文献类型：期刊文献

英文题名：The destruction of benzene by calcium peroxide activated with Fe(II) in water

作者：Xue, Yunfei[1];Gu, Xiaogang[1];Lu, Shuguang[1];Miao, Zhouwei[1,2];Brusseau, Mark L.[2];Xu, Minhui[1];Fu, Xiaori[1];Zhang, Xiang[1];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]Univ Arizona, Soil Water & Environm Sci Dept, Sch Earth & Environm Sci, 429 Shantz Bldg, Tucson, AZ 85721 USA

年份：2016

卷号：302

起止页码：187

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20162102419002);WOS:【SCI-EXPANDED(收录号:WOS:000382590900020)】；

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 Brusseau were supported by the NIEHS Superfund Research Program (P42 ES04940).

语种：英文

外文关键词：Calcium peroxide; Benzene; Ferrous iron; Reactive oxygen species

摘要：The ability of Fe(II)-activated calcium peroxide (CaO2) to remove benzene is examined with a series of batch experiments. The results showed that benzene concentrations were reduced by 20-100% within 30 min. The magnitude of removal was dependent on the CaO2/Fe(II)/Benzene molar ratio, with much greater destruction observed for ratios of 4/4/1 or greater. An empirical equation was developed to quantify the destruction rate dependence on reagent composition. The presence of oxidative hydroxyl radicals (HO") and reductive radicals (primarily O-2(center dot-)) was identified by probe compound testing and electron paramagnetic resonance (EPR) tests. The results of the EPR tests indicated that the application of CaO2/Fe(II) enabled the radical intensity to remain steady for a relatively long time. The effect of initial solution pH was also investigated, and CaO2/Fe(II) enabled benzene removal over a wide pH range of 3.0-9.0. The results of radical scavenging tests showed that benzene removal occurred primarily by HO" oxidation in the CaO2/Fe(II) system, although reductive radicals also contributed. The intermediates in benzene destruction were identified to be phenol and biphenyl. The results indicate that Fe(II)-activated CaO2 a feasible approach for treatment of benzene in contaminated groundwater remediation. (C) 2016 Elsevier B.V. All rights reserved.