Study On MOF Adsorbent For Extracting Uranium From Seawater By Protein Spatial Structure Bionics

In order to improve the problem of global warming,people are constantly exploring clean alternative energy sources while reducing the use of fossil fuels.Nuclear energy is considered to be the preferred energy source for future use due to its sustainable use,cleanliness,and high reserves.Uranium is a major energy material in the nuclear power generation industry,and it is also a strategic guarantee resource for the sustainable development of nuclear energy in the country.There is an astonishing amount of uranium reserves in the ocean.In order to meet people’s demand for nuclear energy,advanced adsorption materials and technologies are urgently needed to develop seawater enriched uranium resources.Among the currently known natural seawater uranium enrichment materials,the amidoxime functional group shows relatively good application prospects,but the complex real seawater environment,such as the material fouling caused by the attachment of marine microorganisms,and the competitive coordination of a variety of interfering ions are still the factors that hinder the practical application of Amidoxime based materials in the field of seawater uranium extraction.In fact,most of the existing adsorbents are faced with these problems.Therefore,it is still an urgent problem to develop adsorption materials with high affinity and selectivity for uranyl ions.Inspired by the spatial structure of transuranyl binding protein,we simulated the spatial structure of transuranyl binding protein in metal organic framework(MOF).MOF Ui O-66-3C4 N was prepared by introducing 4-aminoisophthalic acid into Ui O-66.The adsorbent showed high uranyl extraction ability in both simulated seawater and natural seawater uranyl adsorption experiments.In natural seawater,the extraction capacity of Ui O-66-3C4 N for uranyl ions is 17.03 times that for vanadium ions.This test result shows that the prepared Ui O-66-3C4 N adsorbent has high selectivity for uranyl ions.EXAFS analysis and DFT calculation show that compared with transuranyl binding protein,the nano pockets formed by Ui O-66-3C4 N for uranyl capture are smaller,which can not only restrict the entry of other larger interfering ions,but also enhance the chelation of uranyl by increasing the coordination interaction.Therefore,the nano pockets of new MOF materials have high affinity and selectivity for uranyl.