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首页> 外文期刊>RSC Advances >Influence of solution pH on degradation of atrazine during UV and UV/H2O2 oxidation: kinetics, mechanism, and degradation pathways
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Influence of solution pH on degradation of atrazine during UV and UV/H2O2 oxidation: kinetics, mechanism, and degradation pathways

机译：溶液pH对紫外线和紫外/ H2O2氧化过程中尿嘧啶降解的影响：动力学，机制和降解途径

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The kinetics, degradation mechanism and degradation pathways of atrazine (ATZ) during sole-UV and UV/H _(2) O _(2) processes under various pH conditions were investigated; the effects of UV irradiation time and H _(2) O _(2) dose were also evaluated. A higher reaction rate was observed under neutral pH conditions in the UV only process. For the UV/H _(2) O _(2) process, a higher reaction rate was observed in acidic solution and the degradation rate of ATZ firstly increased with the increase of concentration of H _(2) O _(2) and then decreased when H _(2) O _(2) concentration exceeded 5 mg L ~(?1) . In addition, qualitative and quantitative analyses of oxidation intermediates of ATZ in aqueous solution during the sole-UV and UV/H _(2) O _(2) processes were conducted using UPLC-ESI-MS/MS. Ten kinds of dechlorinated intermediates were detected during sole-UV treatment under all five pH conditions. In contrast, the speciation of intermediates in the UV/H _(2) O _(2) process varied dramatically with solution pH. Based on the analysis of ATZ oxidation intermediates, ATZ degradation pathways under different pH conditions were proposed for the sole-UV and UV/H _(2) O _(2) processes. The results showed that the main degradation reactions of ATZ included dechlorination-hydroxylation, dechlorination-dealkylation, de-alkylation, deamination-hydroxylation, alkylic-oxidation of lateral chains, dehydrogenation-olefination, dechlorination-hydrogenation, dechlorination-methoxylation and dehydroxylation.
机译：研究了在各种pH条件下的唯一-UV和UV / H _（2）O _（2）o _（2）o _（2）o _（2）o _（2）过程中的阿特拉嗪（ATZ）的动力学，降解机理和降解途径;还评估了UV照射时间和H _（2）O _（2）剂量的影响。在UV中的中性pH条件下观察到更高的反应速率。对于UV / H _（2）O _（2）的方法，在酸性溶液中观察到更高的反应速率，并且ATZ的降解速率随着H _（2）O _（2）的浓度的增加而增加，然后在H _（2）o _（2）浓度超过5mg l〜（α1）时减少。另外，使用UPLC-ESI-MS / MS进行唯一-UV和UV / H _（2）O _（2）o _（2）o×（2）o _（2）o _（2）o×（2）o _（2）o×（2）o _（2）方法的定性和定量分析ATZ在水溶液中的氧化中间体。在所有五个pH条件下唯一的UV处理中检测到十种脱氯中间体。相反，UV / H _（2）o _（2）℃的中间体的形态与溶液pH有显着变化。基于ATZ氧化中间体的分析，提出了不同pH条件下的ATZ降解途径，用于唯一-UV和UV / H _（2）O _（2）o o _（2）方法。结果表明，ATZ的主要降解反应包括脱氯 - 羟基化，脱氯化，脱烷基化，脱氨基 - 羟基化，侧链烷基氧化，脱氢 - 烯烃，脱氯 - 氢化，脱氯 - 甲氧基化和脱羟基化。

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