(1. 中国科学院 广州能源研究所， 广州 510070;
2. 广东省生态环境与土壤研究所， 广州 510640;
3. 广东省农业环境综合治理重点实验室， 广州 510650；
4. 华南理工大学 应用化学系， 广州 510640)
摘 要: 以Fe3O4为载体，制备了易于固液分离回收的磁性复合纳米光催化剂，采用SEM、元素分析、XRD等方法表征催化剂的表面形貌、晶体结构。结果表明，二氧化钛包裹在Fe3O4的表面，其包裹量越大，粒径越大，锐钛矿峰越强。利用光催化降解甲基橙的效果来考察磁性复合光催化剂的活性，直接包裹在Fe3O4表面的TiO2活性低于纯TiO2的，而在Fe3O4与TiO2之间包裹SiO2，可以有效地提高其光催化活性，其活性与纯TiO2接近。
关键字: 磁性纳米催化剂； 光催化； 制备； 二氧化钛
and their photo-catalytic activity and properties
（1. Guangzhou Institute of Energy Conversion,
Chinese Academy of Sciences, Guangzhou 510070, P.R.China;
2. Guangdong Institute of Eco-Environment
and Soil Sciences, Guangzhou 510640, P.R.China;
3. Guangdong Key Laboratory of Agricultural Environment Integrated Control,
Guangzhou 510650, P.R.China;
4. Department of Applied Chemistry, South China University of Technology,
Guangzhou, 510640, P.R.China）
Abstract:Innovative nanometer-sized magnetic photo-catalysts, which are named as TiO2/NiPc/Fe3O4 or TiO2/SiO2/NiPc/Fe3O4 and are liable to be separated and recovered, were prepared using Fe3O4 as support. The surface morphology and crystal pattern were investigated by means of SEM, element analysis and XRD. The results showed that TiO2 wraps on the surface of Fe3O4, and that the particle size and the intensity of anatase (101) peaks increased with the increase of TiO2 content. As a probe reaction, the photo-catalytic activity is evaluated by methyl orange photo-oxidation. When TiO2 directly wraps on the surface of Fe3O4, the photo-catalytic activity is lower than that of pure TiO2. However, when SiO2 wraps on the surface of Fe3O4 at first, and then TiO2 wraps on the surface of SiO2, the photocatalytic activity of TiO2/SiO2/NiPc/Fe3O4 is near to that of pure TiO2.
Key words: nanometer-sized magnetic photo-catalysts; photo-catalysis; preparation; titanium dioxide
