酿酒废酵母吸附Cr^(6+)的动力学及吸附平衡研究

Kinetics and equilibrium of Cr^(6+) biosorption by waste biomass of saccharomyces cerevisia

对酿酒废酵母吸附Cr6+的吸附动力学及等温吸附进行研究,结果表明:当Cr6+初始浓度为30mg/L时,Cr6+在酿酒废酵母上的吸附可分为2个阶段,第1阶段为物理吸附且在5min内达到平衡;Cr6+在酿酒废酵母上的吸附过程可用准二级动力学方程描述,动力学参数k2为0.0174g/(mg·min),qe为4.92mg/g;同时Cr6+在酿酒酵母上的生物吸附也可用Langmuir方程和Freundlich方程来描述,但以Langmuir方程较好,最大吸附量qmax为6.38mg/g,b为0.2331g/(mg·min)。

The biosorption characteristics of Cr6＋by the waste biomass of Saccharomyces cerevisia were investigated,including the biosorption kinetics as well as equilibrium isotherm.The results showed that when the initial Cr6＋concentration was 30mg/L,the process of Cr6＋ biosorption onto the biomass of S.cerevisia could be divided into two stages,the first stage was physical sorption and reached equilibrium very quickly（within 5min）.The biosorption kinetics could be described by the pseudo second-order equation quite well（R2=0.9959）,and the kinetic parameters k2 and qewere 0.0174g/（mg·min）and 4.92mg/g.The equilibrium isotherm could be fitted by the Langmuir and Freundlich models,with the maximum biosorption capacity of 6.38mg/g and b of 0.2331g/（mg·min）.