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首页> 外文期刊>Journal of Hazardous Materials >Model applications and mechanism study on the degradation of atrazine by Fenton's system
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Model applications and mechanism study on the degradation of atrazine by Fenton's system

机译：Fenton系统降解阿特拉津的模型应用及机理研究

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摘要

Atrazine (ATZ), 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine, was effectively degraded by hydroxyl radicals that were generated by Fe~Ⅱ/H_2O_2 in the Fenton's process. Up to 98% ATZ removal can be achieved in the process if the doses of Fe~Ⅱ and H_2O_2 are selected appropriately. Oxidation capacity of the process was successfully predicted through a kinetic approach with three simple and measurable parameters (i.e., two rate constants and a break point time), which makes the model useful in predicting, controlling and optimizing the degradation of ATZ. In addition, the transformation pathways of ATZ decay was successfully investigated by using a novel technology, liquid chromatography electrospray tandem mass spectrometry (LC/ESI-MS/MS). Ten intermediates were identified in the process. The alkylic-oxidation followed by dealkylation and/or dechlorination-hydroxylation were found to be the major pathways of the decay of ATZ in Fenton's process. All the detected intermediates were found to be dealkylated in different levels or positions. The dealkylated species may be further dechlorinated but generally at a lower fraction (<10%) due to the depletion of oxidants.
机译：Fe〜Ⅱ/ H_2O_2在Fenton过程中产生的羟自由基可有效降解2-r-4-（乙氨基）-6-（异丙氨基）-s-三嗪阿特拉津（ATZ）。如果适当选择Fe〜Ⅱ和H_2O_2的剂量，则该工艺中的ATZ去除率可达到98％。通过动力学方法成功地预测了该过程的氧化能力，该动力学方法具有三个简单且可测量的参数（即两个速率常数和一个断裂点时间），这使得该模型可用于预测，控制和优化ATZ的降解。此外，使用新型技术液相色谱电喷雾串联质谱（LC / ESI-MS / MS）成功研究了ATZ衰减的转化途径。在此过程中确定了十种中间体。发现在芬顿过程中，烷基氧化，随后的脱烷基和/或脱氯-羟基化是ATZ衰减的主要途径。发现所有检测到的中间体在不同的水平或位置脱烷基。脱烷基的物质可以进一步脱氯，但是由于氧化剂的消耗，通常以较低的分数（＜10％）进行脱氯。

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