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UV-LED TiO2 photocatalytic oxidation of acetone vapor: Effect of high frequency controlled periodic illumination

Paper ID Volume ID Publish Year Pages File Format Full-Text
44865 46375 2015 7 PDF Available
Title
UV-LED TiO2 photocatalytic oxidation of acetone vapor: Effect of high frequency controlled periodic illumination
Abstract

•Influence of CPI parameters on acetone vapor photocatalytic oxidation was studied.•The lower is the duty cycle value the higher is quantum efficiency.•The lower is the CPI period the higher is quantum efficiency.•Model based on two types of active species provide a good fit for experimental data.•Lifetimes of two photoinduced active species on the TiO2 surface were estimated.

We investigated the effect of controlled periodic illumination on quantum efficiency of acetone vapor photocatalytic oxidation. It was demonstrated that quantum efficiency increases with the increase of light pulses frequency and decrease of the duty cycle and at some point reaches its maximum value which is equal to the quantum efficiency obtained under the same average photon flux. Several kinetic models were applied to the experimental data. The general conclusion was made that there are only two kinetically distinguishable active species on TiO2 surface with the lifetimes in 10−3–101 s range.

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Keywords
Photocatalysis; Controlled periodic illumination; UV LED; Titanium dioxide; Reaction kinetics simulation
First Page Preview
UV-LED TiO2 photocatalytic oxidation of acetone vapor: Effect of high frequency controlled periodic illumination
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 143–149
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis