FANG Yiwen, YU Lin, YE Fei, SUN Ming
(1. Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China 2. Department of Chemistry, Shantou University, Shantou 515063, China)
Abstract: Ag-modified TiO2 catalysts were synthesized by sol-gel method and characterized by XRD, SEM, BET, O2-TPD and UV-Vis DRS. The results showed that the Ag-TiO2 catalysts demonstrated smaller particle sizes, larger specific surface areas and higher absorbing ability in visible light when compared with TiO2 catalyst. The surface adsorbed oxygen and Ag electron trapping center also appeared on the Ag-TiO2 catalysts. The single-pass degradation rate of toluene reached 42.9% when the Ag/Ti atomic ratio was 1.6%. The catalysts were transfered from pure anatase phase to anatase-rutile composite phase when the calcination temperatures were increased. The coexisting of anatase phase and rutile phase with appropriate ratio can reduce the recombination probability of the electron-hole pairs and enhance the toluene degradation activities.
Key words: Ag; TiO2; Modify; Toluene; photocatalytic degradation
E-mail: gych@gdut.edu.cn
Journal of Molecular Catalysis, Vol. 25, Issue 6, 2011, 569-573
