Abstract
In this work, an octahedral magnetic metal organic frameworks composed of Fe3O4@NH2-MIL-101 was synthesized through simple solvothermal reaction for magnetic solid phase extraction (MSPE) of six pesticides with benzene ring in environmental water samples. The Fe3O4@NH2-MIL-101 was characterized by various techniques. The results showed Fe3O4@NH2-MIL-101 exhibits ultra-high surface area (1012.7 m2 g−1), large pore volume (0.64 cm3 g−1) and high magnetic responsivity (30.0 emu g−1), which can be used as an ideal adsorbent for rapid isolation and enrichment of target analytes. A sensitive method was developed by using Fe3O4@NH2-MIL-101-based MSPE coupled with HPLC (High performance liquid chromatography) with UV (Ultraviolate) detector. The linear range extended to 1000 µg L−1 was achieved, low limits of detection (S/N = 3) of 0.13–0.86 µg L−1 and good reproducibility (1.8–3.1%). The applicability of Fe3O4@NH2-MIL-101 was demonstrated for determining six pesticides in water samples with satisfactory recoveries at two spiking levels of 20.0, 80.0 µg L−1 were in the range of 70.5 to 119.8% with the RSDs less than 8.1%. These accurate experimental results by this method indicated that the novel Fe3O4@NH2-MIL-101 as a MSPE adsorbent was an attractive option for efficient extraction and enrichment trace pesticides in future.
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Acknowledgements
This work was generously supported by National Natural Science Foundation of China (Nos. 21467028 and 21777129); the Innovative Team of Ministry of Education of China (IRT15R56); the Talent Project of Innovation and entrepreneurship in Lanzhou, China (Grant No. 2018-RC-40).
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Wang, X.M., Kou, H., Wang, J. et al. An octahedral magnetic metal organic frameworks for efficient extraction and enrichment of six pesticides with benzene ring prior to high performance liquid chromatography analysis. J Porous Mater 27, 1171–1177 (2020). https://doi.org/10.1007/s10934-020-00895-z
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DOI: https://doi.org/10.1007/s10934-020-00895-z