非金属掺杂的第二代二氧化钛光催化剂研究进展

寻求廉价、环境友好并具有可见光光催化活性的第二代光催化剂将是光催化发展进一步走向实用化的关键。氮掺杂的TIO2是新发现的具有可见光光催化活性的复合光催化剂,非金属掺杂可以使复合物的复合禁带宽度小于TIO2的禁带宽度,从而使TIO2的吸收边向可见光移动。对TIO2的氮、碳、硫、卤素掺杂国内外研究现状进行了系统评述,分析了提高TIO2可见光活性的原因,指出非金属元素特别是氮元素的阴离子掺杂是在不降低紫外光催化活性的基础上实现可见光响应的较好方法。

Research advances in the second generation of visible-light photocatalysts of nonmetal-doped TiO2

The development of low-cost,environment-friendly second generation of photocatalyst with a high activity under visible light irradiation is a vital trend for the further practicability of photocatalysis.Titanium dioxide doped with nitrogen is a novel second generation of photocatalyst with visible light photocatalytic activity,the width of forbidden band of composite photocatalysts doped with nonmetal is less than that of TiO_2,which makes the absorption of TiO_2 move toward visible light.The research progress in visible-light photocatalysis of titanium dioxide doped with nitrogen,carbon,sulfur and halogen was reviewed,and the factors improving the visible light photocatalytic activity are analyzed.The anion doping using nonmetal,especially nitrogen,is thought as a promising method to realize the response of TiO_2 to visible light on the basis of maintaining violet light photocatalytic activity.