Efficient degradation of imidacloprid in soil by thermally activated persulfate process: Performance, kinetics, and mechanisms

文献类型： 外文期刊

第一作者： Zou, Ziyu

作者： Zou, Ziyu;Huang, Xin;Guo, Xingle;Jia, Chunhong;Zhao, Ercheng;Wu, Junxue;Li, Baotong

作者机构：

关键词： Imidacloprid; Soil; Persulfate; Degradationmechanisms

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：7.129； 五年影响因子：7.284 ）

ISSN： 0147-6513

年卷期： 2022 年 241 卷

页码：

收录情况： SCI

摘要： Imidacloprid (IMI) as a first-generation commercial neonicotinoid has been frequently detected in the environment in recent years. In this study, the efficient degradation of IMI in soil by a thermally activated persulfate (PS) process was investigated. The degradation efficiencies of IMI were in the range of 82-97% with the dosage of 10 mM, when the initial concentrations of IMI were 5-50 mg/kg in the soil. Degradation of the IMI was fitted with a pseudo-first-order kinetic model under different reaction temperatures. Inhibition effects of common inorganic anions on the IMI degradation in the system followed the order Cl- > HCO3 - > H2PO4- > NO3-. Soil pH and soil organic matter were also main factors affecting the degradation of IMI. The degradation effi-ciencies (64-97%) of three other typical neonicotinoids (acetamiprid, clothianidin, and dinotefuran) indicated that the thermally activated persulfate process could be used for remediation of neonicotinoid-contaminated soil. Quenching experiments indicated that the major reactive species in IMI degradation were SO4 center dot -, O-2(center dot -), and center dot OH. degradation intermediates of IMI were inferred in the soil, and degradation pathways of IMI included hydrox-ylation, denitrification, C-N bond break and further oxidation.

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