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Activation of persulfate and removal of ethyl-parathion from soil: Effect of microwave irradiation.
Chemosphere ( IF 8.1 ) Pub Date : 2020-04-06 , DOI: 10.1016/j.chemosphere.2020.126679 Duo Miao 1 , Song Zhao 1 , Kecheng Zhu 1 , Peng Zhang 2 , Tiecheng Wang 1 , Hanzhong Jia 1 , Hongwen Sun 2
Chemosphere ( IF 8.1 ) Pub Date : 2020-04-06 , DOI: 10.1016/j.chemosphere.2020.126679 Duo Miao 1 , Song Zhao 1 , Kecheng Zhu 1 , Peng Zhang 2 , Tiecheng Wang 1 , Hanzhong Jia 1 , Hongwen Sun 2
Affiliation
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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 °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 OH and SO4- were observed in the microwave/persulfate system. Quenching experiments suggested that ethyl-parathion was degraded by the generated OH and SO4-. 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.
中文翻译：
过硫酸盐的活化和土壤中对硫磷的去除：微波辐射的影响。
先进的过硫酸盐氧化技术被广泛用于超级基金场所的有机污染控制。近年来，微波辐射已被证明是一种过硫酸盐活化的有前途的方法。但是，先前的大多数工作都集中在污水的处理上，但是针对污染场地的报道很少，特别是关于使用微波活化的过硫酸盐技术修复农药污染场地的知识。在这项研究中，开发了一种有效的活化/氧化方法来修复受农药污染的土壤，即微波/过硫酸盐，以处理含有对硫磷的土壤。优化了过硫酸盐的浓度，反应温度和时间。结果表明，添加0最多可去除77.32％的对硫磷。微波温度为60°C时土壤为1 mmol·过硫酸盐·g-1。相比之下，在水浴活化过硫酸盐的条件下，在相同反应温度下除去了19.43％的乙基对硫磷。电子顺磁共振（EPR）光谱结合自旋俘获技术用于检测反应性氧化物质，并且在微波/过硫酸盐体系中观察到OH和SO4-。淬火实验表明，乙基对硫磷被生成的OH和SO4-降解。气相色谱-质谱（GC-MS）分析确定对氧磷，苯基磷酸，4-硝基苯酚，磷酸二甲酯磷酸酯和一些烷烃是主要的氧化产物。这项研究中提出了可能的乙基对硫磷降解途径。
更新日期：2020-04-06
中文翻译：
过硫酸盐的活化和土壤中对硫磷的去除：微波辐射的影响。
先进的过硫酸盐氧化技术被广泛用于超级基金场所的有机污染控制。近年来，微波辐射已被证明是一种过硫酸盐活化的有前途的方法。但是，先前的大多数工作都集中在污水的处理上，但是针对污染场地的报道很少，特别是关于使用微波活化的过硫酸盐技术修复农药污染场地的知识。在这项研究中，开发了一种有效的活化/氧化方法来修复受农药污染的土壤，即微波/过硫酸盐，以处理含有对硫磷的土壤。优化了过硫酸盐的浓度，反应温度和时间。结果表明，添加0最多可去除77.32％的对硫磷。微波温度为60°C时土壤为1 mmol·过硫酸盐·g-1。相比之下，在水浴活化过硫酸盐的条件下，在相同反应温度下除去了19.43％的乙基对硫磷。电子顺磁共振（EPR）光谱结合自旋俘获技术用于检测反应性氧化物质，并且在微波/过硫酸盐体系中观察到OH和SO4-。淬火实验表明，乙基对硫磷被生成的OH和SO4-降解。气相色谱-质谱（GC-MS）分析确定对氧磷，苯基磷酸，4-硝基苯酚，磷酸二甲酯磷酸酯和一些烷烃是主要的氧化产物。这项研究中提出了可能的乙基对硫磷降解途径。
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