固定化酿酒废酵母吸附Pb^(2+)的动力学及等温吸附研究

Kinetics and equilibrium of Pb^(2+) biosorption by waste biomass of saccharomyces cerevisia

将酿酒废酵母包埋制成固定化小球,研究其对Pb2+的吸附动力学和吸附等温线。吸附动力学结果表明,当Pb2+初始浓度为20mg/L时,固定化酿酒酵母对Pb2+的吸附在3h即达到平衡。Pb2+在固定化酿酒废酵母上的吸附过程可用准二级动力学方程来描述(R2=0.999 4),动力学参数k2为0.002 9g/(mg.min),qe为18.12mg/g。吸附等温线结果表明,Pb2+在酿酒酵母上的生物吸附可以用Langmuir和Freundlich方程来描述,但以Langmuir方程较好(R2=0.995 7),qmax为18.69mg/g,b=0.127 2g/(mg.min)。

The biosorption characteristics of Pb2＋ by the waste biomass of Saccharomyces cerevisia were investigated,including the biosorption kinetics as well as equilibrium isotherm study.The experimental results showed that when the initial Pb2＋ concentration was 20 mg/L,the process of Pb2＋ biosorption reached equilibrium with 3 h.The biosorption kinetics could be described by the pseudo second-order equation quite well（R2=0.999 4）,and the kinetic parameters k2 and qewere 0.002 9 g/（mg·min） and 18.12 mg/g,respectively.The equilibrium isotherm could be fitted by the Langmuir and Freundlich models,but the Langmuir model is better（R2=0.995 7）,with the maximum biosorption capacity and b were 18.69 mg/g and 0.127 2 g/（mg·min）.