固定化改性酿酒废酵母吸附Pb^(2+)特性研究

Characteristics of Pb^(2+) biosorption by immobilized modified waste Saccharomyces cerevisiae

通过静态吸附试验,以固定化改性酿酒废酵母为吸附剂,研究其对Pb2+的吸附特性。研究结果表明:固定化改性酿酒废酵母对Pb2+的吸附在60 min时达到吸附平衡,吸附量随Pb2+初始质量浓度的增加而增大,最佳吸附温度为30℃,最佳pH值为4.5,最佳改性酿酒废酵母小球质量浓度为22g/L,并且可以用准二级动力学方程和Langmuir方程对固定化酿酒废酵母吸附的动力学及吸附平衡进行描述。

The Pb^2＋ biosorption characteristics by immobilized modified waste Saccharomyces cerevisiae were studied using static adsorption experiment. The experimental results indicated that the adsorption of Pb2＋by the immobilized cells reached equilibrium at the 60 min, and the adsorption capacity increased with the increase of initial Pb^2＋ concentration. The optimum adsorption condition was temperature 30 ℃, pH 4.5, immobilized waste S. cerevisiae cells concentration 22 g/L. The Pseudo-second order kinetics and Langmuir adsorption equation can be used to describe immobilized modified waste S. cerevisiae adsorption kinetics and Pb2＋adsorption equilibrium.