Microstructure and photocatalytic performance of the nano-TiO_2 film

Nano-TiO_2 films were prepared by sol-gel method on the normal glass substrates using Ti(OBu) as(precursor).The microstructure and UV absorbability of films were measured by using XRD,UV-VIS technology.The photocatalytic activity of TiO_2 films was evaluated by the degradation of the cooking oil.The influences of dipping-layers and calcinations temperature of the films on crystalloid microstructure and photocatalytic activity were investigated.The results show that the TiO_2 thin films are of anatase and rutile phase structures at 450 ℃.When heated up to 700 ℃,the structure of TiO_2 film changed into rutile completely.The calcinations temperature at 450-490 ℃ is efficient and photocatalytic activity at 480 ℃ is better.The photocatalytic activity of films is higher when the thickness of films is much thicker.The photocatalytic activity of eight-layer film is the highest.