改性壳聚糖对Ag^+的吸附性能研究  

Study on the adsorption behavior of Ag^+ by modified chitosan

作　　者：李爱阳[1] 

机构地区：[1]湖南工学院化工系

出　　处：《黄金》2009年第1期50-53,共4页Gold

基　　金：湖南省自然科学基金项目(08JJ3015);湖南省教育厅科研计划项目(07C030);衡阳市工业科研开发计划项目(06KG59)

摘　　要：利用壳聚糖与氯丙酸反应,制备了改性壳聚糖,并研究了改性壳聚糖对Ag+的吸附性能。试验结果表明,在pH值为4~6,吸附时间为240min,温度为40℃,氯丙酸-壳聚糖对Ag+的吸附率达到95%以上。通过运用相关数学模型对试验数据进行拟合表明,氯丙酸-壳聚糖对Ag+的吸附符合Langmuir和Freundlich等温方程式,最大吸附量为216.9197mg/g,吸附过程符合一级动力学方程。In the paper, an efficient procedure to modify chitosan was carried out by the reaction of chloropropionic acid and chitosan. The adsorption behavior of Ag^＋ by modified ehitosan was investigated. On the condition of pH value 4 -6, adsorption time 240rain and temperature 40℃the adsorption rates of Ag^＋ was up to 95% by chloropropionic acid-chitosan. The experimental data were fit with related mathematic models, and the isotherm adsorption equilibrium fit Langmuir model and Freundlich model. The largest adsorption quantity Qmax is 216. 919 7rag/g, n is 2. 687 4, the R2 values are respectively 0.997 3 and 0.986 6. The adsorption process kinetics accords to the first - order equation.

关 键 词：壳聚糖 吸附性能 动力学 热力学 

分 类 号：O647.31[理学—物理化学]