三乙烯四胺修饰啤酒废酵母菌吸附Hg(Ⅱ)的性能  

Hg(Ⅱ) Adsorption Behavior of Waste Beer Yeast Modified with Triethylenetetramine

作　　者：夏梦翎[1] 孙小梅[1] 黄冰[1] 李步海[1] 

机构地区：[1]中南民族大学化学与材料科学学院,分析化学国家民委重点实验室,武汉430074

出　　处：《应用化学》2011年第11期1317-1322,共6页Chinese Journal of Applied Chemistry

基　　金：国家民委院校科研基金资助项目(MJY00004)

摘　　要：将三乙烯四胺修饰到戊二醛交联的啤酒废酵母菌表面,合成了一种新的生物吸附剂。研究了它吸附Hg(Ⅱ)的性能及影响吸附行为的因素。结果表明,修饰啤酒废酵母菌吸附Hg(Ⅱ)的适宜条件是:2.5℃,吸附溶液的pH=2.8,吸附平衡时间20 min,对汞的吸附容量为132.6 mg/g,是未修饰菌的6.3倍。该法静态处理含汞模拟废水(4.9～17.5 mg/L),汞去除率可达100%。吸附动力学用准二级方程拟合,相关系数R2=0.999 9。判定Langmuir模型更适合描述吸附Hg(Ⅱ)的过程,表明是单分子层吸附。A new biosorbent from waste beer yeast was prepared by modification with triethylenetetramine and crosslinking with glutaraldehyde.The adsorption capability of the modified yeast for Hg（Ⅱ） in aqueous solution and the influence factors were studied.The results show that the optimized pH value was 2.8 at 25 ℃ and the adsorption process was carried out for 20 min.The maximum uptake capacities for Hg（Ⅱ） is 132.6 mg/g,which is about 6.3 times higher than that of the pristine yeast.With the modified yeast,the average removal rate for Hg（Ⅱ） in the wastewater is 100%.The kinetics for Hg（Ⅱ） adsorption followed the pseudo-second-order with R2=0.999 9.The adsorption process fitted the Langmuir model,indicating that it is a monolayer adsorption process.

关 键 词：三乙烯四胺 啤酒废酵母菌 修饰 吸附 Hg(Ⅱ) 

分 类 号：O652.6[理学—分析化学]