Formation of biologically influenced palladium microstructures by Desulfovibrio desulfuricans and Desulfovibrio ferrophilus IS5.

Autor: Voegtlin SP; Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Canada., Barnes RJ; Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Canada; Department of Biological Sciences, University of Calgary, Calgary, Canada., Hubert CRJ; Department of Biological Sciences, University of Calgary, Calgary, Canada., Larter SR; Department of Geosciences, University of Calgary, Calgary, Canada., Bryant SL; Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Canada. Electronic address: Steven.Bryant@ucalgary.ca.
Jazyk: angličtina
Zdroj: New biotechnology [N Biotechnol] 2022 Dec 25; Vol. 72, pp. 128-138. Date of Electronic Publication: 2022 Nov 14.
DOI: 10.1016/j.nbt.2022.11.001
Abstrakt: A range of Desulfovibrio spp. can reduce metal ions to form metallic nanoparticles that remain attached to their surfaces. The bioreduction of palladium (Pd) has been given considerable attention due to its extensive use in areas of catalysis and electronics and other technological domains. In this study we report, for the first time, evidence for Pd(II) reduction by the highly corrosive Desulfovibrio ferrophilus IS5 strain to form surface attached Pd nanoparticles, as well as rapid formation of Pd(0) coated microbial nanowires. These filaments reached up to 8 µm in length and led to the formation of a tightly bound group of interconnected cells with enhanced ability to attach to a low carbon steel surface. Moreover, when supplied with high concentrations of Pd (≥ 100 mmol Pd(II) g -1 dry cells), both Desulfovibrio desulfuricans and D. ferrophilus IS5 formed bacteria/Pd hybrid porous microstructures comprising millions of cells. These three-dimensional structures reached up to 3 mm in diameter with a dose of 1200 mmol Pd(II) g -1 dry cells. Under suitable hydrodynamic conditions during reduction, two-dimensional nanosheets of Pd metal were formed that were up to several cm in length. Lower dosing of Pd(II) for promoting rapid synthesis of metal coated nanowires and enhanced attachment of cells onto metal surfaces could improve the efficiency of various biotechnological applications such as microbial fuel cells. Formation of biologically stimulated Pd microstructures could lead to a novel way to produce metal scaffolds or nanosheets for a wide variety of applications.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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