文献类型：期刊文献

英文题名：Magnetic composite microspheres with exposed {001} faceted TiO2 shells: A highly active and selective visible-light photocatalyst

作者：Shen, Jianhua[1]; Zhu, Yihua[1]; Yang, Xiaoling[1]; Li, Chunzhong[1]

机构：[1] Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2012

卷号：22

期号：26

起止页码：13341

外文期刊名：Journal of Materials Chemistry

收录：EI(收录号：20122615156543)

语种：英文

外文关键词：Azo dyes - Light - Photocatalysis - Plasmonics - Efficiency - Titanium dioxide - Hydrogen production - Magnetite - Nanocrystals

摘要：We have demonstrated a sandwich-structured Fe3O 4/SiO2/Au/TiO2 photocatalyst, which shows magnetic separability, selective absorption and photocatalysis activity, and high efficiency, in catalyzing the decomposition of organic compounds under illumination of visible-light and simulated sunlight. The structural design of the photocatalyst takes advantage of the dense, homogeneous structure and the AuNPs content (ca. 4 nm, 1.63 wt%), which is prepared by a simple method. It possesses high efficiency visible-light photocatalytic activity due to the stable from nonmetal-doping and the plasmonic metal decoration, which enhances light harvesting and charge separation, and the small grain size of the anatase nanocrystals, which reduces the exciton recombination rate. More importantly, the catalyst is synthesized by a combination of plasmonic metal decoration of TiO2 nanocrystals with exposed {001} facets, and the selective adsorption and photocatalytic decomposition of azo dyes is accomplished by design of the surface chemistry. Additionally, these sandwich-structured photocatalysts can be applied to other catalytic system such as dye decoloration, water decomposition, hydrogen generation, and so on. ? 2012 The Royal Society of Chemistry.