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Environmental Engineering Research 2025;30(1): 240121 DOI: https://doi.org/10.4491/eer.2024.121
Activated carbon/g-C3N4 /H2O2 system with enhanced photocatalytic activity for Rhodamine-B degradation under the visible light
Lan Nguyen Thi1, Thi Thuy Trang Phan1, Lam Nguyen Tan1, Thanh Lieu Thi Le1, Le Tuan Nguyen1, Nguyen Tien Hoang2, Vien Vo1  , and Dinh Quang Khieu3 
1Faculty of Natural Science, Quy Nhon University, 590000, Viet Nam
2University of Science and Education, The University of Da Nang, 550000, Viet Nam
3University of Sciences, Hue University, 530000, Vietnam
Corresponding Author: Lan Nguyen Thi ,
Vien Vo ,Tel: +84-914908789, Email: vovien@qnu.edu.vn
Dinh Quang Khieu ,Tel: +84-368706850, Email: dqkhieu@hueuni.edu.vn
Received: February 28, 2024;  Accepted: June 6, 2024.
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In this study, activated carbon/g-C3N4 photocatalyst (BC/CN) was successfully prepared by a facile calcination method from activated carbons derived from banana peels and urea. As a result, the morphology of BC/CN consisted of the activated carbons highly dispersed on the g-C3N4 matrix. The advanced oxidation process of BC/CN and hydogen peroxide exhibits a better catalytic activity towards Rhdamine-B degradation in visible-light region than those of the pristine g-C3N4 or BC with hydrogen peroxide. The grafting of activated carbon to g-C3N4 enhanced the electron transfer efficiency and suppressed the photoinduced electron-hole recombination. Initial TOC was about 650 mg/L; however, it decreased by 93% to 60 mg/L after 60 min treating. After four cycles of experiments, the catalyst BC/CN still presented high activity for the degradation of RhB. In addition, all N-deethylation intermediates and several small molecular products were separated and identified by LC/MS method. Based on the analytical results, a possible mechanism of photocatalytic degradation was proposed. This work demonstrates a facile and efficient approach to improving the performance of g-C3N4-based catalysts.
Keywords: Activated carbon | g-C3N4 | Photocatalysis | Rhodamine B | Hydrogen peroxide
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