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http://dx.doi.org/10.15681/KSWE.2019.35.5.418

A Study on the Possibility of Dye Wastewater Treatment of Electrical Photocatalytic System Using TiO2 nanotube plate  

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)
Publication Information
Journal of Korean Society on Water Environment / v.35, no.5, 2019 , pp. 418-424 More about this Journal
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.
Keywords
Decolorization efficiency; Dye wastewater; Photoelectrolysis; $TiO_2$ nanotube plate;
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