Kinetics and Equilibrium of Ni2+ Biosorption by Waste Biomass of Saccharomyces cerevisia
Ni2+生物吸附动力学及吸附平衡研究

The biosorption characteristics of Ni2+ by the waste biomass of Saccharomyces cerevisia was investigated, including the biosorption kinetics as well as equilibrium isotherm study. The experimental results showed that when the initial Ni2+ concentration was 65.6 mg/L, the process of Ni2+ biosorption onto the biomass of Saccharomyces cerevisia could be divided into two stages, the first stage was physical sorption and reached equilibrium very quickly (within 10 minutes). The biosorption kinetics could be described by the pseudo second-order equation quite well (R2=0.999), the kinetic parameters k2 and qe were 0.0184 g/(mg?min) and 5.96 mg/g, respectively. The equilibrium isotherm could be fitted by the Langmuir and Freundlich models, with the maximum biosorption capacity of 6.32 mg/g. The removal of Ni2+ from wastewater by biosorption is feasible.