Composition dependence of the photophysical and photocatalytic properties of (AgNbO₃)_1−x(NaNbO₃)_x solid solutions

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• 作者：Guoqiang Li ; Tetsuya Kako ; Defa Wang ; Zhigang Zou ; Jinhua Ye
• 关键词：AgNbO₃ ; NaNbO₃ ; Solid solution ; Visible-light-sensitive photocatalyst
• 刊名：Journal of Solid State Chemistry
• 出版年：2007
• 出版时间：October 2007
• 年：2007
• 卷：180
• 期：10
• 页码：2845-2850
• 全文大小：365 K

文摘

A series of orthorhombic photocatalysts (AgNbO₃)_1−x(NaNbO₃)_x solid solutions have been synthesized by a solid-state reaction method. The composition dependence of the photophysical and photocatalytic properties of synthesized solid solutions has been investigated systematically. With an increase in the content of NaNbO₃, we found that (1) the lattice parameters decreased; (2) the Nb–O bond length in NbO₆ octahedron reduced; (3) the band gap increased; and (4) the mean particle size decreased while the Brunauer–Emmett–Teller (BET) surface area increased. Photocatalytic activities of the (AgNbO₃)_1−x(NaNbO₃)_x (0x0.5) samples were evaluated from gaseous 2-propanol (IPA) decomposition into acetone and CO₂ under visible-light irradiation emitted from blue-light-emitting diodes (BLEDs; light intensity: 0.01 mW cm⁻²). Among all the samples, the (AgNbO₃)_0.6(NaNbO₃)_0.4 sample showed the highest photocatalytic activity.