Magnetic covalent organic framework material: synthesis and application as a sorbent for polycyclic aromatic hydrocarbons

Analytical methods

Xuxia Zhou¹  Xuexiang Shi²  Yongning Wu²  Guoliang Li²  Ning Li³  Jing Sun⁴  Yourui Suo⁴  Na Hu⁴  Di Wu⁵ 

[1] Department of Food Science and Technology, Zhejiang University of Technology,Hangzhou 310014,China;Key Laboratories of Chemical Safety and Health, China National Center for Food Safety Risk Assessment,Beijing 100050,China;Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University,Qufu 273165,China;Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences,Xining 810001,China;Yangtze Delta Region Institute of Tsinghua University,Zhejiang 314006,China

DOI  :  10.1039/C8AY01572D

学科分类：分析化学

来源: Royal Society of Chemistry

【 摘 要 】

A novel magnetic covalent organic framework (Fe3O4@COF(TpDA)) material possessing a large surface area and high and regular porosity was constructed via a facile strategy and applied as a magnetic solid phase extraction sorbent for the determination of trace polycyclic aromatic hydrocarbons in edible oil and grilled meats prior to high performance liquid chromatography with diode array detection. The obtained materials were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption isotherms and vibrating sample magnetometry. The prepared Fe3O4@COF(TpDA) materials showed some attractive features including a large surface area (180.20 m2 g−1) and high saturation magnetization (62.28 emu g−1). The experimental parameters affecting the extraction performance including the type of eluent, amount of sorbent, and adsorption and desorption times were optimized. Under the optimized conditions, the adsorption equilibrium for polycyclic aromatic hydrocarbons could be achieved in only 10 min. The proposed method achieved low limits of detection (0.03–0.73 μg L−1 for LODs and 0.10–2.43 μg L−1 for LOQs) and good linearity (R ≥ 0.9937). The obtained materials were successfully applied to enrich polycyclic aromatic hydrocarbons in edible oil and grilled meats and showed good accuracy with recoveries in the range of 85.5–104.2%. Furthermore, the proposed method was also evaluated by different adsorption kinetic theories, and the pseudo-second-order model can explain the adsorption kinetics. The proposed method is facile, rapid, effective and selective for determination of PAHs in food samples.

【 授权许可】

CC BY-NC