文献类型：期刊文献

英文题名：Rapid removal of PFOA and PFOS via modified industrial solid waste: Mechanisms and influences of water matrices

作者：Wan, Hongyi[1,2];Mills, Rollie C.[2];Qu, Kai[1];Hower, James[3];Mottaleb, M. Abdul[4,5];Bhattacharyya, Dibakar[2];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA;[3]Univ Kentucky, Ctr Appl Energy Res, Lexington, KY 40503 USA;[4]Univ Kentucky, Dept Earth & Environm Sci, Lexington, KY 40506 USA;[5]St Louis Univ, Doisy Res Ctr, Inst Drug & Biotherapeut Innovat IDBI, St Louis, MO 63104 USA

年份：2022

卷号：433

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20214611179673);WOS:【SCI-EXPANDED(收录号:WOS:000773065300002)】；

基金：This work was supported by China Postdoctoral Science Foundation [2020M681204]; the National Natural Science Foundation of China [21908054 & 22075076]; and NIEHS-SRP grant [P42ES007380] . We highly appreciate the collaborations with the UK superfund center and the UK CAER

语种：英文

外文关键词：PFAS removal; Rapid adsorption; Fly ash; Co-existing competitors; Quaternary ammonium

摘要：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 (t(eq) = 2 min) of PFOX (perfluorooctanoic acid and perfluorooctanesulfonic acid, collectively), where the dynamic adsorption capacity (q(dyn) = q(m)/t(eq)) 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 q(dyn) are attributed to (1) elevated external diffusion driven by the submicron particle size; (2) enhanced intraparticle diffusion caused by the developed mesoporous structure (V-meso/V-micro = 8.1); (3) numerous quaternary ammonium anion-exchange sites (840 mu mol/g), and (4) appropriate adsorption affinity (0.031 L/mu mol for PFOS, and 0.023 L/mu mol for PFOA). Since the adsorption was proven to be a synergistic process of electrostatic and hydrophobic interactions, effective adsorption ([PFOX](ini) = 1.21 mu M, 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 ?degrees C). Overall, FA-SCA showed no leaching issues of toxic metals and exhibits great potential in both single-adsorption processes and treatment train systems.