Metal-organic framework cross-linked film based on click chemistry and its preparation method and application

Abstract

The invention discloses a click chemistry based metal-organic framework cross-linking membrane and a preparation method and application thereof.Polymerizable double bonds are introduced into MOFs (metal-organic frameworks) through a post-synthetic modification method, and the chemical cross-linking type MOF membrane is prepared in situ by thiol-ene click reaction, so that a novel rapid efficient solvent-free method mild in conditions is provided for MOFs membrane synthesis.By means of applying the strategy, an obtained independent homogeneous MOFs hybrid membrane material is excellent in membrane forming performance and toughness, and the defects of agglomeration of MOFs crystals and poor compatibility between the MOFs and polymers are overcome.The synthesized MOFs membrane material is excellent in selective separation effect on dye molecules in water and has a promising application prospect in the field of membrane separation.

Description

technical field [0001] The invention relates to a metal-organic framework crosslinked membrane based on click chemistry, a preparation method and application thereof, and belongs to the technical field of polymer separation membranes. Background technique [0002] Metal-organic frameworks (MOFs) are a new type of porous inorganic-organic hybrid crystalline material, which is composed of metal ions or metal clusters connected with organic ligands through covalent bonds. It exhibits the characteristics of both organic and inorganic materials. High porosity, controllable channels, structural diversity, rich functionality, simple preparation, etc. These unique advantages have attracted widespread attention. MOFs membrane materials have the characteristics of high efficiency, energy saving, economy, etc., and the application range can be extended to liquid and some gaseous media, such as membrane separation, fluorescence sensing, etc., so it has attracted extensive attention. Th...

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Problems solved by technology

However, this type of membrane material has many inherent limitations and defects: 1) The matrix material must meet the environment and conditions of MOFs crystal growth. Most crystals are synthesized under solvothermal conditions, and the stability of the matrix is ​​particularly critical. 2) The stability of MOFs The choice is limited to those with mild growth conditions, 3) The obtained MOFs membrane materials are usually hard and brittle, and difficult to peel off from the substrate

This type of membrane material has many advantages and has achieved good results and development, but it will encounter a thorny problem: the problem of crystal particle precipitation and aggregation during the film formation process, and the poor compatibility of MOFs materials and organic materials. It will reduce or even lose its film-forming properties, which will lead to the reduction of film stability, toughness, strength and physical defects, which will seriously affect the performance of the film.

However, this does not fundamentally solve the problem of restrictive contradictions between the physical and chemical properties of physically doped MOFs films.

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