Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20712
Title: Enhancement effect of TiO2 immobilized on activated carbon filter for the photodegradation of pollutants at typical indoor air level
Authors: Ao, CH
Lee, SC 
Keywords: Adsorbent
Hong Kong
Indoor air
NO
VOCs
Issue Date: 2003
Publisher: Elsevier
Source: Applied catalysis B : environmental, 2003, v. 44, no. 3, p. 191-205 How to cite?
Journal: Applied catalysis B : environmental 
Abstract: The competition effect between water vapor and pollutants at ppb level for adsorption sites has been previously reported. It was found that at high humidity levels, the pollutant photodegradation rate reduced drastically. To improve the photodegradation of pollutants at ppb level and at high humidity levels, TiO2 is immobilized on an activated carbon (AC) filter. 200 ppb of nitrogen oxide (NO) and 20 ppb of benzene, toluene, ethylbenzene and o-xylene (BTEX) were chosen as target pollutants. Sensitivity analyses were conducted for NO and BTEX under different residence times and levels of humidity. Results showed that the combination of TiO2 and AC significantly increased NO and BTEX removals at short residence time and high humidity levels. TiO2 immobilized on AC filter was less affected by the increasing humidity levels. NO2, as an intermediate generated from the photodegradation of NO, was also successively suppressed from exiting the system. Deactivation from the photodegradation of NO was suppressed by immobilizing TiO2 on an activated carbon filter. The use of activated carbon acted as a local pollutant concentrator by adsorbing pollutants from the air stream and thereby diffused to the TiO2 for photodegradation.
URI: http://hdl.handle.net/10397/20712
ISSN: 0926-3373
EISSN: 1873-3883
DOI: 10.1016/S0926-3373(03)00054-7
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