Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Study on the Possibility of Dye Wastewater Treatment of Electrical Photocatalytic System Using TiO2 nanotube plate

TiO2 nanotube plate를 이용한 전기적광촉매시스템의 염료폐수 처리 가능성 연구

  • Lee, Yongho (Department of Environmental Energy Engineering, Graduate School of Energy and Environment, Seoul National University of Science & Technology) ;
  • Sun, Minghao (Department of Environmental Energy Engineering, Graduate School of Energy and Environment, Seoul National University of Science & Technology) ;
  • Pak, Daewon (Department of Environmental Energy Engineering, Graduate School of Energy and Environment, Seoul National University of Science & Technology)
  • 이용호 (서울과학기술대학교 에너지환경대학원 에너지환경공학과) ;
  • 쑨밍하오 (서울과학기술대학교 에너지환경대학원 에너지환경공학과) ;
  • 박대원 (서울과학기술대학교 에너지환경대학원 에너지환경공학과)
  • Received : 2019.06.18
  • Accepted : 2019.09.09
  • Published : 2019.09.30
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Abstract

In this study, $TiO_2$ nanotubes with different morphologies were prepared in the electrolyte consisting of ethylene glycol, ammonium fluoride($NH_4F$), and deionized water($H_2O$) by controlling the voltage and time in the anodization method. Thicknesses and pore sizes of these $TiO_2$ nanotubes were measured to interpret the relationship between anodization conditions and $TiO_2$ nanotube morphologies. Element contents in the $TiO_2$ nanotubes were detected for further analysis of $TiO_2$ nanotube characteristics. Photoelectrolyticdecolorization efficiencies of the $TiO_2$ nanotube plates with various morphologies were tested to clarify the morphology that a highly active $TiO_2$ nanotube plate should have. Influences of applied voltage in photoelectrolysis processes and sodium sulfate($Na_2SO_4$) concentration in wastewater on the decolorization efficiency were also studied. To save the equipment investment cost in photoelectrolysis methods, a two-photoelectrode system that uses the $TiO_2$ nanotube plates as photoanode and photocathode instead of adding other counter electrodes was studied. Compared with single-photoelectrode system that uses the $TiO_2$ nanotube plate as photoanode and titanium plate as cathode on the view of the treatment of dye wastewater containing different amounts of salt. As a result, a considerably suitable voltage was strictly needed for enhancing the photoelectrolyticdecolorization effect of the two-photoelectrode system but if salts exist in wastewater, an excellent increase in the decolorization efficiency can be obtained.

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References

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