文献类型：期刊文献

英文题名：2D nanofluidic vermiculite membranes with self-confinement channels and recognition sites for ultrafast lithium ion-selective transport

作者：Pang, Sichen[1];Dai, Liheng[1];Yi, Zhiyuan[1];Qu, Kai[1];Wang, Yixing[1];Wu, Yulin[1];Fang, Chuning[1];Huang, Kang[2];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：687

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20233714714924);WOS:【SCI-EXPANDED(收录号:WOS:001083472800001)】；

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; Vermiculite; Lithium ion-selective transport; Confined mass transfer; Mono-/multi-valent ions separation

摘要：Two-dimensional (2D) membranes with lamina nanofluidic channels hold great promise for ion selective transport. However, the complex nanosheets preparation process and undesirable ion sieving ability of 2D channels in aqueous environment hindered the further application of 2D membranes. Herein, we designed and constructed 2D vermiculite-based nanofluidic membranes with ultrafast lithium ion-selective transport channels through interlayer chemical modification-to introduce sulfonated polyvinyl alcohol (SPVA). As for salt con-centration of 0.2 M, the optimal VmMS-1 membrane with stable and sub-nanometer ion selective channels exhibited high Li+ permeation rate up to similar to 1.3 mol m(- 2) h(-1) driven by concentration gradient difference, while the selectivity of Li+/Mg2+, Li+/Na+, and Li+/K+ reached 23.8, 14.9, 19.1, respectively. Self-confinement ion recognition (SCIR) mechanism was proposed to describe the superior lithium ion-selective transport process in 2D confined channels. Self-confinement interlayer channel could manipulate the water-shell layer of ions and sulfonic acid groups could effectively recognize lithium ion to accelerate them transport. This study provides a new vermiculite membrane design insight based on SCIR mechanism that is expected to achieve high lithium extraction, as well as providing a new insight of membrane design for other 2D materials.