Startseite Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes
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Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

  • Rajesh B. Gujar , Parveen K. Verma , Prasanta K. Mohapatra EMAIL logo , Mudassir Iqbal , Jurriaan Huskens und Willem Verboom EMAIL logo
Veröffentlicht/Copyright: 19. Januar 2021
Radiochimica Acta
Aus der Zeitschrift Radiochimica Acta Band 109 Heft 3

Abstract

Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO22+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as LI, LII and LIII, respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO22+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: LII > LI > LIII, which changed to LIII > LII > LI for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO22+ was marginally better extracted then UO22+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

Keywords: diglycolamide calix[4]arenes; extraction; neptunium; plutonium; separation
Corresponding authors: Prasanta K. Mohapatra, Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai400085, India, E-mail: ; and Willem Verboom, Laboratory of Molecular Nanofabrication, MESA+ Institute of Nanotechnology, University of Twente, 7500 AEEnschede, Netherlands, E-mail:

Acknowledgments

The authors (RBG, PKV and PKM) thank Dr. P.K. Pujari, Head, Radiochemistry Division, Bhabha Atomic Research Centre for his constant encouragement.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

  4. Supporting information: Purification radiotracers.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/ract-2020-0100).

Received: 2020-09-25
Accepted: 2020-12-17
Published Online: 2021-01-19
Published in Print: 2021-03-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Original Papers
  3. Gas phase synthesis of 4d transition metal carbonyl complexes with thermalized fission fragments in single-atom reactions
  4. Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes
  5. Uranyl oxalate species in high ionic strength environments: stability constants for aqueous and solid uranyl oxalate complexes
  6. Comparative study on aqueous acid free UO2 dissolution-extraction using DHOA adduct into room temperature ionic liquid/supercritical carbon dioxide/n-hexane
  7. Determination of trace uranium in thorium matrix by laser induced fluorimetry after separation of thorium by its fluoride precipitation using NH4HF2
  8. Development of a fast characterization setup for radionuclide generators demonstrated by a 227Ac-based generator
  9. Purification of 89Sr from FBTR irradiated Yttria target by extraction chromatography using HDEHP impregnated XAD-7 resin
  10. Microanalysis and signature of rare earth elements in geochemical samples using neutron activation analysis
https://doi.org/10.1515/ract-2020-0100
Schlagwörter für diesen Artikel
diglycolamide calix[4]arenes; extraction; neptunium; plutonium; separation

Artikel in diesem Heft

  1. Frontmatter
  2. Original Papers
  3. Gas phase synthesis of 4d transition metal carbonyl complexes with thermalized fission fragments in single-atom reactions
  4. Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes
  5. Uranyl oxalate species in high ionic strength environments: stability constants for aqueous and solid uranyl oxalate complexes
  6. Comparative study on aqueous acid free UO2 dissolution-extraction using DHOA adduct into room temperature ionic liquid/supercritical carbon dioxide/n-hexane
  7. Determination of trace uranium in thorium matrix by laser induced fluorimetry after separation of thorium by its fluoride precipitation using NH4HF2
  8. Development of a fast characterization setup for radionuclide generators demonstrated by a 227Ac-based generator
  9. Purification of 89Sr from FBTR irradiated Yttria target by extraction chromatography using HDEHP impregnated XAD-7 resin
  10. Microanalysis and signature of rare earth elements in geochemical samples using neutron activation analysis
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