文献类型：期刊文献

英文题名：Layer-by-layer assembly of cation exchange membrane for highly efficient monovalent ion selectivity

作者：Ying, Jiadi[1];Lin, Yuqing[1];Zhang, Yiren[1];Jin, Yan[1];Matsuyama, Hideto[2];Yu, Jianguo[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Comprehens Utilizat Salt Lake Re, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Kobe Univ, Res Ctr Membrane & Film Technol, Dept Chem Sci & Engn, Kobe 6578501, Japan

年份：2022

卷号：446

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20222212186463);WOS:【SCI-EXPANDED(收录号:WOS:000806754000003)】；

基金：Acknowledgments: The research was supported by the Open Project of State Key Labo-ratory of Chemical Engineering (SKL-ChE-20C03) .

语种：英文

外文关键词：Electrodialysis; Ion exchange membrane; Layer-by-layer assembly; Monovalent selectivity; Polyelectrolyte modification

摘要：The development of cation exchange membranes (CEMs) with high monovalent/divalent cation selectivity has great potential for enhanced salt separation for wastewater reclamation, and layer-by-layer (LbL) self-assembly of polyelectrolyte films with high monovalent selectivities among cations has expanded the applications of such membranes. However, the structure-property relationship for constructing multilayered polyelectrolyte films with enhanced separation performance remains poorly understood. This study reports a novel CEM engineered by coating a [polyethyleneimine/polystyrene sulfonate (PEI/PSS)]n alternate electro-deposition multilayer on a polyacrylate substrate membrane. The newly developed CEM exhibited a monovalent selectivity of 4.59 for Li+/ Mg2+ with an optimal permeation of 0.16 mmol.cm(-2).h(-1) for Li+, demonstrating a competitive separation property compared to state-of-the-art permselective membranes. A detailed quantitative investigation provides the underlying insights into the monovalent selectivity for each polyelectrolyte layer. The results indicate negligible interface impedance toward monovalent cations but strengthened repulsion against divalent cations, thereby promoting a quick passage for monovalent cations while imposing temporal retardation on divalent cations during the electrodialysis (ED) process. Therefore, this study elucidates the characteristic reason for the enhanced monovalent ion permselectivity of LbL polyelectrolyte membranes in electro-driven separation processes.