三元运算
光催化
光降解
异质结
材料科学
复合数
化学工程
2,4-二氯苯酚
降级(电信)
可见光谱
碳纤维
光化学
石墨氮化碳
催化作用
化学
复合材料
光电子学
有机化学
计算机科学
遗传学
细菌
程序设计语言
电信
工程类
生物
出处
期刊:Chemosphere
[Elsevier]
日期:2021-06-01
卷期号:273: 129746-129746
被引量:25
标识
DOI:10.1016/j.chemosphere.2021.129746
摘要
A novel Z-scheme heterojunction [email protected]2/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%[email protected]2/g-C3N4 composite exhibited an excellent photodegradation 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 ·O2−-, ·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.
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