College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
J Hazard Mater. 2021 Jan 5;401:123361. doi: 10.1016/j.jhazmat.2020.123361. Epub 2020 Jul 1.
Contaminated sites from pesticide industry have attracted global concern due to the characteristics of organic pollution with high concentrations and complete loss of habitat conditions. Remediation of organophosphorus pesticide polluted soil using microwave-activated persulfate (MW/PS) oxidation was investigated in this study, with parathion as the representative pesticide. Approximately 90 % of parathion was degraded after 90 min of MW/PS oxidation treatment, which was superior to those by single PS or MW treatment. Relatively greater performances for parathion degradation were obtained in a relatively larger PS dosage, higher microwave temperature, and lower organic matter content. Appropriate soil moisture favored parathion degradation in soil. SO, OH, O, and O generated in the MW/PS system all contributed to parathion degradation. Multiple spectroscopy analyses indicated that PO and PS bonds in parathion were destroyed after MW/PS oxidation, accompanied by generation of hydroxylated and carbonylated byproducts. The soil safety after parathion degradation was assessed via model prediction. Furthermore, MW/PS oxidation also exhibited great performance for degradation of other organophosphorus pesticides, including ethion, phorate, and terbufos.
受有机污染且浓度高、生境条件完全丧失等特点的影响，农药行业污染场地受到了全球关注。本研究采用微波活化过硫酸盐（MW/PS）氧化法对有机磷农药污染土壤进行修复，以对硫磷作为代表性农药。在 MW/PS 氧化处理 90min 后，约 90%的对硫磷得以降解，其效果优于单独使用 PS 或 MW 的处理。在较大的过硫酸盐用量、较高的微波温度和较低的有机物含量条件下，对硫磷的降解性能相对较好。适当的土壤湿度有利于土壤中对硫磷的降解。MW/PS 体系中生成的 SO、OH、O 和 O 均有助于对硫磷的降解。多种光谱分析表明，MW/PS 氧化后对硫磷中的 PO 和 PS 键被破坏，同时生成了羟基化和羰基化的副产物。通过模型预测评估了对硫磷降解后土壤的安全性。此外，MW/PS 氧化法对其他有机磷农药，如乙拌磷、甲拌磷和特丁磷的降解也表现出了很好的效果。
