Skuce, R. L., Tobler, D. J., MacLaren, I. , Lee, M. R. and Phoenix, V. R. (2017) Immobilization of nanoparticles by occlusion into microbial calcite. Chemical Geology, 453, pp. 72-79. (doi: 10.1016/j.chemgeo.2017.02.005)
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Abstract
Binding of nanoparticles (NPs) to mineral surfaces influences their transport through the environment. The potential, however, for growing minerals to immobilize NPs via occlusion (the process of trapping particles inside the growing mineral) has yet to be explored in environmentally relevant systems. In this study, the ureolytic bacteria Sporosarcina pasteurii was used to induce calcium carbonate precipitation in the presence of organo-metallic manufactured nanoparticles. As calcite crystals grew the nanoparticles in the solution became trapped inside these crystals. Capture of NPs within the calcite via occlusion was verified by transmission electron microscopy of thin foils. Nanoparticles with a negative surface charge were captured with greater efficiency than those with a positive surface charge, resulting from stronger attachment of negative nanoparticles to the positively charged calcite surfaces, which in turn facilitated occlusion. Thermodynamic and kinetic analysis, however, did not reveal a significant difference in kp (calcite precipitation rate constant) or the critical saturation at which precipitation initiates (Scrit), indicating the presence of different charged nanoparticles did not influence calcite precipitation at the concentrations used here. Overall, these findings demonstrate that microbially driven mineral precipitation has potential to immobilize nanoparticles in the environment via occlusion.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Tobler, Dr Dominique and Lee, Professor Martin and MacLaren, Dr Ian and Phoenix, Dr Vernon |
| Authors: | Skuce, R. L., Tobler, D. J., MacLaren, I., Lee, M. R., and Phoenix, V. R. |
| College/School: | College of Science and Engineering > School of Geographical and Earth Sciences College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Chemical Geology |
| Publisher: | Elsevier |
| ISSN: | 0009-2541 |
| ISSN (Online): | 1872-6836 |
| Published Online: | 06 February 2017 |
| Copyright Holders: | Copyright © 2017 The Authors |
| First Published: | First published in Chemical Geology 453:72-79 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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