Employing a New Catalytic Ozonation(O۳/MnO۲/CP) for Degradation of Nitro Toluene in Aqueous Environment Using Box-Behnken Experimental Design

In this work, the degradation of Nitro toluene (NT) which is one of the constituents of petrochemical wastewater was explored byMnO۲/Clinoptilolite/O۳ 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 MnO۲/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 MnO۲/Cp . The optimum conditions predicted by the model were as the following: [MnO۲/Cp ] = ۰.۴۵ mg/L, pH at ۸.۵, ozonation time at ۴۸ min and [NT] = ۳۰ mg/L.In optimum condition, the removal of NT and Chemical Oxygen Demand (COD) was ۹۹.۸, and ۷۴% respectively. The removal of NT in the ozone along with MnO۲/CP was higher than the sum of the separate processes of single adsorption of catalyst (۶%) at ۰.۶ mg/L and single ozonation(۷۹%).

کلیدواژه ها:

MnO۲/CP nanocatalyst ، Clinoptilolite Zeolite ، Degradation ، Nitro toluene (NT) ، catalytic ozonation ، Petrochemical wastewater