Thermodynamics of cesium extraction from acidic media by HCCD and PEG

R. Scott Herbst, Dean R. Peterman, Peter R. Zalupski, Ken L. Nash, Richard D. Tillotson, Lætitia H. Delmau

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this study, details of cesium extraction from nitrate media using chlorinated cobalt dicarbollide (HCCD) dissolved in the polar phenyl trifluoromethyl sulfone (FS-13) diluent have been examined. It has been verified that Cs+ phase transfer is based solely on cation exchange (H+ for Cs+) that is, that a previously reported nitrate dependency arises from nonideal behavior of solute species. The enthalpy and entropy of the system calculated using appropriate corrections to the van't Hoff analysis are found to be in good agreement with independently measured calorimetry results. Finally, it is demonstrated that synergistic extraction of Cs+ by HCCD and PEG does not occur. Although there is a definite interaction between HCCD and PEG (and it is well established that this interaction is responsible for the extraction of Sr2+), this association is actually antagonistic to the extraction of Cs+.

Original languageEnglish
Pages (from-to)563-578
Number of pages16
JournalSolvent Extraction and Ion Exchange
Volume28
Issue number5
DOIs
StatePublished - 2010

Funding

This research was sponsored by the Laboratory Directed Research and Development Program, U.S. Department of Energy, under DOE Idaho Operations Office contract DE-AC07-99ID13727 with Idaho National Laboratory, managed by Battelle Energy Alliance, LLC.

Keywords

  • Cesium
  • FS-13
  • HCCD
  • PEG
  • SXLSQI mode
  • Solvent extraction

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