Zhou Peng1, Lu Gongxuan1,2, Ma Jiantai1
(1 The college of Chemistry and Chemical Engineering, Lanzhou University, Tianshui South Road 222, Lanzhou, 730000; 2 Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Zhong Road 18, Lanzhou, 730000 )
Abstract: ZnS-CdS/SiO2 photocatalysts were prepared by co-precipitation method using Na2S and H2S as sulfur source respectively. The resulting photocatalysts were characterized by HRTEM, XPS, and XRD techniques. The effects of sulfur sources on the surface structure of photocatalysts and their photocatalytic activities for H2 production were investigated. Results showed that the ZnS-CdS can be deposit efficiently on SiO2 when Na2S was used as a sulfur source. That catalyst exhibited a surface structure with a CdS core and ZnS shell. The surface structure and component concentration were dependent on pH values of solution. The loading amounts of ZnS-CdS showed significantly influence on the activities. When H2S was used for preparing photocatalysts, the interaction between ZnS-CdS and SiO2 increased with the increase of pH values of solution, which promoted the activity for hydrogen generation.
Key words: ZnS-CdS; SiO2; surface structure; visible light; hydrogen generation
E-mail: gxlu@.1zb.ac.cn
Journal of Molecular Catalysis, Vol. 25, Issue 4, 2011, 328~335
