(1. 中南大学 材料科学与工程学院，长沙 410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室, 长沙 410083；
3. 玉林师范学院 化学系，玉林 537000)
摘 要: 采用改进的化学沉积法，用ZnO对TiO2−纳米管进行改性，制备ZnO/TiO2−纳米管的复合半导体材料。用X 射线衍射仪、透射电镜、高分辨透射电镜、X 射线能谱仪、比表面分析仪，紫外−可见光度计等研究样品的结构、表面形貌和化学组成。通过光降解甲基橙模拟污染物考察其光催化性能，并探讨ZnO粒子表面修饰增强TiO2−纳米管光催化活性的机制。结果表明：n(Zn)׃n(Ti)为1׃4的ZnO/TiO2−纳米管复合材料具有最佳的光催化活性；Zn和Ti的协同效应改善了复合材料的可见光响应性。
关键字: TiO2-纳米管; ZnO; 表面修饰; 可见光; 光催化机理
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 4, 10083, China;
3. Department of Chemistry, Yulin Normal University, Yulin 537000, China）
Abstract:TiO2-nanotubes(TiO2-NTs) coated with nanosized ZnO particles were synthesized by a modified deposition- precipitation process. The obtained products were characterized by XRD, TEM, HRTEM, XPS, BET and UV-Vis to reveal the structures, micrography and composition of ZnO/TiO2-NTs. The photodegradations of methyl orange with ZnO/TiO2-NTs as photocatalysts were carried out to investigate the photocatalytic activity of ZnO/TiO2-NTs. The photocatalytic mechanism for ZnO/TiO2-NTs with high photocatalytic activity was proposed. The results show that the ZnO/TiO2-NT with molar ratio of Zn to Ti of 1׃4 exhibits excellent photocatalytic activity for photodegradation of methyl orange. The enhanced photocatalytic activities for ZnO/TiO2-NTs own to the synergistic effect of Zn and Ti, resulting in the improved response to UV-Vis light.
Key words: TiO2-nanotube; zinc oxide; surface modification; visible light; photocatalytic mechanism
