Abiotic degradation of pentachloronitrobenzene by Fe(II): Reactions on goethite and iron oxide nanoparticles

被引:84
作者
Klupinski, TP
Chin, YP [1 ]
Traina, SJ
机构
[1] Ohio State Univ, Dept Geol Sci, Columbus, OH 43210 USA
[2] Ohio State Univ, Environm Sci Grad Program, Columbus, OH 43210 USA
[3] Ohio State Univ, Sch Nat Resources, Columbus, OH 43210 USA
关键词
D O I
10.1021/es035434j
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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(Ill) colloids and other nanoscale phases may occur in natural sediments, such abiotic reactions could significantly influence the environmental fate of nitroaromatic compounds.
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页码:4353 / 4360
页数:8
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