Synthesis, properties, and applications of magnetic graphene oxide/ nanocomposites and their photocatalytic activity under visible light irradiation: A Review

Graphene oxide is an emanating nanoparticle with diverse applications for energy storage, conversation and industrial wastewater treatment (adsorbent and photocatalysts) due to their outstanding electrical, thermal and chemical attributes.graphene oxide-based nanocomposites a hot area of investigation in the past decade because of their considerable mechanical, electrical, thermal, and barrier properties. Magnetic graphene oxide nanocomposites were prepared via a facile co-precipitation and hydrothermal methods and characterized by X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) and techniques and Bruner-Emmett-Teller (BET). The nanoparticles were found to have a size of 20-60 nm and were spread out on the graphene oxide nanosheets. Magnetic studies demonstrated that graphene oxide nanocomposites can be easily separated from the solution by an external magnetic field. The photocatalytic degradation of Congo red dye (CR) was evaluated based on the removal of Congo red (CR) in aqueous solution under visible light irradiation. The photocatalytic activity was affected by the structural and optical properties as well as the surface area of the samples. Compared with pure nanocomposites, the MnFe2O4@ZnO-GO nanocomposite compare to ZnFe2O4@MnO-GO nanocomposite displayed a high photocatalytic activity on the photodegradation of Congo red. The prepared graphene oxide nanocomposite can be potentially applied as a visible-light responsive catalyst and magnetically separable photocatalyst.