Effect of Cs+, Ag+, Fe³+ Doping and Ag+, Fe³+ Co-Doping Contents on Photocatalytic Activity of TiO2 Films

Using tetra butyl titanate as raw material, the Cs⁺, Ag⁺,Fe³⁺-doped and Ag⁺, Fe³⁺ co-doping contents nano-titanium dioxide (TiO₂) film were prepared on a transparent glass slide by the sol-gel technique. The thin film samples were characterized by ultraviolet-visible (UV-Vis) spectrophotometer and X-ray diffraction. The effects of Cs⁺, Ag⁺,Fe³⁺-doped and Ag⁺, Fe³⁺ co doping dopant on absorption spectra of thin TiO₂ films were studied. Using Escherichia coli as target, the effects of Cs⁺, Ag⁺,Fe³⁺-doped and Ag⁺, Fe³⁺ co-doping doping amount on the photocatalytic sterilizing properties of TiO₂ thin film were investigated. The results show that doping Cs⁺, Ag⁺,Fe³⁺-doped and Ag⁺, Fe³⁺ co-doping in TiO₂ thin film cause the red-shift of the optical absorption edge, and its UV-Vis light absorption increases; when the doped amount of Cs⁺, Ag⁺,Fe³⁺-doped and Ag⁺, Fe³⁺ co-doping are 03%o,l%o,0.5%o and 0.3%, the photocatalytic activity of TiO₂, thin film can be improved effectively, and its sterilizing rate reach 97.18%,90.00% and 84.00%.