Water Remediation from Recalcitrant Pollution Using the Galvano-Fenton Process: A Modeling Approach of the Hydroxyl Radical Generation and the Energy Efficiency
Abstract
The hydroxyl radical is the most powerful oxidant after fluorine, and is the key reactant of the
advanced oxidation processes AOP. Monitoring the kinetics of formation and reaction of this short life species
is one of the challenging tasks from an experimental point of view. Thus, modelling is suggested to be one
efficient tool for a comprehensive and predictive study of AOPs, particularly the Galvano-Fenton process. In the
present study, mathematical modelling is used to describe the kinetics of hydroxyl radical 𝐻𝑂• generation and
organic substrate 𝑅𝑂 degradation within the Galvano-Fenton process, based on the spontaneous galvanic
corrosion of iron waste and in situ ferrous ion catalyst generation. A range of typical absolute kinetic constants
of 106 à 1010 M-1.s-1 is considered to characterize the attack of 𝑅𝑂 species by 𝐻𝑂•. Phenol is presented as a
model pollutant for a total mineralization model. The numerical simulations demonstration a quasi-linear
evolution of hydroxyl radical production during the first stage of the Galvano-Fenton process. A comparison of
the Galvano-Fenton process with the classic Fenton in terms of kinetics, and electro-Fenton in terms of
energetic performance, revealed that the spontaneous galvanic generation of ferrous ions in the Galvano-Fenton
process leads to a higher rate of the reaction a higher instantaneous concentration of ferric ions accompanying
the release of hydroxyl radicals and hence a better oxidation efficiency, as well as a positive energy balance. A
particular attention was given to the ratio of the degradation efficiency to the released energy.
Details
| Primary Language | English |
|---|---|
| Subjects | Engineering |
| Journal Section | Articles |
| Authors | |
| Publication Date | December 31, 2022 |
| Published in Issue | Year 2022Volume: 21 |
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