한국분말재료학회지 (Journal of Powder Materials)

  • 제27권2호
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  • Pages.132-138
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  • 2020
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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One-pot 습식화학공정을 이용한 TiO2 중공 구조체 제조 및 광촉매 활성 연구

Fabrication and Photocatalytic Activity of TiO2 Hollow Structures using One-pot Wet Chemical Process

  • 이덕희 (고등기술연구원 융합소재연구센터) ;
  • 박경수 (고등기술연구원 융합소재연구센터) ;
  • 박재량 (고등기술연구원 융합소재연구센터) ;
  • 이찬기 (고등기술연구원 융합소재연구센터)
  • Lee, Duk-Hee (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering) ;
  • Park, Kyung-Soo (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering) ;
  • Park, Jae-Ryang (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering) ;
  • Lee, Chan-Gi (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering)
  • 투고 : 2020.04.07
  • 심사 : 2020.04.23
  • 발행 : 2020.04.28
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초록

A facile one-pot wet chemical process to prepare pure anatase TiO2 hollow structures using ammonium hexafluorotitanate as a precursor is developed. By defining the formic acid ratio, we fabricate TiO2 hollow structures containing fluorine on the surface. The TiO2 hollow sphere is composed of an anatase phase containing fluorine by various analytical techniques. A possible formation mechanism for the obtained hollow samples by self-transformation and Ostwald ripening is proposed. The TiO2 hollow structures containing fluorine exhibits 1.2 - 2.7 times higher performance than their counterparts in photocatalytic activity. The enhanced photocatalytic activity of the TiO2 hollow structures is attributed to the combined effects of high crystallinity, specific surface area (62 ㎡g-1), and the advantage of surface fluorine ions (at 8%) having strong electron-withdrawing ability of the surface ≡ Ti-F groups reduces the recombination of photogenerated electrons and holes.

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