One-pot Hydrothermal Synthesis of Bi_2O_3/BiVO_4 Composites with Highly Efficient Visible-light Photocatalytic Activity

摘要

Porous peanut-like Bi_2O_3/BiVO_4 composites with different Bi/V molar ratios have been synthesized by a one-pot hydrothermal synthesis method. The samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), UV-vis diffuse reflectance spectra (DRS), Fourier-transform infrared spectra (FTIR) and photoluminescence spectra (PL). Either monoclinic BiVO_4 or monoclinic Bi_2O_3 phase without other impurities was detected in the as-synthesized composite samples. DRS showed that Bi_2O_3/BiVO_4 composites exhibited stronger absorption in the visible range with a steep absorption edge compared with the pure BiVO_4. The PL intensity of the Bi_2O_3/BiVO_4 composites were lower than that of pure BiVO_4. Photocatalytic degradation of Methyle Orange (MO) showed the sample of Bi_2O_3/BiVO_4 composite with Bi:V molar ratio of 1.6:1 exhibited the highest photocatalytic activity and good stability.