Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Enhanced photocatalytic Cr(VI) reduction using immobilized nanotubular TiO2 on Ti substrates and flat type photoreactor

티타늄 금속지지체에 고정화된 나노튜브 광촉매와 평판형 광반응기를 이용한 Cr(VI) 환원처리 효율 향상 연구

  • 김영지 (한국에너지기술연구원 신재생연구본부 수소연구실) ;
  • 주현규 (한국에너지기술연구원 신재생연구본부 수소연구실) ;
  • 윤재경 (한국에너지기술연구원 신재생연구본부 수소연구실)
  • Received : 2014.10.20
  • Accepted : 2015.02.06
  • Published : 2015.02.15
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Abstract

In this study, flat-type photocatalytic reaction system is applied to reduce toxic hexavalent chromium (Cr(VI)) to trivalent chromium (Cr(III)) in aqueous solution under UV irradiation. To overcome the limitation of conventional photocatalysis, a novel approach toward photocatalytic system for reduction of hexavalent chromium including nanotubular $TiO_2$ (NTT) on two kinds of titanium substrates (foil and mesh) were established. In addition, modified Ti substrates were prepared by bending treatment to increase reaction efficiency of Cr(VI) in the flat-type photocatalytic reactor. For the fabrication of NTT on Ti substrates, Ti foil and mesh was anodized with mixed electrolytes ($NH_4F-H_2O-C_2H_6O_2$) and then annealed in ambient oxygen. The prepared NTT arrays were uniformly grown on two Ti substrates and surface property measurements were performed through SEM and XRD. Hydraulic retention time(HRT) and substrate type were significantly affected the Cr(VI) reduction. Hence, the photocatalytic Cr(VI) reduction was observed to be highest up to 95% at bended(modified) Ti mesh and lowest HRT. Especially, Ti mesh was more effective as NTT substrate in this research.

Keywords

References

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