文章采用水热法制备SiO2-TiO2纳米管,通过扫描电镜(SEM)和透射电镜(TEM)考察了该纳米管的结构形态,并用X-射线衍射考察其晶体结构。实验结果表明所制得的纳米管是锐钛晶型,其两端开口,具有多层管壁;管径为8nm左右,管壁厚1～2nm。光催化降解酸性橙Ⅱ实验表明:SiO2-TiO2纳米管光催化速率比TiO2纳米管高出10%。这可能是因为Si元素的存在增大了钛纳米管的比表面积,同时SiO2的存在能降低光生电子和空穴的复合率。 In this paper, SiO2-TiO2 nanotubes were prepared by hydrothermal method. The morphology of the nanotube was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The crystal structure of the nanotube was investigated by X-ray diffraction. The experimental results show that the prepared nanotubes are anatase crystal and have open ends at both ends with multilayer tube wall; the tube diameter is about 8 nm and the tube wall thickness is 1 ~ 2 nm. Photocatalytic degradation of acid orange Ⅱ experiments show that: SiO2-TiO2 nanotubes photocatalytic rate higher than TiO2 nanotubes 10%. This may be due to the presence of Si element increases the specific surface area of ​​titanium nanotubes, while the presence of SiO2 can reduce the recombination rate of photogenerated electrons and holes.