一种制备具有高离子选择性和脱盐性能的MIL-53(Al)-NH2膜的有效策略
An efficient strategy for the preparation of MIL-53(A1)-NH2 membranes with high ion selectivity and desalination performance
李文敏 1刘政 1李兴亚 1傅荣强 2刘兆明 2徐婷婷 1徐铜文1
作者信息
- 1. 中国科学技术大学精准智能化学重点实验室,化学与材料科学学院应用化学系,安徽合肥 230026
- 2. 山东天维膜技术有限公司,山东潍坊 261061
- 折叠
摘要
钠(Na+)和锂(Li+)在化学工业中具有巨大的应用价值,因此对从海水和盐湖中高效提取钠和锂的技术要求越来越高.然而,二价钙离子(Ca2+)和镁离子(Mg2+)等共存阳离子的直径与目标单价离子的直径均处于亚纳米级尺寸,这使得分离目标离子成为一项巨大的挑战.本文提出了一种简单快速的二次生长方法,在阳极氧化铝表面制备MIL-53(Al)-NH2膜.该膜含有埃级(约～7Å)通道,允许较小的一价离子和水分子进入,从而调节一价阳离子对二价阳离子的选择性和脱盐性能.所制备的MIL-53(Al)-NH2膜具有出色的离子分离性能(Na+/Ca2+选择性为121.42,Li+/Mg2+选择性为93.81)和脱盐性能(水/盐选择性高达5196).这项工作表明MOF膜在离子分离和脱盐的应用中极具潜力.
Abstract
The efficient extraction of sodium(Na+)and lithium(Li+)from seawater and salt lakes is increasingly demand-ing due to their great application value in chemical industries.However,coexisting cations such as divalent calcium(Ca2+)and magnesium(Mg2+)ions are at the subnanometer scale in diameter,similar to target monovalent ions,making ion separ-ation a great challenge.Here,we propose a simple and fast secondary growth method for the preparation of MIL-53(Al)-NH2 membranes on the surface of anodic aluminum oxide.Such membranes contain angstrom-scale(～7 Å)channels for the entrance of small monovalent ions and water molecules,endowing the selectivities for monovalent cations over divalent cations and water over salt molecules.The resulting high-connectivity MIL-53(A1)-NH2 membranes exhibit excel-lent ion separation performance(a selectivity of 121.42 for Na+/Ca2+and 93.81 for Li+/Mg2+)and desalination performance(a water/salt selectivity of up to 5196).This work highlights metal-organic framework membranes as potential candidates for realizing ion separation and desalination in liquid treatment.
关键词
金属有机框架/MIL-53(Al)-NH2/膜/离子选择性/脱盐Key words
metal-organic framework/MIL-53(Al)-NH2/membrane/ion selectivity/desalination引用本文复制引用
基金项目
Fundamental Research Funds for the Central Universities(WK2060000030)
USTC Research Funds of the Double First Class Initiative(YD2060002022)
Major Science and Technology Innovation Projects in Shandong Province(2022CXGC020415)
出版年
2024
NETL
NSTL
万方数据