参考资料--掺铈二氧化钛纳米管的制备与光催化活性研究最终版.docVIP

掺铈二氧化钛纳米管的制备及其光催化活性研究 采用水热法制备钛纳米管，水热条件为130℃24h；再利用法制备掺铈TiO2纳米管。通过热分析仪、透射电镜仪、扫描电子显微镜和X射线衍射仪等对其进行表征；并以农药草甘膦作为降解物，研究TiO2纳米管和掺铈TiO2纳米管的光催化性能。结果表明，掺杂适量稀土元素铈提高了TiO2纳米管对草甘膦的降解率TiO2纳米管光催化性能并且铈掺杂量和煅烧温度存在一个最佳值，当铈掺杂为0.15 %，煅烧温度为400℃时，TiO2纳米管的光催化性能最好，125W汞灯照射1h后，对草甘膦的降解率达到75%。铈掺杂；TiO2纳米管；草甘膦；光催化O 643.32 文献标识码：A Study on Preparation and Photocatalytic Activity of Titania Nanotubes Doped with Cerium XUE Wei-liang, ZHANG Guo-wen, XU Xiong-fa, XU Yue-hua (Institute of Biomaterial, College of Science, South China Agricultural University, Guangzhou 510642, China) Abstract: Titanic acid nanotubes were synthesized by hydrothermal treatment of rutile-phase TiO2 nanoparticles in l0 mol?L?1 NaOH solution at 130℃ for 24 h. Cerium doped titania nanotubes (Ce-TiO2 nanotubes) were obtained by impregnation method, and characterized by differential thermal analysis-thermogravimetry analysis (DTA-TG), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), flourier transfer infrared spectroscopy (FI-IR), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The photocatalytic activity of Ce-TiO2 nanotubes were investigated by the degradation of glyphosate. The results show that appropriate cerium-doped content can effectively enhance the photocatalytic activity of TiO2 nanotubes. The photocatalytic activity of Ce-TiO2 nanotubes was best, when the cerium-doped content was 0.15 % and the heat treatment temperature was 400℃. The degradation rate of glyphosate was about 75 % after 1h under the irradiation of the 125W high-pressure mercury lamp. Key words: cerium-doped; titania nanotubes; glyphosate; photocatalytic 目前已证实，纳米二氧化钛光催化在废水处理、空气净化、等领域里具有潜在的或现实的应用价值[1]，因此纳米TiO2光催化性能的研究及其实用性开发已成为当前各国研究者密切关注的热点。因为禁带宽约3.2 eV的TiO2激发产生电子-空穴对需用（近）紫外光照射，其电荷载流子复合速率很快，一般发生在皮秒和纳秒的时间尺度范围内，光催化活性对可见光的利用率 []。 目前，提高纳米TiO2光催化性能主要采用过渡金属掺杂、稀土元素掺杂、贵金属沉积、复合半导体、有机染料光敏化等方法。研究报道最多的是掺杂改性TiO2[]，其中有不少是关于掺杂稀土元素改性TiO2纳米粉的报道[]。TiO2纳米管是TiO2的一种存在形式，由于纳米管比纳米粉体和纳米膜具有更大的比表面，因而具有较高的吸附能力，可望提高TiO2光电转换效