Photocatalytic activity of single and mixed nanosheet-like Bi₂WO₆ and TiO₂ for Rhodamine B degradation under sunlike and visible illumination

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• 作者：S. Murcia-Ló ; pez ; ^{sebastian.murcia@icmse.csic.es} ; M.C. Hidalgo ; J.A. Naví ; o ^navio@us.es
• 关键词：Photocatalysis ; Bi2WO6 ; TiO2 ; Rhodamine B ; Sunlike illumination
• 刊名：Applied Catalysis A ; General
• 出版年：2012
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：7 May, 2012
• 卷：423-424
• 期：Complete
• 页码：34-41
• 文件大小：1622 K

摘要

The photocatalytic activity, under sunlike illumination, for Rhodamine B (RhB) degradation using Bi₂WO₆-TiO₂ samples, is reported. Two different kinds of Bi₂WO₆-TiO₂ samples were studied, obtained by distinct methods: first, a mechanical mixing, by adding to synthesized nanosheet-like Bi₂WO₆ powder the corresponding amount of TiO₂ nanoparticles (P25) in order to obtain physical mixtures of both catalysts with different percentages of TiO₂ (5, 10 and 50 wt%); second, a single Bi₂WO₆-TiO₂ heterostructure was prepared by adding commercial TiO₂-P25 to the Bi₂WO₆ precursors (50 wt%) prior to the hydrothermal treatment, thus obtaining a sample with 鈥渋n situ鈥?TiO₂ incorporation. Comparisons between the photocatalytic behaviour of these samples and those exhibited by the single materials Bi₂WO₆ and TiO₂ (P25) were carried out, in order to establish the effect not only of the TiO₂ addition but also of the way in which TiO₂ (P25) is incorporated. The role of each single photocatalyst in the mixtures in the RhB degradation and mineralization under sunlike and just visible illumination was also studied.