选择硅藻土为研究对象，将硝酸铁与硝酸锰在缓冲溶液中共沉淀于硅藻壳体上，制备新型非均相Fenton复合材料。利用XRD及SEM等分析手段表征了双活性位点Fe₂O₃与MnO₂在硅藻壳体上的微观形貌及负载形式。通过非均相Fenton反应处理模拟罗丹明B废水来检验复合材料的催化活性，考察不同pH、温度、催化剂用量及染料初始浓度等反应条件下拟合硅藻土-Fe₂O₃/MnO₂复合材料对罗丹明B降解的动力学参数。结果表明，负载在硅藻壳体上的双活性位点Fe₂O₃与MnO₂通过协同作用完成了一个价态循环来催化H₂O₂生成的·OH。

Taking diatomite as the research object,a novel heterogeneous Fenton composite material is prepared through co-precipitating iron nitrate and manganese nitrate together on diatom shell in a buffer solution environment.The loading form and microscopic morphology of Fe₂O₃ and MnO₂ on diatom shell are reflected by XRD,SEM and other means.Heterogeneous Fenton reaction is used to treat simulated RhB wastewater to evaluate the catalytic activity of the composite.Comparison of removal efficiency of RhB is investigated under different pH,temperature,catalyst dosage and initial concentration to test the catalytic activity of the composite and its degradation kinetic parameters against RhB.It is found that Fe₂O₃ and MnO₂,two active sites on diatom shell,cooperate to complete a valence state cycle to catalyze ·OH generated from H₂O₂.