随着我国核能事业的不断发展，乏燃料后处理、核废物处置以及放射性元素的污染防治成为制约核能可持续发展的关键因素，因此亟需开发各种新的放射性元素分离材料及相关技术。纯无机结构的二维层状碳化钛具有良好的辐照稳定性、热稳定性、导热性以及大量的重金属离子吸附位点，有望作为潜在的新型放射性元素吸附剂。本项目拟通过化学刻蚀，结合活化、插层、剥层、功能化等技术，合成性能优异的二维层状碳化钛及其复合物材料，并将其用于放射性元素的吸附与富集相关研究。在此基础上，利用先进的同步辐射技术结合密度泛函理论计算，深入揭示层状碳化钛与放射性元素的相互作用机理；并尝试采用高温固相烧结技术处理吸附后的样品，探索该材料用于放射性元素封装与固定化研究的可行性。此外，还将尝试开发基于层状碳化钛的新型核素分离技术，如电吸附和膜分离等。本项目的实施可为二维层状碳化钛及其复合物在核废物处理与处置中的应用提供科学依据和技术参考。

With the augmentation of nuclear energy industry in China, spent fuel reprocessing, nuclear waste disposal and radionuclide pollution control in the environment are becoming essential factors for the sustainable development of nuclear energy, which make the preparation of novel materials and related innovative techniques for radionuclide separation highly desired. Inorganic two-dimensional layered titanium carbide materials can be potentially used as novel and highly efficient radionuclide sorbents, due to their radiation resistance, high-temperature stability, and abundant adsorption sites on the surface for heavy metal ions. In this project, we first design and synthesize a series of two-dimensional layered titanium carbide and its composites by using chemical etching method, in combination with other treatment techniques such as activation, intercalation, delamination, functionalization, etc. And then the adsorption behaviors of radionuclides with these novel materials will be systematically investigated. The corresponding interaction mechanisms will be studied with the assistance of advanced synchrotron radiation techniques in combination with density functional theory simulations. Meanwhile, solid phase sintering treatment will be employed to test the feasibility of the encapsulation and immobilization of hazardous radionuclides in calcined samples. In addition, based on the as-such synthesized materials, we will try to develop new separation techniques for radionuclides such as electro-adsorption and membrane separation. It is expected that this project will provide valuable scientific insights into the applications of two-dimensional layered titanium carbide and its composites in future nuclear waste process and disposal.