Reduction of As(V) to As(III) by commercial ZVI or As(0) with acid-treated ZVI

Fenglong Sun, Kwadwo Asare Osseo-Asare, Yongsheng Chen, Brian A. Dempsey

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Zero-valent iron (ZVI) consists of an elemental iron core surrounded by a shell of corrosion products, especially magnetite. ZVI is used for in situ removal or immobilization of a variety of contaminants but the mechanisms for removal of arsenic remain controversial and the mobility of arsenic after reaction with ZVI is uncertain. These issues were addressed by separately studying reactions of As(V) with magnetite, commercial ZVI, and acid-treated ZVI. Strictly anoxic conditions were used. Adsorption of As(V) on magnetite was fast with pH dependence similar to previous reports using oxic conditions. As(V) was not reduced by magnetite and Fe(II) although the reaction is thermodynamically spontaneous. As(V) reactions with ZVI were also fast and no lag phase was observed which was contrary to previous reports. Commercial ZVI reduced As(V) to As(III) only when As(V) was adsorbed, i.e., for pH < 7. As(III) was not released to solution. Acid-treated ZVI reduced As(V) to As(0), shown using wet chemical analyses and XANES/EXAFS. Comparisons were drawn between reactivity of acid-treated ZVI and nano-ZVI; if true then acid-treated ZVI could provide similar reactive benefits at lower cost.

Original languageEnglish (US)
Pages (from-to)311-317
Number of pages7
JournalJournal of Hazardous Materials
Volume196
DOIs
StatePublished - Nov 30 2011

Fingerprint

Iron
iron
Acids
acid
Ferrosoferric Oxide
Magnetite
magnetite
Arsenic
arsenic
Corrosion
oxic conditions
anoxic conditions
immobilization
Immobilization
corrosion
Adsorption
shell
adsorption
Impurities
Costs and Cost Analysis

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Sun, Fenglong ; Osseo-Asare, Kwadwo Asare ; Chen, Yongsheng ; Dempsey, Brian A. / Reduction of As(V) to As(III) by commercial ZVI or As(0) with acid-treated ZVI. In: Journal of Hazardous Materials. 2011 ; Vol. 196. pp. 311-317.
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Reduction of As(V) to As(III) by commercial ZVI or As(0) with acid-treated ZVI. / Sun, Fenglong; Osseo-Asare, Kwadwo Asare; Chen, Yongsheng; Dempsey, Brian A.

In: Journal of Hazardous Materials, Vol. 196, 30.11.2011, p. 311-317.

Research output: Contribution to journalArticle

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AU - Osseo-Asare, Kwadwo Asare

AU - Chen, Yongsheng

AU - Dempsey, Brian A.

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