期刊
CHEMICAL ENGINEERING JOURNAL
卷 302, 期 -, 页码 187-193出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.05.016
关键词
Calcium peroxide; Benzene; Ferrous iron; Reactive oxygen species
资金
- National Natural Science Foundation of China [41373094, 21577033, 51208199]
- Natural Science Foundation of Shanghai [16ZR1407200]
- China Postdoctoral Science Foundation [2015M570341]
- Fundamental Research Funds for the Central Universities [222201514339, 22A201514057]
- NIEHS Superfund Research Program [P42 ES04940]
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.
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