Precise Cation Separations with Composite Cation-Exchange Membranes: Role of Base Layer Properties

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dc.citation.firstpage6331en_US
dc.citation.issueNumber15en_US
dc.citation.journalTitleEnvironmental Science & Technologyen_US
dc.citation.lastpage6341en_US
dc.citation.volumeNumber57en_US
dc.contributor.authorDuChanois, Ryan M.en_US
dc.contributor.authorMazurowski, Laurenen_US
dc.contributor.authorFan, Hanqingen_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.contributor.authorNir, Odeden_US
dc.contributor.authorElimelech, Menachemen_US
dc.contributor.orgNanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT)en_US
dc.date.accessioned2023-05-02T18:37:01Zen_US
dc.date.available2023-05-02T18:37:01Zen_US
dc.date.issued2023en_US
dc.description.abstractSeparation of specific ions from water could enable recovery and reuse of essential metals and nutrients, but established membrane technologies lack the high-precision selectivity needed to facilitate a circular resource economy. In this work, we investigate whether the cation/cation selectivity of a composite cation-exchange membrane (CEM), or a thin polymer selective layer on top of a CEM, may be limited by the mass transfer resistance of the underlying CEM. In our analysis, we utilize a layer-by-layer technique to modify CEMs with a thin polymer selective layer (∼50 nm) that has previously shown high selectivity toward copper over similarly sized metals. While these composite membranes have a CuCl2/MgCl2 selectivity up to 33 times larger than unmodified CEMs in diffusion dialysis, our estimates suggest that eliminating resistance from the underlying CEM could further increase selectivity twofold. In contrast, the CEM base layer has a smaller effect on the selectivity of these composite membranes in electrodialysis, although these effects could become more pronounced for ultrathin or highly conductive selective layers. Our results highlight that base layer resistance prevents selectivity factors from being comparable across diffusion dialysis and electrodialysis, and CEMs with low resistance are necessary for providing highly precise separations with composite CEMs.en_US
dc.identifier.citationDuChanois, Ryan M., Mazurowski, Lauren, Fan, Hanqing, et al.. "Precise Cation Separations with Composite Cation-Exchange Membranes: Role of Base Layer Properties." <i>Environmental Science & Technology,</i> 57, no. 15 (2023) American Chemical Society: 6331-6341. https://doi.org/10.1021/acs.est.3c00445.en_US
dc.identifier.doihttps://doi.org/10.1021/acs.est.3c00445en_US
dc.identifier.urihttps://hdl.handle.net/1911/114869en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.en_US
dc.titlePrecise Cation Separations with Composite Cation-Exchange Membranes: Role of Base Layer Propertiesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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