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Cited by 105Mine drainage and remediation techniquesEnvironmental remediation with nanomaterialsEnvironmental and Analytical Chemistry Studies

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Colloidal Properties of Nanoparticular Biogenic Selenium Govern Environmental Fate and Bioremediation Effectiveness

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Buchs, Benjamin, Evangelou, Michael W. H., Winkel, Lenny H. E., Lenz, Markus·2013·Environmental Science & Technology
DOI 10.1021/es304940s
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Abstract

Microbial selenium (Se) bioremediation is based on conversion of water soluble, toxic Se oxyanions to water insoluble, elemental Se. Formed biogenic elemental Se is of nanometer size, hampering straightforward separation from the aqueous phase. This study represents the first systematic investigation on colloidal properties of pure biogenic Se suspensions, linking electrophoretic mobility (ζ-potential) to column settling behavior. It was demonstrated that circumneutral pH, commonly applied in bioremediation, is not appropriate for gravitational separation due to the negative ζ-potential preventing agglomeration. Mono/di/trivalent counter cations and acidity (protons) were used to screen efficiently the intrinsic negative charge of biogenic Se suspensions at circumneutral pH. Fast settling was induced by La(3+) addition in the micromolar range (86.2 ± 3.5% within 0.5 h), whereas considerably higher concentrations were needed when Ca(2+) or Na(+) was used. Colloidal stability was furthermore studied in different model waters. It was demonstrated that surface waters as such represent a fragile system regarding colloidal stability of biogenic Se suspensions (ζ-potential ∼ -30 mV), whereas dissolved organic matter increases colloidal stability. In marine waters, biogenic Se is colloidally destabilized and is thus expected to settle, representing a potential sink for Se during transport in the aquatic environment.

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Metadata

Authors
Buchs, B., Evangelou, M. W. H., Winkel, L. H. E., & Lenz, M.
Affiliations
  • FHNW University of Applied Sciences and Arts Northwestern Switzerland (CH)
  • ETH Zurich (CH)
Corresponding author
Lenz, Markus
ORCID
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2013-02-19
Volume
47
Issue
5
Pages
2401-2407
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
DOI
10.1021/es304940s
OpenAlex
W2119340097
Cited by
105
References
0
Citations by year
2026: 3 · 2025: 2 · 2024: 7 · 2023: 5 · 2022: 9 · 2021: 11 · 2020: 9 · 2019: 2 · 2018: 16 · 2017: 13 · 2016: 8 · 2015: 13 · 2014: 5 · 2013: 2
FWCI
7.42
Type
journal article
Language
en
Open access
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
  • Socio-Environmental Systems Modeling (acceptedVersion)
  • DORA Eawag (Swiss Federal Institute of Aquatic Science and Technology (Eawag)) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Funders
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Mine drainage and remediation techniques
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
  • Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
Keywords
elemental selenium nanoparticles, colloidal stability, zeta potential, electrophoretic mobility, counterions, lanthanum, dissolved organic matter, seawater, surface water, selenium bioremediation, colloid transport
MeSH terms
Biodegradation, Environmental, Colloids, Selenium, Water, Water Pollutants, Chemical, Nanoparticles

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