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Ion pair extractant selective for LiCl and LiBr

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/D4SC03760J· OSTI ID:2429074
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 MgBr2 and CaCl2 with high selectivity over the corresponding lithium salts in a nonpolar aprotic solvent. The preference for Mg2+ and Ca2+ 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.
Research Organization:
The University of Texas at Austin, TX (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF); Robert A. Welch Foundation; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0024393
OSTI ID:
2429074
Alternate ID(s):
OSTI ID: 2472335
OSTI ID: 3008476
Journal Information:
Chemical Science, Journal Name: Chemical Science Journal Issue: 34 Vol. 15; ISSN 2041-6539; ISSN 2041-6520
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United States
Language:
English

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