Ion pair extractant selective for LiCl and LiBr

Improved methods for achieving the selective extraction of lithium salts from lithium sources, including rocky ores, salt-lake brines, and end-of-life lithium-ion batteries, could help address projected increases in the demand for lithium. Here, we report an ion pair receptor ( 2 ) capable of extrac...

Full description

Saved in:
Bibliographic Details
Published in:Chemical science (Cambridge) 2024-08, Vol.15 (34), p.13958-13965
Main Authors: Heo, Nam Jung, Oh, Ju Hyun, Li, Aimin, Lee, Kyounghoon, He, Qing, Sessler, Jonathan L, Kim, Sung Kuk
Format: Article
Language:English
Subjects:
Aqueous solutions
Binding sites
Calcium chloride
Calcium ions
Chemistry
End of life
Ion pairs
Liquid-liquid extraction
Lithium
Lithium chloride
Lithium-ion batteries
Receptors
Selectivity
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Improved methods for achieving the selective extraction of lithium salts from lithium sources, including rocky ores, salt-lake brines, and end-of-life lithium-ion batteries, could help address projected increases in the demand for lithium. Here, we report an ion pair receptor ( 2 ) capable of extracting LiCl and LiBr into an organic receiving phase both from the solid state and from aqueous solutions. Ion pair receptor 2 consists of a calix[4]pyrrole framework, which acts as an anion binding site, linked to a phenanthroline cation binding motif via ether linkages. Receptor 2 binds MgBr 2 and CaCl 2 with high selectivity over the corresponding lithium salts in a nonpolar aprotic solvent. The preference for Mg 2+ and Ca 2+ salts is reversed in polar protic media, allowing receptor 2 to complex LiCl and LiBr with high selectivity and affinity in organic media containing methanol or water. The effectiveness of receptor 2 as an extractant for LiCl and LiBr under liquid-liquid extraction (LLE) conditions was found to be enhanced by the presence of other potentially competitive salts in the aqueous source phase. An ion pair receptor is reported that is capable of extracting LiCl and LiBr selectively from aqueous phases; the extraction efficiency is enhanced by the presence of other competitive salts.
ISSN:2041-6520
2041-6539
DOI:10.1039/d4sc03760j