The sulfite (S(IV))-based advanced oxidation process is an emerging approach for the treatment of phenolic pollution. In this study, CoFe-layered double hydroxides (CoFe-LDHs), showing superior physicochemical properties as catalysts, were applied to activate S(IV) for bisphenol A (BPA) degradation. The results show that the Co/Fe molar ratios play a crucial role in regulating the physicochemical properties, degradation capacity, and activation mechanism of the catalysts, with Co3Fe1-LDH exhibiting the best performance in BPA degradation. The degradation of BPA is significantly influenced by pH and dissolved oxygen, and proceeds through bimetallic synergism and both radical and non-radical pathways. However, with increasing Co/Fe ratio, SO4•− gradually assumes a more prominent role in degradation by the system, and the contributions from high-valent metals and HO• gradually diminish. Additionally, the system brought about a substantial reduction in toxicity after degradation, and the catalyst demonstrated promise in consecutive recycling experiments, the degradation of other organics, and tests in actual water bodies.

中文翻译：

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CoFe-LDH 有效双金属活化亚硫酸盐去除双酚 A：Co/Fe 比例对 ROS 生成的关键作用


基于亚硫酸盐（S(IV)）的高级氧化工艺是处理酚类污染的新兴方法。在这项研究中，CoFe层状双氢氧化物（CoFe-LDHs）作为催化剂表现出优异的物理化学性质，被用来激活S（IV）以降解双酚A（BPA）。结果表明，Co/Fe摩尔比对调节催化剂的理化性质、降解能力和活化机制起着至关重要的作用，其中Co3Fe1-LDH在BPA降解方面表现出最佳性能。 BPA 的降解受 pH 值和溶解氧的显着影响，并通过双金属协同作用以及自由基和非自由基途径进行。然而，随着Co/Fe比的增加，SO4•−在系统降解中的作用逐渐变得更加突出，而高价金属和HO•的贡献逐渐减弱。此外，该系统在降解后毒性显着降低，并且该催化剂在连续的回收实验、其他有机物的降解以及实际水体测试中表现出了良好的前景。