Reduction and accumulation of gold(III) by Medicago sativa alfalfa biomass: X-ray absorption spectroscopy, pH, and temperature dependence

J. L. Gardea-Torresdey, K. J. Tiemann, G. Gamez, K. Dokken, Irene Cano-Aguilera, Lars R Furenlid, Mark W. Renner

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

We report herein the use of Modicago sativa alfalfa shoot biomass for the removal of gold from aqueous solutions. The accumulation process involves the reduction of Au(III) to colloidal Au(0) and is shown to increase at elevated temperatures and at lower pH. X-ray absorption spectroscopy (XAS) was used to determine that gold(III) was reduced to form gold(0) colloids, which varied in size depending on the PH of the initial solution. The gold cluster radius was 6.2 ± 1 Å at pH 5 and 9.0 ± 1 Å at pH 2. Our findings indicate that essentially another layer of gold atoms was deposited onto the colloid surface at pH 2. Possible mechanisms of bioreduction and accumulation are discussed.

Original languageEnglish (US)
Pages (from-to)4392-4396
Number of pages5
JournalEnvironmental Science and Technology
Volume34
Issue number20
DOIs
StatePublished - Oct 15 2000

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X ray absorption spectroscopy
atomic absorption spectroscopy
alfalfa
Gold
X-ray spectroscopy
Biomass
gold
biomass
Colloids
colloid
temperature
Temperature
aqueous solution
shoot
Atoms

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Reduction and accumulation of gold(III) by Medicago sativa alfalfa biomass : X-ray absorption spectroscopy, pH, and temperature dependence. / Gardea-Torresdey, J. L.; Tiemann, K. J.; Gamez, G.; Dokken, K.; Cano-Aguilera, Irene; Furenlid, Lars R; Renner, Mark W.

In: Environmental Science and Technology, Vol. 34, No. 20, 15.10.2000, p. 4392-4396.

Research output: Contribution to journalArticle

Gardea-Torresdey, J. L. ; Tiemann, K. J. ; Gamez, G. ; Dokken, K. ; Cano-Aguilera, Irene ; Furenlid, Lars R ; Renner, Mark W. / Reduction and accumulation of gold(III) by Medicago sativa alfalfa biomass : X-ray absorption spectroscopy, pH, and temperature dependence. In: Environmental Science and Technology. 2000 ; Vol. 34, No. 20. pp. 4392-4396.
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AU - Furenlid, Lars R

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