接枝羧基壳聚糖的合成及其对重金属离子的吸附性能  

Synthesis of Carboxylcontaining Grafted Chitosan Polymer and ItsAdsorption Properties for Heavy Metal Ions

作　　者：彭长宏[1] 汪玉庭[1] 程格[1] 唐玉蓉[2] 

机构地区：[1]武汉大学环境科学系 [2]武汉大学分析测试中心

出　　处：《环境科学》1998年第5期29-33,共5页Environmental Science

基　　金：国家自然科学基金

摘　　要：以壳聚糖（ＣＴＳ）为基体，经环氧氯丙烷交联，制备了水不溶性交联壳聚糖（ＣＣＴＳ），然后以Ｆｅ２＋－Ｈ２Ｏ２为引发剂，将丙烯腈单体接枝到ＣＣＴＳ分子骨架上，经皂化制得了水不溶性接枝羧基壳聚糖聚合物（ＣＴＣＡ）．经元素分析、ＦＴ－ＩＲ分析和Ｘ－粉末衍射分析表征了结构．ＣＴＣＡ含Ｎ量低于ＣＴＳ和ＣＣＴＳ，在交联、接枝和共聚过程中未破坏ＣＴＳ和ＣＣＴＳ中的吡喃苷六元环结构，其结构与预期吻合．研究了它对Ｃｕ２＋、Ｃｒ３＋、Ｃｄ２＋和Ｐｂ２＋的吸附性能，实验结果说明，ＣＴＣＡ对Ｐｂ２＋和Ｃｄ２＋具有较大的吸附容量，对Ｃｄ２＋的吸附速率大于Ｃｕ２＋，吸附容量受ｐＨ影响较大．探讨了其吸附作用机理．Water insoluble crosslinkedchitosan was prepared by crosslinking soluble chitosan with epichlorodydrin and carboxylcontaining grafted chitosan polymer was obtained by grafting acrylonitrile onto the crosslinkedchitosan with ferrous sulfatehydrogen peroxide as the initiator and finally by subjecting it to basing saponification,whose structure was confirmed by elemental analysis,FTIR spectra analysis and Xray diffraction analysis.The adsorption properties for Cu2+、Cr3+、Cd2+ and Pb2+ were studied also.It could be seen that the content of nitrogen in CTCA is lower than that in CTS and CCTS,and the characteristic peak of —COONa appeares at 1570cm-1 and 1470cm-1 in CTCA.It was also found that CCTS and CTCA have the characteristic peak of pyranylibration at 900cm-1 which demonstrats that the ring of pyanyl is not destroyed in the reaction of crosslinking and grafting.The adsorption experimental results showed that CTCA has good adsorption capacities for Pb2+ and Cd2+;the adsorption speed of CTCA for Cd2+ is higher than that of Cu2+ and the adsorption capacities are also affected by the acidity of medium.The chelate mechanism was investigated by FTIR spectra analysis and the XPS data of CTCA and CTCACu2+.

关 键 词：羧基壳聚糖 重金属离子 吸附 接枝共聚 废水处理 

分 类 号：TQ321.077[化学工程—合成树脂塑料工业] X705[环境科学与工程—环境工程]