Electrochemical degradation of per- and poly-fluoroalkyl substances using boron-doped diamond electrodes

• DOI: 10.1016/j.jenvman.2021.112573
• Publication Date: 2021-04-16T23:40:46Z
• Authors: Jean Noel Uwayezu; Ivan Carabante; Tore Lejon; Patrick van Hees; Patrik Karlsson; Patrik Hollman; Jurate Kumpiene
• Keywords: Perfluorooctanoic acid; Degradation; Supporting electrolyte

Electrochemical degradation using boron-doped diamond (BDD) electrodes has been proven to be a promising technique for the treatment of water contaminated with per- and poly-fluoroalkyl substances (PFAS). Various studies have demonstrated that extent PFAS is influenced by composition samples electrochemical conditions. This study evaluated significance several factors, such as current density, initial concentration PFAS, electrolyte, time, their interactions on PFAS. A 24 factorial design was applied determine effects investigated factors perfluorooctanoic acid (PFOA) generation fluoride in spiked water. The best-performing conditions were then wastewater samples. results revealed density time most important PFOA degradation. In contrast, high electrolyte had no significant impact PFOA, whereas it decreased F−. experimental model indicated under higher than 14 mA cm−2 3–4 h could degrade an efficiency up 100% generate F− fraction approximately 40–50%. observed low products mineralization effective. Under obtained best conditions, 44–70%. other these 65–80% perfluorooctane sulfonic (PFOS) 42–52% 6–2 fluorotelomer sulfonate (6-2 FTSA). presence total organic carbon (TOC) chloride contents found factor affecting indicates tested method can effectively both suggests increasing needed account oxidizable matrices.