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Radiation-grafted cation-exchange membranes: an initial ex situ feasibility study into their potential use in reverse electrodialysis

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)1682-1692
Number of pages11
JournalSustainable Energy and Fuels
Volume3
Issue number7
Early online date14 May 2019
DateAccepted/In press - 14 May 2019
DateE-pub ahead of print - 14 May 2019
DatePublished (current) - 1 Jul 2019

Abstract

A variety of radiation-grafted cation-exchange membranes (RG-CEM) were synthesised, using a high-dose rate electron-beam peroxidation method, for an initial evaluation of their applicability to reverse electrodialysis cells (RED, a type of salinity gradient “blue” energy). The RG-CEMs were adequately conductive (to Na+ cations) but without the incorporation of crosslinking co-monomers, the permselectivities were too low (≤80%). In contrast, when ETFE-based RG-CEMs were synthesised with incorporation of 10% mol bis(vinylphenyl)ethane (BVPE) crosslinking co-monomer into the styrene-containing grafting mixture, permselectivities of >90% were obtained without a significant decrease in conductivity. The use of BVPE in the grafting mixture also resulted in the RG-CEMs exhibiting enhanced ion-exchange capacities without any increase in water uptakes (cf. uncrosslinked variants). In contrast, the use of less flexible divinylbenzene crosslinker led to prohibitively large decreases in RG-CEM conductivity. This study highlights that the future development of both radiation-grafted cation-exchange and anion-exchange membranes for RED (and other electrodialysis applications) should utilise flexible crosslinkers (such as BVPE) to ensure adequate permselectivities.

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  • Bristol Composites Institute ACCIS

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://pubs.rsc.org/en/content/articlelanding/2019/se/c8se00579f#!divAbstract. Please refer to any applicable terms of use of the publisher.

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  • Supplementary information PDF

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://pubs.rsc.org/en/content/articlelanding/2019/se/c8se00579f#!divAbstract. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 2 MB, PDF document

    Embargo ends: 14/05/20

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