Engineering hydrophilicity of graphene oxide membranes via poly(ionic liquid)s intercalation for efficient anion separation

doi:10.1016/j.cjche.2025.02.015

中国化学工程学报 ›› 2025, Vol. 81 ›› Issue (5): 45-56.DOI: 10.1016/j.cjche.2025.02.015

Engineering hydrophilicity of graphene oxide membranes via poly(ionic liquid)s intercalation for efficient anion separation

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

Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China

收稿日期:2024-11-12 修回日期:2025-02-19 接受日期:2025-02-20 出版日期:2025-05-28 发布日期:2025-03-11
通讯作者: Jin Ran,E-mail:ranjin@hfut.edu.cn
基金资助:
This work was supported by the National Key Research and Development Program of China (2022YFB3805100), and the National Natural Science Foundation of China (22278105, 21978062).

Engineering hydrophilicity of graphene oxide membranes via poly(ionic liquid)s intercalation for efficient anion separation

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

Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China

Received:2024-11-12 Revised:2025-02-19 Accepted:2025-02-20 Online:2025-05-28 Published:2025-03-11
Contact: Jin Ran,E-mail:ranjin@hfut.edu.cn
Supported by:
This work was supported by the National Key Research and Development Program of China (2022YFB3805100), and the National Natural Science Foundation of China (22278105, 21978062).

摘要/Abstract

摘要： Two dimensional (2D) membranes show huge potential for ion sieving applications owing to their regular sub-nanometer channels. How to engineer the channel micro-chemistry to pursue higher ion selectivity while maintaining promising ion transports remains challenging. In this work, we propose building rigidly confined charged 2D graphene oxide (GO) channels and manipulating their hydrophilicity via self-designed poly(ionic liquid)s (PILs) intercalation. The imidazolium cations on the PILs backbone not only stabilize the GO interlayer channels via non-covalent interactions but also create a positively charged environment for attracting anions entering into channels. The hydrophilicity variations of the side chains on the PILs help with realizing the regulation of the channel hydrophilicity. Under the electrodialysis mode, the GO membrane with the strongest hydrophobicity yields an impressive selectivity of 172.2 for Cl^- and SO₄^2-, which is 48 times of Neosepta ACS, a commercial membrane specialized for anion separation. This work offers a brand-new route in exploring high-performance ion selective membranes.

关键词: Ion separation, Electrodialysis, GO, Hydrophobic channel, Two-dimensional membrane

Abstract: Two dimensional (2D) membranes show huge potential for ion sieving applications owing to their regular sub-nanometer channels. How to engineer the channel micro-chemistry to pursue higher ion selectivity while maintaining promising ion transports remains challenging. In this work, we propose building rigidly confined charged 2D graphene oxide (GO) channels and manipulating their hydrophilicity via self-designed poly(ionic liquid)s (PILs) intercalation. The imidazolium cations on the PILs backbone not only stabilize the GO interlayer channels via non-covalent interactions but also create a positively charged environment for attracting anions entering into channels. The hydrophilicity variations of the side chains on the PILs help with realizing the regulation of the channel hydrophilicity. Under the electrodialysis mode, the GO membrane with the strongest hydrophobicity yields an impressive selectivity of 172.2 for Cl^- and SO₄^2-, which is 48 times of Neosepta ACS, a commercial membrane specialized for anion separation. This work offers a brand-new route in exploring high-performance ion selective membranes.

Key words: Ion separation, Electrodialysis, GO, Hydrophobic channel, Two-dimensional membrane

Rui Jia, Xingyun Li, Ruonan Tan, Zongliang Wan, Jiu Yang, Ziqiang Hong, Zheng Ji, Suixin Zhang, Jingjing Gu, Cenfeng Fu, Jin Ran. Engineering hydrophilicity of graphene oxide membranes via poly(ionic liquid)s intercalation for efficient anion separation[J]. 中国化学工程学报, 2025, 81(5): 45-56.

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Engineering hydrophilicity of graphene oxide membranes via poly(ionic liquid)s intercalation for efficient anion separation

Engineering hydrophilicity of graphene oxide membranes via poly(ionic liquid)s intercalation for efficient anion separation

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