화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.46, 416-425, February, 2017
Photocatalytic oxidation of gas-phase Hg0 by carbon spheres supported visible-light-driven CuO-TiO2
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A simplified approach for the fabrication of CuO/TiO2@C is demonstrated. In this study, low cost CuO/TiO2@C photocatalysts (CSs loading 0.25-2 wt.%) were prepared, characterized and evaluated for gasphase Hg0 oxidation. The obtained CuO/TiO2@C photocatalysts were used to remove gaseous elemental mercury under UV light and LED respectively, and the optimum doping of content of CSs was determined. The results showed that the CuO/TiO2@C photocatalysts were highly efficient in oxidizing Hg0, reaching above 64% when the CSs doping reached 0.5 wt.%. We have proposed that the probable mechanism by which CuO/TiO2@C photocatalysts remove gaseous elemental mercury: with CSs doping, CSs can act as sensitizer and transfer electrons to the semiconductors, triggering the formation of very reactive radicals to improve photocatalytic efficiency.