Porous TiO2-coated Magnetic Core-Shell Nanocomposites：Preparation and Enhanced Photocatalytic Activity  

作　　者：刘鸿飞 季生福 郑园园 李明 杨浩 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing100029, China

出　　处：《Chinese Journal of Chemical Engineering》2013年第5期569-576,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China（21173018,20473009）

摘　　要：The core-shell structured TiO2/SiO2 @Fe3O4 photocatalysts were prepared using Fe3O4 as magnetic core,tetraethoxysilane（TEOS） as silica source and tetrabutyl titanate（TBOT） as titanium sources.The as-obtained structure was composed of a SiO2@Fe3O4 core and a porous TiO2 shell.The diameter of SiO2@Fe3O4 core was about 205 nm with thickness of porous TiO2 of about 5-6 nm.The 9%TiO2/6%SiO2@Fe3O4 microspheres possess the highest BET surface area and the BJH pore volume,which are 373.5 m2.g-1 and 0.28 cm3.g-1,respectively.The 9%TiO2/6%SiO2@Fe3O4 photocatalyst exhibited an excellent performance for the degradation of methyl orange and methylene blue dyes.Two different dyes were completely decolorized in 60 min under UV irradiation.The photocatalytic activity and the amount of catalyst were almost not decrease after recycling for 6 times by using external magnetic field.核心壳组织了 TiO2/SiO2@Fe3O4 光催化剂作为磁性的核心用 Fe3O4 被准备， tetraethoxysilane (TEOS ) 作为钛作为硅石来源和 tetrabutyl titanate (TBOT ) 采购原料。同样获得的结构由一个 SiO2@Fe3O4 核心和多孔的 TiO2 壳组成。SiO2@Fe3O4 核心的直径是有大约 5-6 nm 的多孔的 TiO2 的厚度的大约 205 nm。9%TiO2/6% SiO2@Fe3O4 microspheres 拥有最高的赌注表面区域和 BJH 毛孔体积，它是 373.5 m2as 2436

关 键 词：PHOTOCATALYST magnetic microspheres porous TiO2 DYESTUFF DEGRADATION 

分 类 号：TQ245[化学工程—有机化工] TG174.451[金属学及工艺—金属表面处理]