为了提高Fe3O4的催化活性,制备了磁性CeO2/Fe3O4复合纳米粒子,构成非均相Fenton反应体系,催化降解水环境中的氧氟沙星抗生素.研究了CeO2含量、H2O2浓度、pH等因素对CeO2/Fe3O4非均相催化活性的影响,并通过溶出铁离子测定、动力学拟合等方式对反应机理进行探究.结果表明,CeO2/Fe3O4较Fe3O4具有更强的催化活性,氧氟沙星的降解率随CeO2含量、H2O2浓度和溶液酸度的增加而提高,当H2O2浓度为100 mmol/L以及pH为3时,CeO2/Fe3O4(摩尔比=0.780)-H2O2体系催化降解氧氟沙星的效果最佳.CeO2/Fe3O4体系催化降解氧氟沙星反应遵循一级反应动力学方程,反应机理主要为催化剂表面的催化反应,同时CeO2产生氧空位的电子转移对Fe3O4的催化反应起到协同强化的作用.
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