Degradação eletroquímica de diclofenaco em água livre de eletrólito usando eletrodos em tela cobertos com mistos contendo Ni e Co

Mixed oxide-covered mesh electrodes (MOMEs) containing cobalt and nickel, denoted as MOME-Ni(x)Co(1x)Oywhere x= 0.9, 0.8 and 0.3, were prepared by thermal decomposition using the slow cooling rate method on a stainless steel fine-mesh support, in order to obtain fluid-permeable anodes (FPA)1. The electrochemical degradation of diclofenac in electrolyte-free water was carried out in batch mode using a solid polymer electrolyte (SPE) filter-press cell. For the different MOME compositions, their properties were investigated as a function of the initial drug concentration (IDC) and the current density (j). The effects of IDC and jon the oxidation of diclofenac were quite similar according to analyses performed using UV-vis spectroscopy and HPLC, where in it was verified that the rate of oxidation (removal) of diclofenac for the different MOMEs increased with increasing jand IDC. Electrode composition (Ni percentage) exerted only a minor influence on the electrochemical combustion of diclofenac. On the other hand, a strong influence of jand IDC on the combustion reaction was verified. It was also verified that an increase in IDC resulted in higher values of total current efficiency (TCE). Taking into account that the lowest values obtained for the electrical energy per order (EEO) were obtained for MOME-Ni(0.3)Co(0.7)Oy, it was concluded that the best overall performance for the electrochemical combustion of diclofenac in electrolyte-free water was achieved using this electrode composition.