Electrocatalytic Oxidation Study of Theophylline on a Copper Nanoparticles-Modified Carbon Paste Electrode on the Basis of Cyclic Voltammetry

Document Type: Research Article

Authors

1 Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN

2 Depertment of Chemistry, Lahijan Branch, Islamic Azad University, Lahijan, I.R. IRAN

3 Depertment of Chemistry, Shahrood Branch, Islamic Azad University, Shahrood, I.R. IRAN

Abstract

ABSTRACT: In this study the Cu nanoparticles were prepared by reducing CuSO4. These particles were used in making copper nanoparticles modified carbon paste electrode (nano-CPE ). The electrochemical characteristics of this electrode (nano-CPE ) were investigated. The results of the electrocatalytic oxidation of theophylline (TP ) on nano-CPE, using cyclic voltammetry technique showed that nano-CPE, has more reactivity and more effective surface area, as compared to the unmodified carbon paste electrode (un-CPE ). The investigation of voltammograms obtained from oxidation of TP at different scan rates on the nano-CPE, confirmed a cyclic mediated redox mechanism followed by reducing Cu(III) which is a chemical reaction (EC mechanism ). These species formed in more positive potentials and act as a redox intermediate for TP oxidation. There was a linear relationship between the oxidation peak current and the square root of scan rate, showing that the oxidation reaction of TP at nano-CPE might be due to the diffusion controlled process.

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