Employing a New Catalytic Ozonation(O3/MnO2/CP) for Degradation of Nitro Toluene in Aqueous Environment Using Box-Behnken Experimental Design

Document Type : Research Article

Authors

1 Department of Chemical Engineering, Arak Branch, Islamic Azad University, Arak, I.R. IRAN

2 Department of Chemistry, Payame Noor University (PNU), Tehran, I.R. IRAN

Abstract

In this work, the degradation of Nitro toluene (NT) which is one of the constituents of petrochemical wastewater was explored byMnO2/Clinoptilolite/O3 process. The Box-Behnken experimental design was used and the effect of some operating parameters such as concentration of pollutant, initial pH, and amount of MnO2/Cp was inspected. A radical mechanism with the formation of an anion radical (  before hydroxyl radical is proposed for describing the interaction between ozone and MnO2/Cp . The optimum conditions predicted by the model were as the following: [MnO2/Cp ] = 0.45 mg/L, pH at 8.5, ozonation time at 48 min and [NT] = 30 mg/L.In optimum condition, the removal of NT and Chemical Oxygen Demand (COD) was 99.8, and 74% respectively. The removal of NT in the ozone along with MnO2/CP was higher than the sum of the separate processes of single adsorption of catalyst (6%) at 0.6 mg/L and single ozonation(79%).

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