Metal-organic framework membrane and preparation method thereof

Abstract

The invention discloses a method for preparing a metal-organic framework film. The method comprises: contacting a metal source with an organic ligand and forming a metal-organic framework film on a substrate by a hot pressing method. The method of the present invention can more conveniently and quickly obtain a large amount of metal-organic framework membranes with high purity, realize industrial production and application, and has the advantages of low cost, simple operation, rapid production, batch production and high purity.

Description

technical field [0001] The invention relates to the field of applied chemistry, in particular to a method for preparing metal-organic framework membranes. Background technique [0002] Metal-organic frameworks are a kind of crystalline porous materials, which are constructed by coordination between metal clusters or metal ions and organic ligands. They have the advantages of both inorganic and organic porous materials, with high specific surface area, orderly and repeatable channels, Rich functional groups, good stability, and diverse structures. Metal-organic framework membranes are one of the important application fields of metal-organic frameworks, and are widely used in gas separation, catalysis, sensors and many other fields. The preparation methods of metal-organic framework membranes mainly include in-situ growth method, LBL deposition method, seed crystal method, and sonochemical method. [0003] The in-situ growth method refers to directly putting the substrate fo...

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Problems solved by technology

[0003] The in-situ growth method refers to directly putting the substrate for film formation into the reaction solution, and growing metal-organic framework crystals on the surface of the substrate. This method is simple to operate, but the reaction time is long, film defects are prone to occur, there are too many impurities, and it is difficult to expand the amount. Production; the LBL deposition method is to pre-modify the organic groups on the surface of the substrate first, and then place the substrate in the metal solution and the organic ligand solution in turn, and grow layer by layer to obtain a metal-organic framework film. The advantages of this method are simple operation, The product has high purity, but the processing time is long, and it is difficult to expand mass production; the seed crystal method is to pre-coat the seed crystal on the surface of the substrate, and then place it in the reaction solution to grow in situ to form a film. This method makes up for the in situ growth method to a certain extent. It is easy to have the defects of membrane defects and excessive impurities, but there are still relatively long reaction times compared with the present invention, and it is difficult to achieve mass production; the sonochemical method is a new method developed in recent years, which is achieved by placing the substrate The reaction solution is ultrasonically produced to produce metal-organic framework membranes. The advantage of this method is that the reaction conditions are mild (it can be carried out at room temperature), and the reaction is faster than other methods. However, its products often have a large number of defects, insufficient purity, and difficulty in mass production. Big

[0004] Generally speaking, the current preparation method has a long production cycle, insufficient batch production capacity, low yield, and high relative production cost, which needs to be improved urgently

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