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Highly efficient monovalent ion transport enabled by ionic crosslinking-induced nanochannels |
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| Authors: | Yiren Zhang Yuqing Lin Jiadi Ying Wei Zhang Yan Jin Hideto Matsuyama Jianguo Yu |
| Affiliation: | 1. National Engineering Research Center for Comprehensive Utilization of Salt Lake Resources, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China Contribution: Conceptualization (equal), Data curation (equal), Writing - original draft (equal);2. National Engineering Research Center for Comprehensive Utilization of Salt Lake Resources, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China;3. National Engineering Research Center for Comprehensive Utilization of Salt Lake Resources, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China Contribution: Data curation (equal), Formal analysis (equal);4. National Engineering Research Center for Comprehensive Utilization of Salt Lake Resources, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China Contribution: Formal analysis (equal);5. National Engineering Research Center for Comprehensive Utilization of Salt Lake Resources, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China Contribution: Investigation (equal), Methodology (equal);6. Research Center for Membrane and Film Technology, Department of Chemical Science and Engineering, Kobe University, Kobe, Japan Contribution: Supervision (equal), Validation (equal), Visualization (equal), Writing - review & editing (equal) |
| Abstract: | Charge-governed ion transport is of significant importance to industrial development, and advanced membrane materials with fast and selective ionic transport are essential components. In cell membranes, ionic transport is mainly determined by the charge-governed protein channels, representing an architecture with functional differentiation. Inspired by this, a novel class of membranes was developed by ionically crosslinking sulfonated (poly[ether ether ketone]) and quaternized poly(2,6-dimethyl-1,4-phenylene oxide) to construct the cationic conductive biomimetic nanochannels. Ionic crosslinking was tailored to realize nanophase separation and efficient ion transport mainly based on surface chemistry without altering the scaffold feature of polymeric pore channels. The best-performing ionic crosslinking membrane exhibited a high ionic permeation (2.23 mol·m−2·h−1 for K+) and high cationic selectivity (7.91 for K+/Mg2+), which were comparable with the commercial monovalent cation permselective CIMS membrane, owing to the negligent surface resistance toward monovalent cations but strong positively charged repulsion against divalent cations. |
| Keywords: | electrodialysis ion exchange membrane ionic crosslinking ionic sieving monovalent selectivity |