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

Willson, Terry R., Hamerton, Ian, Varcoe, John R. and Bance-Soualhi, Rachida (2019) Radiation-grafted cation-exchange membranes: an initial ex situ feasibility study into their potential use in reverse electrodialysis Sustainable Energy & Fuels, 2019 (3). pp. 1682-1692.

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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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Willson, Terry R.trwillson@surrey.ac.uk
Hamerton, IanI.Hamerton@surrey.ac.uk
Varcoe, John R.J.Varcoe@surrey.ac.uk
Bance-Soualhi, Rachidar.bance-soualhi@surrey.ac.uk
Date : 1 July 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC), University of Surrey
DOI : 10.1039/C8SE00579F
Copyright Disclaimer : © The Royal Society of Chemistry 2019.
Depositing User : Clive Harris
Date Deposited : 23 May 2019 12:41
Last Modified : 02 Jul 2019 09:46
URI: http://epubs.surrey.ac.uk/id/eprint/851882

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