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Mechanisms of Gold Bioaccumulation by Filamentous Cyanobacteria from Gold(III)−Chloride Complex
Abstract
The mechanisms of gold bioaccumulation by cyanobacteria (Plectonema boryanum UTEX 485) from gold(III)-chloride solutions have been studied at three gold concentrations (0.8,1.7, and 7.6 mM) at 25 degrees C, using both fixed-time laboratory and real-time synchrotron radiation absorption spectroscopy (XAS) experiments. Interaction of cyanobacteria with aqueous gold(III)-chloride initially promoted the precipitation of nanoparticles of amorphous gold(I)-sulfide at the cell walls, and finally deposited metallic gold in the form of octahedral (111) platelets (approximately 10 nm to 6 microm) near cell surfaces and in solutions. The XAS results confirm that the reduction mechanism of gold(III)-chloride to metallic gold by cyanobacteria involves the formation of an intermediate Au(I) species, gold(I)-sulfide.
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Metadata
- Authors
- Lengke, M. F., Ravel, B., Fleet, M. E., Wanger, G., Gordon, R. A., & Southam, G.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2006-09-09
- Volume
- 40
- Issue
- 20
- Pages
- 6304-6309
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1966412956
- Cited by
- 314
- References
- 23
- FWCI
- 5.12
- Type
- journal article
- Language
- en
- Open access
- closed
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