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• W2625366249 endingPage "1133" @default.
• W2625366249 startingPage "1125" @default.
• W2625366249 abstract "Abstract As one of the most reactive species, hydrated electron (e aq − ) is promising for decomposing recalcitrant organic pollutants, such as perfluorooctanoic acid (PFOA). In this study, PFOA decomposition was systematically investigated using a high photon flux ultraviolet (UV)/sulfite system. It showed had fast PFOA decomposition kinetics through significant promotion of e aq − production at favorable pH condition (pH > 9.2). At initial solution pH 9.2, with initial dissolved oxygen (DO) about 5 mg/L, and at around 25 °C, all PFOA was decomposed to less fluorinated compounds within 10 min from its initial concentration of 38.7 μM. Accompanying PFOA decomposition, short chain perfluorocarboxylic acids (PFCAs) and less fluorinated compounds were detected, indicating a stepwise decomposition mechanism. The k obs of PFOA decomposition was 0.455 min −1 , and approximately 6–910 folds faster than those reported by other reductive methods. At a fixed UV photon flux, PFOA decomposition kinetics showed a positive linear dependence with the initial sulfite dosage. Increasing initial sulfite dosage at a less favorable pH condition (pH 8.0) showed enhancement in PFOA decomposition. But it does not work at acidic and neutral pH conditions. The residual sulfite in the treated solution has acute toxicity, but it can be efficiently removed by using aeration. The outcomes of study will extend the understanding of the high photon flux UV/sulfite treatment system, and help to facilitate its further practical use in recalcitrant organic pollutants decomposition." @default.
• W2625366249 created "2017-06-23" @default.
• W2625366249 creator A5052441498 @default.
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• W2625366249 date "2017-10-01" @default.
• W2625366249 modified "2023-10-01" @default.
• W2625366249 title "Efficient decomposition of perfluorooctanoic acid by a high photon flux UV/sulfite process: Kinetics and associated toxicity" @default.
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• W2625366249 doi "https://doi.org/10.1016/j.cej.2017.05.156" @default.
• W2625366249 hasPublicationYear "2017" @default.
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