Method for preparing nanoscale Cu-based metal organic framework material

Abstract

The invention discloses a method for preparing a nanoscale Cu-based metal organic framework material. The method includes the steps: (1) preparing a copper precursor solution A; (2) preparing an organic ligand solution B; (3) sending the solution A and the solution B into a micro channel reactor module I at a certain flow speed, generating a Cu-MOFs crystal seed in situ, and after the reaction is carried out for a certain time, sending the product material liquid into a module II; (4) when the product material liquid enters the module II, sending the solution B into the module II at a certain flow speed, carrying out crystal seed induced synthesis reaction, and after the reaction is carried out for a certain period of time, sending the product material liquid into a module III; (5) allowing the material liquid prepared in the step (4) to enter the micro channel reactor module III, and carrying out secondary crystallization reaction to synthesize a Cu-MOFs material; and (6) carrying out solid-liquid separation of the Cu-MOFs suspension prepared in the step (5), and allowing the filtrate to return to the micro channel reactor module II at a certain flow speed to participate in secondary crystallization reaction; and washing the solid with ethanol, and drying to obtain the product. The Cu-MOFs material is prepared by a multi-module micro channel reactor, and the method has the advantages of simple and fast preparation process, good product performance and the like.

Description

Technical field [0001] The invention relates to a method for preparing a metal organic framework material, in particular to a method for preparing a nano-scale Cu-based metal organic framework material by using a microchannel reactor. Background technique [0002] Metal organic framework materials (MOFs), also known as metal coordination polymers, refer to crystalline materials formed by connecting inorganic metals or metal clusters with nitrogen and oxygen-containing multidentate organic ligands through coordination bonds. Surface area, adjustable pore size, organic functionalized porous material. Cu-based metal organic framework (Cu-MOFs) materials are a type of MOFs with a hole-cage structure. In 1999, Chui et al. used a solvothermal method to synthesize Cu-MOFs. Later, researchers used different preparation methods to synthesize Cu-MOFs with different physical and chemical properties. The preparation methods include hydrothermal, microwave, sonic, and Methods such as electr...

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Problems solved by technology

[0006] The above-mentioned methods for preparing metal-organic framework materials are all batch reaction synthesis methods, which have disadvantages such as long reaction time, low product yield, and unstable product performance during the preparation process, which is not conducive to large-scale industrial scale-up production of products

In addition, a large amount of organic solvent is consumed in the above preparation process, and a large amount of organic liquid is produced after the preparation, including unreacted metal precursors, organic ligands, and organic solvents, which not only reduces the utilization efficiency of raw materials, but also increases the waste of organic liquid. processing cost

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