Document Type: Research Article
Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN
Depertment of Chemistry, Lahijan Branch, Islamic Azad University, Lahijan, I.R. IRAN
Depertment of Chemistry, Shahrood Branch, Islamic Azad University, Shahrood, I.R. IRAN
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.