EVALUATION OF THERMODYNAMIC ACTIVATION PARAMETERS OF COBALT ORTHOVANADATE MEMBRANE

Badrul Islam, Sanadelaslam Elhaddad
2012 Int. J. Chem. Sci   unpublished
In the present work, the preparation of parchment supported cobalt orthovanadate membrane has been described. The ion transport through the membrane has been computed using the Kittelberger's equation based on the simple laws of electrolysis. The assembly used provides the data for various membrane parameters like membrane resistance, membrane potential and the diffusion rate of ions within a very short period, i.e. within two-three minutes, with reasonable accuracy. By applying the theory of
more » ... ing the theory of absolute reaction rate, various thermodynamic parameters, namely, enthalpy of activation ∆H ≠ , energy of activation ∆F ≠ , and entropy of activation ∆S ≠ were evaluated. The ∆S ≠ values were found to be negative, indicating that diffusion takes place with partial immobilization in the membrane phase. A formal relation between ∆F hydration , ∆H hydration and ∆S hydration of cations with corresponding values of ∆F ≠ , ∆H ≠ and ∆S ≠ for diffusion was also worked out.
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