Metal organic framework membrane and preparation method and application thereof

A metal organic framework, solid carrier technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in preparing ZIF-8 membranes

Active Publication Date: 2015-03-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In situ hydrothermal synthesis is currently the most commonly used synthesis method, but it is usually difficult to prepare dense ZIF-8 films due to the difficulty of nucleation and growth of ZIF-8 on the surface of the carrier

Method used

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  • Metal organic framework membrane and preparation method and application thereof
  • Metal organic framework membrane and preparation method and application thereof
  • Metal organic framework membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1. Synthetic ZIF-8 film

[0073] ZIF-8 membranes were synthesized as follows:

[0074] Step 1. Dopamine functional modification to synthesize ZIF-8 membrane carrier

[0075] Dissolve 0.3 g of dopamine in 100 mL of distilled water, stir and mix evenly, then add tris to control the pH of the solution to 8-10. Put the washed and dried porous alumina ceramics, porous titania ceramics, porous stainless steel and stainless steel mesh and other synthetic ZIF-8 membrane carriers into the above-mentioned dopamine buffer solution, react at room temperature for 6-24h, and rinse with distilled water and ethanol After drying at room temperature, polydopamine is introduced on the surface of the carrier for the synthesis of ZIF-8 membrane.

[0076] Step 2. Prepare the solution for ZIF-8 membrane synthesis

[0077] Weigh a certain amount of zinc chloride, 2-imidazole formaldehyde and sodium formate and dissolve in methanol, stir vigorously or sonicate until clarified. Th...

Embodiment 2

[0081] ZIF-8 membranes were synthesized as follows:

[0082] Steps 1 and 2 are the same as in Example 1.

[0083] Step 3. Synthesis of ZIF-8 membrane on the surface of dopamine-modified alumina support

[0084] After the porous alumina modified with dopamine function was fixed, it was placed horizontally in an autoclave, poured into the solution for synthesizing ZIF-8 membrane, and synthesized at 333K for 48 hours by conventional heating. After the reaction was completed and cooled to room temperature, the ZIF-8 membrane was taken out, rinsed with methanol several times, and then placed at room temperature for 48 hours for microstructure characterization and gas separation experiments.

Embodiment 3

[0086] ZIF-8 membranes were synthesized as follows:

[0087] Steps 1 and 2 are the same as in Example 1.

[0088] Step 3. Synthesis of ZIF-8 membrane on the surface of dopamine-modified alumina support

[0089] After the porous alumina modified with dopamine function was fixed, it was placed horizontally in an autoclave, poured into the solution for synthesizing ZIF-8 membrane, and synthesized at 373K for 12 hours by conventional heating. After the reaction was completed and cooled to room temperature, the ZIF-8 membrane was taken out, rinsed with methanol several times, and then placed at room temperature for 48 hours for microstructure characterization and gas separation experiments.

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Abstract

The present invention provides a high-selection hydrogen permeation separation performance metal organic framework membrane for efficient preparation, and especially relates to a zeolite imidazole organic framework membrane, and preparation method of ZIF-8 membrane and a metal organic framework membrane prepared by the method are provided. The method comprises the following steps: using dopamine for functional modification of a solid carrier; and synthesizing the metal organic framework membrane on the surface of the functionally modified solid carrier. By preparation of the metal organic framework membrane by the method, nucleation and growth are greatly enhanced, the prepared metal organic framework membrane is homogeneous and dense, falling-off condition after membrane formation can be significantly improved, and gas separation performance is good; the method has the advantages of mild operation condition, easy industrialized amplification, environment friendliness, and strong applicability. The method can also adopts microwave heating method, the reaction time can be shortened, and the cost of industrial production can be further reduced.

Description

technical field [0001] The invention relates to the field of metal organic framework membranes for gas separation and liquid separation. Specifically, the present invention relates to the preparation of uniform and dense metal-organic framework membranes with high selective hydrogen permeation separation performance through dopamine functional modification and the application of the prepared membranes. Background technique [0002] The separation process is an important operation process in industrial production. Compared with traditional separation methods such as distillation, extraction, and adsorption, membrane separation has the advantages of low energy consumption, simple operation, low investment, and no pollution. [0003] Metal-organic framework compounds are a new class of porous crystalline materials with regular pore structures developed in recent years, which have broad application prospects in the fields of gas adsorption and storage, catalysis, separation, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D67/00B01D69/00B01D61/00
Inventor 黄爱生刘倩
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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