Efficient degradation of perfluorooctanoic acid by UV–Fenton process
Efficient degradation of perfluorooctanoic acid by UV–Fenton process
复制标题
DOI：
10.1016/j.cej.2012.01.020
复制
发表时间：
2012-03
影响因子：
15.1
通讯作者：
Heqing Tang;Qingqing Xiang;M. Lei;Jingchun Yan;Lihua Zhu;Jing Zou
中科院分区：
文献类型：
--
作者：
Heqing Tang;Qingqing Xiang;M. Lei;Jingchun Yan;Lihua Zhu;Jing Zou
研究了全氟辛酸（PFOA）在UV-Fenton体系中的分解。研究发现，在UV-Fenton体系中，PFOA能被有效降解，生成氟离子和短链全氟羧酸。PFOA的降解可分为两个阶段：在1h的反应时间内，添加的PFOA被快速降解，PFOA去除率为87.9%，脱氟效率为35.8%；1h后，反应时间为5h时，PFOA去除率缓慢提高至95%以上，脱氟效率为53.2%。这与UV-Fenton系统中PFOA降解过程的两阶段机制相对应。PFOA在第一阶段的快速脱氟和降解归因于强氧化OH自由基的产生，它加速了PFOA的脱羧。在第二阶段，h2o2被完全消耗，除氟主要是由于PFOA与Fe3+离子的相互作用。
Decomposition of perfluorooctanoic acid (PFOA) was investigated in UV–Fenton systems. It was found that PFOA could be efficiently degraded in the UV–Fenton system, producing fluoride ions and short-chain perfluorinated carboxylic acids. The degradation of PFOA could be divided into two stages: Within reaction time of 1h, the added PFOA was rapidly degraded, resulting in a PFOA removal of 87.9% and a defluorination efficiency of 35.8%; Beyond 1h, the PFOA removal was slowly increased to more than 95% at reaction time of 5h, along with the defluorination efficiency of 53.2%. This corresponded to a two-stage mechanism for the PFOA degradation process in the UV–Fenton system. The fast defluorination and degradation of PFOA at the first stage was attributed to the generation of strong oxidizing OH radicals, which accelerated PFOA decarboxylation. At the second stage, H2O2was completely consumed, and the defluorination was mainly due to the interactions between PFOA and Fe3+ions.