文献类型：期刊文献

英文题名：Benzene oxidation by Fe(III)-activated percarbonate: matrix-constituent effects and degradation pathways

作者：Fu, Xiaori[1,2];Gu, Xiaogang[1];Lu, Shuguang[1];Sharma, Virender K.[2];Brusseau, Mark L.[3];Xue, Yunfei[1];Danish, Muhammad[1];Fu, George Y.[4];Qiu, Zhaofu[1];Sui, Qian[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Texas A&M Univ, Sch Publ Hlth, Dept Environm & Occupat Hlth, 1266 TAMU, College Stn, TX 77843 USA;[3]Univ Arizona, Sch Earth & Environm Sci, Soil Water & Environm Sci Dept, 429 Shantz Bldg, Tucson, AZ 85721 USA;[4]Georgia Southern Univ, Dept Construct Management & Civil Engn Technol, Statesboro, GA 30460 USA

年份：2017

卷号：309

起止页码：22

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20164302937819);WOS:【SCI-EXPANDED(收录号:WOS:000389166400004)】；

基金：This study was financially supported by the grant from the National Natural Science Foundation of China (41373094, 21577033 and 51208199), Natural Science Foundation of Shanghai (16ZR1407200), China Postdoctoral Science Foundation (2015M570341), and the Fundamental Research Funds for the Central Universities (222201514339 and 22A201514057). The contributions of Mark L. Brusseaub were supported by the NIEHS Superfund Research Program (P42 ES04940). Virender K. Sharma acknowledge the support of United States National Science Foundation (CBET-1439314).

语种：英文

外文关键词：Percarbonate; Fe(III); Benzene; Organic compound radical (R-center dot); Reactive oxygen species; Groundwater remediation

摘要：Complete degradation of benzene by the Fe(III)-activated sodium percarbonate (SPC) system is demonstrated. Removal of benzene at 1.0 mM was seen within 160 min, depending on the molar ratios of SPC to Fe(III). A mechanism of benzene degradation was elaborated by free-radical probe-compound tests, free-radical scavengers tests, electron paramagnetic resonance (EPR) analysis, and determination of Fe(II) and H2O2 concentrations. The degradation products were also identified using gas chromatography-mass spectrometry method. The hydroxyl radical (HO center dot) was the leading species in charge of benzene degradation. The formation of HO center dot was strongly dependent on the generation of the organic compound radical (R-center dot) and superoxide anion radical (O-2(center dot-)). Benzene degradation products included hydroxylated derivatives of benzene (phenol, hydroquinone, benzoquinone, and catechol) and aliphatic acids (oxalic and fumaric acids). The proposed degradation pathways are consistent with radical formation and identified products. The investigation of selected matrix constituents showed that the Cl and HCO3- had inhibitory effects on benzene degradation. Natural organic matter (NOM) had accelerating influence in degrading benzene. The developed system was tested with groundwater samples and it was found that the Fe(III)-activated SPC has a great potential in effective remediation of benzene contaminated groundwater while more further studies should be done for its practical application in the future because of the complex subsurface environment. (C) 2016 Elsevier B.V. All rights reserved.