Visible Light Photocatalyst: Iodine-Doped Mesoporous Titania with a Bicrystalline Framework

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• 作者：Gang Liu ; Zhigang Chen ; Chunlei Dong ; Yanning Zhao ; Feng Li ; Gao Qing Lu ; Hui-Ming Cheng
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：October 26, 2006
• 年：2006
• 卷：110
• 期：42
• 页码：20823 - 20828
• 全文大小：197K
• 年卷期：v.110,no.42(October 26, 2006)
• ISSN：1520-5207

文摘

Iodine-doped (I-doped) mesoporous titania with a bicrystalline (anatase and rutile) framework was synthesizedby a two-step template hydrothermal synthesis route. I-doped titania with anatase structure was also synthesizedwithout the use of a block copolymer as a template. The resultant titania samples were characterized byX-ray diffraction, Raman spectroscopy, Fourier transform infrared, nitrogen adsorption, transmission electronmicroscopy, X-ray photoelectron spectroscopy, and UV-visible absorption spectroscopy. Both I-doped titaniasamples, with and without template, show much better photocatalytic activity than commercial P25 titania inthe photodegradation of methylene blue under the irradiation of visible light (>420 nm) and UV-visiblelight. Furthermore, I-doped mesoporous titania with a bicrystalline framework exhibits better activity thanI-doped titania with anatase structure. The effect of rutile phase in titania on the adsorptive capacity of waterand surface hydroxyl, and photocatalytic activity was investigated in detail. The excellent performance ofI-doped mesoporous titania under both visible light and UV-visible light can be attributed to the combinedeffects of bicrystalline framework, high crystallinity, large surface area, mesoporous structure, and high visiblelight absorption induced by I-doping.