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Preparation and evaluation of superparamagnetic core–shell dummy molecularly imprinted polymer for recognition and extraction of organophosphorus pesticide

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Abstract

In this paper, we reported a simple and effective strategy to synthesize core–shell dummy template magnetic molecularly imprinted polymers (Fe3O4@DMIPs) using ethyl paraoxon as a template for the recognition and selective extraction of organophosphorus pesticide. Initially, monodisperse Fe3O4 nanoparticles were synthesized directly through a facile one-pot hydrothermal method. Then, the imprinted layer was synthesized directly on the surface of the magnetic core by means of a one-pot sol–gel copolymerization which avoided further modification of the external part of the magnetic core. The structure and morphology of the materials (Fe3O4@DMIPs) were characterized by SEM, TEM, FTIR, XRD, and VSM. It was observed that Fe3O4@DMIPs showed regular morphology, good dispersibility, and superparamagnetism. The synthesis conditions for the formation of Fe3O4@DMIPs were systematically investigated. It was found that the morphology and monodispersity of Fe3O4@DMIPs were highly influenced by the ratio of the mixture solvent of methanol and water and the volume ratio of functional monomer (APTES) and cross-linker (TEOS). The binding performance of the imprinted polymers was investigated through a series of adsorption experiments, which indicated that the Fe3O4@DMIPs had a fast adsorption rate (15 min) and high adsorption capacity (195.7 mg g−1) to methyl parathion and phoxim. Meanwhile, real wine sample tests demonstrated a good extraction effect. This study provides a possibility for the selective extraction of organophosphorus pesticide residue in a complex matrix.

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Acknowledgements

We gratefully acknowledge the Commonwealth Scientific Foundation for Industry of Chinese Inspection and Quarantine (No. 201210071) of the Ministry of National Science and Technology of China.

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Authors and Affiliations

  1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, Anhui, China

    Mengxing Wei, Xiangyang Yan & Shaomin Liu

  2. Technology Center, Anhui Entry-Exit Inspection and Quarantine Bureau, Hefei, 230022, Anhui, China

    Yuxin Liu

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  1. Mengxing Wei
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Correspondence to Shaomin Liu or Yuxin Liu.

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Wei, M., Yan, X., Liu, S. et al. Preparation and evaluation of superparamagnetic core–shell dummy molecularly imprinted polymer for recognition and extraction of organophosphorus pesticide. J Mater Sci 53, 4897–4912 (2018). https://doi.org/10.1007/s10853-017-1935-3

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