XAS investigations into the mechanism(s) of Au(III) binding and reduction by alfalfa biomass

J. L. Gardea-Torresdey; K. J. Tiemann; J. G. Parsons; G. Gamez; I. Herrera; M. Jose-Yacaman

doi:10.1016/S0026-265X(02)00011-5

XAS investigations into the mechanism(s) of Au(III) binding and reduction by alfalfa biomass

J. L. Gardea-Torresdey, K. J. Tiemann, J. G. Parsons, G. Gamez, I. Herrera, M. Jose-Yacaman

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

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(III) 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 X-ray spectroscopic studies indicated that binding may be occurring through a nitrogen or oxygen ligand.

Original language	English (US)
Pages (from-to)	193-204
Number of pages	12
Journal	Microchemical Journal
Volume	71
Issue number	2-3
DOIs	https://doi.org/10.1016/S0026-265X(02)00011-5
State	Published - 2002
Externally published	Yes

Keywords

Alfalfa
Chemical modification
EXAFS
Gold
Metal binding
Phytofiltration
XANES

ASJC Scopus subject areas

Analytical Chemistry
Spectroscopy

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10.1016/S0026-265X(02)00011-5

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@article{fd97c53932bd47888c349a8956638d84,

title = "XAS investigations into the mechanism(s) of Au(III) binding and reduction by alfalfa biomass",

abstract = "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(III) 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 X-ray spectroscopic studies indicated that binding may be occurring through a nitrogen or oxygen ligand.",

keywords = "Alfalfa, Chemical modification, EXAFS, Gold, Metal binding, Phytofiltration, XANES",

author = "Gardea-Torresdey, {J. L.} and Tiemann, {K. J.} and Parsons, {J. G.} and G. Gamez and I. Herrera and M. Jose-Yacaman",

note = "Funding Information: The authors acknowledge the financial support of the Science To Achieve Results (STAR) Fellowship (U-91558301-1) through the Environmental Protection Agency (EPA) and the National Institutes of Health (NIH) (Grant S06GM8012-30). We also acknowledge financial support from the University of Texas at El Paso (UTEP) Center for Environmental Resource Management (CERM) through funding from the Office of Exploratory Research of the EPA (Cooperative Agreement CR-819849-01-4). We also acknowledge the HBCU/MI Environmental Technology Consortium, which is funded by the Department of Energy. Portions of this research were carried out at the Stanford Synchrotron Radiation Laboratory (SSRL): a national user facility operated by Stanford University on behalf of the US Department on Energy (DOE), Office of Basic Emergy Sciences. The SSRL Structural Molecular Biology Program is supported by The DOE, Office of Biological and Environmental Research, and by the NIH, National Center for Research Resources, Biomedical Technology Program. In addition, the authors would like to acknowledge the SSRL/DOE funded Gateway Program.",

year = "2002",

doi = "10.1016/S0026-265X(02)00011-5",

language = "English (US)",

volume = "71",

pages = "193--204",

journal = "Microchemical Journal",

issn = "0026-265X",

publisher = "Elsevier Inc.",

number = "2-3",

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TY - JOUR

T1 - XAS investigations into the mechanism(s) of Au(III) binding and reduction by alfalfa biomass

AU - Gardea-Torresdey, J. L.

AU - Tiemann, K. J.

AU - Parsons, J. G.

AU - Gamez, G.

AU - Herrera, I.

AU - Jose-Yacaman, M.

N1 - Funding Information: The authors acknowledge the financial support of the Science To Achieve Results (STAR) Fellowship (U-91558301-1) through the Environmental Protection Agency (EPA) and the National Institutes of Health (NIH) (Grant S06GM8012-30). We also acknowledge financial support from the University of Texas at El Paso (UTEP) Center for Environmental Resource Management (CERM) through funding from the Office of Exploratory Research of the EPA (Cooperative Agreement CR-819849-01-4). We also acknowledge the HBCU/MI Environmental Technology Consortium, which is funded by the Department of Energy. Portions of this research were carried out at the Stanford Synchrotron Radiation Laboratory (SSRL): a national user facility operated by Stanford University on behalf of the US Department on Energy (DOE), Office of Basic Emergy Sciences. The SSRL Structural Molecular Biology Program is supported by The DOE, Office of Biological and Environmental Research, and by the NIH, National Center for Research Resources, Biomedical Technology Program. In addition, the authors would like to acknowledge the SSRL/DOE funded Gateway Program.

PY - 2002

Y1 - 2002

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(III) 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 X-ray spectroscopic studies indicated that binding may be occurring through a nitrogen or oxygen ligand.

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(III) 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 X-ray spectroscopic studies indicated that binding may be occurring through a nitrogen or oxygen ligand.

KW - Alfalfa

KW - Chemical modification

KW - EXAFS

KW - Gold

KW - Metal binding

KW - Phytofiltration

KW - XANES

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U2 - 10.1016/S0026-265X(02)00011-5

DO - 10.1016/S0026-265X(02)00011-5

M3 - Article

AN - SCOPUS:0036220764

SN - 0026-265X

VL - 71

SP - 193

EP - 204

JO - Microchemical Journal

JF - Microchemical Journal

IS - 2-3

ER -

XAS investigations into the mechanism(s) of Au(III) binding and reduction by alfalfa biomass

Abstract

Keywords

ASJC Scopus subject areas

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