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Preparation method of composite film

A composite membrane and thin film technology, applied in the field of composite membranes, can solve the problems of difficulty in preparing MOF, weak interaction, complicated steps, etc., and achieve the effects of easy scale-up operation, mild conditions, and good application prospects.

Active Publication Date: 2018-09-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the weak interaction between MOF and support, it is difficult to nucleate and grow on the support surface, so it is difficult to prepare dense MOF
The secondary growth method introduces seeds on the surface of the carrier in advance, and then synthesizes and prepares the MOF film. This is a method that is widely used at present, and can effectively improve the quality of the prepared film, but the binding force between the film layer and the carrier is still relatively large. question
However, this chemical modification method has cumbersome steps and is not conducive to scale-up operations.

Method used

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Examples

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Embodiment 1

[0040] In this example, the ZIF-8-organosilicon composite film is constructed based on the metal-organic framework ZIF-8, and the preparation method is as follows:

[0041] (1) Preparation of ZIF-8-organosilicon precursor solution

[0042] (1-1) Synthesis of ZIF-8

[0043] The preparation of ZIF-8 adopts the reported synthesis method, specifically: 258mg of zinc nitrate and 263mg of dimethylimidazole were dissolved in 20mL of methanol respectively to obtain two solutions; then, these two solutions were mixed and stirred again A milky white solution was obtained in 5 minutes; the milky white solution was left to age for 24 hours, the product obtained was washed with methanol for 4 to 5 times, and finally the product was dried in an oven at 80 degrees for 24 hours to obtain ZIF-8.

[0044] The SEM picture of the ZIF-8 that above-mentioned makes is as figure 1 As shown, the average particle size of the molecular sieve is about 50nm.

[0045] (1-2) Synthesis of organosilicon pr...

Embodiment 2

[0058] In this example, the CAU-1-organosilicon composite film is constructed based on the metal-organic framework CAU-1, and the preparation method is as follows:

[0059] (1) Preparation of CAU-1-organosilicon precursor solution

[0060] (1-1) Synthesis of CAU-1

[0061] The preparation of CAU-1 adopts the reported synthesis method, specifically: add aluminum trichloride hexahydrate and 0.874g of aminoterephthalic acid into a 70mL polytetrafluoroethylene-lined kettle, and then add 60mL of React in methanol at 125°C for 5 hours, wash the product with methanol for 3 to 5 times, and finally dry it in a vacuum oven at 150°C for 48 hours to obtain CAU-1.

[0062] The SEM image of CAU-1 prepared above is as follows Figure 6 As shown, the average particle size of CAU-1 is about 50nm.

[0063] (1-2) Synthesis of organosilicon precursor solution

[0064] Mix 0.0206g of concentrated hydrochloric acid, 2.0394g of absolute ethanol and 6g of deionized water to obtain a hydrochloric ...

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Abstract

The invention provides a preparation method of a composite film. By the preparation method, an MOF material is combined with an organosilicone precursor material to form an MOF-organosilicone composite film on the surface of a carrier through high-temperature roasting. The composite film is continuous and compact, integrates the advantages of high throughput and a strong carrier binding force of organosilicone and the advantage of strong molecular sieving capacity of the MOF material, solves the problem of a weak bonding force between the composite film prepared based on MOF material and the carrier, and shows relatively high molecular sieving capacity and H2 permeation flux, and has a relatively good application prospect in the field of gas separation, gas purification and the like.

Description

technical field [0001] The present invention relates to the field of composite membranes, in particular to a preparation method for constructing organic-inorganic hybrid composite membranes based on metal-organic framework materials. Gas selective permeability. Background technique [0002] Metal-organic frameworks (MOFs) are a class of porous materials with specific topological structures and regular pore sizes formed by the connection of metal centers or metal clusters with organic ligands in the form of coordination bonds. Compared with other porous materials, MOFs have a larger specific surface area, and their structure, porosity, and pore structure can also be adjusted with different metals or ligands, and functional modification can also be performed. These excellent properties This makes MOFs materials have good potential application value in the fields of adsorption and separation, catalysis and sensors. [0003] The preparation methods of MOF membrane mainly inclu...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D69/12B01D53/22B01D67/00
Inventor 陈亮杜红斌孔春龙张秋菊
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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