The Preparation of Nano-TiO2 Films Doped with ZnO or Fe2O3

Prepare TiO2doped with ZnO or Fe2O3composite photocatalytic film by using sol-gel method and characterize its microstructure and light absorption performance with X-ray diffraction instrument (XRD), scanning electron microscopy (SEM) and UV-visible spectrophotometer. The results show that: particles of TiO2doped with Fe2O3composite photocatalytic film are uniform and well dispersed; the rough surface of the film has a certain gap which is helpful for the adhesion of gas and liquid; the diameter of the particles is about 50 nm. The crystal grain size of TiO2film doped with ZnO is bigger, about 100 nm; the gap of the film is less and particles are nearly spherical and protruding, the shape of grain is structured. The absorption spectrum of TiO2doped with ZnO or Fe2O3has a red shift and both of their absorption intensity is higher than that of pure TiO2film in the scope of the ultraviolet and visible region.