Kinetic and thermodynamic study of the Na4(UO2)2(OH)4(C2O4)2 complex

✍ Scribed by Fabrizio Rodante; Stefano Vecchio; Stefano Materazzi; Ermanno Vasca

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 126 KB
• Volume: 35
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.10166

✦ Synopsis

The synthesis, the characterization, and the thermal decomposition of the dioxouranium(VI) ternary complex of formula Na 4 (UO 2 ) 2 (OH) 4 (C 2 O 4 ) 2 , has been studied. The identification of the compound was performed by chemical analysis and infrared spectrometry. Thermal decomposition of the compound occurs in several steps due to the decomposition of the salt to Na 2 O and UO 3 oxides. The stoichiometry of the steps, hypothesized by means of the thermodynamic and kinetic parameters, is confirmed by the evolved gas analysis studied by FTIR spectrometer coupled to TG/DSC apparatus.

Model-fitting and model-free kinetic methods have been used in kinetic analysis. The latter allows determining kinetic scheme.