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Title: Photodegradation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans: Direct photolysis and photocatalysis processes
Authors: Wu, C.-H.
Ng, H.-Y. 
Keywords: Coupled catalyst
Direct photolysis
Issue Date: 1-Mar-2008
Citation: Wu, C.-H., Ng, H.-Y. (2008-03-01). Photodegradation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans: Direct photolysis and photocatalysis processes. Journal of Hazardous Materials 151 (2-3) : 507-514. ScholarBank@NUS Repository.
Abstract: This study employed direct photolysis to treat mixed polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) solutions. The solutions included a synthetic standard 17 2, 3, 7, 8-substituted congeners solution and a practical liquid extracted from the bag filter ash of an electric arc furnace. Additionally, this work utilized a coupled catalyst (ZnO/SnO2) under UV irradiation for photocatalytic degradation of 1, 2, 3, 6, 7, 8-HxCDD and OCDD. The direct photolysis rate of PCDFs was faster than that of PCDDs. The degradation rate of international toxicity equivalency quantity (I-TEQ) for PCDDs and PCDFs in the synthetic standard solution was 1.369 and 1.472 h-1, respectively, and that in the ash-extracted solution was 0.061 and 0.117 h-1, respectively. The rate of photocatalytic degradation declined as the number of chlorine atoms increased. No 2, 3, 7, 8-substituted congeners were identified during photocatalytic degradation; additionally, the photolytic rate of the UV/coupled catalyst was higher than that of UV/single catalyst system. Experimental results suggested that the primary degradation pathway for direct photolysis and photocatalysis of PCDD/Fs was the C{single bond}Cl cleavage and C{single bond}O cleavage, respectively. © 2007 Elsevier B.V. All rights reserved.
Source Title: Journal of Hazardous Materials
ISSN: 03043894
DOI: 10.1016/j.jhazmat.2007.06.020
Appears in Collections:Staff Publications

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