Microwave-hydrothermal decomposition of perfluorooctanoic acid in water by iron-activated persulfate oxidation
Microwave-hydrothermal decomposition of perfluorooctanoic acid in water by iron-activated persulfate oxidation
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DOI：
10.1016/j.watres.2009.09.055
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发表时间：
2010-02-01
期刊：
影响因子：
12.8
通讯作者：
Chen, Man-Li
中科院分区：
文献类型：
--
作者：
Lee, Yu-Chi;Lo, Shang-Lien;Chen, Man-Li
研究了在60 ℃和90 ℃下，用零价铁（ZVI）活化过硫酸盐对水溶液中持久性和生物累积性全氟辛酸（PFOA）的微波水热分解。实验室研究结果表明，当PFOA与5 mM过硫酸盐（PS）和ZVI在90 ℃下处理2 h时，67.6%的PFOA被有效分解为短链全氟羧酸（PFCAs）和氟离子，脱氟效率为22.5%。在PFOA溶液中引入ZVI与PS的协同作用，加快了PFOA的分解速度，缩短了反应时间。ZVI不仅分解PFOA，而且在较低的反应温度下释放亚铁离子以降低PS的活化能，同时形成硫酸根自由基。ZVI和过硫酸盐的组合使用将导致显著的能耗节省和工艺时间的减少。(c)2009年由Elsevier Ltd.出版
The microwave-hydrothermal decomposition of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in aqueous solution using persulfate activated by zero-valent iron (ZVI) at 60 and 90 degrees C was examined. The results of laboratory study reveal that when PFOA is treated with 5 mM persulfate (PS) and ZVI at 90 degrees C for 2 h, 67.6% of PFOA is effectively decomposed to form shorter-chain perfluorinated carboxylic acids (PFCAs) and fluoride ions, with 22.5% defluorination efficiency. Introducing ZVI into the PFOA solution with PS addition will lead to synergetic effect that accelerates the PFOA decomposition rate, and reduces the reaction time. ZVI not only decomposes PFOA, but also releases ferrous ions to lower the activation energy of PS while forming sulfate free radicals at a lower reaction temperature. The combined use of ZVI and persulfate will lead to significant savings in energy consumption and reduction of process time. (c) 2009 Published by Elsevier Ltd.