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介绍了纳米TiO2光催化技术的研究进展,分析了纳米TiO2的光催化机理,详细论述了影响TiO2光催化活性的主要因素。研究发现,晶粒尺寸越小光催化活性越高;贵金属沉积可提高催化剂表面光生载流子的分离效率,能抑制电子与空穴的复合;半导体耦合有利于电荷分离,扩展对光谱吸收范围;掺杂金属可引起TiO2晶格发生位置缺陷,从而抑制电子与空穴的复合,改善光催化性能;掺杂非金属在抑制晶型转变、改变样品的光吸收率以及抑制光生载流子复合等方面具有显著影响,能提高纳米TiO2的光催化效率。
Abstract：The reseach development of TiO2 photocatalysis technology was presented, and the mechanism of photocatalytic activity of nano-TiO2 was analyzed. Primary factors affecting the photocatalytic activity of nano-TiO2 were discussed. The smaller crystal grains are, the more effectively they can improve the photocatalytic activity of TiO2. Deposition of noble metals can promote separating efficiency of surface photo-induced current carriers and depress the electron-hole recombination. Coupling of semiconductors is benificial to charge separation and expand the light absorption spectrum of TiO2. Doped metal ions can produce lattice defects in TiO2 by entering into the crystal lattices, thus the photocatalytic property of TiO2 is improved by decreasing the elentron-hole recombination. On the other side, doped nonmetal ions can restrain the conversion of crystal types, improve the light absorption efficiency of the sample, and decrease the recombination of photon-generated carriers, thus the photocatalytic efficiency of nano-TiO2 is increased obviously.
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基本信息:
中图分类号:O643.3
引用信息:
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2008-01-15
2008-01-15