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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.



Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 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

Autores/as

BEATRIZ GOMEZ RUIZ
SONIA GOMEZ LAVIN
BOITEUX, VIRGINIE
COLIN, ADELINE
DAUCHY, XAVIER