啤酒酵母废菌体Au3+的透射电镜观察

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200 μg/ml,菌体浓度2mg/ml, pH3.0和30℃的条件下, 吸附60min,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-Fe2O3和SiO2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.

Transmission electron microscopic observation of Au3+ biosorption by Saccharomyces cerevisiae waste biomass

The biosorption and bioreduction of Au3+ by waste biomass of Saccharomyces cerevisiae are reported. The biosorptive capacity of the biomass could reach 55.9 mg/g under the conditions of 200 μg Au3+/ml,2 mg biomass/ml, pH 3.0 and 30 ℃ for 60 min of contact. The observation in the transmission electron microscope (TEM) showed that the Au3+ ions in the solution could be adsorbed and reduced to Au0 by S. cerevisiae waste biomass. The Au0 could become gold crystals of different sizes and forms. Au3+ ions adsorbed on the α-Fe2O3 and SiO2 could be reduced to Au particles of nanometer size.