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Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution
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Highlights PFOA degradation follows both pseudo-zero-order and pseudo-first-order kinetics. The k PFOA values increase by 3.84 times via PMS activation. SO4 •− from PMS activation enhances the yield of •OH. PMS addition increases the oxygen evolution potential of Ti/SnO2-Sb. Both •OH and SO4 •− contribute to PFOA oxidation.
Abstract 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 •−.
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution
Graphical abstract Display Omitted
Highlights PFOA degradation follows both pseudo-zero-order and pseudo-first-order kinetics. The k PFOA values increase by 3.84 times via PMS activation. SO4 •− from PMS activation enhances the yield of •OH. PMS addition increases the oxygen evolution potential of Ti/SnO2-Sb. Both •OH and SO4 •− contribute to PFOA oxidation.
Abstract 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 •−.
Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution
Wang, Kaixuan (author) / Huang, Dahong (author) / Wang, Weilai (author) / Ji, Yangyuan (author) / Niu, Junfeng (author)
2020-02-07
Article (Journal)
Electronic Resource
English
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