Evaluation study on properties of isohexyl-BTP/SiO 2-P resin for direct separation of trivalent minor actinides from HLLW

Ruiqin Liu, Yuezhou Wei, Shigekazu Usuda, Hiromichi Yamazaki, Yuanlai Xu, Seongyun Kim, Keizo Ishii

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

In order to develop a direct separation process for trivalent minor actinides from fission products in high level liquid waste (HLLW) by extraction chromatography, a novel macroporous silica-based 2,6-bis(5,6-diisohexyl)1,2,4- triazin-3-yl)pyridine resin (isohexyl-BTP/SiO 2-P resin) was prepared. The content of isohexyl-BTP extractant in the resin was as high as 33.3 wt%. The resin exhibited much higher adsorption affinity for Am(III) in 2-3 M (mol/L) HNO 3 solution over U and FP which are contained in HLLW. The kinetic data were analyzed using pseudo-second-order equation. The results suggested that the Eu(III), Gd(III), and Dy(III) adsorption was well explained by the pseudo-second-order equation. Quantitative desorption for adsorbed elements was achieved by using H 2O or thiourea as eluting agents. However, the kinetics of adsorption and desorption were rather slow and this drawback needs to be resolved. Stability of the resin against HNO 3 was also examined. It was found that the resin was considerably stable against ≤4 M HNO 3 solution for the reasons of an extremely small leakage of the extractant into the solution from the resin and the adsorption performance keeping for rare earths in 3 M HNO 3 solution.

Original languageEnglish
Pages (from-to)537-544
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume291
Issue number2
DOIs
Publication statusPublished - 2012 May 1

Keywords

  • Extraction chromatography
  • Fission products
  • HLLW
  • Isohexyl-BTP/SiO -P
  • Minor actinides
  • Rare earths

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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