Abstract：Oxidization of the simulated ketoprofen (KET) wastewater was investigated by ozone (O3). The effect of the initial solution pH, ozone flow (QO3), temperature (T), and initial KET concentration (C0) on KET degradation were investigated. To assess the contribution of O3 and hydroxyl radicals (·OH) to the degradation of KET, experiments have been conducted under the conditions comprising initial KET concentration of 20μmol/L, ozone flow at 0.4L/min, pH at 4, 7, or 10under room temperature. In the competition experiments, ibuprofen and benzoic acid were used as the probe to measure the second-order rate constants of KET degradation with respect to O3 and ·OH, respectively. Results indicated that KET degradation followed the pseudo first-order kinetics. Increasing pH, QO3 and T accelerated KET degradation, while KET degradation rate decreased with the increase of C0. The apparent kinetics equation (k=154439exp (-32831/RT)QO30.679C0-0.2[OH-]0.07) was obtained by fitting experimental data. Both O3 and ·OH are contributed to the degradation of KET. Results also showed that the contribution of O3 to KET degradation were 18.4%,11.0%, and 6.2%, while to ·OH were 81.6%, 89.0% and 93.8% at pH 4, 7, and 10, respectively. The second-order rate constants of KET were 1.09, and 8.82×109L/(mol·s) with respect to O3 and ·OH, respectively.
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