Advanced reduction processes initiated by oxidative radicals for trichloroacetic acid degradation: Performance, radical generation, and mechanism

文献类型： 外文期刊

第一作者： Zhang, Qiang

作者： Zhang, Qiang;Wang, Xiaolei;Zhu, Changyin;Qin, Wenxiu;Huang, Danyu;Zhou, Dongmei;Wu, Nannan;Wu, Nannan;Zhu, Changyin;Qin, Wenxiu

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关键词： Trichloroacetic acid; CO2 center dot- radicals; Persulfate; Formic acid; Advanced reduction process

期刊名称：WATER RESEARCH （ 影响因子：12.4； 五年影响因子：12.9 ）

ISSN： 0043-1354

年卷期： 2025 年 268 卷

页码：

收录情况： SCI

摘要： The degradation of haloacetic acids (HAAs) in aqueous environments poses a challenge due to their oxidative resistance. Given that HAAs are highly carcinogenic disinfection byproducts, it is imperative to develop effective degradation methods to reduce their potential health risk. In this study, we found that only 27.2% of 200 mu M trichloroacetic acid (TCA) was removed in the UV-activated persulfate (PS) system after 2 h, while complete removal was achieved with the addition of 15 mM formic acid (FA). The main products of TCA degradation were dichloroacetic acid and monochloroacetic acid. Results from free radical quenching experiments and electron paramagnetic resonance spectroscopy analyses indicated that reductive carbon dioxide radical (CO2 center dot-) was the main active species responsible for TCA reduction. Oxidative radicals (i.e., SO4 center dot- and center dot OH) generated from PS activation reacted with FA to form CO2 center dot-, efficiently degrading TCA. The effects of PS and FA concentrations, solution pH, anions (e.g., Cl-, SO42-, and HCO3-), and small organic molecules (e.g., methanol, ethanol, and acetic acid) on degradation efficiency were examined. Overall, this study proposes a simple and efficient method to improve the degradation efficiency of HAAs in the UV/PS system and provides new insights into the advanced reduction processes used for water treatments.

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