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KMID : 1024520120210040563
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Journal of the Environmental Sciences
2012 Volume.21 No. 4 p.563 ~ p.572
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Application of Light-emitting-diodes to Annular-type Photocatalytic Reactor for Removal of Indoor-level Benzene and Toluene
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Jo Wan-Kuen
Kang Hyun-Jung
Kim Kun-Hwan
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Abstract
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Unlike water applications, the photocatalytic technique utilizing light-emitting-diodes as an alternative light source to
conventional lamp has rarely been applied for low-level indoor air purification. Accordingly, this study investigated the
applicability of UV-LED to annular-type photocatalytic reactor for removal of indoor-level benzene and toluene at a low
concentration range associated with indoor air quality issues. The characteristics of photocatalyst was determined using an
X-ray diffraction meter and a scanning electron microscope. The photocatalyst baked at 350 o
C exhibited the highest
photocatalytic degradation efficiencies(PDEs) for both benzene and toluene, and the photocatalysts baked at three higher
temperatures(450, 550, and 650 o
C) did similar PDEs for these compounds. The average PDEs over a 3-h period were 81%
for benzene and close to 100% for toluene regarding the photocatalyst baked at 350 o
C, whereas they were 61 and 74% for
benzene and toluene, respectively, regarding the photocatalyst baked at 650 o
C. As the light intensity increased from 2.4 to
3.5 MW cm-1, the average PDE increased from 36 to 81% and from 44% to close to 100% for benzene and toluene,
respectively. In addition, as the flow rate increased from 0.1 to 0.5 L min-1, the average PDE decreased from 81% to close to
zero and from close to 100% to 7% for benzene and toluene, respectively. It was found that the annular-type photocatalytic
reactor inner-inserted with UV-LEDs can effectively be applied for the decomposition of low-level benzene and toluene
under the operational conditions used in this study.
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KEYWORD
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Photocatalytic degradation, Light-emitting-diode, Baking temperature, Light intensity, Flow rate
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