High crystalline magnetic covalent organic framework with three-dimensional grapevine structure for ultrasensitive extraction of nitro-polycyclic aromatic hydrocarbons in food and environmental samples

• Published in: Food chemistry Vol. 361; p. 130018
• Main Authors: Wang, Xiao-Xing, Liu, Lu, Wang, Xiao-Li, Xu, Gui-Ju, Zhao, Ru-Song, Wang, Ming-Lin, Lin, Jin-Ming, Wang, Xia
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2021
• Subjects: Crystalline magnetic covalent organic framework; Food and environmental samples; Grapevine-like structure; Magnetic solid-phase extraction; Nitrated-polycyclic aromatic hydrocarbons; Food and environmental samples; Crystalline magnetic covalent organic framework; Magnetic solid-phase extraction; Grapevine-like structure; Nitrated-polycyclic aromatic hydrocarbons
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2021.130018

•A novel high crystalline Fe3O4@TAPT-DMTA-COF with grapevine shape was fabricated.•Structural particularity made this own supermagnetism and lager surface area.•The method was faster and more sensitive for N-PAHs than existing methods.•This MSPE technique was applied to quantify N-PAHs in food and water samples.•Possible adsorption interaction mechanism was elucidated. Developing and establishing an efficient pre-treatment approach for the precise extraction of nitrated-polycyclic aromatic hydrocarbons (N-PAHs) from real-life samples is critical for ensuring their safety. In this study, a novel crystalline magnetic covalent organic framework with a grapevine structure not a single core–shell, Fe3O4@TAPT-DMTA-COF, was fabricated via chemical bonding. Unchanging the reticulated structure and high crystallinity of TAPT-DMTA-COF, the combination made this material possess not only simple operation via magnetic decantation but also remarkable chemical stability. Fe3O4@TAPT-DMTA-COF had a large surface area (1578.45 m2/g), and rich electronegative triazine-groups, which makes it become a superior magnetic enrichment material for trace N-PAHs. For N-PAHs analysis, low limits of detection (LODs) (1.43–17.24 ng/L), excellent relative standard deviations (RSDs ≤ 11.52%), and wide linearity (10–5000 ng/L) were obtained. Real-life applications based on this composite have been successfully explored by capturing the N-PAHs emitted from food and environmental samples.