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Cited by 29Mine drainage and remediation techniquesEnvironmental remediation with nanomaterialsMetal Extraction and Bioleaching

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The reductive immobilization of aqueous Se(IV) by natural pyrrhotite

Ma, Bin, Kang, Mingliang, Zheng, Zhong, Chen, Fanrong, Xie, Jinglin, Charlet, Laurent, Liu, Chunli·2014·Journal of Hazardous Materials
DOI 10.1016/j.jhazmat.2014.05.066
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Abstract

The interaction of Se(IV) with natural pyrrhotite was investigated at pH conditions ranging from acidic to nearly neutral. The results indicate that the reduction rate can be described in terms of a pseudo-first order reaction. At pH ∼4.0 to ∼5.0, the rate decreased with increasing pH. Unexpectedly, at pH ∼5.0, the rate increased with increasing reaction time. This response was also observed at pH ∼6.0. Two different reaction mechanisms were proposed to explain pyrrhotite oxidation by Se(IV). Because pyrrhotite is acid-soluble and can be attacked by both Fe(3+) and protons, direct reduction by the released aqueous sulfide dominates the reaction at low pH, whereas the cyclic oxidation of aqueous Fe(2+) adsorbed on pyrrhotite surfaces becomes predominant at high pH. Phosphate, which can be irreversibly bound to Fe(3+) intermediates even under acidic conditions, can significantly decrease the reaction rate by an order of magnitude at pH ∼4.5. In contrast to the thermodynamic calculations and the predicted prevalence of FeSe based on previous reports of aqueous Se(IV) reduction by synthetic mackinawite or troilite, only Se(0) was observed as the reaction product in this study. This observation confirmed that a slow reaction favors the formation of Se(0) rather than iron selenides.

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  • Birnessite is able to oxidize Se(IV) to Se(VI), while the oxidation of Fe(II)-bearing minerals may lead to the reductive immobilization of aqueous Se(IV) to Se(0).

    “Birnessite is able to oxidize Se(IV) to Se(VI), while the oxidation of Fe(II)-bearing minerals may lead to the reductive immobilization of aqueous Se(IV) to Se(0) [32].”

    From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [32]

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References 47 · Cited by 29

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Metadata

Authors
Ma, B., Kang, M., Zheng, Z., Chen, F., Xie, J., Charlet, L., & Liu, C.
Affiliations
  • Peking University (CN)
  • Sun Yat-sen University (CN)
  • Chinese Academy of Sciences (CN)
  • Université Joseph Fourier (FR)
Corresponding author
  • Kang, Mingliang
  • Liu, Chunli
ORCID
Venue
Journal of Hazardous Materials
Publisher
Elsevier BV
Published
2014-07
Volume
276
Pages
422-432
ISSN
0304-3894 (ISSN-L)
DOI
10.1016/j.jhazmat.2014.05.066
OpenAlex
W2053255960
Cited by
29
References
47
Citations by year
2025: 3 · 2024: 3 · 2023: 3 · 2022: 7 · 2021: 1 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 3 · 2016: 3 · 2015: 1
FWCI
1.78
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Journal of Hazardous Materials (publishedVersion)
  • PubMed (publishedVersion)
Funders
Beijing Synchrotron Radiation Facility
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Mine drainage and remediation techniques
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
  • Physical Sciences › Materials Science › Metals and Alloys › Metal Extraction and Bioleaching
Keywords
pyrrhotite, reductive immobilization, selenium speciation, FeSe, iron(II) oxidation, phosphate adsorption, sulfide reduction, reaction kinetics, pH dependence
MeSH terms
Kinetics, Minerals, Oxidation-Reduction, Selenium, Sulfides, Photoelectron Spectroscopy, Iron Compounds

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