Improvement and Characterization of TiO2 Film Photocatalyst

The paper describes the preparation of the TiO2thin film photocatalyst by power-solmethod. The photocatalytic activity of the catalyst was evaluated by measuring the decomposition of gaseous acetone under weak UV light illumination. The result showed that the photocatalytic activity was remarkably enhanced by the addition of the TiO2powder in the TiO2film. And the weight of the PS-TiO2film is 5 times less than that of the SG-TiO2film system. According to the SEM pictures, the reason maybe as that: The film via power-sol (PS-TiO2film) is more coarse than the film via sol-gel(SG-TiO2film), so the surface area is big and it is good for the photoefficent of UV light and reaction rate. Furthermore, adding TiO2powders into the starting solution induces much defect on the film and this is also benefit for the reaction rate. Last, the SG- TiO2film is so thick that it maybe has exceeded the best thickness of the film. Moreover, adding acid into the film can improve the photoreactivity of the film. Because acid can prevent the producing of Ti3+and it is benefit for the separation of photoelectron and photohole. Furthermore, decreasing the amount of Ti3+can increase the amount of O2-. O2-is also good for the photoreactivity of the film.