重庆理工大学学报（自然科学版）2011，Vol.25Issue(3)：51-57,7.
多级孔结构TiO2微球光催化剂的制备及其性能研究
The Preparation and Performance of TiO2 Microsphere Photocatalysts with Multilevel Hole Structure
摘要
Abstract
Nanometer TiO2 is a promising photo-catalyst with excellent physical and chemical property. However, when used in wastewater treatment, nanometer TiO2 is very difficult for its separation and recovery from liquid phase, causing a higher operation cost. Preparing TiO2 microsphere photo-catalysts with high activity provide a very good solution for this problem. TiO2 microspheres with multilevel hole structure were prepared using a new preparation process, which includes four steps, i.e. controllable hydrolysis and condensation of titanium tetrabutyrate (TTB) in the presence of a surfactant, sonochemical condensation of TiO2 precursor in water, hydrothermal crystallization of the precursor and finally calcination of hydrothermally treated powder. The optimum preparation conditions are as follows, the water concentration in ethanol 10％ (V/V), the molar ratios of n ( H20)/n ( Ti ) and n( Ti)/n(P123) are around 5 and 46, respectively, ultrasonication time 90 min and calcination temperature 400 ℃. The characterization of samples using field emission scanning electronic microscope, N2 adsorption and X-ray diffractometer indicated that the samples have a hierarchic, biomimetic structure on the surface of the TiO2 microspheres, the BET specific surface area of the microspheres reached 185 m2/g, and the ratio of anatase to rutile phase is about 7: 3. The practical photocatalytic efficiency of the prepared sample is more than 3.5 times that of the commercial photocatalyst P25, showing it has a good potentiality in industrial use.关键词
光催化剂/TiO2微球/多级孔结构/光催化降解Key words
photo-catalyst/ TiO2 microsphere/ photocatalytic degradation/ multilevel hole structure分类
化学化工引用本文复制引用
张莉,谭林燕,冯竹,朱强,赵国良,全学军..多级孔结构TiO2微球光催化剂的制备及其性能研究[J].重庆理工大学学报（自然科学版）,2011,25(3):51-57,7.基金项目
重庆市大学生创新实验计划资助项目(CS200927) （CS200927）
