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首页> 外文期刊>Materials Chemistry and Physics >Low-temperature crystallization of TiO_2 nanotube arrays via hot water treatment and their photocatalytic properties under visible-light irradiation
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Low-temperature crystallization of TiO_2 nanotube arrays via hot water treatment and their photocatalytic properties under visible-light irradiation

机译：TiO_2纳米管阵列的热水低温结晶及其在可见光照射下的光催化性能

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摘要

This work demonstrates the facile method to crystallize TiO_2 nanotube arrays by simple immersion of amorphous TiO_2 nanotube arrays into hot water at ～70-90 ℃ under ambient pressure and neutral pH. Hot water treatment induced the transformation of smooth nanotubes walls to granular anatase TiO_2 nanoparticles. Higher treatment temperature and longer exposure time promoted the growth of anatase TiO_2 nanocrystallites, and also lowered number of oxygen vacancies (V_0~(**)). Furthermore, it allowed the adsorption of hydroxyl (OH) species and H_2O as well as the generation of the surface state, ca., Ti~(3+). The presence of interstitial carbon species and surface states enabled the visible-light absorption. The adsorbed OH species and H_2O stimulated the photocatalytic oxidation by instantaneous reaction at the surface of nanotubes. Anatase TiO_2 nanocrystallites formed by hot water treatment at 90 ℃ for 3 h exhibited efficient photocatalytic removal of dyes under visible-light irradiation with the decomposition rate of ～11% h~(-1), which is relatively higher than that of heat-treated arrays (～9% h~(-1)). The results indicate the potential of hot water treatment for the formation of anatase TiO2 nanocrystallites with efficient photocatalytic properties.
机译：这项工作展示了一种简单的方法，可以在环境压力和中性pH下，将非晶态TiO_2纳米管阵列简单地浸入约70-90℃的热水中，从而使TiO_2纳米管阵列结晶。热水处理引起光滑的纳米管壁向锐钛矿型TiO_2纳米颗粒的转化。较高的处理温度和较长的暴露时间促进了锐钛矿型TiO_2纳米晶体的生长，并降低了氧空位（V_0〜（**））的数量。此外，它还允许羟基（OH）和H_2O的吸附以及表面态Ti〜（3+）的生成。间隙碳物种和表面状态的存在使得可见光吸收。吸附的OH和H_2O通过纳米管表面的瞬时反应促进了光催化氧化。 90℃热水处理3 h​​形成的锐钛矿型TiO_2纳米微晶在可见光照射下具有高效的光催化去除染料的性能，其分解率约为11％h〜（-1），高于热处理后的分解率。阵列（〜9％h〜（-1））。结果表明，热水处理具有形成具有高效光催化性能的锐钛矿型TiO2纳米晶体的潜力。

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  • 来源
    《Materials Chemistry and Physics》 |2013年第3期|991-998|共8页
  • 作者

    Warapong Krengvirat; Srimala Sreekantan; Ahmad-Fauzi Mohd Noor; Nobuaki Negishi; Go Kawamura; Hiroyuki Muto; Atsunori Matsuda;

  • 作者单位

    School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Penang 14300, Malaysia,Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Aichi 441-8580, Japan;

    School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Penang 14300, Malaysia;

    School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Penang 14300, Malaysia;

    Institute for Environmental Management Technology, National Institute of Advanced, Industrial Science and Technology, Tsukuba, Ibaraki 305-8569, Japan;

    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Aichi 441-8580, Japan;

    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Aichi 441-8580, Japan;

    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Aichi 441-8580, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanostructures; Crystal growth; X-ray photo-emission spectroscopy; Oxidation;

    机译：纳米结构;晶体生长;X射线发射光谱;氧化作用;

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