Preparation method of modified metal-organic framework and composite nano-filtration membrane

A metal-organic framework, composite nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of stable membrane structure, low cost, and simple production process

Inactive Publication Date: 2018-08-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is: how to improve the dispersibility of the metal-organic framework in the membrane water and improve the water flux without reducing the anti-fouling performance of the membrane

Method used

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  • Preparation method of modified metal-organic framework and composite nano-filtration membrane
  • Preparation method of modified metal-organic framework and composite nano-filtration membrane
  • Preparation method of modified metal-organic framework and composite nano-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a composite nanofiltration membrane containing a modified metal-organic framework:

[0025] (1) Add 500 mg of ZIF-8 (a type of metal-organic framework) into 200 mL of an aqueous solution containing 3 mg / mL of tannic acid (TA), and react with rapid stirring for 5 min. Then, centrifuge to obtain the precipitate, wash the precipitate with deionized water several times, and freeze-dry to obtain the modified metal-organic framework (ZIF-8@TA);

[0026] (2) Preparation of aqueous phase solution: Dissolve 0.5wt% piperazine and 0.2wt% sodium hydroxide in deionized water, then add ZIF-8@TA with a concentration of 0.03wt%, and disperse it by ultrasonication for 5 minutes Uniform; immerse the wet polysulfone support membrane in the water phase solution for 5 minutes, take it out, roll the surface of the support membrane with a rubber roller, and squeeze it dry;

[0027] (3) Preparation of the oil phase solution: Dissolving trimesoyl chloride with a concent...

Embodiment 2

[0030] A preparation method of a composite nanofiltration membrane containing a modified metal-organic framework:

[0031] (1) Add 500 mg of ZIF-8 (a type of metal-organic framework) into 200 mL of an aqueous solution containing 3 mg / mL of tannic acid (TA), and react with rapid stirring for 5 min. Then, centrifuge to obtain the precipitate, wash the precipitate with deionized water several times, and freeze-dry to obtain the modified metal-organic framework (ZIF-8@TA);

[0032] (2) Preparation of aqueous phase solution: Dissolve 0.5wt% piperazine and 0.2wt% sodium hydroxide in deionized water, then add ZIF-8@TA with a concentration of 0.06wt%, and disperse it by ultrasonication for 5 minutes Uniform; immerse the wet polysulfone support membrane in the water phase solution for 5 minutes, take it out, roll the surface of the support membrane with a rubber roller, and squeeze it dry;

[0033] (3) Preparation of the oil phase solution: Dissolving trimesoyl chloride with a concent...

Embodiment 3

[0036] A preparation method of a composite nanofiltration membrane containing a modified metal-organic framework:

[0037] (1) Add 500 mg of ZIF-8 (a type of metal-organic framework) into 200 mL of an aqueous solution containing 3 mg / mL of tannic acid (TA), and react with rapid stirring for 5 min. Then, centrifuge to obtain the precipitate, wash the precipitate with deionized water several times, and freeze-dry to obtain the modified metal-organic framework (ZIF-8@TA);

[0038] (2) Preparation of aqueous phase solution: Dissolve 0.5wt% piperazine and 0.2wt% sodium hydroxide in deionized water, then add 0.10wt% ZIF-8@TA, and disperse it by ultrasonication for 5 minutes Uniform; immerse the wet polysulfone support membrane in the water phase solution for 5 minutes, take it out, roll the surface of the support membrane with a rubber roller, and squeeze it dry;

[0039] (3) Preparation of the oil phase solution: Dissolving trimesoyl chloride with a concentration of 0.10 wt% in n-he...

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Abstract

The invention discloses a preparation method of a modified metal-organic framework and a composite nano-filtration membrane. The preparation method of the modified metal-organic framework includes thesteps: modifying the surface of the metal-organic framework by the aid of plant polyphenol; forming a hollow structure in the metal-organic framework to obtain the modified metal-organic framework. The preparation method of the composite nano-filtration membrane containing the modified metal-organic framework includes the steps: loading the metal-organic framework into an aromatic polymer function surface layer of a porous supporting membrane by an interfacial polymerization method in situ to obtain the composite nano-filtration membrane. The modified metal-organic framework in the compositenano-filtration membrane is effectively loaded on the membrane and interacted with a surface layer polymer through a chemical bond, water flux, hydrophilcity and pollution resistance of the compositemembrane are improved, and structure stability and chlorine resistance of the composite nano-filtration membrane can be improved. The preparation method is simple and low in production cost and has good industrial production bases and wide application prospects, and the comprehensive performance of the membrane is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a modified metal-organic framework and a composite nanofiltration membrane, belonging to the technical field of membranes. Background technique [0002] Nanofiltration is a membrane process between reverse osmosis and ultrafiltration, with pore sizes in the range of a few nanometers. The nanofiltration process has a high rejection rate for divalent or multivalent inorganic ions and organic substances with a molecular weight between 200-1000Da. It has the advantages of simple operation, low energy consumption, and high separation efficiency. Desalination and concentration and purification and concentration of biochemical substances are widely used in industrial production and daily life, and have produced certain social and economic benefits. However, the widely used pure polymer nanofiltration membranes generally have problems of low flux, poor anti-pollution performance, and poor anti-chlorine performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01D69/12B01D67/00
CPCB01D61/027B01D69/125C08G83/008
Inventor 武培怡孙华圳
Owner DONGHUA UNIV
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