利用共沉淀及退火处理两步法,合成了具有核壳结构的磁性Fe3O4/ZnO纳米材料.采用X射线衍射仪、红外光谱仪、透射电子显微镜及振动样品磁强计(VSM)等技术对材料的组分、形貌及磁力性质进行表征,并以氙灯为光源,以四环素(TC)、强力霉素(DC)和盐酸土霉素(OTC)3种四环素类抗生素为降解目标,模拟测试样品在日光下的光催化活性,并通过改变Zn2+浓度,调节包覆结构从而得到最佳光催化效果.研究表明,ZnO包覆在Fe3O4表面并随Zn2+浓度增大逐渐形成尺寸在100 nm的锥形结构,当Zn2+浓度为0.5 mol/L时,样品对TC、DC和OTC的降解率最大,分别为85％、78％和64％.基于以上的研究显示,合成的磁性Fe3O4/ZnO核壳材料可应用去除水中抗生素,是一种具有高催化活性且能回收利用的新型复合光催化剂.
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