Kinetics of the gas-solid heterogeneous photocatalytic oxidation of trichloroethylene by near UV illuminated titanium dioxide |
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Authors: | Lynette A Dibble Gregory B Raupp |
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Affiliation: | (1) Department of Chemical, Bio & Materials Engineering, Arizona State University, 85287-6006 Tempe, Arizona, USA;(2) Present address: Water Chemistry Program, University of Wisconsin, 53706 Madison, WI, USA |
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Abstract: | Kinetics of the gas/solid heterogeneous photocatalytic oxidation of dilute trichloroethylene (TCE) vapors by ultraviolet-illuminated titanium dioxide have been determined using a fixed-bed dynamic photoreactor. Reaction rate dependences on inlet TCE, oxygen and water vapor concentrations were found to consist of both reactant sensitive and insensitive regions. In the reactant sensitive regions, measured limiting apparent reaction rate orders for TCE, oxygen and water vapor are 0.8, 1.7 and — 3, respectively. Water vapor in the reactant stream lowersinitial reaction rates relative to corresponding water free conditions, but is required to sustain photocatalytic activity for extended periods of time. |
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Keywords: | Ultraviolet heterogeneous photocatalysis oxidation trichloroethylene titania kinetics |
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