Effect of background constituents on the degradation of trace nitrobenzene in aqueous solution by catalytic ozonization

Effect of background constituents on the catalytic ozonization of nitrobenzene was investigated. Degradation rates of ozonization alone, ceramic honeycomb and modified ceramic honeycomb-catalyzed ozonization in tap water increased by 4.90% , 2.41% and 5.12% than those in distilled water respectively. The removal rate of ozonization alone increased by 6.25% with the increase of the concentration of magnesium ion (0-8 mg·L^-1) , but those of other two processes decreased by 11.41% and 17.64% , respectively, under the same experimental condition. Degradation efficiency of ozonization alone, ceramic honeycomb and modified ceramic honeycomb-catalyzed ozonization decreased by 4.42%-9.38% and 12.24%, respectively, with the increase of the concentration of chloride ion (0-40 mg·L^-1). At the lower concentration, humic acid could accelerate the degradation of nitrobenzene, however, the reaction was retarded at higher concentrations of humic acid. The experiment also studied the influences of the applied ozone and initial concentration of nitrobenzene.