Sulfonated polymer coating enhances selective removal of calcium in membrane capacitive deionization

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dc.citation.articleNumber120974en_US
dc.citation.journalTitleJournal of Membrane Scienceen_US
dc.citation.volumeNumber662en_US
dc.contributor.authorNnorom, Njideka C.en_US
dc.contributor.authorRogers, Tanyaen_US
dc.contributor.authorJain, Amiten_US
dc.contributor.authorAlazmi, Abdullahen_US
dc.contributor.authorElias, Welman Curien_US
dc.contributor.authorDuChanois, Ryan M.en_US
dc.contributor.authorFlores, Kenneth R.en_US
dc.contributor.authorGardea-Torresdey, Jorge L.en_US
dc.contributor.authorCokar, Maryaen_US
dc.contributor.authorElimelech, Menachemen_US
dc.contributor.authorWong, Michael S.en_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.contributor.orgNSF Nanosystems Engineering Research Center, Nanotechnology-Enabled Water Treatmenten_US
dc.date.accessioned2022-11-03T14:38:39Zen_US
dc.date.available2022-11-03T14:38:39Zen_US
dc.date.issued2022en_US
dc.description.abstractThere is a need for membranes and processes that can selectively separate target ions from other similar ionic species. Recent studies have shown that electrified processes for ion removal such as membrane capacitive deionization (MCDI) and electrodialysis (ED) are selective towards specific ionic species, but selectivities are generally limited. Here, we demonstrate that an ion-selective polymer coating can significantly enhance ion selectivities for MCDI processes. We focused on the preferential removal of Ca2+ over Na+ and used the conductive and sulfonated polymer poly(3,4-ethylene dioxythiophene):polystyrene sulfonate (PEDOT:PSS) as a model selective ion-exchange coating. We first measured the permeability of Ca2+ and Na+ in freestanding PEDOT:PSS membranes of varying crosslink density and found that the permeability of Ca2+ was six times greater than that for Na+ in optimized membranes. Next, we used PEDOT:PSS in an MCDI process by depositing thin PEDOT:PSS coatings on top of composite electrodes. We found that the PEDOT:PSS coatings significantly enhanced the preferential permeability of Ca2+ over Na + relative to unmodified electrodes and produced a preferential removal as high as 8:1 on a molar basis. This work demonstrates a new approach to enhance selective ion removal in MCDI and other electro-driven ion separation processes.en_US
dc.identifier.citationNnorom, Njideka C., Rogers, Tanya, Jain, Amit, et al.. "Sulfonated polymer coating enhances selective removal of calcium in membrane capacitive deionization." <i>Journal of Membrane Science,</i> 662, (2022) Elsevier: https://doi.org/10.1016/j.memsci.2022.120974.en_US
dc.identifier.doihttps://doi.org/10.1016/j.memsci.2022.120974en_US
dc.identifier.urihttps://hdl.handle.net/1911/113793en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier.en_US
dc.subject.keywordMembranesen_US
dc.subject.keywordDesalinationen_US
dc.subject.keywordCapacitive deionizationen_US
dc.subject.keywordIon transporten_US
dc.subject.keywordPolymersen_US
dc.titleSulfonated polymer coating enhances selective removal of calcium in membrane capacitive deionizationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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