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Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model
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Fiderman Machuca
Published/Copyright:
December 8, 2016
Abstract
Global quantum yield and overall volumetric rate of photon absorption (OVRPA) were quantified for TiO2-based photocatalytic degradation of dichloroacetic acid (DCA) in a differential perfect-mixture reactor. A kinetic model that involves physic and radiant energy parameters is proposed for describing this reaction. The considered system behaves as an isotropic and completely-mixed slurry, and found kinetic parameters do not depend on the spatial coordinates but strictly on the effective specific-radiation phase field present in the reaction vessel. The simplified mathematical model was analytically solved for finding the generatrix function, and the parameters fitting was achieved by means of a modified Newton-Raphson’s method. Obtained values for the global quantum yield are consistent with the physic behavior of the studied system. The kinetics results have an overall associated relative-error less than 4,5%.
Keywords: Heterogeneous Photocatalysis; Dichloroacetic acid; global quantum yield; overall volumetric rate; photon absorption; modeling
Received: 2007-9-3
Revised: 2007-11-16
Accepted: 2007-11-17
Published Online: 2016-12-8
Published in Print: 2008-1-1
© 2016 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Heterogeneous Photocatalysis;
Dichloroacetic acid;
global quantum yield;
overall volumetric rate;
photon absorption;
modeling
Articles in the same Issue
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- An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
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