Study on the Preparation and Adsorption Property of Magnetic Graphene Oxide Nonylphenol Molecularly Imprinted Polymer

A molecularly imprinted polymer (MIP), which showed specific adsorption property toward nonylphenol (NP), was prepared through surface polymerization using magnetic graphene oxide (Fe3O4@GO) as the carrier, 2-vinyl pyridine as the functional monomer and ethyleneglycol dimethacrylate as the cross-linking agent. The results of electron microscopy characterization and static adsorption experiments showed that the prepared MIP was modified on the surface of the Fe3O4@GO and the polymer showed good adsorption properties toward NP with the maximum adsorption capacity of 27.99 g·kg-1. The enrichment and determination of NP in plastic bags for milk was performed by HPLC with the prepared MIP as solid-phase extractant, acetonitrile as sample solvent and a mixture of methanol and acetic acid (9+1) as eluent. The linear range of the mass concentration of NP was 2.0-100 μg·L-1 and detection limit (3S/N) was 0.34 μg·kg-1. Recovery obtained by standard addition method were in the range of 86.1%-95.2% and RSD′s (n=5) were less than 5.0%.