In this study, magnetic FeO-coated metal-organic framework composites, CONH-MIL-101(Cr)/FeO, were synthesized by depositing FeO particles on the surface of amidated MIL-101(Cr). The scanning electron microscope images show that the MIL-101(Cr) crystals were uniformly coated by FeO particles. The magnetic hysteresis curve of CONH-MIL-101(Cr)/FeO reveals a saturated magnetization value of 23.47 emu/g. The water contact angle decreases from 61.00° to 12.88° after amidation and FeO coating. The magnetic solid-phase extraction (MSPE) efficiency of CONH-MIL-101(Cr)/FeO for benzoic acid derivatives was studied. Under optimal conditions, the adsorption and desorption processes can be completed within 5 min, and the maximum adsorption capacity to protocatechuic acid (PCA) and vanillic acid (VA) is 10.31 and 17.30 mg/g. Coupling the MSPE with high-performance liquid chromatography-ultraviolet detection, the detection limit for PCA and VA was 0.29 and 0.58 ng/mL, respectively. The mean recoveries of PCA and VA in spiked samples ranged from 82.85%-91.27% with relative standard deviations lower than 0.33%-5.33%. This study provides inspiration for the fabrication of novel magnetic sorbents, and a reliable method for the adsorption and analysis of benzoic acid derivatives.
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