Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (08): 1383-1386.doi: 10.3866/PKU.WHXB20080810

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Preparation and Photocatalytic Performance of Titania Nanotubes Loaded with Ag Nanoparticles

LI Hai-Long; LUO Wu-Lin; CHEN Tao; TIAN Wen-Yu; SUN Mao; LI Chun; ZHU Di; LIU Ran-Ran; ZHAO Yu-Liang; LIU Chun-Li   

  1. Beijing National Laboratory for Molecular Science, College of Chemistry &Molecular Engineering, Peking University, Beijing 100871, P. R. China; Laboratory for Bio-Environmental Health Sciences of NanoscaleMaterials and Nanosafety and Key Laboratory of Nuclear Analytical Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2008-03-14 Revised:2008-04-09 Published:2008-08-06
  • Contact: LIU Chun-Li

Abstract: Titania nanotubes (TNTs) were synthesized by hydrothermal treatment of rutile-phase TiO2 nanoparticles in 10 mol·L-1NaOHsolution at 110 ℃ for 24 h. The Ag loaded titania nanotubes (Ag/TNTs) were obtained by chemical deposition method with the TNTs suspending in the AgNO3 solution (pH=8) at 50 益. The characterizations of the as-synthesized samples were performed by TEM, EDS, XRD, XPS, and UV-Vis spectra. The photocatalytic performance of the Ag/TNTs was investigated by UV-light induced photocatalytic decomposition of methyl orange(MO). The results showed that the inner/outer diameters of TNTs were about 6/10 nm and the length was several hundred nanometers. Both the shape and the crystalline of the nanotubes were not changed after the modification. The zero oxidation state Ag quantumdots, about 4 nmin diameter, were well dispersed on the external surface of the nanotubes. Ag/TNTs exhibited enhanced absorption at the visible range in the UV-Vis spectra. The Ag nanoparticles were found to significantly enhance the photocatalytic activity of TiO2 nanotubes, and the catalyst system was demonstrated to be highly efficient for the UV-light induced photocatalytic decomposition of MO compared to both rutile-phase TiO2 nanoparticles and pure TNTs. After irradiation for 60 min, the decomposition rates of MO solution in rutile-phase TiO2 nanoparticles, TNTs, and Ag/TNTs systemwere 46.8%, 57.2%, and 92.2%, respectively.

Key words: Nanotubes, Titania, Ag, Hydrothermal method, Photocatalysis


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