Facile and tunable fabrication of Fe3O4/graphene oxide nanocomposites and their application in the magnetic solid-phase extraction of polycyclic aromatic hydrocarbons from environmental water samples

► Prepare Fe3O4/graphene oxide nanocomposites through electrostatic self-assembly. ► The different loading amounts of Fe3O4 on graphene oxide was easily controlled. ► Fe3O4/GO nanocomposites showed excellent performance for the extraction of PAHs.