A lithium ion selective membrane synthesized from a double layered Zrbased metalorganic framework (MOF-on-MOF) thin film

Document Type

Journal Article

Publication Title

Desalination

Volume

532

Publisher

Elsevier

School

School of Engineering

RAS ID

51757

Funders

UTS CPRDF award (PRO20-11072),

Australian Research Council-Discovery Early Career Researcher Award (DECRA) DE180100688, DP180103874

Grant Number

ARC Numbers : DE180100688, DP180103874

Comments

Xiao, H., Chai, M., Abdollahzadeh, M., Ahmadi, H., Chen, V., Gore, D. B., ... & Razmjou, A. (2022). A lithium ion selective membrane synthesized from a double layered zrbased metalorganic framework (MOF-on-MOF) thin film. Desalination, 532, 115733.

https://doi.org/10.1016/j.desal.2022.115733

Abstract

The ever-growing global demands for lithium (Li+) require energy-efficient techniques to separate lithium from natural resources and commercial wastewaters. We propose a facile seed-assisted in-situ growth method to prepare double-layered UiO-66-based (–(COOH)2 and –NH2) membranes for Mg2+ and Li+ separation in brine. These membranes, with sub-nanometer-sized windows, nanometer-sized cavities, and functional groups can selectively transport K+, Na+, Li+ over Mg2+ and Ca2+. A carboxyl-functionalized UiO-66-based membrane showed higher Li+ and Mg2+ selectivity (up to 90.8) than a UiO-66-NH2 membrane (65.0) by the current-voltage method using single salt solutions. Carboxylic groups greatly enhance membrane selectivity for Li+ over Mg2+. The effects and mechanisms of (i) different feed concentrations in a mono-ion system, and (ii) concentration gradients and electrical potential as driving forces for Li+ extraction in a synthetic multi-ion brine, are discussed. The UiO-66-(COOH)2/UiO-66-NH2 anodized aluminum oxide membrane exhibited excellent Mg2+/Li+ separation efficiency in synthetic Qinghai Taijiner salt lake brine (abbreviated as Taijiner brine) under concentration gradients. This research will promote metal-organic framework-based membrane designs with tailored pore morphologies and provide an innovative and eco-friendly solution for Li+ enrichment from salt lake brines.

DOI

10.1016/j.desal.2022.115733

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