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

Nimisha Joshi; Feixue Liu; Mathew Paul Watts; Heather Williams; Victoria S. Coker; Doris Schmid; Thilo Hofmann; Jonathan R. Lloyd

doi:10.1038/s41598-018-21733-y

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)

Molecular Microbiology

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

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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 language	English
Article number	4246
Pages (from-to)	1-12
Number of pages	12
Journal	Scientific Reports
Volume	8
DOIs	https://doi.org/10.1038/s41598-018-21733-y
Publication status	Published - 9 Mar 2018

Keywords

Journal article
Biogeochemistry
Pollution remediation

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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.",

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author = "Nimisha Joshi and Feixue Liu and Watts, {Mathew Paul} and Heather Williams and Coker, {Victoria S.} and Doris Schmid and Thilo Hofmann and Lloyd, {Jonathan R.}",

note = "This research work has been supported by funding from the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 309517 (NANOREM)",

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doi = "10.1038/s41598-018-21733-y",

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AU - Joshi, Nimisha

AU - Liu, Feixue

AU - Watts, Mathew Paul

AU - Williams, Heather

AU - Coker, Victoria S.

AU - Schmid, Doris

AU - Hofmann, Thilo

AU - Lloyd, Jonathan R.

N1 - This research work has been supported by funding from the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 309517 (NANOREM)

PY - 2018/3/9

Y1 - 2018/3/9

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.

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

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