Abiotic Degradation of Pentachloronitrobenzene by Fe(II):  Reactions on Goethite and Iron Oxide Nanoparticles

Pentachloronitrobenzene is a fungicide that is degraded in anoxic soils and sediments through unknown processes that are often thought to be biologically mediated. The present research describes the kinetics for the abiotic reduction of this compound in aqueous Fe(II)/goethite systems at near-neutra...

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Bibliographic Details
Published in:Environmental science & technology 2004-08, Vol.38 (16), p.4353-4360
Main Authors: Klupinski, Theodore P, Chin, Yu-Ping, Traina, Samuel J
Format: Article
Language:English
Subjects:
Applied sciences
Aqueous chemistry
Biological and physicochemical properties of pollutants. Interaction in the soil
Contaminated sediments
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Ferric Compounds - chemistry
Fungicides, Industrial - chemistry
Iron
Iron Compounds - chemistry
Kinetics
Minerals
Nanoparticles
Nanotechnology
Nitrobenzenes - chemistry
Oxidation
Oxidation-Reduction
Particle Size
Pesticides
Pollution
Pollution, environment geology
Sediments
Soil and sediments pollution
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Summary:Pentachloronitrobenzene is a fungicide that is degraded in anoxic soils and sediments through unknown processes that are often thought to be biologically mediated. The present research describes the kinetics for the abiotic reduction of this compound in aqueous Fe(II)/goethite systems at near-neutral pH values. The results provide evidence for a rate-affecting surface-association process rather than a direct (i.e., kinetically second-order) reaction with an adsorbed Fe(II) species. It is therefore likely that the iron oxide surface participates directly in the reaction. Furthermore, reduction is observed in the apparent presence of trace amounts of suspended iron oxide nanoparticles, formed in situ by the oxidation of Fe(II). Given that Fe(III) colloids and other nanoscale phases may occur in natural sediments, such abiotic reactions could significantly influence the environmental fate of nitroaromatic compounds.
ISSN:0013-936X
1520-5851
DOI:10.1021/es035434j