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Biological recovery of platinum complexes from diluted aqueous streams by axenic cultures

Synthia Maes (UGent), Ruben Props (UGent), Jeffrey P Fitts, Rebecca De Smet (UGent), Frank Vanhaecke (UGent), Nico Boon (UGent) and Tom Hennebel (UGent)
(2017) PLOS ONE. 12(1).
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Abstract
The widespread use of platinum in high-tech and catalytic applications has led to the production of diverse Pt loaded wastewaters. Effective recovery strategies are needed for the treatment of low concentrated waste streams to prevent pollution and to stimulate recovery of this precious resource. The biological recovery of five common environmental Pt-complexes was studied under acidic conditions; the chloro-complexes PtCl42- and PtCl62-, the amine-complex Pt(NH3)(4)Cl-2 and the pharmaceutical complexes cisplatin and carboplatin. Five bacterial species were screened on their platinum recovery potential; the Gram-negative species Shewanella oneidensis MR-1, Cupriavidus metallidurans CH34, Geobacter metallireducens, and Pseudomonas stutzeri, and the Gram-positive species Bacillus toyonensis. Overall, PtCl42- and PtCl62- were completely recovered by all bacterial species while only S. oneidensis and C. metallidurans were able to recover cisplatin quantitatively (99%), all in the presence of H-2 as electron donor at pH 2. Carboplatin was only partly recovered (max. 25% at pH 7), whereas no recovery was observed in the case of the Pt-tetraamine complex. Transmission electron microscopy (TEM) revealed the presence of both intra- and extracellular platinum particles. Flow cytometry based microbial viability assessment demonstrated the decrease in number of intact bacterial cells during platinum reduction and indicated C. metallidurans to be the most resistant species. This study showed the effective and complete biological recovery of three common Pt-complexes, and estimated the fate and transport of the Pt-complexes in wastewater treatment plants and the natural environment.
Keywords
SULFATE-REDUCING BACTERIA, PRECIOUS METALS, BIOREDUCTIVE DEPOSITION, HALOPHILIC BACTERIA, FLOW-CYTOMETRY, WASTE-WATER, NANOPARTICLES, PALLADIUM, REDUCTION, ENVIRONMENTS

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Chicago
Maes, Synthia, Ruben Props, Jeffrey P Fitts, Rebecca De Smet, Frank Vanhaecke, Nico Boon, and Tom Hennebel. 2017. “Biological Recovery of Platinum Complexes from Diluted Aqueous Streams by Axenic Cultures.” Plos One 12 (1).
APA
Maes, Synthia, Props, R., Fitts, J. P., De Smet, R., Vanhaecke, F., Boon, N., & Hennebel, T. (2017). Biological recovery of platinum complexes from diluted aqueous streams by axenic cultures. PLOS ONE, 12(1).
Vancouver
1.
Maes S, Props R, Fitts JP, De Smet R, Vanhaecke F, Boon N, et al. Biological recovery of platinum complexes from diluted aqueous streams by axenic cultures. PLOS ONE. 2017;12(1).
MLA
Maes, Synthia, Ruben Props, Jeffrey P Fitts, et al. “Biological Recovery of Platinum Complexes from Diluted Aqueous Streams by Axenic Cultures.” PLOS ONE 12.1 (2017): n. pag. Print.
@article{8502844,
  abstract     = {The widespread use of platinum in high-tech and catalytic applications has led to the production of diverse Pt loaded wastewaters. Effective recovery strategies are needed for the treatment of low concentrated waste streams to prevent pollution and to stimulate recovery of this precious resource. The biological recovery of five common environmental Pt-complexes was studied under acidic conditions; the chloro-complexes PtCl42- and PtCl62-, the amine-complex Pt(NH3)(4)Cl-2 and the pharmaceutical complexes cisplatin and carboplatin. Five bacterial species were screened on their platinum recovery potential; the Gram-negative species Shewanella oneidensis MR-1, Cupriavidus metallidurans CH34, Geobacter metallireducens, and Pseudomonas stutzeri, and the Gram-positive species Bacillus toyonensis. Overall, PtCl42- and PtCl62- were completely recovered by all bacterial species while only S. oneidensis and C. metallidurans were able to recover cisplatin quantitatively (99\%), all in the presence of H-2 as electron donor at pH 2. Carboplatin was only partly recovered (max. 25\% at pH 7), whereas no recovery was observed in the case of the Pt-tetraamine complex. Transmission electron microscopy (TEM) revealed the presence of both intra- and extracellular platinum particles. Flow cytometry based microbial viability assessment demonstrated the decrease in number of intact bacterial cells during platinum reduction and indicated C. metallidurans to be the most resistant species. This study showed the effective and complete biological recovery of three common Pt-complexes, and estimated the fate and transport of the Pt-complexes in wastewater treatment plants and the natural environment.},
  articleno    = {e0169093},
  author       = {Maes, Synthia and Props, Ruben and Fitts, Jeffrey P and De Smet, Rebecca and Vanhaecke, Frank and Boon, Nico and Hennebel, Tom},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  keyword      = {SULFATE-REDUCING BACTERIA,PRECIOUS METALS,BIOREDUCTIVE DEPOSITION,HALOPHILIC BACTERIA,FLOW-CYTOMETRY,WASTE-WATER,NANOPARTICLES,PALLADIUM,REDUCTION,ENVIRONMENTS},
  language     = {eng},
  number       = {1},
  pages        = {17},
  title        = {Biological recovery of platinum complexes from diluted aqueous streams by axenic cultures},
  url          = {http://dx.doi.org/10.1371/journal.pone.0169093},
  volume       = {12},
  year         = {2017},
}

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