Peroxyacetic acid (PAA), as an oxidizing agent, has gained significant attention in the field of advanced oxidation because of its low toxicity and high degradation capacity. In this study, cobalt-iron-based Prussian blue analogs (Co-PBAs) were utilized for the first time to activate PAA for tetracycline degradation. In the Co-PBAs/PAA system, organic radicals (RO•) and high-valent metal oxides are mainly produced. TC is efficiently removed in a wide pH range (5−9) and a variety of interferences (Cl-, SO42-, bicarbonate ions (HCO3-), humic acid, and the actual water bodies) in water bodies due to the specificity of RO•. Interestingly, the catalytic rate of the Co-PBAs/PAA system was significantly accelerated in the presence of HCO3- (kobs increasing from 0.171 min−1 to 0.534 min−1). This enhancement is attributed to the reaction between HCO3- and PAA, and carbonate radicals (•CO3-) and acetyl peroxyl radicals (CH3C(O)OO•) are generated and then react with the phenolic hydroxyl group of TC. In this study, the mechanism of PAA activation by Co-PBAs was revealed, and PAA-based advanced oxidation process enhanced by HCO3- was provided for the removal of pollutants from wastewater.

中文翻译：

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碳酸氢根离子促进 Co（II）Fe（II）/过氧乙酸体系中污染物的快速降解


过氧乙酸 （PAA） 作为一种氧化剂，因其低毒性和高降解能力而在高级氧化领域受到了极大的关注。在这项研究中，首次使用钴铁基普鲁士蓝类似物 （Co-PBA） 来激活 PAA 进行四环素降解。在 Co-PBAs/PAA 系统中，主要产生有机自由基 （RO•） 和高价金属氧化物。由于 RO•的特异性，TC 在较宽的 pH 范围 （5-9） 和水体中的各种干扰物（Cl-、SO42-、碳酸氢根离子 （HCO3-）、腐殖酸和实际水体）中被有效去除。有趣的是，在 HCO3- 存在下，Co-PBAs/PAA 系统的催化速率显着加快 （kobs 从 0.171 min-1 增加到 0.534 min-1）。这种增强归因于 HCO3- 和 PAA 之间的反应，生成碳酸盐自由基 （•CO3-） 和乙酰过氧自由基 （CH3C（O）OO•），然后与 TC 的酚羟基反应。在本研究中，揭示了 Co-PBAs 激活 PAA 的机制，并提供了由 HCO3- 增强的基于 PAA 的高级氧化过程以去除废水中的污染物。