中文摘要：

采用低温水热法制备氢钛酸管，通过吸附-煅烧法制备Cu掺杂TiO2纳米管（Cu-TNT）催化剂．利用X射线衍射（XRD）、电感耦合等离子体．原子发射光谱（ICP—AES）、X射线光电子能谱（XPS）、透射电镜（TEM）、紫外．可见漫反射光谱（UV-Vis-DRS）和电化学测试手段对样品进行表征，并进行平面波赝势密度泛函理论（DFT）计算．结果表明，样品中Cu／Ti原子比接近理论值，Cu掺杂进入TiO2晶格内部，诱发催化剂可见光活性．掺Cu后，Cu3d轨道和O2p轨道杂化形成价带顶，价带负向偏移，样品禁带宽度减小为2．50-2．91eV,具有可见光响应．以甲苯为模型污染物研究催化剂对挥发性有机化合物（VOCs）的催化去除和矿化效果．未掺杂的TNT可见光催化活性较差；Cu掺杂量超过0.1％（Cu／Ti原子比）时，样品催化活性也减弱；Cu掺杂量为0．1％的催化剂具有最佳可见光催化氧化能力，7h内甲苯的去除率达77％，甲苯的矿化率达59％．

英文摘要：

Based on hydrogen titanate nanotubes prepared by a low-temperature hydrothermal technique, Cu-doped titania nanotube （Cu-TNT） catalysts were prepared using absorption-calcination methods. They were characterized by X-ray diffraction （XRD）, inductively coupled plasma-atomic emission spectroscopy （ICP-AES）, X-ray photoelectron spectroscopy （XPS）, transmission electron microscopy （TEM）, UV-Vis diffuse reflectance spectroscopy （UV-Vis-DRS）, and electrochemical techniques. Density functional theory （DFT） was used to calculate the nanotube band structure and density of states. Cu/Ti atomic ratios in the synthesized powders were very close to the nominal values, and the Cu-doped TiO2 lattice exhibited improved visible-light absorption. This was because the valence band, formed by hybridization of O 2p states with Cu 3d states, was negatively shifted. Thus, the band gap was reduced to 2.50-2.91 eV and the samples exhibited visible-light responses. Toluene was chosen as a model pollutant to evaluate the removal capacity and the CO2 mineralization rate of volatile organic compounds under visible light. Pure TNT displayed poor visible-light activity, and the activities of samples with 〉0.1% Cu doping were also weak. Samples doped with 0.1% Cu exhibited optimum visible-light photocatalytic oxidation activity, with a 77% toluene degradation efficiency and a 59% mineralization rate in7h.