文献类型：期刊文献

英文题名：Freestanding two-dimensional nanofluidic membranes modulated by zwitterionic polyelectrolyte for mono-/di-valent ions selectivity transport

作者：Dai, Liheng[1];Pang, Sichen[1];Li, Shiyi[1];Yi, Zhiyuan[1];Qu, Kai[1];Wang, Yixing[1];Wu, Yulin[1];Li, Siyao[1];Lei, Linfeng[1];Huang, Kang[2];Guo, Xuhong[1];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Nanjing Tech Univ, Coll Chem Engn, State Key Lab Mat Oriented Chem Engn, 30 Puzhu South Rd, Nanjing 211816, Peoples R China

年份：2023

卷号：677

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20231613901652);WOS:【SCI-EXPANDED(收录号:WOS:001429333400001)】；

基金：The authors gratefully acknowledge the research funding provided by National Key R&D Program of China (Grant Nos. 2021YFB3801301) and National Natural Science Foundation of China (Grant Nos. 22075076, 21908054).

语种：英文

外文关键词：Two-dimensional membrane; Graphene oxide; Ion-selective transport; Confined mass transfer; Monovalent/divalent ions separation

摘要：Effective separation of mono-/di-valent metal ions based on membrane technology is highly desirable in the energy storage and environmental protection field, but requires membranes capable of selective recognition of ions with similar nano-scale size. In this work, we designed and synthesized the sulfonate polyethylenimine (PEI-SO3H), as a zwitterionic polyelectrolyte, and integrated it into two-dimensional (2D) graphene oxide (GO) confined channels. Stable and sub-nanometer ion-selective transport channels enable fast transport of monovalent metal ions with high mono-/di-valent ion selectivity for K+/Mg2+ (12.2), Na+/Mg2+ (11.4) and Li+/Mg2+ (10.1) under electric field. Notably, the hydration compensation-promoting diffusion (HCPD) mechanism based on the synergistic effect of amino groups as compensation sites and sulfonic acid groups as recognition sites was proposed to understand the high-efficiency ion-selective transport process. In addition, instructed by above-mentioned theory, the 2D vermiculite membrane was also designed to well realize the mono-/di-valent ions separation. This study provides a new strategy to construct freestanding 2D membranes with efficient ionselective transport channels instructed by HCPD theory, which is expected to expand the potential for using membranes in the lithium extraction.