文献类型：期刊文献

英文题名：Construction of ultrathin PANI nanostructure on cation-exchange membranes for selective lithium extraction

作者：Ying, Jiadi[1,2,3];Cui, Zhen[4];Liu, Tiancun[1];Lu, Song[1];Shen, Qi[1];Guo, Min[1];Wang, Yeqing[1];Yang, Zhen[4];Zeng, Minfeng[4];Yu, Zhixin[1];Lin, Yuqing[2,5]

机构：[1]Shaoxing Univ, Key Lab Hydrogen Energy Mat & Technol Shaoxing, Shaoxing 312000, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Comprehens Utilizat Salt Lake R, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[3]Shaoxing Univ, Zhejiang Key Lab Funct Ion Membrane Mat & Technol, Shaoxing 312000, Peoples R China;[4]Shaoxing Univ, Res Ctr Adv Catalyt Mat & Funct Mol Synth, Sch Chem & Chem Engn, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[5]Kobe Univ, Res Ctr Membrane & Film Technol, Dept Chem Sci & Engn, Kobe 6578501, Japan

年份：2026

卷号：619

外文期刊名：DESALINATION

收录：;EI(收录号：20254519467283);WOS:【SCI-EXPANDED(收录号:WOS:001614060500002)】；

基金：The research was supported by the National Natural Science Foun-dation of China (22208095) , the Intergovernmental Cooperation of Science and Technology Program of Shanghai (22520710800) , and the Central Government Guiding Local Science and Technology Develop-ment Funds (2025ZY01029) .

语种：英文

外文关键词：Electrodialysis; Ion exchange membrane; Nanosized layer; Monovalent selectivity; Polyaniline

摘要：The development of thin, charge-selective surface layers on cation exchange membranes (CEMs) is crucial for advancing electrodialysis technology, particularly for achieving both high ion permeability and precise selectivity. In this study, we developed an innovative approach to fabricate ultrathin polyaniline (PANI) nanolayers on CEM substrates through pre-adsorption of protonated aniline monomers followed by in-situ polymerization. The resulting membranes feature a uniform Turing-type nanostructure through FESEM characterizations, which significantly enhances surface positive charge density. Our optimized membrane demonstrates exceptional performance, achieving a Li+/Mg2+ selectivity of 6.75 while maintaining a high lithium permeation rate of 0.18 mmol center dot cm- 2 center dot h- 1. These results compare favorably with current state-of-the-art permselective membranes and surpass the commercial membrane CSO (5.26 for the Li+/Mg2+ selectivity and 0.16 mmol center dot cm- 2 center dot h- 1 for the lithium permeation rate). Mechanistic studies including electrochemical impedance spectroscopy and molecule dynamics simulation reveal that PANI layers with optimal thickness and pore structure minimize resistance to monovalent cations while effectively blocking divalent cations, enabling efficient ion separation during electrodialysis. This work highlights the remarkable potential of nanostructured PANI layers for selective ion transport and provides a practical strategy for designing advanced electrodialysis membranes. The simple fabrication method and outstanding performance characteristics make this approach particularly promising for lithium extraction and other ion separation applications.