Double charge flips of polyamide membrane by ionic liquid-decoupled bulk and interfacial diffusion for on-demand nanofiltration

Bian-Bian Guo, Chang Liu, Cheng-Ye Zhu, Jia-Hui Xin, Chao Zhang (), Hao-Cheng Yang () and Zhi-Kang Xu ()
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Bian-Bian Guo: Zhejiang University
Chang Liu: Zhejiang University
Cheng-Ye Zhu: Zhejiang University
Jia-Hui Xin: Zhejiang University
Chao Zhang: Zhejiang University
Hao-Cheng Yang: Zhejiang University
Zhi-Kang Xu: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Fine design of surface charge properties of polyamide membranes is crucial for selective ionic and molecular sieving. Traditional membranes face limitations due to their inherent negative charge and limited charge modification range. Herein, we report a facile ionic liquid-decoupled bulk/interfacial diffusion strategy to elaborate the double charge flips of polyamide membranes, enabling on-demand transformation from inherently negative to highly positive and near-neutral charges. The key to these flips lies in the meticulous utilization of ionic liquid that decouples intertwined bulk/interfacial diffusion, enhancing interfacial while inhibiting bulk diffusion. These charge-tunable polyamide membranes can be customized for impressive separation performance, for example, profound Cl−/SO42− selectivity above 470 in sulfate recovery, ultrahigh Li+/Mg2+ selectivity up to 68 in lithium extraction, and effective divalent ion removal in pharmaceutical purification, surpassing many reported polyamide nanofiltration membranes. This advancement adds a new dimension to in the design of advanced polymer membranes via interfacial polymerization.

Date: 2024
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DOI: 10.1038/s41467-024-46580-6

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