Visible-Light-Sensitive Photocatalysts: Nanocluster-Grafted Titanium Dioxide for Indoor Environmental Remediation

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• 作者：Masahiro Miyauchi ; Hiroshi Irie ; Min Liu ; Xiaoqing Qiu ; Huogen Yu ; Kayano Sunada ; Kazuhito Hashimoto
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：January 7, 2016
• 年：2016
• 卷：7
• 期：1
• 页码：75-84
• 全文大小：544K
• ISSN：1948-7185

文摘

Photocatalytic degradation of organic compounds requires photoexcited holes with strong oxidative power in the valence band (VB) of semiconductors. Although numerous types of doped semiconductors, such as nitrogen-doped TiO₂, have been studied as visible-light-sensitive photocatalysts, the quantum yields of these materials were very low because of the limited oxidation power of holes in the nitrogen level above the VB. Recently, we developed visible-light-sensitive Cu(II) and Fe(III) nanocluster-grafted TiO₂ using a facile impregnation method and demonstrated that visible-light absorption occurs at the interface between the nanoclusters and TiO₂, as electrons in the VB of TiO₂ are excited to the nanoclusters under visible-light irradiation. In addition, photogenerated holes in the VB of TiO₂ efficiently oxidize organic contaminants, and the excited electrons that accumulate in nanoclusters facilitate the multielectron reduction of oxygen. Notably, Cu(II) and Fe(III) nanocluster-grafted TiO₂ photocatalyst has the highest quantum yield among reported photocatalysts and has antiviral, self-cleaning, and air purification properties under illumination by indoor light fixtures equipped with white fluorescent bulbs or white light-emitting diodes.