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Reaction kinetics and degradation efficiency of halogenated methylparabens during ozonation and UV/H2O2 treatment of drinking water and wastewater effluent
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2021-11-27 , DOI: 10.1016/j.jhazmat.2021.127878
Woorim Lee 1 , Sandro Marcotullio 2 , Hoonsik Yeom 3 , Heejong Son 3 , Tae-Hun Kim 4 , Yunho Lee 2
Affiliation  

This study investigated the reaction kinetics and degradation efficiency of methylparaben and its halogenated products (Cl-, Br-, Cl,Cl-, Br,Cl-, and Br,Br-methylparabens) during ozonation and UV254/H2O2 treatment. Second-order rate constants for reactions of the parabens with ozone and OH were kO3 = 107 – 108 M−1 s−1 and kOH = (2.3 – 4.3)×109 M−1 s−1 at pH 7. Species-specific kO3 values of the protonated and deprotonated parabens were closely related to phenol ring substituent effects via quantitative structure-activity relationships with other substituted phenols. The UV photolysis rate of the parabens [kUV = (2.4 − 7.2)×10−4 cm2 mJ−1] depended on the halogenation state of the paraben and solution pH, from which species-specific quantum yields were also determined. In simulated treatments of drinking water and wastewater effluent, the parabens were efficiently eliminated during ozonation, requiring a specific ozone dose of <0.3 gO3/gDOC for >98% degradation. During UV/H2O2 treatment with 10 mg L−1 H2O2, the degradation levels were >90% at a UV fluence of 2000 mJ cm−2, except for Cl,Cl-methylparaben. Kinetic models based on the obtained reaction kinetic parameters could successfully predict the degradation levels of the parabens. Overall, ozonation and UV/H2O2 were effective in controlling parabens and their halogenated products during advanced water treatment.



中文翻译:

饮用水和废水的臭氧化和 UV/H2O2 处理过程中卤代对羟基苯甲酸甲酯的反应动力学和降解效率

本研究考察了对羟基苯甲酸甲酯及其卤化产物(Cl-、Br-、Cl、Cl-、Br、Cl-和 Br,Br-对羟基苯甲酸甲酯)在臭氧化和 UV 254 /H 2 O 2处理过程中的反应动力学和降解效率。 . 对羟基苯甲酸酯与臭氧和• OH反应的二级速率常数为ķ3= 10 7 – 10 8  M -1 s -1ķ= (2.3 – 4.3)×10 9  M -1 s -1,pH 7。物种特异性ķ3质子化和去质子化的对羟基苯甲酸酯的值通过与其他取代酚的定量构效关系与酚环取代基效应密切相关。对羟基苯甲酸酯的紫外光解速率 [ķ紫外线= (2.4 - 7.2)×10 -4 cm 2 mJ -1 ] 取决于对羟基苯甲酸酯的卤化状态和溶液 pH 值,从中也可以确定物种特异性量子产率。在饮用水和废水排放的模拟处理中,对羟基苯甲酸酯在臭氧化过程中被有效消除,需要 <0.3 gO 3 /gDOC 的特定臭氧剂量才能降解 >98%。在用 10 mg L -1 H 2 O 2进行UV/H 2 O 2处理期间,在 2000 mJ cm -2的 UV 通量下降解水平 > 90%  , 除 Cl,Cl-对羟基苯甲酸甲酯。基于获得的反应动力学参数的动力学模型可以成功地预测对羟基苯甲酸酯的降解水平。总体而言,臭氧化和 UV/H 2 O 2在高级水处理过程中可有效控制对羟基苯甲酸酯及其卤化产物。

更新日期:2021-11-27
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