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Photocatalysis of Low Concentration of Gaseous-Phase Benzene Using Visible-Light Irradiated N-doped and S-doped Titanium Dioxide
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  • Journal title : Environmental Engineering Research
  • Volume 13, Issue 4,  2008, pp.171-176
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2008.13.4.171
 Title & Authors
Photocatalysis of Low Concentration of Gaseous-Phase Benzene Using Visible-Light Irradiated N-doped and S-doped Titanium Dioxide
Jo, Wan-Kuen; Kim, Jong-Tae;
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Studies on visible-light-driven photocatalysis of air pollutants at indoor air quality (IAQ) levels have been limited. Current study investigated visible-light derived photocatalysis with N-doped and S-doped titanium dioxide () for the control of benzene at indoor levels. Two preparation processes were employed for each of the two types of photocatalyst: urea-Degussa P-25 and titania-colloid methods for the N-doped ; and titanium isopropoxid- and tetraisopropoxide-thiourea methods for the S-doped . Furthermore, two coating methods (EDTA- and acetylacetone-dissolving methods) were tested for both the N-doped and S-doped . The two coating methods exhibited different photocatalytic degradation efficiency for the N-doped photocatalysts, whereas they did not exhibit any difference for the S-doped photocatalysts. In addition, the two doping processes showed different photocatalytic degradation efficiency for both the S-doped and N-doped photocatalysts. For both the N-doped and S-doped , the photocatalytic oxidation (PCO) efficiency increased as the hydraulic diameter (HD) decreased. The degradation efficiency determined via a PCO system with visible-light induced was lower than that with UV-light induced unmodified , which was obtained from previous studies. Nevertheless, it is noteworthy that for the photocatalytic annular reactor with the HD of 0.5 cm, PCO efficiency increased up to 52% for the N-doped and 60% for the S-doped . Consequently, when combined with the advantage of visible light use over UV light use, it is suggested that with appropriate HD conditions, the visible-light-assisted photocatalytic systems can also become an important tool for improving IAQ.
Photocatalytic oxidation;;Coating method;Doping process;
 Cited by
Utilization of Element-doping Titania-impregnated Granular Activated Carbon in a Plug-flow System for Removal of BTEX,Jo, Wan-Kuen;Shin, Seung-Ho;Hwang, Eun-Song;Yang, Sung-Bong;

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