期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 354, 期 1, 页码 175-180出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.10.048
关键词
C-TiO2; Nanoparticle; Anatase; Photocatalysis; Photovoltage
资金
- National Basic Research Program of China (973 Program) [2007CB613303]
- National Natural Science Foundation of China [20703020, 20873053]
Carbon-doped anatase TiO2 was prepared by a facile hydrothermal process without adding additional carbon source. The as-prepared sample shows highly efficient photocatalytic activity, which only requires 4 min and is about 11 times higher than that of Degussa P25 TiO2 in degradation of methyl orange (MO) dye under UV light irradiation. Moreover, a highly visible-light activity is also observed. UV-vis diffuse reflectance spectra and X-ray photoelectron spectroscopy confirm that the carbon atoms are incorporated into the interstitial positions of TiO2 lattice and form a strong interaction with titanium atoms and extend photoresponding range to 700 nm. Surface photovoltage spectra (SPS) and transient photovoltage (TPV) suggest that the presence of interstitial carbons induce several localized occupied states in the gap, enhance the separation extent and restrain the recombination of the photo-induced electron and hole carriers in TiO2. (C) 2010 Elsevier Inc. All rights reserved.
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