Properties and characterization of Au^(3+)-adsorption by mycelial waste of Streptomyces aureofaciences

作     者：LIU Yueying, FU Jinkun, HU Hongbo, TANG Dingliang, Nl Zimian & YU Xinsheng1. Department of Biology, 2. State Key Laboratory for Physical Chemistry of Solid Surface, 3. Center for Analysis & Testing, Xiamen University, Xiamen 361005, China 

作者机构：Department of Biology Xiamen University Xiamen China State Key Laboratory for Physical Chemistry of Solid Surface Xiamen University Xiamen China Center for Analysis & Testing Xiamen University Xiamen China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2001年第46卷第20期

页      面：1709-1712页

核心收录：

学科分类：0710[理学-生物学] 1007[医学-药学(可授医学、理学学位)] 100705[医学-微生物与生化药学] 07[理学] 071005[理学-微生物学] 10[医学] 

基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 29876026 and 29743001) 

主　　题：Streptomyces aureofaciences mycelial waste gold bio-sorption gold crystal characterization. 

摘      要：Mycelial waste of Streptomyces aureofaciences procured from the aureomycin fermentation industry is used as biosorbent for Au3+. The properties of Au3+ adsorption by the mycelial waste are studied. The results indicate that the optimum pH value of Au3+ adsorption is 3.5. The biosorption is a rapid and non-temperature-dependent process. The bio-sorptive capacity with 45.6 mg/g and efficiency with 91.2% are achieved under the conditions of pH 3.5 and 30℃ for 45 min, in which the ratio is 50 mg/g dry weight for the concentrations of initial Au3+ and the mycelial waste. The Au3+ ions adsorbed on the mycelial waste can be eluted. The observation in a transmission electron microscope shows that the Au3+ ions can be reduced to Au particles by the mycelial waste and the Au can become gold crystals with differentforms and sizes. X-ray photoelectron spectroscopy analysis further proves that the Au3+ can be reduced to Au0 by the mycelial waste.