Method for preparing metal organic framework film

Abstract

The invention discloses a method for preparing a metal organic framework film by using carrier pretreatment and modification and electrostatic induction growth, belongs to the field of novel materials and relates to a method for preparing the metal organic framework film by attracting metal central ions by static electricity to induce the growth. The method is characterized by comprising the following steps of: loading a layer of uniform ionic electrified high polymer on the surface of a sheet type or tubular carrier by using an impregnating or spraying method in advance; then immersing the carrier into a synthetic liquid and attracting the central ions by static electricity; and inducing a metal organic framework structure crystal to preferably grow on the carrier to obtain a continuous metal organic framework film. The invention has the beneficial effect of providing the general method for preparing the metal organic framework film.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a method for preparing a continuous defect-free metal-organic framework (MOFs) film on the surface of a carrier, in particular to treating a porous carrier with an ionic charged polymer, and in situ induction by electrostatic action Growth preparation of metal-organic framework membranes is a general preparation method for preparing metal-organic framework membranes. Background technique [0002] With the massive consumption of primary energy such as fossil fuels, the cost of energy use has increased sharply. Energy conservation and emission reduction have attracted widespread attention in various fields. Especially in the field of separation, people are constantly seeking new technologies to replace traditional high-energy-consuming operations such as distillation, absorption, and extraction. Way. Membrane separation technology is a new type of separation technology that has attracte...

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Problems solved by technology

The existing preparation methods can be divided into three categories: (1) In situ growth method: [Aguado, et al., New J. Chem., 2011, 35: 41-44.] directly put the carrier into the film-forming solution Metal-organic framework membranes can be obtained by hydrothermal or solvothermal for a certain period of time. Due to the difference in properties between metal-organic materials and the surface of the carrier, it is difficult to prepare dense metal-organic framework membranes by this method; (2) carrier surface modification method: using aminopropylsilane coupling Agent [Aisheng Huang, et al., J. Am. Chem. Soc., 2010, 132: 15562-15564] to treat the carrier, relying on weak coordination to connect the film layer, in this method, the force between the film layer and the carrier is relatively weak; (3) Secondary growth method of seed crystals: using viscous polymer materials (polyethyleneimine, PEI) to connect nano-scale metal-organic framework materials on the surface of the carrier to obtain a seed layer, which is obtained by secondary growth in the synthetic solution Dense film layer, this method eliminates the performance difference between metal-organic and inorganic carrier surfaces, and is a typical preparation method in current reports, but this method needs to prepare nano-scale seeds with uniform size first, and the synthesis process has many steps, which increases the preparation time. process, the repeatability is limited, and the binding force between the membrane and the carrier is also poor

[0006] At present, the preparation of metal-organic framework membranes is still in its infancy, and the preparation process is immature. Moreover, the carriers used for the preparation of metal-organic framework membranes are mostly sheets. high difficulty

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