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Morphological Structure and Photocatalytic Activities of SnO2-TiO2 Composite Particles
Shi Liyi1, Li Chunzhong2, Gu Hongchen2, Fang Dingye3
1.Department of Chemistry,School of Science,Shanghai University,Shanghai 20007 Institute of Technical Chemistry and Physics, Technology,Shanghai 200237;2.Institute of Technical Chemistry and Physics, Technology,Shanghai 200237;3.Department of Chemical Engineering,East China University of Science and Technology,Shanghai 200237
Abstract:
Ultrafine titania particles were prepared by gas-phase oxidation of titanium tetrachloride in a high temperature tubular gas-phase reactor.The homogeneous precipitation method was used to prepare SnO2-TiO2 composite particles.The composite particles were characterized by TEM,EDS,XRD and BET surface area.The synthesized composite particles,pure ultrafine TiO2,commercial TiO2,and pure SnO2 were employed for photocatalytic degradation of azo dye active red X-3B in aerated solution.The result showed that a rapid and decolorization of the azo dye was achieved,and the photoactivity of the composite particles was higher than that of the pure ultrafine TiO2 and commercial TiO2,and the optimum loading of SnO2 on TiO2 is 15.3%.The enhanced degradation rate of X-3B using SnO2-TiO2 composite particles was attributed to increased charge separation in these systems.
Key words:  Composite particles,Photocatalytic oxidation,Titania
FundProject:国家九五攻关项目(96-554-02)、国家自然科学基金项目(29636010)
SnO2-TiO2复合颗粒的形态结构及其光催化活性
施利毅1, 李春忠2, 古宏晨2, 房鼎业3
1.上海大学理学院化学系上海 200072 华东理工大学技术化学物理研究所 200237;2.华东理工大学技术化学物理研究所 200237;3.华东理工大学技术化学化工系上海 200237
摘要:
在气溶胶反应器中,利用TiCl4高温氧化反应制备超细TiO2,采用均匀沉淀法在TiO2表面沉积SnO2,制备SnO2-TiO2复合颗粒,应用TEM、EDS、XRD、BET比表面积测试等手段对粒子进行表征。以活性艳红X-3B溶液为处理对象,考察复合颗粒的光催化活性。结果表明SnO2-TiO2复合颗粒的光催化活性较纯气相合成超细TiO2有较大提高,SnO2最佳含量为15.3%,SnO2-TiO2复合颗粒光催化活性的提高归因于不同能级半导体之间光生载流子的输运和分离。
关键词:  复合颗粒  光催化氧化  二氧化钛
DOI:10.1088/1674-0068/13/3/336-341
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