Fluoroquinolones (FQs) antibiotics, one of the leading environmental pollutants, have ecotoxic effects that can accumulate through ecosystems and harm human health. The determination of FQs is still difficult due to the complex matrix, many interfering factors, and low concentration. Hence, a magnetic microporous organic network (MON) composite denoted as Fe3O4@MON-NH2@CM-β-CD with excellent FQs adsorption performance was prepared by β-CD covalent modification of MON. Based on the existence of π-π packing, hydrophobic interaction, and hydrogen bonding between Fe3O4@MON-NH2@CM-β-CD and FQs, a new magnetic solid phase extraction (MSPE) method for the enrichment of FQs was developed. Under optimized MSPE conditions, five FQs were detected by HPLC-UV with good linearity (R2≥0.9989) in the range of 0.02-1 μg mL-1, and the detection limits (S/N=3) in the range of 0.0014-0.0023 μg mL-1. The satisfactory recoveries ranged from 93.1-116.2% with the RSDs lower than 8.39% when applied to actual environmental water samples. These results revealed that Fe3O4@MON-NH2@CM-β-CD as an adsorbent for MSPE had excellent performance for FQs extraction from real samples, and the MON material types were expanded through the functionalization of MON, which would have great potential for further application in various analytical methods.

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