Abstract: TiO₂ films on the surface of Al₂O₃/Al and pure Al sheet were prepared by a dip-coating technique of TiO₂ colloid. The photocatalytic degradation of oleic acid and photocatalytic oxidation of C₂H₄ on the samples were studied by FTIR ATR technique and a batch reactor, respectively, and the photoinduced hydrophilic property of the samples was evaluated by water contact-angle. Compared to TiO₂/Al, TiO₂/Al 2O₃/Al showed a higher activity of photocatalytic degradation for oleic acid, but lower activity of photocatalytic oxidation of C₂H 4 and poorer photoinduced hydrophilic property. The diversity could be explained with the help of difference of the reaction mechanism and the transfer of electron between Al and TiO₂. The result suggests that photocatalysis and photoinduced hydrophilicity of TiO₂ film are dependent and independent on each other.

Key words: Photocatalysis, Photoinduced hydrophilic property, TiO₂ film, Al sheet, Electron transfer