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KMID : 1024520080170111195
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Journal of the Environmental Sciences
2008 Volume.17 No. 11 p.1195 ~ p.1201
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Photocatalysis of o-, m- and p-Xylene Using Element-Enhanced Visible-Light Driven Titanium Dioxide
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Kim Jong-Tae
Kim Mo-Keun
Jo Wan-Kuen
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Abstract
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Enhancing with non-metallic elemental nitrogen(N) is one of several methods that have been proposed to modify the electronic properties of bulk titanium dioxide(), in order to make effective under visible-light irradiation. Accordingly, current study evaluated the feasibility of applying visible-light-induced enhanced with N element to cleanse aromatic compounds, focusing on xylene isomers at indoor air quality(IAQ) levels. The N-enhanced was prepared by applying two popular processes, and they were coated by applying two well-known methods. For three o-, m-, and p-xylene, the two coating methods exhibited different photocatalytic oxidation(PCO) efficiencies. Similarly, the two N-doping processes showed different PCO efficiencies. For all three stream flow rates(SFRs), the degradation efficiencies were similar between o-xylene and m,p-xylene. The degradation efficiencies of all target compounds increased as the SFR decreased. The degradation efficiencies determined via a PCO system with N-enhanced visible-light induced was somewhat lower than that with ultraviolet(UV)-light induced unmodified , which was reported by previous studies. Nevertheless, it is noteworthy that PCO efficiencies increased up to 94% for o-xylene and 97% for the m,p-xylene under lower SFR(0.5 L ). Consequently, it is suggested that with appropriate SFR conditions, the visible-light-assisted photocatalytic systems could also become important tools for improving IAQ.
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KEYWORD
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Xylene photocatalysis, N-Enhanced, Degradation efficiency, Doping process, Coating method
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