Covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof

A technology of covalent organic framework and raw material composition, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of covalent organic framework membrane affecting practical application value, difficulty in effectively retaining dyes, and large pore size.

Active Publication Date: 2021-05-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore size of the covalent organic framework material is generally 2-5 nm, and the pore size of the prepared covalent organic framework membrane is correspondingly large, making it difficult to effectively intercept dyes, drugs, persistent organic pollutants and other small particles with a molecular weight less than 1000 Da. molecular
Therefore, the low rejection rate of covalent organic framework membranes seriously affects its practical application value.

Method used

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  • Covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof
  • Covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof
  • Covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare an aqueous solution containing 1% p-phenylenediamine and a small amount of glacial acetic acid, and adjust the pH value to 4 as an aqueous phase solution. Prepare 0.05% n-hexane solution of 1,3,5-trialdehyde phloroglucinol as the organic phase solution. Firstly, the aqueous phase solution was placed on the surface of the polyacrylonitrile support membrane, and after 60 seconds of adsorption, the excess solution was removed. Then, the organic phase solution was placed on the surface of the membrane, and after 120s of reaction, the excess solution was removed, and the unreacted monomer was washed away with n-hexane. Afterwards, the membrane was placed in a modified solution with a pH of 3 containing 0.5% aniline monomer, 0.2% ammonium persulfate, and a small amount of p-toluenesulfonic acid. After 2 hours of reaction, it was taken out and washed repeatedly with deionized water to prepare a high rejection rate. Covalent organic framework membranes.

[0046] After...

Embodiment 2

[0049] An aqueous solution containing 2% of 1,3,5-tris(4-aminophenyl)benzene and a small amount of hydrochloric acid was prepared, and the pH value was adjusted to 3 as an aqueous phase solution. Prepare 0.05% n-hexane solution of 1,3,5-trialdehyde phloroglucinol as the organic phase solution. Firstly, the aqueous phase solution was placed on the surface of the polyacrylonitrile support membrane, and after 60 seconds of adsorption, the excess solution was removed. Then, the organic phase solution was placed on the surface of the membrane, and after 240s of reaction, the excess solution was removed, and the unreacted monomer was washed away with n-hexane. Afterwards, the membrane was placed in a modified solution with a pH of 10 containing 2% dopamine monomer, 0.1% ammonium persulfate, and a small amount of tris(hydroxymethyl)aminomethane. After reacting for 5 hours, it was taken out and washed repeatedly with deionized water to prepare A high rejection covalent organic framew...

Embodiment 3

[0052] Prepare an aqueous solution containing 1% p-phenylenediamine and a small amount of p-toluenesulfonic acid, and adjust the pH value to 4 as an aqueous phase solution. A 0.05% cyclohexane solution of 2,4,6-trihydroxybenzene-1,3,5-tricarbaldehyde was prepared as an organic phase solution. First, put the aqueous phase solution on the surface of the polysulfone support membrane, and remove the excess solution after adsorption for 100 seconds. Then, the organic phase solution was placed on the surface of the membrane, and after 120s of reaction, the excess solution was removed, and the unreacted monomer was washed away with cyclohexane. Afterwards, the membrane was placed in a modified solution with a pH of 2 containing 1.0% p-phenylenediamine monomer, 0.3% ammonium persulfate, and a small amount of hydrochloric acid. After reacting for 5 hours, it was taken out and washed repeatedly with deionized water to prepare a high rejection rate. Covalent organic framework membranes....

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Abstract

The invention relates to a covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof. The raw material composition comprises a water-phase monomer solution, an organic-phase monomer solution and a modified solution, the water-phase monomer solution comprises 0.01-2% by mass of a water-phase monomer, an acid regulator and the balance of water, wherein the water-phase monomer is selected from one or more of diamine or polyamine; the organic phase monomer solution comprises 0.01-2% by mass of an organic phase monomer and the balance of an organic solvent, and the organic phase monomer is selected from one or more of dialdehyde or polyaldehyde; the modifying solution comprises a modifying agent with the mass fraction of 0.01-5%, an oxidizing agent with the mass fraction of 0.01-3%, an acid-base regulator and the balance of water, wherein the modifying agent is selected from one or more of arylamine, heterocyclic amine or polyphenol. The covalent organic framework membrane provided by the invention improves the interception performance on small molecules, and has large permeation flux and good long-term operation stability.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane separation, in particular to a covalent organic framework membrane with a high rejection rate, a raw material composition and a preparation method thereof. Background technique [0002] The membrane pore size of the nanofiltration membrane is 0.5-2nm, which can effectively intercept divalent and multivalent salts, dyes, small organic molecules, antibiotics, disaccharides and polysaccharides, etc., and is used for small molecule removal, multivalent salt removal and small Molecular desalination and other fields. The unique pore size structure and charging performance of the nanofiltration membrane make it a new type of high-efficiency pressure-driven separation membrane, which can meet various separation requirements. In recent years, the research and development of nanofiltration technology has been rapid, and it has very broad application prospects in water treatment, biomedicine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D71/72C08G12/08C08G12/32
CPCB01D61/027B01D67/0006B01D71/72C08G12/08C08G12/32B01D2325/30Y02A20/131
Inventor 赵颂査志远毛晨岳王志
Owner TIANJIN UNIV
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