WANG Xi-tao, QIN Chun-hong, ZHONG Shun-he, XIAO Xiu-fen

(Tianjin Key Laboratory of Applied Catalysis Science and Technology, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)

Abstract: A series of supported coupled-semiconductors of sulfide, ZnS-CdS/SiO₂, were prepared by incipient wet impregnation. XRD, TPR, UV-vis DRS and photo-stimulated surface reaction technologies were used to investigate the surface structure, photo absorption property and photocatalytic performance of coupled semiconductors. Results show that the chemical action between ZnS and CdS resulted in the formation of Cd_xZn_1-xS compound on the surface of the support. The coupled effects of ZnS and CdS were related with the ratio of ZnS/CdS and calcination temperature. When ZnS/CdS=1 and calcination temperature 450℃, the strongest chemical action between ZnS and CdS can be obtained. It indicates that the coupled effects of ZnS and CdS decrease the energy of band gap, and enhance photo absorption property and photocatalytic performance.

Key word: Coupled-semiconductors; Photocatalytic; Zinc sulfide; Cadmium sulfide

E-mail: shzhang@tju.edu.cn

Journal of Molecular Catalysis, Vol. 24, Issue 4, 2010, 358~362