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Synthesis of magnetic CoFe2O4/g-C3N4 composite and its enhancement of photocatalytic ability under visible-light

Huang, Shuquan, Xu, Yuanguo, Xie, Meng, Xu, Hui, He, Minqiang, Xia, Jiexiang, Huang, Liying, Li, Huaming
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 v.478 pp. 71-80
X-ray diffraction, X-ray photoelectron spectroscopy, ambient temperature, carbon nitride, hydrogen peroxide, irradiation, magnetic fields, magnetic properties, methylene blue, photocatalysis, synergism, transmission electron microscopy
A magnetic photocatalytic CoFe2O4/g-C3N4 composite was successfully synthesized by a simple calcination method. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared (IR) spectra, UV–Vis diffuse reflection spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) were applied to characterize the as-prepared samples. The magnetic properties of CoFe2O4 and CoFe2O4/g-C3N4 composites were measured by using a vibrating sample magnetometer (VSM) at room temperature. Photocatalytic property of the CoFe2O4/g-C3N4 composite was assessed by degrading methylene blue (MB) in aqueous medium under visible light irradiation. The results showed that the composite of 41.4% CoFe2O4/g-C3N4 exhibited the highest photocatalytic activity. It could activate H2O2 to degrade MB up to 97.3% in 3h under the visible light irradiation. This enhancement could be attributed to the synergistic effect between CoFe2O4 and g-C3N4, which could enhance their activity of activating H2O2 to degrade MB under visible light. The CoFe2O4/g-C3N4 composites also have a strong magnetic ability. After the photocatalytic reaction, it can be quickly separated from the water by an extra magnetic field. Moreover, a possible photocatalytic mechanism was proposed.