Profiling the decomposition products of perfluorooctane sulfonate (PFOS) irradiated using an electron beam

Kim, Tae-Hun; Yu, Seung‐Ho; Choi, Yeowool; Jeong, Tae-Yong; Kim, Sang Don

doi:10.1016/j.scitotenv.2018.03.055

Cited by 48 publications

(36 citation statements)

References 26 publications

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“…7 Thermally unstable enol (−OH) could be transformed into the more stable keto ( O) form (C 6 F 13 COF) by HF elimination caused by the thermal transfer of e − aq . 13 Further, the hydrolysis of C 6 F 13 COF yields C 6 F 13 COOH with the loss of one more HF molecule.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

“…25 In ionizing radiation, attack of aqueous electrons, hydrogen atoms, and other reducing species may be the predominant initiating reaction mechanism of PFOA degradation. 13,14 There is very limited information on the fluorine mass balance in previous studies which suggests that many byproducts may not have been identified. For example, there is little information on the gaseous byproducts that may be produced.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Previous studies have consistently demonstrated the difficulty of breaking the stable C–F bonds by hydroxyl radicals generated as primary oxidants from conventional advanced oxidation processes (AOPs) such as UV/H 2 O 2 /O 3 . However, other AOPs such as photocatalysis, electrochemical oxidation, persulfate, sonolysis, microwave/persulfate, and ionizing radiation (electron beam, γ-irradiation) including plasma have been reported to be effective for treatment of some PFAS.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, ultrasonic pressure waves which can generate internal bubble temperatures of up to 4000 K lead to an instantaneous mineralization of PFOA/PFOS to F – , SO 4 2– , CO, and CO 2 without generating short chain PFCAs . In ionizing radiation, attack of aqueous electrons, hydrogen atoms, and other reducing species may be the predominant initiating reaction mechanism of PFOA degradation. , …”

Section: Introductionmentioning

confidence: 99%

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Breakdown Products from Perfluorinated Alkyl Substances (PFAS) Degradation in a Plasma-Based Water Treatment Process

Singh

Fernando

Baygi

et al. 2019

Environ. Sci. Technol.

264

185

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Byproducts produced when treating perfluorooctanoic acid (PFOA) and perfluorooctanesulfonate (PFOS) in water using a plasma treatment process intentionally operated to treat these compounds slowly to allow for byproduct accumulation were quantified. Several linear chain perfluoroalkyl carboxylic acids (PFCAs) (C4 to C7) were identified as byproducts of both PFOA and PFOS treatment. PFOA, perfluorohexanesulfonate (PFHxS), and perfluorobutanesulfonate (PFBS) were also found to be byproducts from PFOS degradation. Significant concentrations of fluoride ions, inorganic carbon, and smaller organic acids (trifluoroacetic acid, acetic acid, and formic acid) were also identified. In addition to PFCAs, PFHxS, and PFBS, trace amounts of 43 PFOA-related and 35 PFOS-related byproducts were also identified using a screening and search-based algorithm. Minor concentrations of gas-phase byproducts were also identified (<2.5% of the F originally associated with the parent molecules) some of which are reported for the first time in perfluoroalkyl substance degradation experiments including cyclic perfluoroalkanes (C4F8, C5F10, C6F12, C7F14, and C8F16). The short chain PFCAs detected suggest the occurrence of a stepwise reduction of the parent perfluoroalkyl substances (PFAS) molecule, followed by oxidation of intermediates, perfluoroalkyl radicals, and perfluoro alcohols/ketones. Using a fluorine mass balance, 77% of the fluorine associated with the parent PFOA and 58% of the fluorine associated with the parent PFOS were identified. The bulk of the remaining fluorine was determined to be sorbed to reactor walls and tubing using sorption experiments in which plasma was not generated.

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Section: Environmental Science and Technologymentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Breakdown Products from Perfluorinated Alkyl Substances (PFAS) Degradation in a Plasma-Based Water Treatment Process

Singh

Fernando

Baygi

et al. 2019

Environ. Sci. Technol.

264

185

View full text Add to dashboard Cite

show abstract

“…Various reductive decomposition processes have been demonstrated to be useful for the defluorination of PFAS, including aqueous electrons, hydrated electrons, iron, alkaline 2-propanol, and UV-irradiated iodide, orsulfites [22]. For example, ionising radiation via electron beams or gamma rays is promising for PFOS reduction [23]. Recently, sonochemical treatment of PFOS waste has reported complete mineralisation of fluorine [24].…”

Section: Introductionmentioning

confidence: 99%