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Decomposition of Dichloromethane and PerFluoroCompounds in Air Streams by UV/TiO2 Process
Date Issued
2009
Date
2009
Author(s)
Yeh, Ming-Lun
Abstract
The heterogeneous photocatalytic degradation of the gas-phase dichloromethane and PerFluoroCompounds (PFCs) was performed by using the UV/TiO2 process in a continuous reactor. The rectangular photoreactor contains a quartz plate coating with TiO2 thin film on it. The effect of UV light intensity, retention time, relative humidity and initial concentration of reactant on the removal and mineralization rates of dichloromethane were investigated in this study. Besides, the system was used to assess the feasibility of decomposing PFCs, the compounds with long lifetime and high global warming potential, by the UV/TiO2 process. Pt/TiO2 catalyst was prepared by photodeposition to determine the effect of Pt addition on photocatalytic efficiency. According to the analytical results, the removal and mineralization rates of dichloromethane were improved by the addition of Pt on TiO2. Neither TiO2 nor Pt/TiO2 could decompose the PFCs (CF4, C2F6) effectively attributed to their chemical stability.
Subjects
TiO2
Dichloromethane
PerFluoroCompounds (PFCs)
Global Warming Potential
Type
thesis
File(s)
No Thumbnail Available
Name
ntu-98-R96541110-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):f02faf7f6e08ea908c6abad152675f92