Abstract
Currently, it is commonly observed that ion flux decreases as the separation performance of cation exchange membranes between mono- and double-charged ions improves. Therefore, cation exchange membranes with simultaneously excellent separation performance and high ionic flux must be developed. Herein, a series of pure and organic-inorganic cross-linked membranes were synthesized using UV irradiation. The synthetic membranes showed high ion-exchange capacity (IEC) and large ion flux. The organic-inorganic membranes achieved excellent mechanical properties, thermal stability, and separation properties owing to the addition of SiO2. When the silica content was 4 wt%, the three ionic perm-selectivity showed their highest separation performances of 1.70 ± 0.03(PKNa), 5.84 ± 0.04(PKMg), and 25.67 ± 0.04 (PKCa), representing an increase of 70% (PKNa), 279.22% (PKMg), and 1236.98% (PKCa) compared than those of pure membrane. In addition, the limiting current density of the prepared organic-inorganic membranes was all >8.74 mA/cm2, higher than that of commercial membrane. According to these excellent performances, the prepared membranes showed good prospects for separation performance of cation exchange membranes. The addition of a proper amount of inorganic particles can improve the ion perm-selectivity between mono- and double-charged ions.
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