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Proceedings Paper

Ag/WO3-codoped TiO2 nanoparticles: relation between structure, sorption, and photocatalytic activity
Author(s): Jing Y. Xu; Chen Wen; Li M. Jia; Chang F. Xiao
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Paper Abstract

Nanostructured Ag/WO3-TiO2 particles responding to sunlight were synthesized by dissolving silver nitrate, sodium tungstate and tetrabutyl titanate precursors in a suitable solvent. The obtained powders were characterized by a series of analytical methods including X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, Zeta potential measurements and UV-vis diffuse reflectance spectra (UV-vis DRS) to demonstrate their physicochemical properties. The as-prepared Ag/WO3-TiO2 samples were evaluated for their photocatalytic activity towards the degradation of methylene blue (MB) under sunlight irradiations. Both silver (Ag) and tungsten (W) species were well dispersed over TiO2 surface with less than 6.0 mol % Ag and 3.0 mol % W to Ti element and contributed to a formation of crystalline WO3. XRD analysis particularly demonstrates the existence of mixed-phase TiO2 materials, to which the improvement in photocatalytic activity is attributed. Besides, the light absorption of doped samples is prominent red shifted relative to the pure TiO2 due to the synergetic effect among the components of Ag, WO3 and TiO2 in the codoped-TiO2. The particle size of the Ag/WO3-TiO2 powders was found to be a decrease which is accompanied with the increase of the surface area. The excellent stability and dispersity of the Ag/WO3-TiO2 powders in aqueous solution could be attributed to the enhanced Zeta potential. On the other hand, the adsorption performances of different samples were tested in the removal of two dyes from aqueous solution(congo red and methylene blue). The first-order adsorption equilibrium constants were determined and the results obtained were fitted by Langmuir monolayer formation. Thus, the Langmuir adsorption isotherm parameters were estimated from the experimental data.

Paper Details

Date Published: 20 October 2009
PDF: 7 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74935P (20 October 2009); doi: 10.1117/12.838335
Show Author Affiliations
Jing Y. Xu, Tianjin Polytechnic Univ. (China)
Chen Wen, Tianjin Polytechnic Univ. (China)
Li M. Jia, Tianjin Polytechnic Univ. (China)
Chang F. Xiao, Tianjin Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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