超氧化物
化学
全氟辛酸
黄嘌呤氧化酶
次黄嘌呤
环境化学
降级(电信)
生物化学
酶
计算机科学
电信
作者
Hassan Javed,Jordin Metz,Toprak Eraslan,Jacques Mathieu,Bo Wang,Gang Wu,Ah‐Lim Tsai,Michael S. Wong,Pedro J. J. Alvarez
出处
期刊:Environmental Science and Technology Letters
[American Chemical Society]
日期:2020-07-13
卷期号:7 (9): 653-658
被引量:49
标识
DOI:10.1021/acs.estlett.0c00505
摘要
Perfluorooctanoic acid (PFOA) is a widely distributed recalcitrant contaminant. In recent years, advanced oxidation processes have been explored for PFOA degradation, yet factors influencing their efficacy and degradation mechanism are not fully understood. Here, we resolve ambiguity in the literature regarding the role of superoxide in PFOA degradation (e.g., by nucleophilic attack) by considering three pure superoxide-producing systems: KO2 in dimethyl sulfoxide, xanthine oxidase with hypoxanthine, and WOx/ZrO2 catalyst with H2O2. Superoxide production was confirmed in all systems by electron paramagnetic resonance spectroscopy and by precipitation of nitroblue tetrazolium, a common superoxide probe. Positive control experiments showed that the produced superoxide degrades ∼48% of bisphenol A within 1 day, corroborating the fact that superoxide was sufficiently stable and available for reaction in the test systems. However, no PFOA degradation was observed, which was corroborated by the absence of fluoride and degradation byproducts in all three systems. Therefore, other reaction pathways should be explored for PFOA degradation.
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