溶胶-乳化-凝胶法制备超分散性TiO_2纳米颗粒  

The Effecting Factors of Super-Dispersion TiO_2 Nanoparticles Prepared by Sol-Emulsion-Gel Method

作　　者：张世英[1,2] 余取民[1] 李云龙[1] 游洋[2] 王群[2] 陈振华[2] 

机构地区：[1]长沙学院生物工程与环境科学系,湖南长沙410003 [2]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《稀有金属材料与工程》2008年第A02期326-329,共4页Rare Metal Materials and Engineering

基　　金：湖南省自然科学基金项目(No:06JJ50150)

摘　　要：采用溶胶-乳化-凝胶法制备分散好的TiO2纳米颗粒,以pH和十六烷基三甲基溴化胺与蒸馏水的摩尔比(W)为实验参数,考察它们对TiO2纳米颗粒尺寸、分散性和光催化活性的影响,并通过使用TG-DTA、SEM、XRD及BET对其化学结构及晶化过程进行分析。同时利用甲基橙的光催化降解评价制备的TiO2纳米颗粒的光催化活性。结果表明:pH为8.5、十六烷基三甲基溴化胺与蒸馏水的摩尔比为1.08时,所得的TiO2纳米颗粒的比表面积为273m2/g,颗粒粒径为7nm,光催化活性最好。The TiO2 nanoparticles with good dispersion were prepared by sol-emulsion-gel method. How pH values and molar ratios of hexadecyl trimethyl ammonium bromide to distilled water affected sizes, dispersion and photoactivity of TiO2 nanoparticles as the experimental parameters was investigated. The physico-chemical change of TiO2 in heat-treatment processes was analyzed and TiO2 nanoparticles were characterized by thermal analysis, scanning electronic microscopy, X-ray diffraction and BET. The photocatalytic activity of TiO2 was evaluated by methyl orange （MO） photodegradation. The obtained TiO2 nanoparticles show high photoactivity with 273m2/g surface area and 7nm average diameter, when the molar ratios ofhexadecyl trimethyl ammonium bromide to distilled water is 1.08 with 8.5 pH value.

关 键 词：溶胶-乳化-凝胶法 TIO2纳米颗粒 前驱体 光催化剂 

分 类 号：TB383.1[一般工业技术—材料科学与工程]