Liang Hai-Chao, Li Xiang-Zhong
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China.
J Hazard Mater. 2009 Mar 15;162(2-3):1415-22. doi: 10.1016/j.jhazmat.2008.06.033. Epub 2008 Jun 19.
In this study titanium dioxide nanotube (TNT) arrays were prepared by an anodic oxidation process with post-calcination. The morphology and structure of the TNT films were studied by field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Photocatalytic activity of the TNT films was evaluated in terms of the degradation of 2,3-dichlorophenol in aqueous solution under UV light irradiation. The effects of the nanotube structure including tube length and tube wall thickness, and crystallinity on the photocatalytic activity were investigated in detail. The results showed that the large specific surface area, high pore volume, thin tube wall, and optimal tube length would be important factors to achieve the good performance of TNT films. Moreover, the TNT films calcined at 500 degrees C for 1h with the higher degree of crystallinity exhibited the higher photocatalytic activity than other TNT films calcined at 300 and 800 degrees C. Consequently, these results indicate that the optimization of TiO(2) nanotube structures is critical to achieve the high performance of photocatalytic reaction.
在本研究中，通过阳极氧化工艺并进行后续煅烧制备了二氧化钛纳米管（TNT）阵列。采用场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对TNT薄膜的形貌和结构进行了研究。通过在紫外光照射下对水溶液中2,3 - 二氯苯酚的降解来评估TNT薄膜的光催化活性。详细研究了纳米管结构（包括管长和管壁厚度）以及结晶度对光催化活性的影响。结果表明，大比表面积、高孔容、薄壁管以及最佳管长是实现TNT薄膜良好性能的重要因素。此外，在500℃煅烧1小时且结晶度较高的TNT薄膜比在300℃和800℃煅烧的其他TNT薄膜表现出更高的光催化活性。因此，这些结果表明优化TiO₂纳米管结构对于实现光催化反应的高性能至关重要。
