Author: Wu Daoxin Tong Haixia Chen Qiyuan Xia Changbin
Publisher: Taylor & Francis Ltd
ISSN: 1058-4587
Source: Integrated Ferroelectrics, Vol.127, Iss.1, 2011-01, pp. : 55-62
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Abstract
In this paper, V5+ doped nano rutile TiO2 doped with different concentration V5+ were prepared by low temperature hydrolysis using Tetrabutyl titanate(C16H36O4Ti) as raw material. Powders were characterized by XRD, PL, DRS, BET. The effects of the doping concentration of V5+ to the photocatalytic activity of nano rutile TiO2 was investigated using Fe3+ as electron acceptor and at pH = 2.0 under 365 nm UV irradiation. The relationship between the DRS, PL spectra and the photaocatalytic activity was also discussed. Results show that with appropriate concentration, V5+ dopes into nano rutile TiO2 lattice without causing change in nano rutile TiO2 crystal structure. Therefore, surface oxygen vacancies and the donor energy level near the bottom of the conduction band lead to easier departure of photoinduced electrons from holes to achieve stronger photocatalytic activity. The highest photocatalytic oxygen evolution and PL Spectra intensity were achieved with the O2 evolution speed of 160 umol·L−1·h−1 when the V5+ concentration was 1.0 mol%, which demonstrated certain relationship between photoluminescence performance affected by V5+ concentration and the photocatalytic activity. The photocatalytic oxidation activity also corresponds to the concentration of Fe3+.
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