| Summary: | In phosphate buffer, the degradation of ATZ by ozone/(O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub>) 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 H<sub>2</sub>O<sub>2</sub> concentration and the O<sub>3</sub> concentration were 20 mol/L and 20 mol/L, respectively. Moreover, the degradation rate of 5 mol/L ATZ under the influence of O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> was 92.59% in phosphate buffer at pH7. The mechanism analysis showed that HO• and O<sub>3</sub> underwent co-oxidized degradation and that the HO• and O<sub>3</sub> oxidation 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 O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> degradation were more compatible with quasi-second-order reaction kinetics under different temperatures, pH values, and H<sub>2</sub>O<sub>2</sub> concentrations.
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