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Title: Facilitated Ion Transfer across the Membrane Stabilized Interface between Two Immiscible Electrolyte Solutions
???metadata.dc.contributor.*???: Dr. B. Hundhammer
Dr. Theodros Solomon
Zeryihun, Leul
Issue Date: Jun-1993
Publisher: Addis Ababa University
Abstract: The transfer of Ni24, Cd24 and Fe24 facilitated by 2,2 t-bipyridine and Ni(bipy)32+ complex ion transfer across the membrane stabilized interface between two immiscible electrolyte solutions (water/nitrobenzene) was studied using the flow action technique, and do ac 'Cyclic voltamikry. fl'low injection analysis the dependence of peak current height on the applied potential all, with the exception of Ni2+, showed an S-shaped polarographic wave with fairly sharp i-t curves, indicating the reversible or diffusion controlled transfer of these ions. Nit} showed poor current-potential dependence with a hardly discernible half-wave potential. The i-t curve was very broad which shows that the transfer of Ni2+ is kinetically controlled. Similarly the ac cyclic voltammogram of Cd2t, Fe2t and Ni(bipy)324 showed reversible behaviour with overlapping forward and reverse peak potentials and half-peak width of m45 mv. In the ac cyclic voltammogram for the transfer of Nit} the peak potential for the forward and reverse scans did not overlap, indicating kinetically controlled transfer. The reversible transfer of the Ni(bipy)l complex was studied by single sweep voltammetry and the diffusion coefficient of the ion in water was evaluated. In the ac voltammetric experiment only the transfer of the bis and tris complex was within the range of the potential window. The transfer of Ni2+ and Fe2+ are presumed to be a complex ion transfer while that of Cd24 appears to be a facilitated ion transfer of Cd24 may occur in the bulk phase. The change in standard Gibbs energy of transfer between the successive complexes of Nit} and Fe2+ was about 38.6 Krymol while that of Ce was very large (53 KJ/mol).
Description: A Thesis Presented to the School of Graduate Studies Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Chemistry
Appears in Collections:Thesis - Chemistry

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