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Preparation method of high-flux composite nanofiltration membrane

A composite nanofiltration membrane and high-flux technology, applied in the field of membrane separation, can solve problems such as limiting membrane development, achieve the effects of improving permeability and anti-pollution performance, reducing aggregation, and improving hydrophilicity

Active Publication Date: 2020-12-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for TFC membranes, the game phenomenon between permeability and selectivity and high fouling still limit the further development of membranes.

Method used

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  • Preparation method of high-flux composite nanofiltration membrane
  • Preparation method of high-flux composite nanofiltration membrane
  • Preparation method of high-flux composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve carbon nitride quantum dots and polyamines together in deionized water as an aqueous phase solution. The mass concentration of carbon nitride quantum dots is 10g / L, the mass concentration of polyamine is 10g / L, and trimesoyl chloride is dissolved in hexane and configuration mass concentration is the organic phase solution of 0.04%; Polyacrylonitrile ultrafiltration membrane After immersing in the aqueous phase solution for 3 minutes, take out the ultrafiltration membrane to remove excess water on the surface, then immerse the membrane in the organic phase solution for 60 seconds, put it in an oven for heat treatment for 3 minutes, and finally wash the membrane surface with deionized water to remove unreacted monomers to obtain high-throughput composite nanofiltration membranes.

[0025] The scanning electron micrograph of the prepared high-throughput composite nanofiltration membrane surface is as follows: figure 1 Shown; surface atomic force microscope photo ...

Embodiment 2

[0027] Dissolve carbon nitride quantum dots and polyamines together in deionized water as an aqueous phase solution. The mass concentration of carbon nitride quantum dots is 20g / L, the mass concentration of polyamine is 20g / L, and 5-isocyanate isophthaloyl chloride is dissolved in hexane to prepare an organic phase with a mass concentration of 0.5g / L solution; after immersing the polyvinylidene fluoride ultrafiltration membrane in the aqueous phase solution for 15 minutes, take out the ultrafiltration membrane to remove excess water on the surface, then immerse the membrane in the organic phase solution for 100 seconds, put it into the oven for heat treatment for 10 minutes, and finally Wash the surface of the membrane with deionized water to remove unreacted monomers to obtain a high-throughput composite nanofiltration membrane.

Embodiment 3

[0029] Dissolve carbon nitride quantum dots and polyamines together in deionized water as an aqueous phase solution. The mass concentration of carbon nitride quantum dots is 15g / L, the mass concentration of polyamine is 8g / L, and trimesoyl chloride is dissolved in hexane and configuration mass concentration is the organic phase solution of 0.7g / L; After the filter membrane is immersed in the aqueous phase solution for 9 minutes, take out the ultrafiltration membrane to remove excess water on the surface, then immerse the membrane in the organic phase solution for 60 seconds, put it in an oven for heat treatment for 7 minutes, and finally wash the membrane surface with deionized water to remove Unreacted monomers are obtained to obtain high-throughput composite nanofiltration membranes.

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Abstract

The invention relates to a preparation method of a high-flux composite nanofiltration membrane, belonging to the technical field of membrane separation. The preparation method comprises the followingsteps: dissolving carbon nitride quantum dots and polyamine in deionized water together to obtain a water-phase solution; dissolving acyl chloride or isocyanate in hexane as an organic phase solution;and immersing the ultrafiltration membrane into the aqueous phase solution, taking out the ultrafiltration membrane, removing redundant water on the surface of the ultrafiltration membrane, immersingthe ultrafiltration membrane into an organic phase solution, and carrying out heat treatment in an oven to obtain the high-flux composite nanofiltration membrane. The carbon nitride quantum dots areintroduced into the composite nanofiltration membrane, so the flux and interception performance of the nanofiltration membrane are improved, and the anti-pollution capability of the membrane is also improved.

Description

technical field [0001] The invention relates to a preparation method of a high-throughput composite nanofiltration membrane, belonging to the technical field of membrane separation. Background technique [0002] Nanofiltration technology is widely used in seawater desalination because of its simplicity and cheapness. The development of thin-film composite membranes (TFCs) consisting of microporous polymer support membranes and polyamide (PA) selective layers has improved the desalination effect of the membranes. However, for TFC membranes, the game phenomenon between permeability and selectivity and high fouling still limit the further development of membranes. The thin-film composite nanofiltration (TFN) membrane prepared by introducing nanomaterials into the PA selective layer is currently recognized as the most effective method and strategy to solve the above problems. Compared with traditional TFC membranes, TFN membranes have excellent separation characteristics. In ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D71/42B01D71/34B01D61/02
CPCB01D61/027B01D69/02B01D69/12B01D71/34B01D71/42B01D2323/02B01D2325/36
Inventor 张春芳张硕李明慧姚铮白云翔董亮亮
Owner JIANGNAN UNIV
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