Superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by PSA and preparing method and application thereof

The invention provides a superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA and a preparing method and application of the superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA. According to the superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA and the preparing method and application of the superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA, silylanization is conducted on the surface of superparamagnetic nanoparticle Fe3O4, a silylating reagent with a PSA structure is bonded, and thus a PSA group is introduced. The superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA and the preparing method of the superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA can be applied to the magnetic solid-phase extraction (M-SPE) field, and the superparamagnetic nanoparticle Fe3O4@SiO2@PSA modified by the PSA can serve as an adsorbent which is frequently used for magnetic solid-phase extraction, be applied to various pesticides such as carbamic acid ester, the organophosphorus pesticide and the herbicide and be used for absorption and extraction of target objects such as sulfonamides, organic acid and saccharides; meanwhile, the functional group of the PSA is a good binary ligand, in this way, the PSA is a good chelation material, can be used for extraction of metal ions and has high practical value and broad application prospect in the aspect of analytical investigation.