Fluorine ion contained polyionic liquid membranes with improved anion selectivity and CO2/N2 separation property

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-06-03 DOI:10.1016/j.seppur.2025.133853

Dongyun Wei, Yongli Shen, Jianxiang Huang, Yanli Chen, Qibo Deng, Yunfeng Zhao, Xiaohua Ma

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引用次数: 0

Abstract

Carbon dioxide (CO₂) is a well-known greenhouse gas, and the urgent development of high-performance CO₂ separation technologies is essential. In this study, we fabricated a network ionic liquids membrane (ILMs) (CPDEAEMA) by incorporating 1,6-dibromohexane into poly (N, N-diethylaminoethyl methacrylate) (PDEAEMA). Thereafter, different functional ionic (OH^–, F⁻, Cl⁻, Br⁻) were introduced by interacting with quaternary ammonium cations, thereby modulating both ionic conductivity and gas permeability. Notably, the F⁻ exchange membrane (F-CPDEAEMA) exhibited both the best ionic conductivity of 10.3 mS/cm, and highest CO₂ permeability of 111.5 Barrer combined with CO₂/N₂ selectivity of 32.0 among different ion exchange membranes. Theoretical calculations indicate that CO₂ molecules interact primarily with halogen anions and methyl groups on quaternary ammonium via various weak intermolecular interactions. Among these interactions, CO₂ exhibits the strongest interaction with F⁻, and the calculated results align with the CO₂ permeability (F > Br > Cl), confirming the effectiveness of the anion-exchange strategy. This provides a novel approach for designing ionic polymer membranes that enhance both ion-exchange capacity and gas separation efficiency.

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含氟多离子液体膜具有较好的阴离子选择性和CO2/N2分离性能

二氧化碳（CO2）是一种众所周知的温室气体，开发高性能的CO2分离技术刻不容缓。在本研究中，我们将1,6-二溴己烷掺入聚（N， N-二乙基氨基乙基甲基丙烯酸酯）（PDEAEMA）中制备了网络离子液体膜（ILMs）（CPDEAEMA）。然后，通过与季铵离子的相互作用，引入不同的功能离子（OH -, F−,Cl−,Br−），从而调节离子电导率和气体渗透性。值得注意的是，F- cpdeaema在不同的离子交换膜中离子电导率最高，为10.3 mS/cm， CO2渗透率最高，为111.5 Barrer， CO2/N2选择性为32.0。理论计算表明，CO2分子主要通过各种弱分子间相互作用与季铵盐上的卤素阴离子和甲基相互作用。在这些相互作用中，CO2与F−的相互作用最强，计算结果与CO2渗透率(F >；Br >； Cl)，证实了阴离子交换策略的有效性。这为离子聚合物膜的设计提供了一种新的途径，可以同时提高离子交换能力和气体分离效率。

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

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.