Synthesis and Visible-Light-Driven Photocatalytic Properties of Floating BiFeO3/Expanding Perlite Photocatalysts
A series of floating photocatalysts containing BiFeO3 nanoparticles on the expanding perlite(EP)support were synthesized by hydrothermal method.The as-prepared composites were characterized by X-ray diffraction(XRD),Fourier transform infrared spectrometer(FT-IR),scanning electron microscope(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectra(XPS)and UV-Vis diffusion reflection(UV-Vis DRS).The SEM and TEM analyses indicated that BiFeO3 was dispersed on the surface of EP.The DRS spectra revealed that the compos-ites had improved optical adsorption in the visible light region,and exhibited enhanced photocatalytic activity for methylene blue(MB)degradation under visible light irradiation.It was found that the 70％BiFeO3/EP composite showed the highest photocatalytic activity for MB dye wastewater treatment,and the first-order rate constant for 70％BiFeO3/EP was 2.2 times higher than that for pure BiFeO3.Owing to the low density of EP,the as-prepared BiFeO3/EP particles floated in water to favor phase separation and the recovery of the photocatalyst after the reac-tion.The recovery test shows that the composite was rather stable during the MB photodegradation.
NETL
NSTL
万方数据
