Preparation of magnetic fluorine functionalized three-dimensional covalent organic framework and application of magnetic fluorine functionalized three-dimensional covalent organic framework in analysis of benzoylurea insecticides

By synthesizing magnetic fluorine-functionalized three-dimensional covalent organic frameworks at room temperature, the problems of harsh preparation process and low adsorption efficiency of 3D COFs were solved, realizing efficient adsorption and detection of benzoylurea pesticides in food and ensuring food safety.

CN120965955APending Publication Date: 2025-11-18SHANDONG ANALYSIS AND TEST CENTER
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Patent Information

Application Number
CN202511083392.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-04
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

The existing three-dimensional covalent organic frameworks (3D COFs) have demanding preparation processes, which limit their application in magnetic solid phase extraction (MSPE). Furthermore, conventional methods are difficult to efficiently adsorb benzoylurea pesticides, which affects food safety monitoring.

Method used

A magnetic fluorine-functionalized three-dimensional covalent organic framework (NH2-Fe3O4@F-3D COF) was synthesized at room temperature via a mixed ionic liquid-mediated Schiff base polymerization reaction. This framework enhances the adsorption performance of benzoylurea insecticides through fluorine-fluorine affinity and hydrogen bonding interactions.

Benefits of technology

A method for the efficient preparation of magnetic fluorine-functionalized 3D COFs at room temperature was developed. These COFs exhibit strong adsorption properties and can rapidly capture and detect benzoylurea pesticides in apple juice, grape juice, oolong tea, and black tea. They also feature low detection limits and high precision, making them suitable for the detection of trace pesticide residues in real food samples.

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Abstract

The invention belongs to the technical field of adsorbents, and discloses preparation of a magnetic fluorine functionalized three-dimensional covalent organic framework and application of the magnetic fluorine functionalized three-dimensional covalent organic framework in analysis of benzoylurea insecticides, and the preparation method of the magnetic fluorine functionalized three-dimensional covalent organic framework comprises the following steps: mixing an ammonia source, anhydrous sodium acetate, ferric chloride and ethylene glycol according to a ratio, and stirring uniformly; heating, violently stirring and premixing, and then heating and reacting for set time to obtain NH2-Fe3O4; the preparation method comprises the following steps: mixing and grinding tetra (4-aminophenyl) methane, 2, 3, 5, 6-tetrafluoro-p-dibenzaldehyde, NH2-Fe3O4, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide and 1-carboxymethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide according to a ratio, introducing nitrogen into a reaction system, emptying air, sealing, and reacting at 20-40 DEG C for 10-30 hours, so as to obtain the tetra (4-aminophenyl) methane, 2, 3, 5, 6-tetrafluoro-p-dibenzaldehyde, NH2-Fe3O4, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide and 1-carboxymethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide. And after the reaction is finished, extracting by using an organic solvent, and drying an extracting solution to obtain the NH2-Fe3O4-coated F-3D COF. The NH2-Fe3O4 (at) F-3D COF shows strong adsorption performance on the BUs through the interaction of fluorine-fluorine affinity and hydrogen bonds.
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