Nanocrystalline Fe/TiO2 Visible Photocatalyst with a Mesoporous Structure Prepared via a Nonhydrolytic Sol-Gel Route

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• 作者：Jian Zhu ; Jie Ren ; Yuning Huo ; Zhenfeng Bian ; Hexing Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 27, 2007
• 年：2007
• 卷：111
• 期：51
• 页码：18965 - 18969
• 全文大小：218K
• 年卷期：v.111,no.51(December 27, 2007)
• ISSN：1932-7455

文摘

Fe-doped nanocrystalline TiO₂ (Fe/TiO₂) with a mesoporous structure was prepared via a facile nonhydrolyticsol-gel (NSG) route. During photodegradation of methylene blue under visible light irradiation, as-preparedFe/TiO₂ exhibited a higher activity than either the undoped TiO₂ or the Fe/TiO₂ obtained via the traditionalhydrolytic sol-gel route. The correlation of the photocatalytic performance to the structural characteristics isdiscussed based on detailed characterizations. The promoting effect of the Fe-doping on the photocatalyticactivity could be attributed to the formation of intermediate energy levels that allow Fe/TiO₂ to be activatedeasily in the visible area. The optimum Fe-content in Fe/TiO₂ is determined as 0.1% (Fe/Ti molar ratio). Thenonhydrolytic sol-gel method is superior to the traditional hydrolytic sol-gel method owing to the controllablereaction rate and lack of surface tension, which ensures the formation of mesopores and well-crystallizedanatase in the Fe/TiO₂ sample, leading to a higher activity since the reactant molecules are easily adsorbedand the recombination between the photoelectrons and the holes is effectively inhibited. Meanwhile, thenonhydrolytic sol-gel process could strengthen the incorporation of Fe-dopants in the TiO₂ network, whichmay further enhance the promoting effect of Fe-doping on the photocatalytic activity.