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Degradation of simazine by photolysis of hydrogen peroxide Fenton and photo-Fenton under darkness, sunlight and UV light
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2021-06-17 , DOI: 10.1016/j.jwpe.2021.102115
M. Lojo-López , J.A. Andrades , A. Egea-Corbacho , Mª.D. Coello , J.M. Quiroga

The study presents the results of the degradation of simazine at concentrations of 4 mg/L and 0.5 mg/L by means of different Advanced Oxidation Processes: photolysis of hydrogen peroxide under sunlight and UV light, Fenton and photo-Fenton under sunlight and UV light in ultrapure water at laboratory scale. The aim of the study was to optimize some of the main operating variables involved in the process: reaction time, concentrations of iron and peroxide, light sources and pH, employing D-optimal and Full-factorial design. Using contour plots from the D-optimal design, the concentrations of iron and peroxide, sunlight and UV radiation were found to be the factors that most influence the advanced oxidation processes employed in this study. Full-factorial analysis allowed us to establish the time, concentrations of iron and hydrogen peroxide and operating variables that most affect the degradation of simazine under sunlight and UV radiation. The degradation kinetics were likewise determined, establishing that the kinetic constants obey the following ascending order of effectiveness: kphotolysis under sunlight < kphoto-Fenton under sunlight < kUV < kphotofenton under UV radiation <kphotolysis under UV radiation. Finally, among the different advanced oxidation processes applied to the degradation of simazine in ultrapure water, it was determined that the H2O2/UV process provides the highest level of pesticide removal.



中文翻译:

在黑暗、阳光和紫外线下通过过氧化氢 Fenton 和 photo-Fenton 的光解降解西玛津

该研究展示了通过不同的高级氧化过程降解 4 mg/L 和 0.5 mg/L 浓度的西玛津的结果:过氧化氢在阳光和紫外线下的光解,在阳光和紫外线下的芬顿和光芬顿在实验室规模的超纯水中。该研究的目的是优化过程中涉及的一些主要操作变量:反应时间、铁和过氧化物的浓度、光源和 pH 值,采用 D 最优和全因子设计。使用 D 最优设计的等高线图,发现铁和过氧化物的浓度、阳光和紫外线辐射是影响本研究中使用的高级氧化过程的最大因素。全因子分析使我们能够确定时间,铁和过氧化氢的浓度以及在阳光和紫外线辐射下对西玛津降解影响最大的操作变量。同样确定降解动力学,确定动力学常数服从以下有效性升序:k在太阳光下光解<K光芬顿在太阳光下<K UV <K photofenton在UV辐射下<K光解在UV辐射下。最后,在用于降解超纯水中西玛津的不同高级氧化工艺中,确定 H 2 O 2 /UV 工艺可提供最高水平的农药去除。

更新日期:2021-06-18
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