Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 301, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.121939
Keywords
Ionic liquids; Lanthanide separations; Task-specific ionic liquids; Solvent extractions; HOPO ligands
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Separation Science program and Materials Chemistry program [DE- SC00ERKCG21]
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A 1,2-hydroxypyridinone (HOPO) grafted ionic liquid (HOPO-IL) was synthesized and investigated for its extraction performance in various ionic liquids (ILs) and organic solvents. The results showed that the extraction performance of this HOPO-IL extractant was enhanced by approximately 2 folds in IL solvents compared to organic solvents. The study also revealed a strong pH dependence and a dominant cation-exchange mechanism of lanthanide extraction.
A 1,2-hydroxypyridinone (HOPO) grafted ionic liquid (HOPO-IL) was synthesized for the first time and characterized by NMR spectroscopy and mass spectrometry. The solvent extraction of this HOPO-IL used as an extractant for lanthanide separation in various ionic liquids (ILs) and organic solvent was investigated, revealing enhanced extraction performance in the IL solvents. The extraction performance increased by similar to 2 folds in ILs than in organic solvent. The extraction behavior of this HOPO-IL extractant was also compared in aqueous solutions under different acidities. The effects of aqueous phase acidity and the additions of an IL's cation or anion to the aqueous phase on separation properties of lanthanides are studied, indicating a strong pH-dependence and a dominant cation-exchange mechanism of lanthanide extraction.
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