Synthesis and catalytic activity of new Gd₂BiSbO₇ and Gd₂YSbO₇ nanocatalysts

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• 作者：Jingfei Luan ; Kun Ma ; Bingcai Pan ; Yongmei Li ; Xiaoshan Wu ; Zhigang Zou
• 关键词：Gd₂BiSbO₇ ; Gd₂YSbO₇ ; Structural property ; Photocatalytic degradation ; Visible light irradiation
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2010
• 出版时间：14 April 2010
• 年：2010
• 卷：321
• 期：1-2
• 页码：1-9
• 全文大小：1024 K

文摘

Gd₂BiSbO₇ and Gd₂YSbO₇ were prepared for the first time and the structural and photocatalytic properties of Gd₂BiSbO₇ and Gd₂YSbO₇ were investigated. The results showed that Gd₂BiSbO₇ and Gd₂YSbO₇ crystallized with the pyrochlore-type structure, cubic crystal system by space group Fd3m. The lattice parameters a for Gd₂BiSbO₇ and Gd₂YSbO₇ were 10.70352(7) and 10.65365(1) Å, respectively. The band gaps of Gd₂BiSbO₇ and Gd₂YSbO₇ were estimated to be 2.081 and 2.396 eV, respectively. The photocatalytic degradation of rhodamine B (RhB) over Gd₂BiSbO₇ and Gd₂YSbO₇ was investigated under visible light irradiation. The results showed that Gd₂YSbO₇ and Gd₂BiSbO₇ owned higher catalytic activity compared with Bi₂InTaO₇. Moreover, Gd₂YSbO₇ showed higher catalytic activity compared with Gd₂BiSbO₇ for RhB photocatalytic degradation. The photocatalytic RhB degradation followed the first-order reaction kinetics, the apparent first-order rate constant k being 0.01766, 0.01906 and 0.00318 min⁻¹ with Gd₂BiSbO₇, Gd₂YSbO₇ and Bi₂InTaO₇, respectively. Complete removal of RhB was realized after visible light irradiation for 230 and 240 min with Gd₂YSbO₇ and Gd₂BiSbO₇. The reduction of the total organic carbon and the evolution of CO₂ revealed complete removal of RhB during the photocatalytic process by Gd₂YSbO₇ and Gd₂BiSbO₇. The possible photocatalytic degradation pathway of RhB was revealed under visible light irradiation.