采用柠檬酸盐前驱体技术,合成了粒径约为20～70 nm的尖晶石结构MnFe2O4纳米颗粒,用聚乙烯亚胺(PEI)对MnFe2O4纳米颗粒进行表面处理后,以异丙醇钛为前驱物,采用sol-gel法在纳米MnFe2O4表面包覆锐钛矿型TiO2纳米层形成核壳结构.利用透射电子显微镜(TEM)、X射线衍射仪(XRD)和振动样品磁强计等测试手段对样品的结构、形貌、粒径以及磁学性能等进行了表征.采用罗丹明B的光催化降解反应对所制催化剂的活性进行了评价.结果表明,核壳结构TiO2/MnFe2O4复合纳米颗粒的光催化活性随着壳层厚度的增加而增强,当达到一定厚度以后,其催化活性不随壳层厚度的增加而改变.复合颗粒中TiO2含量达到30 wt%,反应时间4 h时,TiO2/MnFe2O4磁性光催化剂对罗丹明B的光降解率达到100%,与纯TiO2纳米粉体的催化活性相当,且光催化活性稳定,是一种便于回收、可重复使用的高效光催化剂.
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