1School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
2School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
3School Of Metallurgy and Materials Eng., College of Eng., University of Tehran
In the present research, bismuth ferrite-graphene oxide nanocomposite has been studied as a photocatalytic material for the removal of water pollution. Multiferroic BiFeO3 (BFO) powders were synthesized by a facile and cost-effective sol-gel method using bismuth nitrate and iron nitrate. Graphene oxide (GO) was sonicated and added to the BFO sol (1 wt.%), then the dried BFO-GO gel was annealed at 600 °C in an argon environment. The structure and morphology of the BFO-GO nanocomposite are characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Also, the band gap and optical properties are explored by diffuse reflectance spectroscopy (DRS). XRD results show the BFO-GO nanocomposite has a perovskite structure and is mainly composed of a rhombohedral BiFeO3 phase (R-phase) with a minor impurity phase of Bi25FeO40 and Bi2Fe4O9. FESEM depicts that the BFO nanoparticles are homogenously grafted on and around the GO sheets. The band gap of the BFO-GO nanocomposite is around 1.8 eV. The photocatalytic characteristic of the BFO-GO is investigated by photocatalytic degradation of methylene blue (MB) aqueous solution under visible light. The degradation efficiency of 70% after 300 min visible light irradiation is obtained. The BFO-GO nanocomposite powder exhibits significant photocatalytic behavior because the structural, morphological, and optical properties of BFO are greatly modified and enhanced by adding GO.