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首页> 外文期刊>Crystal growth & design >Supersized TiO2 Mesocrystals Prepared by a Successive Topotactic Transformation Reaction and with a High Photocatalytic Activity
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Supersized TiO2 Mesocrystals Prepared by a Successive Topotactic Transformation Reaction and with a High Photocatalytic Activity

机译：通过连续的拓扑转化反应和高光催化活性制备的固化TiO 2中间晶体

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摘要

TiO2 has been widely used in the fields of energy, the environment, and biology. Most of the research focuses on nanosized TiO2 materials because of their high specific area, especially in the field of wastewater treatment. However, there are also a few drawbacks for nanosized materials such as low crystallization degree, troublesome recycling, and possible biosafety concerns. All these may hinder the large-scale application of TiO2 as photocatalysts. In this work, a new successive topotactic transformation (from (NH4)(2)TiOF4 to NH4TiOF3 and then to TiO2) method was developed to prepare anatase TiO2 mesocrystals with a length of similar to 150 mu m and the shape of a long hexagonal prism. The method belongs to a top-down strategy. It is easy to control the overall shape and size of the final product. The anatase TiO2 mesocrystals have super sizes and are composed of a crystallographically ordered assembly of TiO2 nanocrystals with exposed {001} facets. The photocatalytic activity of our materials is close to that of P25 when used in suspension system and superior when immobilized onto glass substrates by a simple pressure-aided method.
机译：TiO2已广泛用于能源，环境和生物学领域。由于其高特定区域，大多数研究侧重于纳米型TiO2材料，特别是在废水处理领域。然而，纳米化材料也存在一些缺点，例如低结晶度，麻烦的回收和可能的生物安全问题。所有这些都可能阻碍TiO2作为光催化剂的大规模施加。在这项工作中，开发了一种新的连续拓扑转化（从（NH4）（2）TIOF3和NH 4 TIOF3和TiO 2）方法，以制备锐钛矿TiO2中间晶体，其长度与150μm和长六边形棱镜的形状类似。该方法属于自上而下的策略。易于控制最终产品的整体形状和大小。锐钛矿TiO 2中间晶体具有超级尺寸，并且由具有暴露的{001}小平面的TiO2纳米晶体的晶形上有序组件组成。当通过简单的压力辅助方法在悬浮系统中使用时，我们材料的光催化活性接近P25的光催化活性。

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  • 来源
    《Crystal growth & design》 |2019年第10期|共6页
  • 作者

    Lei Bingyu; Guo Yanna; Xie Huan; Chen Jin; Li Xiaofan; Wu Yaqiao; Zhou Lei;

  • 作者单位

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Biomed Engn Sch Life Sci &

    Technol Wuhan 430074 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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