冠醚功能化的纤维素微球与锶离子的构效关系研究

Study on the structure-activity relationship between crown ether functionalized cellulose microspheres and strontium ions

放射性核素锶的分离去除对核废物的处理具有重要意义.通过辐射接枝的方法合成了一种以纤维素微球为基材的冠醚功能化微球,利用红外光谱、X射线光电子能谱、热失重等手段表征微球的结构组成,并通过理论计算研究了其与锶离子的构效关系.结果表明,功能化过程中引入的官能团在一定程度上会影响冠醚结构的配位能力,此外功能化微球的吸附分离能力与锶离子所处的环境有关.该研究为分离去除锶元素的微球设计和应用提供了一定的指导意见.

The separation and removal of strontium ions is of great significance to the treatment of nuclear waste.In this study,the functionalized microspheres based on cellulose microspheres were synthesized by radiation grafting method.The structure of microspheres was characterized by means of infrared spectroscopy,X-ray photoelectron spectroscopy,and thermo-gravimetric analysis,and the structure-activity relationship between the microspheres and strontium ions was studied by density functional theory calculation.The results indicated that the functional groups introduced during the functionalization process affected the coordination ability of the crown ether structure to a certain extent,and that the adsorption and separation capabilities of the functionalized microspheres were related to the environment in which strontium ions are present in the solution.The research provided some guidance for the separation and removal of strontium ions.