Co/N-TiO_2核壳型多功能复合材料的制备及其光催化性能研究  

Synthesis of Multi-functional Co/N-TiO_2 with Core-shell Structure and Study on its Performance of Photocatalytic Degradation

作　　者：韩博[1] 赵富春[2] 

机构地区：[1]江汉大学化学与环境工程学院,湖北武汉430056 [2]华南热带农业大学理工学院,海南儋州571737

出　　处：《广州化工》2007年第2期23-26,共4页GuangZhou Chemical Industry

摘　　要：采用两步法合成了同时具备磁性和光催化性的Co／N-TiO2核壳型多功能复合材料，Co／N-TiO2核壳型多功能复合材料中钴核粒径约为150nm，而N-TiO2壳层厚度约为200nm。紫外-可见漫反射光谱表明氮掺杂后TiO2的禁带宽度降为2．91eV，TiO2吸收带产生了的红移，在400～600nm的范围内有了明显的吸收；磁性检测结果显示Co／N-TiO2是铁磁性的，其饱和磁化强度Ms=37．5emu·g^-1，剩余磁化强度Mr=10．4emu·g^-1，矫顽力为143．2Oe。用所制备的Co／N-TiO2作为光催化剂，在可见光的照射下光催化降解碱性品红6h后，碱性品红可完全脱色，24h后COD去除率可达79．4％。A multi-functional composite, Co/N-TiO2 with core-shell structure was synthesized by two-step process. The average particle size of the cobalt core and the thickness of the N-TiO2 shell were about 150 nm and 250 nm respectively. Doping of N into TiO2 resulted in the decrease in the band gap of TiO2, which could obviously expand the absorption region of TiO2 from UV region to Vis region. The room-temperature hysteresis loop of the Co/N-TiO2 showed ferromagnetic behaviors, and Ms （ saturation magnetization） , Mr （ remnant magnetization）, coercivity was 37.5 emu·g^-1, 10.4 emu·g- 1143.2Oe respectively. The Co/N-TiO2 catalyst could effectively degrade basic violet under visible irradiation, decolorization ratio of basic violet could reach 100% at reaction time of 6 h and the ODD removal could reach 79.4% at reaction time of 24 h. It was found that the Co/N-TiO2 catalyst could be easily recycled by a external magnet, and Co/N-TiO2 was rather stable against catalyst poison.

关 键 词：钴 氮掺杂 二氧化钛 核壳型 碱性品红 

分 类 号：O643.36[理学—物理化学]