Preparation and Photocatalytic Properties of Terrace Composite SnO_2/ TiO_2: Cu~(2+) Film

摘要

Nano-SnO_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_2TiO_2 films ; UV-Vis showed the absorbance at visible region increased comparing to pure TiO_2 and mixed SnO_2TiO_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.