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KMID : 1024520130220101263
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Journal of the Environmental Sciences
2013 Volume.22 No. 10 p.1263 ~ p.1271
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Control of Airborne Organic Pollutants Using Plug-Flow Reactor Coated With Carbon Material-Titania Mixtures Under Visible-Light Irradiation
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Jo Wan-Kuen
Kang Hyun-Jung
Kim Mo-Keun
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Abstract
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Graphene oxide (GO)-titania composites have emerged as an attractive heterogeneous photocatalyst that can enhance the
photocatalytic activity of TiO2 nanoparticles owing to their potential interaction of electronic and adsorption natures.
Accordingly, TiO2-GO mixtures were synthesized in this study using a simple chemical mixing process, and their
heterogeneous photocatalytic activities were investigated to determine the degradation of airborne organic pollutants (benzene,ethyl benzene, and o-xylene (BEX)) under different operational conditions. The Fourier transform infrared spectroscopy results demonstrated the presence of GO for the TiO2-GO composites. The average efficiencies of the TiO2-GO mixtures for the decomposition of each component of BEX determined during the 3-h photocatalytic processes were 26%, 92%, and 96%,respectively, whereas the average efficiencies of the unmodified TiO2 powder were 3%, 8%, and 10%, respectively.
Furthermore, the degradation efficiency of the unmodified TiO2 powder for all target compounds decreased during the 3-h
photocatalytic processes, suggesting a potential deactivation even during such a short time period. Two operational conditions(air flow entering into the air-cleaning devices and the indoor pollution levels) were found to be important factors for the photocatalytic decomposition of BEX molecules. Taken together, these results show that a TiO2-GO mixture can be applied effectively for the purification of airborne organic pollutants when the operating conditions are optimized.
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KEYWORD
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Heterogeneous photocatalyst, Airborne organic pollutant, Graphene-TiO2 mixture, FTIR spectra
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