Department of Chemistry, College of sciences, Payam Noor University, 19395-4697 Tehran, Iran.
Abstract
The redox properties of sulfite ion has been examind using cyclic voltammetry in acetonitrile solvent at the surface of gold, pelatin and glassy carbon electrodes. It has bben found tha, sulfite ion exhibits two electron oxidation peak with EC’ mechanism. A novel chemically modified electrode containing Prussian blue complex and multi wall carbon nanotubes (MWCNs) was achieved on the surface of glassy carbon electrode by sol-gel technique. The electrochemical behavior of modified electrode was characterized by cyclic voltammetry in detail. The film electrode obtained was very stable and exhibited electrocatalytic response for oxidation of sulfite. Results showed at bare GC electrode, a small oxidation peak current was observed at about 0.663mV and a well-formed sharp catalytic oxidation peak was observed at Prussian blue complex modified electrode. The transfer coefficient (α) for electrocatalytic oxidation of sulfite and the diffusion coefficient of this substance under the experimental conditions were also investigated.
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