A comparative study of ionic liquids and a conventional organic solvent on the extraction of rare-earth ions with TOPO

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Abstract

A comparative study of ionic liquids (ILs) and a conventional organic solvent on the extraction of rare-earth ions from a nitrate-contained solution with TOPO has been investigated. A slope analysis was carried out to determine the extraction mechanism, and it was found that more TOPO molecules and the ionic constituents of the ILs have taken part in the extraction reaction in the ILs-based TOPO extraction systems. The numbers of TOPO molecules coordinated to the metal ion in the extracted complexes were 6 and 4 in the [C4mim] and [C8mim][Tf2N] systems, although 3 TOPO molecules were needed in the n-dodecane system. Higher extraction efficiency was obtained in the extraction system in which the higher coordinating number of TOPO was shown. The extraction ability of [C8mim][Tf2N]-based TOPO depends significantly on the ionic constituents of the ILs in the extracting phase, but depends only slightly on the anionic nitrate ion from the aqueous phase, and [C4mim][Tf2N]-based TOPO is not dependent on the nitrate ion.

Original languageEnglish
Pages (from-to)225-232
Number of pages8
JournalSolvent Extraction Research and Development
Volume20
DOIs
Publication statusPublished - Jan 1 2013

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Ionic Liquids
Ionic liquids
Organic solvents
Rare earths
Ions
Nitrates
Molecules
trioctyl phosphine oxide
Metal ions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "A comparative study of ionic liquids and a conventional organic solvent on the extraction of rare-earth ions with TOPO",
abstract = "A comparative study of ionic liquids (ILs) and a conventional organic solvent on the extraction of rare-earth ions from a nitrate-contained solution with TOPO has been investigated. A slope analysis was carried out to determine the extraction mechanism, and it was found that more TOPO molecules and the ionic constituents of the ILs have taken part in the extraction reaction in the ILs-based TOPO extraction systems. The numbers of TOPO molecules coordinated to the metal ion in the extracted complexes were 6 and 4 in the [C4mim] and [C8mim][Tf2N] systems, although 3 TOPO molecules were needed in the n-dodecane system. Higher extraction efficiency was obtained in the extraction system in which the higher coordinating number of TOPO was shown. The extraction ability of [C8mim][Tf2N]-based TOPO depends significantly on the ionic constituents of the ILs in the extracting phase, but depends only slightly on the anionic nitrate ion from the aqueous phase, and [C4mim][Tf2N]-based TOPO is not dependent on the nitrate ion.",
author = "Fan Yang and Fukiko Kubota and Noriho Kamiya and Masahiro Goto",
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T1 - A comparative study of ionic liquids and a conventional organic solvent on the extraction of rare-earth ions with TOPO

AU - Yang, Fan

AU - Kubota, Fukiko

AU - Kamiya, Noriho

AU - Goto, Masahiro

PY - 2013/1/1

Y1 - 2013/1/1

N2 - A comparative study of ionic liquids (ILs) and a conventional organic solvent on the extraction of rare-earth ions from a nitrate-contained solution with TOPO has been investigated. A slope analysis was carried out to determine the extraction mechanism, and it was found that more TOPO molecules and the ionic constituents of the ILs have taken part in the extraction reaction in the ILs-based TOPO extraction systems. The numbers of TOPO molecules coordinated to the metal ion in the extracted complexes were 6 and 4 in the [C4mim] and [C8mim][Tf2N] systems, although 3 TOPO molecules were needed in the n-dodecane system. Higher extraction efficiency was obtained in the extraction system in which the higher coordinating number of TOPO was shown. The extraction ability of [C8mim][Tf2N]-based TOPO depends significantly on the ionic constituents of the ILs in the extracting phase, but depends only slightly on the anionic nitrate ion from the aqueous phase, and [C4mim][Tf2N]-based TOPO is not dependent on the nitrate ion.

AB - A comparative study of ionic liquids (ILs) and a conventional organic solvent on the extraction of rare-earth ions from a nitrate-contained solution with TOPO has been investigated. A slope analysis was carried out to determine the extraction mechanism, and it was found that more TOPO molecules and the ionic constituents of the ILs have taken part in the extraction reaction in the ILs-based TOPO extraction systems. The numbers of TOPO molecules coordinated to the metal ion in the extracted complexes were 6 and 4 in the [C4mim] and [C8mim][Tf2N] systems, although 3 TOPO molecules were needed in the n-dodecane system. Higher extraction efficiency was obtained in the extraction system in which the higher coordinating number of TOPO was shown. The extraction ability of [C8mim][Tf2N]-based TOPO depends significantly on the ionic constituents of the ILs in the extracting phase, but depends only slightly on the anionic nitrate ion from the aqueous phase, and [C4mim][Tf2N]-based TOPO is not dependent on the nitrate ion.

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