Clopyralid degradation by AOPs enhanced with zero valent iron
Clopyralid degradation by AOPs enhanced with zero valent iron
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DOI：
10.1016/j.jhazmat.2020.122282
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发表时间：
2020-06-15
影响因子：
13.6
通讯作者：
Rodrigo, M. A.
中科院分区：
文献类型：
--
作者：
Barbosa Ferreira, M.;Souza, F. L.;Rodrigo, M. A.
比较了四种不同技术(光解、ZVI+光解、电解法和ZVI+电解法)在(1)氯吡草胺的降解，(2)其矿化程度，(3)副产物的形成和主要反应途径方面的差异。结果表明，光解处理效果较差，仅能达到5%的去除效果，远低于ZVI和电解法，ZVI在4h内即可达到45%的去除效果和78%的矿化度，而ZVI作为电解法的前处理效果最好。用LC-MS对每个处理的转化产物进行鉴定。总共确定了10种产品。提出了所有工艺优先降解氯吡草胺的初步途径。这项工作提请注意涉及氯化化合物处理的各种技术的耦合所引起的协同作用，并阐明了所评价的每一种处理的优先机制是如何发生的。
Four different technologies have been compared (photolysis, ZVI + photolysis, electrolysis and ZVI + electrolysis) regarding the: (1) degradation of clopyralid, (2) extent of its mineralization, (3) formation of by-products and main reaction pathways. Results show that photolysis is the less efficient treatment and it only attains 5 % removal of the pollutant, much less than ZVI, which reaches 45 % removal and that electrolysis, which attains complete removal and 78 % mineralization within 4 h. When ZVI is used as pre-treatment of electrolysis, it was obtained the most efficient technology. The identification of transformation products was carried out for each treatment by LC-MS. In total, ten products were identified. Tentative pathways for preferential clopyralid degradation for all processes were proposed. This work draws attention of the synergisms caused by the coupling of techniques involving the treatment of chlorinated compound and sheds light on how the preferential mechanisms of each treatment evaluated occurred.