CdS/BiVO4复合半导体制备及其光催化性能

Preparation and photocatalytic activity of CdS/BiVO4 composite semiconductor

采用水热法以BiVO4纳米片为基体原位生长CdS晶体,得到CdS/BiVO4复合光催化剂,利用XRD、SEM、UV-Vis DRS等方法对材料进行了表征,通过降解亚甲基蓝对样品的光催化性能进行评价。结果表明,BiVO4为方形片状颗粒,其表面附着棒状CdS纳米颗粒,分散较好。CdS/BiVO4复合光催化剂表现出较高的光催化活性,在可见光照射下,利用CdS/BiVO4光催化降解亚甲基蓝,60 min后的降解率达94.79%,相比于纯相BiVO4和CdS有显著提高,且对多种有机染料均有良好的降解效果,重复使用性较好。机理研究发现,超氧自由基(·O2^-)是CdS/BiVO4光催化降解亚甲基蓝的主要活性物种。

CdS/BiVO4 composite photocatalyst was prepared via loading with CdS crystals on BiVO4 nano-flake matrix by hydrothermal method and was characterized by XRD,SEM,UV-Vis DRS and other means.The photocatalytic properties of the samples were investigated by degrading methylene blue.The results show that a large number of rodlike CdS nanoparticles were uniformly attached to the surface of nano-flake BiVO4 particles.The photocatalytic degradation of methylene blue by CdS/BiVO4 showed a degradation rate of 94.79%after 60 min visible light irradiation,significantly higher than that of both pure BiVO4 and CdS.In addition,CdS/BiVO4 has a good degradation effect on a variety of dyestuffs and has a good reusability.It was found that superoxide radical(·O2^-)was the main active species in photocatalytic degradation of methylene blue by CdS/BiVO4.