Abstract
This work presents a new approach and a comprehensive mechanism to study the kinetics of the photodegradation of the organic pollutants. The vital role of various operational factors on the degradation of the organic pollutants is explained using this method. The proposed approach is based on the simple strategies and a powerful computational method. Two new variables "the effective concentration of photon" (Ieff) and "the effective concentration of the reactive centers" (RC) are defined to better understand the effect of operational parameters on the organic pollutant photodegradation. The optimum conditions of the photocatalytic degradation can be determined with the help of this method. This approach was used to study the kinetics of photodegradation of the organic pollutants on the [Formula: see text] photocatalysts. The provided mechanism has been examined with the some experimental data. The high correlations between the experimental data and the fitting results under different conditions prove this mechanism could be reliable.
Highlights
Water is one of the essential needs of all life-supporting processes (Westall &Brack 2018)
The interaction of the catalyst with other substances in the solution under UV/vis light 233 illumination leads us to define a set of the reactive-centers on the photocatalyst surface
The results of our work show the fitting process is affected by changing the value of the rate constant for the reaction of the conduction band (CB) electrons with the reactive-centers of the RC3, RC4, and RC5
Summary
Water is one of the essential needs of all life-supporting processes (Westall &Brack 2018). The adsorbed water species on the surface of photocatalysts are oxidized by the valence 107 band holes to produce the hydroxyl radicals (Muhd Julkapli et al 2014) These processes leads to the production of the reactive-centers for the degradation of organic pollutant molecules. The interaction of B component with some species in the system, such as oxygen molecules and water species, leads to the formation of the other reactive-centers The coupling these materials with a photocatalyst can be a suitable method to achieve enhanced photocatalytic activity. The real mechanism of the photodegradation of organic pollutants involves several steps, 136 and their nature is not fully understood These kind of processes depend on various 137 experimental conditions including the type of reactants, the solution pH, the concentration of reactants, and the photocatalyst surface structure. A useful comparison between the rate constants of the first step and the rate constants of the other steps is provided by a proposed variable named as “the effective concentration of photons”
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