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• W3208589775 endingPage "133271" @default.
• W3208589775 startingPage "133271" @default.
• W3208589775 abstract "Emerging perfluoroalkyl and polyfluoroalkyl substances contaminate waters at trace concentrations, thus rapid and selective adsorbents are pivotal to mitigate the consequent energy-intensive and time-consuming issues in remediation. In this study, coal combustion residuals-fly ash was modified (FA-SCA) to overcome the universal trade-off between high adsorption capacity and fast kinetics. FA-SCA presented rapid adsorption (teq = 2 min) of PFOX (perfluorooctanoic acid and perfluorooctanesulfonic acid, collectively), where the dynamic adsorption capacity (qdyn = qm/teq) was 2–3 orders of magnitude higher than that of benchmark activated carbons and anion-exchange resins. Investigated by advanced characterization and kinetic models, the fast kinetics and superior qdyn are attributed to (1) elevated external diffusion driven by the submicron particle size; (2) enhanced intraparticle diffusion caused by the developed mesoporous structure (Vmeso/Vmicro = 8.1); (3) numerous quaternary ammonium anion-exchange sites (840 µmol/g), and (4) appropriate adsorption affinity (0.031 L/µmol for PFOS, and 0.023 L/µmol for PFOA). Since the adsorption was proven to be a synergistic process of electrostatic and hydrophobic interactions, effective adsorption ([PFOX]ini = 1.21 µM, concentration levels of highly-contaminant-sites) was obtained at conventional natural water chemistries. High selectivity (>85.4% removal) was also achieved with organic/inorganic competitors, especially compounds with partly similar molecular structures to PFOX. In addition, >90% PFOX was removed consistently during five cycles in mild regeneration conditions (pH 12 and 50 °C). Overall, FA-SCA showed no leaching issues of toxic metals and exhibits great potential in both single-adsorption processes and treatment train systems." @default.
• W3208589775 created "2021-11-08" @default.
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• W3208589775 date "2022-04-01" @default.
• W3208589775 modified "2023-10-15" @default.
• W3208589775 title "Rapid removal of PFOA and PFOS via modified industrial solid waste: Mechanisms and influences of water matrices" @default.
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• W3208589775 doi "https://doi.org/10.1016/j.cej.2021.133271" @default.
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• W3208589775 hasPublicationYear "2022" @default.
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