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A kind of high flux mixed matrix nanofiltration membrane and preparation method thereof

A mixed matrix, nanofiltration membrane technology, applied in the field of nanofiltration membranes, can solve the problems of uneven film formation, surface defects, and increase the surface area of ​​the separation layer, so as to increase the surface area, improve the water flux, and overcome the interfacial phase. the effect of tolerance

Active Publication Date: 2021-12-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is that there is inhomogeneous film formation in the interface polymerization mode, and the defect on the surface, so that ZIF-8 nanoparticles can be dispersed at the bottom, middle and surface of the nanofiltration membrane layer by the in-situ growth method, so that it can Increase the surface area of ​​the separation layer; at the same time due to the Zn 2+ Can be complexed with aqueous phase monomers, thereby overcoming the interface compatibility problem of inorganic and organic materials

Method used

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  • A kind of high flux mixed matrix nanofiltration membrane and preparation method thereof
  • A kind of high flux mixed matrix nanofiltration membrane and preparation method thereof
  • A kind of high flux mixed matrix nanofiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Film making conditions: 25°C, relative humidity 40%±2.

[0029] (1) Weigh 1.2306g of zinc nitrate hexahydrate and dissolve it in 100ml of deionized water, immerse the support membrane of polysulfone ultrafiltration membrane and zinc nitrate hexahydrate aqueous solution for 4min and then dry it.

[0030] (2) Weigh 0.2502g of piperazine and dissolve it in 100ml of deionized water, put the membrane obtained in step (1) in the water phase monomer for 4min and then dry it to form a water phase liquid layer.

[0031] (3) Weigh 0.1003g of trimesoyl chloride and dissolve it in 100ml of n-hexane, mix the membrane obtained in step (2) with the organic phase solution containing active monomers for 1min, and then bake in an oven at 60°C for 15min.

[0032] (4) Weigh 2.7111g of 2-methylimidazole and dissolve it in 300ml of methanol, soak the membrane obtained in step (3) in the methanol solution containing 2-methylimidazole ligand for 12h, and then soak it in methanol solvent for te...

Embodiment 2

[0037] Film making conditions: 25°C, relative humidity 40%±2.

[0038] (1) Weigh 1.8406g of zinc nitrate hexahydrate and dissolve it in 100ml of deionized water, immerse the support membrane of polysulfone ultrafiltration membrane and zinc nitrate hexahydrate aqueous solution for 4min and then dry it.

[0039] (2) Weigh 0.2502g of piperazine and dissolve it in 100ml of deionized water, put the membrane obtained in step (1) in the water phase monomer for 4min and then dry it to form a water phase liquid layer.

[0040] (3) Weigh 0.1003g of trimesoyl chloride and dissolve it in 100ml of n-hexane, mix the membrane obtained in step (2) with the organic phase solution containing active monomers for 1min, and then bake in an oven at 60°C for 15min.

[0041] (4) Weigh 2.7111g of 2-methylimidazole and dissolve it in 300ml of methanol, soak the membrane obtained in step (3) in the methanol solution containing 2-methylimidazole ligand for 12h, and then soak it in methanol solvent for te...

Embodiment 3

[0045] Film making conditions: 25°C, relative humidity 40%±2.

[0046] (1) Weigh 2.1501g of zinc nitrate hexahydrate and dissolve it in 100ml of deionized water, immerse the support membrane of polysulfone ultrafiltration membrane and zinc nitrate hexahydrate aqueous solution for 4min and then dry it.

[0047] (2) Weigh 0.2502g of piperazine and dissolve it in 100ml of deionized water, put the membrane obtained in step (1) in the water phase monomer for 4min and then dry it to form a water phase liquid layer.

[0048] (3) Weigh 0.1003g of trimesoyl chloride and dissolve it in 100ml of n-hexane, mix the membrane obtained in step (2) with the organic phase solution containing active monomers for 1min, and then bake in an oven at 60°C for 15min.

[0049] (4) Weigh 2.7111g of 2-methylimidazole and dissolve it in 300ml of methanol, soak the membrane obtained in step (3) in the methanol solution containing 2-methylimidazole ligand for 12h, and then soak it in methanol for testing. ...

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Abstract

The invention discloses a high-flux mixed matrix nanofiltration membrane and a preparation method thereof. The polysulfone ultrafiltration membrane support membrane is soaked in an aqueous solution of zinc nitrate hexahydrate for a period of time and then dried; the obtained membrane is mixed with a water phase monomer Dried after soaking in the medium for a period of time to form an aqueous phase liquid layer; wherein the aqueous phase monomer is piperazine; the obtained film is dried in an oven after being contacted with an organic phase solution containing an active monomer for a period of time; wherein the organic phase is active The monomer is trimesoyl chloride; the membrane is soaked in a methanol solution containing 2-methylimidazole ligand for a period of time and then washed with methanol solvent to remove excess ligand. The ZIF-8 nanoparticles in the present invention can be dispersed on the bottom, middle and surface of the nanofiltration membrane layer through the in-situ growth method, so that the surface area of ​​the separation layer can be increased, thereby improving the water flux.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a high-throughput mixed matrix nanofiltration membrane and a preparation method thereof. Background technique [0002] Adding nanoparticles to the nanofiltration functional layer to modify it has many advantages. Adding nanoparticles has the characteristics of simple operation. Nanotechnology as a functional system at the molecular scale has more durable, cleaner and safer products. It has become Now modified nanofiltration membrane is a very important means. The modification of composite membranes by particle filling method has attracted the attention of more and more researchers, and inorganic nanoparticles have also developed from the initial general particle method to nanoparticles that have less damage to the performance of composite membranes, such as: nano-TiO 2 , nano-SiO 2 , NaX, nano-Al 2 o 3 , Nano Ag, ZIF-8 and other nanoparticles. MOF has the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/10B01D71/02B01D69/02B01D67/00B01D61/02
Inventor 薛立新杨文杰高从堦
Owner ZHEJIANG UNIV OF TECH