Degradation of perfluorooctane sulfonate via in situ electro-generated ferrate and permanganate oxidants in NOM-rich source waters
| Autor: | Nigel Graham, Sean T. McBeath |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Flocculation
Technology VALENT IRON Environmental Engineering 0207 environmental engineering chemistry.chemical_element Environmental Sciences & Ecology 02 engineering and technology Manganese 010501 environmental sciences Electrochemistry 01 natural sciences 0905 Civil Engineering law.invention chemistry.chemical_compound Engineering law PFOS NANOSCALE IRON PARTICLES POLYCHLORINATED-BIPHENYLS DECHLORINATION 0399 Other Chemical Sciences DOPED-DIAMOND 020701 environmental engineering 0105 earth and related environmental sciences Water Science and Technology Electrolysis Aqueous solution Science & Technology ELECTROCHEMICAL OXIDATION TREATMENT TECHNOLOGIES Permanganate Engineering Environmental 6. Clean water 0907 Environmental Engineering Sulfonate chemistry PERFLUORINATED COMPOUNDS 13. Climate action Physical Sciences Water Resources Water treatment Life Sciences & Biomedicine Environmental Sciences Nuclear chemistry ANODIC-OXIDATION |
| Popis: | A novel process involving the in situ electrochemical generation of ferrate and permanganate oxidants, in circumneutral conditions, from low concentration aqueous iron (Fe2+) and manganese (Mn2+), is investigated for the treatment of the ubiquitous and highly recalcitrant micro-pollutant, perfluorooctane sulfonate (PFOS). The present study investigated the efficacy of both electro-oxidation (EO), and the simultaneous EO and ferrate/permanganate generation and oxidation, of PFOS as a potential drinking water treatment technology. While permanganate was shown to have little effect on PFOS removal, significantly increased degradation was observed when EO was coupled with ferrate generation and oxidation, significantly exceeding that of solely EO. From an initial concentration of 0.80 μM, final PFOS concentrations of 0.53 (±0.004), 0.43 (±0.01) and 0.27 (±0.01) μM were yielded during 10, 40 and 80 mA cm−2 electrolysis and an initial Fe2+ = 179 μM. In general, PFOS degradation rates increased with both increasing current density and initial Fe2+ concentration. Degradation was observed to follow mixed zero- and pseudo-first-order reaction kinetics for both the EO and simultaneous EO and ferrate oxidation. Finally, PFOS oxidation was not inhibited by the presence of low and high molecular weight organic scavenger species, and high concentrations of natural organic matter (NOM) improved PFOS removal due to hydrophobic interaction. Reduced ferrate species were also observed to increase NOM removal after electrolysis, by iron coagulant formation and subsequent flocculation. |
| Databáze: | OpenAIRE |
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