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Preparation method of rigid MOF composite membrane for organic dye nanofiltration

A technology of organic dyes and composite membranes, applied in the field of materials, can solve problems such as interface defects, achieve good separation performance and stability, easy industrialization, and low cost

Active Publication Date: 2020-03-27
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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  • Preparation method of rigid MOF composite membrane 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 preparation method of a rigid MOF composite membrane for organic dye nanofiltration. The preparation method comprises the following steps: pretreating an organic polymer basemembrane to enable the surface of the organic polymer base membrane to have a functional group-COO-; dissolving sodium hydroxide, acetic acid and metal salt in water to prepare a metal ion precursorsolution; putting the obtained base membrane into the metal ion precursor solution and reacting at 25 + / -2 DEG C for 4-6 hours; adding a cross-linking agent solution, continuously reacting for 10-50 minutes and washing to obtain the composite membrane after the reaction is finished; dissolving sodium hydroxide and squaric acid in water and preparing an organic ligand precursor solution under the action of ultrasonic stirring; putting the obtained composite membrane into the solution and reacting at 25 + / -2 DEG C for 30-120 minutes; and taking out, washing and drying to obtain the rigid MOF composite membrane. The preparation method of the membrane is simple, excellent in performance, low in cost and easy to industrialize. The prepared nanofiltration membrane has good separation performanceand stability on organic dyes so that the nanofiltration membrane has a wide application prospect in the aspect of organic dye nanofiltration.

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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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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