Study on separation of Eu(II) from trivalent rare earths via electro-reduction and ion exchange

Ludek Jelinek, Yuezhou Wei, Tsuyoshi Arai, Mikio Kumagai

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13 Citations (Scopus)

Abstract

Separation of Eu(II) from trivalent rare earths was carried out in 0.01 mol dm-3 hydrochloric acid medium. Eu(III) was selectively reduced to Eu(II) at glassy carbon cathode in flow type electrolyzer. For Eu(II) separation strong acid cation exchanger based on sulfonated polystyrene/DVB copolymer impregnated into porous silica beads was used. Breakthrough and chromatography curves were measured. Eu(II) exhibited lower affinity towards the sorbent than trivalent rare earths and therefore it was the first species to breakthrough the column. Excellent separation from middle rare earths was achieved while the separation from heavy rare earths was difficult. The back-oxidation of Eu(II) was a problem despite all the measures that were taken to prevent oxidation by dissolved oxygen and photo-oxidation.

Original languageEnglish
Pages (from-to)341-343
Number of pages3
JournalJournal of Alloys and Compounds
Volume451
Issue number1-2
DOIs
Publication statusPublished - 2008 Feb 28

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Keywords

  • Electro-reduction
  • Eu
  • Glassy carbon cathode
  • Separation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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