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Super-hydrophilic acetylene carbon composite nanofiltration membrane and preparation method thereof

A technology of composite nanofiltration membrane and alkyne carbon, which is applied in the field of membrane separation, can solve the problems of poor hydrophilicity, low flux, and poor pressure tightness of nanofiltration membranes, and achieve simple preparation methods, high-efficiency removal, and low-cost preparation raw materials Easy to get effect

Active Publication Date: 2020-02-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of material properties, these nanofiltration membranes generally have disadvantages such as poor hydrophilicity, low flux, and poor pressure tightness during the separation process.

Method used

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  • Super-hydrophilic acetylene carbon composite nanofiltration membrane and preparation method thereof
  • Super-hydrophilic acetylene carbon composite nanofiltration membrane and preparation method thereof
  • Super-hydrophilic acetylene carbon composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0033] Examples of the present invention provide the preparation method of the above-mentioned alkyne-carbon composite membrane, comprising:

[0034] Step a, washing the porous substrate with organic and inorganic solvents multiple times to remove surface organic matter and inorganic dust;

[0035] Step b. Accurately weigh a certain amount of alkyne carbon material, disperse it in a buffer solution, and perform ultrasonic treatment for a certain period of time to obtain a uniform alkyne carbon dispersion. Then add organic matter containing dopamine structure into the prepared dispersion liquid, add the prepared polyethyleneimine solution into it after stirring treatment, stir and ultrasonically treat alternately for 4-10 hours.

[0036] Step c, immerse the porous substrate treated in step a in the dispersion liquid obtained in step b for 1-12 hours, transfer it to a crosslinking agent solution after forming a film on the surface of the substrate for crosslinking treatment, and...

Embodiment 1

[0046] Use polyacrylonitrile (PAN) porous base membrane, the average pore size of the base membrane is 0.04um; choose CaC 2 The alkyne carbon material prepared by reacting with hexabromobenzene in a ball mill was used as an additive.

[0047] Step a, wash the PAN40 porous substrate with 30wt% ethanol solution for several times and then immerse it for 4 hours to remove surface organic matter, then rinse it with deionized water several times and then immerse it in deionized water for later use;

[0048] Step b. Accurately weigh 0.2 g of alkyne carbon material, disperse it in 400 ml of Tris-HCl buffer solution with pH=8.5, and use ultrasonic treatment for 2 hours to obtain a uniform alkyne carbon dispersion. Then, 0.8 g of dopamine hydrochloride was added to the prepared dispersion, and after stirring treatment, 4 g of prepared polyethyleneimine was added therein, and stirred and ultrasonically treated alternately for 4 hours.

[0049] Step c, immerse the PAN substrate treated i...

Embodiment 2

[0055] Use polyacrylonitrile (PAN) porous base membrane, the average pore size of the base membrane is 0.04um; choose CaC 2 The alkyne carbon material prepared by reacting with hexabromobenzene in a ball mill was used as an additive.

[0056] Step a, wash the PAN40 porous substrate with 50wt% ethanol solution several times, then immerse it in it for 4 hours to remove surface organic matter, then rinse it with deionized water several times and then immerse it in deionized water for later use;

[0057] Step b. Accurately weigh 0.2 g of the alkyne carbon material, disperse it in 400 ml of Tris-HCl buffer solution with pH=8.5, and use ultrasonic treatment for 3 hours to obtain a uniform alkyne carbon dispersion. Then, 0.8 g of dopamine hydrochloride was added to the prepared dispersion, and after stirring treatment, 4 g of prepared polyethyleneimine was added therein, and stirred and ultrasonically treated alternately for 4 hours.

[0058] Step c, immerse the PAN substrate treate...

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Abstract

The invention discloses a super-hydrophilic acetylene carbon composite nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The composite nanofiltration membrane comprises a porous membrane substrate and a selective separation layer; and the selective separation layer is formed by blending and depositing a novel acetylene carbon material, an organic matter containing a dopamine structure, and polyethyleneimine, the novel acetylene carbon material has a super-hydrophilic material surface and 2-5 nm inherent pore channels, the organic matter containing the dopamine structure can be subjected to a self-polymerization reaction, the surface of the acetylene carbon material is coated with the organic matter to enhance the adhesiveness and hydrophilicity, the polyethyleneimine and the dopamine polymerized organic matter adhered to the surface of the acetylene carbon material can be subjected to a Michael addition / Schiff base reaction to generate a coating layer on the surface of the substrate, and then the surface of the composite membrane is crosslinked under a high-temperature condition by using a crosslinking agent to obtain the super-hydrophilic acetylene carbon composite nanofiltration membrane. The composite membrane has a very high rejection rate and a very high permeation flux on various dyes and natural organic matters in water, and has a super-hydrophilic composite membrane surface.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a superhydrophilic alkyne-carbon composite nanofiltration membrane and a preparation method thereof. Background technique [0002] The separation performance of the composite membrane mainly depends on the properties of the membrane material itself and the structure of the membrane. The development of new membrane materials is still a key problem to be solved at present. For example, currently commercialized nanofiltration membranes are generally composite membranes with an ultra-thin selective separation layer and a porous support layer, and the separation layer is mainly a polyamide, polyester, polyvinyl alcohol or polyelectrolyte layer. However, due to the limitations of material properties, these nanofiltration membranes generally have disadvantages such as poor hydrophilicity, low flux, and poor pressure tightness during the separation process. The d...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D67/00B01D71/72B01D61/00C02F1/44C02F101/30
CPCB01D61/027B01D67/0079B01D69/02B01D69/125B01D71/021B01D71/72B01D2325/36C02F1/442C02F2101/308Y02A20/131
Inventor 孟洪赵广金李春喜
Owner BEIJING UNIV OF CHEM TECH
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