Solvent Extraction of Trivalent Rare Earth Metal Ions with Carboxylate Derivatives of Calixarenes

Keisuke Ohto, Masayuki Yano, Katsutoshi Inoue, Seiji Shinkai

Research output: Contribution to journalArticle

125 Citations (Scopus)

Abstract

As novel calixarene or macrocyclic types of extradants, 37,38,39,40,41,42-hexakis(carboxymethoxy)-5,11,17,23,29,35-hexakis(l, 1,3,3-tetramethylbutyl)calix[6]arene and 25,26,27,28-tetrakis(carboxymethoxy)-5,11,17,23-tetrakis(l, 1,3,3-tetramethylbutyl)calix[4]arene as well asp-(1,1,3,3-tetramethylbutyl)phenoxy acetic acid, as their monoraeric analog, and 2,6-bis[2-carboxymethoxy-5-{ 1,1,3,3-tetramethylbuty l)benzyl]-4-(1,1,3,3-tetramethylbutyl)phenoxyacetic acid as a linear trimer analog, have been synthesized in order to investigate their extraction abilities of rare earth metal ions, RE3+ (RE=Y, La, Pr, Nd, Sm, Eu, Gd, Ho, Er), from an aqueous nitrate solution. It was found that the calixarene derivatives provide much higher extractability and greater separation efficiency than do the monomeric analog and the other acidic carboxylate extradants. The selectivity for rare earth elements in this system is not affected by the ring size. In extraction from an aqueous mixture of nitric acid-glycine, the stoichiometry of the extracted species was determined and the extraction equilibrium constants as well as the separation factors were evaluated for each extradant. A stripping test was also performed and the stripping of rare earths was found to be successfully achieved with diluted hydrochloric acid.

Original languageEnglish
Pages (from-to)893-902
Number of pages10
JournalAnalytical Sciences
Volume11
Issue number6
DOIs
Publication statusPublished - Jan 1 1995

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Rare Earth Metals
Calixarenes
Solvent extraction
Metal ions
Derivatives
Nitric Acid
Hydrochloric Acid
Equilibrium constants
Rare earth elements
Stoichiometry
Acetic Acid
Nitrates
Glycine
Rare earths

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Solvent Extraction of Trivalent Rare Earth Metal Ions with Carboxylate Derivatives of Calixarenes. / Ohto, Keisuke; Yano, Masayuki; Inoue, Katsutoshi; Shinkai, Seiji.

In: Analytical Sciences, Vol. 11, No. 6, 01.01.1995, p. 893-902.

Research output: Contribution to journalArticle

Ohto, Keisuke ; Yano, Masayuki ; Inoue, Katsutoshi ; Shinkai, Seiji. / Solvent Extraction of Trivalent Rare Earth Metal Ions with Carboxylate Derivatives of Calixarenes. In: Analytical Sciences. 1995 ; Vol. 11, No. 6. pp. 893-902.
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