Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (12): 2933-2938.doi: 10.3866/PKU.WHXB20112933

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Microwave-Assisted Hydrothermal Synthesis of Ag-Loaded Titania Nanotubes and Their Photocatalytic Performance

CHEN Shu-Hai1,2, XU Yao1, LÜ Bao-Liang1, WU Dong1   

  1. 1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2011-07-20 Revised:2011-09-29 Published:2011-11-25
  • Contact: XU Yao
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (10835008).

Abstract: Ag-loaded titania nanotubes were synthesized by a microwave-assisted hydrothermal method and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), and UV-visible (UV-Vis) diffuse reflectance spectroscopy. The titania nanotubes were found to be in the anatase phase after calcination. The length of the synthesized titania nanotubes was about 200 nm, the average outer diameter was 7-8 nm, the inner diameter was 5-6 nm and the specific surface area was found to be 371 m2·g-1. With Ag loading the silver atoms did not enter the lattices of the nanotubes but dispersed over the nanotube surface. Ag-loading had no effect on the nanostructure and the crystal phase of the TiO2 nanotubes. The Ag-loaded titania nanotubes showed obvious visible light absorption and enhanced visible photocatalytic performance. The photocatalytic activity was evaluated by the photodegradation of a Rhodamine B aqueous solution under visible light. Compared with Ag-loaded P25 and pure titania nanotubes the Ag-loaded titania nanotubes enhanced the photoactivity and reached the maximum activity at a Ag/Ti molar ratio of 0.5%.

Key words: Titania nanotube, Microwave synthesis, Silver loading, Visible photocatalysis


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