A kind of mofs material that adsorbs and separates rhenium or technetium and its preparation method and application

Abstract

The invention discloses a MOFs material for adsorbing and separating rhenium or technetium and its preparation method and application. The preparation method comprises the following steps: under the action of a catalyst, tetrakis (4-bromophenyl) ethylene and silicon trimethylacetylene are mixed in a solvent Reaction obtains 4-(2-(trimethylsilyl) ethynyl) tetraphenylethylene; reacts with sodium hydroxide again, and the obtained tetra(4-ethynylphenyl) ethylene and 4-iodopyridine act as catalysts , react in a solvent to obtain 4-(4-(pyridyl) ethynyl) tetraphenylethylene ligand, the ligand and nickel nitrate are mixed in an organic solvent, after heating and reacting, the product is filtered, washed, and dried to obtain the obtained The above MOFs materials. Because of its triple interspersed structure, compared with most adsorbed TcO 4 ‑ Due to the existence of large-sized one-dimensional channels, the material has stronger selectivity and better stability, and the structure remains unchanged after the adsorption of pertechnetate.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel reprocessing, in particular to a MOFs material for adsorbing and separating rhenium or technetium, a preparation method and application thereof. Background technique [0002] As a clean and effective energy source, nuclear energy has undergone rapid development in the first half century, providing an indispensable energy supply for the country with the rapid economic growth of our country, but the strong radioactive waste it produces has gradually become a major threat to the ecological environment. threaten. Accidents, nuclear weapons experiments and nuclear accidents will produce a large amount of radioactive waste, which will have a bad impact on the environment. The radioactive product Tc-99 acts as a long-lived fission product (t 1 / 2 =2.13×10 5 Years), because it is easy to form steam and volatilize during the process of vitrification of waste, it is difficult to fix it. Pertechnetat...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor adsorption selectivity, slow adsorption kinetics and low adsorption capacity of pertechnetic acid adsorption materials in the prior art, the present invention provides a MOFs material for adsorbing and separating rhenium or technetium, which uses 4-(4-(pyridyl) Ethynyl)tetraphenylethylene is used as a ligand to form a cationic MOFs material after being coordinated with a nickel salt. The four nitrogen atoms on the ligand are coordinated with the nickel atom, and the water molecules participating in the coordination are used as alternative sites. The triple The interspersed topological structure forms a hydrophobic one-dimensional channel, which has the advantages of high adsorption capacity and fast adsorption kinetics

Images