摘要：

以乙醇为溶剂，采用溶剂热法合成CdS@g-C₃N₄复合材料，利用SEM、XRD、UV-Vis等对其进行结构和形貌表征。以亚甲基蓝（MB）为降解底物，在模拟太阳光下考察了CdS@g-C₃N₄的光催化降解活性。结果表明，50% CdS@g-C₃N₄对MB的降解效率30 min就达到90%以上。在相同反应条件下，CdS@g-C₃N₄复合材料比纯g-C₃N₄以及CdS具有更高的催化活性。CdS在CdS@g-C₃N₄复合材料中的作用主要有：提高了材料的光吸收能力，提高了对有机污染物的吸附能力，同时促进了光生电子-空穴对的分离。此外，CdS@g-C₃N₄光催化剂在循环测试中表现出了足够的催化稳定性。

关键词: CdS, g-C₃N₄, 光催化, 溶剂热法, 降解

Abstract:

Taking ethanol as solvent, CdS@g-C₃N₄ composites was synthesized by solvothermal method, and the structure and morphology of CdS@g-C₃N₄ were characterized by SEM, XRD, UV-Vis, etc. Using methylene blue(MB) as the degradation substrate, the photocatalytic degradation activity of CdS@g-C₃N₄ was investigated under simulated sunlight. The results showed that the degradation efficiency of MB on 50%CdS@g-C₃N₄ reached above 90% in 30 min. Under the same reaction conditions, the CdS@g-C₃N₄ composite showed higher catalytic activity than pure g-C₃N₄ and CdS. The role of CdS in CdS@g-C₃N₄ composite materials mainly include as follows:improving the light absorption capacity of the material and the adsorption capacity of organic pollutants, promoting the separation of photogenerated electron-hole pairs. In addition, the CdS@g-C₃N₄ photocatalyst exhibits sufficient catalytic stability in the cycle test.

Key words: CdS, g-C₃N₄, photocatalysis, solvothermal, degradation

中图分类号: 

• X703.1