Electrodeposition of photocatalytic TiO_2 film on surface of alumina prepared by anodic oxidation

摘要

A new electrochemical method to prepare photocatalytic TiO_2 thin film was developed, by which the TiO_2 was electrodeposited on surface of alumina by AC electrolysis in solution consisting of K_2 [TiO(C_2O_4 )_2 ] and C_2H_2O_4. The deposited TiO_2 thin film was primarily characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and energy dispersive spectrum (EDS) methods. The photocatalytic properties of this film were also studied by the photocatalytic degradation of methyl orange. The results show that the TiO_2 film electrodeposited by this method is mainly in amorphous and with a little crystalline component mixed anatase and rutile. The surface of the alumina prepared by anodic oxidation is porous and the TiO_2 electrodeposited on it is scattered and incompact. TiO_2 thin film fixed on the surface of alumina shows photocatalytic activity to the degradation of methyl orange.