نانوچندسازه منیزیم فریت/گرافن اکسید کاهیده و کاربرد فتوکاتالیستی آن در تخریب آلاینده و تولید سوخت

محورهای موضوعی : شیمی کاربردی

مجید غنیمتی ¹ , محسن لشگری ² , واسیلیوس بیناس ³

1 - پژوهشگر پسادکتری دانشکده شیمی، دانشگاه تحصیلات تکمیلی علوم پایه زنجان، ایران
2 - دانشیار گروه شیمی فیزیک، دانشکده شیمی، دانشگاه تحصیلات تکمیلی علوم پایه زنجان، ایران
3 - پژوهشگرموسسه ساختار الکترونیکی و لیزر هراکلیون، بنیاد تحقیقات و فناوری–هلاس، یونان

تاریخ دریافت : 1402/02/20 تاریخ پذیرش : 1402/04/29 تاریخ انتشار : 1402/06/01

کلید واژه: تولید هیدروژن, هیدروژن سولفید, تخریب فتوکاتالیستی آلاینده‌ها, نانوچندسازه نیم‌‌رسانا, منیزیم فریت, گرافن اکسید کاهیده, حذف رنگ متیل اورانژ,

چکیده مقاله :

تهیه مواد نانوچندسازه کارآمد با استفاده از عناصر فراوان زمین و ترکیب های دوستدار محیط زیست و کاربرد آن ها با هدف تخریب نور کاتالیستی مواد خطرناک و تولید سوخت، یک راهبرد پایدار برای حذف آلاینده و تامین هیدروژن به عنوان سوخت سبز (فاقد کربن) در دنیای مدرن است. در این پژوهش، نیم رسانای نانوساختار منیزیم فریت (MgFe2O4) سنتز و برای تولید گاز هیدروژن از راه شکافت نوری محلول قلیایی سیر شده از H2S و تخریب فتوکاتالیستی آلاینده مقاوم رنگ آزو (متیل اورانژ) استفاده شد. بررسی ها مشخص کرد فتوکاتالیست سنتزی، از توانایی لازم برای تخریب آلاینده و تولید هیدروژن برخوردار است. برای بهبود فعالیت فتوکاتالیست، پیش ساز گرافن اکسید به روش هامرز اصلاح شده تهیه و از آن به شکل مستقیم در سنتز آب گرمایی نانوچندسازه منیزیم فریت/گرافن اکسید کاهیده استفاده شد. شواهد نشان داد وجود گرافن اکسید کاهیده و تشکیل نانوچندسازه قادر است توانایی رنگ زدایی و تولید هیدروژن را از راه افزایش مساحت سطح فتوکاتالیست، کاهش بازترکیب الکترون-حفره و تقویت جذب فوتون، به مقدار قابل توجهی افزایش دهد. بازده تخریب پس از یک ساعت کار فتوواکنشگاه برابر با 84 درصد و سرعت آزادسازی هیدروژن برابر با 5567 میکرومول بر ساعت بر گرم فتوکاتالیست به دست آمد که بیانگر عملکرد خوب فتوکاتالیست نانوچندسازه برای حذف آلاینده و تولید سوخت است.

چکیده انگلیسی:

Preparation of effective nanocomposite energy materials using Earth-abundant elements and eco-friendly chemicals for application in photocatalytic degradation of hazardous materials and production of fuel is a sustainable strategy for pollutant removal and supplying hydrogen, the green/carbon-free fuel in modern world. In this article, the nanostructured magnesium ferrite (MgFe2O4) semiconductor was synthesized and employed for the production of hydrogen gas through the light-induced splitting of alkaline H2S solution and photocatalytic degradation of methyl orange–a refractory azo dye. Investigations revealed that the synthesized photocatalyst has the ability to destroy pollutant and produce hydrogen. To improve the photocatalyst activity, graphene oxide (GO) precursor was prepared through the modified Hummers method and utilized directly in the hydrothermal synthesis of MgFe2O4/rGO nanocomposite. The evidence showed that the presence of rGO (reduced graphene oxide) and the formation of nanocomposite can significantly increase the decolorization ability and hydrogen release in terms of enlarging the photocatalyst surface area, slowing down the electron-hole recombination, and enhancing photon absorption. The degradation efficiency was 84% [measured after one hour operation of the photoreactor] and the rate of hydrogen release was 5567 µmol/h [per gram of photocatalyst], indicated the good performance of the nanocomposite photocatalyst in pollutant removal and fuel production

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