Construction of Stable Magnetic Vinylene-Linked Covalent Organic Frameworks for Efficient Extraction of Benzimidazole Fungicides.
Hongying GuoYang LiYijun LiXiwen HeLangxing ChenYukui ZhangPublished in: ACS applied materials & interfaces (2023)
Covalent organic frameworks (COFs) have attracted impressive interest in separation on aqueous media. Herein, we integrated the stable vinylene-linked COFs with magnetic nanosphere via the monomer-mediated in situ growth strategy to construct a crystalline Fe 3 O 4 @v-COF composite for enrichment and determination of benzimidazole fungicides (BZDs) from complex sample matrices. The Fe 3 O 4 @v-COF has a crystalline assembly, high surface area, porous character together with a well-defined core-shell structure, and serves as progressive pretreatment materials for magnetic solid phase extraction (MSPE) of BZDs. Adsorption mechanism studies revealed that the extended conjugated system and numerous polar cyan groups on v-COF provides abundant π-π and multiple hydrogen bonding sites, which are conducive to interact with BZDs collaboratively. Fe 3 O 4 @v-COF also displayed enrichment effects to various polar pollutions with conjugated structures and hydrogen-bonding sites. Fe 3 O 4 @v-COF-based MSPE-high-performance liquid chromatography exhibited the low limit of detection, wide linearity, and good precision. Moreover, Fe 3 O 4 @v-COF showed better stability, enhanced extraction performance, and more sustainable reusability in comparison with its imine-linked counterpart. This work proposes a feasible strategy on constructing the crystalline stable magnetic vinylene-linked COF composite for the determination of trace contaminants in complex food matrices.
Keyphrases
- molecularly imprinted
- solid phase extraction
- high performance liquid chromatography
- liquid chromatography tandem mass spectrometry
- liquid chromatography
- tandem mass spectrometry
- simultaneous determination
- gas chromatography mass spectrometry
- ultra high performance liquid chromatography
- gas chromatography
- room temperature
- ionic liquid
- mass spectrometry
- photodynamic therapy
- molecular docking
- high resolution mass spectrometry
- single cell
- high resolution
- label free
- molecular dynamics simulations
- risk assessment