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Simultaneous remediation of three neonicotinoids in soil using nanoscale zero-valent iron-activated persulfate process: Performance, effect of process parameters, and mechanisms

文献类型： 外文期刊

作者： Zou, Ziyu 1 ; Zhao, Ercheng 2 ; Yu, Pingzhong 2 ; Jing, Junjie 2 ; Li, Ying 2 ; Li, Baotong 1 ; Wu, Junxue 2 ;

作者机构： 1.Jiangxi Agr Univ, Coll Agr Sci, Nanchang 330045, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Plant Protect, Beijing 100097, Peoples R China

关键词： Neonicotinoids; Degradation; Soil remediation; Nanoscale zero-valent iron; Persulfate

期刊名称：PROCESS SAFETY AND ENVIRONMENTAL PROTECTION （ 影响因子：7.926； 五年影响因子：7.717 ）

ISSN： 0957-5820

年卷期： 2022 年 167 卷

页码：

收录情况： SCI

摘要： Neonicotinoids are commonly used pesticides in agricultural regions all over the world, and their widespread use has caused potential environmental pollution issues in recent years. The simultaneous degradation of three representative neonicotinoids (i.e., imidacloprid (IMI), thiamethoxam (TMX) and dinotefuran (DIN)) in soil by a nanoscale zero-valent iron-activated persulfate (nZVI-activated PS) process was investigated. Under the optimum conditions with 1 mg g(-1) nZVI, 10 mM PS at an initial pH value of 6.9 and a water-soil ratio of 1.5, the degradation efficiency of IMI, TMX and DIN reached 89%, 86% and 69% in 15 mins, respectively. Degradation of the three neonicotinoids was fitted with a pseudo first-order kinetic model. High nZVI dosage and PS concen-tration were found to enhance the neonicotinoids degradation. In contrast, the presence of Cl-, HCO3- and HA reduced the degradation rates of the three neonicotinoids. Soil physicochemical properties showed a significant effect on the degradation efficiencies of the three neonicotinoids. In addition, quenching experiments combined with electron paramagnetic resonance (EPR) showed that free radicals SO4 center dot- and center dot BULL;OH contributed to the degra-dation of three neonicotinoids in the nZVI-activated PS system. Degradation pathways were proposed based on identified intermediates of IMI, TMX and DIN. Overall, the nZVI-activated PS process is an effective method for remediation of the neonicotinoids contaminated soil.

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