| 초록 |
Many research of the oxidant for aqueous pollutants have been focused on the reactive oxygen species produced by water oxidation, or active chlorine which used abundant chloride ion for industrial waste water or groundwater. In this study, the performances of chloride, bromide and iodide as oxidating reagent were evaluated using nanoparticulate TiO2 electrocatalyst. It was selected as a substrate to evaluate halide-mediated oxidation because of simple and well-defined pathway for As(III) oxidation to As(V) and the necessity to remove for their toxicity. The performance of reactive halogen species as a mediating reagent were evaluated by observing electrocatalytic As(III) oxidation at various halide concentrations and potentials. The inclusion of halide in the electrolyte significantly improved the faradaic efficiency of electrocatalytic As(III) oxidation, particularly at high potential, where As(V) production efficiency was very low due to competition with water oxidation. |
