分别通过阳极氧化法和电沉积法制备了TiO_2纳米管及铜掺杂的TiO_2纳米管(CuxOy/TiO_2纳米管)复合材料。利用X射线粉末衍射仪、扫描电子显微镜和X射线能谱分析等手段对材料进行表征。结果表明:用阳极氧化法制备的TiO_2纳米管为锐钛矿型,平均管直径为90~110nm,平均管长为300nm左右;采用电沉积法制备的CuxOy/TiO_2纳米管中铜以CuO的形式存在。在密封悬挂式光催化系统中,研究不同浓度CuSO_4电镀液制备的CuO/TiO_2纳米管对CO_2的光催化还原行为。在500W氙灯光照的条件下,TiO_2纳米管和CuO/TiO_2纳米管还原CO_2的产物是CO和CH_4;TiO_2纳米管在光照6h时,CH_4的产率达到1.3×10~(-6)/(cm~2·h),而0.04mol/L CuSO4电镀液制备的CuO/TiO_2纳米管在同样条件下,CH_4的产量达到3.7×10~(-6)/(cm~2·h)。这说明CuO/TiO_2纳米管显著提高了CO_2的光催化还原效率。 TiO 2 nanotubes and copper-doped TiO 2 nanotubes (CuxOy / TiO 2 nanotubes) composites were prepared by anodic oxidation and electrodeposition respectively. The materials were characterized by X-ray powder diffraction, scanning electron microscopy and X-ray energy spectrum analysis. The results show that the TiO 2 nanotubes prepared by anodic oxidation are anatase, the average tube diameter is 90 ~ 110 nm and the average tube length is about 300 nm. The copper in the CuxOy / TiO 2 nanotubes prepared by electrodeposition is in the form of CuO exist. In a sealed suspended photocatalytic system, the photocatalytic reduction of CO 2 by CuO / TiO 2 nanotubes prepared with different concentrations of CuSO 4 plating solution was studied. Under the illumination of 500W xenon lamp, the products of CO_2 and CO_2 were reduced by TiO_2 nanotubes and CuO / TiO_2 nanotubes. The yield of CH_4 reached 1.3 × 10 ~ (-6) / cm ~ 2 · h). However, the yield of CH_4 reached 3.7 × 10 -6 / cm 2 under the same conditions for the CuO / TiO 2 nanotubes prepared with 0.04 mol / L CuSO 4 plating solution. This shows that CuO / TiO 2 nanotubes significantly improve the CO 2 photocatalytic reduction efficiency.