Synthesis and photocatalitic activities of NiFe2O4/nitrogen-doped graphene oxide composite

Hoang Do Thi Phuong, Thuy Nguyen Thi, Ha Nguyen Thi, Diep Tran Thi Hong, Minh Nguyen Ngoc, Anh Nguyen Hoang, Thuy Lo Thi Thanh, Thang Nguyen Van, Hoan Nguyen Thi Vuong

Abstract


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%.

Keywords


Ferrite; Graphene oxide; NiFe2O4/N-doped GO composites

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References


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DOI: https://doi.org/10.51316/jca.2020.029

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