Transmission electron microscopic observationof Au^(3+) biosorption by Saccharomycescerevisiae waste biomass  

作　　者：LIU Yue-ying 1 FU Jin-kun 2 LUO Xue-feng 1 NI Zi-mian 3 CHEN Ping 3 YU Xin-sheng 2 ( 1 Department of Biology, 2 Department of Chemistry, 3 Centre of Analysis & Testing, Xiamen University, Xiamen 361005, P. R. China) 

出　　处：《电子显微学报》2000年第5期695-698,共4页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目 !(2 97430 0 1;2 98760 2 6)

摘　　要：本文报告啤酒酵母废菌体对 Au3 +的吸附还原作用。该菌体在金离子起始浓度 2 0 0μg/ ml,菌体浓度2 mg/ ml,p H3 .0和 3 0℃的条件下 ,吸附 60 min,吸附量达 55.9mg/ g干菌体。 TEM观察结果表明 ,溶液中的Au3 +离子能被啤酒酵母废菌体吸附 ,并还原生成 Au0 颗粒。所生成的 Au0 颗粒能形成不同形状和大小的金晶体。吸附在 α- Fe2 O3 和 Si O2 上的 Au3 +离子也能被啤酒酵母废菌体还原形成纳米大小的金颗粒。The biosorption and bioreduction of Au 3+ by waste biomass of Sacc haromy ces cerevisiae are reported. The biosorptive capacity of the biomass could re ac h 55.9 mg/g under the conditions of 200 μg Au 3+ /ml, 2 mg biomass/ml, pH 3 . 0 and 30 ℃ for 60 min of contact. The observation in the transmission electron microsco pe (TEM) showed that the Au 3+ ions in the solution could be adsorbed and r educed to Au 0 by S. cerevisiae waste biomass. The Au 0 could become gold crysta ls of di fferent sizes and forms. Au 3+ ions adsorbed on the α-Fe 2O 3 and SiO 2 could be reduced to Au particles of nanometer size.

关 键 词：TEM 啤酒 酵母废菌体 金离子 吸附还原作用 

分 类 号：TG115[金属学及工艺—物理冶金]