Applied Science and Convergence Technology

The Korean Vacuum Society (한국진공학회)
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Quantitative Evaluation on Photocatalytic Activity of Anatase TiO2 Nanocrystals in Aqueous Solution

  • Jeon, Byungwook (Department of Chemistry and Department of Energy Systems Research, Ajou University) ;
  • Kim, Yu Kwon (Department of Chemistry and Department of Energy Systems Research, Ajou University)
  • Received : 2015.07.20
  • Accepted : 2015.07.29
  • Published : 2015.07.30
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Abstract

Quantitative evaluation of photocatalytic activity of oxide nanoparticles in aqueous solution is quite challenging in that the kinetic reaction rate is determined by a complicated interplay among various limiting factors such as light scattering and absorption, diffusion and adsorption of reactants in condensed liquid phase, photoexcited charge separation and recombination rate, and the exact nature of active sites determined by detailed morphology and crystallinity of nanocrystals. Here, we present our simple experimental results showing that the kinetic regime of a typical photocatalytic degradation experiment over UV-irradiated $TiO_2$ nanoparticles in aqueous solution is in that dominated by the photoactivity of $TiO_2$ and its concentration. This result lays a firm ground of using the measured kinetic reaction rate in evaluating photocatalytic efficiency of oxide nanocrystals under evaluation.

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