期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 313, 期 1-2, 页码 107-113出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2009.08.009
关键词
Mesoporous; TiO2 microspheres; Bimodal; Photocatalytic activity; Hydrothermal; Hydroxyl radicals
资金
- National Natural Science Foundation of China [50625208, 20773097, 20877061, 20803055]
- National Basic Research Program of China [2007CB613302, 2009CB939704]
Bimodal mesoporous TiO2 microspheres with high photocatalytic activity were prepared by a hydrothermal method using titanium sulfate as precursor in the presence of urea. The results indicate that all prepared samples show bimodal pore-size distributions in the mesoporous region: smaller intraaggregated pores with peak pore diameter of ca. 2 nm and larger inter-aggregated pores with peak pore diameter of ca. 12.5 nm. The molar ratio of urea to Ti(SO4)(2) (R-u) has an obvious influence on the morphology, microstructure and photocatalytic activity of TiO2. With increasing R-u, specific surface areas and porosity increase, contrarily, the crystallite size and relative anatase crystallinity decrease. The photocatalytic activity first increases with R-u. At R-u = 2.0, the photocatalytic activity reaches the highest and is obviously higher than that of Degussa P25. With further increasing R-u, the photocatalytic activity decreases. The formation rate of hydroxyl radicals during photocatalysis has a positive correlation with the photocatalytic activity. (C) 2009 Elsevier B.V. All rights reserved.
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