Preparation and properties of a nano TiO_2/Fe_3O_4 composite superparamagnetic photocatalyst

作     者：LI Yuxiang ZHANG Mei GUO Min WANG Xidong LI Yuxianga, ZHANG Meia, GUO Mina, and WANG Xidongb a School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China b College of Engineering, Peking University, Beijing 100871, China

作者机构：School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China College of Engineering Peking University Beijing 100871 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2009年第28卷第5期

页      面：423-427页

核心收录：

学科分类：081705[工学-工业催化] 0806[工学-冶金工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 50872011, 50402022, and 50672006) the National Basic Research Program of China (No. 2007CB613608) 

主　　题：photocatalysis superparamagnetism sol-gel method TiO2 Fe3O4 

摘      要：Nano TiO2/Fe3O4 composite particles with different molar ratios of TiO2 to Fe3O4 were prepared via sol-gel method. X-ray diffraction, transmission electron microscopy, and vibration sample magnetometry were used to characterize the TiO2/Fe3O4 particles. The photocatalytic activity of the particles was tested by degrading methyl blue solution under UV illumination （254 nm）. The results indicate that with the content of TiO2 increasing, the photocatalytic activity of the composite particles enhances, while the magnetism of the particles decreases. When the molar ratio of TiO2 to Fe3O4 is about 8, both the photocatalytic activity and magnetism of the TiO2/Fe3O4 particles are relatively high, and their photocatalytic activity remains well after repeated use.