中文摘要：

以金红石相二氧化钛（TiO2）粉体为原料，采用水热法合成了二氧化钛纳米管（TNTs），在碱性条件下与AgNO3的乙二醇溶液反应，得到表面载Ag的二氧化钛纳米管（Ag／TNTs）。利用透射电镜（TEM）、电子衍射能谱（EDS）、X射线衍射（XRD）、X射线光电子能谱（XPS）和紫外-可见光谱（UV—Vis）对产物进行了表征，重点研究了Ag／TNTs对甲基橙（MO）紫外光催化降解性能。结果表明，经Ag表面修饰后，纳米管的晶型结构没有发生明显变化，并且Ag粒子能很好地分散在纳米管的外表面。Ag粒子的直径约为4nm，以单质Ag的形态存在。Ag／TNTs在可见光区域表现出较强的吸收，光催化降解甲基橙实验结果表明，Ag／TNTs的光催化活性较金红石相二氧化钛粉体和纯TNTs有着显著的提高。

英文摘要：

Titania nanotubes （TNTs） were synthesized by hydrothermal treatment of mille-phase TiO2 nanoparticles in 10 mol＇L^-1NaOH solution at 110℃ for 24 h. The Ag loaded titania nanotubes （Ag/TNTs） were obtained by chemical deposition method with the TNTs suspending in the AgNO3 solution （pH=8） at 50℃. The characterizations of the assynthesized samples were performed b.y TEM, EDS, XRD, XPS, and UV-Vis spectra. The photocatalyilc performance of the Ag/TNTs was investigated by UV-light induced photocatalytic decomposition of methyl orange（MO）. The results showed that the inner/outer diameters of TNTs were about 6/10 nm and the length was several hundred nanometers. Both the shape and the crystalline of the nanotubes were not changed after the modification. The zero oxidation state Ag quantum dots, about 4 nm in diameter, were well dispersed on the external surface of the nanotubes. Ag/TNTs exhibited enhanced absorption at the visible range in the UV-Vis spectra. The Ag nanoparticles were found to significantly enhance the photocatalyiic activity of TiO2 nanotubes, and the catalyst system was demonstrated to be highly efficient for the UV-light induced photocatalyiic decomposition of MO compared to both mille-phase TiO2 nanoparticles and pure TNTs. After irradiation for 60 min, the decomposition rates of MO solution in mille-phase TiO2 nanoparilcles, TNTs, and Ag/TNTs system were 46.8%, 57.2%, and 92.2%, respectively.