期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 895, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162667
关键词
delta-Bi2O3; Highly crystalline carbon nitride; Z-scheme; 2D/2D; Tetracycline
资金
- National Natural Science Foundation of China [21906072, 22006057]
- Natural Science Foundation of Jiangsu Province [BK20190982]
- Henan Postdoctoral Foundation [202003013]
- Doctor of Mass entrepreneurship and innovation Project in Jiangsu Province
A high-efficiency composite photocatalyst HCCN/BO was synthesized, and the optimized sample showed a degradation rate of 90% for TC, demonstrating significant efficacy. The enhancement of photocatalytic activity is mainly attributed to the formation of 2D/2D heterojunction and the adoption of the Z-scheme.
Photocatalytic degradation of antibiotic pollutant from contaminated water is essential for environmental protection. Rational development and design of composite photocatalyst with high catalytic activity and stability plays an important role in the photocatalytic field. Herein, 2D/2D highly crystalline carbon nitride/delta-Bi2O3 (HCCN/BO) Z-scheme heterojunction photocatalyst was synthesized via a facile solvothermal strategy. Experimental results show that the optimal HCCN/BO-3 sample exhibits a similar to 90% degradation rate during the photocatalytic degradation of the tetracycline (TC) within 60 min. The enhancement of photo catalytic activity is mainly attributed to the two reasons as follows: (i) the formation of 2D/2D heterojunction shortens the distance of the carriers from the body to the surface and gives two kinds of semiconductors rich active sites, improving the production and separation efficiency of photogenerated active carriers; (ii) the transmission path of photo-induced electrons follows the Z-scheme that can effectively inhibit the recombination of electrons and holes, expand the wide band gap, and harvest more visible light, separate oxidation and reduction active sites to retain redox capacity. Finally, the intermediate in the degradation pathway is determined using liquid chromatography-series mass spectrometry (LC-MS), and the TC degradation pathway for the photocatalytic reaction process of this composite system is proposed. (C) 2021 Elsevier B.V. All rights reserved.
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