Authors Asquith, B. M. ; Meier-Haack, J. ; Vogel, C. ; Butwilowski, W. ; Ladewig, B. P.
Title Side-chain sulfonated copolymer cation exchange membranes for electro-driven desalination applications
Date 04.07.2013
Number 38804
Abstract Cation exchange membranes prepared from random and multiblock side-chain sulfonated poly(ether sulfone)s have been characterised to evaluate their suitability for electrodialysis and membrane capacitive deionization applications. The side chain sulfonation of the copolymers resulted in membranes with a high degree of sulfonation and ion exchange capacities (IEC) in the range of 1.44–2.05 mmol/g, which is comparable to commercially available membranes. The multiblock copolymer, which can be considered as having a microheterogeneous structure, exhibited a high IEC and water uptake due to large, hydrophilic domains, while the random copolymers had lower swelling rates. Membrane conductivity in the Na+ form reached as high as 15.13 mS/cm for the random copolymers and 16.74 mS/cm for the block copolymer. Transport numbers were found to be as high as 0.99 for random copolymers, but as low as 0.84 for the block copolymer. Based on these results, these side-chain sulfonated random copolymers are potential candidates for use in electro-driven desalination systems.
Publisher Desalination
Citation Desalination 324 (2013) 93-98
Tags cation exchange membranes copolymers side-chain sulfonation electrodialysis membrane capacitive deionization capacitive deionization poly(ether sulfone)s water electrodialysis polymers energy

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