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Journal of Materials Science

, Volume 28, Issue 19, pp 5143–5147 | Cite as

Alginate polyelectrolyte ionotropic gels

Part XV Physicochemical properties of uranyl alginate complex especially the chemical equilibrium and electrical conductivity related to the coordination geometry
  • R. M. Hassan
  • Y. Ikeda
  • H. Tomiyasu
Papers

Abstract

The heterogeneous equilibrium for exchange of UO 2 2+ counter-ions in uranyl alginate exchange resin by H+ ions has been investigated using titrimetric and spectrophotometric techniques. The thermodynamic equilibrium constant was found to be 15.51±0.33 at 25 °C. The electrical conductivity of uranyl alginate in the form of circular discs has been examined as a function of temperature. The Arrhenius plot of log δ versus 1/T showed a complicated behaviour where three regions of conduction were separated by two distinct transition zones. This behaviour was interpreted by the transfer of electrons from alginate to the cross-linked uranyl ion with formation of free radicals and uranium ions of lower oxidation states in a sequence, followed by dimerization of these radicals in the final stages. The X-ray diffraction pattern indicated that the uranyl alginate complex is amorphous in nature. Infrared absorption spectra indicated the presence of UO 2 2+ chelated to the alginate macromolecular chains, and displayed γa CO 2 and γs CO 2 in the ranges of 1591 and 1410 cm−1 respectively. Two geometrical structures for chelation of UO 2 2+ with the functional groups of alginate macromolecules have been suggested.

Keywords

Uranium Alginate Uranyl Exchange Resin Arrhenius Plot 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • R. M. Hassan
    • 1
  • Y. Ikeda
    • 2
  • H. Tomiyasu
    • 3
  1. 1.Chemistry Department, Faculty of ScienceAssiut UniversityAssiutEgypt
  2. 2.Nuclear Chemistry and Chemical Engineering CentreInstitute of Research and InnovationChibaJapan
  3. 3.Research Laboratory for Nuclear ReactorsTokyo Institute of TechnologyTokyoJapan

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