【摘要】 用废啤酒酵母吸附水溶液中Cu2+,考察了溶液pH值、Cu2+浓度和吸附时间对Cu2+吸附的影响。结果表明:废啤酒酵母吸附Cu2+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Cu2+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。更多还原

【Abstract】 Saccharomyces cerevisiae was used as a new type of biosorbent for the removal of copper. Various experimental parameters (e.g. equilibrium pH, contact time, Cu2+ concentration) were investigated. The biosorption of Cu2+ by Saccharomyces cerevisiae 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.更多还原