مهندسی شیمی ایران

مهندسی شیمی ایران

سنتز نانوکامپوزیتهای SnO2/Co3O4 دوپشدهبا آهن برای تخریب فوتوکاتالیستی مبتنیبر نور مرئی رنگ پایۀ آبی 41

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد مهندسی مواد و متالورژی، دانشگاه کاشان
2 دانشیار مهندسی مواد و متالورژی، دانشگاه کاشان
چکیده
هدفاز این تحقیق، بررسی فعالیت فوتوکاتالیستی نانوکامپوزیتهای SnO2/Co3O4 دوپشدهبا آهن برای تخریب فوتوکاتالیستی رنگ پایۀ آبی 41 (BB41) زیر تابش نور مرئی است. باتوجهبه اثرات مخرب آلایندههای حاوی رنگهای صنعتی بر سلامتی انسانها و محیط زیست، حذف این رنگها از پسابها بسیار مهم است. بدینمنظور، ردیفهای منظمی از نانولولۀ دیاکسید قلع (SnO2) و نانوذرات Co3O4 دوپشدهبا مقادیر مختلف آهن (0، 5، 10 و 15 درصد اتمی) بهترتیب بااستفادهاز فرایندهای رسوبنشانی فاز مایع (LPD) و سل- ژل سنتزشد. نانوذرات Co3O4 دوپشدهبا آهن، برای تشکیل نانوکامپوزیتهای ناهمگون برروی سطح نانولولههای SnO2 قرارگرفت. نمونههای حاصل بااستفادهاز آنالیزهای پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی گسیلمیدان (FESEM)، طیفسنجی پراکندگی انرژی پرتو ایکس (EDS)، طیف‌سنجی فروسرخ تبدیل فوریه (FTIR)، طیفسنجی فرابنفش- مرئی بازتاب نفوذی (UV-Vis DRS) و نشر فوتولومینسانس (PL) مشخصهیابیشد. نتایج نشانداد که نانوکامپوزیت SnO2/Co3O4 با 10 درصد اتمی دوپنت آهن بالاترین راندمان فوتوکاتالیستی را با ثابت سرعت واکنش 0/065 بر دقیقه نشانداد که بهترتیب حدود 8 و 5/9 برابر بیشتر از نمونههای SnO2 و Co3O4 خالص است. این عملکرد ارتقایافته، حاصل بهبود انتقال بار، جابه‌جایی قرمز در جذب نور و جدایش مؤثر الکترون- حفرۀ حاصلاز اثر دوپ یونهای آهن درشبکۀ نانوذرات Co3O4 و جفتشدن آن با نانولولههای SnO2 است.
کلیدواژه‌ها

عنوان مقاله English

Synthesis of SnO2/Fe-Doped Co3O4 Nanocomposites for Visible-Light-Driven Photocatalytic Degradation of Basic Blue 41 (BB41) Dye

نویسندگان English

F. Haghparast 1
A. Sadeghzadeh-Attar 2
1 M.Sc. Student in Metallurgy and Materials Engineering, University of Kashan
2 Associate Professor of Metallurgy and Materials Engineering, University of Kashan
چکیده English

This paper is aimed at investigating the photocatalytic activity of SnO2/Fe-doped Co3O4 nanocomposites for the photocatalytic degradation of basic blue 41 (BB41) dye under visible light irradiation. Considering the harmful effects of pollutants containing industrial dyes on human health and the environment, removing these dyes is of great importance. For this purpose, highly ordered tin dioxide (SnO2) nanotube arrays and cobalt oxide (Co3O4) nanoparticles doped with different amounts of iron (0, 5, 10 and 15 at.% Fe) were synthesized via the liquid phase deposition (LPD) and sol-gel processes, respectively. Fe-doped Co3O4 nanoparticles were anchored on the surface of SnO2 nanotubes to form heterojunction nanocomposites. The resulting samples were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), UV-vis diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence emission (PL) were characterized.
The results showed that the SnO2/10 at.% Fe-doped Co3O4 nanocomposite exhibited the highest photocatalytic efficiency with
a reaction rate constant of 0.065 min-1, which is about 8 and 5.9 times higher than pristine SnO2 nanotubes and Co3O4 nanoparticles, respectively. This enhanced performance can be attributed to the improved charge transfer, red-shift in light absorption and effective electron-hole separation resulting from the doping effects of Fe ions in the Co3O4 lattice and its coupling with SnO2 nanotubes.
 
 

کلیدواژه‌ها English

SnO2/Co3O4 Nanocomposite
Fe Dopant Photocatalytic Activity
Basic Blue 41 (BB41)
Visible Light
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