Microanalysis of silica-based adsorbent for effective recovery of radioactive elements

Yuichi Sano, Sou Watanabe, Haruaki Matsuura, Kohei Nagoshi, Tsuyoshi Arai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

For effective recovery of radioactive elements by adsorbents using polymer-immobilized silica (SiO2-P) supports, the microstructure of SiO2-P particles impregnated with octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide as extractants and their change with the crosslinking degree of polymer (CDP) were investigated using scanning transmission X-ray microscopy (STXM) and extended X-ray absorption fine structures (EXAFS) analyses; further, their relation with adsorption/elution behavior was discussed. The results of STXM analysis suggested that the polymer is distributed within several hundred nanometers of the pore surface, and its distributions are spread by the increase of CDP. In addition, the capture of impurity molecules such as H2O by polymers with high CDP was indicated. EXAFS analyses showed that the local structure around adsorbed europium ions is similar irrespective of the CDP. The adsorption/elution tests demonstrated that a higher CDP inhibited the elution of adsorbed europium ions from the adsorbent.

Original languageEnglish
Pages (from-to)1058-1064
Number of pages7
JournalJournal of Nuclear Science and Technology
Volume54
Issue number10
DOIs
Publication statusPublished - 2017 Oct 3

Keywords

  • Adsorbent
  • CMPO
  • elution
  • EXAFS
  • minor actinide
  • silica
  • STXM

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

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