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 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.

以碳为桥基，制备了一种新型的Z型异质结C @ WS ₂ / gC ₃ N ₄复合材料，以提高光催化性能。组成和结构研究的结果表明，引入的碳以三元复合材料中的薄膜形式沉积在WS ₂的表面上。光学和光电化学性质的分析表明，碳膜在三元复合物中起电子介体的作用，并可以改善光生电荷的分离和传输。同时，它可以改变WS ₂和gC ₃ N ₄之间的光生电子的路径。，从而构建用于维持光生电荷的氧化还原能力的Z型异质结。三元2％-C @ WS ₂ / gC ₃ N ₄复合材料在可见光照射下对2,4-二氯苯酚（2,4-DCP）表现出优异的光降解速率，是纯gC ₃ N的3.15和3.06倍₄和二进制WS ₂ / gC ₃ N ₄复合。此外，对2，4-DCP的降解途径和光催化降解机理进行了详细的探讨。所生成·O2 ₂ ^-，·OH和H ⁺三元复合材料的合成可以有效地促进2,4-DCP的脱氯反应并将其分解为较小的有机分子。这项工作扩展了基于gC ₃ N ₄的2D / 2D异质结或Z型光催化剂的设计，以修复环境。