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Mechanisms of Gold Bioaccumulation by Filamentous Cyanobacteria from Gold(III) - Chloride Complex.
- Source :
-
Environmental Science & Technology . 10/15/2006, Vol. 40 Issue 20, p6304-6309. 6p. 1 Diagram, 1 Chart, 2 Graphs. - Publication Year :
- 2006
-
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 7.8 mM) at 25 °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 (∼10 nm to 6 μm) 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0013936X
- Volume :
- 40
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- Environmental Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 23189491
- Full Text :
- https://doi.org/10.1021/es061040r