Grafted membranes based on polyvinylidene fluoride and sulfonated polystyrene doped with polyaniline for ion separation by electrodialysis

Le résumé fourni par la source

Monovalent ion-selective membranes are of great relevance for water purification and ion separation, especially for lithium recovery from seawater, mine water or battery recycling products. In this work, a series of radiation-grafted membranes based on polyvinylidene fluoride and sulfonated polystyrene with various degrees of grafting and sulfonation were prepared. Improvement of monovalent cations transport was achieved by creating hydrophobic layers with low charge carrier concentrations within the membrane by altering the uniformity of sulfonic acid groups distribution and modifying the membranes with polyaniline. When evaluated in mixed electrolyte solutions containing Li+, Na+, Mg2+, Ca2+ cations, permselectivities P(Na+/Mg2+) and P(Li+/Mg2+) of the modified membrane increase by 4.5–5 times reaching 3.69 and 2.36, respectively. This work demonstrates an effective approach to tuning monovalent cation selectivity of membranes.

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