【摘 要】
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Gd2O3 nanoparticles modified g-C3N4 photocatalytic composites were synthesized by a simple one-step hydrothermal method.The structure,morphology,optical properties of the prepared photocatalyst were characterized by X-ray diffraction (XRD),field emission
【机 构】
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School of New Energy Science and Engineering,Xinyu University,Xinyu 338004,China;College of Environm
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Gd2O3 nanoparticles modified g-C3N4 photocatalytic composites were synthesized by a simple one-step hydrothermal method.The structure,morphology,optical properties of the prepared photocatalyst were characterized by X-ray diffraction (XRD),field emission scanning electron microscopy (FESEM),field emission transmission electron microscopy (FETEM) and X-ray photoelectron spectroscopy (XPS).The result demonstrates that gadolinium is mainly dispersed on the surface of g-C3N4 in the form of Gd2O3,and does not destroy the lattice structure ofg-C3N4.Besides,the gadolinium can cause the red shift of the absorption edge of light,narrow the band gap,and increase the separation efficiency of the photo-generated electron and hole of g-C3N4.Especially,the specific surface area of g-C3N4 can be significantly increased.Furthermore,g-C3N4/Gd-0.05 displays the highest photodegradation performance when it is used for degradation of methyl orange (MO),methylene blue (MB) and Rhodamine B (RhB).The pho-todegradation rate of g-C3N4/Gd-0.05 composites is 72.4％ for MO,95.5％ for RhB,100％ for MB after 120 min under visible light (λ ＞ 420 nm) irradiation.Narrow band gap promotes the separation of photogenerated electron and hole,which enhances the photocatalytic activity of g-C3N4.It is noted that g-C3N4/Gd-0.05 exhibits excellent photocatalytic stability by the photocurrent and the cyclic photo-degradation of MO.
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