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 crosslinkedchitosan was prepared by crosslinking soluble chitosan with epichlorodydrin and carboxylcontaining grafted chitosan polymer was obtained by grafting acrylonitrile onto the crosslinkedchitosan with ferrous sulfatehydrogen peroxide as the initiator and finally by subjecting it to basing saponification,whose structure was confirmed by elemental analysis,FTIR spectra analysis and Xray diffraction analysis.The adsorption properties for Cu2+、Cr3+、Cd2+ and Pb2+ 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 Pb2+ and Cd2+;the adsorption speed of CTCA for Cd2+ is higher than that of Cu2+ and the adsorption capacities are also affected by the acidity of medium.The chelate mechanism was investigated by FTIR spectra analysis and the XPS data of CTCA and CTCACu2+.
出处
《环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1998年第5期29-33,共5页
Environmental Science
基金
国家自然科学基金
关键词
羧基壳聚糖
重金属离子
吸附
接枝共聚
废水处理
carboxylcontaining grafted chitosan polymer,adsorption properties,heavy metal ions,structure analysis,mechanism.
