Some Influencing Factors on Photocatalytic Activity of TiO2 Film Prepared Using Sol-Gel Method

Subscript text TiO2 film was deposited on glass substrate by a sol-gel process. The influences of the SiO2 layer, distance between lamp and solution, and air flow rate were investigated. Methyl orange can be hardly degraded under UV light exposure alone. The adsorption rate of methyl orange on TiO2 film is negative after 25 min of stirring. Although distance between the lamp and the solution varies from 5.5 cm to 7.5 cm, the degradation rates decline slightly. There is nearly no influence of air flow rate on the entire degradation ability of the photocatalyst. SiO2 film coated on microscope glass slide has no photocatalytic activity under UV irradiation. In prior to deposit TiO2 film onto the surface of the glass substrate, a SiO2 thin layer is coated. The results indicate that the TiO2 film with SiO2 layer has much better photocatalytic activity that the film without SiO2 layer.