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Ozone-assisted photocatalytic degradation of gaseous toluene from waste air stream using silica-functionalized graphene oxide/ZnO coated on fiberglass: performance, intermediates, and mechanistic pathways.
- Source :
- Air Quality, Atmosphere & Health; Oct2019, Vol. 12 Issue 10, p1181-1188, 8p
- Publication Year :
- 2019
-
Abstract
- The present study focused on the potential of an ozone-assisted photocatalytic process using the catalyst silica-functionalized graphene oxide/ZnO coated on fiberglass (Si-GO/ZnO-FG) in the removal of toluene from waste air stream. Here, a comparative examination was performed in terms of toluene removal efficiency in the photocatalytic process (UV/Si-GO/ZnO-FG) and photocatalytic ozonation (O<subscript>3</subscript>/UV/Si-GO/ZnO-FG). The gaseous intermediates resulting from degradation of toluene by different processes were analyzed using GC-MS. The results of this study indicated that with the addition of ozone to the UV/Si-GO/ZnO-FG process, toluene removal increased significantly from 76.18 to 87.8%. The reason for this incremental efficiency can be explained by the fact that with the addition of ozone, the production rate and the extent of hydroxyl radical (OH<superscript>•</superscript>) production grow significantly; thereby, more pathways are developed for toluene degradation. The major byproducts in toluene oxidation by photocatalytic and photocatalytic ozonation processes include formic acid, acetic acid, benzyl alcohol, benzaldehyde, p-cresol, hydroquinone, and benzoic acid. Given the intermediates and the dominant oxidants detected in the aforementioned process, the possible toluene degradation pathway by the utilized process was suggested. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18739318
- Volume :
- 12
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Air Quality, Atmosphere & Health
- Publication Type :
- Academic Journal
- Accession number :
- 139365159
- Full Text :
- https://doi.org/10.1007/s11869-019-00732-6