首页|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

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

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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.
An efficient strategy for the preparation of MIL-53(A1)-NH2 membranes with high ion selectivity and desalination performance
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.

metal-organic frameworkMIL-53(Al)-NH2membraneion selectivitydesalination

李文敏、刘政、李兴亚、傅荣强、刘兆明、徐婷婷、徐铜文

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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

山东天维膜技术有限公司,山东潍坊 261061

金属有机框架 MIL-53(Al)-NH2 膜 离子选择性 脱盐

Fundamental Research Funds for the Central UniversitiesUSTC Research Funds of the Double First Class InitiativeMajor Science and Technology Innovation Projects in Shandong Province

WK2060000030YD20600020222022CXGC020415

2024

10.52396/JUSTC-2024-0016

中国科学技术大学学报
中国科学技术大学

中国科学技术大学学报

CSTPCD北大核心
影响因子：0.421
ISSN：0253-2778
年,卷(期)：2024.54(6)