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Electrochemical behavior of paracetamol on Thermally Prepared Ti/Ta2O5/50Pt-50RuO2 Electrode

Mohamed Berté, Gnamba Corneil Quand-même, Kambiré Ollo, Sadia Sahi Placide, Koffi Konan Sylvestre, Ouattara lassiné


Paracetamol (PCM), one of the most consumed drugs globally, is found in the environment, domestic wastewater, and hospital wastewater. Our objective is to electrochemically oxidize paracetamol using a ruthenium dioxide modified platinum electrode (Ti/Ta2O5/50Pt-50RuO2). This study was carried out using physical characterization (Scanning electron micrographs) and interpretation of cyclic voltammograms. Platinum (Ti/Ta2O5/Pt), ruthenium dioxide (Ti/Ta2O5/RuO2), and platinum – ruthenium dioxide (Ti/Ta2O5/50Pt-50RuO2) electrodes have been prepared thermally at 400°C on sandblasted titanium modified Ta2O5 substrate. The scanning electron micrographs characterization showed that Ti/Ta2O5/50Pt-50RuO2 electrode surfaces contain Pt and RuO2. The surfaces of Ti/Ta2O5/Pt and Ti/Ta2O5/RuO2 electrodes contain Pt and RuO2, respectively.  This work shows that PCM degradation was possible on Ti/Ta2O5/50Pt-50RuO2 electrode with the faradic current on the voltammograms presence. In comparison to Ti/Ta2O5/Pt and Ti/Ta2O5/RuO2 electrodes, this study showed that Ti/Ta2O5/50Pt-50RuO2 electrode was more electrocatalytic for PCM electrooxidation. These results indicate that PCM degradation on this electrode can occur either by indirect catalytic oxidation involving adsorbed hydroxyl radicals or other oxidizing species produced in situ or by direct electron transfer to the electrode surface.. The analysis of the peak currents and the peak potentials has revealed that the PCM electrooxidation process on this electrode attested to an irreversible character. Finally, the results proved that paracetamol electrooxidation on Ti/Ta2O5/50Pt-50RuO2 electrode is associated with mixed control adsorption-diffusion. Oxidation proceeds by adsorption, then the transfer of two electrons to the electrode surface and a chemical transformation. The investigated process proceeded according to the EC mechanism.

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