Abstract
Ion-exchange membranes are the core elements for an electrodialysis (ED) separation process. Phase inversion is an effective method, particularly for commercial membrane production. It introduces two different mechanisms, i.e., thermal induced phase separation (TIPS) and diffusion induced phase separation (DIPS). In this study, anion exchange membranes (AEMs) were prepared by grafting a quaternized moiety (QM,2-[dimethylaminomethyl]naphthalen-1-ol) through brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) via the TIPS method. Those membranes were applied for selective bisulfite (HSO3−) anion separation using ED. The membrane surface morphology was characterized by SEM, and the compositions were magnified using a high-resolution transmission electron microscope (HRTEM). Notably, the membranes showed excellent substance stability in an alkali medium and in grafting tests performed in a QM-soluble solvent. The ED experiment indicated that the as-prepared membrane exhibited better HSO3− separation performance than the state-of-the-art commercial Neosepta AMX (ASTOM, Japan) membrane.
Highlights
Open-ended distinct characters of membranes have been considered and adopted in industrial uses
An innovative anion exchange membranes (AEMs) was successfully prepared with BPPO and quaternized moiety (QM), applying the thermal induced phase separation (TIPS) technique by grafting through copolymerization
The diffusion induced phase separation (DIPS) test was used to test the conduction of a QM-soluble solvent and showed excellent grafting
Summary
Open-ended distinct characters of membranes have been considered and adopted in industrial uses. Ion-exchange membranes (IEMs) have significantly influenced the purification and separation process via electrodialysis (ED) [1] and other methods. A particular electric potential of the membrane solution interface has been declared to be required for co-ion repulsion through the membrane matrix (MM) in terms of the Donnan effect. As concerning this effect, as the external electrolyte concentration increases, the number of co-ions in the membrane phase increases [2]. Membrane affinity of required exchange depends on the hydrophobic zone, hydrophilic area of the water content, fixed ionic groups per unit weight, nature of the two solutions, polarization effect, etc. The hybrid IEMs are prepared through the evaporation of the solvent mixture to improve the membrane ion selectivity [6]
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