文献类型：期刊文献

英文题名：Supramolecular-coordinated nanofiltration membranes with quaternary-ammonium Cyclen for efficient lithium extraction from high magnesium/lithium ratio brine

作者：Gan, Ning[1,2];Lin, Yuqing[2];Wu, Baolong[2];Qiu, Yulong[2];Sun, Haopan[2];Su, Jingwen[2];Yu, Jianguo[2];Lin, Qian[1];Matsuyama, Hideto[3]

机构：[1]Guizhou Univ, Sch Chem & Chem Engn, Guiyang 550025, Guizhou, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[3]Kobe Univ, Res Ctr Membrane & Film Technol, Kobe, 6578501, Japan

年份：2025

卷号：268

外文期刊名：WATER RESEARCH

收录：;EI(收录号：20244517307974);WOS:【SCI-EXPANDED(收录号:WOS:001350516900001)】；

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：Nanofiltration; Supramolecular-Coordinated membrane; Macrocyclic Cyclen; Nanochannel; Lithium extraction

摘要：Ion-selective membranes (ISM) with sub-nanosized pore channels hold significant potential for applications in saline wastewater treatment and resource recovery. Herein, novel synergistic ion channels featuring bi-periodic structures were constructed through the coordination of functional Cyclen (quaternary_1,4,7,10-tetraazacyclododecane, Q_Cyclen) and Cu2+-m-Phenylenediamine (Cu2+-MPD) to develop supramolecular membranes for lithium extraction. The exterior quaternary ammonium-rich sites exhibit a significant Donnan exclusion effect, resulting in tremendous mono/divalent (Li+/Mg2+) ion selectivity; while the interior regular-confined channels of Cyclen yield a fast vehicular pathway, facilitating water molecules and Li+ ion-selective transport. The optimized membrane exhibited an increased water permeance of 19.2 L & sdot;m-2 & sdot;h-1 & sdot;bar-1 and simultaneously promoted Li+/Mg2+ selectivity (achieving a selectivity of 18.5 under a Mg2+/Li+ mass ratio of 30), surpassing the trade-off limit of conventional nanofiltration membranes. Due to the acquired excellent Li+/Mg2+ selectivity, lithium extraction from simulated salt-lake brines was successfully achieved through a two-stage nanofiltration process, reducing the Mg2+/Li+ mass ratio from 40 to 1.1. This work validates the applicability of macrocyclic with intrinsic sub-nanosized channels and desired multifunctionality for developing high-performance ISM for efficient lithium separation and beyond.