钴掺杂TiO2纳米管阵列薄膜的制备及其光催化还原性能

用磁控溅射法在ITO玻璃基底上制备Ti-Co合金薄膜，对其阳极氧化处理制备出钴掺杂TiO₂纳米管阵列薄膜，研究了钴掺杂对纳米管阵列薄膜的形貌、结构、吸收光谱以及光催化还原性能的影响。结果表明：钴掺杂TiO₂纳米管阵列薄膜为锐钛矿相，管状阵列的管径均一、排列规整。钴掺杂使薄膜形成(001)择优取向。随着钴掺杂量的提高，薄膜吸收可见光的能力提高。钴含量(原子分数)为0.19%的薄膜光催化性能最优，可见光照150 min后对Cr(VI)的还原率可达98.4%。

Fabrication of Films of Co Doped TiO2 Nanotube Array and their Photocatalytic Reduction Performance

Films of Ti-Co alloy were firstly prepared on ITO glass by magnetron sputtering and then were anodized in electrolyte of ethylene glycol + DI water + NH₄F to produce films of the Co-doped TiO₂ nanotube arrays. The effect of Co doping on the morphology, microstructure, optical and photocatalytic reduction performance under visible light was assessed for the acquired films. The results show that the films of Co-doped TiO₂ nanotube arrays are composed of anatase, the same as the plain TiO₂, while the preferred orientation changed to (001) from (101) of the plain TiO₂. The incorporation of Co improved the absorption of visible light and promoted the separation of photo-generated electro-hole pairs simultaneously. Compared to the film of plain TiO₂, the ones of Co-doped TiO₂ nanotube arrays exhibit better photocatalytic reduction performance. The film with 0.19%Co (atomic fraction) shows the best photocatalytic reduction efficiency, it is 98.4% after visible light irradiation for 150 min.