中文摘要：

光催化氧化技术是近20年来新兴的一种环境净化技术，因其可以将难降解有机污染物降解为对环境无害的化合物，甚至实现完全矿化，不存在二次污染问题，已经受到了人们越来越多的关注，TiO2催化剂的固定解决了TiO2颗粒回收困难的问题，但由于有效利用面积减少，在光催化过程中出现的量子效率低的问题就更加突出，因此如何提高光催化的量子效率就成为光催化研究的焦点，研究结果表明，电助光催化可有效地抑制光致空穴和电子的复合而提高量子效率．与TiO2膜电极相比，TiO2纳米管电极具有更大的比表面积和较高的吸附能力，将会大大改善TiO2的光电催化性能，并可进一步提高光电化学性能。

英文摘要：

In this paper, vertically aligned nanotubes arrays of titanium oxide were fabricated on the surface of titanium substrate by direct anode oxidation with HF being the supporting electrolyte. Under the condition of applying the same bias on the electrodes, a higher anodic photocurrent of the TiO2 nanotubes electrode was obtained than that of TiO2 film electrode, which is due to the larger specific surface area, novel microstructure and higher efficient surface-interface electron migration of nanotube electrode. The degradation of a textile azo dye, Acid Orange 7 （ electrocatalytic （ PEC ） AO7）, in aqueous solution with TiO2 nanotubes electrode was carried out using photoprocess, comparing with electrochemical process（EP） and photocatalytic （PC）. A significant photo-electrochemical synergetic effect was observed. The reason is attributed to the surface state characteristics and higher separation efficiency of photo-generated charge carrier of nanotube system.