Abstract: Saccharomyces cerevisiae was entrapped in a mixture of 2% SA，and 4%CaCl₂. The mechanical strength of SA-CaCl₂ immobilized beads，and the effects of adsorption treatment conditions，such as pH，temperature，Sr²⁺ initial concentration and reaction time，on the adsorptive capacity were investigated. The results show that the mechanical strength of immobilized Saccharomyces cerevisiae is higher at 10% Saccharomyces cerevisiae，the optimal adsorption condition for immobilized Saccharomyces cerevisiae is as follows：pH 4.5，temperature 30 ℃，Sr²⁺ initial concentration 50 mg/L，adsorption time 4 h. The sorption process of Sr²⁺ is in accordance with both Langmuir and Freundlich isotherm when the concentration of Sr²⁺ is 10—150 mg/L，but complies with Freundlich model better.

Key words: Saccharomyces cerevisiae, immobilized cell, Sr²⁺, biosorption

摘要： 用2%海藻酸钠（SA），4%氯化钙（CaCl₂）包埋法制备了固定啤酒废酵母。考察了菌体含量对固定化菌体强度的影响，研究了pH值、温度、Sr²⁺初始浓度、吸附时间等外界因素对固定化啤酒酵母吸附溶液中Sr²⁺的影响。结果表明：菌体含量为10%时，制备的固定化菌体具有较好的机械强度。固定化啤酒废酵母对Sr²⁺最佳吸附条件为：pH=4.5，温度30 ℃，Sr²⁺起始浓度50 mg/L，吸附时间4 h。Sr²⁺浓度在10～150 mg/L范围内，固定化啤酒废酵母对Sr²⁺的吸附符合Langmuir模型和Freundlich模型，但符合Freundlich模型的程度更优。

关键词: 啤酒酵母菌, 固定化, Sr²⁺, 生物吸附