Spectroscopic characterization of Au3+ biosorption by waste biomass of Saccharomyces cerevisiae
Spectroscopic characterization of Au3+ biosorption by waste biomass of Saccharomyces cerevisiae
复制标题
DOI：
10.1016/j.saa.2004.03.029
复制
发表时间：
2005-02-01
影响因子：
4.4
通讯作者：
Yang, Y
中科院分区：
文献类型：
--
作者：
Lin, ZY;Wu, JM;Yang, Y
本文报道了酿酒酵母废弃生物质对 Au3+ 生物吸附的一些光谱特征。利用原子吸收光谱法研究了温度对结合反应化学动力学和热力学相关参数的影响。载金生物质的 XRD 衍射图表明，生物质细胞壁上结合的 Au3+ 已被还原成金颗粒。对空白和载金生物质进行 FTIR 分光光度分析表明，细胞壁肽聚糖层上的糖类羟基和氨基酸残基的羧酸根阴离子等活性基团似乎是 Au3+ 结合的位点，而还原糖（即肽聚糖层上多糖的水解产物）的半缩醛羟基的游离醛基则充当电子供体，原位将 Au3+ 还原为 Au-0。葡萄糖和 Au3+ 之间相互作用的 XPS 和 IR 表征进一步支持 An(3+) 还原成 Au-0 可以直接发生在还原糖的醛基上。 (C) 2004 Elsevier B.V. 保留所有权利。
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.