Influence of iodides on the electrochemical oxidation of paracetamol on boron doped diamond electrode

Résumé

In this work, the influence of iodide on the electrolysis of paracetamol in sulfuric acid medium was carried out using voltammetry. It emerges from this study that for a pH = 0.6, the electrochemical oxidation of paracetamol in the presence of iodide is better than those obtained at pH equal to 3 and 7. This result show that the oxidative action of the iodide and its derivatives is inhibited when pH increases. Preparative electrolysis of paracetamol in the presence of iodide at a current density of 70 mA / cm² using differential pulse voltammetry (DPV) as an analytical method. From our finding iodide and its derivatives substantially contribute to paracetamol oxidation. However, the more the quantity of iodide increases, the less the mineralization of paracetamol is appreciated, as evidenced by the values of the kinetic constants of 1.249 h^-1; 1.316 h^-1 and 1.7223 h^-1 respectively for 100; 50 and 10 mM. During electrolysis, pseudo first order kinetics were obtained for the reaction of iodine and iodide. The oxidation kinetics of paracetamol have also been shown to be a pseudo first order reaction. The current efficiency study has shown that there is less current loss in the presence of iodide.