Palladium removal from the simulated nuclear spent fuel solution using a silica-based SiPyR-N3 anion exchanger

Anyun Zhang, Yuezhou Wei, Tsuyoshi Arai, Mikio Kumagai

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The ERIX process consists of electroreduction and anion exchange for reprocessing spent nuclear fuels, in which Pd removal from spent fuel solution is necessary in the first step, since Pd can deposit at the electrode in the metallic state and interfere with the electroreduction. In the present work, the possibility in selective removal of Pd using a porous silica-supported anion exchanger, SiPyR-N3, containing a pyridine group has been studied. Adsorption behavior of Pd(II) from a simulated solution using a SiPyR-N3 packed column has been investigated. The elution of Pd(II) using 0.05 M DTPA and 0.2 M thiourea was examined and compared. The SiPyR-N3 resin showed a significantly strong adsorption for Pd(II) from HNO3 solution. The unique adsorption was considered to result from the complex formation between Pd(II) and the resin which contains the soft-atom N with a lone pair of electrons. U(VI) and some typical simulated fission products, La(III), Pr(III), and Sr(II), showed almost no or very weak adverse impact on the Pd(II) separation, except for Re(VII) and Ru(III). The results of column experiments demonstrated that the Pd can be selectively removed from the nuclear spent fuel solution, though further work is needed to improve Pd elution.

Original languageEnglish
Pages (from-to)447-462
Number of pages16
JournalSolvent Extraction and Ion Exchange
Issue number3
Publication statusPublished - 2006
Externally publishedYes


  • ERIX process
  • Pd removal
  • Porous silica-based anion exchanger
  • Spent nuclear fuel

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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