Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (12): 1982-1987.DOI: 10.3724/SP.J.1088.2012.20901

• Research papers • Previous Articles    

Polyacrylamide Gel Preparation, Photocatalytic Properties, and Mechanism of BiVO4 Particles

SUN Junhui2, YANG Hua1,2,*, XIAN Tao1,2, WANG Weipeng2, FENG Wangjun2   

  1. 1State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2School of Science, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
  • Received:2012-09-05 Revised:2012-10-22 Online:2013-01-18 Published:2012-12-18

Abstract: BiVO4 particles were prepared by a polyacrylamide gel method and characterized by X-ray diffraction, scanning electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The results demonstrate that the as-prepared BiVO4 particles crystallize in a monoclinic scheelite-type structure, are regularly shaped like spheres with a uniform size of ~400 nm, and have a bandgap energy of 2.49 eV. The photocatalytic activity of BiVO4 particles was evaluated by the degradation of methylene blue under simulated sunlight irradiation. The effects of O2, N2, ethanol, and KI on the photocatalytic efficiency were investigated. Hydroxyl radicals (•OH) formed on the catalyst under simulated sunlight irradiation were detected by photoluminescence spectroscopy using terephthalic acid as a probe molecule. The photocatalytic degradation mechanism involved is discussed in detail. Based on the photocatalytic results, hydroxyl radicals and photogenerated h+ are suggested to be the two main active species toward the photocatalytic degradation of methylene blue by BiVO4.

Key words: bismuth vanadate, nanoparticle, polyacrylamide gel method, photocatalytic mechanism, hole, hydroxyl radical