Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (04): 813-820.doi: 10.3866/PKU.WHXB201301151

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Significantly Improved Visible Light Photocatalytic Activity of γ-Bi2MoO6 by Surface Modification with Cu2O Nanoparticles

YANG Zi-Rong1, HAN Yu-Qi1, WANG Fang1, LIU Qian1, ZHANG Yang1, MIN Shi- Xiong1,2   

  1. 1 Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities , College of Chemistry and Chemical Engineering , Hexi University, Zhangye 734000 , Gansu Province, P. R. China;
    2 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
  • Received:2012-10-31 Revised:2013-01-14 Published:2013-03-25
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51263008), Principal Fund of Hexi University, China (XZ2010), University Science and Technology Innovation Project of Hexi University, China, and General Projects of Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, China (XZ1012).

Abstract:

Nanosized cuprous oxide (Cu2O) was used to modify the surface of γ-Bi2MoO6, resulting in highly efficient visible-light-responsive Cu2O/γ-Bi2MoO6 composite photocatalysts. The obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrum (UV-Vis-DRS) to determine their phase structures, micromorphologies, and light absorption properties. The important role of surface-modified Cu2O in improving the photocatalytic activity of γ-Bi2MoO6 under visible light irradiation was studied using the degradation of methylene blue (MB). The results showed that Cu2O nanoparticles with average size of ~10 nm modified the surface of the γ-Bi2MoO6. The nanoparticles delivered both an obvious red-shift of absorption threshold and intensity of the γ-Bi2MoO6, as well as enhanced separation efficiency of photogenerated carriers, thereby leading to significant enhancement in photocatalytic activity. When the amount of Cu2O was 1.5%, the photocatalytic activity of the Cu2O/γ-Bi2MoO6 composite photocatalyst was 6.4 times higher than that of pristine γ-Bi2MoO6.

Key words: Cu2O, γ-Bi2MoO6, Surface modification, Visible light, Methylene blue, Degradation

MSC2000: 

  • O643.36