摘要
用废啤酒酵母吸附水溶液中Cu^2＋，考察了溶液pH值、Cu^2＋浓度和吸附时间对Cu^2＋吸附的影响。结果表明：废啤酒酵母吸附Cu^2＋在4～6h内达到吸附平衡，酸性条件利于吸附，以pH为5时最佳，吸附等温曲线符合Langmuir模式。用电位滴定及FTIR分析的方法确定生物吸附剂主要含有磺酸基、羧基及氨基等功能团。生物吸附剂对Cu^2＋的吸附以单分子层的化学吸附为主，功能团在不同的pH条件下呈现不同的电离性能，在吸附过程中发挥重要作用。
Saccharomyces cerevisiae was used experimental parameters （ e. g. equilibrium pH, biosorption of Cu^2＋ by Saccharomyces cerevisiae as a new type of biosorbent for the removal of copper. Various contact time, Cu^2＋ concentration ） were investigated. The is a quick process which only need 4 -6h to reach the equilibrium, and the optimum pH is 5. The results indicated that Langmuir isotherm sorption model fitted well the isotherm adsorption of copper. Sulfonate, carboxyl and amine groups were present in the biosorbent, which was confirmed by FTIR and proton-binding model. Chemical sorption was dominated in the binding of its molecules. Different functional groups were ionized in different pH conditions and played a pronounced role in the sorption.
出处
《中国生物工程杂志》
CAS
CSCD
北大核心
2008年第3期64-68,共5页
China Biotechnology
基金
国家自然科学基金(20577070)
教育部留学回国人员科研启动基金(YZZ05019)资助项目
关键词
生物吸附
废啤酒酵母
CU^2+
官能团
Biosorption Saccharomyces cerevisiae Cu^2＋ Functional groups
