Preparation and Photocatalytic Properties of Terrace Composite SnO₂/TiO₂:Cu²⁺ Film

Abstract

nanoSnO 2 and Cu-doped TiO 2 gelatins were prepared by sol-gel method, coated onto glass substrates by spin coating method, followed by drying at low temperature and calcined at high temperature, the influence on the structure and properties made by doping amount and composite form was discussed about. The films were characterized by XRD, SEM , EDS and UV-Vis, the photocatalysis degradation efficiency was studied as well. The results showed that the SnO 2 / TiO 2 :Cu 2+ films were anatase structure, the surface were flat and stable without obvious crack, average diameter was about 20 nm. EDS indicated that Cu was introduced to TiO 2 stratum of the SnO 2 TiO 2 films ; UV-Vis showed the absorbance at visible region increased comparing to pure TiO 2 and mixed SnO 2 TiO 2 system. The degradation experiment under UV light showed degradation efficiency of SnO 2 / TiO 2 : Cu 2+ films was higher compared with the mixed structure films, When the doping amount of Cu increased to 10% (mole fraction), the photocatalysis degradation efficiency reached its maximum.