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Degradation of organic pollutants by Vacuum-Ultraviolet (VUV): Kinetic model and efficiency
Water Research ( IF 12.8 ) Pub Date : 2018-01-09 , DOI: 10.1016/j.watres.2018.01.019
Pengchao Xie , Siyang Yue , Jiaqi Ding , Ying Wan , Xuchun Li , Jun Ma , Zongping Wang

Vacuum-Ultraviolet (VUV), an efficient and green method to produce hydroxyl radical (•OH), is effective in degrading numerous organic contaminants in aqueous solution. Here, were proposed an effective and simple kinetic model to describe the degradation of organic pollutants in VUV system, by taking the •OH scavenging effects of formed organic intermediates as co-existing organic matter in whole. Using benzoic acid (BA) as a •OH probe, •OH was regarded vital for pollutant degradation in VUV system, and the thus developed model successfully predicted its degradation kinetics under different conditions. Effects of typical influencing factors such as BA concentrations and UV intensity were investigated quantitatively by the model. Temperature was found to be an important influencing factor in the VUV system, and the quantum yield of •OH showed a positive linear dependence on temperature. Impacts of humic acid (HA), alkalinity, chloride, and water matrices (realistic waters) on the oxidation efficiency were also examined. BA degradation was significantly inhibited by HA due to its scavenging of •OH, but influenced much less by the alkalinity and chloride; high oxidation efficiency was still obtained in the realistic water. The degradation kinetics of three other typical micropollutants including bisphenol A (BPA), nitrobenzene (NB) and dimethyl phthalate (DMP), and the mixture of co-existing BA, BPA and DMP were further studied, and the developed model predicted the experimental data well, especially in realistic water. It is expected that this study will provide an effective approach to predict the degradation of organic micropollutants by the promising VUV system, and broaden the application of VUV system in water treatment.



中文翻译:

真空-紫外线(VUV)降解有机污染物的动力学模型和效率

真空紫外线(VUV)是一种有效且绿色的产生羟基自由基(•OH)的方法,可有效降解水溶液中的多种有机污染物。在此,通过将形成的有机中间体的•OH清除作用整体上作为共存有机物,提出了一个有效而简单的动力学模型来描述VUV系统中有机污染物的降解。使用苯甲酸(BA)作为•OH探针,•OH被认为对VUV系统中的污染物降解至关重要,因此开发的模型成功预测了其在不同条件下的降解动力学。通过模型定量研究了BA浓度和紫外线强度等典型影响因素的影响。发现温度是VUV系统的重要影响因素,•OH的量子产率对温度呈正线性关系。还考察了腐殖酸(HA),碱度,氯化物和水基质(实际水)对氧化效率的影响。由于HA清除了•OH,因此BA的降解受到HA的明显抑制,但对碱度和氯化物的影响较小。在现实的水中仍然获得了很高的氧化效率。进一步研究了双酚A(BPA),硝基苯(NB)和邻苯二甲酸二甲酯(DMP)以及共存的BA,BPA和DMP三种其他三种典型微污染物的降解动力学,并建立了模型来预测实验数据好,尤其是在现实的水中。

更新日期:2018-01-10
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