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首页> 外文期刊>Crystal growth & design >Mesocrystalline Nanocomposites of TiO2 Polymorphs: Topochemical Mesocrystal Conversion, Characterization, and Photocatalytic Response
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Mesocrystalline Nanocomposites of TiO2 Polymorphs: Topochemical Mesocrystal Conversion, Characterization, and Photocatalytic Response

机译：TiO2多晶型的介晶纳米复合材料：拓扑化学介晶转换，表征和光催化反应。

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摘要

Four kinds of platelike mesocrystalline nanocomposites of TiO2 polymorphs were successfully synthesized for the first time based on a topochemical mesocrystal conversion mechanism. In this conversion process, a [010]-oriented titanate H-1.07 square Ti-1.73 square O-0.27(4) (square: vacancy of Ti) single crystal with lepidocrocite-like structure and platelike morphology was successively transformed into [001]- and [102]-oriented TiO2(B) phases including a {010}-faceted TiO2(B) twinning, [010]-oriented anatase phase, and [110]-oriented rutile phase. The platelike particle morphology is retained in the topochemical conversion process. The platelike particles are constructed from nanocrystals which well-aligned in the same orientation for the same phase, resulting in the formations of HTO/TiO2(B), HTO/TiO2(B)/anatase, TiO2(B)/anatase, and anatase/rutile mesocrystalline nanocomposites. The reaction mechanism and the crystallographic topological correspondences between the precursor, intermediates, and the final product were given on the basis of the nanostructural analysis results. The mesocrystalline nanocomposite of anatase/rutile polymorphs exhibits unexpectedly high surface photocatalytic activity, which can be explained by the superior electron-hole separation effect and the high activity of {010}-faceted anatase surface in the mesocrystalline nanocomposite. Such mesocrystalline anatase/rutile nanocomposite is an ideal photocatalytic system.
机译：基于拓扑化学介晶转化机理，首次成功合成了四种TiO2多晶型片状介晶纳米复合材料。在该转化过程中，依次将具有纤铁矿状结构和板状形态的[010]取向钛酸酯H-1.07方Ti-1.73方O-0.27（4）（方：Ti的空位）单晶转变为[001] -和[102]取向的TiO2（B）相，包括{010}面的TiO2（B）孪晶，[010]取向的锐钛矿相和[110]取向的金红石相。板状颗粒的形态保留在拓扑化学转化过程中。板状颗粒是由纳米晶体构成的，该纳米晶体在相同方向上针对同一相进行了很好的排列，从而形成了HTO / TiO2（B），HTO / TiO2（B）/锐钛矿，TiO2（B）/锐钛矿和锐钛矿金红石型中晶纳米复合材料。在纳米结构分析结果的基础上，给出了前驱体，中间体和最终产物之间的反应机理和晶体拓扑学对应关系。锐钛矿/金红石多晶型物的介晶纳米复合材料表现出出乎意料的高表面光催化活性，这可以由介晶纳米复合材料中优异的电子-空穴分离作用和{010}面锐钛矿表面的高活性来解释。这样的介晶锐钛矿/金红石纳米复合材料是理想的光催化系统。

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