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

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

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

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 20-100% 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.

Original languageEnglish (US)
Pages (from-to)187-193
Number of pages7
JournalChemical Engineering Journal
Volume302
DOIs
StatePublished - Oct 15 2016

Keywords

  • Benzene
  • Calcium peroxide
  • Ferrous iron
  • Reactive oxygen species

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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