文献类型：期刊文献

英文题名：Mechanism of PCE oxidation by percarbonate in a chelated Fe(II)-based catalyzed system

作者：Miao, Zhouwei[1];Gu, Xiaogang[1];Lu, Shuguang[1];Dionysiou, Dionysios D.[2];Al-Abed, Souhail R.[3];Zang, Xueke[1];Wu, Xiaoliang[1];Qiu, Zhaofu[1];Sui, Qian[1];Danish, Muhammad[1]

机构：[1]E China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Univ Cincinnati, Coll Engn & Appl Sci, Dept Biomed Chem & Environm Engn, Environm Engn & Sci Program, Cincinnati, OH 45221 USA;[3]US EPA, Off Res & Dev, Natl Risk Management Res Lab, Cincinnati, OH 45268 USA

年份：2015

卷号：275

起止页码：53

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20151600769483);WOS:【SCI-EXPANDED(收录号:WOS:000356108700007)】；

基金：This study was financially supported by the National Natural Science Foundation of China (No. 41373094 and No. 51208199). Although US EPA contributed to this article, the research presented was not performed by or funded by US EPA. Consequently, the views, interpretations, and conclusions expressed in this article are solely those of the authors and do not necessarily reflect or represent US EPA's views or policies.

语种：英文

外文关键词：Perchloroethylene (PCE); Sodium percarbonate (SPC); Chelated-Fe(II); Hydroxyl radical (HO center dot); Groundwater remediation

摘要：The performance of chelated Fe(II)-based catalyzed sodium percarbonate (SPC) stimulating the degradation of perchloroethylene (PCE) in aqueous solution was investigated using six different chelating agents (CA), namely, citric acid monohydrate (CIT), oxalic acid (OA), L-ascorbic acid (ASC), ethylenediaminetetraacetic acid (EDTA), trisodium citrate 2-hydrate (CIT-Na-3), and EDTA-Na-2, at CA/Fe(II)/SPC/PCE molar ratios of 2/4/4/1,4/4/4/1 and 8/4/4/1. The results indicated that the addition of CIT and OA significantly enhanced the PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by Ha radical oxidation in Fe(II)/SPC, CIT/Fe(II)/SPC, and OA/Fe(II)/SPC systems and O-2(center dot-) also participated in the degradation of PCE in CIT/Fe(II)/SPC and OA/Fe(II)/SPC systems. The intensity of HO center dot detected by electron paramagnetic resonance (EPR) in CIT/Fe(II)/SPC and OA/Fe(II)/SPC systems indicated that the addition of CIT or OA indeed enhanced the continuous production of HO center dot and enabled the intensity of HO center dot to be more stable. The results demonstrated that CIT and OA significantly improved the PCE degradation efficiency by increasing the concentration of Fe(II) and maintaining the concentration of HO center dot radicals in solution. In conclusion, chelated Fe(II)-based catalyzed SPC oxidation process shows enormous practical prospects for the remediation of PCE-contaminated groundwater because of the effectiveness without pre-adjusting the solution pH and complete mineralization in Fe(II)/SPC, CIT/Fe(II)/SPC and OA/Fe(II)/SPC systems. (C) 2015 Elsevier B.V. All rights reserved.