Study Of TiO₂ Photocatalytic Thin Films With The Function Of Anti-Fog And Self-Cleaning

The paper discussed the development and current situation of titanium dioxide photocatalytic hydrophilic material based on a large number of data from domestic and abroad. The theory of titanium dioxide thin-film hydrophilicity and the preparation process were studied. TiO₂ thin films, TiO₂-SiO₂ thin film and TiO₂-SiO₂-WO3 films were successfully synthesized, the results show that the hydrophilicity of TiO₂ thin films is improved by adding SiO₂, WO3, TiO₂-SiO₂-WO3 composite film gets the best result.The TiO₂ thin film with anti-fog and self-cleaning function were successfully prepared by Sol-gel method, the optimum preparation conditions of TiO₂ thin films were determined. The paper studied the influence of calcination temperature, the coating layer, and the temperature speed on the TiO₂-SiO₂ composite film hydrophilic activity. The results show that when the calcination temperature is 500℃, three-layer, the speed of temperature is 5℃/min, and the SiO₂ and TiO₂ molar ratio is 1:4, the TiO₂ thin films have a high hydrophilic activity.The hydrophobic properties of TiO₂-SiO₂-WO₃ ternary composite films were studied by the orthogonal experiment. The results show that: the super-hydrophilic TiO₂ composite film has good anti-fog effect by adding 10 ml SiO₂ and 0.8 ml WO3, the calcination temperature is 500℃and the rate of temperature increase is 5℃/min,.The maintenance of the TiO₂-SiO₂-WO₃ ternary composite films was studied in the dark, the results show that: the film can maintain the super-hydrophilic propertie for 5 days.The influences of the initial concentration of methyl orange,the mix , the UV irradiation time on the photocatalytic activity of titanium dioxide were studied. The result shows that the TiO₂ thin film has a better photocatalytic activity by degradation of methyl.