TY - JOUR
T1 - Photo-catalytic degradation of gaseous formaldehyde by TiO 2/UV, Ag/TiO 2/UV and Ce/TiO 2/UV
AU - Liang, Wenjun
AU - Li, Jian
AU - Jin, Yuquan
PY - 2012/5
Y1 - 2012/5
N2 - As a main indoor air pollutant, formaldehyde was chosen as the aim pollutant. Nano-structured TiO 2, Ag-TiO 2 and Ce-TiO 2 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/TiO 2, relative humidity, oxygen concentration, initial HCHO concentration, UV light wavelength, TiO 2 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 254nm light source was better than 365nm. The photo-catalytic degradation efficiency increased with the increasing the amount of TiO 2 when TiO 2 amount was lower than 70mg. The reaction rate constant (k) of TiO 2, Ag/TiO 2, Ce/TiO 2 was sequenced k Ce/TiO2>k Ag/TiO2>k TiO2, meaning that Ce/TiO 2 had the best photo-catalytic ability among the catalysts.
AB - As a main indoor air pollutant, formaldehyde was chosen as the aim pollutant. Nano-structured TiO 2, Ag-TiO 2 and Ce-TiO 2 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/TiO 2, relative humidity, oxygen concentration, initial HCHO concentration, UV light wavelength, TiO 2 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 254nm light source was better than 365nm. The photo-catalytic degradation efficiency increased with the increasing the amount of TiO 2 when TiO 2 amount was lower than 70mg. The reaction rate constant (k) of TiO 2, Ag/TiO 2, Ce/TiO 2 was sequenced k Ce/TiO2>k Ag/TiO2>k TiO2, meaning that Ce/TiO 2 had the best photo-catalytic ability among the catalysts.
KW - Cerium
KW - Formaldehyde
KW - Photo-catalyst
KW - Silver
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=84855179776&partnerID=8YFLogxK
U2 - 10.1016/j.buildenv.2011.12.007
DO - 10.1016/j.buildenv.2011.12.007
M3 - Article
AN - SCOPUS:84855179776
SN - 0360-1323
VL - 51
SP - 345
EP - 350
JO - Building and Environment
JF - Building and Environment
ER -