شیمى کاربردى روز

شیمى کاربردى روز

سنتز نانوکامپوزیت مبتنی بر اکسید روی برای حذف فتوکاتالیستی آلاینده های رنگی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 دانشکده شیمی، گروه شیمی معدنی، دانشگاه گیلان، رشت، ایران
2 گروه علوم مهندسی، دانشکده فنی و مهندسی شرق گیلان، دانشگاه گیلان
چکیده
در این تحقیق نانوذرات اکسید روی به روش رسوب شیمیایی و نیترید کربن گرافیت به روش تجزیه حرارتی سنتز شدند. نانوکامپوزیت‌های اکسید روی دوپ‌شده با g-C3N4 با استفاده از روش اولتراسونیک تهیه شد. نمونه‌ها با پراش اشعه ایکس (XRD)، میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM)، طیف‌سنجی مادون‌قرمز تبدیل فوریه (FT-IR) و طیف‌سنجی بازتابی منتشر (DRS) شناسایی شدند. نتایج XRD نشان داد که اکسید روی و نیترید کربن گرافیت به ترتیب دارای ساختار ورتزیت شش‌ضلعی و ساختار شش‌ضلعی هستند. مشخص شد که اندازه ذرات نانوکامپوزیت ZnO/g-C3N4 کمتر از 100 نانومتر است. اثر پارامترهای عملیاتی مانند غلظت عناصر آلاینده، مقدار فوتوکاتالیست، pH، غلظت اولیه متیلن بلو، اثر عوامل اکسنده و زمان تابش بر میزان تخریب بررسی شد. فعالیت فوتوکاتالیستی نانوکامپوزیت‌های ZnO، g-C3N4 و ZnO/g-C3N4 با تجزیه فوتوکاتالیستی متیلن بلو در محلول آبی ارزیابی شد. نتایج نشان می‌دهد که فعالیت فوتوکاتالیستی فتوکاتالیست ZnO/g-C3N4 بسیار بالاتر از ZnO غیر آلاییده است. هم‌افزایی g-C3N4 منجر به باریک شدن شکاف باند می‌شود و فعالیت فوتوکاتالیستی را تا حد زیادی بهبود می‌بخشد. فوتوکاتالیست ZnO/g-C3N4 با نسبت 15% مولی بهترین فعالیت نوری را نشان می‌دهد و بازده تجزیه تحت تابش نور مرئی در مقایسه با نمونه خالص ZnO تقریباً تا 95 درصد بهبودیافته است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Synthesis of Zinc Oxide-based nanocomposites for photocatalytic removal of contaminant

نویسندگان English

Maryam Tondkar Mobaraki 1
Hassan Zavvar Mousavi 1
Hadi Fallah Moafi 1
Mohammad Mohammad Pour Moghadam 2
1 Department of Inorganic Chemistry, Faculty of Chemistry, University of Guilan, Rasht, Iran
2 Department of Engineering Science, Faculty of Technology and Engineering East of Guilan, University of Guilan, Rudsar, Iran
چکیده English

In this research, zinc oxide nanoparticles were synthesized by the chemical precipitation method, and graphite carbon nitride was synthesized by the thermal decomposition method. Nanocomposites of zinc oxide co-doped with g-C3N4 were prepared using the Ultrasonic method. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FT-IR), and diffuse reflectance spectroscopy (DRS). The XRD results revealed that zinc oxide and graphite carbon nitride have a hexagonal wurtzite structure and a hexagonal structure, respectively. It was found that the particle size of the
ZnO/g-C3N4 nanocomposite was less than 100 nm. The effect of operational parameters such as concentration of doping elements, photocatalyst dosage, pH, initial concentration of Methylene Blue, effect of oxidants, and irradiation time on the extent of degradation was investigated. The photocatalytic activity of the undoped ZnO, g-C3N4, and
ZnO/g-C3N4 nanocomposite photocatalysts were evaluated by the photocatalytic degradation of methylene blue in an aqueous solution. The results show that the photocatalytic activity of the ZnO/g-C3N4 photocatalyst is much higher than that of undoped ZnO. The cooperation of the g-C3N4 leads to the narrowing of the band gap and greatly improves the photocatalytic activity. The ZnO/g-C3N4 photocatalyst 15 mol% shows the best photoactivity and photodecomposition efficiencies were improved by 95% under Visible irradiation approximately compared with the pure ZnO sample.

کلیدواژه‌ها English

ZnO-gC3N4 nanocomposite
Photocatalyst
Methylene blue
Photocatalytic degradation
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