Structural dependence of PFAS oxidation in a boron doped diamond-electrochemical system

Driven by long-term persistence and adverse health impacts of legacy perfluorooctanoic acid (PFOA), production has shifted towards shorter chain analogs (C4, perfluorobutanoic acid (PFBA)) or fluorinated alternatives such as hexafluoropropylene oxide dimer acid (HFPO-DA, known as GenX) and 6:2 fluor...

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Published in:Environmental research 2024-04, Vol.246, p.118103-118103, Article 118103
Main Authors: Asadi Zeidabadi, Fatemeh, Banayan Esfahani, Ehsan, Moreira, Raphaell, McBeath, Sean T., Foster, Johan, Mohseni, Madjid
Format: Article
Language:English
Subjects:
19F recovery
Alternative PFAS
Boron
Caprylates
Decomposition pathway
Diamond
Fluorine
Fluorine recovery
Fluorocarbons - analysis
Propionates
Reactive radicals
Telomer PFAS
Water Pollutants, Chemical - chemistry
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Summary:Driven by long-term persistence and adverse health impacts of legacy perfluorooctanoic acid (PFOA), production has shifted towards shorter chain analogs (C4, perfluorobutanoic acid (PFBA)) or fluorinated alternatives such as hexafluoropropylene oxide dimer acid (HFPO-DA, known as GenX) and 6:2 fluorotelomer carboxylic acid (6:2 FTCA). Yet, a thorough understanding of treatment processes for these alternatives is limited. Herein, we conducted a comprehensive study using an electrochemical approach with a boron doped diamond anode in Na2SO4 electrolyte for the remediation of PFOA common alternatives, i.e., PFBA, GenX, and 6:2 FTCA. The degradability, fluorine recovery, transformation pathway, and contributions from electro-synthesized radicals were investigated. The results indicated the significance of chain length and structure, with shorter chains being harder to break down (PFBA (65.6 ± 5.0%) 
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2024.118103