Calculation of kinetics parameter on photo-catalytic reactions using an effective radiation field model

Abstract

This study assessed the effect of the geometry and concentration of substrate in the determination of overall quantum yields. The quantum yields were obtained under an approach of constant global parameters based on the properties of isotropic radiant field and perfect distribution of particles in the fluid phase. An idealized model for quantifying the radiation field was used for reaction rate and overall volumetric rate of photon absorption (OVRPA) were obtained by means of an approximate solution of the radiative transfer equation (RTE). The results for quantum yields allowed to show the non-intrinsic nature of the kinetics parameters because of the strong influence of geometry associated to the dependence on the radiant energy absorbed by the system, evaluating these photo-kinetic parameters at constant initial concentration of dichloroacetic acid (DCA). The overall relative error between the simulation and experimental data is less than 2.5% and the correlation coefficients are greater than 0.97.