Citation: SHANG Yang, CHEN Yang, SHI Zhan-Bin, ZHANG Dong-Feng, GUO Lin. Synthesis and Visible Light Photocatalytic Activities of Au/Cu₂O Heterogeneous Nanospheres[J]. Acta Physico-Chimica Sinica, ;2013, 29(08): 1819-1826. doi: 10.3866/PKU.WHXB201305281 shu

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

1.
School of Chemistry and Environment, Beihang University, Beijing 100191, P. R. China

Received Date: 6 February 2013
Available Online: 28 May 2013
Fund Project: 国家重点基础研究发展规划项目(973) (2010CB934700) (973) (2010CB934700) 国家自然科学基金(21173015) (21173015) 中央高校基本科研基金(YWF-11-03-Q-085) (YWF-11-03-Q-085)

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.
- Photocatalyst,
- Electron and hole separation,
- Cuprous oxide,
- ld,
- Heterojunction
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Synthesis and Visible Light Photocatalytic Activities of Au/Cu₂O Heterogeneous Nanospheres