Abstract:
The present research situation of photocatalysis technology and the mechanism of photocatalytic reaction of TiO2 thin film are discussed. The main factors that affect the photocatalytic activity of nano-TiO2 thin film are discussed in detail. The thickness and coating times of TiO2 thin film are regarded as having better linear relationship. The bigger the specific surface area of TiO2 thin film is，the smaller the hole and volume are，and the more uniform aperture distribution is，the higher photocatalytic activity of TiO2 is. Coupling of semiconductors can improve the separating results of charges of the system and expand the absorption spectrum of TiO2. Depositing of noble metals can promote the separating efficiency of current carriers on the surface of TiO2 thin film, which is beneficial to form more HO·. Metal ions doped enter into the crystal lattices of TiO2 can cause the defect of crystal lattices of TiO2, which restrains e- and h+ to combine，extends the life-span of current carriers，and thus，improves the photocatalytic activity of TiO2 .
Key words:
photocatalysis,
thin film,
modification,
titanium dioxide
摘要：
讨论了TiO2薄膜光催化技术的研究现状,探讨了光催化反应机理,详细讨论了影响TiO2薄膜光催化活性的主要因素,认为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;半导体耦合可提高系统的电荷分离效果,扩展对光谱吸收范围;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HO.;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。
关键词:
光催化,
薄膜,
改性,
二氧化钛
CLC Number:
Cui Yumin, Zhang Wenbao, Miao Hui, Wang Hongtao. New progress in the research on the modification of TiO2 thin film[J]. INDUSTRIAL WATER TREATMENT, 2011, 31(4): 1-4.
崔玉民, 张文保, 苗慧, 王洪涛. TiO2薄膜改性研究新进展[J]. 工业水处理, 2011, 31(4): 1-4.