Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Preparation and Characterization of Visible Light-Sensitive N-doped TiO2 Using a Sol-gel Method

Sol-gel법을 이용한 백색도가 높은 가시광 응답형 N-doped TiO2 제조 및 특성 평가 연구

  • Lee, NaRi (Ceramic Ware Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Yu, Ri (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Tae Kwan (Nanotae) ;
  • Pee, Jae-Hwan (Ceramic Ware Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, YooJin (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
  • 이나리 (한국세라믹기술원 도자세라믹센터) ;
  • 유리 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 김태관 (나노태) ;
  • 피재환 (한국세라믹기술원 도자세라믹센터) ;
  • 김유진 (한국세라믹기술원 엔지니어링세라믹센터)
  • Received : 2017.11.21
  • Accepted : 2017.12.15
  • Published : 2017.12.28
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Abstract

Nitrogen-doped titanium dioxide (N-doped $TiO_2$) is attracting continuously increasing attention as a material for environmental photocatalysis. The N-atoms can occupy both interstitial and substitutional positions in the solid, with some evidence of a preference for interstitial sites. In this study, N-doped $TiO_2$ is prepared by the sol-gel method using $NH_4OH$ and $NH_4Cl$ as N ion doping agents, and the physical and photocatalytic properties with changes in the synthesis temperature and amount of agent are analyzed. The photocatalytic activities of the N-doped $TiO_2$ samples are evaluated based on the decomposition of methylene blue (MB) under visible-light irradiation. The addition of 5 wt% $NH_4Cl$ produces the best physical properties. As per the UV-vis analysis results, the N-doped $TiO_2$ exhibits a higher visible-light activity than the undoped $TiO_2$. The wavelength of the N-doped $TiO_2$ shifts to the visible-light region up to 412 nm. In addition, this sample shows MB removal of approximately 81%, with the whiteness increasing to +97 when the synthesis temperature is $600^{\circ}C$. The coloration and phase structure of the N-doped $TiO_2$ are characterized in detail using UV-vis, CIE Lab color parameter measurements, and powder X-ray diffraction (XRD).

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References

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