期刊
BUILDING AND ENVIRONMENT
卷 51, 期 -, 页码 345-350出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2011.12.007
关键词
TiO2; Formaldehyde; Photo-catalyst; Silver; Cerium
资金
- National high technology Research and Development Program of China [2011AA03A406]
- Beijing Municipal Education Commission [KM201110005011]
As a main indoor air pollutant, formaldehyde was chosen as the aim pollutant Nano-structured TiO2, Ag -TiO2 and Ce-TiO2 thin films were prepared by sol-gel method at room temperature and used in the photo-catalyst reactor for HCHO decomposition. The effects of doped Ag/Ce/TiO2, relative humidity, oxygen concentration, initial HCHO concentration, UV light wavelength, TiO2 amount on HCHO decomposition were investigated. The results showed that doped Ag or Ce ions could enhance the photo-catalyst ability. 35% was the optimal humidity for photo-catalyst process under the experimental conditions. Higher concentration of oxygen was better for HCHO removal. Photo-catalytic degradation rates decreased with increasing HCHO initial concentration. Illumination using a 254 nm light source was better than 365 nm. The photo-catalytic degradation efficiency increased with the increasing the amount of TiO2 when TiO2 amount was lower than 70 mg. The reaction rate constant (k) of TiO2, Ag/TiO2, Ce/TiO2 was sequenced k(Ce/TiO2) > k(Ag/TiO2) > k(TiO2), meaning that Ce/TiO2 had the best photo-catalytic ability among the catalysts. (C) 2011 Elsevier Ltd. All rights reserved.
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