Uptake properties of palladium for biopolymer microcapsules enclosing Cyanex 302 extractant

Hitoshi Mimura, Hiroshi Ohta, Harutaka Hoshi, Kenichi Akiba, Yoshio Onodera

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


An extractant having a strong affinity for palladium, bis(2,4,4-trimethylpentyl) monothiophosphinic acid (Cyanex 302), was enclosed into microcapsules by mixing with a biopolymer, calcium alginate gel polymer. The uptake of Pd2+ and other metal ions in the microcapsules was investigated; a relatively large distribution coefficient of Pd2+, Kd, Pd, of above 103 cm3/g was obtained around 0.1 M HNO3, and there was a large difference in Kd value between Pd2+ and other metal ions. The uptake of Pd2+ on microcapsules followed a Langmuir-type uptake isotherm. The microcapsules were packed into a column and then a separation of Pd2+ was performed.

Original languageEnglish
Pages (from-to)31-44
Number of pages14
JournalSeparation Science and Technology
Issue number1
Publication statusPublished - 2001 Feb 13


  • Alginate gel
  • Biopolymer
  • Cyanex 302
  • Microcapsule
  • Palladium
  • Separation factor
  • Uptake

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation


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