期刊
DESALINATION
卷 532, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.desal.2022.115733
关键词
UiO-66; Ion selective membrane; Direct lithium extraction; Taijiner brine
资金
- UTS CPRDF award [PRO20-11072]
- Australian Research Council-Discovery Early Career Researcher Award (DECRA) [DE180100688]
- ARC Dis-covery project [DP180103874]
This study proposes a new method for preparing double-layered UiO-66-based membranes for Mg2+ and Li+ separation in brine. The membranes exhibit high selectivity for Li+ over Mg2+ and provide a promising solution for enriching Li+ from salt lake brines. The effects and mechanisms under different conditions are discussed. This research is important for developing lithium separation techniques and addressing issues related to salt lake brines.
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.
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