期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 25, 期 12, 页码 2460-2468出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60318-0
关键词
photocatalysis; TiO2; anatase nanoparticles; rutile nanoflowers; simulated solar light illumination
资金
- National Natural Science Foundation of China [20977086, 21076196, 21177115]
- Science and Technology Project of Zhejiang Province, China [2012C23026, 2011C31041]
A series of TiO2 with different crystal phases and morphologies was synthesized via a facile hydrothermal process using titanium n-butoxide and concentrated hydrochloric acid as raw materials. The photocatalytic activity of the samples was evaluated by degradation of Methyl Orange in aqueous solution under UV-Visible light irradiation. On the basis of detailed analysis of the characterizing results of high-resolution transmission electron microscopy, X-ray powder diffraction measurements, X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller measurement, it was concluded that the photo-activity of the catalyst is related directly to the 3D morphology and the crystal phase composition. An excellent catalyst should have both a rutile 3D flower-like structure and anatase granulous particles. The 3D flower-like structure could enhance light harvesting, as well as the transfer of reactant molecules from bulk solution to the reactive sites on TiO2. In addition, the optimum anatase/rutile phase ratio was found to be 80:20, which is beneficial to the effective separation of the photogenerated electron-hole pairs.
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