期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 601, 期 -, 页码 196-208出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.05.124
关键词
CeO2; C-doped g-C3N4; Photocatalytic degradation; Cr(VI) reduction
资金
- Program for the National Natural Science Foundation of China [51779090, 51879101, 51579098, 51809090, 51709101, 51521006, 51909084]
- National Program for Support of Top-Notch Young Professionals of China (2014)
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Natural Science Foundation [2020JJ3009]
- Hunan Researcher Award Program [2020RC3025]
- Hunan Provincial Science and Technology Plan Project [2017SK2243, 2018SK20410]
- Program for Ecological restoration and engineering in Chinese Academy of Sciences, Chongqing [E055620201]
The CeO2/CCN composite photocatalyst shows superior catalytic performance in tetracycline degradation, H2O2 production, and Cr(VI) reduction, attributed to the doping of carbon expanding the solar light utilization range, CeO2 enhancing the migration of photogenerated electrons, and excellent durability and stability.
In the present study, an innovative carbon self-doped g-C3N4 (CCN) loaded with ultra-low CeO2 (0.067-0.74 wt%) composite photocatalyst is successfully synthesized via a facile one-pot hydrothermal and calcination method. The CeO2/CCN exhibits superior photocatalytic performance for tetracycline degradation (78.9% within 60 min), H2O2 production (151.92 mu mol L-1 within 60 min), and Cr(VI) reduction (99.5% within 40 min), which much higher than that of g-C3N4, CCN, CeO2, and CeO2/g-C3N4. The enhanced photocatalytic performance is originated from the fact that the doping of C can efficaciously broaden the utilization range of solar light and improve the reduction ability of photogenerated electrons. Meanwhile, the ultra-low loading of CeO2 can effectually promote the migration of photogenerated electrons and enhance the specific surface area. Besides, the experiments of pH effect and cycle ability indicate that CeO2/CCN has excellent durability and stability. Finally, the photocatalytic mechanism of CeO2 CCN is systematically discussed. This work proves that combining element doping and semiconductor coupling is a promising strategy to design high-efficiency g-C3N4-based photocatalysts. (C) 2021 Elsevier Inc. All rights reserved.
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