Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Comparison of OH radical generation depending on anatase to rutile ratio of TiO2 nanotube Photocatalyst

Anatase와 Rutile 결정상 비율에 따른 TiO2 nanotube의 OH radical 생성량 비교 연구

  • Lee, Hyojoo (Department of Environmental and Energy Engineering, Seoul National University of Science and Technology) ;
  • Lee, Yongho (Department of Environmental and Energy Engineering, Seoul National University of Science and Technology) ;
  • Pak, Daewon (Department of Environmental and Energy Engineering, Seoul National University of Science and Technology)
  • 이효주 (서울과학기술대학교 에너지환경공학과) ;
  • 이용호 (서울과학기술대학교 에너지환경공학과) ;
  • 박대원 (서울과학기술대학교 에너지환경공학과)
  • Received : 2019.08.08
  • Accepted : 2019.11.18
  • Published : 2019.11.30
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Abstract

This study was carried out to improve the photocatalytic reaction of TiO2 photocatalyst. During the photocatalytic reaction, OH radicals are generated and they have an excellent oxidation capability for wastewater treatment. To evaluate the OH radicals generated according to crystallographic structure of TiO2 nanotubes photocatalyst, a probe compound, 4-Chlorobenzoic acid was monitored to evaluate OH radical. Ultraviolet light was applied for photocatalytic reaction of TiO2. The 4-Chlorobenzoic acid solution was prepared at laboratory. TiO2 nanotube was grown on titanium plate by using anodization method. The annealing temperature for TiO2 nanotube was varied from 400 to 900 ℃ and the crystal forms of the TiO2 nanotube was analyzed. Depending on annealing temperature, TiO2 nanotubes have shown different crystal forms; 100% anatase (0 % rutile), 18.4 % rutile (81.6 % anatase), 36.6 % rutile (63.4 % anatase) and 98.6% rutile (1.4% anatase). As the annealing temperature increases, the rutile ratio increases. OH radical generation from 18.4 % rutile TiO2 nanotube plate was about 3.8 times higher than before annealing and 1.4 times higher than only 100 % anatase-TiO2 nanotube. The efficiency of the 18.4% rutile TiO2 nanotube was the best in comparison to TiO2 nanotube with 18.4 %, 36.6 % and 98.6 % rutile. As a result, photocatalytic ability of 18.4 % rutile-TiO2 nanotube plate was higher than 100 % anatase-TiO2 nanotube plate.

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References

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