Photo-catalytic degradation of gaseous formaldehyde by TiO 2/UV, Ag/TiO 2/UV and Ce/TiO 2/UV

Wenjun Liang*, Jian Li, Yuquan Jin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)345-350
Number of pages6
JournalBuilding and Environment
Volume51
DOIs
Publication statusPublished - May 2012
Externally publishedYes

Keywords

  • Cerium
  • Formaldehyde
  • Photo-catalyst
  • Silver
  • TiO

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Liang, W., Li, J., & Jin, Y. (2012). Photo-catalytic degradation of gaseous formaldehyde by TiO 2/UV, Ag/TiO 2/UV and Ce/TiO 2/UV. Building and Environment, 51, 345-350. https://doi.org/10.1016/j.buildenv.2011.12.007