TiO_2基可见光响应型光催化材料的研究进展

Advances in TiO_2-based Visible-light-response Photocatalytic Materials

开发合成可见光响应型光催化材料,是实现太阳能的高效利用的关键,对解决能源短缺和环境污染问题具有重要意义。TiO_2是一种最具代表性的光催化材料。而TiO_2禁带宽度较高导致其光吸收主要发生在紫外区,太阳能利用率低。为改善其光吸收特性,常采用非金属掺杂、金属掺杂及半导体复合对TiO_2进行改性。研究表明,对TiO_2进行杂原子掺杂及半导体复合,能够有效窄化带隙能,拓展吸收边界,促进可见光响应性,提高光催化性能。并展望了TiO_2基可见光响应型光催化材料的未来发展方向。

It is the key to the efficient use of solar energy and is of great significance for solving energy shortages and environmental pollution problems by preparing visible-light-responsive photocatalytic materials.TiO2 is one of the most representative photocatalytic materials.The absorption of light in the ultraviolet region and solar energy utilization is limited due to its higher band gap energy.Non-metal and metal doping and combining TiO2 with semiconductors are used to modify TiO2 to improve light absorption characteristics.It is found that heteroatoms doping and combining TiO2 with semiconductors can effectively narrow the band gap,expand the absorption boundary,promote the visible light response,and improve the photocatalytic performance.The developmental direction of TiO2-based visible-light-responsive photocatalytic materials in the future is also pointed.