摘要
以钛酸丁酯和硅酸乙酯为主要原料,制备多孔纳米TiO_2-SiO_2复合材料,采用氮气吸附-脱附,XRD,TEM,FT-IR等测试方法对其进行表征,以甲基橙的光催化降解反应对其光催化活性进行评价。结果表明,TiO_2-SiO_2具有核-壳结构,为锐钛矿和金红石相的混合物,比表面达到118.62m^2/g,TiO_2以粒径为12.4 nm的晶粒形式被SiO_2包覆,复合材料粒径约为18 nm；复合材料在22 min时对甲基橙降解率达100%,而纯TiO_2在22 min时,对甲基橙降解率仅为40%,说明复合材料光催化活性比纯TiO_2有明显提高。
Porous nanometer TiO2 - SiO2 composite material was prepared from Ti（OC4H9）4 and Si（C2H5）4 as major raw material using sol - gel technique and characterized by adsorption/desorption of N2, XRD, TEM and FTIR. Its photo - catalytic activity for the decomposition of methyl orange was also evaluated. The test results indicated that the TiO2 - SiO2 was of nucleus - shell structure comprising the mixture of anatase and rutile phase with the specific surface area of 118.62 m2/g. TiO2 particles of 12.4 nm in diameter were coated with porous SiO2 film and the size of composite material was about 18 nm. The methyl orange could be decomposed at 100% and 40% when using composite material and pure TiO2 as catalyst respectively in 22 min showing that photo - catalytic activity of the composite material was higher than pure TiO2.
出处
《精细石油化工进展》
CAS
2005年第7期4-7,共4页
Advances in Fine Petrochemicals
基金
国防科工委"十五"规划"武器装备预先研究公用技术项目"(41305070203)。
