Effects of oxide coating and selected cations on nitrate reduction by iron metal

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

Under anoxic conditions, zerovalent iron (Fe0) reduces nitrate to ammonium and magnetite (Fe3O4) is produced at near-neutral pH. Nitrate removal was most rapid at low pH (2-4); however, the formation of a black oxide film at pH 5 to 8 temporarily halted or slowed the reaction unless the system was augmented with Fe2+, Cu2+, or Al3+. Bathing the corroding Fe0 in a Fe2+ solution greatly enhanced nitrate reduction at near-neutral pH and coincided with the formation of a black precipitate. X-ray diffractometry and scanning electron microscopy confirmed that both the black precipitate and black oxide coating on the iron surface were magnetite. In this system, ferrous iron was determined to be a partial contributor to nitrate removal, but nitrate reduction was not observed in the absence of Fe0. Nitrate removal was also enhanced by augmenting the Fe0-H2O system with Fe3+, Cu2+, or Al3+ but not Ca2+, Mg2+, or Zn2+. Our research indicates that a magnetite coating is not a hindrance to nitrate reduction by Fe0, provided sufficient aqueous Fe2+ is present in the system.

Original languageEnglish (US)
Pages (from-to)1306-1315
Number of pages10
JournalJournal of Environmental Quality
Volume32
Issue number4
StatePublished - Jul 1 2003

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Nitrates
Oxides
Cations
coating
Iron
cation
Positive ions
Metals
oxide
nitrate
iron
Coatings
Ferrosoferric Oxide
metal
Magnetite
magnetite
Precipitates
effect
Ammonium Compounds
anoxic conditions

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Effects of oxide coating and selected cations on nitrate reduction by iron metal. / Huang, Yong H.; Zhang, Tian C; Shea, Patrick J; Comfort, Steven.

In: Journal of Environmental Quality, Vol. 32, No. 4, 01.07.2003, p. 1306-1315.

Research output: Contribution to journalArticle

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AB - Under anoxic conditions, zerovalent iron (Fe0) reduces nitrate to ammonium and magnetite (Fe3O4) is produced at near-neutral pH. Nitrate removal was most rapid at low pH (2-4); however, the formation of a black oxide film at pH 5 to 8 temporarily halted or slowed the reaction unless the system was augmented with Fe2+, Cu2+, or Al3+. Bathing the corroding Fe0 in a Fe2+ solution greatly enhanced nitrate reduction at near-neutral pH and coincided with the formation of a black precipitate. X-ray diffractometry and scanning electron microscopy confirmed that both the black precipitate and black oxide coating on the iron surface were magnetite. In this system, ferrous iron was determined to be a partial contributor to nitrate removal, but nitrate reduction was not observed in the absence of Fe0. Nitrate removal was also enhanced by augmenting the Fe0-H2O system with Fe3+, Cu2+, or Al3+ but not Ca2+, Mg2+, or Zn2+. Our research indicates that a magnetite coating is not a hindrance to nitrate reduction by Fe0, provided sufficient aqueous Fe2+ is present in the system.

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