Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Photocatalytic removal of NOx using TiO2-coated zeolite

  • Mendoza, Joseph Albert (Department of Civil and Environmental Engineering, Dongguk University-Seoul Campus) ;
  • Lee, Dong Hoon (Department of Civil and Environmental Engineering, Dongguk University-Seoul Campus) ;
  • Kang, Joo-Hyon (Department of Civil and Environmental Engineering, Dongguk University-Seoul Campus)
  • Received : 2016.01.28
  • Accepted : 2016.04.27
  • Published : 2016.09.30
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Abstract

Application of photocatalytic nanoparticles has been recently gaining an increased attention as air purifying material for sustainable urban development. The present work reports the photocatalytic removal of gaseous phase nitrogen oxides ($NO_x$) using $TiO_2$-coated zeolite to be applied as a filter media for the urban green infrastructure such as raingardens. The $TiO_2$-coated zeolite was synthesized by simple wet chemistry method and tested in a continuous-flow photo-reactor for its removal efficiency of $NO_x$ under different conditions of the weight percentage of $TiO_2$ coated on the zeolite, and gas retention time. The removal efficiency of $NO_x$ in general increased as the weight percentage of $TiO_2$ coated on the zeolite increased up to 15-20%. Greater than 90% of $NO_x$ was removed at a retention time of one minute using the $TiO_2$-coated zeolite ($TiO_2$ weight percentage = 20%). Overall, $TiO_2$-coated zeolite showed greater efficiency of $NO_x$ removal compared to $TiO_2$ powder probably by providing additional reaction sites from the porous structure of zeolite. It was presumed that the degradation of $NO_x$ is attributed to both the physical adsorption and photocatalytic oxidation that could simultaneously occur at the catalyst surface.

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References

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