In situ remediation of ortho-nitrochlorobenzene in soil by dual oxidants (hydrogen peroxide/persulfate)
2016
Liu, Zhonghua | Guo, Weilin | Han, Xuemei | Li, Xianghui | Zhang, Ke | Qiao, Zhuangming
The efficacies of catalyzed H₂O₂, activated persulfate, and catalyzed H₂O₂-persulfate processes for the degradation of ortho-nitrochlorobenzene (o-NCB) in soil were investigated. The application of catalyzed H₂O₂-persulfate process was promising, and after a careful adjustment of oxidants and activator doses, it demonstrated a considerable improvement in o-NCB degradation compared with activated persulfate process and catalyzed H₂O₂ process. The degradation of o-NCB in catalyzed H₂O₂-persulfate process was obviously influenced by the concentration of persulfate and H₂O₂, the molar ratio between persulfate and H₂O₂, the concentration of o-NCB, and initial pH. Degradation of o-NCB was obviously inhibited by the addition of tert-butyl alcohol, methanol, and phenol, suggesting that nitrobenzene was dominantly oxidized by HO· and SO₄ ⁻· generated in the catalyzed H₂O₂-persulfate process. The results from these studies demonstrated that the natural iron species present in soil could effectively facilitate the degradation of organic pollutants in the presence of H₂O₂ and persulfate.
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