The Multifunctional Uranyl Phosphonate Framework Material:Uranyl Adsorption And Uranyl Ion Fluorescence Detection

To achieve the goals of“carbon neutrality”and“emission peak”,the adoption of clean and renewable energy is inevitable,and nuclear power has become one of the essential strategies for national development due to its high energy density,zero carbon emission,and high reliability.The higher requirements are placed for the uranium-based nuclear fuel cycle process with the rapid development of the atomic energy industry.To improve the related process level,fundamental research on uranium and the development of new uranium-based functional materials have put forward higher requirements.Due to uranium’s physical and chemical properties,the most common uranyl ion(UO₂²⁺)is used to form coordination compounds with novel structures,rich properties,and potential applications.Among them,metal-organic frameworks（MOFs）have attracted more attention due to their excellent designability and porosity,but their stability needs to be enhanced.Considering the high chemical stability and the strong affinity of the phosphonate group with UO₂²⁺,this subject is devoted to designing and preparing multifunctional uranyl phosphonate framework materials for civilized applications in environmental protection.To realize the recycling of uranium,a concept about waste management is claimed:cyclic utilization of the matter based on one compound（CU@one）,which provides an idea for radioactive pollution control.The specific research contents are as follows:1.A three-dimensional porous metal-organic framework UPF-105 was synthesized,utilizing the hydrothermal reaction of uranyl nitrate and a multidentate and sterically hindered phosphonate ligand.UPF-105 shows excellent thermal and chemical stability.This work enriches the basic theory of framework materials with uranium as the metal center and provides a solution for the treatment and disposal of nuclear waste.2.The material’s structural and fluorescence properties are utilized to adsorb and detect uranyl ions in radioactive wastewater.On the one hand,UPF-105 can selectively adsorb U（VI）,and the maximum adsorption capacity of U（VI）can reach 170.23 mg?g^-1 after 12 h.On the other hand,this subject creatively establishes a relationship between the relative fluorescence intensity of UPF-105 and the initial concentration of the solution,making UPF-105 a well-suitable sensor for concentrations of uranyl ions in the range of 5～90 ppm.Therefore,the subject completes the extraction,processing,and detection of U（VI）,which aligns with the concept of CU@one proposed above.The whole process is green and environmentally friendly.It will not cause further secondary pollution due to the introduction of other substances,which optimizes nuclear waste management and contributes to nuclear energy’s safe,efficient,and sustainable development.