Application of Anodic Oxidation in Diazinon Degradation.

Diazinon, an organophosphorus pesticide, widely used in agricultural activities, can be effectively degraded in aqueous solutions via advanced oxidation processes. Electrochemical oxidation is a promising technique for the degradation of recalcitrant organic micropollutants in water. Thus, this study evaluated the pesticide diazinon degradation by anodic oxidation. To carry out the experiments, a synthetic solution of diazinon was used, with an initial concentration of 40 mg L⁻¹. Two types of electrodes were evaluated, a dimensionally stable anode type, with RuO₂–IrO₂ composition, and a boron-doped diamond (BDD) electrode. In addition, two supporting electrolytes (NaCl and Na₂SO₄), the electrolyte concentration, current density and also energy consumption were evaluated. All configurations were able to promote the degradation of total organic carbon. The anodic oxidation for the degradation of diazinon was more efficient with the BDD electrode, reaching 97.5% of diazinon removal after 180 min with 25 mM of Na₂SO₄, a current density of 42 mA cm⁻² and pH 3. [ABSTRACT FROM AUTHOR]