Porous fluid as well as preparation method and application thereof

Abstract

The invention provides a porous fluid as well as a preparation method and application thereof. The preparation method comprises the steps that: 2-methylimidazole and N-(3-azide)-N, N-dioctyl-N-methyl ammonium bromide are dissolved in an organic solvent, under the protection of inert gas, COR and PMDETA are added, stirring is conducted for 8-14 h at the room temperature, and a crude product A is obtained; the crude product A is purified and dried to obtain a substance A; the substance A, PEGS and an ethanol solution are mixed, a reaction is performed at 60-80 DEG C for 8-14 hours, and dialyzing is performed for 60-80 hours to obtain an ionic liquid for later use; and nano-scale MOFs are dispersed in an ethanol solution, then the ionic liquid obtained in S2 is added, uniform mixing is performed, shaking is performed for 8-14 hours, the solvent is removed, and drying is performed to obtain the porous fluid. The porous fluid provided by the invention has both flowability and porosity, and has a wide application prospect.

Description

technical field [0001] The invention relates to a porous fluid and its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs): Metal ions or metal clusters (ie: SBU, secondary building units) and organic ligands are linked together through metal-organic ligand bonds. The properties of materials are determined by their structures. The basic building blocks of MOFs are central metal ions and organic ligands. Therefore, the design and synthesis of open-frame coordination polymers can be achieved at the molecular level by selecting appropriate metal ions and steric ligands with extended effects. Self-assembly is carried out on the surface, and the structure of the complex is regulated by appropriate means to obtain MOFs materials with novel structures and special properties. Due to their high porosity, good chemical stability, reproducibility, simple synthesis process and equipment, and their exquisite framework structure, MOFs have at...

AI Technical Summary

Problems solved by technology

If a small molecule solvent is used as a medium, it will lead to a decrease in the porosity of the MOF material

[0004] The currently reported porous fluids are as follows, 1) porous fluids based on crown ether imine cages, 15-crown-5 as a solvent, macromolecular solvents cannot enter the crown ether imine cages, effectively retaining porosity, but due to the organic porous The structure is soft and amorphous, and the pores are difficult to characterize and modify; 2) Porous fluids based on porous silicon spheres and porous carbon spheres have a single pore structure and cannot be selectively adsorbed; 3) Porous fluids obtained by directly dispersing MOF in ordinary ionic liquids , the ionic liquid is small, and it is easy to enter the pores of some MOFs with larger pore diameters, resulting in a decrease in porosity, and there is no interaction between the ionic liquid and the MOF surface, resulting in an unstable colloidal dispersion system, easy aggregation, and poor universality

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