KINETIC STUDIES OF DEGRADATION OF BENZOIC ACID AND SALICYLIC ACID THROUGH OZONATION, PEROXONE, PHOTOOZONATION AND PHOTOPEROXONE

Abstract

In this study, benzoic acid and salicylic acid in their aqueous solutions were treated by ozonation, photo-ozonation, photoperoxone and photoperoxone processes. A batch photoreactor with 8W low pressure mercury vapour lamp was used to carry out the experiments for examining the effects of various combinations of ozone, H2O2 and UV and their rates of degradation were compared. The concentration of the substrate was determined with an UV-visible spectrophotometer. The photodegradation processes conformed to first-order kinetics. The degradation rate of the two substrates is as follows: photoperoxone (UV/O3/H2O2)> photoozonation(UV/O3)> peroxone(O3/H2O2)> ozonation(O3).