常压干燥制备TiO_2-SiO_2复合气凝胶的结构与性能  

MICROSTRUCTURE AND PROPERTIES OF TiO_2-SiO_2 COMPOSITE AEROGELS PREPARED VIA THE AMBIENT PRESSURE DRYING

作　　者：刘敬肖[1] 冷小威[1] 史非[1] 董晓丽[1] 翟滨[1] 李雨珖[1] 

机构地区：[1]大连工业大学化工与材料学院,辽宁大连116034

出　　处：《硅酸盐学报》2010年第12期2296-2302,共7页Journal of The Chinese Ceramic Society

基　　金：大连市科技计划(2007J23JH014)资助项目

摘　　要：以TiCl4和工业水玻璃为原料,采用溶胶-凝胶法,用三甲基氯硅烷/乙醇/正己烷混合溶液处理改性湿凝胶,通过常压干燥制备高比表面积和孔体积的TiO2-SiO2复合气凝胶。用扫描电镜、透射电镜、X射线衍射和Brunauer-Emmett-Teller法分析表征样品的形貌、微观结构和气凝胶孔的性能,研究复合气凝胶对罗丹明B(RhodamineB,RhB)的光催化降解性能,探讨二氧化硅含量对TiO2-SiO2复合气凝胶结构性能的影响。结果表明:随着硅含量的增加,所得TiO2-SiO2复合气凝胶的最可几孔径逐渐减小,比表面积和光催化活性先增大后减小;当摩尔比n(Ti):n(Si)=4:1时,制备的气凝胶比表面积为893m2/g,对30mL浓度为10-4mol/LRhB溶液的最终光催化降解率达到99%,优于锐钛矿TiO2粉末的。With titanium tetrachloride and waterglass as raw materials,TiO2-SiO2 aerogels were prepared via an ambient pressure drying process,using a trimethylchlorosilane/ethanol/hexane solution to modify the sol-gel-derived TiO2-SiO2 wet gel.The morphology,microstructure and pore properties of the aerogels were studied by the scanning electron microscopy,transmission electron microscopy,X-ray diffraction,and Brunauer-Emmett-Teller analysis.Adsorption and photocatalytic degradation for Rhodamine B（Rh B） of TiO2-SiO2 aerogels were investigated,and effects of silica contents on microstructure and properties were also researched.The results indicate that with the increasing of the silica contents in TiO2-SiO2 aerogel,the pore diameter gradually decreases,and specific surface area and photocatalytic activity first increase and then decrease.When mole ratio n（Ti）：n（Si） = 4：1,the prepared TiO2-SiO2 aerogels have a specific surface area of 893 m2/g,and final photocatalytic degradation rate for 30 mL 10-4 mol/L Rh B solution can reach 99%,which is better than that of anatase TiO2 powder.

关 键 词：钛硅氧化物 复合气凝胶 常压干燥 吸附 光催化 

分 类 号：TB32[一般工业技术—材料科学与工程]