Trichloroethylene degradation by zero valent iron activated persulfate oxidation
Trichloroethylene degradation by zero valent iron activated persulfate oxidation
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DOI：
10.1089/ees.2007.0174
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发表时间：
2008-09-01
影响因子：
1.8
通讯作者：
Lai, Ming-Chun
中科院分区：
文献类型：
--
作者：
Liang, Chenju;Lai, Ming-Chun
本研究描述了使用零价铁（Fe-0）作为亚铁离子活化过硫酸盐（PS）氧化三氯乙烯（TCE）的来源。实验结果表明，在没有TCE的情况下，用Fe-0激活过硫酸盐的反应有一定的滞后时间。Fe-0/PS体系的初始pH值下降到酸性条件下，伴随着过硫酸盐的分解和氧化还原电位（ORP）值的降低。此外，在TCE/Fe-0/PS体系中，TCE的快速降解伴随着过硫酸盐的快速分解和氯离子的形成，这是TCE矿化的证据。过硫酸盐氧化前后Fe-0的SEM图像显示Fe-0有明显的腐蚀。在没有TCE的情况下，观察到针状聚集体形成，在有TCE的情况下，观察到粗聚集体形成。XRD谱分析表明，Fe-0与过硫酸盐接触后，表面形成了磁铁矿。因此，Fe-0活化过硫酸盐氧化是一种快速有效的修复TCE污染的方法。
The present study describes the use of zero valent iron (Fe-0) as a source for ferrous ion activated persulfate (PS) oxidation of trichloroethylene (TCE). The experimental results indicated that in the absence of TCE there was a lag time for persulfate decomposition when the reaction was activated by Fe-0. An initial pH drop in the Fe-0/PS system to acidic conditions was accompanied by the persulfate decomposition and a decrease in oxidation-reduction potential (ORP) values. Furthermore, in the TCE/Fe-0/PS system, the rapid TCE degradation was accompanied by the rapid persulfate decomposition and chloride ion formation as evidence of TCE mineralization. SEM images of Fe-0 before and after persulfate oxidation exhibited significant corrosions of Fe-0. Acicular aggregate formation in the absence of TCE and coarse aggregate formation in the presence of TCE were observed. Moreover, the XRD spectrum revealed the formation of magnetite over the surface of Fe-0 after contact with persulfate. Thus, Fe-0 activated persulfate oxidation offers a fast and effective way for remediation of TCE contamination.