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1 2006

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Study of Permanganate Ion Transfer Across an Electrified Water/Nitrobenzene Interface

Heli H., Shamsipur M., Mousavi M.

Polish Journal of Chemistry

2006

Vol. 80, nr 2

313-323

The transfer of permanganate anion across a water/nitrobenzene interface has been studied by cyclic voltammetry and chronopotentiometry techniques. The diffusion coefficient of the species in aqueous phase was obtained by means of both cyclic voltammetry (DW = 2.75x10-5cm2 s-1) and chronopotentiometry (DW = 2.79x10-5cm2 s-1). The standard potential of transfer was obtained as deltaE0' = -198 mVand the transfer coefficient has also been calculated from the Tafel slope as alfa = 0.4. The effect of temperature on the ion transfer process was studied over a wide range (10-70 graduate C). The Gibbs activation energy of the ion transfer across the interface (deltaG = 12.09 kJ mol-1) and the Gibbs activation energy of ion transport in the bulk of aqueous solution (deltaG = 12.58 kJ mol-1) have been obtained from the temperature dependence of transfer rate data.