Journal
CHEMOSPHERE
Volume 273, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.129746
Keywords
g-C3N4; WS2; Carbon film; Z-scheme; 2,4-dichlorophenol degradation
Categories
Funding
- National Natural Science Foundation of China [31470489]
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In this study, a novel Z-scheme heterojunction C@WS2/g-C3N4 composite was prepared with carbon as a bridge for improving the photocatalytic properties. The carbon film in the ternary composites acted as an electron-mediator, enhancing the separation and transportation of photogenerated charge, resulting in an excellent photo-degradation rate towards 2,4-dichlorophenol under visible light irradiation. The generated radicals and ions by the ternary composites effectively promoted the dechlorination reaction of 2,4-DCP, showcasing potential applications in environmental remediation.
A novel Z-scheme heterojunction C@WS2/g-C3N4 composite was prepared with carbon as a bridge for improving the photocatalytic property. The results of composition and structure studies demonstrate that the introduced carbon was deposited on the surface of WS2 with a film form in the ternary composites. The analysis of optical and photo-electrochemical properties reveals that the carbon film played as an electron-mediator in the ternary composites and could improve the separation and transportation of photogenerated charge. Meanwhile, it could change the pathway of photogenerated electrons between WS2 and g-C3N4, thereby constructing a Z-scheme heterojunction for maintaining the redox ability of photogenerated charge. The ternary 2%-C@WS2/g-C3N4 composite exhibited an excellent photo-degradation rate towards 2,4-dichlorophenol (2,4-DCP) under visible light irradiation, which was 3.15 and 3.06 times of the pure g-C3N4 and binary WS2/g-C3N4 composite, respectively. Besides, the degradation pathway of 2,4-DCP and photocatalytic degradation mechanisms were investigated and discussed in detail. The generated center dot O-2(-)-, center dot OH and h(+) by ternary composites could promote the dechlorination reaction of 2,4-DCP effectively and decompose it into smaller organic molecules. This work extends the design of g-C3N4-based 2D/2D heterojunction or Z-scheme photocatalysts to remediate the environment. (C) 2021 Elsevier Ltd. All rights reserved.
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