Effect of benzoic acid on the removal of 1,2-dichloroethane by a siderite-catalyzed hydrogen peroxide and persulfate system
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Benzoic acid can affect the iron-oxide mineral dissolution and react with hydroxyl radical. This study investigated its effect on 1,2-dichloroethane removal process by siderite-catalyzed hydrogen peroxide and persulfate. The variation of benzoic acid concentrations can affect pH value and soluble iron concentrations; when benzoic acid varied from 0 to 0.5 mmol/L, pH increased while Fe2+ and Fe3+ concentrations decreased, resulting in 1,2-dichloroethane removal efficiency which decreased from 91.2 to 5.0 %. However, when benzoic acid varied from 0.5 to 10 mmol/L, pH decreased while Fe2+ and Fe3+ concentrations increased, resulting in 1,2-dichloroethane removal efficiency which increased from 5.0 to 83.4 %.
Keywords1,2-dichloroethane Benzoic acid Siderite Hydroxyl radical Peroxide hydrogen Persulfate
This work was financially supported by the National Natural Science Foundation of China (NSFC) (41272268) and the Special Fund for Public Interest research support by the Ministry of Environmental Protection (201309001-3). The authors also acknowledge Qiang Xue and Ni Yan for editing this manuscript.
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