High-resolution separation of neodymium and dysprosium ions utilizing extractant-impregnated graft-type particles

Shoichiro Uchiyama, Takaaki Sasaki, Ryo Ishihara, Kunio Fujiwara, Takanobu Sugo, Daisuke Umeno, Kyoichi Saito*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


An efficient method for rare metal recovery from environmental water and urban mines is in high demand. Toward rapid and high-resolution rare metal ion separation, a novel bis(2-ethylhexyl) phosphate (HDEHP)-impregnated graft-type particle as a filler for a chromatography column is proposed. To achieve rapid and high-resolution separation, a convection-flow-aided elution mode is required. The combination of 35 μm non-porous particles and a polymer-brush-rich particle structure minimizes the distance from metal ion binding sites to the convection flow in the column, resulting in minimized diffusional mass transfer resistance and the convection-flow-aided elution mode. The HDEHP-impregnated graft-type non-porous-particle-packed cartridge developed in this study exhibited a higher separation performance for model rare metals, neodymium (III) and dysprosium (III) ions, and a narrower peak at a higher linear velocity, than those of previous HDEHP-impregnated fiber-packed and commercially available Lewatit® VP OC 1026-packed cartridges.

Original languageEnglish
Pages (from-to)10-16
Number of pages7
JournalJournal of Chromatography A
Publication statusPublished - 2018 Jan 19
Externally publishedYes


  • Extractant
  • High-resolution separation
  • Non-porous particles
  • Polymer brush and root
  • Radiation-beam-induced graft polymerization
  • Rare metals

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry


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