A thermally stable mesoporous ZrO₂-CeO₂-TiO₂ visible light photocatalyst

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• 作者：Minghui Li ; Shujuan Zhang ; Lu Lv ; Mengshu Wang ; Weiming Zhang ; Bingcai Pan
• 关键词：Thermal stability ; Mesoporous ; Titania ; Mechanism ; Photocatalysis
• 刊名：Chemical Engineering Journal
• 出版年：2013
• 出版时间：1 August, 2013
• 年：2013
• 卷：229
• 期：Complete
• 页码：118-125
• 全文大小：1379 K

文摘

A thermally stable, ordered mesoporous visible light photocatalyst (Ce, Zr-codoped titania) was synthesized through an evaporation-induced self-assembly method. The crystalline phase and the meso-structural ordering of this photocatalyst were characterized through wide-angle and small-angle X-ray diffraction, transmission electron microscopy and nitrogen adsorption analyses. The introduction of cerium into TiO₂ extended the absorption spectrum of TiO₂ to the visible region. Compared with the neat TiO₂, the CeO₂-TiO₂ of random structure and the mesoporous CeO₂-TiO₂, the mesoporous ZrO₂-CeO₂-TiO₂ had a larger surface area and a better long-range order due to the enhanced thermal stability. As a result, the mesoporous ZrO₂-CeO₂-TiO₂, among the four photocatalysts, showed the highest photocatalytic activity to Rhodamine B upon visible light irradiation. The photocatalytic degradation pathways of Rhodamine B by the mesoporous ZrO₂-CeO₂-TiO₂ were proposed based on product analysis. The results demonstrate that the mesoporous ZrO₂-CeO₂-TiO₂ could be a useful visible light photocatalyst.