Heterogeneous catalytic ozonation of 2-chlorophenol aqueous solution with alumina as a catalyst

Abstract

Heterogenous catalytic ozonation of 2-chlorophenol (2-CP) in the presence of gamma -alumina as a solid catalyst has been investigated in this research. It showed that the rate for degradation of TOC could increase from 21% to 43%. The pseudo-first reaction constants of 2-CP could increase from 0.8688 min(-1) to 0.1270, increasing by approximately 40%. At the same time, the consumption of ozone was only half that of ozone alone. This research also explored the effects of the catalyst dosage, pH values and removal kinetics of 2-CP. In addition, three consecutive running with the same catalyst revealed insignificant reduction of the activity. Furthermore, the elimination of toxicity was evaluated by Microtox(R) analysis. The detoxification was more stable and with good results.