Environmental catalysis and materials

Formaldehyde degradation by UV/TiO2/O3process usingcontinuous flow mode


QI Hong , SUN De-zhi , CHI Guo-qing

DOI:

Received November 04, 2006,Revised March 12, 2007, Accepted , Available online

Volume 19,2007,Pages 1136-1140

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The degradation of formaldehyde gas was studied using UV/TiO2/O3 process under the condition of continuous flow mode. The effects of humidity, initial formaldehyde concentration, residence time and ozone adding amount on degradation of formaldehyde gas were investigated. The experimental results indicated that the combination of ozonation with photocatalytic oxidation on the degradation of formaldehyde showed a synergetic action, e.g., it could considerably increase decomposing of formaldehyde. The degradation e ciency of formaldehyde was between 73.6% and 79.4% while the initial concentration in the range of 1.84–24 mg/m3 by O3/TiO2/UV process. The optimal humidity was about 50% in UV/TiO2/O2 processs and degradation of formaldehyde increases from 39.0% to 94.1% when the ozone content increased from 0 to 141 mg/m2. Furthermore, the kinetics of formaldehyde degradation reaction could be described by Langmuir-Hinshelwood model. The rate constant k of 46.72 mg/(m3·min) and Langmuir adsorption coe cient K of 0.0268 m3/mg were obtained.

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