Enrichment of polychlorinated biphenyl 28 from aqueous solutions using Fe3O4 grafted graphene oxide

In this paper, Fe 3 O 4 nanoparticle (Fe 3 O 4 NPs) grafted graphene oxide (Fe 3 O 4 @GO), are successfully synthesized and used for the extraction of 2,4,4′-trichlorobiphenyl (PCB 28) from a large volume of water solution. With the magnetic solid-phase extraction (MSPE) technique based on the Fe 3 O 4 @GO sorbents, it requires only 30   min to extract trace levels of PCB 28 from 200   mL water samples. The Fe 3 O 4 @GO was analyzed by using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier Transform infrared (FT-IR) spectroscopy, and Vibrating sample magnetometer (VSM), specific surface area analyzer. The adsorption kinetics, adsorption capacity of the adsorbent, and the effect of the solution pH and desorption conditions on the removal efficiency of PCB 28 were investigated. The second-order kinetic equation best describes the sorption kinetics. The results showed that Fe 3 O 4 @GO was a suitable material in the pre-concentration and immobilization of PCB 28 from large volumes of aqueous solutions in polychlorinated biphenyl pollution cleaning.