Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (08): 1819-1826.doi: 10.3866/PKU.WHXB201305281

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Synthesis and Visible Light Photocatalytic Activities of Au/Cu2O Heterogeneous Nanospheres

SHANG Yang, CHEN Yang, SHI Zhan-Bin, ZHANG Dong-Feng, GUO Lin   

  1. School of Chemistry and Environment, Beihang University, Beijing 100191, P. R. China
  • Received:2013-02-06 Revised:2013-05-28 Published:2013-07-09
  • Contact: ZHANG Dong-Feng, GUO Lin E-mail:dfzhang@buaa.edu.cn;guolin@buaa.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2010CB934700), National Natural Science Foundation of China (21173015), Fundamental Research Funds for the Central Universities, China (YWF-11-03-Q-085), and Innovation of BUAA for PhD Graduates, China.

Abstract:

Au/Cu2O heterogeneous spheres (HGS) were prepared by in situ reduction of preadsorbed AuCl4- on the surface of Cu2O mesoporous spheres (MPS) linked by L-cysteine. The resulting products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), and N2 physical adsorption. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methylene blue (MB) under visible light (λ>400 nm) irradiation. The experimental results revealed that the Cu2O MPS kept their mesoporous structure after loading with Au, and small Au nanoparticles (NPs) with a diameter of ~4 nm were identified on the surface of the MPSs. N2 physical adsorption analysis showed that the pore size distributions of Cu2O MPSs were unchanged after loading with Au NPs. Using ethanol as a solvent retarded the redox reaction between AuCl4- and Cu2O, avoiding damage to the mesoporous structures. The Au/Cu2O HGSs exhibited higher visible-light photocatalytic activity for the degradation of methylene blue than the pure Cu2O MPSs. The enhanced photocatalytic efficiency of the Au/Cu2O HGSs was attributed to rapid charge transfer from Cu2O to the loaded Au NPs as well as the surface plasmon resonance of Au NPs.

Key words: Photocatalyst, Electron and hole separation, Cuprous oxide, Gold, Heterojunction

MSC2000: 

  • O643