Fe_3O_4/聚丙烯酸/CdS复合粒子的光化学制备及光催化性能  

Photochemical preparation and photocatalytic performance of Fe_3O_4/polyacrylic acid/CdS composite particles

作　　者：冒卫星[1] 穆肖 吴凯萍[1] 康志成[1] 佘文强[1] 宫培军[1] 

机构地区：[1]浙江师范大学化学与生命科学学院,金华321004

出　　处：《辐射研究与辐射工艺学报》2014年第1期50-57,共8页Journal of Radiation Research and Radiation Processing

基　　金：浙江省磁性材料重点创新团队子项目(2011R09006-06);浙江省自然科学基金(Y4100074)资助

摘　　要：采用光引发丙烯酸聚合的方法对Fe3O4纳米粒子进行表面改性,制备了羧基功能化的Fe3O4/聚丙烯酸复合纳米粒子(Fe3O4/PAA);以Fe3O4/PAA为磁核,以硫酸镉和硫代硫酸钠为原料,采用光化学方法制备Fe3O4/聚丙烯酸/CdS复合粒子(Fe3O4/PAA/CdS),并借助红外光谱、X射线粉末衍射、透射电子显微镜、荧光光谱和振动样品磁强计对其进行表征。结果表明,核-壳结构的Fe3O4/PAA/CdS为表面粗糙的球形粒子,平均粒径为155 nm,具有发光性能和准超顺磁性。Fe3O4/PAA/CdS在有机染料罗丹明B的降解实验中显示出良好的可见光催化活性,可以借助磁铁在2 min内从溶液中完全回收。Poly （acrylic acid）-functionalized magnetic nanoparticles （Fe3O4/PAA） were synthesized by polymerization of acrylic acid initiated by UV light. CdS-modified Fe3O4/PAA composite particles （Fe3O4/PAA/CdS） were photoehemically prepared in aqueous solution containing cadmium sulfate and sodium thiosulfate with Fe3O4/PAA as the magnetic core. The composite particles were characterized by infrared spectroscopy （IR）, X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, photoluminescence measurement （PL）, and vibrating sample magnetometer （VSM）. The results show that the mean size of Fe3O4/PAA/CdS spheres with core-shell structure and rough surface is about 155 nm and the size distribution is rather wide. The composite spheres also exhibit luminescent and quasi-superparamagnetic properties. Besides, the magnetic composite spheres possess excellent activity as a recyclable photocatalyst for the degradation of Rhodamin B when exposed to visible light irradiation and can be covered by a magnet from aqueous solution within 2 min.

关 键 词：光化学合成 磁性复合粒子 硫化镉 光催化 

分 类 号：TL13[核科学技术—核能科学] O644.14[理学—物理化学]