Removal of calcium ions from water by selective electrosorption using target-ion specific nanocomposite electrode

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dc.citation.firstpage445
dc.citation.journalTitleWater Research
dc.citation.lastpage453
dc.citation.volumeNumber160
dc.contributor.authorKim, Jun
dc.contributor.authorJain, Amit
dc.contributor.authorZuo, Kuichang
dc.contributor.authorVerduzco, Rafael
dc.contributor.authorWalker, Shane
dc.contributor.authorElimelech, Menachem
dc.contributor.authorZhang, Zhenghua
dc.contributor.authorZhang, Xihui
dc.contributor.authorLi, Qilin
dc.contributor.orgNanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment
dc.date.accessioned2019-08-16T16:07:50Z
dc.date.available2019-08-16T16:07:50Z
dc.date.issued2019
dc.description.abstractTechnologies capable of selective removal of target contaminants from water are highly desirable to achieve “fit-for-purpose” treatment. In this study, we developed a simple yet highly effective method to achieve calcium-selective removal in an electrosorption process by coating the cathode with a calcium-selective nanocomposite (CSN) layer using an aqueous phase process. The CSN coating consisted of nano-sized calcium chelating resins with aminophosphonic groups in a sulfonated polyvinyl alcohol hydrogel matrix, which accomplished a Ca2+-over-Na+selectivity of 3.5–5.4 at Na+:Ca2+ equivalent concentration ratio from 10:1 to 1:1, 94 – 184% greater than the uncoated electrode. The CSN coated electrode exhibited complete reversibility in repeated operation. Mechanistic studies suggested that the CSN coating did not contribute to the adsorption capacity, but rather allowed preferential permeation of Ca2+ and hence increased Ca2+ adsorption on the carbon cathode. The CSN-coated electrode was very stable, showing reproducible performance in 60 repeated cycles.
dc.identifier.citationKim, Jun, Jain, Amit, Zuo, Kuichang, et al.. "Removal of calcium ions from water by selective electrosorption using target-ion specific nanocomposite electrode." <i>Water Research,</i> 160, (2019) Elsevier: 445-453. https://doi.org/10.1016/j.watres.2019.05.016.
dc.identifier.doihttps://doi.org/10.1016/j.watres.2019.05.016
dc.identifier.urihttps://hdl.handle.net/1911/106261
dc.language.isoeng
dc.publisherElsevier
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier.
dc.subject.keywordCalcium-selective removal
dc.subject.keywordCapacitive deionization
dc.subject.keywordDesalination
dc.subject.keywordElectrosorption
dc.subject.keywordNanocomposite coating
dc.titleRemoval of calcium ions from water by selective electrosorption using target-ion specific nanocomposite electrode
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpost-print
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