增塑壳聚糖膜对Pb^(2+)的吸附性能及机理研究  

Adsorption Properties and Mechanism Studies of pb^(2+) on Plasticized Chitosan Film

作　　者：张海连[1] 杨孝蓉[1] 何雪[1] 张晓娇[1] 吴芳[1] 

机构地区：[1]乐山师范学院化学学院,四川乐山614000

出　　处：《乐山师范学院学报》2015年第4期47-50,共4页Journal of Leshan Normal University

基　　金：乐山市科技计划项目(14GZD022)

摘　　要：制备了一系列甘油增塑的壳聚糖膜(GLCS),利用扫描电镜(SEM)观察了膜吸附Pb2+前后的表面形貌,利用原子吸收光谱(AAS)研究了甘油含量、膜的活化方式对吸附的影响,分析了Pb2+的初始浓度、吸附温度、吸附时间等对吸附量的影响。结果表明:甘油的引入有效提高了Pb2+的吸附量;采用Na OH活化优于氨水-乙醇的活化方式;吸附行为更符合二级动力学模型和Freundlich机制,降温有利于吸附。当用1M的Na OH活化4h、Pb2+初始浓度为4075.5mg·L-1时,于p H 5.0溶液中,30℃下吸附48h后薄膜对Pb2+的吸附容量达到了221.8mg·g-1。A series of chitosan films plasticized by glycerol （GLCS） were prepared. The morphology of GLCS was characterized by scanning electron microscopy （SEM） before and after adsorption of Pb2＋ in solution. The effects of glycerol content and activation method of films on adsorption were studied by atomic absorption spectroscopy （AAS）. Then the initial concentration of pb2＋,temperature and adsorption time on adsorption performance were discussed. The results demonstrates that introduction of glycerol can significantly improve the adsorption capacity of Pb2＋,and NaOH activation method is better than that of ammonia-ethanol. The adsorption mechanism and thermodynamic analysis shows that the adsorption behavior of Pb2＋is more in line with the second-order kinetic equation and Freundlich model,and lower temperature is advantageous to the adsorption. When activated by 1M NaOH for 4h,and the initial concentration of Pb2＋is 4075.5mg＆#183;L-1,the adsorbing capacity of 40%-GLCS film is up to 221.8mg＆#183;g-1,in pH 5.0 solution at 30oC after 48h.

关 键 词：壳聚糖 甘油 活化 FREUNDLICH模型 二级动力学方程 

分 类 号：O636.9[理学—高分子化学]