Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Xiaonan Wang, Xiangliang Pan (Lead / Corresponding author), Geoffrey Michael Gadd

Research output: Contribution to journalArticle

Abstract

Salinity can be a significant environmental stress which can govern the fate of nanoparticles in the environment as well as other factors such as pH, natural organic matter and minerals. In this research, the effects of salinity on the behavior of biogenic selenium nanoparticles (BioSeNPs) and consequences for elemental mercury (Hg0) immobilization in soil and soil solutions were investigated. It was found that homoaggregation and sedimentation of BioSeNPs were enhanced significantly with increasing salinity. Compression of the electric double layers of BioSeNPs at high ionic strengths resulted in attractive van der Waals forces dominating and leading to enhanced aggregation. Moreover, neutralization of the surface negative charge of BioSeNPs by divalent cations and the bridging of BioSeNPs via calcium binding to surface functional groups were also associated with enhanced aggregation. Such enhanced aggregation exerted inhibition of Hg0 immobilization in soil solutions/soils of varying salinity. These results indicate that salinity is an important environmental factor governing aggregation of BioSeNPs and therefore influencing the efficiency of Hg0 immobilization, and possible remediation treatments, as a consequence.

Original languageEnglish
Pages (from-to)303-309
Number of pages7
JournalScience of the Total Environment
Volume668
Early online date1 Mar 2019
DOIs
Publication statusPublished - 10 Jun 2019

Fingerprint

Mercury
Selenium
immobilization
selenium
Nanoparticles
Soils
salinity
Agglomeration
soil
Organic minerals
Van der Waals forces
Divalent Cations
neutralization
environmental stress
nanoparticle
mercury
Ionic strength
Remediation
Sedimentation
Biological materials

Keywords

  • Selenium nanoparticles
  • Salinity
  • Aggregation
  • Mercury immobilization

Cite this

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title = "Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity",
abstract = "Salinity can be a significant environmental stress which can govern the fate of nanoparticles in the environment as well as other factors such as pH, natural organic matter and minerals. In this research, the effects of salinity on the behavior of biogenic selenium nanoparticles (BioSeNPs) and consequences for elemental mercury (Hg0) immobilization in soil and soil solutions were investigated. It was found that homoaggregation and sedimentation of BioSeNPs were enhanced significantly with increasing salinity. Compression of the electric double layers of BioSeNPs at high ionic strengths resulted in attractive van der Waals forces dominating and leading to enhanced aggregation. Moreover, neutralization of the surface negative charge of BioSeNPs by divalent cations and the bridging of BioSeNPs via calcium binding to surface functional groups were also associated with enhanced aggregation. Such enhanced aggregation exerted inhibition of Hg0 immobilization in soil solutions/soils of varying salinity. These results indicate that salinity is an important environmental factor governing aggregation of BioSeNPs and therefore influencing the efficiency of Hg0 immobilization, and possible remediation treatments, as a consequence.",
keywords = "Selenium nanoparticles, Salinity, Aggregation, Mercury immobilization",
author = "Xiaonan Wang and Xiangliang Pan and Gadd, {Geoffrey Michael}",
note = "This work was supported by the National Key Research and Development Program of China (2018YFC1802901 and 2018YFC1802902) and the National Natural Science Foundation of China (U1503281 and U1403181). G. M. Gadd gratefully acknowledges an award (NE/M01090/1) under the National Environmental Research Council (UK) Security of Supply of Mineral Resources Grant Program: Tellurium and Selenium Cycling and Supply (TeASe). G. M. Gadd gratefully acknowledges financial support of the Geomicrobiology Group by NERC [NE/M011275/1: (CoG3)]. We also acknowledge financial support from the China Scholarship Council and the British Council through the UK-China Joint Research and Innovation Partnership Fund PhD Placement Programme to X. Wang (No. 201703780058).",
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Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity. / Wang, Xiaonan; Pan, Xiangliang (Lead / Corresponding author); Gadd, Geoffrey Michael.

In: Science of the Total Environment, Vol. 668, 10.06.2019, p. 303-309.

Research output: Contribution to journalArticle

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AU - Wang, Xiaonan

AU - Pan, Xiangliang

AU - Gadd, Geoffrey Michael

N1 - This work was supported by the National Key Research and Development Program of China (2018YFC1802901 and 2018YFC1802902) and the National Natural Science Foundation of China (U1503281 and U1403181). G. M. Gadd gratefully acknowledges an award (NE/M01090/1) under the National Environmental Research Council (UK) Security of Supply of Mineral Resources Grant Program: Tellurium and Selenium Cycling and Supply (TeASe). G. M. Gadd gratefully acknowledges financial support of the Geomicrobiology Group by NERC [NE/M011275/1: (CoG3)]. We also acknowledge financial support from the China Scholarship Council and the British Council through the UK-China Joint Research and Innovation Partnership Fund PhD Placement Programme to X. Wang (No. 201703780058).

PY - 2019/6/10

Y1 - 2019/6/10

N2 - Salinity can be a significant environmental stress which can govern the fate of nanoparticles in the environment as well as other factors such as pH, natural organic matter and minerals. In this research, the effects of salinity on the behavior of biogenic selenium nanoparticles (BioSeNPs) and consequences for elemental mercury (Hg0) immobilization in soil and soil solutions were investigated. It was found that homoaggregation and sedimentation of BioSeNPs were enhanced significantly with increasing salinity. Compression of the electric double layers of BioSeNPs at high ionic strengths resulted in attractive van der Waals forces dominating and leading to enhanced aggregation. Moreover, neutralization of the surface negative charge of BioSeNPs by divalent cations and the bridging of BioSeNPs via calcium binding to surface functional groups were also associated with enhanced aggregation. Such enhanced aggregation exerted inhibition of Hg0 immobilization in soil solutions/soils of varying salinity. These results indicate that salinity is an important environmental factor governing aggregation of BioSeNPs and therefore influencing the efficiency of Hg0 immobilization, and possible remediation treatments, as a consequence.

AB - Salinity can be a significant environmental stress which can govern the fate of nanoparticles in the environment as well as other factors such as pH, natural organic matter and minerals. In this research, the effects of salinity on the behavior of biogenic selenium nanoparticles (BioSeNPs) and consequences for elemental mercury (Hg0) immobilization in soil and soil solutions were investigated. It was found that homoaggregation and sedimentation of BioSeNPs were enhanced significantly with increasing salinity. Compression of the electric double layers of BioSeNPs at high ionic strengths resulted in attractive van der Waals forces dominating and leading to enhanced aggregation. Moreover, neutralization of the surface negative charge of BioSeNPs by divalent cations and the bridging of BioSeNPs via calcium binding to surface functional groups were also associated with enhanced aggregation. Such enhanced aggregation exerted inhibition of Hg0 immobilization in soil solutions/soils of varying salinity. These results indicate that salinity is an important environmental factor governing aggregation of BioSeNPs and therefore influencing the efficiency of Hg0 immobilization, and possible remediation treatments, as a consequence.

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