In this study, a novel metal-organic framework (M-ZIF-8@ZIF-67) was successfully prepared using the single layer Fe₃O₄-ZIF-8 as magnetic core and wrapped a layer of ZIF-67 outer. This M-ZIF-8@ZIF-67 was employed as an adsorbent for the adsorption and removal of fipronil and its metabolites from environmental water and cucumber samples. The characterization results suggested that M-ZIF-8@ZIF-67 has the double layer structure a polyhedral structure with uniform pores, while ZIF-67 was successfully coated on the surface of Fe₃O₄-ZIF-8. The unique structure endowed M-ZIF-8@ZIF-67 a high surface area (219 m²/g) and high adsorption capacity for fipronil, fipronil desulfinyl, fipronil sulfide and fipronil sulfone. To our knowledge, this is the first report detailing the adsorption properties of M-ZIF-8@ZIF-67 with double layer structure relating to the adsorption and removal of pesticides. Furthermore, the adsorption model analysis demonstrated that the static adsorption data fitted the Freundlich bimolecular layer adsorption model better than the Langmuir monolayer adsorption model. This study indicates that M-ZIF-8@ZIF-67 has significant potential in the adsorption and removal of fipronil and its metabolites in water and vegetable samples.

本研究以单层Fe ₃ O ₄ -ZIF-8为磁芯，外层包裹一层ZIF-67，成功制备了新型金属有机骨架材料(M-ZIF-8@ZIF-67)。该M-ZIF-8@ZIF-67被用作吸附剂，用于从环境水和黄瓜样品中吸附和去除氟虫腈及其代谢物。表征结果表明M-ZIF-8@ZIF-67具有双层结构和均匀孔隙的多面体结构，同时ZIF-67成功包覆在Fe ₃ O ₄ -ZIF-8表面。独特的结构赋予M-ZIF-8@ZIF-67高比表面积（219 m ² /g）以及对氟虫腈、氟虫腈脱硫酰、氟虫腈硫化物和氟虫腈砜的高吸附能力。据我们所知，这是第一篇详细介绍双层结构M-ZIF-8@ZIF-67与农药吸附和去除相关的吸附特性的报告。此外，吸附模型分析表明，静态吸附数据比Langmuir单分子层吸附模型更符合Freundlich双分子层吸附模型。本研究表明M-ZIF-8@ZIF-67在吸附和去除水和蔬菜样品中氟虫腈及其代谢物方面具有显着潜力。