Competitive reduction of nitrate, nitrite, and nitrobenzene in Fe 0-water systems

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5 Citations (Scopus)

Abstract

Treating mixed contaminants with zerovalent iron (Fe0) for environmental remediation requires a thorough understanding of the competition among electron acceptors. The authors conducted aqueous batch tests to determine competitive reduction of nitrate, nitrite, and nitrobenzene by Fe0 under varying conditions. Results indicate that nitrate reduction by Fe0 was accompanied by substantial Fe0 oxidation by water. Nitrite and nitrobenzene were concomitantly reduced by Fe0, forming a lepidocrocite (γ-FeOOH) coating on the Fe0 grains. When present together, nitrite and nitrobenzene reduction proceeded without apparent interference from nitrate. Nitrate reduction, however, did not occur in the presence of nitrite or nitrobenzene. Adding aqueous Fe(II) facilitated nitrate reduction by Fe0, but not until the lepidocrocite coating on the Fe0 grains was transformed to magnetite (Fe3O4), a process that is significantly accelerated by surface-bound Fe(II). This study illustrates the relative reactivity of Fe0 towards specific compounds and the related formation and compositional evolution of the iron oxide coating in Fe0-water systems.

Original languageEnglish (US)
Article number04014029
JournalJournal of Environmental Engineering (United States)
Volume140
Issue number8
DOIs
StatePublished - Aug 1 2014

Fingerprint

Nitrobenzene
Nitrites
Nitrates
nitrite
nitrate
Water
lepidocrocite
coating
Coatings
water
Ferrosoferric Oxide
Magnetite
Iron oxides
iron oxide
magnetite
remediation
Iron
nitrobenzene
Impurities
oxidation

Keywords

  • Corrosion
  • Iron oxides
  • Nitrate
  • Nitrite
  • Nitrobenzene
  • Zerovalent iron

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Civil and Structural Engineering
  • Environmental Science(all)

Cite this

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title = "Competitive reduction of nitrate, nitrite, and nitrobenzene in Fe 0-water systems",
abstract = "Treating mixed contaminants with zerovalent iron (Fe0) for environmental remediation requires a thorough understanding of the competition among electron acceptors. The authors conducted aqueous batch tests to determine competitive reduction of nitrate, nitrite, and nitrobenzene by Fe0 under varying conditions. Results indicate that nitrate reduction by Fe0 was accompanied by substantial Fe0 oxidation by water. Nitrite and nitrobenzene were concomitantly reduced by Fe0, forming a lepidocrocite (γ-FeOOH) coating on the Fe0 grains. When present together, nitrite and nitrobenzene reduction proceeded without apparent interference from nitrate. Nitrate reduction, however, did not occur in the presence of nitrite or nitrobenzene. Adding aqueous Fe(II) facilitated nitrate reduction by Fe0, but not until the lepidocrocite coating on the Fe0 grains was transformed to magnetite (Fe3O4), a process that is significantly accelerated by surface-bound Fe(II). This study illustrates the relative reactivity of Fe0 towards specific compounds and the related formation and compositional evolution of the iron oxide coating in Fe0-water systems.",
keywords = "Corrosion, Iron oxides, Nitrate, Nitrite, Nitrobenzene, Zerovalent iron",
author = "Huang, {Yong H.} and Zhang, {Tian C.} and Shea, {Patrick J.} and Comfort, {Steve D.}",
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T1 - Competitive reduction of nitrate, nitrite, and nitrobenzene in Fe 0-water systems

AU - Huang, Yong H.

AU - Zhang, Tian C.

AU - Shea, Patrick J.

AU - Comfort, Steve D.

PY - 2014/8/1

Y1 - 2014/8/1

N2 - Treating mixed contaminants with zerovalent iron (Fe0) for environmental remediation requires a thorough understanding of the competition among electron acceptors. The authors conducted aqueous batch tests to determine competitive reduction of nitrate, nitrite, and nitrobenzene by Fe0 under varying conditions. Results indicate that nitrate reduction by Fe0 was accompanied by substantial Fe0 oxidation by water. Nitrite and nitrobenzene were concomitantly reduced by Fe0, forming a lepidocrocite (γ-FeOOH) coating on the Fe0 grains. When present together, nitrite and nitrobenzene reduction proceeded without apparent interference from nitrate. Nitrate reduction, however, did not occur in the presence of nitrite or nitrobenzene. Adding aqueous Fe(II) facilitated nitrate reduction by Fe0, but not until the lepidocrocite coating on the Fe0 grains was transformed to magnetite (Fe3O4), a process that is significantly accelerated by surface-bound Fe(II). This study illustrates the relative reactivity of Fe0 towards specific compounds and the related formation and compositional evolution of the iron oxide coating in Fe0-water systems.

AB - Treating mixed contaminants with zerovalent iron (Fe0) for environmental remediation requires a thorough understanding of the competition among electron acceptors. The authors conducted aqueous batch tests to determine competitive reduction of nitrate, nitrite, and nitrobenzene by Fe0 under varying conditions. Results indicate that nitrate reduction by Fe0 was accompanied by substantial Fe0 oxidation by water. Nitrite and nitrobenzene were concomitantly reduced by Fe0, forming a lepidocrocite (γ-FeOOH) coating on the Fe0 grains. When present together, nitrite and nitrobenzene reduction proceeded without apparent interference from nitrate. Nitrate reduction, however, did not occur in the presence of nitrite or nitrobenzene. Adding aqueous Fe(II) facilitated nitrate reduction by Fe0, but not until the lepidocrocite coating on the Fe0 grains was transformed to magnetite (Fe3O4), a process that is significantly accelerated by surface-bound Fe(II). This study illustrates the relative reactivity of Fe0 towards specific compounds and the related formation and compositional evolution of the iron oxide coating in Fe0-water systems.

KW - Corrosion

KW - Iron oxides

KW - Nitrate

KW - Nitrite

KW - Nitrobenzene

KW - Zerovalent iron

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