Synthesis of TiO2-xNx Using Thermal Plasma and Comparison of Photocatalytic Characteristics

열플라즈마에 의한 TiO2-xNx의 합성 및 광촉매 특성 비교

  • Kim, Min-Hee (Department of Chemical Engineering and RIC-ETTP (Regional Innovation Center for Environmental Technology of Thermal Plasma), Inha University) ;
  • Park, Dong-Wha (Department of Chemical Engineering and RIC-ETTP (Regional Innovation Center for Environmental Technology of Thermal Plasma), Inha University)
  • 김민희 (인하대학교 화학공학과/열플라즈마환경기술연구센터) ;
  • 박동화 (인하대학교 화학공학과/열플라즈마환경기술연구센터)
  • Received : 2007.12.24
  • Accepted : 2008.04.14
  • Published : 2008.06.10

Abstract

$N_2$ doped $TiO_2$ nano-sized powder was prepared using a DC arc plasma jet and investigated with XRD, BET, SEM, TEM, and photo-catalytic decomposition. Recently the research interest about the nano-sized $TiO_2$ powder has been increased to improve its photo-catalytic activity for the removal of environmental pollutants. Nitrogen gas, reacting gas, and titanium tetrachloride ($TiCl_4$) were used as the raw materials and injected into the plasma reactor to synthesize the $N_2$ doped $TiO_2$ power. The particle size and XRD peaks of the synthesized powder were analyzed as a function of the flow rate of the nitrogen gas. Also, the characteristics of the photo-catalytic decomposition using the prepared powder were studied. For comparing the photo-catalytic decomposition performance of $TiO_2$ powder with that of $TiO_2$ coating, $TiO_2$ thin films were prepared by the spin coating and the pulsed laser deposition. For the results of the acetaldehyde decomposition, the photo-catalytic activity of $TiO_{2-x}N_x$ powder was higher than that of the pure $TiO_2$ powder in the visible light region. For the methylene blue decomposition, the decomposition efficiency of $TiO_2$ powder was also higher than that of $TiO_2$ film.

Acknowledgement

Supported by : 인하대학교

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