Abstract
A facile approach has been chosen for the synthesis of PVDF based copolymer anion exchange membrane using nonhazardous chemicals. The synthetic route was achieved through free radical polymerization between dehydrofluorinated PVDF-co-HFP (DYPVDF) and morpholine functionalized vinyl benzyl chloride (VBC). The variations in properties of formed membranes were evaluated by varying the concentration of VBC. FT-IR, as well as 1H NMR, confirms the formation of the desired molecular structure of copolymer in form of a membrane. Surface morphology of copolymer anion exchange membranes was checked through TEM and AFM analysis. Standardized techniques were used to evaluate the physicochemical and electrochemical properties of the membranes like ion exchange capacity (IEC), water uptake (WU), ionic conductivity (IC) and linear expansion ratio (LER). The highest value of water uptake and IEC was found to be 28% and 1.27 meq/g for PQM-40 copolymer anion exchange membrane. Membranes were subjected to Fenton's test to evaluate their oxidative stability. Maximum weight loss of 1.67%, 1.44% and 1.39% was found in PQM-40, PQM-30, and PQM-20 respectively. Further, synthesized copolymer membranes were subjected to salt removal by electrodialysis and acid recovery by diffusion dialysis (DD). Maximum current efficiency during desalination and highest separation factor for acid recovery by diffusion dialysis were confirmed by PQM-40, the values are 82.36% and 25% respectively.
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