摘要
本文讨论了影响TiO2薄膜光催化活性的主要因素:(1)TiO2薄膜的厚度与镀膜次数有较好的线性关系;TiO2薄膜的比表面积越大,孔隙、孔体积越小,孔径分布越均匀,其催化活性越高;(2)贵金属沉积可提高TiO2薄膜光催化剂表面光生载流子的分离效率,有利于生成更多的·OH;(3)金属离子掺入TiO2薄膜晶格中可能引起晶格位置缺陷或改变结晶度,抑制电子与空穴的复合,延长载流子的寿命,从而使光催化性能得以改善。
In this article, these primary factors influencing the photocatalytic activity of TiO2 thin films were discussed： （ 1 ）A better linear relation exists between the thickness of TiO2 thin film and coating cycles. The bigger the specific surface area of TiO2 thin film is, the smaller the hole and volume of hole are, and the more uniform aperture distribution is, the higher photoeatalytie activity of TiO2 is. （2）Depositing of noble metals can promote separating efficiency of current carriers on the surface of TiO2 thin film, which is beneficial to form more-OH. （3）Metal ions doped enter into the crystal lattices of TiO2 thin films to cause the defect of crystal lattices of TiO2, which restains e^- and h^＋ to combine, delays the life-span of current carriers, and improves the photoeatalytie activity of TiO2.
出处
《天津化工》
CAS
2008年第3期23-26,共4页
Tianjin Chemical Industry
基金
安徽省自然科学基金项目(050450301)
安徽省教育厅自然科学基金项目(2006KJ123B)
关键词
光催化活性
薄膜
二氧化钛
photoeatalytic activity
thin film
titanium dioxide
