离子掺杂对纳米TiO₂薄膜光催化性能的影响

来源期刊：中国有色金属学报2006年第5期

论文作者：许珂敬 杨新春 李正民

文章页码：847 - 852

关键词：TiO₂薄膜； 光催化活性; 离子掺杂; 电子-空穴对; 烧结温度

Key words：TiO₂ coating film; photocatalytic activity; ions doping; electron-cave pairs; sintering temperature

摘    要：采用溶胶-凝胶法制备含有不同掺杂离子的TiO₂溶胶和纳米粉， 采用浸渍提拉法将溶胶涂敷在自制的多孔陶瓷膜件上， 考察其对蚁酸溶液(1%)的光降解作用。 研究结果表明， 在适宜掺杂浓度(1%Fe³⁺, 0.5%La³⁺(摩尔浓度))下，Fe³⁺/La³⁺-TiO₂膜的光催化性能最好。 采用X射线衍射仪分析、原子力电子显微镜和吸收光谱仪等研究单独掺杂Fe³⁺、 La³⁺和复合掺杂Fe³⁺/La³⁺离子的作用及膜的性能， 从而确定出提高TiO₂光催化活性的最佳掺杂工艺。

Abstract: The TiO₂ sol and nano-powders with different dopants were prepared by sol-gel method. The nano-film was coated on the self-made porous ceramic by dipping-lift process. The photodegradation of formic acid solution(1%) on TiO₂ film with different dopants was studied. The results show that the Fe³⁺/La³⁺-TiO₂ film with the appropriate doping concentration (1%Fe³⁺, 0.5%La³⁺ (mole fraction)) has better photocatalytic activity. The roles and mechanism of doping Fe³⁺, La³⁺ and co-doping Fe³⁺/La³⁺ ions were studied by XRD and absorption spectra. And the appropriate doping procedure for increasing TiO₂ photocatalytic activity was determined.

基金信息：国家高技术研究发展计划资助项目