PUREX流程钚尾端中低浓度磷酸三丁酯（Tri-n-butyl phosphate，TBP）和铀的分离是乏燃料后处理中关键的科学问题之一。吸附法是一种有效的分离技术，然而当前采用不同类型树脂吸附TBP和铀，存在树脂热稳定性弱、辐照稳定性差、使用量大等问题。本项目拟开发新型有序大孔二氧化硅材料，用于连续高效分离TBP和铀。研究采用结构化学的理论与方法，设计、优化有序大孔二氧化硅的制备，提升TBP和铀在材料内的扩散速度和络合效率；研究模板尺寸、正硅酸四乙酯溶液配比等、煅烧程序对二氧化硅孔径、孔道结构、官能团含量等的影响；探索固液比、接触时间、温度、初始浓度等对吸附影响；采用朗格缪尔、弗雷德里希和准一级、二级动力学、波谱和能谱等研究连续吸附TBP和铀。该项目为乏燃料后处理中连续分离TBP和铀提供科学依据。

The separation of tri-n-butyl phosphate (TBP) and uranium of low concentration in the plutonium recovery section of the PUREX process is one of the key scientific problems in spent fuel reprocessing. As the adsorption technique is effective, various resins are used to separate TBP and uranium, respectively. However, resins have several defects such as weak thermal and irradiation stability, and overcommitting. The project here intends to develop novelly ordered-macroporous silicon dioxide materials for the efficiently continuous separation of TBP and uranium. The theory and method of structural chemistry will be adopted to design and optimize the preparation of ordered-macroporous silicon dioxide materials with the aim of improving the diffusion speed and complexation efficiency of TBP and uranium. The effect of the template size, the solution composition of tetraethyl orthosilicate and calcination procedure on the pore structure and functional group amount is to be studied. The influence of solid-liquid ratio, contact time, temperature and initial concentration on the adsorption will be explored. The mechanism of continuous adsorption of TBP and uranium will be explored by using Langmuir, Freundlich and pseudo-first order, pseudo-second order kinetics, spectrum and energy spectrum. The project will provide a scientific basis for the continuous separation of TBP and uranium in spent fuel reprocessing.