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Kinetic modeling of photocatalytic degradation reactions: Effect of charge trapping

Paper ID Volume ID Publish Year Pages File Format Full-Text
47894 46485 2008 10 PDF Available
Title
Kinetic modeling of photocatalytic degradation reactions: Effect of charge trapping
Abstract

This study investigates the important role of charge trapping in a photocatalytic degradation kinetic model. Different charge trapping reactions were coupled with photocatalytic degradation reaction schemes. The resulting kinetic models were applied to formate and trichloroethylene (TCE) in aqueous and gas phase, respectively. In both cases addition of charge trapping improved the reliability of the kinetic models. Hence, two dissipative charge reactions are considered in the new model: electron–hole recombination with second-order kinetics and charge trapping with first-order kinetics. For the formate system, it was shown that accounting for UV irradiance effects on a mechanistic basis requires the incorporation of charge trapping effects in the kinetic model. The improved model fitted literature data to within experimental error. A reasonable mechanism was suggested for degradation of TCE which involves three electron–hole pairs for the complete mineralization of one molecule of TCE. A kinetic model of TCE degradation via three main steps, along with considering charge trapping can explain the kinetic data with the same accuracy as an existing model of Demeestere et al., but with a more realistic electron–hole pair requirement, and added flexibility to account for light intensity effects.

Keywords
Charge trapping; Kinetic modeling; Photocatalytic degradation; UV irradiance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 65–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us