Zhang Xi, Liao Lei, Ling Yun-Han, Qin Ai-Miao, Zhao Cheng-Gen, Zhao Fei-Chao
Guangxi Key Laboratory of Environmental Engineering and Protecting Assessment,Guilin University of Technology, Guilin 541004, China.
Huan Jing Ke Xue. 2011 Nov;32(11):3372-8.
Well-aligned and uniform titanium dioxide nanotube arrays were fabricated in situ on titanium substrate by electrochemical anodic oxidation. SEM images indicate that the TiO2 nanotubes are well organized into high-density uniform arrays,with diameter ranging in size from 70 to 100 nm. The XRD patterns show that the sample fabricated by anodic oxidation is amorphous without being annealed. As the 500 degrees C annealed sample crystallized in the anatase phase, which is in good photocatalytic activity. In quartz glass reactor, the photoelectrocatalytic degradation of MB in aqueous solutions as well as the effect factors and then to 0.1 mol/L NaCl as the electrolyte, under with in oxygen atmospheres annealed the applied bias is 0.5 V and has a pH = 3.25, light intensity is 1 000 microW/cm2 and the surface area of nano-tube array film conditions, will help to improve the TiO2 nanotubes array film photoelectrocatalysis degradation of MB degradation efficiency is 99.56%. The results of EIS analyses revealed that the surface reaction step was the only rate limiting step either for the photoelectrocatalytic process. The extra bias potential could decrease the values of the electron-transfer resistance and increase the separation efficiency of photogenerated electron-hole pairs.
通过电化学阳极氧化法在钛基底上原位制备了排列良好且均匀的二氧化钛纳米管阵列。扫描电子显微镜（SEM）图像表明，TiO₂纳米管排列整齐，形成了高密度均匀阵列，直径范围为70至100纳米。X射线衍射（XRD）图谱显示，阳极氧化制备的样品未经退火处理时为非晶态。当在500℃退火后，样品结晶为锐钛矿相，具有良好的光催化活性。在石英玻璃反应器中，以0.1 mol/L NaCl为电解质，在氧气气氛中退火，施加偏压为0.5 V，pH = 3.25，光强为1000 μW/cm²以及纳米管阵列膜表面积的条件下，对水溶液中的亚甲基蓝（MB）进行光电催化降解以及考察影响因素，结果表明这有助于提高TiO₂纳米管阵列膜对MB的光电催化降解效率，降解率为99.56%。电化学阻抗谱（EIS）分析结果表明，表面反应步骤是光电催化过程的唯一速率限制步骤。额外的偏压电位可以降低电子转移电阻值，提高光生电子-空穴对的分离效率。
