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Environmental Engineering Research 2008;13(1): 14-18. DOI: https://doi.org/10.4491/eer.2008.13.1.014
Gaseous by-products from the TiO2 Photocatalytic Oxidation of Benzene
Sang-Wook Han1, Jin-Hong Lee1, Jin Seog Kim2, Sang-Hyub Oh2, Young-Kwon Park3, and Hyunook Kim3
1Department of Environmental Engineering, Chungnam National University, Daejeon 305-764, Korea
2Chemical Metrology and Materials Evaluation Division, Korea Research Institute of Standards and Science, Daejeon 305-600, Korea
3Department of Environmental Engineering, University of Seoul, Seoul 130-743, Korea
Corresponding Author: Jin-Hong Lee ,Tel: +82-42-823-7546, Fax: +82-42-822-5610, Email: jinlee@cnu.ac.kr
Received: February 9, 2007;  Accepted: December 9, 2007.
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ABSTRACT
Photocatalytic oxidations of benzene gas using the closed system (batch reactor) were induced to determine its by-products and investigate the effect of humidity and oxygen concentration on their generation. The study was able to identify 11 gaseous by-products: 2-methylpropene, acetaldehyde, acetone, pentane, methylcyclobutane, methylcyclopentane, cyclohexane, 2,3-dimethylbutane, 2-methylpentane, 3-methylpentane, and hexane. All the by-products were saturated hydrocarbons, which are less toxic than benzene and were probably formed through hydrogenation reaction on the photocatalytic surface. The photocatalytic oxidation of benzene under higher humidity produced less by-products. However, the amount of acetone released increased with higher humidity and oxygen concentration.
Keywords: Photocatalytic oxidation | Titanium dioxide | Benzene | By-products | Permissible exposure limits
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