Aerobic and anaerobic biosynthesis of nano-selenium for remediation of mercury contaminated soil

Xiaonan Wang; Daoyong Zhang; Xiangliang Pan; Duu Jong Lee; Fahad A. Al-Misned; M. Golam Mortuza; Geoffrey Michael Gadd

doi:10.1016/j.chemosphere.2016.12.020

Aerobic and anaerobic biosynthesis of nano-selenium for remediation of mercury contaminated soil

Xiaonan Wang, Daoyong Zhang, Xiangliang Pan (Lead / Corresponding author), Duu Jong Lee, Fahad A. Al-Misned, M. Golam Mortuza, Geoffrey Michael Gadd

Molecular Microbiology

Research output: Contribution to journal › Article › peer-review

114 Citations (Scopus)

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Abstract

Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se⁰) under both aerobic and anaerobic conditions. The biogenic nano-Se⁰ converted 45.8–57.1% and 39.1–48.6% of elemental mercury (Hg⁰) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg⁰ remediation, probably owing to the release of intracellular nano-Se⁰ from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se⁰ and Hg⁰. Biosynthesis of nano-Se⁰ both aerobically and anaerobically therefore provides a versatile and cost-effective remediation approach for Hg⁰-contaminated surface and subsurface soils, where the redox potential often changes dramatically.

Original language	English
Pages (from-to)	266-273
Number of pages	8
Journal	Chemosphere
Volume	170
Early online date	5 Dec 2016
DOIs	https://doi.org/10.1016/j.chemosphere.2016.12.020
Publication status	Published - 1 Mar 2017

Keywords

Bioremediation
Mercury
Metal immobilization
Selenium
Selenium nanoparticles

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry

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10.1016/j.chemosphere.2016.12.020

Author Accepted Manuscript
© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 255 KBLicence: CC BY-NC-ND

Cite this

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title = "Aerobic and anaerobic biosynthesis of nano-selenium for remediation of mercury contaminated soil",

abstract = "Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se0) under both aerobic and anaerobic conditions. The biogenic nano-Se0 converted 45.8–57.1% and 39.1–48.6% of elemental mercury (Hg0) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg0 remediation, probably owing to the release of intracellular nano-Se0 from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se0 and Hg0. Biosynthesis of nano-Se0 both aerobically and anaerobically therefore provides a versatile and cost-effective remediation approach for Hg0-contaminated surface and subsurface soils, where the redox potential often changes dramatically.",

keywords = "Bioremediation, Mercury, Metal immobilization, Selenium, Selenium nanoparticles",

author = "Xiaonan Wang and Daoyong Zhang and Xiangliang Pan and Lee, {Duu Jong} and Al-Misned, {Fahad A.} and Mortuza, {M. Golam} and Gadd, {Geoffrey Michael}",

note = "This work was supported by the National Natural Science Foundation of China (U1120302 and 21177127). G. M. Gadd gratefully acknowledges receipt of an award under the Chinese Government{\textquoteright}s 1000 Talents Plan with the Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China. G. M. Gadd also 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). Partial funding for this research was also received from the Visiting Professor Program at King Saud University, Riyadh, Saudi Arabia.",

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AU - Wang, Xiaonan

AU - Zhang, Daoyong

AU - Pan, Xiangliang

AU - Lee, Duu Jong

AU - Al-Misned, Fahad A.

AU - Mortuza, M. Golam

AU - Gadd, Geoffrey Michael

N1 - This work was supported by the National Natural Science Foundation of China (U1120302 and 21177127). G. M. Gadd gratefully acknowledges receipt of an award under the Chinese Government’s 1000 Talents Plan with the Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China. G. M. Gadd also 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). Partial funding for this research was also received from the Visiting Professor Program at King Saud University, Riyadh, Saudi Arabia.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se0) under both aerobic and anaerobic conditions. The biogenic nano-Se0 converted 45.8–57.1% and 39.1–48.6% of elemental mercury (Hg0) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg0 remediation, probably owing to the release of intracellular nano-Se0 from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se0 and Hg0. Biosynthesis of nano-Se0 both aerobically and anaerobically therefore provides a versatile and cost-effective remediation approach for Hg0-contaminated surface and subsurface soils, where the redox potential often changes dramatically.

AB - Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se0) under both aerobic and anaerobic conditions. The biogenic nano-Se0 converted 45.8–57.1% and 39.1–48.6% of elemental mercury (Hg0) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg0 remediation, probably owing to the release of intracellular nano-Se0 from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se0 and Hg0. Biosynthesis of nano-Se0 both aerobically and anaerobically therefore provides a versatile and cost-effective remediation approach for Hg0-contaminated surface and subsurface soils, where the redox potential often changes dramatically.

KW - Bioremediation

KW - Mercury

KW - Metal immobilization

KW - Selenium

KW - Selenium nanoparticles

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SN - 0045-6535

VL - 170

SP - 266

EP - 273

JO - Chemosphere

JF - Chemosphere

ER -

Aerobic and anaerobic biosynthesis of nano-selenium for remediation of mercury contaminated soil

Abstract

Keywords

ASJC Scopus subject areas

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Tellurium and Selenium Cycling and Supply (Joint with Universities of Leicester, Durham, Edinburgh, Cardiff, Aberdeen and Open University and Natural History Museum)

COG3: The Geology, Geometallurgy and Geomicrobiology of Cobalt Resources Leading to New Product Streams (joint with Natural History Museum and Universities of Manchester, Bangor, Exeter, Loughborough and Southampton and Industrial Partner)

Cite this

Aerobic and anaerobic biosynthesis of nano-selenium for remediation of mercury contaminated soil

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Projects

Tellurium and Selenium Cycling and Supply (Joint with Universities of Leicester, Durham, Edinburgh, Cardiff, Aberdeen and Open University and Natural History Museum)

COG3: The Geology, Geometallurgy and Geomicrobiology of Cobalt Resources Leading to New Product Streams (joint with Natural History Museum and Universities of Manchester, Bangor, Exeter, Loughborough and Southampton and Industrial Partner)

Cite this