An Efficient Visible-Light-Sensitive Fe(III)-Grafted TiO2 Photocatalyst

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• 作者：Huogen Yu ; Hiroshi Irie ; Yoshiki Shimodaira ; Yasuhiro Hosogi ; Yasushi Kuroda ; Masahiro Miyauchi ; Kazuhito Hashimoto
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：October 7, 2010
• 年：2010
• 卷：114
• 期：39
• 页码：16481-16487
• 全文大小：233K
• 年卷期：v.114,no.39(October 7, 2010)
• ISSN：1932-7455

文摘

We have prepared a TiO₂-based novel visible-light-sensitive photocatalyst, in which Fe(III) species were grafted on a rutile TiO₂ surface (denoted as Fe(III)/TiO₂). With use of X-ray absorption fine structure analysis, the grafted iron species were determined to be in the 3+ state and adopt an amorphous FeO(OH)-like structure. Fe(III)/TiO₂ displayed optical absorption in the visible light range over 400 nm, which was assigned to the interfacial charge transfer from the valence band of TiO₂ to the surface Fe(III) species. Its photocatalytic activity was evaluated by the decomposition of gaseous 2-propanol under visible light (400−530 nm), which revealed a high quantum efficiency (QE) of 22%. Monochromatic light experiments indicated that the effective wavelength region was extended as far as 580 nm while maintaining a QE of greater than 10%. On the basis of the analogy to Cu(II)-grafted TiO₂ photocatalyst (Irie, H.; et al. Chem. Phys. Lett. 2008, 457, 202), we speculate that the high performance of the present photocatalyst is derived from the photoproduced holes that are generated in the valence band of TiO₂ and contribute to the oxidative decomposition of 2-propanol, and the catalytic reduction of oxygen (presumably multielectron reduction) by photoproduced Fe(II) species on TiO₂.