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Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF

A composite polyamide membrane and in-situ growth technology, which is applied in the field of nanofiltration membranes, can solve the problems of weak combination of nanoparticles and polyamide layers, easy falling off, and decreased salt interception rate of nanofiltration membranes, achieving good salt interception rate , reduced thickness, high water flux effect

Pending Publication Date: 2022-03-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such doped nanoparticles are not firmly combined with the polyamide layer, and are easy to fall off. At the same time, a large number of ZIF nanoparticles will agglomerate, resulting in a decrease in the salt interception rate of the nanofiltration membrane.

Method used

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  • Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF
  • Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF
  • Method for preparing nanofiltration membrane based on polyolefin composite polyamide membrane in-situ growth ZIF

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take a polyethylene porous membrane with a thickness of 9 μm as the support layer, weigh 0.075g of trimesoyl chloride and dissolve it in 100mL of n-hexane, contact one side of the polyethylene porous bottom membrane with the trimesoyl chloride solution for 4min and then dry it in the air , forming an organic phase layer.

[0034] (2) Weigh 0.1 g of piperazine and dissolve it in 100 mL of deionized water, contact the side of the membrane obtained in step (1) in contact with the organic phase with the monomer of the aqueous phase for 1 min, and then dry it.

[0035] (3) Weigh 0.594g Zn(NO 3 )·6H 2 O was dissolved in 100mL deionized water, and the membrane obtained in step (2) was mixed with Zn(NO 3 )·6H 2 After contacting the O solution for 1 min, bake in an oven at 60°C for 15 min.

[0036] (4) Weigh 1.48g of 2-methylimidazole and dissolve it in 150mL of methanol, soak the membrane obtained in step (3) in the solution for 1 hour, take out the methanol, wash it an...

Embodiment 2

[0039] (1) Take a polyethylene porous membrane with a thickness of 9 μm as the support layer, weigh 0.075g of trimesoyl chloride and dissolve it in 100mL of n-hexane, contact one side of the polyethylene porous bottom membrane with the trimesoyl chloride solution for 4min and then dry it in the air , forming an organic phase layer.

[0040] (2) Weigh 0.1 g of piperazine and dissolve it in 100 mL of deionized water, contact the side of the membrane obtained in step (1) in contact with the organic phase with the monomer of the aqueous phase for 1 min, and then dry it.

[0041] (3) Weigh 1.188g Zn(NO 3 )·6H 2 O was dissolved in 100mL deionized water, and the membrane obtained in step (2) was mixed with Zn(NO 3 )·6H 2 After contacting the O solution for 1 min, bake in an oven at 60°C for 15 min.

[0042] (4) Weigh 1.48g of 2-methylimidazole and dissolve it in 150mL of methanol, soak the membrane obtained in step (3) in the solution for 1 hour, take out the methanol, wash it an...

Embodiment 3

[0045] (1) Take a polyethylene porous membrane with a thickness of 16 μm as the support layer, weigh 0.075g of trimesoyl chloride and dissolve it in 100mL of n-hexane, contact one side of the polyethylene porous bottom membrane with the trimesoyl chloride solution for 4min and then dry it in the air , forming an organic phase layer.

[0046] (2) Weigh 0.1 g of piperazine and dissolve it in 100 mL of deionized water, contact the side of the membrane obtained in step (1) in contact with the organic phase with the monomer of the aqueous phase for 1 min, and then dry it.

[0047] (3) Weigh 1.782g Zn(NO 3 )·6H 2 O was dissolved in 100mL deionized water, and the membrane obtained in step (2) was mixed with Zn(NO 3 )·6H 2 After contacting the O solution for 1 min, bake in an oven at 60°C for 15 min.

[0048] (4) Weigh 1.48g of 2-methylimidazole and dissolve it in 150mL of methanol, soak the membrane obtained in step (3) in the solution for 1 hour, take out the methanol, wash it a...

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Abstract

The invention discloses a method for preparing a nanofiltration membrane by in-situ growth of ZIF based on a polyolefin composite polyamide membrane, a single-layer polyolefin porous membrane is used for replacing a traditional polyester non-woven fabric and polysulfone ultrafiltration layer two-layer structure as a supporting layer, the thickness and preparation cost of the membrane can be greatly reduced, and in addition, the thickness and preparation cost of the membrane can be greatly reduced by adopting reversed-phase interfacial polymerization in-situ growth of ZIF nanoparticles. The ZIF nanoparticles can provide a special water channel, so that the water flux of the nanofiltration membrane is improved under the condition that the salt rejection rate is not lost; the prepared nanofiltration membrane has high water flux and good salt rejection rate, and is mainly applied to the fields of water treatment, seawater desalination, sewage treatment, dye purification and the like.

Description

technical field [0001] The invention relates to the field of nanofiltration membranes, in particular to a method for preparing nanofiltration membranes based on in-situ growth of ZIF on polyolefin composite polyamide membranes. Background technique [0002] Nanofiltration membranes have developed rapidly since the 1980s, and most traditional nanofiltration membranes use ultrafiltration membranes as the support layer. This ultrafiltration membrane is often composed of two layers: one layer is polyester non-woven fabric; the other layer is polyacrylonitrile, polysulfone, polyethersulfone, polyvinylidene fluoride, polyvinyl chloride ultrafiltration layer. Interfacial polymerization was then carried out on this ultrafiltration membrane to attach a polyamide separation layer. There are many problems in the traditional nanofiltration membrane preparation, such as cost, process, quality and so on. Polyester non-woven fabrics and the ultrafiltration layer coated on them account fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/26B01D71/56
CPCB01D61/027B01D67/0006B01D67/0002B01D69/12B01D71/56B01D71/26Y02A20/131
Inventor 薛立新王庆一陆叶强张秀敏马俊梅
Owner ZHEJIANG UNIV OF TECH