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A double-layer polyamide solvent-resistant nanofiltration membrane containing β-cd@zif-8 nanoparticles and its preparation method

A double-layer polyamide, nanoparticle technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve problems such as poor dispersion, achieve excellent solvent resistance, prolong experimental life, and advanced technology.

Active Publication Date: 2021-12-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a zeolite imidazolate framework-8 (β-CD@ZIF-8) nano-particle double-layer polyamide solvent-resistant nanofiltration membrane coated with β-cyclodextrin and its preparation method. The organic ligand 2-methylimidazole (HmIM) of ZIF-8 particles is introduced into the organic ligand solution of different molar ratios of β-CD to prepare β-CD@ZIF-8 nanoparticles, as described in the following step (2) , to solve the problem of poor dispersion of ZIF-8 in monomer solution

Method used

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  • A double-layer polyamide solvent-resistant nanofiltration membrane containing β-cd@zif-8 nanoparticles and its preparation method
  • A double-layer polyamide solvent-resistant nanofiltration membrane containing β-cd@zif-8 nanoparticles and its preparation method
  • A double-layer polyamide solvent-resistant nanofiltration membrane containing β-cd@zif-8 nanoparticles and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Using polyimide nanofibers as the support layer, firstly pretreat it: rinse repeatedly with isopropanol and soak for 12 hours, take it out and rinse with isopropanol again, and place it in the air until it is completely dry;

[0030] (2) Preparation of β-CD@ZIF-8 nanoparticles: Zn(NO 3 ) 2 ·6H 2 O:HmIM:β-CD=1:70:1 Prepare β-CD@ZIF-8 nanoparticles by zinc source, organic ligand, modifier, and wash by high-speed centrifugation at 12,000rpm and dry at 60°C;

[0031](3) Preparation of polymer spin-coating solution: According to the ratio of aramid fiber 1313:LiCl:β-CD@ZIF-8:DMAc=18:4.5:0:77.5, polymer, co-solvent, β-CD@ZIF-8 Fully mix and dissolve nanoparticles and organic solvents to prepare polymer spin-coating liquid;

[0032] (4) Spin coating film formation: with nitrogen as protective gas, the polymer spin coating solution prepared in step (3) is passed through the spin coating device with the first gradient: 3500rpm, 7s; the second gradient: 4000rpm, 3s; the se...

Embodiment 2

[0036] (1) Steps (1) to (2) are the same as in Example 1;

[0037] (3) Preparation of polymer spin-coating solution: According to the ratio of aramid fiber 1313:LiCl:β-CD@ZIF-8:DMAc=19:4.5:0:76.5 polymer, co-solvent, β-CD@ZIF-8 Fully mix and dissolve nanoparticles and organic solvents to prepare polymer spin-coating liquid;

[0038] (4) Spin coating film formation: with nitrogen as protective gas, the polymer spin coating solution prepared in step (3) is passed through the spin coating device with the first gradient: 3500rpm, 7s; the second gradient: 4000rpm, 3s; the second gradient: 4000rpm, 3s; Three gradients: 5000rpm, 5s; The fourth gradient: 6000rpm, 5s The spin coating speed of four gradients is that the polyimide nanofiber described in step (1) is coated on the support layer by the spin coating solution, and immersed in deionized Hydrogel bath, film formation by solvent exchange;

[0039] (5) Steps (5) to (6) are the same as in Example 1;

Embodiment 3

[0041] (1) Using polyimide nanofibers as the supporting layer, firstly pretreat it: rinse repeatedly with isopropanol and soak for 24 hours, then rinse with isopropanol again after taking it out, and place it in the air until it is completely dry;

[0042] (2) Steps (2) to (4) are the same as in Example 2;

[0043] (5) Preparation of dense layer containing nanoparticles: prepared in step (4) by using 2.0% (w / v) m-phenylenediamine as the water phase and 0.15% (w / v) m-benzenetricarboxylic acid chloride as the oil phase monomer solution The interfacial polymerization was carried out on the membrane to prepare a dense layer of nanoparticles; the concentration of β-CD@ZIF-8 nanoparticles in the monomer solution was 0.05% (w / v);

[0044] (6) Step (6) is the same as in Example 1.

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Abstract

The invention discloses a double-layer polyamide solvent-resistant nanofiltration membrane containing β-CD@ZIF-8 nanoparticles and a preparation method thereof. The preparation method comprises the following steps: pretreating polyimide nanofibers as a support layer; Preparation of β-CD@ZIF-8 nanoparticles; preparation of a polymer spin coating solution; spin coating to form a film; preparation of a dense layer containing nanoparticles, and finally obtaining the solvent-resistant double-layer polyamide containing β-CD@ZIF-8 nanoparticles Nanofiltration. The advantages of the present invention are: the film prepared by spin coating is uniform in thickness, the bonding force between the separation layer and the support layer is strong, the solvent resistance of the film is excellent, the film has excellent permeability to different solvent molecules and has good performance for different solutes. The selectivity is of practical value in the process of processing solvents.

Description

technical field [0001] The invention relates to the synthesis of a solvent-resistant nanofiltration membrane, in particular to a double-layer polyamide solvent-resistant nanofiltration membrane containing β-CD@ZIF-8 nanoparticles and a preparation method thereof. Background technique [0002] In recent years, solvent-resistant nanofiltration membranes have been widely used in pharmaceutical purification, dye retention, process catalysis, food processing, and petrochemical industries as a "green technology". Most commercial solvent-resistant nanofiltration membranes use polyimide (P84 and 5218) was prepared by non-solvent-induced phase inversion method and further interfacial polymerization. However, due to the use of hexamethylenediamine for cross-linking during its preparation, the solvent permeability gradually decreases during operation. Therefore, the current goal of developing new solvent-resistant nanofiltration is still to reduce the impact of the "tradeoff" effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D69/12B01D71/56B01D67/00
CPCB01D69/02B01D69/125B01D71/56B01D67/0002B01D61/027B01D2325/023B01D2325/30
Inventor 许振良徐孙杰沈倩张海珍池相宇李宇璇
Owner EAST CHINA UNIV OF SCI & TECH
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