Application of carboxylated covalent organic magnetic framework material as magnetic solid-phase extraction adsorbent

Abstract

Disclosed is an application of a magnetic carboxyl-functionalized covalent organic framework composite as a magnetic solid-phase extraction adsorbent. The preparation method for this composite comprises the following steps: (1) firstly, taking dopamine hydrochloride as a coordinating stabilizer, and synthesizing surface-aminated magnetic iron oxide particles by coprecipitating iron (III) chloride and iron (II) chloride; and (2) then activating the surface-aminated magnetic iron oxide particles, and performing covalent cross-linking on the surfaces of the aminated magnetic iron oxide particles by taking 1, 3, 5-triformylphloroglucinol (Tp) and 4, 4′-diamino-biphenyl-2, 2′-dicarboxylic acid as building blocks, acting under the reversible catalytic action of acetic acid and using a solvothermal synthesis method, so as to prepare the magnetic carboxyl-functionalized covalent organic framework composite. The carboxyl-functionalized covalent organic framework prepared has a large specific surface area, a good mesoporous structure, a stable structure, large adsorption capacity, a short balance time and multiple adsorption forces, thereby significantly simplifying the sample pretreatment steps and shortening the sample processing time.

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