Iron(III)-bearing clay minerals enhance bioreduction of nitrobenzene by shewanella putrefaciens CN32

Fubo Luan, Yan Liu, Aron M. Griffin, Christopher Aaron Gorski, William D. Burgos

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Iron-bearing clay minerals are ubiquitous in the environment, and the clay-Fe(II)/Fe(III) redox couple plays important roles in abiotic reduction of several classes of environmental contaminants. We investigated the role of Fe-bearing clay minerals on the bioreduction of nitrobenzene. In experiments with Shewanella putrefaciens CN32 and excess electron donor, we found that the Fe-bearing clay minerals montmorillonite SWy-2 and nontronite NAu-2 enhanced nitrobenzene bioreduction. On short time scales (<50 h), nitrobenzene reduction was primarily biologically driven, but at later time points, nitrobenzene reduction by biologically formed structural Fe(II) in the clay minerals became increasingly important. We found that chemically reduced (dithionite) iron-bearing clay minerals reduced nitrobenzene more rapidly than biologically reduced iron-bearing clay minerals despite the minerals having similar structural Fe(II) concentrations. We also found that chemically reduced NAu-2 reduced nitrobenzene faster as compared to chemically reduced SWy-2. The different reactivity of SWy-2 versus NAu-2 toward nitrobenzene was caused by different forms of structural clay-Fe(II) in the clay minerals and different reduction potentials (Eh) of the clay minerals. Because most contaminated aquifers become reduced via biological activity, the reactivity of biogenic clay-Fe(II) toward reducible contaminants is particularly important.

Original languageEnglish (US)
Pages (from-to)1418-1426
Number of pages9
JournalEnvironmental Science and Technology
Volume49
Issue number3
DOIs
StatePublished - Feb 3 2015

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Bearings (structural)
Clay minerals
clay mineral
Iron
iron
clay
Impurities
Dithionite
Bentonite
nontronite
nitrobenzene
pollutant
Bioactivity
Aquifers
montmorillonite
Minerals
aquifer
timescale

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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title = "Iron(III)-bearing clay minerals enhance bioreduction of nitrobenzene by shewanella putrefaciens CN32",
abstract = "Iron-bearing clay minerals are ubiquitous in the environment, and the clay-Fe(II)/Fe(III) redox couple plays important roles in abiotic reduction of several classes of environmental contaminants. We investigated the role of Fe-bearing clay minerals on the bioreduction of nitrobenzene. In experiments with Shewanella putrefaciens CN32 and excess electron donor, we found that the Fe-bearing clay minerals montmorillonite SWy-2 and nontronite NAu-2 enhanced nitrobenzene bioreduction. On short time scales (<50 h), nitrobenzene reduction was primarily biologically driven, but at later time points, nitrobenzene reduction by biologically formed structural Fe(II) in the clay minerals became increasingly important. We found that chemically reduced (dithionite) iron-bearing clay minerals reduced nitrobenzene more rapidly than biologically reduced iron-bearing clay minerals despite the minerals having similar structural Fe(II) concentrations. We also found that chemically reduced NAu-2 reduced nitrobenzene faster as compared to chemically reduced SWy-2. The different reactivity of SWy-2 versus NAu-2 toward nitrobenzene was caused by different forms of structural clay-Fe(II) in the clay minerals and different reduction potentials (Eh) of the clay minerals. Because most contaminated aquifers become reduced via biological activity, the reactivity of biogenic clay-Fe(II) toward reducible contaminants is particularly important.",
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Iron(III)-bearing clay minerals enhance bioreduction of nitrobenzene by shewanella putrefaciens CN32. / Luan, Fubo; Liu, Yan; Griffin, Aron M.; Gorski, Christopher Aaron; Burgos, William D.

In: Environmental Science and Technology, Vol. 49, No. 3, 03.02.2015, p. 1418-1426.

Research output: Contribution to journalArticle

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