Abstract
One of the difficulties of establishing the intrinsic kinetics of photocatalytic oxidation processes is due to the complex mathematical formula used to determine the rate of photon absorption. To solve this problem, some models have been proposed and checked, such as the Six Flux Model (SFM) confirmed in central lamp photoreactors. External lamp photoreactors are also one of the most used configurations to study the photocatalytic oxidation of contaminants in water, and complex mathematical solutions have been reported to solve the rate of photon absorption. In this work, SFM Equations already reported for the central lamp photoreactor have been adapted to determine the rate of photon absorption in an external four-lamp photoreactor. The results obtained show slight differences from those of the Monte Carlo method. Additionally, once the rate of photon absorption was validated, the intrinsic rate constant and scavenging factor of the photocatalytic oxidation of some contaminant compounds from results already published have been determined.
Highlights
It is well known that Advanced Oxidation Processes (AOPs), are the only technologies capable of destroying water contaminants at ambient conditions due to the high oxidizing power of hydroxyl radicals generated in these processes [1,2]
Photocatalytic oxidation (PCO) of water contaminants with ozonation and Fenton oxidation are some of the advanced oxidation processes that have attracted a lot of research interest in the last two decades [3,4,5,6,7]
The radius of the lamp considered in Equation (1) was the diameter of the radius of any lamp of the external lamp photoreactor since it is assumed that only one lamp situated in the central axis of the photoreactor substitutes, as a radiation source, the four lamps of the actual photoreactor
Summary
It is well known that Advanced Oxidation Processes (AOPs), are the only technologies capable of destroying water contaminants at ambient conditions due to the high oxidizing power of hydroxyl radicals generated in these processes [1,2]. Methods based on the probability that one photon can be dispersed after its collision with the catalyst particle by following different directions have been proposed [16,17] Six Flux Model (SFM), which is based on the six cartesian directions that the photon can follow after any collision, has been checked and confirmed in a cylindrical photoreactor with a central located UV lamp (central lamp photoreactor). This configuration is likely the preferred option to study the PCO of water contaminants [18,19]. A second objective was to determine the rate constant of the reaction of some organics in PCO once the OVRPA has been determined, that is, the intrinsic kinetics of PCO
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