期刊
CHEMOSPHERE
卷 253, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.126679
关键词
Microwave; Persulfate; Ethyl-parathion; Reactive oxygen species; Soil
资金
- National Key R&D Program of China [2018YFC1802004]
- Shaanxi Science Fund for Distinguished Young Scholars [2019JC-18]
- Science and Technology Major Project of Tianjin [18ZXSZSF00110]
- CAS Youth Innovation Promotion Association [2016380]
- Open Project of the State Key Laboratory of Pollution Control and Resource Reuse [PCRRF17020]
- One Hundred Talents program of Shaanxi Province [SXBR9171]
Advanced persulfate oxidation technology is widely used in organic pollution control of super fund sites. In recent years, microwave radiation has been proven a promising method for persulfate activation. However, most of the prior works were focused on the treatment of polluted water, but there are few reports aiming at contaminated sites, especially the knowledge of using microwave activated persulfate technology to repair pesticide-contaminated sites. In this study, an effective activation/oxidation method for the remediation of pesticide-contaminated soil, i.e., microwave/persulfate, was developed to treat soil containing ethyl-parathion. The concentration of persulfate, reaction temperature, and time were optimised. The results showed that up to 77.32% of ethyl-parathion was removed with the addition of 0.1 mmol.persulfate.g(-1) soil under the microwave temperature of 60 degrees C. In comparison, 19.43% of ethyl-parathion was removed at the same reaction temperature under the condition of water bath activated persulfate. Electron paramagnetic resonance (EPR) spectroscopy combined with spin-trapping technology was used to detect reactive oxidation species, and center dot OH and SO4-center dot were observed in the microwave/persulfate system. Quenching experiments suggested that ethyl-parathion was degraded by the generated center dot OH and SO4-center dot. Paraoxon, phenylphosphoric acid, 4-nitrophenol, dimethyl ester phosphate, and some alkanes were the dominant oxidative products identified by gas chromatography-mass spectrometry (GC-MS) analysis. A possible pathway for ethyl-parathion degradation was proposed in this study. The results obtained serve as the guidance to the development of remediation technologies involving persulfate and microwave for soil contaminated by organic contaminants such as pesticides. (C) 2020 Elsevier Ltd. All rights reserved.
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