Catalytic Ozonation for the Degradation of p-Chloronitrobenzene in Aqueous Solution by Pumice

Abstract

Catalytic ozonation of p -Chloronitrobenzene ( p CNB) in aqueous solution has been carried out where pumice have been used as the catalysts. The presences of the catalysts significantly improve the degradation efficiency of p CNB and the utilization efficiency of ozone. The adsorption of p CNB is too small to make a significant contribution to the degradation of p CNB in either of the processes of catalytic ozonation by pumice. Addition of t -BuOH causes the obvious decrease of degradation efficiency, suggesting that degradation of p CNB follows the mechanism of hydroxyl radical (OH) oxidation. Some of the main operating variables like dosage of catalyst and reaction temperature exert a positive influence on the degradation efficiency of p CNB.