<abstract xmlns="http://www.w3.org/1999/xhtml">

Separation among rubidium and potassium ions from salt lake brines remains challenging. In this work, a typical room temperature ionic liquid 1-ethyl-3-metyhlimidazaolium bis(trifluoromethylsulfonyl)imide ([C2mim+][NTf2–]) was used as diluent and synergistic extractant, dicyclohexano-18-crown-6 (DCH18C6) was used as extractant to extract rubidium ions from brine solutions which contain high concentrations of potassium ions was investigated. Under the optimal conditions, the single extraction efficiency of rubidium ions was up 93.63%. The thermodynamic parameters of the rubidium ion extraction were obtained. Based on the slope analysis method, the extracted species in the organic phase were ascertained as 1:1 complex. UV-visible has been performed to investigate the ion concentration of ionic liquid before and after the interaction of metal ions and ligands. Rubidium ions in [Rb · DCH18C6]+ complex were stripped by 2.5 mol · L–1 NH4NO3. The extraction system offers high efficiency, simplicity and environmentally friendly application prospect to separate rubidium from brine solutions.
</abstract>

Separation among rubidium and potassium ions from salt lake brines remains challenging. In this work, a typical room temperature ionic liquid 1-ethyl-3-metyhlimidazaolium bis(trifluoromethylsulfonyl)imide ([C2mim+][NTf2–]) was used as diluent and synergistic extractant, dicyclohexano-18-crown-6 (DCH18C6) was used as extractant to extract rubidium ions from brine solutions which contain high concentrations of potassium ions was investigated. Under the optimal conditions, the single extraction efficiency of rubidium ions was up 93.63%. The thermodynamic parameters of the rubidium ion extraction were obtained. Based on the slope analysis method, the extracted species in the organic phase were ascertained as 1:1 complex. UV-visible has been performed to investigate the ion concentration of ionic liquid before and after the interaction of metal ions and ligands. Rubidium ions in [Rb · DCH18C6]+ complex were stripped by 2.5 mol · L–1 NH4NO3. The extraction system offers high efficiency, simplicity and environmentally friendly application prospect to separate rubidium from brine solutions.

Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system

Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation

Chemistry and Material Science, East China University of Technology

Polish Journal of Chemical Technology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Separation among rubidium and potassium ions from salt lake brines remains challenging. In this work, a typical room temperature ionic liquid...

Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system

Published Online: Mar 29, 2023

Page range: 61 - 68

DOI: https://doi.org/10.2478/pjct-2023-0009

Keywords
Rubidium, Ionic liquid, Dicyclohexano-18-crown-6, Solvent extraction

© 2023 Dongfang Huang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system

Published Online: Mar 29, 2023

Page range: 61 - 68

DOI: https://doi.org/10.2478/pjct-2023-0009

KeywordsRubidium, Ionic liquid, Dicyclohexano-18-crown-6, Solvent extraction

© 2023 Dongfang Huang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Rubidium, Ionic liquid, Dicyclohexano-18-crown-6, Solvent extraction