RuO2／TiO2纳米管薄膜的制备及其光电催化性能研究

Preparation and Photoelectrocatalytic Properties of RuO_2/TiO_2 Nanotube Arrays Thin Films

采用阳极氧化法结合浸渍法在钛金属片基底上制备了TiO2负载RuO2纳米管阵列,利用场发射扫描电子显微镜(FE-SEM)、X射线衍射仪(XRD)、能谱仪(EDS)和紫外可见分光光度计对纳米管的形貌、结构和光学性能进行了表征,并研究了RuO2/TiO2纳米管阵列在紫外光和可见光下对亚甲基蓝溶液的光电催化性能。结果表明:RuO2/TiO2纳米管仍保持了纯TiO2纳米管的结构特征,部分Ru进入TiO2晶格代替了Ti的位置形成了固溶体,部分Ru以RuO2纳米粒子形式存在;RuO2/TiO2纳米管的光吸收波长发生了红移,且在整个可见光区均比纯TiO2纳米管光吸收能力强,RuO2/TiO2纳米管光电催化降解亚甲基蓝的4 h降解率由纯TiO2纳米管的27%提高到79%;采用该法制备的TiO2纳米管阵列膜回收简单,反复使用20次后光电催化降解能力基本保持不变。

RuO2 loaded TiOz nanotube arrays were fabricated by anodic oxidation method combined with impregnation on pure titanium substrate sheet. The morphology, structure and optical properties of the nanotubes were characterized by Field emission scanning electron microscope （FE-SEM）, X-ray diffraction （XRD）, energy disperse spectroscopy （EDS） and UV-Vis spectrophotometer. The photoelectric catalytic properties of RuO2/TiO2 nanotube arrays against methylene blue solution were investigated in the ultraviolet and visible light. The results showed that RuOE/TiO2 nanotubes remain the structural characteristics of the pure TiO2 nanotubes. Some of Ru ions were incorporated into the TiO2 lattice to form a solid solution by substituting Ti, while others were existed as Ru02 nanoparticles. The absorption light wavelength redshift was observed for RuO2/TiO2 nanotubes, and their optical absorption ability was enhanced in the entire visible region as compared to pure TiO2 nanotubes. The 4 h photoelectrocatalysis degradation rate against methylene blue increased from 27% for pure TiO2 nanotubes to 79% for RuO2/TiO2 ones. The recycling process for the prepared nanotubes array film in this work is simple, and their photoelectrocatalysis degradation ability is basically unchanged after using 20 times.