. پرونده مقاله -
دسترسی آزاد مقاله
41 - Fe3O4@nano-dextrin/Ti(IV) as a bio-based magnetic nano-catalyst for facile synthesis of 2,3-dihydroquinazolin-4(1H)-ones
Elaheh Babaei Bi Bi Fatemeh MirjaliliA bio-based magnetic nano-catalyst (Fe3O4@nano-dextrin/Ti(IV)) was synthesized via the preparation of Fe3O4@nano-dextrinas magnetic support and then its treatment with titanium tetrachloride (TiCl4). The properties of this catalyst were characterized by different kinds چکیده کاملA bio-based magnetic nano-catalyst (Fe3O4@nano-dextrin/Ti(IV)) was synthesized via the preparation of Fe3O4@nano-dextrinas magnetic support and then its treatment with titanium tetrachloride (TiCl4). The properties of this catalyst were characterized by different kinds of techniques such as FT-IR, FESEM, TEM, ICP, XRF, VSM and TGA. As a first report, the catalytic activity of Fe3O4@nano-dextrin/Ti(IV) was investigated in the synthesisof 2,3-dihydroquinazolin-4(1H)-ones via condensation between 2-aminobenzamide and aldehyde under mild conditions. Good efficiency, a high percentage of product yields, simplicity of operation and easy recovery and reuse of catalyst are some benefits of this protocol. پرونده مقاله -
دسترسی آزاد مقاله
42 - One-pot sonochemical synthesis of benzopyranophenazines using nano Fe3O4@ PAA-SO3H
Javad Safaei-Ghomi Maryam Tavazo Hossein Shahbazi-AlaviA proper, atom-economical, straightforward one-pot multicomponent synthetic route for the synthesis of benzopyranophenazines has been presented by the reaction of hydroxynaphthoquinone, o-phenylenediamine, benzaldehydes, and malononitrile with crosslinked sulfonated pol چکیده کاملA proper, atom-economical, straightforward one-pot multicomponent synthetic route for the synthesis of benzopyranophenazines has been presented by the reaction of hydroxynaphthoquinone, o-phenylenediamine, benzaldehydes, and malononitrile with crosslinked sulfonated polyacrylamide (Cross-PAA-SO3H) attached to nano-Fe3O4as an efficient heterogeneous solid acid catalyst under ultrasonic irradiations in ethanol. Experimental simplicity, wide range of products, excellent yields in short reaction times and applying the sonochemical methodology as an efficient method and innocuous means of activation in synthetic chemistry for the preparation of medicinally privileged heterocyclic molecules are some of the important features of this method. The present catalytic procedure is extensible to a wide diversity of substrates for the synthesis of a variety-oriented library of benzopyranophenazines. پرونده مقاله -
دسترسی آزاد مقاله
43 - Synthesis, characterization and using Fe3O4@SiO2@FeCl3 as a new nanocatalyst for aza-Michael reaction between amines and ethyl crotonate
Hamid Parsa Mohammad Javad Taghizadeh Mojtaba Mossavi Jaber HosseiniIn this article, recyclable Fe3O4@SiO2@FeCl3 was synthesized and entirely characterized by various techniques including XRD, FT-IR, SEM, EDX and VSM analysis. The catalytic ability of produced Fe3O4@SiO2@FeCl3 was studied in the aza-Michael reaction of diethyl amine and چکیده کاملIn this article, recyclable Fe3O4@SiO2@FeCl3 was synthesized and entirely characterized by various techniques including XRD, FT-IR, SEM, EDX and VSM analysis. The catalytic ability of produced Fe3O4@SiO2@FeCl3 was studied in the aza-Michael reaction of diethyl amine and ethyl crotonate which lead to high yield of product. Also, this procedure was used to synthesize other derivatives resulted from different amines. Synthesized Fe3O4@SiO2@FeCl3 nanocatalyst has some great advantages such as easy preparation method, simple recovery and high efficiency. پرونده مقاله -
دسترسی آزاد مقاله
44 - Novel nanomagnetic material with dimethylamino tag: a selective and recyclable catalyst for the reaction of malononitrile, aryl aldehydes and dimedone
Aysoda Ghobadpoor Mohammad Mehdi Eskandari Abdolkarim Zare Mostafa KaramiA novel nanomagnetic material with a dimethylamino tag namely nano-Fe3O4@SiO2@R-NMe2 ([NFSRN]) was produced, and characterized by EDS, FT-IR, VSM, FE-SEM, XRD and TGA analyses. Then, it was applied as a highly effective and magnetically recyclable catalyst for the one-p چکیده کاملA novel nanomagnetic material with a dimethylamino tag namely nano-Fe3O4@SiO2@R-NMe2 ([NFSRN]) was produced, and characterized by EDS, FT-IR, VSM, FE-SEM, XRD and TGA analyses. Then, it was applied as a highly effective and magnetically recyclable catalyst for the one-pot multi-component reaction of malononitrile, arylaldehydes and dimedone. Interestingly, in most entries, among the possible products which can be produced from the reactants, only 2-amino-tetrahydrobenzo[b]pyrans were obtained in high yields and relatively short times, and no other product was obtained. پرونده مقاله -
دسترسی آزاد مقاله
45 - A green method for the synthesis of indeno[1,2-b]pyridines using Fe3O4@SiO2@PrSO3H as a nanomagnetic catalyst
Zohreh Kheilkordi Ghodsi Mohammadi Ziarani Alireza Badiei Hossein VojoudiThe acidic agent (SO3H) was stabilized on the silica coated Fe3O4 magnetic nanoparticles to produce Fe3O4@SiO2@Pr-SO3H, as a heterogeneous acidic catalyst, was designed, and then fully studied and characterized by FT-IR, XRD, TGA, DTA, TEM, and SEM analysis. Subsequentl چکیده کاملThe acidic agent (SO3H) was stabilized on the silica coated Fe3O4 magnetic nanoparticles to produce Fe3O4@SiO2@Pr-SO3H, as a heterogeneous acidic catalyst, was designed, and then fully studied and characterized by FT-IR, XRD, TGA, DTA, TEM, and SEM analysis. Subsequently, the catalytic activity of Fe3O4@SiO2@PrSO3H was investigated by the one-pot four- component condensation reaction between 1,3-indandione, aromatic aldehydes, acetophenone or propiophenone and ammonium acetate under the solvent-free condition at 80 ℃. The main advantages of this magnetic and heterogeneous acidic catalyst are high product yields, being environmentally benign, short reaction times, and easily separated from the reaction mixture using an external magnet. پرونده مقاله -
دسترسی آزاد مقاله
46 - Fe3O4@SiO2@IL‐PVP magnetic nanoparticles: Effective synthesis of spirooxindoles
Shahla Veysipour Masoud Nasr-Esfahani Zahra Rafiee Behrouz Eftekhari farVarious magnetite heterogeneous catalysts for the organic reaction are increasingly recognized while their stability still is a critical challenge. In this regard, SiO2, ionic liquid (IL), and polyvinyl pyrrolidone (PVP) were applied as a three-layer stabilization syste چکیده کاملVarious magnetite heterogeneous catalysts for the organic reaction are increasingly recognized while their stability still is a critical challenge. In this regard, SiO2, ionic liquid (IL), and polyvinyl pyrrolidone (PVP) were applied as a three-layer stabilization system for modifying magnetic Fe3O4 to produce Fe3O4@SiO2@IL‐PVP as a novel nanocatalyst. The Fe3O4@SiO2@IL‐PVP as stabilized heterogeneous catalysts were utilized in a robust, and environmentally friendly strategy for the preparation of the spirooxindole derivatives by the one-pot condensation of isatin, malononitrile, and 1,3-dicarbonyl in a water solvent. The proposed method revealed a high yield spirooxindole derivatives preparation (99%) at short reaction times (1.0 min), low catalyst mass (0.002 g), and satisfactory temperature (30 °C) which confirm the lack of any tedious challenge and promising applicability and reusability. This work introduces a rational core-shell nanosystem design with a facile and novel construction strategy to arrive at nonexquisite metal-based composite catalysts with superior catalytic proficiency and prominent long-term stability. پرونده مقاله -
دسترسی آزاد مقاله
47 - Synthesis and Characterization of Fe3O4@APTES@MOF-199 Magnetic Nanocatalyst and Its Application in the Synthesis of Quinoxaline Derivatives
Sami Sajjadifar Issa Amini Mina KarimianIn this research, design and synthesis of Fe3O4@APTES@MOF-199magnetic nanocatalyst nanoparticles as a novel, recyclable and heterogeneous catalyst was developed. The magnetic nanocatalyst was analyzed using various spectroscopic methods such as Fourier transform infrare چکیده کاملIn this research, design and synthesis of Fe3O4@APTES@MOF-199magnetic nanocatalyst nanoparticles as a novel, recyclable and heterogeneous catalyst was developed. The magnetic nanocatalyst was analyzed using various spectroscopic methods such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), powder X-ray diffraction (XRD), energy dispersive X‐ray (EDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM). The particle size of the nanocatalyst is about 15-96 nm. In addition, magnetic nanocatalysts have been successfully applied to the synthesis of quinoxaline derivatives with a range of derivatives. The crude compounds were isolated in84-97%yields. The recyclability of the catalyst was evaluated up to 5 times, with no loss in catalysis activity. پرونده مقاله -
دسترسی آزاد مقاله
48 - A simple synthetic technique to produce ZnO/Fe2O3/Fe3O4 nanostructures and application as a photocatalyst
Nai-Feng Hsu Kuei-Ting HsuIn this study, a simple technique was used for synthesizing one-dimensional ZnO/Fe2O3/Fe3O4 nanostructures (NSs) through heat treatment under vacuum by using a magnetic field at a temperature of 200 °C for 1 h. The photocatalytic effect of the NSs were studied by de چکیده کاملIn this study, a simple technique was used for synthesizing one-dimensional ZnO/Fe2O3/Fe3O4 nanostructures (NSs) through heat treatment under vacuum by using a magnetic field at a temperature of 200 °C for 1 h. The photocatalytic effect of the NSs were studied by decomposing methyl orange (MO) dye (5 mg/L, pH = 8.1) under ultraviolet illumination. The experimental results indicated that a 33-mg/L ZnO/Fe2O3/Fe3O4 NS-containing film on glass could reduce the MO concentration by 37% in 100 min, and the synthesized ZnO/Fe2O3/Fe3O4 NS-containing films could be reused to degrade MO solution. Moreover, 0.1 g/L of ZnO/Fe2O3/Fe3O4 NS-containing powder exhibited an excellent photocatalytic effect and reduced the MO concentration by almost 90% in 100 min. پرونده مقاله -
دسترسی آزاد مقاله
49 - Application of Fe3O4/SiO2/CeO2 nanocomposite, an efficient and magnetic catalyst, to synthesize 2,3-dihydroquinazolin-4(1H)-ones derivatives
Elham Mohamadzadeh zinat gordiA supported magnetic nanocomposite as a simple, stable, and efficient catalyst was successfully developed for condensation reaction of aldehydes, ammonium acetate, and isatoic anhydride to prepare 2,3-dihydroquinazolin-4(1H)-one derivatives as essential biologically act چکیده کاملA supported magnetic nanocomposite as a simple, stable, and efficient catalyst was successfully developed for condensation reaction of aldehydes, ammonium acetate, and isatoic anhydride to prepare 2,3-dihydroquinazolin-4(1H)-one derivatives as essential biologically active heterocyclic compounds. Ethanol as a non-toxic solvent under a reflux condition was utilized in the reactions. The Fe3O4/SiO2/CeO2 nanocomposite was prepared as a magnetic and novel catalyst. The value of components of the catalyst composite, including Fe3O4, SiO2, and CeO2, was optimized using experimental design to prepare the best catalyst composite with the highest reaction efficiency. The optimum amounts of Fe3O4, SiO2, and CeO2 in the catalyst composite were 0.37 g, 0.85 mL, and 1.28 g, respectively. The catalyst structure was characterized by FT-IR spectroscopy, vibrating sample magnetometer, Powder X-ray diffraction, and Transmission electron microscope. A sol-gel procedure was utilized to prepare the catalyst, in which chemical bonds between the catalysis components, leading to a high chemical, mechanical, and thermal stability of the catalyst. Several syntheses of 2,3-dihydroquinazolin-4(1H)-ones derivatives were performed using Fe3O4/SiO2/CeO2 (0.1 g) in EtOH (10.0 mL) under reflux for 9-19 min with yield in the range of 89-97%. The method displayed various advantages, including high yields, easy workup, low catalyst consumption, high catalyst reusability, low reaction times, and fast and straightforward catalyst separation using a magnet. پرونده مقاله -
دسترسی آزاد مقاله
50 - Catalytic activity of immobilized Ag and Pd nanoparticles on the magnetic natural zeolite using Chrysanthemum morifolium flower extract in the reduction/decolorization of dyes
Akbar Rostami-Vartooni Leila Rostami Mojtaba BagherzadehIn this study, Ag and Pd nanoparticles (NPs) were immobilized on natural zeolite and magnetized zeolite (Fe3O4/natural zeolite) by using an aqueous Chrysanthemum morifolium flower extract, as a green and low-cost method. Different techniques such as FTIR, XRD, FESEM, ED چکیده کاملIn this study, Ag and Pd nanoparticles (NPs) were immobilized on natural zeolite and magnetized zeolite (Fe3O4/natural zeolite) by using an aqueous Chrysanthemum morifolium flower extract, as a green and low-cost method. Different techniques such as FTIR, XRD, FESEM, EDS, and VSM were used for the characterization of prepared nanocomposites. The FESEM and TEM images of nanocomposites showed that the quasi-spherical Ag and Pd NPs with mostly 20–50 nm particles size have successfully formed and are well dispersed on the supports surface. The effect of various parameters such as nanocomposite type, initial dye, NaBH4 concentrations, catalyst dose, and pH were studied in the catalytic reduction/decolorization of three organic dyes. In the absence of NaBH4 or catalyst, no color changes were observed even after 90 min. The reduction rates of the selected dyes in the presence of stable catalysts were found to be in an order of Pd/Fe3O4/natural zeolite > Pd/natural zeolite > Ag/Fe3O4/natural zeolite > Ag/natural zeolite > Fe3O4/natural zeolite. پرونده مقاله -
دسترسی آزاد مقاله
51 - Preparation, Characterization and Application of a Novel Organic-Inorganic Hybrid Magnetic Nanomaterial as a Highly Efficient Catalyst for the Synthesis of Bis-Coumarins
Marziyeh Barzegar Abdolkarim Zare Aysoda Ghobadpoor Manije DianatA novel organic-inorganic hybrid magnetic nanomaterial, namely nano-[Fe3O4@SiO2@R-NMe2][FeCl4] (nano-[FSRN][FeCl4]) was prepared, and characterized by EDX, elemental mapping, FE-SEM, FT-IR, XRD, VSM, TG and DTG analyses. Then, it was applied as a highly efficient and ma چکیده کاملA novel organic-inorganic hybrid magnetic nanomaterial, namely nano-[Fe3O4@SiO2@R-NMe2][FeCl4] (nano-[FSRN][FeCl4]) was prepared, and characterized by EDX, elemental mapping, FE-SEM, FT-IR, XRD, VSM, TG and DTG analyses. Then, it was applied as a highly efficient and magnetically recyclable catalyst for the solvent-free synthesis of bis-coumarins from 4-hydroxycoumarin (2 eq.) and arylaldehydes (1 eq.). NMe2 is a basic group, and FeCl4− is a Lewis acid; thus, nano-[FSRN][FeCl4] can act as a dual-functional catalyst; based on this and the literature, a plausible mechanism was proposed for the reaction. پرونده مقاله -
دسترسی آزاد مقاله
52 - An Update on Half-decade Recent Advances in Functionalized Fe3O4 Nanoparticles as Heterogeneous Nanocatalysts for the Synthesis of Six-Membered Compounds Containing Nitrogen: A Mini-Review
Faris Mohammed Aseel M. Aljeboree Nour Abd Alrazzak Ayad F. Alkaim Yasir Karim Sarah A. Hamood Ahmed B. Mahdi Mohammed Abed Jawad Salam AhjelOver the past half-decade, the functionalized Fe3O4 nanoparticles have been applied to organic synthesis as heterogeneous nanocatalysts. Due to the magnetic properties, the functionalized Fe3O4 nanoparticles have been preferred over other catalytic systems. In addition, چکیده کاملOver the past half-decade, the functionalized Fe3O4 nanoparticles have been applied to organic synthesis as heterogeneous nanocatalysts. Due to the magnetic properties, the functionalized Fe3O4 nanoparticles have been preferred over other catalytic systems. In addition, the unique physical, chemical, and magnetic field properties of Fe3O4 nanoparticles have led to the development of them for efficient organic synthesis as heterogeneous catalytic systems. Over the past half-decade, all the researchers tried to design and develop different functionalized Fe3O4 nanoparticles to perform the organic transformation. In this mini-review, different methodologies for the synthesis of six-membered compounds (heterocyclic compounds) containing nitrogen catalyzed by functionalized Fe3O4 nanoparticles have been reviewed. This short review aims to comprehensively investigate the use of functionalized Fe3O4 nanoparticles in the synthesis of six-membered compounds (heterocyclic compounds) containing nitrogen with emphasis on their reusability of the catalysts and magnetic field of them in separation from the organic reaction medium. پرونده مقاله -
دسترسی آزاد مقاله
53 - Fe3O4@SiO2@Vitamin C@Fe2O3 Nanoparticles as a Novel Green Catalyst for One-pot Synthesis of 3-amino-1-aryl-1H-benzo[f]chromene-2-carbonitrile Derivatives
Naghmeh Darya Hassan TajikIn this research, we report a novel and green magnetic nanocatalyst; Fe3O4@SiO2@Vitamin C@Fe2O3 for clean synthesis of 3-amino-1-aryl-1H-benzo[f]chromene-2-carbonitriles with high-yield in water as solvent at room temperature. The nanocatalyst is stable under the synthe چکیده کاملIn this research, we report a novel and green magnetic nanocatalyst; Fe3O4@SiO2@Vitamin C@Fe2O3 for clean synthesis of 3-amino-1-aryl-1H-benzo[f]chromene-2-carbonitriles with high-yield in water as solvent at room temperature. The nanocatalyst is stable under the synthetic conditions and it can be reused several times without considerable reduction in its catalytic activity. The catalyst structure was characterized by using various analytical techniques; SEM, FT-IR, thermogravimetric analysis (TGA), UV-vis spectroscopy, VSM and EDS. Also, the products were separated and characterized by determining their melting points, IR spectra and compared to those of the authentic samples. Environmentally friendly, availability, high catalytic activity and ease of separation are the main reasons for using Fe3O4@SiO2@Vitamin C@Fe2O3 as a green catalyst. پرونده مقاله -
دسترسی آزاد مقاله
54 - Fe3O4 Nanoparticles from FeSiAl Alloy of Spent Printed Circuit Boards and its Application in Dye Degradation
Dinesh Patil M. Sridhara J. Manjanna Sandip SabaleFe is an important element, used in soft magnetic materials (cores) in electrical and electronic devices and its concentration in e-waste is high. Thus, this study is aimed to recover Fe from the soft magnetic FeSiAl cores of spent printed circuit boards (PCBs). Here, t چکیده کاملFe is an important element, used in soft magnetic materials (cores) in electrical and electronic devices and its concentration in e-waste is high. Thus, this study is aimed to recover Fe from the soft magnetic FeSiAl cores of spent printed circuit boards (PCBs). Here, the Fe-rich FeSiAl cores were identified, separated manually, and subjected to dissolution in citric acid (100 mM) and ascorbic acid (10 mM) mixture at 80 °C. The dissolved Fe was selectively precipitated as Fe3O4 using 20% NaOH in an N2 atmosphere at 90 °C for about 60 min. The obtained Fe3O4 shows ferromagnetic behavior with 30 emu/g saturation magnetization at 300 K. The BET surface area of Fe3O4 NPs was found to be 71.656 m2 g-1. Furthermore, the Fe3O4 NPs were utilized for methylene blue degradation with H2O2 in visible light irradiation. At optimum conditions, such as 10 ppm MB solution, 0.1 mL H2O2, and an S:L ratio of 0.05 g/L about 100% degradation was achieved in about 45 min under visible light irradiation and the correlated rate constant is 0.084 min-1. We believe that the synthesis of value-added compounds directly from the dissolution medium is an environmentally benign step toward resource recycling. پرونده مقاله -
دسترسی آزاد مقاله
55 - Magnetic Fe3O4 nanoparticles as a highly efficient catalyst for the synthesis of imidazoles under ultrasound irradiation
Javad Safari Zohre ZarnegarTo be fairly general and catalyst is easily separated by magnetic devices and can be reused without any apparent loss of activity for the reaction. Fe3O4 nanoparticles were prepared by chemical coprecipitation method and was found to be a mild and effective catalyst for چکیده کاملTo be fairly general and catalyst is easily separated by magnetic devices and can be reused without any apparent loss of activity for the reaction. Fe3O4 nanoparticles were prepared by chemical coprecipitation method and was found to be a mild and effective catalyst for the efficient, one-pot, three-component synthesis of 2,4,5-trisubstituted imidazoles at room temperature under ultrasound irradiation. The high yields of products and short reaction time were attributed to the nanosize of about 20 nm in which the catalyst could act as a nanoreactor. This methodology is found. پرونده مقاله -
دسترسی آزاد مقاله
56 - Effect of Magnetite Nanoparticles on Vegetative Growth, Physiological Parameters and Iron Uptake in Chrysanthemum (<i>Chrysanthemum morifolium</i>) ‘Salvador’
Seyed Mohammad Banijamali Mohammad Feizian Afsaneh Alinejadian Bidabadi Ebrahim MehdipourDespite the increasing rate of nanoparticles (NPS) production and their application in agriculture, few studies have focused on their effect on plant growth. So, the present research was conducted in laboratory and greenhouse conditions. First, superparamagnetic iron ox چکیده کاملDespite the increasing rate of nanoparticles (NPS) production and their application in agriculture, few studies have focused on their effect on plant growth. So, the present research was conducted in laboratory and greenhouse conditions. First, superparamagnetic iron oxide nanoparticles (SPIONS) with a humic acid coating (Fe3O4/HA) were synthesized in laboratory conditions by the chemical coprecipitation method. The effectiveness of the synthesized nanoparticles in vegetative growth and nutrients uptake of chrysanthemum cut flower (Chrysanthemum morifolium) were evaluated in greenhouse conditions with four replications in a completely randomized design. The treatments consisted of 10, 20 and 40 mg/L of pure Fe from the source of Fe3O4/HA NPS and 1.4 mg/L of pure Fe from two sources of iron chelates which contained Fe-EDTA(Fe-Ethylenediaminetetraaceticacid) and Fe-EDDHA [Fe-ethylenediaminedi(O-hydroxy phenylaceticacid)] were considered as control treatments in the open hydroponic cultivation system. The results of the laboratory experiment indicated that the synthesis of Fe3O4/HA by the chemical coprecipitation method led to the production of nanoparticles with an average diameter of 8.38 nm and superparamagnetic properties. The greenhouse experiment demonstrated that the application of Fe3O4/HA significantly increased Fe uptake, chlorophyll and vegetative growth of the plants versus the control treatments. The highest rates of Fe, N, P, K, Ca, Mg, Mn, and B uptake were observed at the NP rate of 20 mg/L. The branch number per plant, stem height, and total dry weight of the plants were significantly increased by 25, 38, and 39.5% versus the treatment of Fe-EDTA and by 50, 36, and 48% versus the treatment of Fe-EDDHA, respectively. It is concluded that magnetite NPs with a humic acid coating resolved Fe deficiency and increased chrysanthemum growth. پرونده مقاله -
دسترسی آزاد مقاله
57 - آماده سازی و بررسی خصوصیات نانوذرات مگنتیک-زیست تخریب‌پذیر مبتنی بر پلی اورتان جهت انتقال ژن به سلول‌های MCF-7
ژاله علی رضازاد هاشم یعقوبی سمیه جاوید زهرا عجمباتوجه به اینکه در بسیاری از سلول‌های سرطانی گیرنده‌های فولیک اسید به مقدار زیادی بیان می‌گردد، بنابراین این ملکول کاندیدای مناسبی جهت هدفمندسازی نانوذرات به منظور انتقال هدفمند ژن به سلول‌ها سرطانی است. در این مطالعه نانوذرات دوگانه دوست Fe3O4-PEI-PU-PEG-FA طراحی شدند. چکیده کاملباتوجه به اینکه در بسیاری از سلول‌های سرطانی گیرنده‌های فولیک اسید به مقدار زیادی بیان می‌گردد، بنابراین این ملکول کاندیدای مناسبی جهت هدفمندسازی نانوذرات به منظور انتقال هدفمند ژن به سلول‌ها سرطانی است. در این مطالعه نانوذرات دوگانه دوست Fe3O4-PEI-PU-PEG-FA طراحی شدند. سپس خصوصیات نانوذرات حاصل با استفاده از طیف سنج مادون قرمز (FTIR)، دستگاه اندازه‌گیری خواص مغناطیسی (VSM) مورد بررسی قرار گرفتند. نتایج FTIR و VSM به ترتیب نشان دادند که سنتز نانوذرات Fe3O4-PEI-PU-PEG-FA با موفقیت انجام شده و نانوذرات حاصل از خاصیت مغناطیسی مناسبی برخوردارند. از میکروسکوپ الکترونی عبوری (TEM) به مظور بررسی مورفولوژی نانوذرات حاصل استفاده گردید که تصاویر حاصل، نشان داد نانوذرات Fe3O4-PEI-PU-PEG-FA دارای ساختار کروی می‌باشند. بررسی زیست سازگاری و همچنین بررسی توانایی نانوذرات Fe3O4-PEI-PU-PEG-FA در انتقال DNA به سلول‌های MCF-7 از دیگر فاکتورهای مورد بررسی در این تحقیق بود که به ترتیب توسط تست MTT و دستگاه فلوسایتومتری مورد بررسی قرار گرفتند. نتایج حاصل نشان داد نانوذرات Fe3O4-PEI-PU-PEG-FA از سمیت پایین و بازده انتقال ژن بالاتری در مقایسه با پلیمر PEI برخوردار بودند. پرونده مقاله -
دسترسی آزاد مقاله
58 - تهیه نانوچندسازه کیتوسان- فولیک اسید/ Fe3O4 از پوسته میگو و بررسی اثر پادباکتریایی آن بر اشرشیاکلی و استافیلوکوکوس اورئوس
ژولیت اردوخانیان شهلا مظفری نرگس عجمی شیما نهالد در این پژوهش با تهیه کیتوسان از پوسته میگو که کم هزینه و در دسترس است، نانوچندسازه تخریب پذیر و زیست سازگار از کیتوسان عامل دارشده با فولیک اسید با افزودن نانوذره های Fe3O4 به دست آمد. ابتدا با افزودن فولیک اسید در محیط اسیدی به کیتوسان تهیه شده، به کمک دستگاه همز چکیده کاملد در این پژوهش با تهیه کیتوسان از پوسته میگو که کم هزینه و در دسترس است، نانوچندسازه تخریب پذیر و زیست سازگار از کیتوسان عامل دارشده با فولیک اسید با افزودن نانوذره های Fe3O4 به دست آمد. ابتدا با افزودن فولیک اسید در محیط اسیدی به کیتوسان تهیه شده، به کمک دستگاه همزن فراصوت، مشتق کیتوسان- فولیک اسید به دست آمد. سپس، با افزودن آن به محلول نانوذره های Fe3O4 تهیه شده از محلول نمک های آهن (II) و آهن (III) به روش هم رسوبی، نانوچندسازه کیتوسان- فولیک اسید/ Fe3O4 تهیه شد که خواص ویژه پادباکتریایی بر برخی ریزاندامگان های بیماری زا دارد. ویژگی های نانوچندسازه تهیه شده با روش های طیف سنجی تبدیل فوریه فروسرخ(FTIR)، میکروسکوپی الکترونی پویشی (SEM) و پراش پرتو ایکس (XRD) بررسی شد. نتیجه های آزمایش های پاد باکتریایی نشان دادند هر دو مشتق تهیه شده از کیتوسان در غلظت μg/ml 200 می توانند از رشد باکتری گرم منفی اشرشیاکلی و گرم مثبت استافیلوکوکوس اورئوس جلوگیری کنند. پرونده مقاله -
دسترسی آزاد مقاله
59 - بررسی تاثیر پیش ماده های مس سولفید و تاثیر نسبت مس سولفید به آهن اکسید در فعالیت فوتوکاتالیستی چندسازه های مغناطیسی CuS/Fe3O4 برای حذف آنیلین زیر تابش نور مرئی
پروانه نخستین پناهی فائزه پیروی محمد حسین رسولی فردآنیلین یکی از ساده ترین ترکیب های آروماتیکی آمینی است که به شدت سمی و استنشاق این ماده موجب التهاب ریه ها می شود و در غلظت های بالا خوردن یا استنشاق بخار آن کشنده است. هدف از پژوهش حاضر، حذف آنیلین با فرایند فوتوکاتالیستی با مس سولفید زیر تابش نور مرئی است. در ابتد چکیده کاملآنیلین یکی از ساده ترین ترکیب های آروماتیکی آمینی است که به شدت سمی و استنشاق این ماده موجب التهاب ریه ها می شود و در غلظت های بالا خوردن یا استنشاق بخار آن کشنده است. هدف از پژوهش حاضر، حذف آنیلین با فرایند فوتوکاتالیستی با مس سولفید زیر تابش نور مرئی است. در ابتدا تاثیر نوع پیش ماده های مس و گوگرد در تهیه مس سولفید بررسی شد، سپس، برای ایجاد ویژگی مغناطیسی در فوتوکاتالیست و جداسازی آسان آن از تعلیقه با آهنربا، چندسازه هایی با نسبت های متفاوت از مس سولفید و Fe3O4 مغناطیسی تهیه شد. برای بررسی ویژگی های فیزیکی و شیمیایی نمونه های تهیه شده از پراش پرتو ایکس، میکروسکوب الکترونی روبشی و طیف سنجی بازتابشی انتشاری فرابنفش-مرئی استفاده شد. بررسی فعالیت فوتوکاتالیستی نشان داد که مس سولفید تهیه شده با مس استات و تیواستامید، بیشترین فعالیت فوتوکاتالیستی را نسبت به مس سولفیدهای تهیه شده با پیش ماده های دیگر از خود نشان می دهد. همچنین، با افزودن Fe3O4 به مس سولفید افزون بر ایجاد ویژگی مغناطیسی، عملکرد فوتوکاتالیستی و در نتیجه درصد حذف آنیلین نیز افزایش می یابد. پرونده مقاله -
دسترسی آزاد مقاله
60 - سنتز، شناسایی، و ارزیابی فعالیت های پادباکتری فیلم های نانوچندسازه جدید کیتوسان/فسفر تری آمید/Fe3O4
صمد یاراحمدی نیلوفر درستی مریم پاس عبدالناصر محمدیدر این پژوهش فیلم های نانوچندسازه جدیدی بر پایه کیتوسان-فسفر تری آمید با مقادیر متفاوتی از 1 تا 5 درصد Fe3O4 تهیه شد. نانو ذره های کروی Fe3O4 با اندازه حدود 18 تا 24 نانومتر به روش هم رسوبی از نمک هایFeCl3.9H2O و FeCl2.4H2O به دست آمدند. مشتق فسفر تری آمید از واکنش ترشی چکیده کاملدر این پژوهش فیلم های نانوچندسازه جدیدی بر پایه کیتوسان-فسفر تری آمید با مقادیر متفاوتی از 1 تا 5 درصد Fe3O4 تهیه شد. نانو ذره های کروی Fe3O4 با اندازه حدود 18 تا 24 نانومتر به روش هم رسوبی از نمک هایFeCl3.9H2O و FeCl2.4H2O به دست آمدند. مشتق فسفر تری آمید از واکنش ترشیوبوتیل آمین با فسفریل کلرید تهیه شد. الگوی پراش پرتو ایکس XRD، و تصویر برداری SEM از Fe3O4، کیتوسان، کیتوسان-فسفر تری آمید، و فیلم های نانوچندسازه کیتوسان-فسفر تری آمید/(1 تا 5 درصد) Fe3O4 بررسی شد. نتیجه ها تشکیل فیلم های موردنظر را تایید کرد. افزون براین، اندازه و ساختار نانوچندسازه با تغییر بسامد (37 هرتز و 80 هرتز) و قدرت دستگاه فراصوت (30، 60، و 100 وات) بررسی شد. اثر پادباکتری نانوچندسازه و موادسازنده آن بر دو باکتری گرم مثبت (استافیلوکوکوس اورئوس و باسیلوس سروئوس) و یک رده باکتری گرم منفی (سودوموناس ائروژینوزا) ارزیابی شد. نانوچندسازه با درصد بیشتر Fe3O4، بیشترین تاثیر را نشان داد و این اثر بر باکتری گرم مثبت باسیلوس سروئوس بیشتر مشاهده شد. پرونده مقاله -
دسترسی آزاد مقاله
61 - بازیافت ترفتالیک اسید از ضایعات پلی اتیلن ترفتالات در حضور نانو ذرات آهن اکسید اصلاح شده با نانو سیلیکا تحت تابش امواج ریزموج
میرمحمد علوی نیکجه المیرا قمریبازیابی ترفتالیک اسید (TPA) از ضایعات پلی اتیلن ترفتالات (PET) تحت تابش ریزموج در حضور دی اتیلن گلیکول (DEG) به عنوان حلال، سدیم هیدروکسید (NaOH) به عنوان کاتالیست و نانو ذرات آهن اکسید اصلاح شده با نانو سیلیکا (nano-Fe3O4@SiO2) به عنوان بستر جامد انجام شد. واکنش در یک چکیده کاملبازیابی ترفتالیک اسید (TPA) از ضایعات پلی اتیلن ترفتالات (PET) تحت تابش ریزموج در حضور دی اتیلن گلیکول (DEG) به عنوان حلال، سدیم هیدروکسید (NaOH) به عنوان کاتالیست و نانو ذرات آهن اکسید اصلاح شده با نانو سیلیکا (nano-Fe3O4@SiO2) به عنوان بستر جامد انجام شد. واکنش در یک راکتور قابل کنترل ریزموج انجام شد و نسبت وزنی PET:DEG، PET:NaOH و nano-Fe3O4@SiO2:NaOH با جزئیات مورد بررسی قرار گرفت. نتیجه‌های به‌دست آمده نشان داد در حضور 0/4 گرم از NaOH، 1/0 گرم از nano-Fe3O4@SiO2 و نسبت مولی 1:6 از96PET:DEG % از TPA بازیافت شد. در پایان واکنش، nano-Fe3O4@SiO2 با یک آهن‌ربای مغناطیسی از محیط واکنش خارج شد و بدون اینکه کارایی آن کم شود و کاهش قابل ملاحظه‌ای در مقدار ترفتالیک اسید به‌دست آمده مشاهده شود، چندین بار مورد استفاده قرار گرفت. پرونده مقاله -
دسترسی آزاد مقاله
62 - کاربرد نانو ذرات مغناطیسی آهن اکسید عامل‌دار شده با 8- هیدروکسی کینولین برای پیش‌تغلیظ یون‌های +Zn2 پیش از اندازه‌گیری اسپکتروفتومتری
سید عبدالرسول هاشمی ابوذر طاهری کاظم منصوریدر این پژوهش یک روش جدید برای استخراج فاز جامد و پیش‌تغلیظ مقادیر ناچیز یون‌های Zn2+ از محلول آبی با استفاده از نانوذرات مغناطیسی Fe3O4 پوشش داده شده با سیلیکا و اصلاح شده با 8- هیدروکسی کینولین (Fe3O4@SiO2-8-HQ) به‌عنوان جاذب پیش از اندازه‌گیری طیف‌سنجی با واکنشگر دیتی چکیده کاملدر این پژوهش یک روش جدید برای استخراج فاز جامد و پیش‌تغلیظ مقادیر ناچیز یون‌های Zn2+ از محلول آبی با استفاده از نانوذرات مغناطیسی Fe3O4 پوشش داده شده با سیلیکا و اصلاح شده با 8- هیدروکسی کینولین (Fe3O4@SiO2-8-HQ) به‌عنوان جاذب پیش از اندازه‌گیری طیف‌سنجی با واکنشگر دیتیزون تشریح شده است. جاذب مغناطیسی به‌وسیله روش‌های SEM و FT-IR مشخصهیابی شد. همه آزمایش‌های جذب درون یک سامانه ناپیوسته انجام شدند. جاذب مغناطیسی حامل Zn2+ به‌آسانی با استفاده از یک میدان مغناطیسی خارجی از محلول‌های آبی جدا شد و یون‌های روی جذب شده با استفاده از یک محلول اسیدی واجذب شد. عوامل گوناگون مؤثر بر بازیابی آنالیت همانند pH محلول، زمان تماس، مقدار جاذب، حجم نمونه، غلظت و حجم محلول واجذب کننده، و یون‌های خارجی موردبررسی قرار گرفت. داده‌های جذبی تجربی به‌خوبی با مدل هم‌دمای لانگمویر مطابقت داشتند. مطالعات سینتیکی نشان دادند که جذب سطحی از مدل شبه مرتبه دوم پیروی می‌کند. تحت شرایط بهینه، عامل غنی‌سازی، حد تشخیص و انحراف استاندارد نسبی برای اندازه‌گیری μg l–1 ) Zn2+ 50/0) به‌ترتیب برابر 84، μg l–1 2/7 و 2/93% به دست آمد. روش پیشنهادی با موفقیت برای اندازه‌گیری Zn2+ در نمونه‌های حقیقی آب و پساب به کار گرفته شد. پرونده مقاله -
دسترسی آزاد مقاله
63 - Fast Removal of Citalopram Drug from Waste Water Using Magnetic Nanoparticles Modified with Sodium Dodecyl Sulfate Followed by UV-Spectrometry
M. Khoeini Sharifabadi M. Saber Tehrani A. Mehdinia P. Abroomand Azar S. Waqif HusainA simple and sensitive, solid-phase extraction method for the removal of Citalopram drug from waste water has been developed by using magnetic nanoparticles modified with surfactant sodium dodecyl sulfate. These magnetic nanoparticles have shown great adsorptive tendenc چکیده کاملA simple and sensitive, solid-phase extraction method for the removal of Citalopram drug from waste water has been developed by using magnetic nanoparticles modified with surfactant sodium dodecyl sulfate. These magnetic nanoparticles have shown great adsorptive tendency towards Citalopram drug. The effect of different parameters influencing the extraction efficiency of this drug were investigated and optimized including the pH, amount of the surfactant, contact time and temperature. The extracts were analyzed by ultraviolet spectrophotometry at 239nm. Under these conditions, the related standard deviation (RSD %) of the method at two concentrations (5 and 50µg.mL-1) was in the range of (3.14–3.75) % (n = 8). The calibration curve was linear in the range of 2-100 µg.mL-1 of Citalopram drug with a correlation coefficient of >0.99. پرونده مقاله -
دسترسی آزاد مقاله
64 - Preparation of Modified Magnetic Nanocomposites Dithiooxamide/Fe3O4 for Preconcentration and Determination of Trace Amounts of Cobalt Ions in Food and Natural Water Samples
Ali Mirabi Nafiseh AliakbariThe first study on the high efficiency of nanometer-sized magnetic nanoparticles (Fe3O4) coated with sodium dodecyl sulfate (SDS) and dithiooxamide as a new sorbent solid phase extraction has been reported. Modified magnetic nanicomposites was used to preconcentrate and چکیده کاملThe first study on the high efficiency of nanometer-sized magnetic nanoparticles (Fe3O4) coated with sodium dodecyl sulfate (SDS) and dithiooxamide as a new sorbent solid phase extraction has been reported. Modified magnetic nanicomposites was used to preconcentrate and separate Co (II) ions in food and environmental water samples. Magnetic nanoparticles were prepared by chemical precipitation of Fe (II) and Fe (III) salts from aqueous solution by ammonia solution. These magnetic nanoparticles and nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermo gravimetric analysis (TGA) and elemental analysis CHNS. A micro sample introduction system was employed for the nebulization micro-volume of diluted solution into flame atomic absorption spectrometry (FAAS). The extraction conditions were optimized by selecting the appropriate extraction parameters including the amount of nanosorbent, pH value, volume of dithiooxamide and condition of eluting solution. The detection limit of this method for Co (II) ions was 1.21 ng ml-1 and the R.S.D. was 0.9% (n=6). The advantages of this new method include rapidity, easy preparation of nanosorbents and a high preconcentration factor. The proposed method has been applied to the determination of Co (II) ions at trace levels in real samples such as, kiwi, orange, cucumber, apple, green pepper, honey, potato, tap water, river water and sea water with satisfactory results. پرونده مقاله -
دسترسی آزاد مقاله
65 - Ultrasound- and Magnetic Assisted Dispersive-Micro-Solid-Phase Extraction followed by Atomic Absorption Spectrometry based on Carbon Quantum Dots Functionalized with Magnetite/Zeolitic Imidazolate Framework 71/Polypyrrole for Determination and Trace Monitoring of Pb (II) in Water and Food Samples
Elnaz Nakhostin Mortazavi Mohsen Zeeb Seyed Saied HomamiIn this search, an ultrasound-and magnetic-assisted dispersive micro-solid-phase extraction (US-M-A-DMSPE) was developed for selective separation of Pb ion by an innovative nanocomposite based on carbon quantum dots functionalized with magnetite/zeolitic imidazolate fra چکیده کاملIn this search, an ultrasound-and magnetic-assisted dispersive micro-solid-phase extraction (US-M-A-DMSPE) was developed for selective separation of Pb ion by an innovative nanocomposite based on carbon quantum dots functionalized with magnetite/zeolitic imidazolate framework 71/polypyrrole. To fabricate the novel nanocomposite, first, the magnetized carbon quantum dot was functionalized by imidazolate zeolite-71, and then pyrrole was utilized as an oxidant agent in the chemical polymerization on the surface of magnetic carbon quantum dot functionalized with zeolitic imidazolate framework 71. Lead was analyzed by flam atomic absorption spectrometry (FAAS). The structure of nanosorbent was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy-dispersive X-ray analyzer (EDX), vibrating sample magnetometry (VSM) and Fourier transform-infrared (FT-IR). To maximum recoveries of Pb (II), the optimum experimental conditions and analytical parameters such as amount of sorbent, pH of samples, ultrasonic time, chelating agent concentration, ionic strength, volume of desorbing solvent and reusability were estimated. Under the optimal conditions, the preconcentration factor was achieved 60. The limits of detection and quantification were found to be 0.15 ng mL−1 and 0.5 ng mL−1, respectively. The relative standard deviations (RSD%) of the developed US-M-A-DMSPE process is below was 2.9 %. The present process was successfully applied to the determination of Pb2+ ion at trace levels in water and food samples by ultrasound-and magnetic-assisted dispersive micro-solid-phase extraction tandem flame atomic adsorption spectroscopy (US-M-A-DMSPE-FAAS) and its validation was investigated by recovery experiments and analyzing certified reference material. پرونده مقاله
سکوی نشر دانش
سند یا سکوی نشر دانش ،سامانه ای جهت مدیریت حوزه علمی و پژوهشی نشریات دانشگاه آزاد می باشد
پیوندهای سایت
مراکز مرتبط
پشتیبانی
صفحات رسمی
حقوق این وب‌سایت متعلق به سامانه مدیریت نشریات دانشگاه آزاد اسلامی است.
حق نشر © 1403-1400