Arsenic and Cadmium Bioremediation by Antarctic Bacteria Capable of Biosynthesizing CdS Fluorescent Nanoparticles
Publication: Journal of Environmental Engineering
Volume 144, Issue 3
Abstract
Use of microorganisms in contaminated water remediation is one of the most studied processes of recent years. The recovery of metal contaminants by converting them into high-value nanomaterials represents a scarcely explored topic with high potential economic impact. In this work, the authors determine the capacity to remove As and Cd from aqueous solutions by Antarctic bacteria previously reported as capable of biosynthesizing CdS fluorescent nanoparticles (NPs) at low temperatures. Bacterial characteristics favoring metal bioremediation, such as As and Cd resistance as well as high biofilm formation and metal removal (kinetic/sorption tests), were determined in Antarctic strains. In addition, the effect of As on the biosynthesis of CdS fluorescent NPs [quantum dots (QDs)] was evaluated. The presence of As inhibits the biosynthesis of CdS QDs by Antarctic bacteria. Arsenic inhibition does not involve the disruption of the Cd nanostructure or a decrease in levels produced by cells, suggesting that As inhibits CdS biosynthesis by avoiding the interaction of with required to produce the nanocrystal. Obtained results have significant consequences for the development of metal bioremediation strategies aimed at removing environmental heavy metals through the generation of NPs.
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Acknowledgments
This research was financed by Programa Binacional de Apoyo a Jóvenes Investigadores Argentina–Chile–2011 (Project ARG-CH 005) and Erika Elcira Donoso Lopez. The authors thank the support received from FONCyT (PIP 3101), SECyT-UNC (05/M265), CONICET (11220100100390CO), Fondecyt 1151255 (JMP-DB), INACH RT-25_16 (JMP-DB), CINV Millenium Initiative 09-022-F (JMP), Nucleo UNAB N° DI-816-15/N (JMP), and AFOSR FA9550-15-1-0140 (JMP). The authors thank ISEA-UNC for the facilities.
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 3 • March 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 19, 2016
Accepted: Jun 20, 2017
Published online: Dec 20, 2017
Published in print: Mar 1, 2018
Discussion open until: May 20, 2018
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