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A Magnetic Zeolitic Imidazolate Framework Nanohybrid for Fast and Efficient Extraction of Clothianidin, Imidacloprid, Acetamiprid, and Thiacloprid in Water.
Journal of Nanoscience and Nanotechnology 2019 June 2
A magnetic zeolitic imidazolate framework nanohybrid (Fe₃O₄/ZIF-8) was synthesized and applied as an efficient magnetic solid-phase extraction (MSPE) adsorbent for fast adsorption and separation of clothianidin, imidacloprid, acetamiprid, and thiacloprid from various water samples. Fe₃O₄ and ZIF-8 were combined via a simple modified in situ method and the obtained nanohybrid (Fe₃O₄/ZIF-8) showed both excellent adsorption capacity and convenient magnetic property. ZIF-8 was found to play a dominant role in adsorbing the analytes and π-π interaction was found to be the main adsorption mechanism of analytes by Fe₃O₄/ZIF-8. Parameters affecting the MSPE efficiency, such as the Fe₃O₄ amount loaded onto the ZIF-8, salt and pH of the sample solution, extraction time, and the type and volume of desorption solvent, were systematically evaluated. Under the optimum conditions, the developed MSPE coupled with LC-MS/MS achieved good linearities (R² > 0.9940) in the range of 10-800 μg L-1 with low limits of detection (0.03-0.3 μg L-1 ) and satisfactory recoveries of 79.5-108.2% with relative standard deviations (RSDs) <10%. The method was successfully applied to monitor various water samples and conclusively highlighted the excellent flexibility and practicability of Fe₃O₄/ZIF-8 for analyzing emerging environmental contaminants in various types of water samples.
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