采用水热法, 制得了管径约为10~15 nm、管长约为10~300 nm、管壁上附着NiO纳米颗粒的TiO2纳米管复合光催化剂（NiO/TiO2).采用X射线衍射、透射电子显微镜、扫描电镜、X射线光电子能谱及紫外-可见漫反射光谱等技术对催化剂进行了表征; 以甲基橙为模拟污染物, 评价了纳米管的光催化活性.结果表明：NiO晶粒与TiO2晶粒结合形成p-n异质结, 有效地促进了光生电子和空穴的分离; NiO对可见光有强烈的吸收, 使复合TiO2纳米管在整个可见光区域均有很好的光吸收; 以上两点使NiO/TiO2纳米管可见光下的光催化活性大幅提升, 500℃煅烧后纳米管对甲基橙1 h分解比由纯TiO2纳米管的7.0%提升至NiO/TiO2纳米管的95.6%.

TiO2 nanotubes loaded NiO nanoparticles were prepared by hydrothermal method, which diameter and length are 10~15 nm and 10~300 nm, respectively. The nanotubes were characterized by X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, X-ray photoelectron spectroscopy and uv-visible diffuse reflection spectrum. The photocatalytic activities of the nanotubes were evaluated according to their photodegradation behavior on methyl orange. The results show that TiO2 and NiO grains are well integrated and form the p-n junction, promote the separation of photogenerated electron-hole pairs. NiO/TiO2 nanotubes have good absorption performance in the visible light region result from the strong visible light absorption of NiO. The above two factors lead to a significant increase in photocatalytic performance of NiO/TiO2 nanotubes under visible light. Thereby, the 1 h photocatalytic degradation rate of methyl orange increased from 7.0% of pure TiO2 nanotubes to 95.6% of NiO/TiO2 nanotubes after calcination at 500℃.