3 years ago

Co–Pd/BiVO4: High-performance photocatalysts for the degradation of phenol under visible light irradiation

Co–Pd/BiVO4: High-performance photocatalysts for the degradation of phenol under visible light irradiation
Leaf-like monoclinic BiVO4 and yCo x Pd/BiVO4 (Co x Pd loading (y)=0.0600.092wt%; Co/Pd molar ratio (x)=0.261.70) photocatalysts were prepared using the hydrothermal and polyvinyl alcohol-protected reduction methods, respectively. The Co−Pd nanoparticles (NPs) with a size of 4–6nm were well dispersed on the surface of leaf-like BiVO4. The bimetallic Co−Pd-loaded BiVO4 samples performed much better than the monometallic Co- or Pd-loaded counterpart, with the 0.062Co1.70Pd/BiVO4 sample showing the best photocatalytic performance (the time for 90% phenol removal was 3h under visible light irradiation) and good photocatalytic stability. The pseudo-first-order reaction rate constants (0.47530.8367h−1) obtained over yCo x Pd/BiVO4 were much higher than those (0.06190.3788h−1) obtained over BiVO4, 0.058Co/BiVO4, and 0.083Pd/BiVO4, with the 0.062Co1.70Pd/BiVO4 sample possessing the highest rate constant. In-depth investigations of X-ray photoelectron spectroscopy, photoluminescence spectroscopy, and photoelectrochemical measurements reveal that high dispersion of bimetallic Co–Pd NPs increased the surface Pd0 and superoxide anion radical concentrations and suppressed the recombination of photoinduced electrons and holes (hence enhancing the photocatalytic activity of yCo x Pd/BiVO4). The partial deactivation of the 0.062Co1.70Pd/BiVO4 sample after 15h of three recycle tests was mainly due to the decrease in adsorbed oxygen species concentration. In addition, the possible photocatalytic phenol degradation mechanism over the 0.062Co1.70Pd/BiVO4 sample was also proposed. We believe that the BiVO4-supported Co–Pd NPs have promising applications for the photocatalytic elimination of organic pollutants in wastewater.

Publisher URL: www.sciencedirect.com/science

DOI: S0926337317310184

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