累托石-壳聚糖吸附剂对Cd^2＋的吸附作用研究  

Study on the adsorption of Cd^(2+) with rectorite/chitosan absorbent

作　　者：李爱阳[1] 蔡玲[1,2] 蒋美丽[1] 

机构地区：[1]湖南工学院化工系,湖南衡阳421002 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《化学研究与应用》2009年第5期660-664,共5页Chemical Research and Application

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：利用累托石负载壳聚糖制备一种复合吸附剂,并对其结构进行了表征。研究了复合吸附剂对Cd2+的吸附,应用正交试验确定了最佳吸附条件:当pH值为7,吸附时间为30min,投加量为0.3g和温度为20℃时,Cd2+的吸附率达99%以上,处理后的水符合国家污水综合排放标准(GB8978—1996)中的一级标准。通过对实验数据运用相关数学模型拟合,复合吸附剂对Cd2+的吸附符合Langmuir和Freundlich吸附等温式。In the paper, an efficient procedure to composite adsorbent was established by rectofite loaded ehitosan and the chemical structure of composite adsorbent was characteried by X-ray diffraction （ XRD ） and scanning electron microscrope （ SEM ）. The adsorption behavior of Cd^2＋ by composite adsorbent was investigated. The optimum adsorping conditions were determined through orthogonal experiments：when the pH value 7,the adsorption time 30min,the dosage of adsorbent O. 3g and the temperature 20℃, the rate of Cd^2＋ adsorption was up to 99%. The treated effluent met the first-class standard of National Wastewater Discharge Standard（ GB8978-1996 ）. Fitting the experimental data utilizing the related mathematic modeis, show the isotherm adsorption equilibrium fit Langmuir model and Freundlich model.

关 键 词：累托石 壳聚糖 吸附 Cd2+ 

分 类 号：O621.3[理学—有机化学]