铝材表面状态对TiO_2薄膜光催化性能和光致亲水性的影响

Effect of Surface State of Al Sheet on Photocatalytic Behavior and Photoinduced Hydrophilicity of TiO_2 Film

在纯铝片和具有氧化铝层的铝片上用提拉法制备 Ti O2 /Al和 Ti O2 /Al2 O3/Al样片 ,通过 FTIR ATR技术和密闭间歇式反应装置分别考察了 Ti O2 薄膜对油酸和乙烯的光催化降解性能 ,通过测试接触角考察Ti O2 薄膜的光致亲水性 .结果表明 ,Ti O2 /Al2 O3/Al对油酸的光降解性能比 Ti O2 /Al的好 ,但其光催化氧化乙烯性能和光致亲水性能较差 .这种差别可通过不同过程的作用机理和 Al与 Ti O2 表面的电子转移作用得到较好解释 ,由此得出 Ti O2

TiO 2 films on the surface of Al 2O 3/Al and pure Al sheet were prepared by a dip-coating technique of TiO 2 colloid. The photocatalytic degradation of oleic acid and photocatalytic oxidation of C 2H 4 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 TiO 2/Al, TiO 2/Al 2O 3/Al showed a higher activity of photocatalytic degradation for oleic acid, but lower activity of photocatalytic oxidation of C 2H 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 TiO 2. The result suggests that photocatalysis and photoinduced hydrophilicity of TiO 2 film are dependent and independent on each other.