Degradation of Phenol in Aqueous Solution by Fenton, Sono-Fenton and Sono-photo-Fenton Methods

摘要

The present work focuses on the performance of Fenton, sono-Fenton, and sono-photo-Fenton processes for the oxidation of phenol present in aqueous solution. The effects of H_2O_2 concentration, Fe~(2+) concentration, pH, and initial phenol concentration on the oxidation of phenol were studied. The optimum Fe~(2+) and H_2O_2 concentrations for the Fenton process were 45 and 800 mg/L, respectively. For the sono-Fenton process, the optimum Fe~(2+) and H_2O_2 concentrations were 30 and 800 mg/L, respectively. The optimal conditions for the sono-photo-Fenton process were found to be 20 mg/L of Fe~(2+) and 700 mg/L of H_2O_2. The optimum pH was found to be 3 for the processes investigated in the present study. The analysis of results showed that the sono-photo-Fenton method reduced the Fe~(2+) concentration by 30-50% and the H_2O_2 concentration by 12.5%. It was found that the sono-photo-Fenton technique showed better performance than the Fenton and sono-Fenton processes for the oxidation of phenol. A lumped kinetic model was used to predict the chemical oxygen demand reduction and the model was found to fit the data.