مهندسی شیمی ایران

مهندسی شیمی ایران

بهبود عملکرد فتوکاتالیستی نانوکامپوزیت TiO2/g-C3N4 در تخریب رودامین ب تحت تابش نور مرئی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناسی ارشد مهندسی شیمی، دانشگاه علم و صنعت ایران
2 استادیار مهندسی محیط زیست، پژوهشگاه نیرو
3 استادیار مهندسی شیمی، دانشگاه علم و صنعت ایران
چکیده
در تحقیق حاضر، بهمنظور بهبود سرعت بازترکیب الکترون- حفره در g-C3N4، از سنتز کامپوزیت TiO2/g-C3N4 استفاده شدهاست. این کامپوزیت برای نخستینبار با اوره، تتراکلرید تیتانیوم و محلول آمونیاک، سنتز و خواص ساختاری آن با آنالیزهای XRD، BET، FESEM، EDS، DRS و PL بررسی و تشکیل موفقیتآمیز کامپوزیت نشان دادهشد. آنالیز DRS و PL به‌ترتیب شکاف نواری کاهشیافتۀ (eV 95/2) بهدلیل حضور g-C3N4 در ساختار کامپوزیت و عملکرد بهتر کامپوزیت را نسبتبه g-C3N4 در جداسازی الکترون- حفره اثبات کرد. نتایج آزمون فتوکاتالیستی نیز نشان از برتری کامپوزیت نسبتبه g-C3N4 در تجزیۀ رودامین ب دارد و درمدت 20 دقیقه، 6/96% رودامین ب را حذف می­کند. اثر حضور H2O2، نقش مثبت اکسیژن و منفی نیتروژن بر حذف رودامین ب به‌وسیلۀ کامپوزیت TiO2/g-C3N4 بررسی شد. ضمن اینکه درحضور H2O2 بیشاز 70 درصد رنگ به‌وسیلۀ کامپوزیت در تاریکی حذف شد. مقایسۀ عملکرد کامپوزیت سنتزشده در این کار با سایر کامپوزیت­های مشابه نشاندهندۀ کارایی قابل قبول آن در تجزیۀ رودامین ب تحت تابش نور مرئی است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Improvement of Photocatalytic Activity of TiO2/g-C3N4 Nanocomposite for RhB Degradation Under Visible Light

نویسندگان English

E. Tiznobeik 1
S. Alijani 2
A. Bazyari 3
1 M. Sc. Student of Chemical Engineering, Iran University of Science and Technology
2 Assistant Professor of Environment Engineering, Niroo Research Institute
3 Assistant Professor of Chemical Engineering, Iran University of Science and Technology
چکیده English

In this research, in order to improve the electron-hole recombination rate in g-C3N4, the synthesis of TiO2/g-C3N4 composite was used. This composite was synthesized for the first time by urea, titanium tetrachloride and ammonia solution and its structural properties were analyzed by XRD, BET, FESEM, EDS, DRS and PL analysis and the successful creation of the composite was shown. DRS and PL analysis respectively reduced band gap (2.95 eV) proved the reason for the presence of g-C3N4 in the composite structure and the better performance of the composite than g-C3N4 in electron-hole separation. The results of the photocatalytic test also show the superiority of the composite over g-C3N4 in the decomposition of Rhodamine B, and it removes 96.6% of rhodamine b within 20 minutes. The effect of the presence of H2O2, the positive and negative role of nitrogen on the removal of Rhodamine B by TiO2/g-C3N4 composite was investigated. Moreover, in the presence of H2O2, more than 70% of the color was removed by the composite in the dark. Comparing the performance of the composite synthesized in this work with other similar composites shows its acceptable performance in the analysis of rhodamine under visible light irradiation.

کلیدواژه‌ها English

TiO2/g-C3N4 Composite
Rhodamine B
Visible Light
Precursors
Recombination of Hole-Electron
Operational Parameters
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