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Cited by 209Arsenic contamination and mitigationGeochemistry and Elemental AnalysisEnvironmental remediation with nanomaterials

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Arsenite Oxidation by a Poorly Crystalline Manganese-Oxide 1. Stirred-Flow Experiments

Lafferty, Brandon J., Ginder-Vogel, Matthew, Sparks, Donald L.·2010·Environmental Science & Technology
DOI 10.1021/es102013p
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Abstract

Manganese-oxides (Mn-oxides) are quite reactive, with respect to arsenite (As(III)) oxidation. However, studies regarding the pathways of As(III) oxidation, over a range of time scales, by poorly crystalline Mn-oxides, are lacking. In stirred-flow experiments, As(III) oxidation by δ-MnO₂ (a poorly crystalline form of hexagonal birnessite) is initially rapid but slows appreciably after several hours of reaction. Mn(II) is the only reduced product of δ-MnO₂ formed by As(III) oxidation during the initial, most rapid phase of the reaction. There seems to be evidence that the formation of Mn(III) observed in previous studies is a result of conproportionation of Mn(II) sorbed onto Mn(IV) reaction sites rather than from direct reduction of Mn(IV) by As(III).The only evidence of arsenic (As) sorption during As(III) oxidation by δ-MnO₂ is during the first 10 h of reaction, and As sorption is greater when As(V) and Mn(II) occur simultaneously in solution. Our findings indicate that As(III) oxidation by poorly crystalline δ-MnO₂ involves several simultaneous reactions and reinforces the importance of studying reaction mechanisms over time.

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  • Lafferty et al. demonstrated that arsenate sorbed onto a manganese oxide formed bidentate binuclear and monodentate mononuclear complexes after a few hours, but at longer time a bidentate-mononuclear complex also formed.

    “Lafferty et al. [21] demonstrated that arsenate sorbed onto a manganese oxide formed bidentate binuclear and monodentate mononuclear complexes after a few hours, but at longer time a bidentate -mononuclear complex also formed.”

    From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [21]

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References 33 · Cited by 209

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Metadata

Authors
Lafferty, B. J., Ginder-Vogel, M., & Sparks, D. L.
Affiliations
University of Delaware (US)
Corresponding author
Lafferty, Brandon J.
ORCID
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2010-10-26
Volume
44
Issue
22
Pages
8460-8466
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
DOI
10.1021/es102013p
OpenAlex
W2330680230
Cited by
209
References
33
Citations by year
2026: 8 · 2025: 10 · 2024: 8 · 2023: 15 · 2022: 18 · 2021: 9 · 2020: 18 · 2019: 14 · 2018: 21 · 2017: 11 · 2016: 10 · 2015: 20 · 2014: 15 · 2013: 12 · 2012: 11
FWCI
8.57
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
Keywords
arsenite oxidation, arsenite, manganese oxide, δ-MnO2, birnessite, arsenic sorption, arsenate, reaction mechanism
MeSH terms
Adsorption, Crystallization, Oxidation-Reduction, Oxides, Manganese Compounds, Arsenites

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