甲壳胺纤维的螯合性能

Chelate Property of Chitosan Fiber

把甲壳胺纤维与CuSO4和ZnSO4的水溶液处理后,通过控制处理的时间可以使纤维吸附不同含量的金属离子。研究了纤维上的金属离子的含量对纤维的物理机械性能的影响。结果表明,吸附金属离子后,纤维的干强和湿强都有明显的增加。纤维上的金属离子可以被EDTA的水溶液洗去,从而可以使纤维重复地应用于废金属离子的回收利用。把甲壳胺纤维进行乙酰化处理后,纤维可以在固体状态下转化成甲壳素纤维。实验结果表明,乙酰化后的纤维失去了它们对金属离子的螯合性能,从而证明了甲壳胺纤维的螯合性能主要来自于纤维上的自由胺基团。

After chitosan fibers were treated with aqueous solutions of CuSO4 and ZnSO4, by controlling the treatment time, it was possible for the fibers to absorb different quantities of metal ions. This paper studied the effect of the amount of metal ions in the fibers on the physical and mechanical properties of the chitosan fibers. The results showed that both the dry and wet strengths of the fibers increased significantly after the absorption of metal ions. The metal ions could be washed off from the fibers by a treatment with aqueous solutions of EDTA, henced the fibers could be used repeatedly for the recovery of heavy metal ions. When the fibers were treated with acetic anhydride, it was possible to acetylate the chitosan fibers and converted them into chitin fibers. Results showed that after the acetylation, the fibers lost their ability to chelate heavy metal ions, which indicated the fact that the chelation of metal ions was due mainly to the free amine groups in the chitosan fibers.