Optimising the transport properties and reactivity of microbially-synthesised magnetite for in situ remediation

Nimisha Joshi (Lead / Corresponding author), Feixue Liu, Mathew Paul Watts, Heather Williams, Victoria S. Coker, Doris Schmid, Thilo Hofmann, Jonathan R. Lloyd (Lead / Corresponding author)

Research output: Contribution to journalArticle

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Abstract

Engineered nanoparticles offer the potential for remediation of land and water that has been contaminated by organics and metals. Microbially synthesized nano-scale magnetite, prepared from Fe(III) oxides by subsurface Fe(III)-reducing bacteria, offers a scalable biosynthesis route to such a nano-scale remediation reagent. To underpin delivery of "bionanomagnetite" (BNM) nanomaterial during in situ treatment options, we conducted a range of batch and column experiments to assess and optimise the transport and reactivity of the particles in porous media. Collectively these experiments, which include state of the art gamma imaging of the transport of99mTc-labelled BNM in columns, showed that non-toxic, low cost coatings such as guar gum and salts of humic acid can be used to enhance the mobility of the nanomaterial, while maintaining reactivity against target contaminants. Furthermore, BNM reactivity can be enhanced by the addition of surface coatings of nano-Pd, extending the operational lifetime of the BNM, in the presence of a simple electron donor such as hydrogen or formate.

Original languageEnglish
Article number4246
Pages (from-to)1-12
Number of pages12
JournalScientific Reports
Volume8
DOIs
Publication statusPublished - 9 Mar 2018

Fingerprint

Ferrosoferric Oxide
guar gum
formic acid
Nanostructures
Humic Substances
Nanoparticles
Oxides
Hydrogen
Salts
Metals
Electrons
Bacteria
Costs and Cost Analysis
Water

Keywords

  • Journal article
  • Biogeochemistry
  • Pollution remediation

Cite this

Joshi, Nimisha ; Liu, Feixue ; Watts, Mathew Paul ; Williams, Heather ; Coker, Victoria S. ; Schmid, Doris ; Hofmann, Thilo ; Lloyd, Jonathan R. / Optimising the transport properties and reactivity of microbially-synthesised magnetite for in situ remediation. In: Scientific Reports. 2018 ; Vol. 8. pp. 1-12.
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Optimising the transport properties and reactivity of microbially-synthesised magnetite for in situ remediation. / Joshi, Nimisha (Lead / Corresponding author); Liu, Feixue; Watts, Mathew Paul; Williams, Heather; Coker, Victoria S.; Schmid, Doris; Hofmann, Thilo; Lloyd, Jonathan R. (Lead / Corresponding author).

In: Scientific Reports, Vol. 8, 4246, 09.03.2018, p. 1-12.

Research output: Contribution to journalArticle

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AU - Joshi, Nimisha

AU - Liu, Feixue

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AU - Coker, Victoria S.

AU - Schmid, Doris

AU - Hofmann, Thilo

AU - Lloyd, Jonathan R.

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N2 - Engineered nanoparticles offer the potential for remediation of land and water that has been contaminated by organics and metals. Microbially synthesized nano-scale magnetite, prepared from Fe(III) oxides by subsurface Fe(III)-reducing bacteria, offers a scalable biosynthesis route to such a nano-scale remediation reagent. To underpin delivery of "bionanomagnetite" (BNM) nanomaterial during in situ treatment options, we conducted a range of batch and column experiments to assess and optimise the transport and reactivity of the particles in porous media. Collectively these experiments, which include state of the art gamma imaging of the transport of99mTc-labelled BNM in columns, showed that non-toxic, low cost coatings such as guar gum and salts of humic acid can be used to enhance the mobility of the nanomaterial, while maintaining reactivity against target contaminants. Furthermore, BNM reactivity can be enhanced by the addition of surface coatings of nano-Pd, extending the operational lifetime of the BNM, in the presence of a simple electron donor such as hydrogen or formate.

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