Self assembled, sulfonated pentablock copolymer cation exchange coatings for membrane capacitive deionization

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dc.citation.firstpage348en_US
dc.citation.journalTitleMSDEen_US
dc.citation.lastpage356en_US
dc.citation.volumeNumber4en_US
dc.contributor.authorJain, Amiten_US
dc.contributor.authorWeathers, Cierraen_US
dc.contributor.authorKim, Junen_US
dc.contributor.authorMeyer, Matthew D.en_US
dc.contributor.authorWalker, W. Shaneen_US
dc.contributor.authorLi, Qilinen_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.contributor.orgNanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatmenten_US
dc.date.accessioned2019-08-16T16:07:51Zen_US
dc.date.available2019-08-16T16:07:51Zen_US
dc.date.issued2019en_US
dc.description.abstractMembrane capacitive deionization (MCDI) is a simple and low-cost method for brackish water desalination involving reversible electrosorption using high surface area, porous electrodes paired with ion-exchange membranes. Ion-exchange membranes improve charge efficiency and salt adsorption capacity by limiting the transport of co-ions and inhibiting faradaic reactions at the electrode surface. Effective ion-exchange membranes for MCDI should have high permselectivity and low ionic resistance, but there is typically a trade-off between these two properties. In this work, we studied partially sulfonated pentablock copolymer (sPBC) as a cation-exchange coating for MCDI electrodes. sPBC ion exchange coatings of varying ion exchange capacity (IEC, 1.0, 1.5, 2.0 meq gāˆ’1) and a range of casting solvent compositions (10ā€“60 wt% n-propanol in toluene) were prepared. Transmission electron microscopy analysis of the membranes showed a morphological change from a micellar to lamellar and then to an inverse micellar structure with increasing polarity of the casting solvent. Water uptake and salt permeability increased with increasing IEC and casting solvent polarity over the entire range of conditions tested. MCDI device studies indicated that charge efficiency and salt adsorption capacity both increased with water uptake over a range of casting solvent compositions due to morphological changes in the sPBC film. This work demonstrates an effective solution-processible ion-exchange layer for MCDI using a self-assembling block copolymer and suggests that ideal ion-exchange coatings for MCDI should have high water uptake to minimize ionic resistance while at the same time maintaining a high charge density of fixed charged groups to achieve high permselectivity.en_US
dc.identifier.citationJain, Amit, Weathers, Cierra, Kim, Jun, et al.. "Self assembled, sulfonated pentablock copolymer cation exchange coatings for membrane capacitive deionization." <i>MSDE,</i> 4, (2019) Royal Society of Chemistry: 348-356. https://doi.org/10.1039/C8ME00115D.en_US
dc.identifier.doihttps://doi.org/10.1039/C8ME00115Den_US
dc.identifier.urihttps://hdl.handle.net/1911/106264en_US
dc.language.isoengen_US
dc.publisherRoyal Society of Chemistryen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the Royal Society of Chemistry.en_US
dc.titleSelf assembled, sulfonated pentablock copolymer cation exchange coatings for membrane capacitive deionizationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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