Structural, photophysical and photocatalytic properties of novel Bi₂AlVO₇

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• 作者：Jingfei Luan ; Wei Zhao ; Jingwei Feng ; Hongling Cai ; Zheng Zheng ; Bingcai Pan ; Xiaoshan Wu ; Zhigang Zou ; Yongmei Li
• 关键词：Photocatalyst ; Bi₂AlVO₇ ; Structural characterization ; Photocatalytic degradation ; Visible light irradiation
• 刊名：Journal of Hazardous Materials
• 出版年：2009
• 出版时间：30 May 2009
• 年：2009
• 卷：164
• 期：2-3
• 页码：781-789
• 全文大小：1027 K

文摘

Bi₂AlVO₇ was prepared by solid-state reaction technique for the first time and the structural and photocatalytic properties of Bi₂AlVO₇ and Bi₂InTaO₇ were investigated. The results showed that Bi₂AlVO₇ crystallized in the tetragonal crystal system with space group I4/mmm. In addition, the band gaps of Bi₂AlVO₇ and Bi₂InTaO₇ were estimated to be about 2.06 and 2.81 eV. The photocatalytic degradation of aqueous methylene blue (MB) dye with Bi₂AlVO₇ or Bi₂InTaO₇ as catalyst was investigated under visible light irradiation. Bi₂AlVO₇ showed higher photocatalytic activity compared with Bi₂InTaO₇ for photocatalytic degradation of MB under visible light irradiation. Complete removal of aqueous MB dye was realized after visible light irradiation for 160 min with Bi₂AlVO₇ as the photocatalyst. The reduction of the total organic carbon (TOC) and the formation of inorganic products, SO₄²⁻ and NO₃⁻ revealed the continuous mineralization of aqueous MB dye during the photocatalytic process. The possible photocatalytic degradation pathway of aqueous MB dye was revealed under visible light irradiation.