新型黄原酸壳聚糖对铅离子的吸附及机理研究  

ADSORPTION PERFORMANCE AND MECHANISM OF LEAD IONS ADSORBED ON XANTHATED CHITOSAN

作　　者：宋庆平[1] 孟祥瑞[1] 王崇侠[1] 高建纲[1] 

机构地区：[1]安徽工程大学生物与化学工程学院,芜湖241000

出　　处：《离子交换与吸附》2014年第2期115-123,共9页Ion Exchange and Adsorption

基　　金：国家自然科学基金项目(51303002);安徽省高校自然科学基金项目(KJ2013B030)

摘　　要：以壳聚糖为原料,先合成O-羧甲基壳聚糖,再和二硫化碳反应制备出新型黄原酸壳聚糖,使用元素分析、FT-IR、UV和TG对其结构进行表征。比较了壳聚糖、O-羧甲基壳聚糖和黄原酸壳聚糖对铅离子的吸附能力,并研究黄原酸壳聚糖对水溶液中铅离子的吸附性能,探讨了铅离子溶液的pH值对吸附的影响和黄原酸壳聚糖对铅离子的吸附热力学。结果表明,黄原酸壳聚糖对铅离子吸附量是壳聚糖的8.37倍,平衡吸附量可达600.6mg/g。XPS表明,吸附过程主要通过吸附剂中的氨基、羧基和黄原酸基团与铅离子发生作用完成。O-earboxymethyl chitosan （OCMC） was prepared with chitosan as starting material, then a novel kind of xanthated chitosan （XCS） was synthesized via xanthation reaction of OCMC with CS2. The chemical structure of XCS was characterized by Element analysis, FT-IR, UV and TG. The adsorption performance of Pb2＋ on chitosan, OCMC and XCS was compared, and the adsorption capacity of Pb2＋ on XCS in aqueous solution was studied. The effect of initial pH value of the solutions on adsorption capacity of Pb2＋ on XCS was investigated and the adsorption process could be described by Langmuir isotherms very well. The experimental results showed the equilibrium adsorption capacity of Pb2＋ on XCS was 600.6rag/g, which was 8.37 times than that of chitosan. The results of XPS showed that the interaction between Pb2＋ and XCS occurred mainly in -NH2, -COO and S=C-S- groups.

关 键 词：壳聚糖 O-羧甲基壳聚糖 黄原酸壳聚糖 吸附 

分 类 号：O636.1[理学—高分子化学]