Selective removal of divalent cations by polyelectrolyte multilayer nanofiltration membrane: Role of polyelectrolyte charge, ion size, and ionic strength

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dc.citation.firstpage98en_US
dc.citation.journalTitleJournal of Membrane Scienceen_US
dc.citation.lastpage106en_US
dc.citation.volumeNumber559en_US
dc.contributor.authorCheng, Weien_US
dc.contributor.authorLiu, Caihongen_US
dc.contributor.authorTong, Tiezhengen_US
dc.contributor.authorEpsztein, Razien_US
dc.contributor.authorSun, Mengen_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.contributor.authorMa, Junen_US
dc.contributor.authorElimelech, Menachemen_US
dc.contributor.orgNanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatmenten_US
dc.date.accessioned2018-10-31T18:20:48Zen_US
dc.date.available2018-10-31T18:20:48Zen_US
dc.date.issued2018en_US
dc.description.abstractWe fabricatedﾠpolyelectrolyteﾠmultilayerﾠ(PEM)ﾠnanofiltrationﾠ(NF) membranes using a layer-by-layer (LbL) method for effective removal of scale-forming divalent cations (Mg2+, Ca2+, Sr2+, and Ba2+) from feedwaters with different salinities. Twoﾠpolymersﾠwith opposite charges, polycation (poly(diallyldimethylammonium chloride), PDADMAC) and polyanion (poly(sodium 4-styrenesulfonate), PSS), were sequentially deposited on a commercialﾠpolyamideﾠNF membrane to form a PEM. Compared to pristine and PSS-terminated membranes, PDADMAC-terminated membranes demonstrated much higher rejection of divalent cations and selectivity forﾠsodiumﾠtransport over divalent cations (Na+/X2+) due to a combination of both Donnan- and size-exclusion effects. A PDADMAC-terminated membrane with 5.5 bilayers exhibited 97% rejection of Mg2+ﾠwith selectivity (Na+/Mg2+) greater than 30. We attribute the order of cation rejection (Mg2+ﾠ> Ca2+ﾠ> Sr2+ﾠ> Ba2+) to the ionic size, which governs both the hydration radius and hydration energy of the cations. The ionic strength (salinity) of the feed solution had a significant influence on both water flux and cation rejection of PEM membranes. In feed solutions with high ionic strength, abundant NaCl salt screened the charge of the polyelectrolytes and led to swelling of the multilayers, resulting in decreased selectivity (Na+/X2+) and increased water permeability. The fabricated PEM membranes can be potentially applied to the pretreatment of mild-salinity brackish waters to reduce membrane scaling in the mainﾠdesalinationﾠstage.en_US
dc.identifier.citationCheng, Wei, Liu, Caihong, Tong, Tiezheng, et al.. "Selective removal of divalent cations by polyelectrolyte multilayer nanofiltration membrane: Role of polyelectrolyte charge, ion size, and ionic strength." <i>Journal of Membrane Science,</i> 559, (2018) Elsevier: 98-106. https://doi.org/10.1016/j.memsci.2018.04.052.en_US
dc.identifier.doihttps://doi.org/10.1016/j.memsci.2018.04.052en_US
dc.identifier.urihttps://hdl.handle.net/1911/103249en_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.keywordNanofiltrationen_US
dc.subject.keywordPolyelectrolyte multilayeren_US
dc.subject.keywordDivalent cation removalen_US
dc.subject.keywordIonic strengthen_US
dc.subject.keywordScaling controlen_US
dc.titleSelective removal of divalent cations by polyelectrolyte multilayer nanofiltration membrane: Role of polyelectrolyte charge, ion size, and ionic strengthen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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