FENTON-LIKE OXIDATION OF REACTIVE BLACK 5 IN THE PRESENCE OF LABO3 (B: Fe, Co, Mn, Ni) PEROVSKITE CATALYSTS

Abstract

The catalytic performances of LaBO3 (B: Fe, Co, Mn, Ni) perovskite catalysts in Fenton-like oxidation of the textile dye, Reactive Black 5 were compared, and, the optimum reaction conditions were investigated in the presence of the most efficient catalyst. Reactive Black 5 was selected as the model dye due to its complex chemical structure, high water solubility and common usage in the textile industry. The performances of the catalysts in Reactive Black 5 degradation and decolorization were compared by testing different catalyst loadings. According to the catalyst screening experiments, LaFeO3 showed the highest catalytic performance whereas LaCoO3, LaMnO3, and, LaNiO3 were not effective in the degradation and decolorization of Reactive Black 5. A parametric study was carried out in the presence of LaFeO3 catalyst in order to determine the most suitable reaction conditions. In the parametric study, the effect of catalyst loading, pH and the initial H2O2 concentration were investigated. The initial dye concentration and the reaction temperature were kept constant at 100 ppm and 50℃, respectively. The most suitable reaction conditions were determined as 0.1 g/L of catalyst loading, 3 and 1 mM of H2O2, and, 96.9% degradation, and complete decolorization were achieved under these conditions.