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• W2049862421 abstract "The photocatalytic degradation of polychlorinated dibenzo-p-dioxins (PCDDs), which include mono-, tetra-, hepta-, and octachlorinated congeners (MCDD, TCDD, HpCDD and OCDD), was carried out on TiO2 films under UV (λ > 300 nm) or solar light irradiation in the air. All the dioxin congeners tested were successfully degraded on TiO2 while the direct photolysis of them in the absence of TiO2 was negligible. The photocatalytic degradation rates of PCDDs decreased with the number of chlorines and were described by the first-order reaction kinetics with half-lives of 5.8, 3.9, 0.71, and 0.38 h for OCDD, HpCDD, TCDD, and MCDD, respectively. The degradation rates increased with light intensity and TiO2 coating weights up to 2 mW/cm2 (300 < λ < 400 nm) and 200 μg of TiO2/cm2, respectively. Further increases in either the light intensity or the TiO2 coating mass did not much affect the degradation rate. The natural solar light under clear sky conditions was as effective as a 200-W mercury lamp irradiation (filtered through a Pyrex filter) in degrading OCDD on TiO2. The photocatalytic degradation of PCDDs seems to be initiated by OH radical attack and not by conduction band electron transfer. From a diffuse reflectance FTIR study, the degradation of OCDD was found to involve the cleavage of the aromatic ring. Neither stable intermediates nor dechlorinated PCDDs were detected during the photocatalytic degradation." @default.
• W2049862421 created "2016-06-24" @default.
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• W2049862421 date "2000-10-05" @default.
• W2049862421 modified "2023-09-26" @default.
• W2049862421 title "Photocatalytic Degradation of Polychlorinated Dibenzo-<i>p</i>-dioxins on TiO₂ Film under UV or Solar Light Irradiation" @default.
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• W2049862421 doi "https://doi.org/10.1021/es0011461" @default.
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