文献类型：期刊文献

英文题名：Ion-Selective Transport Promotion Enabled by Angstrom-Scale Nanochannels in Dendrimer-Assembled Polyamide Nanofilm for Efficient Electrodialysis

作者：Wu, Baolong[1];Gan, Ning[2];Lin, Yuqing[1];Zhang, Yiren[1];Zhang, Jiayu[1];Qiu, Yulong[1];Cao, Xingzhong[3];Yu, Jianguo[1];Matsuyama, Hideto[4]

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]Guizhou Univ, Sch Chem & Chem Engn, Guiyang 550025, Guizhou, Peoples R China;[3]Chinese Acad Sci, Inst High Energy Phys, Multidisciplinary Res Div, Beijing 100049, Peoples R China;[4]Kobe Univ, Res Ctr Membrane & Film Technol, Dept Chem Sci & Engn, Kobe 6500034, Japan

年份：2024

卷号：24

期号：28

起止页码：8650

外文期刊名：NANO LETTERS

收录：;EI(收录号：20242716645117);WOS:【SCI-EXPANDED(收录号:WOS:001260689600001)】；

基金：This research was supported by the National Natural Science Foundation of China (22208095) and the Intergovernmental Cooperation of Science and Technology Program of Shanghai (22520710800). This work was also supported by the Kobe University Strategic International Collaborative Research Grant (Type B Fostering Joint Research).

语种：英文

外文关键词：ionic PAMAM dendrimer; charged pore channel; hybrid membrane; mono/multivalent ion selectivity; efficient electrodialysis

摘要：The ion permeability and selectivity of membranes are crucial in nanofluidic behavior, impacting industries ranging from traditional to advanced manufacturing. Herein, we demonstrate the engineering of ion-conductive membranes featuring angstrom-scale ion-transport channels by introducing ionic polyamidoamine (PAMAM) dendrimers for ion separation. The exterior quaternary ammonium-rich structure contributes to significant electrostatic charge exclusion due to enhanced local charge density; the interior protoplasmic channels of PAMAM dendrimer are assembled to provide additional degrees of free volume. This facilitates the monovalent ion transfer while maintaining continuity and efficient ion screening. The dendrimer-assembled hybrid membrane achieves high monovalent ion permeance of 2.81 mol m(-2) h(-1) (K+), reaching excellent mono/multivalent selectivity up to 20.1 (K+/Mg2+) and surpassing the permselectivities of state-of-the-art membranes. Both experimental results and simulating calculations suggest that the impressive ion selectivity arises from the significant disparity in transport energy barrier between mono/multivalent ions, induced by the "exterior-interior" synergistic effects of bifunctional membrane channels.