Abstract: The degradation of 2,4-dichlorophoxyacetic acid (2,4-D) by ozonation combined with sonication(O₃/US) was investigated.Based on the authors’ first paper about the synergistic effect of ozone and US, this paper presents intermediate products of 2,4-D degradation.The main intermediates were 2,4- dichlorophenol, benzopuinone, hydroquinone and organic acids,such as maleic acid and oxalic acid and so on.In various experimental conditions, concentrations of main intermediates and chloride ion in the solution were determined to analyze reaction pathways, and the degradation mechanism was discussed.

摘要： 利用臭氧超声波联合工艺对苯氧羧酸类除草剂2，4-D进行降解研究，在前文探讨臭氧超声波之间协同效应的基础上，确定其中间产物种类主要有2，4-二氯苯酚、苯醌、氢醌以及小分子酸如顺丁烯二酸、草酸、甲酸、乙酸等.在不同实验条件下，分别对反应溶液里的主要中间产物和离子浓度变化进行分析，研究2，4-D在臭氧超声波联合作用下的反应路径，并初步讨论其降解机理.