Decoloration of the azo dye Orange G (OG) was investigated by using hematite/H2O2 as a heterogeneous Fenton-like reagent. This study was performed to utilize the natural iron ore from nearby mining company in India. The cheaper and easier availability of this natural occurring iron ore makes this material attractive in effectively applying wastewater treatment. Parameters such as the initial concentration of dye (OG), dosage of mineral hematite (Fe2O3), hydrogen peroxide (H2O2), and reaction temperature were varied to study the efficiency of % OG decoloration. With an initial Orange G dye concentration of 100 mg/L and hematite, 20 g/L pH 3, temperature 25°C, and varying the concentration of H2O2 from 200 to 800 mg/L, the percent decoloration of Orange G increased from 64% to 95.14%, respectively, at reaction time of 60 min. In all the cases, decoloration kinetics of OG followed the pseudofirst-order reaction kinetics, and the activation energy E was calculated to be 24.78 kJ/mol between the temperature ranges from 25°C to 60°C. This work proposes a theoretical model for the decoloration of OG by the Fenton-like process, which involves hydrogen peroxide and mineral hematite. This study also reports the order of reaction with respect to catalyst and H2O2 concentration.
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