Oxidation of phenol using LaMnO₃ perovskite, TiO₂, H₂O₂and UV radiation

Abstract

LaMnO₃ perovskite has been used for the treatment of aqueous solution of phenol using stoichiometric amount of H₂O₂ and combination of TiO₂ and UV radiation. The oxidation of phenol was studied with [UV radiation]; [H₂O₂ and UV]; [TiO₂ and UV]; [LaMnO₃ and UV]; [TiO₂, H₂O₂ and UV]; [LaMnO₃, H₂O₂ and UV]; to establish the effectiveness of different systems when compared with perovskite catalyst. Results show that the phenol degradation efficiencies decreased in the following order [LaMnO₃, H₂O₂ and UV] > [TiO₂, H₂O₂and UV] > [LaMnO₃ and UV] > [TiO₂ and UV]> [H₂O₂ and UV ] > [UV]. UV-VIS spectra result of phenol degradation shows that as the concentration of catalyst increases, its activity increases. The optimum concentration of catalyst was 0.60 g/L for 100 ppm phenol solution. Perovskite catalyst after reaction is completely regenerated by calcinations at 800°C for 2 h and retains a similar catalytic performance