Interaction of peracetic acid with chromium(III): Understanding degradation of coexisting organic pollutants in water
Interaction of peracetic acid with chromium(III): Understanding degradation of coexisting organic pollutants in water
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过氧乙酸与铬(III) 的相互作用：了解水中共存有机污染物的降解
DOI：
10.1016/j.jhazmat.2022.129537
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发表时间：
2022
影响因子：
13.6
通讯作者：
Sharma, Virender K.
中科院分区：
文献类型：
--
作者：
Bell, Joshua;Wen, Yinghao;Ma, Xingmao;McDonald, Thomas J.;Huang, Ching-Hua;Sharma, Virender K.
过氧乙酸(PAA，CH3C(O)OOH)因其在废水消毒中的应用而备受关注。废水通常同时含有金属离子和有机污染物，需要了解在此类受污染的水中加入PAA后的反应。本文介绍了铬(III)(Cr(III))与PAA之间的相互作用对某些药物，主要是甲氧苄啶(TMP)的降解的影响。考察了在不同条件下(pH=6.0~10.0，PAA与Cr(III)的摩尔比)，PAA、PAA-Cr(III)和H_2O_2-Cr(III)对药物的降解作用。在碱性条件下，PAA-Cr(III)对TMP的降解速率大于PAA和H_2O_2-Cr(III)。使用猝灭剂和探测分子进行的降解研究以及光谱测量(UV-可见光和电子顺磁共振)表明·OH是主要的自由基物种，而Cr(IV)/Cr(V)是额外的反应物种。对PAA-Cr(III)氧化TMP的产物进行了鉴定，提出了可能的氧化途径。研究了PAA-Cr(III)和H_2O_2-Cr(III)体系对不同分子结构药物的降解作用。与PAA单独作用相比，PAA-Cr(III)和H_2O_2-Cr(III)对大多数药物的降解速度更快，表明共存金属离子在水处理中对PAA的氧化可能起着重要的作用。
Peracetic acid (PAA, CH3C(O)OOH) has gained significant attention for its use in wastewater disinfection. Wastewater usually contains both metal ions and organic pollutants and understanding reactions after adding PAA to such contaminated water is needed. This paper presents results regarding the effect of interactions between chromium(III) (Cr(III)) and PAA on the degradation of selected pharmaceuticals, mainly trimethoprim (TMP). The degradation of pharmaceuticals by PAA, PAA-Cr(III), and H2O2-Cr(III) under different conditions was examined (pH = 6.0–10.0 and molar ratios of PAA to Cr(III)). The degradation rate of TMP by PAA-Cr(III) was greater than by PAA and H2O2-Cr(III) under alkaline conditions. Degradation studies using quenching agents and probing molecules, and spectroscopic measurements (UV–visible and electron paramagnetic resonance) suggest•OH as the major radical species and Cr(IV)/Cr(V) as additional reactive species. The oxidized products of TMP by PAA-Cr(III) were identified and possible pathways proposed. Degradation of other pharmaceuticals having different molecular structures by PAA-Cr(III) and H2O2-Cr(III) systems were also investigated. Most of the pharmaceuticals degraded at faster rates by PAA-Cr(III) and H2O2-Cr(III) than by PAA alone, suggesting that co-present metal ions may play a significant role in PAA oxidation in water treatment.