MOF (metal-organic framework) separating layer film and preparation method thereof

A metal-organic framework and separation layer technology, applied in the field of ion exchange membranes, can solve the problems of reduced ion flux, reduced strength, difficult control of the thickness of the MOF layer, etc., and achieves improved separation coefficient, improved flux, and a simple and controllable preparation method. Effect

Active Publication Date: 2017-11-28
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0005] 1. In order to improve the ease of use and stability of MOF materials, it is doped into polymer materials to form a mixed matrix membrane, and ions are sieved through the pore size of MOF inside the membrane. The common advantages with MOF improve the applicability of MOF materials, but the two materials are only mixed physically, and there is a fatal defect of phase separation, which will cause holes in the membrane, resulting in the inability to effectively treat ions of different valence states. Sieving, at the same time, will also lead to a reduction in the strength of the membrane itself;
[0006] 2. Grown MOF layer on the surface of inorganic materials. Although the method is simple, the thickness of MOF layer is difficult to control, and too thick separation layer will greatly reduce the ion flux of monovalent io

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  • MOF (metal-organic framework) separating layer film and preparation method thereof
  • MOF (metal-organic framework) separating layer film and preparation method thereof
  • MOF (metal-organic framework) separating layer film and preparation method thereof

Examples

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Example Embodiment

[0034] Therefore, the present invention provides a method for preparing a metal-organic framework separation layer membrane, which includes the following steps:

[0035] Step 1. Form a surface modification layer on the surface of the base film through interfacial polymerization reaction;

[0036] Step 2. Secondary growth on the surface modification layer to form a metal-organic framework separation layer to complete the preparation of the metal-organic framework separation layer membrane.

[0037] Specifically, the present invention provides a method for preparing a two-dimensional oriented metal organic framework separation layer film (MOF separation layer film), which includes the following steps:

[0038] Step S1, forming a surface modification layer on the surface of the base film through interfacial polymerization reaction;

[0039] Step S2: A MOF separation layer is formed by secondary growth on the surface modification layer obtained in Step S1 to obtain a MOF separation layer me...

Example Embodiment

[0061] Example 1

[0062] This embodiment proposes a method for preparing a MOF separation layer membrane. The preparation process is as follows: figure 1 As shown, specifically:

[0063] 1.1. Preparation of base film

[0064] A certain mass of brominated polyphenylene ether (degree of bromination 30% to 70%) is dissolved in methyl pyrrolidone to obtain a uniform membrane solution with a mass fraction of 20%. The membrane solution is evenly coated on the glass plate with a scraper Control the thickness of the membrane solution; immediately immerse the glass plate in water after uniform coating, and after soaking for 24 hours, take it out to obtain a base film, which is a porous film, which is a finger hole in this embodiment.

[0065] 1.2, base film interface polymerization reaction

[0066] 1.2.1. Dissolve aniline with an HCl solution with a concentration of 0.1~0.2mol / L, and configure it as an aniline hydrochloric acid solution, with a concentration of 0.1~0.15mol / L, the solution is ...

Example Embodiment

[0074] Example 2

[0075] This example proposes a method for preparing MOF separation layer membrane. The method is similar to Example 1, except that the modified membrane is put into 30ml (containing 8mmol cobalt sulfate and 5mmol 1-methylimidazole). ) In a polytetrafluoroethylene reactor containing a mixture of N,N-dimethylformamide and water, the volume ratio of N,N-dimethylformamide to water is 1:1, at a temperature of 100°C After reacting for 20 hours, take out the modified membrane and let it stand in the air for 1.5 hours; then put it into a polytetrafluoroethylene reactor filled with the mixed solution, react at 70°C for 26 hours, then take out the membrane and rinse with water, that is MOF separation layer membrane can be obtained. That is, after the secondary heating reaction, the two-dimensional orientation type MOF separation layer is formed by secondary growth on the surface modification layer of the base film to obtain the MOF separation layer film.

[0076] The mem...

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Abstract

The invention provides an MOF (metal-organic framework) separating layer film and a preparation method thereof. The preparation method comprises the following steps: a surface modification layer is formed on the surface of a base film through an interfacial polymerization reaction; an MOF separating layer grows secondarily on the surface modification layer, and preparation of the MOF separating layer film is completed. A preparation method of a positively charged MOF separating layer film further comprises the step that acid radical ions in the MOF separating layer film are removed by soaking the prepared MOF separating layer film in methyl alcohol. The MOF separating layer grows secondarily on the surface modification layer, and by means of the pore diameter screening action and a frame charging effect, the MOF separating layer film can effectively realize the effect of selective ion separation; layers of the MOF separating layer film are not formed through simple physical bonding, and accordingly, the defect of separation is overcome.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, and more specifically relates to a metal-organic framework separation layer membrane and a preparation method thereof. Background technique [0002] Metal-organic framework complexes (Metal-Organic Frameworks, MOF) are a new type of porous material with broad application prospects. It is a method of molecular assembly and crystal engineering of transition metal ions or metal clusters and organic ligands. Dimensions and framework of coordination polymers with cavities. In recent years, the research on the design, synthesis, structure and performance of such coordination polymer porous materials has been very active. MOF materials have great application prospects in many fields, especially in adsorption and separate fields. [0003] The research on the adsorption and separation of MOF materials mainly focuses on the adsorption and separation of gas mixtures, while relatively littl...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/82B01D69/02
CPCB01D67/0093B01D69/02B01D71/82B01D2325/04B01D2325/16B01D2325/42
Inventor 徐铜文伍斌葛亮
Owner UNIV OF SCI & TECH OF CHINA
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