脉冲沉积制备Cu2O/TiO2纳米管异质结的可见光光催化性能

摘要

Highly ordered TiO2 nanotube arrays (TNAs) were fabricated by an electrochemical anodization process and Cu2O nanoparticles were subsequently deposited onto these TNAs via pulse deposition to form Cu2O/TiO2 nanotube heterojunction composite materials. Samples were characterized by field emission scanning electron microscopy (FESEM), field emission transmission electron microscopy (FETEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffusion reflection spectroscopy (DRS). The photocatalytic performances of the Cu2O/TiO2 composites were investigated by fol owing the visible-light induced photocatalytic decomposition of methyl orange (MO). The results indicated that the inner surfaces and interfaces of the TNAs had been successful y modified with uniformly distributed Cu2O nanoparticles, and that these composites could effectively improve the visible light photocatalytic performance. The Cu2O/TiO2 nanotube composite obtained using 0.01 mol∙L-1 CuSO4 solution exhibited the best photocurrent and photocatalytic performance. Based on the results obtained, a possible photocatalytic mechanism is also discussed.%在用阳极氧化法制备有序排列TiO2纳米管阵列薄膜的基础上，引入脉冲沉积工艺，成功实现了均匀、弥散分布的Cu2O纳米颗粒修饰改性TiO2纳米管阵列，形成Cu2O/TiO2纳米管异质结复合材料.利用场发射扫描电镜(FESEM)、场发射透射电镜(FETEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis DRS)对样品进行表征，重点研究了Cu2O/TiO2纳米管异质结的光电化学特性和对甲基橙(MO)的可见光催化降解性能.结果表明， Cu2O纳米颗粒均匀附着在TiO2纳米管阵列的管口和中部位置，所制备的Cu2O/TiO2纳米管异质结具有高效的可见光光催化性能；在浓度为0.01 mol∙L-1的CuSO4溶液中制得的Cu2O/TiO2纳米管异质结表现出最好的电化学特性和光催化性能；另外，对Cu2O纳米颗粒影响光催化活性的机理进行了讨论.