Novel FeO@metal-organic framework@polymer core-shell-shell nanospheres for fast extraction and specific preconcentration of nine organophosphorus pesticides from complex matrices.

Herein, a novel core-shell-shell magnetic nanosphere denoted as FeO@ZIF-8@polymer was fabricated by sequential in situ self-assembly and precipitation polymerization for effective magnetic solid-phase extraction of nine organophosphorus pesticides (OPPs) from river water, pear, and cabbage samples. The integrated FeO@ZIF-8@polymer featured convenient magnetic separation property and excellent multi-target binding ability. More importantly, the functional polymer coating greatly improved the extraction performance of FeO@ZIF-8 for OPPs, thus facilitating the simultaneous determination of trace OPP residues in real samples.

A "half" core-shell magnetic nanohybrid composed of zeolitic imidazolate framework and graphitic carbon nitride for magnetic solid-phase extraction of sulfonylurea herbicides from water samples followed by LC-MS/MS detection.

A "half" core-shell g-CN/FeO@ZIF-8 nanohybrid, in which FeO and zeolite imidazolate framework-8 (ZIF-8) constructed the core-shell structure, was successfully fabricated via a versatile in situ growth strategy. This nanohybrid was employed for simultaneous magnetic solid-phase extraction (MSPE) of trace levels of fifteen target sulfonylurea herbicides (SUHs) in environmental water samples followed by LC-MS/MS detection. CN nanosheets were first prepared by liquid exfoliation of bulk g-CN, after which FeO nanoparticles were uniformly deposited onto the surface of CN nanosheets, and ZIF-8 nanoparticles were grown on the surface of g-CN/FeO by anchoring Zn on g-CN/FeO.