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The catalytic performances of LaBO 3 (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, LaFeO 3 showed the highest catalytic performance whereas LaCoO 3 , LaMnO 3 , and, LaNiO 3 were not effective in the degradation and decolorization of Reactive Black 5. A parametric study was carried out in the presence of LaFeO 3 catalyst in order to determine the most suitable reaction conditions. In the parametric study, the effect of catalyst loading, pH and the initial H 2 O 2 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 H 2 O 2 , and, 96.9% degradation, and complete decolorization were achieved under these conditions.

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