Optimization of oxidative MO’s degradation in heterogeneous Fenton-like reaction using Fe-MKSF

Abstract

This study investigates the optimal operational conditions for oxidative degradation of methyl orange (MO) in heterogeneous Fenton-like reaction using iron-immobilized montmorillonite KSF (Fe-MKSF) composites. Central composite design (CCD) experiments were used to determine the effects of four operational variables; pH solution, catalyst dosage, concentration of H2O2 and initial concentration of methyl orange dye (MO) on the percentage of MO removal. Based on the analysis of variance (ANOVA), the model illustrated high correlation coefficient (R2) of 0.9589 which demonstrated approximately 96% of target function variation. The optimal operational conditions were found to be at 2.8 pH solution, 0.8g/L catalyst dosage, 15 mM H2O2 concentration and 25 mg/L MO initial concentration which subsequently resulted in 98% of MO removal. Moreover, the experimental values obtained were in good agreement with the values predicted from the model, with relatively slight differences of 1.24%. Such findings shown significant interaction between four operational variables towards MO removal during the heterogeneous Fenton-like reaction using Fe-MKSF composites.