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http://dx.doi.org/10.4491/eer.2008.13.1.028

Photocatalytic Degradation of 2,4,6-Trinitrotoluene in Wastewater Using a Thin-Film TiO2 Reactor  

Shin, Gi-Bum (Department of Environmental Engineering, Kangwon National University)
Kim, Yeong-Kwan (Department of Environmental Engineering, Kangwon National University)
Publication Information
Environmental Engineering Research / v.13, no.1, 2008 , pp. 28-32 More about this Journal
Abstract
The photocatalytic treatment of water contaminated with 2,4,6-trinitrotoluene (TNT) was explored in bench-scale experiments in batch mode using a Pyrex tube coated with a thin film of $TiO_2$ located inside a photoreactor. The reactor was aerated by purging it with compressed air before initiating the photocatalytic reaction. The rate of TNT degradation approximated first-order kinetics. The reaction rate constant decreased as the TNT concentration increased from 25 to 100 mg/L, while the first-order kinetics could be modeled using a Langmuir adsorption isotherm. The addition of the organic reductants methanol and EDTA significantly enhanced the rate of TNT degradation, with optimum results in the presence of 20% methanol by volume. EDTA increased the rate of TNT removal by enhancing the role of the reductants.
Keywords
TNT; $TiO_2$ thin-film; Photoreactor; Degradation; Adsorption; Kinetics;
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