Electric field intensification has been demonstrated as an effective strategy for facilitating ion transfer and separation in polymer inclusion membrane (PIM) involved processes. However, it is still a challenge to develop compatible PIMs with high performance and to reveal the underlying mechanisms. Herein, crosslinked PIMs with different base polymers have been employed in PIM-electrodialysis processes. Cross-linked cellulose triacetate (CTA) based PIMs exhibited significant improvement in Cr(VI) transport, which permeability coefficient was 5.9 times larger than the non-cross-linked counterpart. The characterizations of cross-linked PIMs showed higher hydrophilicity and lower membrane area resistance. Furthermore, cross-linked polymeric network inside CTA based PIMs structure increased their crystallinity, thus supporting the fixed-site jumping mechanism, thereby enabling ions to be transported directly in a manner of continuous pathway at low current density. This study shed light on further improvement of efficient ion transport and gave insights into the mechanism understanding in PIM-ED systems.

中文翻译：

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聚合物包合物膜电渗析过程中交联改善离子传输及其潜在机制

电场增强已被证明是促进聚合物包裹膜 (PIM) 相关过程中离子转移和分离的有效策略。然而，开发具有高性能的兼容 PIM 并揭示其潜在机制仍然是一个挑战。在此，具有不同基础聚合物的交联 PIM 已用于 PIM 电渗析工艺。基于交联三乙酸纤维素 (CTA) 的 PIM 在 Cr(VI) 传输方面表现出显着改善，其渗透系数是非交联对应物的 5.9 倍。交联 PIM 的表征显示出更高的亲水性和更低的膜面积电阻。此外，基于 CTA 的 PIM 结构内的交联聚合物网络增加了它们的结晶度，从而支持固定位点跳跃机制，从而使离子在低电流密度下以连续路径的方式直接传输。这项研究阐明了进一步改进有效离子传输的方法，并深入了解了 PIM-ED 系统中的机制。