Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (6): 1320-1328.doi: 10.7503/cjcu20200007

• Physical Chemistry • Previous Articles     Next Articles

Effects of Hydrothermal Reaction Conditions on the Structure and Properties of Porous Spherical Bi2WO6 Photocatalyst

WANG Rui1,XU Mei1,XIE Jiawen1,YE Shengying1,SONG Xianliang1,2,*()   

  1. 1. College of Food Science, South China Agriculture University, Guangzhou 510642, China
    2. Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou 510642, China
  • Received:2020-01-07 Online:2020-06-10 Published:2020-03-19
  • Contact: Xianliang SONG E-mail:songxl2000@163.com
  • Supported by:
    † Natural Science Foundation of Guangdong Province, China(2019A1515011977);National Natural Science Foundation of China(31371855)

Abstract:

Bi2WO6 photocatalysts were prepared via hydrothermal method. The effects of hydrothermal reaction temperature, hydrothermal time and pH value of precursor solution on the catalytic activity of the catalysts for ethylene degradation under visible-light irradiation were investigated. The crystal composition, micro-morphology and optical properties were characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), UV-Visible diffuse reflectance spectroscopy(UV-Vis DRS) and BET surface area analysis. The results show that at the conditions of 120 ℃, 12 h, pH=0.5, the Bi2WO6 photocatalyst undergoes anisotropic growth and Ostwald ripening process to form a porous microsphere structure self-assembled by two-dimensional nanosheets, which effectively increases the contact area with ethylene gas. The band gap width of the catalyst is reduced to 2.86 eV, and the visible light response range is widened. The degradation rate of ethylene reached 13.69% with in 240 min under visible light irradiation.

Key words: Porous microsphere, Bi2WO6, Visible-light photocatalysis, Ethylene degradation

CLC Number: