[二氧化钛光催化剂的光谱研究]

[Spectrum studies on titania photocatalysts].

作者信息

Su W, Fu X, Wei K, Zhang H, Lin H, Wang X, Li D

机构信息

Research Institute of Photocatalysis, Fuzhou University, 350002 Fuzhou.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2001 Feb;21(1):32-4.

PMID:12953571

Abstract

The nano-sized TiO2 photocatalysts were prepared by sol-gel method and characterized by FTIR spectroscopy, FT-Raman spectroscopy and diffuse reflectance spectroscopy(DRS). Photocatalytic degradation of oleic acid over the TiO2 catalysts was investigated. The result showed that calcination temperature has strong effect on crystal structure, energy band structure, optical adsorption and photocatalytic activity of the TiO2 catalysts. It was found that the TiO2 photocatalyst calcined at 400 degrees C has the best apparent optical adsorption, the biggest band edge position and the highest photoactivity. The effect of calcination temperature on photocatalytic activity of TiO2 catalysts has been ascribed to the changes in structure and optical property of catalyst such as crystal size, content of rutile, residual NO3-, and band-edge position of light adsorption.

摘要

采用溶胶-凝胶法制备了纳米TiO₂光催化剂，并通过傅里叶变换红外光谱（FTIR）、傅里叶变换拉曼光谱和漫反射光谱（DRS）对其进行了表征。研究了TiO₂催化剂对油酸的光催化降解性能。结果表明，煅烧温度对TiO₂催化剂的晶体结构、能带结构、光吸收性能和光催化活性有显著影响。发现400℃煅烧的TiO₂光催化剂具有最佳的表观光吸收性能、最大的能带边缘位置和最高的光催化活性。煅烧温度对TiO₂催化剂光催化活性的影响归因于催化剂结构和光学性质的变化，如晶体尺寸、金红石含量、残留NO₃⁻以及光吸收的能带边缘位置。