alexa Part XV Physicochemical properties of uranyl alginate complex especially the chemical equilibrium and electrical conductivity related to the coordination geometry
Chemical Engineering

Chemical Engineering

Journal of Advanced Chemical Engineering

Author(s): R M Hassan, Y Ikeda, H Tomiyasu

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The heterogeneous equilibrium for exchange of UO22+ 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 UO22+ chelated to the alginate macromolecular chains, and displayed γa CO2− and γs CO2− in the ranges of 1591 and 1410 cm−1 respectively. Two geometrical structures for chelation of UO22+ with the functional groups of alginate macromolecules have been suggested.

This article was published in Journal of Materials Science and referenced in Journal of Advanced Chemical Engineering

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