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首页> 外文期刊>Chemistry: A European journal >Bismuth-doped ordered mesoporous TiO2: Visible-light catalyst for simultaneous degradation of phenol and chromium
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Bismuth-doped ordered mesoporous TiO2: Visible-light catalyst for simultaneous degradation of phenol and chromium

机译：铋掺杂有序介孔TiO2：可见光催化剂，可同时降解苯酚和铬

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摘要

A controllable and reproducible synthesis of highly ordered two-dimensional hexagonal mesoporous, crystalline bismuth-doped TiO_2 nanocomposites with variable Bi ratios is reported here. Analyses by transmission electron microscopy, X-ray diffraction, Raman, and X-ray photoelectron spectroscopy reveal that the well-ordered mesostructure is doped with Bi, which exists as Bi~(3+) and Bi~((3+x+)). The Bi-doped mesoporous TiO_2 (ms-TiO_2) samples exhibit improved photocatalytic activities for simultaneous phenol oxidation and chromium reduction in aqueous suspension under visible and UV light over the pure ms-TiO_2, P-25, and conventional Bi-doped titania. The high catalytic activity is due to both the unique structural characteristics and the Bi doping. This new material extends the spectral response from UV to the visible region, and reduces electron-hole recombination, which renders the 2.0 % Bi-doped ms-TiO_2 photocatalyst highly responsive to visible light. Bismuth cleans up: Highly ordered 2D hexagonal mesoporous (ms) crystalline Bi-doped TiO_2 nanocomposites that are active catalysts in the visible region have been synthesized (see figure). The photocatalytic activity of 2.0 % Bi-doped ms-TiO_2 is far superior to other TiO_2 catalysts for the simultaneous degradation of phenol and reduction of chromium under visible illumination.
机译：本文报道了具有可变Bi比的高度有序的二维六方六方介孔，结晶铋掺杂的TiO_2纳米复合材料的可控和可再现的合成。通过透射电子显微镜，X射线衍射，拉曼光谱和X射线光电子能谱分析发现，有序介孔结构掺杂有Bi，Bi以Bi〜（3+）和Bi〜（（3 + x +））的形式存在。 。在纯ms-TiO_2，P-25和常规的Bi-掺杂的二氧化钛上，Bi掺杂的中孔TiO_2（ms-TiO_2）样品在可见光和紫外光下在水悬浮液中同时苯酚氧化和铬还原的同时，显示出改善的光催化活性。高催化活性归因于独特的结构特征和Bi掺杂。这种新材料将紫外线的光谱响应扩展到可见光区域，并减少了电子-空穴复合，这使2.0％Bi掺杂的ms-TiO_2光催化剂对可见光具有更高的响应能力。铋清除：已经合成了在可见光区域是活性催化剂的高度有序的2D六角形介孔（ms）晶体Bi掺杂TiO_2纳米复合材料（见图）。 2.0％Bi掺杂的ms-TiO_2的光催化活性在可见光下能同时降解苯酚和还原铬，远远优于其他TiO_2催化剂。

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