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Overall Kinetics of Heterogeneous Elemental Mercury Reactions on Tio2 Sorbent Particles With UV Radiation

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Abstract:A system consisting of a photochemical reaction was used to evaluate the kinetic parameters, such as reaction order and rate constant for the elemental mercury uptake by TiO2 in the presence of uv irradiation. TiO2 particles generated by an aerosol route were used in a fixed bed system along with commercial Degusa P25 TiO2 powders. In the presence of uv irradiation, the rate of Hg photooxidation was evaluated as a function of Hg concentration, uv intensity, and available surface area (actrivated sites). Reaction orders with respect to the gas phase mercury concentration and the uv intensity were found to be 1.40+/-0.1 and 0.35+/-0.05, respectively. For the case of in situ generated TiO2 particles, mercury concenration and uv intensity were found to be 1.1+/-0.1 and 0.390, respectively. From results of the experiments at various reaction temperatures, the apparent activation energy, and the experimentally observed rate constant were calculated.
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Citation:Lee, T. G., P. Biswas, and E. J. Hedrick. Overall Kinetics of Heterogeneous Elemental Mercury Reactions on Tio2 Sorbent Particles With UV Radiation. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. American Chemical Society, Washington, DC, 43(6):1411-1417, (2001).
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Contact: Mary P. O'Bryant - (919)-541-4871 or obriant.mary@epa.gov
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Division: Microbiological & Chemical Exposure Assessment Division
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Branch: Chemical Exposure Research Branch
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Product Type: Journal
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Published: 03/17/2004
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Downloads:
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Bullet Item Ie0303707   Exit EPA's Web Site
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