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A kind of rigid mof composite membrane preparation method for organic dye nanofiltration

An organic dye, composite membrane technology, applied in the field of materials, can solve problems such as interface defects, achieve the effects of good separation performance and stability, easy industrialization, and low cost

Active Publication Date: 2021-01-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although MOF-based films have many advantages, there are still many problems to be solved during the preparation process, such as the distribution of MOF particles on the surface of the substrate, the uniformity of particle size, and the interface defects between MOF particles, etc.

Method used

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  • A kind of rigid mof composite membrane preparation method for organic dye nanofiltration
  • A kind of rigid mof composite membrane preparation method for organic dye nanofiltration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The organic polymer base membrane used is a commercial polyacrylonitrile material in the form of a flat ultrafiltration membrane with a molecular weight cut-off of 200,000 and an effective diameter of 3 cm. The cross-linking agent used is polyethyleneimine, and the solvent used is deionized water.

[0027] (1) Using conventional hydrolysis modification technology, the cyano group (-CN) on the surface of polyacrylonitrile (PAN) ultrafiltration membrane is hydrolyzed into carboxyl group (-COO - ). First prepare 2mol / L NaOH solution, immerse the polyacrylonitrile ultrafiltration membrane in it at 65°C for 1 hour, and modify it into a polymer membrane with carboxyl groups on the surface;

[0028] (2) Take out the modified polymer film and rinse it with a large amount of deionized water to neutrality;

[0029] (3) NaOH, CH 3 COOH and Ca(OH) 2 4H 2 O was dissolved in 40 mL of deionized water, and under the action of ultrasonic stirring, Ca 2+ A metal ion precursor solut...

Embodiment 2

[0041] The organic polymer base membrane used is a commercial polyacrylonitrile material in the form of a flat ultrafiltration membrane with a molecular weight cut-off of 200,000 and an effective diameter of 3 cm. The cross-linking agent used is polyethyleneimine, and the solvent used is deionized water.

[0042](1) Using conventional hydrolysis modification technology, the cyano group (-CN) on the surface of polyacrylonitrile (PAN) ultrafiltration membrane is hydrolyzed into carboxyl group (-COO - ). First prepare 2mol / L NaOH solution, immerse the polyacrylonitrile ultrafiltration membrane in it at 65°C for 1 hour, and modify it into a polymer membrane with carboxyl groups on the surface;

[0043] (2) Take out the modified polymer film and rinse it with a large amount of deionized water to neutrality;

[0044] (3) NaOH, CH 3 COOH and Ca(OH) 2 4H 2 O was dissolved in 40 mL of deionized water, and under the action of ultrasonic stirring, Ca 2+ A metal ion precursor soluti...

Embodiment 3

[0055] The organic polymer base membrane used is a commercial polyacrylonitrile material in the form of a flat ultrafiltration membrane with a molecular weight cut-off of 200,000 and an effective diameter of 3 cm. The cross-linking agent used is polyethyleneimine, and the solvent used is deionized water.

[0056] (1) Using conventional hydrolysis modification technology, the cyano group (-CN) on the surface of polyacrylonitrile (PAN) ultrafiltration membrane is hydrolyzed into carboxyl group (-COO - ). First prepare 2mol / L NaOH solution, immerse the polyacrylonitrile ultrafiltration membrane in it at 65°C for 1 hour, and modify it into a polymer membrane with carboxyl groups on the surface;

[0057] (2) Take out the modified polymer film and rinse it with a large amount of deionized water to neutrality;

[0058] (3) NaOH, CH 3 COOH and Ca(OH) 2 4H 2 O was dissolved in 40 mL of deionized water, and under the action of ultrasonic stirring, Ca 2+ A metal ion precursor solut...

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Abstract

The invention discloses a method for preparing a rigid MOF composite membrane used for nanofiltration of organic dyes, comprising the following steps: pretreating the organic polymer base membrane so that its surface has a functional group-COO-; oxidizing the hydrogen Dissolve sodium, acetic acid and metal salts in water to prepare a metal ion precursor solution; place the obtained base film in the metal ion precursor solution and react at 25±2°C for 4‑6h; add a crosslinking agent solution to continue the reaction 10‑50min, wash to obtain a composite film after the end; dissolve sodium hydroxide and squarylium in water, and under the action of ultrasonic stirring, prepare an organic ligand precursor solution; place the obtained composite film in it at 25±2°C React for 30‑120min; take it out, wash it, and dry it to obtain a rigid MOF composite membrane. The preparation method of the membrane in the invention is simple, excellent in performance, low in cost and easy for industrialization. Moreover, the prepared nanofiltration membrane has good separation performance and stability for organic dyes, so it has broad application prospects in the nanofiltration of organic dyes.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a rigid MOF composite membrane used for nanofiltration of organic dyes. Background technique [0002] Water pollution is one of the most challenging problems in environmental pollution, which not only causes serious damage to the environment and ecology, but also has adverse effects on human health. In recent years, a variety of pollutants such as dyes, aromatics / organics, pharmaceutical and personal care products (PPCPs), herbicides / pesticides, and oil spills have been found in different natural surface water sources. The latest data show that textile printing and dyeing wastewater has become one of the largest sources of water pollution. Currently more than 100,000 commercially available dyes at a rate of 7×10 per year 5 The production rate of tons is output, usually about 2% of the product will be discharged into the water supply system i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/06B01D69/02B01D67/00C02F1/44C02F101/30C02F103/30
CPCB01D67/0093B01D69/02B01D71/06B01D71/82C02F1/442C02F2101/308C02F2103/30
Inventor 车圆圆聂开宦马睿一张志浩杨振杨柳
Owner WUHAN UNIV OF TECH
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