ZnO/TiO_2-纳米管光催化剂的制备与表征  

Synthesis and characterization of ZnO/TiO_2-nanotubes photocatalyst

作　　者：朱磊[1,2] 段学臣[1,2] 蒋波[1,2] 刘扬林[1] 刘国聪[1,3] 张智建[1,2] 

机构地区：[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

出　　处：《中国有色金属学报》2010年第7期1382-1389,共8页The Chinese Journal of Nonferrous Metals

基　　金：湖南省科技计划资助项目(2009FJ3097);长沙市科技计划资助项目(K0902131-11);广西青年基金资助项目(0728107)

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。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.

关 键 词：TiO2-纳米管 ZNO 表面修饰 可见光 光催化机理 

分 类 号：TB332[一般工业技术—材料科学与工程] TB34