Rational design and synthesis of magnetic covalent organic frameworks for controlling the selectivity and enhancing the
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ORIGINAL PAPER
Rational design and synthesis of magnetic covalent organic frameworks for controlling the selectivity and enhancing the extraction efficiency of polycyclic aromatic hydrocarbons Jing Yu 1 & Siyuan Di 1 & Tao Ning 1 & Hucheng Yang 1 & Gang-Tian Zhu 2 & Pin Chen 1 & Hao Yu 1 & Jiahao Wang 1 & Shukui Zhu 1 Received: 22 April 2020 / Accepted: 18 August 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A series of three-dimensional magnetic covalent organic frameworks were designed and synthesized via monomer selection, coating thickness optimization, and composite strategy transformation. Their structure properties including morphology, functional group, surface area, and pore size were characterized. The relationship between the structural properties and analytical performance was systematically investigated by density functional theory calculation and batch extraction experiments for polycyclic aromatic hydrocarbons. It is proven that the extractant modified by monomer 1,4-phthalaldehyde provides a hizgh affinity for high molecule weight polycyclic aromatic hydrocarbons and the right balance between extraction and elution efficiency. The relationship between coating thickness and mass transfer rate of polycyclic aromatic hydrocarbons was studied by accurate tuning of coating layers via layer-by-layer method. A mathematical model was derived and employed to determine that two coating layers were sufficient to provide the highest extraction efficiency with the shortest equilibrium time. The extractants synthesized by two different composite strategies (layer-by-layer and one-step) show opposite selectivity for polycyclic aromatic hydrocarbons. After optimization of the extraction conditions, dispersed solid-phase extraction coupled with gas chromatography-mass spectroscopy method was developed providing a wide linear range (5–500 ng L−1), good linearity (R2 > 0.9923), high precision in intra-day (RSD% < 8.2%) and inter-day (RSD% < 12.3%) detection, and low detection limits (1.5–15.1 ng L−1). The method was applied to the simultaneous determination of 16 polycyclic aromatic hydrocarbons with acceptable recoveries, which were 87–109% for groundwater, 83–116% for East Lake water, and 82–116% for Yangtze River water samples. Keywords Magnetic covalent organic framework . Polycyclic aromatic hydrocarbons . Dispersed solid-phase extraction . Structure-performance relationship . Water matrix
Introduction Dispersed solid-phase extraction (d-SPE) is a widely used pretreatment technique, which exploits magnetic Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04520-3) contains supplementary material, which is available to authorized users. * Shukui Zhu [email protected] 1
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People’s Republic of China
2
Key Laboratory of Tectonics and Petroleum Resources (Ministry of Education), China University of Geosciences, Wuhan 430075,
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