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Understanding the Ion Transport Behavior across Nanofluidic Membranes in Response to the Charge Variations

机译：响应于电荷变化，了解跨流体膜跨越纳米流体膜的离子传输行为

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摘要

Biological pores regulate the cellular traffic of a diverse collection of molecules, often with extremely high selectivity. Given the ubiquity of charge-based separation in nature, understanding the link between the charged functionalities and the ion transport activities is essential for designing delicate separations, with the correlation being comparatively underdeveloped. Herein, the effect of charge density from the impact of pore structure is decoupled using a multivariate strategy for the construction of covalent organic framework-based membranes. How the density of charged sites in the nanofluidic membranes affect the ion transport activity with particular emphasis on Li+ and Mg2+ ions, relevant to the challenge of salt-lake lithium mining is systematically investigated. Systematic control of the charge distribution produces membranes with numerous advantages, overcoming the long-term challenge of Li+/Mg2+ separation. The top membrane exhibits an outstanding equilibrium selectivity for Li+ over Mg2+ and operational stability under diffusion dialysis and electrodialysis conditions (Li+/Mg2+ up to 500), qualifying it as a potential candidate for lithium extraction. It is anticipated that the developed nanofluidic membrane platform can be further leveraged to tackle other challenges in controlled separation processes.
机译：生物毛孔调节各种分子集合的细胞交通，通常具有极高的选择性。鉴于基于电荷的分离的无处不在，了解带电功能和离子运输活动之间的联系对于设计精细分离至关重要，相关性相对较近。这里，利用孔结构的冲击的电荷密度的影响使用多元策略对基于共价有机骨架的膜构建的多元策略分离。纳米流体膜中带电位点的密度如何影响离子转运活性，特别强调Li +和Mg2 +离子，系统地研究了盐湖锂矿的挑战。系统控制电荷分布产生具有多种优点的膜，克服Li + / Mg2 +分离的长期挑战。顶部膜对Li +的Li + Oper Mg2 +的优质平衡选择性和在扩散透析和电渗析条件下的操作稳定性（Li + / Mg2 +最多500），使其作为锂萃取的潜在候选者。预计开发的纳米流体膜平台可以进一步利用以应对受控分离过程中的其他挑战。

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