Degradation of Toluene by a Selective Ferrous Ion Activated Persulfate Oxidation Process

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Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
Jiangxi Science and Technology Normal University, Jiangxi, 330013, China
*Tel.: + 86 27 68775837. Fax: + 86 27 68778893. E-mail: [email protected]
Cite this: Ind. Eng. Chem. Res. 2014, 53, 3, 1033–1039
Publication Date (Web):December 24, 2013
https://doi.org/10.1021/ie402633n
Copyright © 2013 American Chemical Society
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Abstract

The Fe2+-activated persulfate (PS) oxidation of toluene was evaluated using single-factor tests and response surface methodology (RSM). The results indicated the degradation efficiency increased as the PS and Fe2+ concentrations increased, while excessive dosages inhibited the degradation efficiency. The pH had an insignificant effect on the degradation of toluene. Based on the RSM optimization approach, the degradation efficiency reached a maximum of 84.4%. The main intermediates were also separated and identified by GC–MS, and a plausible degradation pathway of toluene was proposed. Further studies of surfactant recovery from flushing effluents mixed with toluene and surfactant were explored. Compared with the Fe2+/H2O2 process, a great enhancement of the toluene degradation efficiency and lower sodium dodecyl sulfate (SDS) degradation efficiency were obtained by the Fe2+/PS process. The results demonstrated that the Fe2+/PS selective oxidation process could be used for SDS recovery and for the degradation of contaminants present in soil flushing effluents.

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Data for independently examined variables; analysis of data and plots for toluene degradation efficiency; soil toluene removal efficiencies; GC chromatograms at different times of reaction. This material is available free of charge via the Internet at http://pubs.acs.org.

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