Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution
Perfluorooctanoic acid (PFOA) was efficiently decomposed at Ti/SnO2-Sb anode via peroxymonosulfate (PMS) activation. PFOA degradation followed both pseudo-zero-order (0–30 min) and pseudo-first-order (30–120 min) kinetics. The pseudo-first-order kinetics constant could increase to 0.0484 min−1 (3.84...
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doaj-90a6c684b5a74ae9b57f71eeade25be82020-11-25T02:38:27ZengElsevierEnvironment International0160-41202020-04-01137Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solutionKaixuan Wang0Dahong Huang1Weilai Wang2Yangyuan Ji3Junfeng Niu4State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR ChinaResearch Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR ChinaResearch Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR China; Corresponding author.Perfluorooctanoic acid (PFOA) was efficiently decomposed at Ti/SnO2-Sb anode via peroxymonosulfate (PMS) activation. PFOA degradation followed both pseudo-zero-order (0–30 min) and pseudo-first-order (30–120 min) kinetics. The pseudo-first-order kinetics constant could increase to 0.0484 min−1 (3.84 times higher than that without PMS) during 30–120 min electrolysis. The inhibited performance in radical scavengers implied both sulfate radical (SO4•−) and hydroxyl radical (•OH) contributed to PFOA degradation. The •OH quantitative detection experiments demonstrated that SO4•− formed from PMS activation could promote •OH generation (from 0.12 mM to 0.24 mM). Electron spin resonance (ESR) tests further proved that SO4•− and •OH were generated during PFOA degradation. According to linear sweep voltammetry (LSV) analyses, the oxygen evolution potential (OEP) value of Ti/SnO2-Sb electrode increased from 1.59 V to 1.72 V (vs SCE) via PMS addition, indicating the inhibited oxygen evolution which was beneficial for the reactive species formation (i.e. •OH, SO4•−). On the basis of intermediates verification and mass balance of carbon and fluorine, PFOA was proposed to be oxidized into short-chain perfluorocarboxylic acids mainly by •OH and SO4•−. Keywords: Perfluorooctanoic acid, Peroxymonosulfate activation, Hydroxyl radical, Sulfate radicalhttp://www.sciencedirect.com/science/article/pii/S016041201933764X |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kaixuan Wang Dahong Huang Weilai Wang Yangyuan Ji Junfeng Niu |
spellingShingle |
Kaixuan Wang Dahong Huang Weilai Wang Yangyuan Ji Junfeng Niu Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution Environment International |
author_facet |
Kaixuan Wang Dahong Huang Weilai Wang Yangyuan Ji Junfeng Niu |
author_sort |
Kaixuan Wang |
title |
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution |
title_short |
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution |
title_full |
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution |
title_fullStr |
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution |
title_full_unstemmed |
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution |
title_sort |
enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution |
publisher |
Elsevier |
series |
Environment International |
issn |
0160-4120 |
publishDate |
2020-04-01 |
description |
Perfluorooctanoic acid (PFOA) was efficiently decomposed at Ti/SnO2-Sb anode via peroxymonosulfate (PMS) activation. PFOA degradation followed both pseudo-zero-order (0–30 min) and pseudo-first-order (30–120 min) kinetics. The pseudo-first-order kinetics constant could increase to 0.0484 min−1 (3.84 times higher than that without PMS) during 30–120 min electrolysis. The inhibited performance in radical scavengers implied both sulfate radical (SO4•−) and hydroxyl radical (•OH) contributed to PFOA degradation. The •OH quantitative detection experiments demonstrated that SO4•− formed from PMS activation could promote •OH generation (from 0.12 mM to 0.24 mM). Electron spin resonance (ESR) tests further proved that SO4•− and •OH were generated during PFOA degradation. According to linear sweep voltammetry (LSV) analyses, the oxygen evolution potential (OEP) value of Ti/SnO2-Sb electrode increased from 1.59 V to 1.72 V (vs SCE) via PMS addition, indicating the inhibited oxygen evolution which was beneficial for the reactive species formation (i.e. •OH, SO4•−). On the basis of intermediates verification and mass balance of carbon and fluorine, PFOA was proposed to be oxidized into short-chain perfluorocarboxylic acids mainly by •OH and SO4•−. Keywords: Perfluorooctanoic acid, Peroxymonosulfate activation, Hydroxyl radical, Sulfate radical |
url |
http://www.sciencedirect.com/science/article/pii/S016041201933764X |
work_keys_str_mv |
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