TY - JOUR
T1 - XAS investigations into the mechanism(s) of Au(III) binding and
reduction by alfalfa biomass
AU - Gardea-Torresdey, JL
AU - Tiemann, KJ
AU - Parsons, JG
AU - Gamez Goytia, Gerardo
AU - Herrera, I
AU - Jose-Yacaman, M
PY - 2002/4
Y1 - 2002/4
N2 - Previous experiments showed that inactivated alfalfa biomass is
proficient in the recovery of gold(III) from aqueous solutions.
Gold(III) binding to alfalfa biomass is rapid, pH independent, and
increases with temperature. Also, X-ray absorption spectroscopy studies
showed that alfalfa was able to reduce gold(III) to gold(0), producing
nano-particles. This current study was performed to gain a better
understanding of the interaction between gold(Ill) and the alfalfa
biomass. Through chloride ion release studies, it was found that three
moles of Cl- were released per mole of gold adsorbed. Chemical
modification of the alfalfa biomass indicated that both amino and
carboxyl functional groups on the alfalfa biomass are involved in the
reduction process. Finally, X-ray absorption near edge structure (XANES)
and extended X-ray absorption fine structure (EXAFS) spectroscopy
studies suggested that gold(III)is initially reduced to gold(I) and is
eventually reduced to gold(0); in addition, the
AB - Previous experiments showed that inactivated alfalfa biomass is
proficient in the recovery of gold(III) from aqueous solutions.
Gold(III) binding to alfalfa biomass is rapid, pH independent, and
increases with temperature. Also, X-ray absorption spectroscopy studies
showed that alfalfa was able to reduce gold(III) to gold(0), producing
nano-particles. This current study was performed to gain a better
understanding of the interaction between gold(Ill) and the alfalfa
biomass. Through chloride ion release studies, it was found that three
moles of Cl- were released per mole of gold adsorbed. Chemical
modification of the alfalfa biomass indicated that both amino and
carboxyl functional groups on the alfalfa biomass are involved in the
reduction process. Finally, X-ray absorption near edge structure (XANES)
and extended X-ray absorption fine structure (EXAFS) spectroscopy
studies suggested that gold(III)is initially reduced to gold(I) and is
eventually reduced to gold(0); in addition, the
M3 - Article
SP - 193
EP - 204
JO - MICROCHEMICAL JOURNAL
JF - MICROCHEMICAL JOURNAL
ER -