A novel heterogeneous Fenton-like system (Mg/Fe-O₂) which could directly convert oxygen (O₂) to hydrogen peroxide/hydroxyl radicals (H₂O₂/^•OH) was developed and used to degrade 4-chlorophenol. The Mg/Fe bimetallic particles were prepared by chemical displacement process and characterized by XRD, SEM and TEM. The in situ continuous production of H₂O₂/^•OH and the effect of the mole ratio of Mg to Fe in the Mg/Fe bimetallic particles and the operating parameters on the degradation 4-chlorophenol in Mg/Fe-O₂ system were investigated in detail. It was found that the Mg/Fe bimetallic particles with the mole ratio of Mg to Fe of 32:1 had the best performance for the 4-chlorophenol degradation and the maximum cumulative concentration of H₂O₂, the degradation efficiency of 4-chlorophenol and the removal efficiency of TOC in Mg/Fe-O₂ system were 34.5 mg/L, 100% and 91.8%, respectively, at pH 3, O₂ flow rate 400 mL/min, dosage of Mg/Fe bimetallic particles 2 g/L, 4-chlorophenol initial concentration 50 mg/L and reaction time 60 min. It was revealed by radical scavenging experiments that ^•OH, particularly the surface-bound ^•OH, were the predominant reactive oxygen species in Mg/Fe-O₂ system for the degradation of 4-chlorophenol. The main intermediates of 4-chlorophenol degradation were detected by high-resolution liquid chromatography equipped with time-of-flight mass spectrometry (HRLC–ToF-MS) and ion chromatography (IC). Based the results of control experiments and the electrochemical tests, the possible pathway and mechanism of 4-chlorophenol degradation in Mg/Fe-O₂ system were tentatively proposed.

开发了一种新颖的非均质类Fenton样体系（Mg / Fe-O ₂），该体系可以直接将氧气（O ₂）转化为过氧化氢/羟基自由基（H ₂ O ₂ / ^• OH），并用于降解4-氯苯酚。通过化学位移法制备了Mg / Fe双金属颗粒，并通过XRD，SEM和TEM对其进行了表征。H ₂ O ₂ / ^• OH的原位连续生产以及Mg / Fe双金属颗粒中Mg与Fe的摩尔比以及操作参数对Mg / Fe-O _2中降解4-氯苯酚的影响系统进行了详细调查。结果表明，Mg / Fe摩尔比为32：1的Mg / Fe双金属颗粒对4-氯苯酚的降解性能最好，H ₂ O ₂的最大累积浓度，4-氯苯酚的降解效率最高。在pH 3，O ₂流速为400 mL / min，Mg / Fe双金属颗粒用量为2 g的条件下，在Mg / Fe-O ₂体系中TOC的去除效率分别为34.5 mg / L，100％和91.8％。/ L，4-氯苯酚初始浓度为50 mg / L，反应时间为60分钟。自由基清除实验表明，^• OH，尤其是表面结合的^• OH是Mg / Fe-O中主要的活性氧₂用于降解4-氯苯酚。通过配备了飞行时间质谱（HRLC-ToF-MS）和离子色谱（IC）的高分辨率液相色谱法检测了4-氯苯酚降解的主要中间体。根据控制实验和电化学测试结果，初步提出了4-氯苯酚在Mg / Fe-O ₂体系中降解的可能途径和机理。