Magnetic mesoporous polymelamine-formaldehyde resin as an adsorbent for endocrine disrupting chemicals
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A magnetic mesoporous poly(melamine-formaldehyde) composite (Fe3O4-mPMF) was prepared via grafting poly(melamine-formaldehyde) onto the surface of amino-functionalized magnetite (Fe3O4) nanoparticles. The material was characterized by scanning electron micrography, transmission electron microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, nitrogen adsorption-desorption isotherms, and thermogravimetric analysis. It has a large surface area, a typical mesoporous structure, and a high thermal stability. It was employed as a magnetic sorbent for the solid phase extraction of the following endocrine disrupting chemicals (EDCs): Bisphenol A, 4-tert-butylphenol, 4-tert-octylphenol and nonylphenol. The EDCs were then quantified by HPLC. Under the optimized conditions, the response to the EDCs is linear in the range of 0.5–100 ng·mL−1, and the limits of detection are 0.02–0.1 ng·mL−1. The high adsorption capability of the Fe3O4-mPMF is mainly attributed to multiple interactions including π-stacking, hydrogen bonding, and hydrophobic interactions. The method was applied to the extraction of EDCs from spiked river water and bottled juice samples. The results demonstrated that the Fe3O4-mPMF is an efficient adsorbent for the extraction of organic compounds with large conjugated π-system, plenty of hydrogen-bonding sites, and strong hydrophobicity.
KeywordsHigh-performance liquid chromatography Magnetic solid phase extraction Adsorption mechanism Fourier transform infrared spectra Powder X-ray diffraction Transmission electron microscopy X-ray photoelectron spectroscopy Magnetic adsorbent River water Bottled juice
Financial supports from the National Natural Science Foundation of China (31471643, 31571925, 31671930), the Hebei “Double First Class Discipline” Construction Foundation for the Discipline of Food Science and Engineering of Hebei Agricultural University (2016SPGCA18), the Natural Science Foundation of Hebei Province (B2016204136, B2016204146, B2017204025), the Scientific and Technological Research Foundation of the Department of Education of Hebei Province (ZD2016085) and the Natural Science Foundation of Hebei Agricultural University (LG201607) are gratefully acknowledged.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
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