Abstract In this study, magnetic spinel Co3O4/CoFe2O4 composite were synthesized by the mechanical mixing of both powdered pristine samples. Then the catalyst was characterized by TEM, SEM, XRD, BET, XPS and VSM measurement. Next, Co3O4/CoFe2O4 composite was applied to degrade rhodamine B (RhB) in water by activating persulfate. Results showed that Co3O4/CoFe2O4 composite exhibited high efficiency for removal of RhB, and 95.59% of it could be degraded in 45 min. Besides, the effects of parameters, such as initial pH, PS dosage, Co3O4/CoFe2O4 composite dosage, initial concentration of RhB and temperture were studied. Also, the effects of coexisting anions on RhB degradation were observed and explained. Furthermore, we conducted the quenching experiment and found that sulfate radical and hydroxyl radicals were the main active radicals in the degradation process. Finally, recycle experiments proved that Co3O4/CoFe2O4 had a good stability for RhB degradation. In short, Co3O4/CoFe2O4 composite is a promising catalyst for wastewater treatment.

中文翻译：

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磁性Co3O4/CoFe2O4复合活化过硫酸盐有效去除有机污染物

摘要 在本研究中，磁性尖晶石 Co3O4/CoFe2O4 复合材料通过两种粉末原始样品的机械混合合成。然后通过TEM、SEM、XRD、BET、XPS和VSM测量对催化剂进行表征。接下来，应用 Co3O4/CoFe2O4 复合物通过活化过硫酸盐来降解水中的罗丹明 B (RhB)。结果表明，Co3O4/CoFe2O4复合材料对RhB的去除效率很高，45 min内可降解95.59%。此外，还研究了初始pH值、PS用量、Co3O4/CoFe2O4复合用量、RhB初始浓度和温度等参数的影响。此外，还观察并解释了共存阴离子对 RhB 降解的影响。此外，我们进行了淬灭实验，发现硫酸根自由基和羟基自由基是降解过程中的主要活性自由基。最后，循环实验证明 Co3O4/CoFe2O4 对 RhB 降解具有良好的稳定性。简而言之，Co3O4/CoFe2O4 复合材料是一种很有前途的废水处理催化剂。