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KMID : 1024520120210111321
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Journal of the Environmental Sciences
2012 Volume.21 No. 11 p.1321 ~ p.1331
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Purification of BTEX at Indoor Air Levels Using Carbon and Nitrogen Co-Doped Titania under Different Conditions
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Jo Wan-Kuen
Kang Hyun-Jung
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Abstract
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To date, carbon and nitrogen co-doped photocatalysts (CN-TiO2) for environmental application focused mainly on the
aqueous phase to investigate the decomposition of water pollutants. Accordingly, the present study explored the photocatalytic
performance of CN-TiO2 photocatalysts for the purification of indoor-level gas-phase aromatic species under different
operational conditions. The characteristics of prepared photocatalysts were investigated using X-ray diffraction, scanning
emission microscope, diffuse reflectance UV-VIS-NIR analysis, and Fourier transform infrared (FTIR) analysis. In most cases,the decomposition efficiency for the target compounds exhibited a decreasing trend as input concentration (IC) increased.
Specifically, the average decomposition efficiencies for benzene, toluene, ethyl benzene, and xylene (BTEX) over a 3-h
process decreased from 29% to close to zero, 80 to 5%, 95 to 19%, and 99 to 32%, respectively, as the IC increased from 0.1 to 2.0 ppm. The decomposition efficiencies obtained from the CN-TiO2 photocatalytic system were higher than those of the TiO2 system.
As relative humidity (RH) increased from 20 to 95%, the decomposition efficiencies for BTEX decreased from 39 to
5%, 97 to 59%, 100 to 87%, and 100 to 92%, respectively. In addition, as the stream flow rates (SFRs) decreased from 3.0 to
1.0 L min-1, the average efficiencies for BTEX increased from 0 to 58%, 63 to 100%, 69 to 100%, and 68 to 100%,
respectively. Taken together, these findings suggest that three (IC, RH, and SFR) should be considered for better BTEX
decomposition efficiencies when applying CN-TiO2 photocatalytic technology to purification of indoor air BTEX.
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KEYWORD
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Decomposition efficiency, Aromatic species, Input concentration, Relative humidity, Stream flow rate
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