| 低温下溶胶凝胶法制备TiO2纳米晶(英文) | |
| Preparation of Nanocrystalline TiO2 by Sol-Gel-Method at Room Temperature | |
| 摘要: 从含过量水的溶胶出发，在室温下得到了TiO2纳米晶。通过红外光谱，透射电子显微镜法和X射线粉末衍射法对含有过量水的溶胶体系中TiO2纳米晶的室温形成机理进行了研究。与传统的溶胶凝胶法相比，在改良的溶胶凝胶体系中，在缩聚反应之前由于水过量使得钛的先驱体快速且充分的水解，从而生成[TiO6]基团，随之形成TiO2纳米晶。晶粒的尺寸为约3.5 nm，该法得到的TiO2纳米晶比传统溶胶凝胶法得到的TiO2纳米晶和商用光催化剂德固赛P25具有更好的光催化活性。 | |
| 关键词: TiO2纳米晶 改良的溶胶凝胶体系 机理 光催化活性 | |
| 基金项目: | |
| Abstract: Nanocrystalline titania(TiO2) particles were obtained at room temperature by a modified sol-gel method starting from a solution with large amount of water. The nanocrystalline TiO2 particles prepared with large amount of water at room temperature were characterized by IR, TEM and XRD. Comparing with conventional sol-gel method, the present system offers quick and complete hydrolysis of titanium precursor before polycondensation，thus resulting in [TiO6] units, and the formation of nanocrystalline TiO2 particles with an average grain size of 3.5 nm. Moreover, the as-prepared nanocrystalline TiO2 powders exhibit a better photocatalytic activity than both of the powders prepared by conventional sol-gel method and the commercial photocatalyst Degussa P25. | |
| Keywords: nanocrystalline TiO2 modified sol-gel method mechanism photocatalytic activity | |
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| 陈志君,赵高凌,李 红,张俊娟,宋 斌,韩高荣.低温下溶胶凝胶法制备TiO2纳米晶(英文)[J].无机化学学报,2010,26(5):860-866. | |
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