TIO2 PHOTOCATALYSIS FOR INDOOR AIR APPLICATIONS - EFFECTS OF HUMIDITY AND TRACE CONTAMINANT LEVELS ON THE OXIDATION RATES OF FORMALDEHYDE, TOLUENE, AND 1,3-BUTADIENE
Obee, TN; Brown, RT
HERO ID
1578884
Reference Type
Journal Article
Year
1995
Language
English
PMID
| HERO ID | 1578884 |
|---|---|
| In Press | No |
| Year | 1995 |
| Title | TIO2 PHOTOCATALYSIS FOR INDOOR AIR APPLICATIONS - EFFECTS OF HUMIDITY AND TRACE CONTAMINANT LEVELS ON THE OXIDATION RATES OF FORMALDEHYDE, TOLUENE, AND 1,3-BUTADIENE |
| Authors | Obee, TN; Brown, RT |
| Journal | Environmental Science & Technology |
| Volume | 29 |
| Issue | 5 |
| Page Numbers | 1223-1231 |
| Abstract | The effect of water vapor on the photooxidation of three gases was studied. The gases studied were formaldehyde (50000), toluene (108883), and 1,3-butadiene (106990). Variations in ultraviolet intensity and flow residence time were also considered. Titanium-dioxide (TiO2) was used as a photooxidative catalyst, and ultraviolet intensities in the milliwatt per square centimeter ranged were used. The data indicated that the reaction was first order for the three reactants at the sub part per million (ppm) level. The sub ppm level was chosen as the level found in actual buildings, transportation vehicles, and commercial aircraft. Competitive adsorption between water and trace contaminants had a significant effect on the oxidation rate. The dependencies of humidity and contaminant concentrations on the oxidation rates were considered to be the results of competitive adsorption on available hydroxyl adsorption sites and of changes in hydroxyl radical population levels. At the sub ppm level, the oxidation rate increased with decreasing humidity for humidity levels above 1,000ppm. The reaction rate was first order. |
| Doi | 10.1021/es00005a013 |
| Pmid | 22192015 |
| Wosid | WOS:A1995QV75000024 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:A1995QV75000024 |
| Is Public | Yes |
| Language Text | English |