Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 61, Issue 4, Pages 761-765Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2004.03.029
Keywords
biosorption; Saccharomyces cerevisiae; waste biomass; AU(3+); bioreduction; gold nanoparticle; FTIR
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Some spectroscopic characteristics of Au3+ biosorption by waste biomass of Saccharomyces cerevisiae have been reported in this paper. The effect of temperature on the correlation parameters of chemical kinetics and thermodynamics of the binding reaction was investigated by using AAS. XRD diffraction pattern of gold-loaded biomass revealed that the Au3+ bound on the cell wall of the biomass had been reduced into gold particle. FTIR spectrophotometry on blank and gold-loaded biomass demonstrated that active groups such as the hydroxyl group of saccharides, and the carboxylate anion of amino-acid residues, from the peptidoglycan layer on the cell wall seem to be the sites for the Au3+ binding, and the free aldehyde group of the hemiacetalic hydroxyl group from reducing sugars, i.e. the hydrolysates of the polysaccharides on the peptidoglycan layer, serving as the electron donor, in situ reduced the Au3+ to Au-0. XPS and IR characterizations of the interaction between glucose and Au3+ further supported that the reduction of An(3+) to Au-0 can directly occur at the aldehyde group of the reducing sugars. (C) 2004 Elsevier B.V. All rights reserved.
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