Magnetic Nanocomposite of Cobalt-Ferrite/Reduced Graphene-Oxide for Photocatalytic Degradation of Organic Pollutants

Document Type : publication of the dissertation

Authors

1 Department of Biomaterials, Science and Research Branch, Islamic Azad University, Tehran, Iran and Department of Materials Science and Engineering, Sharif University of Technology

2 Previous MSc Student of Department of Materials Science and Engineering, Sharif University of Technology

Abstract

One of the most common pollutants in the industrial and agricultural wastewaters is 4-nitrophenol, which causes severe damages to the environment and the body of the animals. This material has a high resistance to natural degradation. So its removal must be thought of. Usual removal ways are too slow and hence time-consuming. An active catalyst can help the discharge of this pollutant and other nitro-aromatic compounds. The process efficiency is higher with tiny-powder activators. But removing small particles from the reaction environment is challenging. In this study, two materials, cobalt ferrite, and cobalt ferrite-reduced graphene oxide, which due to their magnetic properties both can be removed from the reaction medium, were synthesized in nanometric scale and were used for methylene blue decolorizing and 4-nitrofenol removal tests. Methods of X-ray diffraction, Raman spectroscopy, and field emission scanning electron microscopy were used to characterize the samples. The results showed that the cobalt ferrite-reduced graphene oxide nanocomposite yields higher efficiency for methylene blue decoloring and 4-aminophenol removal than cobalt ferrite. The cobalt ferrite-reduced graphene oxide nanocomposite could convert the 4-nitrophenol contaminant under visible light totally to 4-aminophenol in three minutes and was easily eliminated from the test medium with a simple magnet.

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