Characterization of TiO2 Ultrafine Particle Prepared by Low-Temperature Hydrolysis of TiCl4 in High-Concentration Hydrochloric Acid Aqueous Solution

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  • HONDA Kazuhiro
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology
  • YOSHIKAWA Takayuki
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology

Bibliographic Information

Other Title
  • 高濃度塩酸水溶液中四塩化チタンの低温加水分解反応により生成する酸化チタン超微粒子のキャラクタリゼーション
  • アナリティカルレポート 高濃度塩酸水溶液中四塩化チタンの低温加水分解反応により生成する酸化チタン超微粒子のキャラクタリゼーション
  • アナリティカルレポート コウノウド エンサン スイヨウエキ チュウ シエンカ チタン ノ テイオン カスイ ブンカイ ハンノウ ニ ヨリ セイセイ スル サンカ チタン チョウ ビリュウシ ノ キャラクタリゼーション

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Description

Ultrafine particles of TiO2 were prepared by the hydrolysis of titanium tetrachloride (TiCl4) in a highly concentrated hydrochloric acid aqueous solution at a low temperature, in which the surfacing modifier did not coexist. The absorption spectrum of the prepared TiO2 ultrafine particle showed a blue shift, which was more remarkable than that of a bulk sample. The fluorescence of the prepared TiO2 fine particles confirmed being within the ultraviolet wavelength range with a peak at 370 nm by changing the excitation wavelength from 220 nm to 300 nm. The bulk TiO2 of Rutile and Anatase type showed light absorption in proportion to the transition of inter-bands at 413 nm (3.0 eV) and 388 nm (3.2 eV), respectively. Because the excitation wavelength of 230 nm corresponds to 5.4 eV, it is converted into the band energy. The size of TiO2 identified from a laser scatter measurement was 3.5±1.0 nm, which was confirmed to be the size at which a quantum size effect appears. From the XRD measurement, secondary fine particles (aggregate) of TiO2 after separation by a membrane filter was identified to be of the Rutile type. The size of the (110), (101) and (211) crystal planes were estimated to be 5.3, 8.0 and 5.1 nm by an evaluation using the Scherrer equation for the half-value width of the diffraction peak of each crystal plane. The shape of the aggregate observed from the SEM image was tabular, of μm size. It was concluded that TiO2 fine particles with a hierarchy of sizes from nm to mm were possible by the low-temperature hydrolysis of TiCl4 in a high concentration of hydrochloric acid aqueous solution. Application to an ultraviolet ray protective agent for UVC, UVB and UVA is expected in the future.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 56 (1), 51-54, 2007

    The Japan Society for Analytical Chemistry

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