TiO_2-SiO_2复合气凝胶:常压干燥制备及性能表征  

TiO_2-SiO_2 Composite Aerogel:Preparation by Ambient Pressure Drying Process and Characterization

作　　者：冷小威[1] 刘敬肖[1] 史非[1] 殷澍[2] 佐藤次雄[2] 

机构地区：[1]大连工业大学化工与材料学院,大连116034 [2]日本东北大学多元物质研究所

出　　处：《无机化学学报》2009年第10期1791-1796,共6页Chinese Journal of Inorganic Chemistry

基　　金：大连市科技计划项目(No.2007J23JH014)资助

摘　　要：以廉价的四氯化钛和工业水玻璃为原料,通过溶胶-凝胶法制得TiO2-SiO2复合湿凝胶,用三甲基氯硅烷(TMCS)/乙醇(EtOH)/正己烷(Hexane)混合溶液对湿凝胶进行改性,常压干燥制备了TiO2-SiO2复合气凝胶。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、红外光谱(FTIR)、X射线衍射(XRD)及N2吸附/脱附法对复合气凝胶的形貌和性质进行了分析。结果表明,TiO2-SiO2复合气凝胶具有连续多孔结构,150℃干燥后复合气凝胶的比表面积为1 076 m2.g-1,孔体积为4.96 cm3.g-1;经550℃热处理后,复合气凝胶仍然具有高的孔隙率,比表面积为856 m2.g-1,孔体积为3.46 cm3.g-1。吸附和光催化降解罗丹明B的结果表明,复合气凝胶同时具有较好的吸附和光催化性能,其吸附/光催化协同作用活性优于纯SiO2气凝胶和锐钛矿TiO2粉末;且重复利用四次降解率仍然可达到89%。Using cheap titanium tetrachloride and industrial waterglass as raw materials, TiO2-SiO2 composite aerogels were prepared via an ambient pressure drying process, by using Trimethylchlorosilane/Ethanol/Hexane solution to modify the sol-gel-derived TiO2-SiO2 wet gel. The morphology and properties of the aerogels were characterized by SEM, TEM, FTIR, XRD and N2 adsorption-desorption measurement. The results indicate that the obtained TiO2-SiO2 composite aerogels exhibit a porous structure, with a specific surface area of 1 076 m^2· g^-1 and pore volume of 4.96 cm^3 ·g^-1 after dried at 150 ℃. Moreover, the composite aerogels still show high porosity after calcined at 550 ℃, with a specific surface area of 856 m^2·g^-1 and pore volume of 3.46 cm^3 ·g^-1. The results of adsorption and photocatalytic degradation of rhodamine B show that TiO2-SiO2 composite aerogels have both good adsorption and photocatalytic properties. The synergistic adsorption/photocatalysis activity of TiO2-SiO2 composite aerogels was better than pure SiO2 aerogels and pure anatase TiO2 powder. Additionally, the adsorption/ photocatalytic degradation rate is still up to 89% after being used for four times.

关 键 词：TIO2-SIO2 气凝胶 常压干燥 吸附 光催化 

分 类 号：O613.72[理学—无机化学] O614.417[理学—化学]