Mechanism and Kinetic Analysis of the Degradation of Atrazine by O3/H2O2

In phosphate buffer, the degradation of ATZ by ozone/(O3/H2O2) under various circumstance was explored and the degradation mechanism and dynamics were probed. The findings revealed that when maintaining the reaction temperature at 25 °C, the H2O2concentration and the O3concentration were 20 mol/L and 20 mol/L, respectively. Moreover, the degradation rate of 5 mol/L ATZ under the influence of O3/H2O2was 92.59% in phosphate buffer at pH7. The mechanism analysis showed that HO• and O3underwent co-oxidized degradation and that the HO• and O3oxidation degradation ratios were close to 1:1 under acidic conditions. Furthermore, HO• oxidative degradation dominated the ATZ degradation process. The kinetics analysis showed that the ATZ kinetics of O3/H2O2degradation were more compatible with quasi-second-order reaction kinetics under different temperatures, pH values, and H2O2concentrations.Keywords:ozone;hydrogen peroxide;atrazine;degradation mechanism;kinetics