金属离子掺杂对TiO2光催化性能的影响

TiO₂光催化反应过程涉及光生电荷、电荷迁移、电荷在TiO₂表面的反应和溶液体相反应4个顺序相接并相互影响的步骤.在TiO₂中掺杂金属离子对以上4个步骤均有重要影响,合理的掺杂可有效地提高其光催化性能.本文综合了国内外此方面的最新研究成果,从提高TiO₂光催化性能和优化光催化反应的角度出发,在材料吸光能力、电荷扩散、表面反应、粒径和晶型等方面,全面地分析总结了金属离子掺杂的影响效果和规律性认识,并对TiO₂基光催化材料的金属离子掺杂改性研究的未来发展方向提出了建议.文中还简要介绍了相关的掺杂方法和材料表征手段.

Effects of Metal Ion Dopants on TiO2 Photocatalysis

The processs of TiO 2 photocatalytic reaction can be divided into four interactional steps in order of generation of charges by illumination,migration of the charges,reaction of the charges with the adsorbed species on the surface of TiO 2 and the reaction in the solution. All of the four steps are intensively influenced by metal ion dopants in TiO 2. Proper doping of metal ions leads to enhancement of TiO 2 photocatalytic activity. The state of art advances in this research area are summarized, and a general analysis and induction on the effects of doped metal ions in TiO 2 on its photocatalytic characteristics, which include absorption of light, migration of illuminated charges, reactions on the surface of TiO 2, particle sizes of TiO 2 and crystalline transformation in terms of improvement of TiO 2 photocatalytic properties and optimization of its photocatalysis are given. Based on this general survey, future research emphasis is suggested. And doping methods and characterization of TiO 2 photocatalyst are also outlined.