Environmental Engineering Research

  • 제23권2호
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  • Pages.181-188
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  • 2018
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  • 1226-1025(pISSN)
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  • 2005-968X(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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Enhanced photocatalytic oxidation of humic acids using Fe3+-Zn2+ co-doped TiO2: The effects of ions in aqueous solutions

  • Yuan, Rongfang (Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing) ;
  • Liu, Dan (Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing) ;
  • Wang, Shaona (Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing) ;
  • Zhou, Beihai (Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing) ;
  • Ma, Fangshu (Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing)
  • 투고 : 2017.05.17
  • 심사 : 2017.08.14
  • 발행 : 2018.06.30
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초록

Photocatalytic oxidation in the presence of Fe-doped, Zn-doped or Fe-Zn co-doped $TiO_2$ was used to effectively decompose humic acids (HAs) in water. The highest HAs removal efficiency (65.7%) was achieved in the presence of $500^{\circ}C$ calcined 0.0010% Fe-Zn co-doped $TiO_2$ with the Fe:Zn ratio of 3:2. The initial solution pH value, inorganic cations and anions also affected the catalyst photocatalytic ability. The HAs removal for the initial pH of 2 was the highest, and for the pH of 6 was the lowest. The photocatalytic oxidation of HAs was enhanced with the increase of the $Ca^{2+}$ or $Mg^{2+}$ concentration, and reduced when concentrations of some anions increased. The inhibition order of the anions on $TiO_2$ photocatalytic activities was $CO{_3}^{2-}$ > $HCO_3{^-}$ > $Cl^-$, but a slightly promotion was achieved when $SO{_4}^{2-}$ was added. Total organic carbon (TOC) removal was used to evaluate the actual HAs mineralization degree caused by the $500^{\circ}C$ calcined 0.0010% Fe-Zn (3:2) co-doped $TiO_2$. For tap water added with HAs, the $UV_{254}$ and TOC removal rates were 57.2% and 49.9%, respectively. The $UV_{254}$ removal efficiency was higher than that of TOC because of the generation of intermediates that could significantly reduce the $UV_{254}$, but not the TOC.

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