Magnetic γ-Fe₂O₃ supported on mesoporous ZnFe₂O₄ was synthesized by impregnation and deposition–precipitation methods. The obtained γ-Fe₂O₃/ZnFe₂O₄ was found to be an effective catalyst for the degradation and mineralization of Orange II with H₂O₂ under visible light irradiation, which can be attributed to the enhanced production of OH and particularly O₂⁻. The catalytic mechanism of γ-Fe₂O₃/ZnFe₂O₄ for H₂O₂ activation and the degradation pathway of Orange II were investigated. The result indicates that the loaded γ-Fe₂O₃ could capture the electrons in the conductive band of ZnFe₂O₄, thus promoting the formation of O₂⁻ from the reaction between H₂O₂ and holes. Meanwhile, the formed Fe²⁺ and electrons could react with H₂O₂ to produce OH. According to the results of liquid chromatography-mass spectrometry, electron paramagnetic resonance and scavenger experiments, Orange II should be mainly degraded by O₂⁻ but not OH due to the destruction of azo bond, while its intermediates were further mineralized by O₂⁻ and OH.

磁性了γ-Fe ₂ ö ₃支撑在孔的ZnFe ₂ ö ₄通过浸渍和沉积-沉淀方法来合成。将所得到的γ-的Fe ₂ ö ₃ /的ZnFe ₂ ö ₄被认为是对二号橙用H降解和矿化的有效催化剂₂ ö ₂可见光照射下，这可以归因于所述增强的产量OH，特别Ø ₂ ^- 。催化机理了γ-Fe ₂ ö ₃ /的ZnFe ₂ ø ₄用于h_研究了O _2的2 O ₂活化和降解途径。结果指示装入了γ-Fe ₂ ö ₃可以捕获电子在的ZnFe的导电带₂ ö ₄，从而促进形成ø ₂ ^-选自H之间的反应₂ Ò ₂和空穴。同时，形成的Fe ²⁺和电子可与H ₂ O ₂反应生成OH。根据液相色谱-质谱，电子顺磁共振和清除剂实验的结果，Orange II应主要通过以下方式降解：ö ₂ ^-但不是OH由于偶氮键的破坏，同时它的中间体进一步通过矿化ö ₂ ^-和OH。