Peracetic acid (PAA) has been used as a disinfectant/oxidant in wastewater treatment. However, considering that the presence of iodide (I⁻) would induce the iodinated products in wastewater, the effect of I⁻ on the transformation of phenolic pollutants by PAA was investigated. Herein, the presence of I⁻ enhanced the transformation of phenolic pollutants (bisphenol S (BPS), bisphenol A (BPA), and p-hydroxybenzoic acid (p-HBA)) by PAA. Furthermore, hypoiodous acid (HOI) was reactive species in the PAA/I⁻ system based on radical quenching experiments and electron spin resonance. In this system, PAA, together with ¹O₂ that was produced in PAA oxidized I⁻ into HOI. Increasing PAA and I⁻ dose promoted the transformation of phenolic pollutants but the promoting effect was less significant at higher dosage. The increase in H₂O₂ dose retarded the transformation of phenolic pollutants because of HOI being quenched by H₂O₂. In a wide range of pH (pH 4.0–10.0), the transformation of BPS, BPA, and p-HBA was pH-dependent and most effective at pH 7.0. The presence of chloride and bromide accelerated the transformation of phenolic pollutants by PAA/I⁻ due to the formation of HOCl and HOBr. Furthermore, HOI substitution was the primary reaction pathway in the transformation of BPS, BPA, and p-HBA by PAA/I⁻. Finally, the transformation products of phenolic pollutants during the PAA/I⁻ posed higher cytotoxicity compared to the parent pollutants. Overall, our findings improved the understanding of the chemical behavior of PAA in the presence of I⁻ and suggested that the generation of iodinated products raised concerns for water safety.

过氧乙酸（PAA）已在废水处理中用作消毒剂/氧化剂。^{然而，考虑到碘化物( I−} )的存在会导致废水中产生碘化产物，因此研究了^I−对PAA转化酚类污染物的影响。^{其中，I -}的存在增强了PAA 对酚类污染物（双酚 S ( BPS)、双酚 A (BPA) 和对羟基苯甲酸 ( p -HBA)）的转化。此外，根据自由基猝灭实验和电子自旋共振，次碘酸（HOI）是PAA/I ^{-系统中的活性物质。}在该系统中，PAA与PAA中产生的¹ O _2一起将I ^-氧化成HOI。增加PAA和I-^剂量可促进酚类污染物的转化，但较高剂量时促进作用不太显着。_{H 2} O ₂剂量的增加延缓了酚类污染物的转化，因为HOI被H ₂ O ₂猝灭。在较宽的 pH 范围内（pH 4.0–10.0），BPS、BPA 和p -HBA的转化具有 pH 依赖性，并且在 pH 7.0 时最有效。由于形成 HOCl 和 HOBr，氯化物和溴化物的存在加速了 PAA/ ^I对酚类污染物的转化。此外，HOI取代是PAA/I ^-转化BPS、BPA和p -HBA的主要反应途径。最后，与母体污染物相比^， PAA/I期间酚类污染物的转化产物具有更高的细胞毒性。总体而言，我们的研究结果加深了对 I 存在下 PAA 化学行为的理解，^并表明碘化产品的生成引起了人们对水安全的担忧。