Studies on Preparation and Photocatalytic Activities of TiO_2 Films

TiO2 films were prepared using a solgel method by dippinglifting manner on the surface of glass pipes. The prepared TiO2 films are very uniformity and firm. Photocatalytic degradation of heptane was studied, and the results show that the photocatalytic activity of TiO2 films increases gradually with the decreasing of heating temperature, and the heptane can be mineralized completely. For the TiO2 films calcined at 300 ℃, with the increasing of coating cycles, photocatalytic activity of TiO2 films increases gradually, and the stability of films is good to be deposited for a long time and be used repeatedly. The photocatalytic degradations of acetone, benzene, toluene and 1,2dichloroethene ethane were also studied on TiO2 films. The results show that benzene and toluene are degraded slowly, while heptane acetone and 1,2dichloroethene ethane can be degraded quickly to produce chemical metrological ratio carbon dioxide.