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National Institute of Environmental Health Sciences

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Your Environment. Your Health.

Publication Detail

Title: The destruction of benzene by calcium peroxide activated with Fe(II) in water.

Authors: Xue, Yunfei; Gu, Xiaogang; Lu, Shuguang; Miao, Zhouwei; Brusseau, Mark L; Xu, Minhui; Fu, Xiaori; Zhang, Xiang; Qiu, Zhaofu; Sui, Qian

Published In Chem Eng J, (2016 Oct 15)

Abstract: 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 to 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 O2•-) 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 is a feasible approach for treatment of benzene in contaminated groundwater remediation.

PubMed ID: 28943778 Exiting the NIEHS site

MeSH Terms: No MeSH terms associated with this publication

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