Rigid and flexible coupled micropore membranes enabling ultra-efficient anion separation

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2025-02-28 DOI:10.1002/aic.18803

Ziqiang Hong, Zongliang Wan, Jingjing Gu, Jiu Yang, Xingyun Li, Ruonan Tan, Suixin Zhang, Rui Jia, Zheng Ji, Jin Ran, Cen-Feng Fu

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引用次数: 0

Abstract

The swift advancement of monovalent anion perm-selective membranes (MAPMs) presents a promising and sustainable approach for anion separation. However, their progress remains predominantly based on microphase-separated membranes characterized by wide, swelling ion-selective channels. In this study, the rigidity and flexibility coupled concept was employed to engineer rigidly confined ion-selective channels within MAPMs to facilitate anion separation. The rigid segments self-assemble into micropores (<0.8 nm), with dimensions precisely modulated by the flexible segments. Under electrodialysis conditions, these membranes demonstrate an order-of-magnitude improvement in selectivity compared with Neosepta® ACS commercial membranes (special for anion separation), with a slight increase in the permeation flux of monovalent anions. The simulation results confirm that the difference in the confinement of various anions, driven by electrostatic interactions within the rigid micropores, is responsible for the exceptional monovalent/bivalent selectivity. Overall, this study provides an alternative strategy to construct rigidly confined channels for efficient anion separation.

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刚性和柔性耦合微孔膜实现超高效阴离子分离

单价阴离子热选择性膜（MAPMs）的迅速发展为阴离子分离提供了一种有前途和可持续的方法。然而，它们的进展仍然主要基于微相分离膜，其特点是宽，膨胀的离子选择通道。在本研究中，采用刚性和柔性耦合的概念来设计MAPMs内的刚性限制离子选择通道，以促进阴离子分离。刚性段自组装成微孔（<0.8 nm），其尺寸由柔性段精确调节。在电渗析条件下，与Neosepta®ACS商用膜（专门用于阴离子分离）相比，这些膜的选择性有了数量级的提高，单价阴离子的渗透通量略有增加。模拟结果证实，由刚性微孔内静电相互作用驱动的各种阴离子的限制差异是导致异常的单价/二价选择性的原因。总的来说，这项研究提供了一种替代策略来构建严格限制的通道，以实现有效的阴离子分离。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.