Selective uptake and recovery of palladium by biopolymer microcapsules enclosing cyanex 302 extractant

Hitoshi Mimura, Hiroshi Ohta, Kenichi Akiba, Yoshio Onodera

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42 Citations (Scopus)


Selective uptake and recovery of platinum group metals are an important subject in the high level liquid waste treatment. An extractant having a strong affinity for palladium, bis(2,4,4-trimethylpentyl) monothiophosphinic acid (Cyanex 302, HA), was enclosed into microcapsules by utilizing highly immobilizing ability of biopolymer (alginate and alginic acid gel polymers). The uptake of Pd2plus, Ru(NO)3+ and Rh3+ for granular microcapsules has been studied by batch and column methods. A relatively large distribution coefficient of Pd2plus, Kd, Pd, of above 104 cm3/g was obtained in the presence of 0.2–0.5 M HNO3 and the separation factors of Pd/Ru and Pd/Rh were estimated to be above 102. The uptake of Pd2+ on microcapsules followed a Langmuir-type uptake isotherm and the maximum uptake capacity was estimated to be 0.72–0.96 mmol/g. These metal cations were chromatographically separated through the column packed with HA-alginate microcapsules.

Original languageEnglish
Pages (from-to)342-348
Number of pages7
Journaljournal of nuclear science and technology
Issue number5
Publication statusPublished - 2001 May
Externally publishedYes


  • Alginate
  • Biopolymer
  • Breakthrough curve
  • Chromatographic separation
  • Cyanex 302
  • Distribution coefficient
  • Extraction columns
  • Isotherm
  • Microcapsule
  • Palladium
  • Recovery
  • Separation factor
  • Uptake

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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