Influence of Bi 3+ Doping on Photocatalytic Activity of TiO 2 Film

With the approach of anodic oxidation, TiO2/Ti film doped with Bi 3+ was produced in H2SO4 electrolyte mixed with Bi(NO3)3·5H2O. The surface morphology were studied with scanning electron microscopy. The phase composition of the films was studied by X-ray diffraction. The photocatalytic activity of the films was compared through the photocatalytic degradation rate of Rhodamine B. The relations of the photocatalytic activity to the concentration of Bi 3+ , the microstructure of the film were investigated. The results showed that Bi 3+ increased the surface roughness and restrained the growth of crystal. In addition, the Rhodamine B was successfully photodegraded under UV illumination by Bi 3+ -TiO2/Ti film. It was found that the highest degradation rate of rhodamine B was achieved through an optimal Bi 3+ dosage of 0.6mol/L in Bi 3+ -TiO2/Ti film. Compared with TiO2/Ti film, the recombination rate of e - and h + of Bi 3+ -TiO2/Ti