Electrooxidation of Oxacillin on a Boron-doped Diamond Electrode: A Voltammetric Investigation

The effectiveness of electrochemical techniques in preventing and resolving wastewater contamination issues has been demonstrated. However, this method requires knowledge of the organic pollutant's (Oxacillin: OXA) electrochemical behavior before electrolysis. The aim of this study is to enhance comprehension of the electrochemical process of oxacillin oxidation on the non-active boron-doped diamond (BDD) electrode. These electrochemical properties, focusing on phenomena at the electrode/electrolyte interface, were analyzed by cyclic voltammetry. Effects of concentration of oxacillin, potential scan rate, number of potential scanning cycles, temperature and chloride ions that were investigated allowed for the acquisition of some parameters. This study showed that BDD electrode can be used to quantitatively determine the presence of this substrate in medicines and environmental samples. The process is irreversible and diffusion controlled and proceed in two ways: an indirect oxidation mediated by in situ oxidative species and a direct electron transfer at the surface of the boron-doped diamond electrode. Parameters of OXA electrooxidation, such as anodic transfer coefficient, heterogenous rate constant and activation energy were estimated as 1.09, 1.97×10<sup>3</sup> s<sup>-1</sup> and 17.632kJ mol<sup>-1</sup>. The increase in temperature and the presence of chloride ions promote oxidation of OXA. This indicates electrochemical conditions adequate to oxidize oxacillin on boron-doped diamond anode.