Abstract
Anion exchange membranes are highly versatile and nowadays have many applications, ranging from water treatment to sensing materials. The preparation of anion exchange membranes (AEMs) from brominated poly(2,6-dimethyl-1,6-phenylene oxide) (BPPO) and methyl(diphenyl)phosphine (MDPP) for electrodialysis was performed. The physiochemical properties and electrochemical performance of fabricated membranes can be measured by changing MDPP contents in the membrane matrix. The influence of a quaternary phosphonium group associated with the removal of NaCl from water is discussed. The prepared membranes have ion exchange capacities (IEC) 1.09–1.52 mmol/g, water uptake (WR) 17.14%–21.77%, linear expansion ratio (LER) 7.96%–11.86%, tensile strength (TS) 16.66–23.97 MPa and elongation at break (Eb) 485.57%–647.98%. The prepared anion exchange membranes were employed for the electrodialytic removal of 0.1 M NaCl aqueous solution at a constant applied voltage. It is found that the reported membranes could be the promising candidate for NaCl removal via electrodialysis.
Highlights
Ion exchange membranes (IEM) have been extensively investigated in the past century [1], attracting both commercial and academic interests in water treatment and energy conversion processes [2]
The adsorption peaks for symmetrical and asymmetrical stretching vibration of C–O are at 1200 cm1 and 1306 cm1, and for phenyl groups are at 1470 cm1 and 1600 cm1
The attachment of quaternary phosphonium group in the composite membrane was confirmed by the appearance of two characteristic bands at 900 cm1 and 1100 cm1
Summary
Ion exchange membranes (IEM) have been extensively investigated in the past century [1], attracting both commercial and academic interests in water treatment and energy conversion processes [2] They can be employed in electrodialysis (ED) to concentrate or deionize aqueous electrolyte solutions [3,4] and in diffusion dialysis to recover acid or alkali from waste acid or alkali solutions [5]. They can detach acidic gas via carrier transport [6,7,8], act as solid electrolytes in fuel cells [9,10] and behave as sensing materials in sensors [11].
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