Iranian Journal of Chemistry & Chemical Engineering (Aug 2020)

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

  • Fateme Ghaemi-Amiri,
  • Hossein Aghaie,
  • Masoud Giahi,
  • Majid Mozaffari

DOI
https://doi.org/10.30492/ijcce.2019.35445
Journal volume & issue
Vol. 39, no. 4
pp. 99 – 112

Abstract

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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 the 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 the scan rate, showing that the oxidation reaction of TP at nano-CPE might be due to the diffusion-controlled process.

Keywords