Structural Property and Catalytic Activity of New In2YbSbO7 and Gd2YbSbO7 Nanocatalysts under Visible Light Irradiation

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• 作者：Jingfei Luan ; Shu Wang ; Kun Ma ; Yongmei Li ; Bingcai Pan
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：May 27, 2010
• 年：2010
• 卷：114
• 期：20
• 页码：9398-9407
• 全文大小：418K
• 年卷期：v.114,no.20(May 27, 2010)
• ISSN：1932-7455

文摘

In₂YbSbO₇ and Gd₂YbSbO₇ were prepared first, while the structural and photocatalytic properties of them were investigated. In₂YbSbO₇ and Gd₂YbSbO₇ were crystallized with pyrochlore-type structure, cubic crystal system by space group Fd3m. The lattice parameters a for In₂YbSbO₇ and Gd₂YbSbO₇ were 10.340277 and 10.639527 Å. The band gap energies of In₂YbSbO₇ and Gd₂YbSbO₇ were 2.361 and 2.469 eV. In₂YbSbO₇ and Gd₂YbSbO₇ could photodegrade rhodamine B under visible light irradiation and they owned higher catalytic activity compared with Bi₂InTaO₇. Furthermore, In₂YbSbO₇ showed higher catalytic activity compared with Gd₂YbSbO₇. The photocatalytic degradation of rhodamine B with In₂YbSbO₇, Gd₂YbSbO₇ and Bi₂InTaO₇ followed the first-order reaction kinetics, and the first-order rate constant was 0.02466, 0.01430, and 0.00329 min⁻¹. After visible light irradiation for 235 and 255 min with In₂YbSbO₇ and Gd₂YbSbO₇ as catalysts, complete removal and mineralization of rhodamine B was observed. The photocatalytic degradation pathway of rhodamine B was obtained in this experiment.