In this work, the NiFe2O4/N-doped GO composites were successfully synthesized by the hydrothermal method. The structure, chemical compositions, the presence of functional groups, surface morphology, and magnetic properties of the obtained composites were investigated by X-ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDX), Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM). The experimental results show that nickel ferrite (NiFe2O4) nanoparticles with the size of about 9-20 nm are dispersed evenly on the GO surface denatured by nitrogen. The saturation magnetization of composite NiFe2O4/GO-N is 39,32 emu/g. Photocatalytic activities of the NiFe2O4/N-doped GO composites have been evaluated through the photodegradation of the methyl blue (MB) under the irradiation of a tungsten filament lamp 75 W - 220 V, using a UV filter. MB photodegradation efficiency reaches 98% after 240 minutes of illumination. The NiFe2O4/N-doped GO photocatalysts are recovered under the utilization of an external magnetic field and can be reused. After 3 times of reuse, MB photodegradation efficiency reaches over 87%.
In this study, the g-C3N4/CoFe2O4/Reduced graphene oxide composites were successfully synthesized by the co-precipitation method combined with mixed phase mixture. The obtained results from characterization methods such as XRD, SEM, FT-IR, EDX,… showed that the composite has a high structure and crystallinity, and spinel ferrite particles were dispersed fairly evenly onto reduced graphene oxide sheets as well as layers of g-C3N4. The existence of Co/Fe-O and Co-O-C bonds in materials was determined. The photocatalytic activity of g-C3N4/CoFe2O4/Reduced graphene oxide (GCN/CF-rGO) was estimated through the degradation of Tetracycline (TC) in aqueous solution. TC decomposition efficiency is up to 95% after 240 minutes of reaction and is higher than that of each component material. GCN/CF-rGO is a potential catalyst for effective application in TC decomposition reaction under visible light and has the ability to implement treatment in practice.
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