A Striking effect of ionic-liquid anions in the extraction of Sr2+ and Cs+ by dicyclohexano-18-crown-6

H. Luo; S. Dai; P. V. Bonnesen; T. J. Haverlock; Bruce A. Moyer; A. C. Buchanan

doi:10.1080/07366290500388624

A Striking effect of ionic-liquid anions in the extraction of Sr²⁺ and Cs⁺ by dicyclohexano-18-crown-6

H. Luo, S. Dai, P. V. Bonnesen, T. J. Haverlock, Bruce A. Moyer, A. C. Buchanan

Research output: Contribution to journal › Article › peer-review

113 Scopus citations

Abstract

The nature of the ionic-liquid (IL) anion has been found to have a remarkable effect on the solvent extraction of Sr²⁺ and Cs⁺ by dicyclohexano-18-crown-6 dissolved in ionic liquids. In particular, the extraction efficiency increases with the hydrophobicity of the IL anion as reflected by the solubility in water of ILs having a common cation. Since a cation-exchange mechanism is operating in these systems, the influence of the IL anion is in large part attributable to an expected Le Chatelier effect in which a greater aqueous concentration of IL cation, obtained when using an IL anion of lower hydrophobicity, opposes cation exchange. This dependence is opposite to that found for IL cations, indicating a significant advantage of using ILs with hydrophobic anions for cation extraction. Furthermore, the extraction selectivity for Sr²⁺ over Na⁺, K⁺, and Cs⁺ can be significantly improved through the use of hydrophobic anions for the ILs containing 1-ethyl-3-methylimidazolium or 1-butyl-3-methylimidazolium cations.

Original language	English
Pages (from-to)	19-31
Number of pages	13
Journal	Solvent Extraction and Ion Exchange
Volume	24
Issue number	1
DOIs	https://doi.org/10.1080/07366290500388624
State	Published - 2006

Keywords

Anion effect
Crown ethers
Ionic liquids
Solvents extraction

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10.1080/07366290500388624

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title = "A Striking effect of ionic-liquid anions in the extraction of Sr2+ and Cs+ by dicyclohexano-18-crown-6",

abstract = "The nature of the ionic-liquid (IL) anion has been found to have a remarkable effect on the solvent extraction of Sr2+ and Cs+ by dicyclohexano-18-crown-6 dissolved in ionic liquids. In particular, the extraction efficiency increases with the hydrophobicity of the IL anion as reflected by the solubility in water of ILs having a common cation. Since a cation-exchange mechanism is operating in these systems, the influence of the IL anion is in large part attributable to an expected Le Chatelier effect in which a greater aqueous concentration of IL cation, obtained when using an IL anion of lower hydrophobicity, opposes cation exchange. This dependence is opposite to that found for IL cations, indicating a significant advantage of using ILs with hydrophobic anions for cation extraction. Furthermore, the extraction selectivity for Sr2+ over Na+, K+, and Cs+ can be significantly improved through the use of hydrophobic anions for the ILs containing 1-ethyl-3-methylimidazolium or 1-butyl-3-methylimidazolium cations.",

keywords = "Anion effect, Crown ethers, Ionic liquids, Solvents extraction",

author = "H. Luo and S. Dai and Bonnesen, {P. V.} and Haverlock, {T. J.} and Moyer, {Bruce A.} and Buchanan, {A. C.}",

year = "2006",

doi = "10.1080/07366290500388624",

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T1 - A Striking effect of ionic-liquid anions in the extraction of Sr2+ and Cs+ by dicyclohexano-18-crown-6

AU - Luo, H.

AU - Dai, S.

AU - Bonnesen, P. V.

AU - Haverlock, T. J.

AU - Moyer, Bruce A.

AU - Buchanan, A. C.

PY - 2006

Y1 - 2006

N2 - The nature of the ionic-liquid (IL) anion has been found to have a remarkable effect on the solvent extraction of Sr2+ and Cs+ by dicyclohexano-18-crown-6 dissolved in ionic liquids. In particular, the extraction efficiency increases with the hydrophobicity of the IL anion as reflected by the solubility in water of ILs having a common cation. Since a cation-exchange mechanism is operating in these systems, the influence of the IL anion is in large part attributable to an expected Le Chatelier effect in which a greater aqueous concentration of IL cation, obtained when using an IL anion of lower hydrophobicity, opposes cation exchange. This dependence is opposite to that found for IL cations, indicating a significant advantage of using ILs with hydrophobic anions for cation extraction. Furthermore, the extraction selectivity for Sr2+ over Na+, K+, and Cs+ can be significantly improved through the use of hydrophobic anions for the ILs containing 1-ethyl-3-methylimidazolium or 1-butyl-3-methylimidazolium cations.

AB - The nature of the ionic-liquid (IL) anion has been found to have a remarkable effect on the solvent extraction of Sr2+ and Cs+ by dicyclohexano-18-crown-6 dissolved in ionic liquids. In particular, the extraction efficiency increases with the hydrophobicity of the IL anion as reflected by the solubility in water of ILs having a common cation. Since a cation-exchange mechanism is operating in these systems, the influence of the IL anion is in large part attributable to an expected Le Chatelier effect in which a greater aqueous concentration of IL cation, obtained when using an IL anion of lower hydrophobicity, opposes cation exchange. This dependence is opposite to that found for IL cations, indicating a significant advantage of using ILs with hydrophobic anions for cation extraction. Furthermore, the extraction selectivity for Sr2+ over Na+, K+, and Cs+ can be significantly improved through the use of hydrophobic anions for the ILs containing 1-ethyl-3-methylimidazolium or 1-butyl-3-methylimidazolium cations.

KW - Anion effect

KW - Crown ethers

KW - Ionic liquids

KW - Solvents extraction

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DO - 10.1080/07366290500388624

M3 - Article

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SN - 0736-6299

VL - 24

SP - 19

EP - 31

JO - Solvent Extraction and Ion Exchange

JF - Solvent Extraction and Ion Exchange

IS - 1

ER -

A Striking effect of ionic-liquid anions in the extraction of Sr²⁺ and Cs⁺ by dicyclohexano-18-crown-6

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Keywords

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