Herein, binary composite catalysts based on MnO₂ and CoFe₂O₄ were prepared to degrade bisphenol A (BPA) and dimethyl phthalate (DMP) by coupling with peroxymonosulfate (PMS), in which CoFe₂O₄ was located either at the outer (MnO₂@CoFe₂O₄) or at the inner (CoFe₂O₄@MnO₂) positioning. The catalysts possessed higher degradation efficiency than both pristine CoFe₂O₄ and MnO₂, in which MnO₂@CoFe₂O₄ provided the highest PMS activation capability. The positioning of each component influenced significantly the variety and intensity of the generated reactive oxidative species, in which MnO₂@CoFe₂O₄ generated more hydroxyl radical (OH) whereas CoFe₂O₄@MnO₂ generated more non-radical singlet oxygen (¹O₂). Therefore, MnO₂@CoFe₂O₄ could degrade both BPA and DMP with high degradation rate, while CoFe₂O₄@MnO₂ only exhibited promising degradation efficiency towards BPA since DMP was inert to ¹O₂. Comparatively, CoFe₂O₄@MnO₂ had better catalytic stability and water matrix adaptability than MnO₂@CoFe₂O₄ when degrading BPA, since OH was vulnerable water with complicated compositions. This study provides a new insight for the design and selection of composite catalyst towards the degradation of organic pollutants with discrepant structures and properties.

在此，制备了基于MnO ₂和CoFe ₂ O ₄的二元复合催化剂，通过与过氧一硫酸盐（PMS）偶联来降解双酚A（BPA）和邻苯二甲酸二甲酯（DMP），其中CoFe ₂ O ₄位于外层（ MnO ₂ @CoFe ₂ O ₄ )或在内部(CoFe ₂ O ₄ @MnO ₂ )定位。_{该催化剂比原始的CoFe 2} O ₄和MnO ₂具有更高的降解效率，其中MnO ₂ @CoFe ₂ O ₄提供了最高的 PMS 激活能力。每个组分的位置显着影响生成的活性氧化物种的种类和强度，其中 MnO ₂ @CoFe ₂ O ₄生成更多的羟基自由基 ( OH) 而 CoFe ₂ O ₄ @MnO ₂生成更多的非自由基单线态氧 ( ¹ O ₂）。因此，MnO ₂ @CoFe ₂ O ₄可以降解BPA和DMP，降解率高，而CoFe ₂ O ₄ @MnO ₂由于 DMP 对¹ O ₂呈惰性，因此仅对 BPA 表现出有希望的降解效率。相比之下，CoFe ₂ O ₄ @MnO ₂在降解BPA时比MnO ₂ @CoFe ₂ O ₄具有更好的催化稳定性和水基体适应性，因为OH是易受水且成分复杂。该研究为复合催化剂的设计和选择提供了新的思路，以降解具有差异结构和性能的有机污染物。