Zn^(2+)和Cd^(2+)在酿酒酵母上的生物吸附平衡

BIOSORPTION EQUILIBRIUM OF Zn^(2+) AND Cd^(2+) ONTO WASTE BIOMASS OF SACCHAROMYCES CEREVISIA

研究了金属离子Zn2+和Cd2+在酿酒酵母上的生物吸附平衡。吸附等温线表明,Zn2+和Cd2+在酵母上的吸附可以用Langmuir方程来描述,Zn2+的最大吸附量qmax为9.66mg/g(0.148mmol/g),Cd2+的最大吸附量qmax为15.36mg/g(0.137mmol/g)。当q以mg/g为单位时,两者在酵母上的吸附量大小顺序为Cd2+>Zn2+。与Cd2+比较,Zn2+在酵母上的吸附力更强,更容易被酵母吸附。酵母作为生物吸附剂可用于处理含Zn2+和Cd2+的废水,适合用于溶液中低浓度Zn2+和Cd2+的去除。

The biosorption ofZn^2＋ and Cd^2＋ onto the waste biomass of brewery （Saccharomyces cerevisia） was investigated. In particular, the comparative analysis on equilibrium sorption of metal ions was made. The experimental results indicated that the biosorption ofZn^2＋ and Cd^2＋ could reach equilibrium very quickly, and the sorption process could be described by Langmuir isotherm model. The maximum sorption capacity （qmax） ofZn^2＋ and Cd^2＋ was 9.66mg/g and 15.36rag/g, respectively. When qmax was expressed in the unit of mg/g, the qmax was in the following order： Cd^2＋〉Zn^2＋. In comparison with Cd^2＋, biosorption of Zn^2＋onto the cells ofSaccharomyces cerevisia is easier. The removal of Cu^2＋ and Cd^2＋ from wastewater by using waste biomass of Saecharomyces cerevisia as biosorbent is feasible.