This study reported the kinetics and mechanism of degradation of odorant haloanisoles by peracetic acid combined with UV irradiation (PAA/UV). The removal efficiency of haloanisoles by PAA/UV was more than 92 % after 1 h reaction at pH 5, 25 °C, [HAs] =50 μg/L and [PAA] = 10 mg/L. The degradation of haloanisoles was fitted by the first-order kinetic model, and the rate constants of various haloanisoles followed the order: 2,4,6-tribromoanisole (2,4,6-TBA, (9.25 ± 0.71)×10⁻² s^-1) > 2-monochloroanisole (2-MCA, (8.00 ± 0.34)×10⁻² s^-1) > 2,4-dichloroanisole (2,4-DCA, (6.24 ± 0.55)×10⁻² s^-1) > 2,4,6-trichloroanisole (2,4,6-TCA, (5.05 ± 0.04)×10⁻² s^-1). The contribution of PAA (mainly composed of free radicals produced from PAA activation by UV) to the degradation rate of chloroanisoles in PAA/UV process ranged from 24 % to 36 %, while 25 % to the degradation rate of bromoanisole. Direct photolysis contributed much more to the removal of bromoanisole (42 %) than chloroanisoles (9–14 %). The inhibition of tert-butanol on degradation demonstrated the existence of ·OH, and superoxide radical and carbon-centered radicals were also probably existed in PAA/UV process. Combining density functional theory (DFT) calculation and products analysis, the degradation pathway of haloanisoles in PAA/UV process were determined. The odor and toxicity evaluation indicated PAA/UV process could reduce olfactory discomfort and health risk of haloanisoles.

这项研究报告了过乙酸与紫外线辐射（PAA / UV）结合降解动力学卤代苯甲醚的动力学和机理。在pH 5、25°C，[HAs] = 50μg/ L和[PAA] = 10 mg / L的条件下反应1 h后，PAA / UV去除卤苯甲醚的效率超过92％。用一级动力学模型拟合卤代苯甲醚的降解，各种卤代苯甲醚的速率常数遵循以下顺序：2,4,6-三溴苯甲醚（2,4,6-TBA，（9.25±0.71）×10 ^-2小号^-1）> 2-monochloroanisole（2-MCA，（8.00±0.34）×10 ^-2小号^-1）> 2,4- dichloroanisole（2,4-DCA，（6.24±0.55）×10个^-2小号^{- 1}）> 2,4,6-三氯茴香醚（2,4,6-TCA，（5.05±0.04）×10 ^-2 s^-1）。PAA（主要由紫外线激活PAA产生的自由基组成）对PAA / UV过程中氯茴香醚降解率的贡献范围为24％至36％，而对溴苯甲醚降解率的贡献率为25％。直接光解对溴代茴香醚（42％）的去除比氯代茴香醚（9–14％）的去除贡献更大。叔丁醇对降解的抑制作用表明存在·OH，在PAA / UV过程中也可能存在超氧自由基和以碳为中心的自由基。结合密度泛函理论（DFT）计算和产物分析，确定了卤苯甲醚在PAA / UV过程中的降解途径。气味和毒性评估表明，PAA / UV工艺可以减少卤代苯甲醚的嗅觉不适和健康风险。