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Preparation and application of PEI@COF composite membrane

A composite membrane, COF-LZU1 technology, applied in the field of preparation of PEI@COF composite membrane, can solve problems such as poor mechanical properties, achieve the effect of improving mechanical properties and increasing flexibility

Inactive Publication Date: 2021-06-25
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of COF membranes with better mechanical properties has become a current challenge due to the poor mechanical properties of independent COF membranes, and there are only few reports on the use of continuous COF membranes on porous supports for separation.

Method used

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  • Preparation and application of PEI@COF composite membrane
  • Preparation and application of PEI@COF composite membrane
  • Preparation and application of PEI@COF composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of COF-LZU1: Dissolve 100mg of trimesaldehyde and 100mg of p-phenylenediamine in 20ml of dioxane, then slowly add 0.4ml of 3mol / L acetic acid solution, seal and let stand for three days. After the reaction was completed, the precipitate was washed three times with methanol, and then vacuum-dried to obtain COF-LZU1 powder.

[0018] Preparation of PEI@COF composite membrane: Add cross-linking agent 1,4-butanediol diglycidyl ether or homophenylene to the mixed aqueous solution of PEI and COF-LZU1 powder with a mass ratio of 10:1 (total mass: 33 mg) Triformyl chloride (mass ratio to PEI is 1:1), after ultrasonic mixing, reacted for 12h, and then suction filtered to form a film.

Embodiment 2

[0020] Preparation of COF-LZU1: Dissolve 100mg of trimesaldehyde and 100mg of p-phenylenediamine in 20ml of dioxane, then slowly add 0.4ml of 3mol / L acetic acid solution, seal and let stand for three days. After the reaction was completed, the precipitate was washed three times with methanol, and then vacuum-dried to obtain COF-LZU1 powder.

[0021] Preparation of PEI@COF composite membrane: Add crosslinking agent 1,4-butanediol diglycidyl ether or phenylene to the mixed aqueous solution of PEI and COF-LZU1 powder with a mass ratio of 8:1 (total mass: 33 mg) Triformyl chloride (mass ratio to PEI is 1:1), after ultrasonic mixing, reacted for 12h, and then suction filtered to form a film.

Embodiment 3

[0023] Preparation of COF-LZU1: Dissolve 100mg of trimesaldehyde and 100mg of p-phenylenediamine in 20ml of dioxane, then slowly add 0.4ml of 3mol / L acetic acid solution, seal and let stand for three days. After the reaction was completed, the precipitate was washed three times with methanol, and then vacuum-dried to obtain COF-LZU1 powder.

[0024] Preparation of PEI@COF composite membrane: Add cross-linking agent 1,4-butanediol diglycidyl ether or phenylene to the mixed aqueous solution of PEI and COF-LZU1 powder with a mass ratio of 6:1 (total mass: 33 mg) Triformyl chloride (mass ratio to PEI is 1:1), after ultrasonic mixing, reacted for 12h, and then suction filtered to form a film.

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Abstract

The invention provides a preparation method and application of a PEI@COF composite membrane. The PEI@COF composite membrane is used for dye separation. The composite membrane comprises the steps: by taking polyethyleneimine, trimesic aldehyde and p-phenylenediamine as raw materials, firstly, carrying out reaction on the trimesic aldehyde and the p-phenylenediamine to prepare COF-LZU1, then adding a cross-linking agent 1,4-butanediol diglycidyl ether or trimesoyl chloride into a mixed aqueous solution of PEI and COF-LZU1 powder in different mass ratios, carrying out ultrasonic mixing, reacting for 24 hours, and finally, carrying out suction filtration to obtain the PEI@COF composite membrane. The preparation process of the obtained composite film is simple, the problem of poor mechanical property of COF independent film forming is solved, the flexibility is good, and the composite membrane has important application value in the field of dye separation.

Description

technical field [0001] The invention belongs to the field of separation, and in particular relates to the preparation of PEI@COF composite membranes. Background technique [0002] COFs are a new class of crystalline porous materials consisting of covalently linked organic units. Due to their unique properties, such as intrinsic porosity, well-defined pore size, ordered channel structure, large surface area, excellent thermal stability, and functionalization, COFs have attracted great attention in many fields in recent years , including gas storage, molecular separation, catalysis, and energy storage. In particular, these general architectures together with easy customization of functions make COFs excellent candidates for constructing molecular sieve membranes with excellent performance. However, the preparation of COF membranes with better mechanical properties has become a current challenge due to the poor mechanical properties of independent COF membranes, and there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/60
CPCB01D71/06B01D71/60B01D69/125B01D69/02B01D67/0006B01D2325/24
Inventor 张国梦龚鑫稳马贵平
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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