含羧基离子交换纤维合成及其对UO_2^(2+)的吸附性能研究

Synthesis of Carboxylic ion exchange fiber and its application in Uranium extraction

合成了一种经多胺交联的含羧基离子交换纤维,探讨了含羧基离子交换纤维对铀的吸附特性,考察了pH值、吸附时间、含U金属溶液初浓度对纤维吸附能力的影响,绘制出吸附等温线,并求出Langmuir曲线和Freundlich曲线方程。结果表明:含羧基离子交换纤维在pH>2,吸附时间为30min时对铀酰离子有良好的吸附性能,且U金属离子浓度越高,纤维的饱和吸附容量越大。红外光谱证明含羧基离子交换纤维在吸附铀酰离子时,与UO22+形成配合物,COO-参与配位。

A kind of carboxylic ion exchange fiber was synthesized. The fiber static adsorption properties to uranium ion have been investigated. The influence of different experimental parameters such as final solution pH value, fiber weight, sorption time, temperature and initial concentration of uranium ion were evaluated. The sorption isotherms of uranium were drawn. Langmuir and Freundlich equations were obtained. Results show that the fiber＇s absorption capacity is relative to the concentration of uranium ion when pH〉 2 and t=30 min. IR spectrum reveals that the carboxyl groups on the fiber are coordinated to uranium ion.