文章基本信息

标题：Complete mineralization of perfluorooctanoic acid (PFOA) by γ-irradiation in aqueous solution
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作者：Ze Zhang ; Jie-Jie Chen ; Xian-Jin Lyu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep07418
语种：English
出版社：Springer Nature
摘要：Decomposition of perfluorooctanoic acid (C₇F₁₅COOH, PFOA) has been gaining increasing interests because it is a ubiquitous environmental contaminant and resistant to the most conventional treatment processes. In this work, the rapid and complete mineralization of PFOA and simultaneous defluorination were achieved by γ-ray irradiation with a ⁶⁰Co source. The degradation rate of PFOA by γ-ray irradiation would be high, and a pseudo-first-order kinetic rate constant of 0.67 h⁻¹ could be achieved in the N₂ satured condition at pH 13.0. The experimental results and quantum chemical calculation confirmed that two radicals, i.e., hydroxyl radical (·OH) and aqueous electrons (e_aq⁻), were responsible for the degradation of PFOA, while only either e_aq⁻ or ·OH might not be able to accomplish complete mineralization of PFOA. The synergistic effects of ·OH and e_aq⁻ involved in the cleavage of C-C and C-F bonds, and therefore complete mineralization of PFOA were achieved. The intermediate products were identified and the degradation pathway was also proposed. The results of this study may offer a useful, high-efficient approach for complete mineralizing fluorochemicals and other persistent pollutants.