酿酒酵母吸附Zn^(2+)和Cd^(2+)的动力学

Kinetics of Zn^(2+) and Cd^(2+) biosorption by dried Saccharomyces cerevisia biomass

为了去除废水中的重金属离子,研究用酿酒酵母吸附金属离子Zn2+和Cd2+的生物吸附动力学。实验结果表明,当Zn2+和Cd2+初始浓度为1 mmol/L时,Zn2+和Cd2+在酿酒酵母上的吸附过程进行得很快,在3 h内即可达到吸附平衡。用准二级动力学方程式描述Zn2+和Cd2+在酿酒酵母上的吸附动力学行为(R2>0.99)。经计算得出,酿酒酵母吸附Zn2+和Cd2+的动力学参数k2分别为48 mg/(mg.min)和19mg/(mg.min),平衡吸附量qe分别为6.974 mg/g和12.77mg/g。酿酒酵母废菌体可用于处理低浓度含Cu2+和Cd2+的废水。

Biosorption is a new technology for treating wastewater containing heavy metal contaminants. Tests of the biosorption kinetics of Zn^2＋ and Cd^2＋ by dried Saccharomyces cerevisia hiomass showed that for initial Zn^2＋ and Cd^2＋ concentration of 1 mmol/L, the hiosorption process reached equilibrium very quickly （within 3 h） and the hiosorption process could he well described by pseudo second-order kinetics （R2 〉 0. 99）. For the hiosorption of Zn^2＋ and Cd^2＋, the k2 kinetic parameters were 48 and 19 mg/（mg · min） and the equilibrium sorption capacity （qe） was 6. 974 mg/g and 12. 77 mg/g. The results show that waste Saccharomyces cerevisia hiomass can he used as a hiosorhent to effectively remove Cu^2＋ and Cd^2＋ from wastewater.