TiO_2-SiO_2纳米多孔材料常压干燥制备  

Preparation of TiO_2-SiO_2 Nano-porous Materials by Ambient Pressure Drying

作　　者：冷小威[1] 刘敬肖[1] 史非[1] 王振宇[1] 李雨珖[1] 董晓丽[1] 魏莉[1] 

机构地区：[1]大连工业大学化工与材料学院,大连116034

出　　处：《材料导报》2010年第8期89-93,共5页Materials Reports

基　　金：大连市科技计划项目(2007J23JH014)

摘　　要：以廉价的TiCl4和工业水玻璃为原料,通过溶胶-凝胶法制得了TiO2-SiO2复合湿凝胶,用三甲基氯硅烷(TMCS)/乙醇(EtOH)/己烷(Hexane)溶液对湿凝胶进行改性,再经常压干燥制备了TiO2-SiO2纳米多孔材料。利用扫描电子显微镜(SEM)、红外吸收光谱(FTIR)和N2吸附/解吸法对纳米多孔材料的形貌和性质进行了分析。结果表明,所制备的TiO2-SiO2纳米多孔材料为轻质块状固体,具有连续多孔结构,密度为0.14～0.25g/cm3,孔隙率为88.6%～93.6%,比表面积为716.8～802.7m2/g。吸附和光催化降解罗丹明B的结果表明,n(Ti)∶n(Si)=1∶3的样品吸附率最高,20h时达到86%,n(Ti)∶n(Si)=1∶2的样品光催化降解率最高,10h时可达到94%。Using cheap TIC14 and waterglass as raw materials, TiO2-SiO2 nano-porous materials are prepared by a new ambient pressure drying process, using trimethylchlorosilane（TMCS）/ethanol （EtOH）/hexane solution to modify the sol-gel-derived TiO2-SiO2 wet gel. The morphology and properties of the nano-porous materials are ana- lyzed by scanning electron microscope（SEM）, fourier transform infrared spectroscope（FTIR） and Nz adsorption-de- sorption measurement. The results indicate that the obtained TiO2-SiO2 nano-porous materials exhibit a porous struc- ture, with a density of 0. 14-0. 25g/cm3, porosity of 85. 8%-93.6% and specific surface area of 716. 8-802. 7m2/ g. The results of adsorption and photocatalytic degradation of rhodamine B indicate that TiO2-SiO2 nano-porous mate- rials with Ti/Si molar ratio of 1 ： 3 have the highest adsorption ratio which achieves 86% at 20h, and that with Ti/Si molar ratio of 1 ： 2 have the optimal photocatalytic degradation activity which achieves 94% at 10h.

关 键 词：TIO2-SIO2 常压干燥 纳米多孔材料 吸附光催化 

分 类 号：TB383[一般工业技术—材料科学与工程]