Biorecovery of gold by Escherichia coli and Desulfovibrio desulfuricans.
Biotechnol Bioeng
; 99(5): 1055-64, 2008 Apr 01.
Article
em En
| MEDLINE
| ID: mdl-17969152
ABSTRACT
Microbial precipitation of gold was achieved using Escherichia coli and Desulfovibrio desulfuricans provided with H2 as the electron donor. No precipitation was observed using H2 alone or with heat-killed cells. Reduction of aqueous AuIII ions by both strains was demonstrated at pH 7 using 2 mM HAuCl4 solution and the concept was successfully applied to recover 100% of the gold from acidic leachate (115 ppm of AuIII) obtained from jewelry waste. Bioreductive recovery of gold from aqueous solution was achieved within 2 h, giving crystalline Au0 particles (20-50 nm), in the periplasmic space and on the cell surface, and small intracellular nanoparticles. The nanoparticle size was smaller (red suspension) at acidic pH (2.0) as compared to that obtained at pH 6.0 and 7.0 (purple) and 9.0 (dark blue). Comparable nanoparticles were obtained from AuIII test solutions and jewelry leachate.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Desulfovibrio desulfuricans
/
Escherichia coli
/
Ouro
Idioma:
En
Revista:
Biotechnol Bioeng
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Reino Unido