| 接枝羧基壳聚糖的合成及其对重金属离子的吸附性能 |
| 摘要点击 785 全文点击 2208 投稿时间：1998-01-04 |
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| 中文关键词 接枝羧基壳聚糖 重金属离子 吸附性能 结构分析 机理 |
| 英文关键词 carboxyl-containing grafted chitosan polymer adsorption properties heavy metal ions structure analysis mechanism |
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| 中文摘要 |
| 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。 |
| 英文摘要 |
| 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 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 FT-IR spectra analysis and the XPS data of CTCA and CTCA Cu2+. |
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