Kinetics of the chemical reduction of nitrate by zero-valent iron

The use of reactive barriers is one of the preferred remediation technologies for the remediation of groundwater contamination. An adequate design of these barriers requires the understanding of the kinetics of the reaction between the target contaminant and the solid phase in the barrier. A study o...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2009-02, Vol.74 (6), p.804-809
Main Authors: Rodríguez-Maroto, J.M., García-Herruzo, F., García-Rubio, A., Gómez-Lahoz, C., Vereda-Alonso, C.
Format: Article
Language:English
Subjects:
Applied sciences
dosage
Eley-Rideal kinetics
Environmental Restoration and Remediation
Exact sciences and technology
groundwater contamination
Hydrogen-Ion Concentration
iron
Iron - chemistry
Kinetics
nitrate reduction
nitrates
Nitrates - chemistry
Oxidation-Reduction
Permeable reactive barrier
Pollution
Reduction nitrate
remediation
Temperature
Zero-valent iron
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Summary:The use of reactive barriers is one of the preferred remediation technologies for the remediation of groundwater contamination. An adequate design of these barriers requires the understanding of the kinetics of the reaction between the target contaminant and the solid phase in the barrier. A study of the kinetics between metallic iron and aqueous nitrate is presented in this paper. Published literature regarding this reaction indicates that researchers are far from a consensus about the mechanism of this reaction. This paper presents the results obtained from experiments performed at different constant pH values and iron dosages, together with a mathematical analysis of the kinetic results. We have found that an Eley–Rideal kinetic model yields a good explanation of the relatively complicated dependence between rate of nitrate reduction and the pH value of the solution.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2008.10.020