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Mutual Separation of Fe(II) and Fe(III) Using Cyclohexane/Water/Ionic-liquid Triphasic Extraction System with 2,2'-Bipyridine and Tri-n-octylphosphine Oxide.

Authors
  • Toita, Mizuki1
  • Morita, Kotaro1
  • Hirayama, Naoki1
  • 1 Department of Chemistry, Faculty of Science, Toho University.
Type
Published Article
Journal
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry
Publication Date
Nov 10, 2020
Volume
36
Issue
11
Pages
1387–1391
Identifiers
DOI: 10.2116/analsci.20P198
PMID: 32684531
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The triphasic extraction system with two extract phases can be used to separate two materials simultaneously into each phase. In this article, a possible mutual separation of Fe(II) and Fe(III) was studied using the cyclohexane/water/ionic liquid (IL) triphasic extraction system for Fe speciation. For Fe(II) and Fe(III) extraction, 2,2'-bipyridine (bpy) and tri-n-octylphosphine oxide (TOPO) were selected as extractants, respectively. It was suggested that [FeII(bpy)3]2+ and FeIII(TOPO)43+·3Tf2N- were extracted into the IL (1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, C4mimTf2N) phase and the cyclohexane phase, respectively, and both of the extractants also acted as masking agents. On simultaneous separation using the triphasic system, Fe(II) and Fe(III) were quantitatively extracted into the IL phase and the cyclohexane phase, respectively, and their mutual separation was achieved.

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