TiO_2基固体超强酸及其在光催化空气净化中的应用

TiO_2-based Solid Superacid and Its Application for Photocatalytic Air Purification

介绍了光催化空气净化催化剂的制备、性能、结构等。总结了国内外关于固体超强酸光催化剂的研究 ,论述了SO2 -4/TiO2 超强酸光催化剂的研究结果 ,包括其制备。

SO 2- 4/TiO 2,a surperacidic solid, was prepared by impregnation of dried TiO 2 gel in dilute sulfuric acid followed by drying and calcination. The dried gel was prepared by using sol-gel method and tetrabutyl titanate [Ti(OC 4H 9) 4] as Ti precursor. The SO 2- 4/TiO 2 showed an excellent photocatalytic behavior for decomposition of organic and inorganic compounds. Effect of the surperacidification on the structure and properties of TiO 2 was characterized by XRD, FTIR, XPS, DRS, surface photovoltage spectrum and N 2 adsorption, etc. It has been showed that SO 2- 4 could restrain transformation of TiO 2 from anatase to rutile phase, decreasing specific surface area and enhancing growth of crystal TiO 2 which occurred in calcination process. From the studies, we proposed a surface photocatalytic model of solid superacid which well explained reason of enhancing photocatalytic activity of the surperacidification. In this paper, we report the main research results on the solid superacids in our lab, including the above-mentioned fundamental studies and practical application of the catalyst for photocatalytic purification of air.