Boron doped diamond electrooxidation of 6:2 fluorotelomers and perfluorocarboxylic acids. Application to industrial wastewaters treatment

Abstract: The aim of this study was to determine the viability of electrochemical oxidation to degrade and mineralize poly- and perfluoroalkyl substances (PFASs) in wastewaters from an industrial facility dedicated to the production of side-chain-fluorinated polymers and fluorotelomer-based products for fire-fighting foams. 6:2 fluorotelomer sulfonamide alkylbetaine (6:2 FTAB, 1111 ?g/L), 6:2 fluorotelomer sulfonic acid (6:2 FTSA, 242.5 ?g/L) and 6:2 fluorotelomer sulfonamide propyl N,N dimethylamine (M4, 34.4 ?g/L) were the most abundant PFASs in the industrial wastewater, that also contained perfluorocarboxylic acids (?PFCAs, 12.2 ?g/L), high TOC and chloride as main anion. 2 L samples were treated in bench scale experiments performed at a current density of 50 mA/cm2, in a commercial cell equipped with a boron doped diamond (BDD) anode (70 cm2). 97.1% of the initial PFASs content was removed after 8 h of electrochemical treatment. Furthermore, the TOC removal (82.5%) and the fluoride release confirmed the PFASs mineralization. Based on the evolution of the different PFASs, electrochemical degradation pathways were proposed. Fluorotelomers sulfonamides 6:2 FTAB and M4 would be degraded into 6:2 FTSA, which conversely would give rise to PFHpA and preferentially PFHxA. The latter PFCAs were transformed into shorter-chain PFCAs, and eventually into CO2 and fluoride. The reported results support the technical viability of BDD electrooxidation for the treatment of PFASs in industrial wastewater.

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 Autoría: Gomez-Ruiz B., Gómez-Lavín S., Diban N., Boiteux V., Colin A., Dauchy X., Urtiaga A.,

 Fuente: Journal of Electroanalytical Chemistry, 2017, 798, 51-57

Editorial: Elsevier Sequoia

 Fecha de publicación: 01/08/2017

Nº de páginas: 35

Tipo de publicación: Artículo de Revista

DOI: 10.1016/j.jelechem.2017.05.033

ISSN: 0368-1874,1572-6657

Proyecto español: CTM2013-44081-R ; CTM2016-75509-R

Url de la publicación: https://doi.org/10.1016/j.jelechem.2017.05.033