(1. 中國科學(xué)院 廣州能源研究所， 廣州 510070;
2. 廣東省生態(tài)環(huán)境與土壤研究所， 廣州 510640;
3. 廣東省農(nóng)業(yè)環(huán)境綜合治理重點實驗室， 廣州 510650；
4. 華南理工大學(xué) 應(yīng)用化學(xué)系， 廣州 510640)
摘 要: 以Fe3O4為載體，制備了易于固液分離回收的磁性復(fù)合納米光催化劑，采用SEM、元素分析、XRD等方法表征催化劑的表面形貌、晶體結(jié)構(gòu)。結(jié)果表明，二氧化鈦包裹在Fe3O4的表面，其包裹量越大，粒徑越大，銳鈦礦峰越強。利用光催化降解甲基橙的效果來考察磁性復(fù)合光催化劑的活性，直接包裹在Fe3O4表面的TiO2活性低于純TiO2的，而在Fe3O4與TiO2之間包裹SiO2，可以有效地提高其光催化活性，其活性與純TiO2接近。
關(guān)鍵字: 磁性納米催化劑； 光催化； 制備； 二氧化鈦
and their photo-catalytic activity and properties
WANG Liang-yan1, XU Yue-hua4, HUANG Cong1
（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
