Document Type : publication of the dissertation
Department of Biomaterials, Science and Research Branch, Islamic Azad University, Tehran, Iran and Department of Materials Science and Engineering, Sharif University of Technology
Previous MSc Student of Department of Materials Science and Engineering, Sharif University of Technology
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.