Electrocatalytic Oxidation of Aromatic Ecopollutants on Composite Anodic Materials

Abstract

Electrocatalytic oxidation of aromatic pollutants (aniline, Methyl Orange, Eriochrome blue SE) is studied on lead dioxide, boron doped diamond, and ruthenium-and titanium-oxide-based anodes (DSA, dimensionally stable anode). The catalytic properties of the tested materials are studied using cyclic voltammetry and galvanostatic electrolysis. The activity of electrodes toward the electrochemical conversion of organics is shown to increase in the sequence of DSA < lead dioxide < boron doped diamond. The oxidation rate decreases in the order of Eriochrome blue SE > Methyl Orange > aniline for all electrodes. The oxidation process of the compounds corresponds to the pseudo-first-order reaction kinetics. The apparent rate constant grows at an increase in the applied current density and decrease in the initial pollutant concentration.The formation of both • OH and radicals is confirmed by the free radical quenching studies; their contribution to the Eriochrome blue SE dye destruction process is evaluated.

Electrochemical comparative study of Ti/Ta2O5/Pt‐RuO2‐IrO2 and Ti/Ta2O5/Pt anodes: Stability, service lifetime, and electrooxidation performance

“…In view of these results, the performance of an electrode used at the anode may depend on the compound to be degraded. Kenova et al 50 showed that the degradation rate of Eriochrome Blue on BDD was more than 43 times that of aniline. According to them, this observation could be probably explained by the aniline ability to polymerize in the course of direct oxidation on the anode surface.…”