壳聚糖与壳寡糖结构及其对放射性核素铀吸附性能

采用酸碱滴定法测定壳聚糖和壳寡糖脱乙酰度分别为90.9%和90.1%，用IR方法表征了壳糖中乙酰基和氨基。 MALDI-FT-MS进一步给出了经葡聚糖凝胶柱纯化后壳寡糖脱乙酰度和聚合度的信息。 通过壳聚糖吸附性能的研究发现，壳聚糖对放射性核素铀具有较强的吸附能力，吸附率达96%以上，即使在大量Cu2+存在情况下，也可高效吸附放射性核素铀，说明壳聚糖有望成为一种新型的放射性核素吸附去污材料。

Structures of Chitosan and Chitooligosaccharide and Their Adsorption toward Radionuclide Uranium

The deacetylations(DD) of chitosan and chitooligosaccharide(COS) were estimated by titration of acid-base method as 90.9% and 90.1%, respectively. After Sephadex chromatography purification, the degree of polymerization(DP) and DD were obtained by MALDI-FT-MS. It was found that chitosan has high an adsorption of the radionuclide uranium. Chitosan showed high adsorption of radionuclide uranium even with the presence of large amount of Cu~(2+) ions. The adsorption efficiency is above 96%. This shows that chitosan has a great potential for the renoval of both heavy metals and radionuclides.