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A kind of high-strength, pollution-resistant composite reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane and anti-pollution technology, which is applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of poor membrane performance, poor dispersion of carbon nanotubes, and coating layer peeling off, etc. Achieve high mechanical strength and stability, uniform porosity distribution, and effective hydrophilic properties

Active Publication Date: 2021-08-17
JIANGSU LONGMEM ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN109876674A applied for a method of adding acidified carbon nanotubes to the aqueous phase solution, and coating the surface of the reverse osmosis membrane with dopamine and silver to modify the performance of the reverse osmosis membrane, although adding carbon nanotubes improves the strength and flux of the membrane , but there is no interaction between the acidified carbon nanotubes and the subsequent coating of dopamine and silver. With subsequent use, the coating layer will fall off and the dispersion of carbon nanotubes will deteriorate, which will lead to poor film performance.
[0006] CN106268379B applied for a modified acyl chloride graphene oxide coated on the surface of the reverse osmosis membrane, which improved the flux and antibacterial performance of the reverse osmosis membrane, but the falling off of the graphene layer is also one of the follow-up problems. When the graphene layer Gradually falling off, the flux and antibacterial performance of the reverse osmosis membrane deteriorate
The application of carbon nanowires in the field of reverse osmosis membrane manufacturing has not been found so far

Method used

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  • A kind of high-strength, pollution-resistant composite reverse osmosis membrane and preparation method thereof
  • A kind of high-strength, pollution-resistant composite reverse osmosis membrane and preparation method thereof
  • A kind of high-strength, pollution-resistant composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Add carbon nanowires into a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, heat and ultrasonicate at 60°C for 4 hours, then repeatedly wash with deionized water and centrifuge until the pH value is 7, then dry at 70°C to obtain acidification carbon nanowires.

[0026] The polysulfone ultrafiltration membrane (PSF) cleaned with isopropanol was immersed in the aqueous phase solution with a pH value of 8 for 30s, in which polyetherimide modified carbon nanowires (0.5wt%), m-phenylenediamine ( 2.5wt%), triethylamine (0.2wt%), camphorsulfonic acid (0.3wt%), after the excess solution was removed by a rubber roller, immersed in the oil phase solution for 60s, wherein trimesoyl chloride (0.07wt%), solvent It is n-hexane, and after taking it out, it is heat-treated at 70°C for 10 minutes to obtain a high-strength composite reverse osmosis membrane;

Embodiment 2

[0028] Except that the carbon nanowire content was replaced by 1 wt%, other conditions were the same as in Example 1, and a high-strength composite reverse osmosis membrane was obtained.

Embodiment 3

[0030] Except that the content of carbon nanowires was replaced by 2 wt%, other conditions were the same as in Example 1, and a high-strength composite reverse osmosis membrane was obtained.

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Abstract

The invention relates to a preparation method and application of a high-strength, pollution-resistant composite reverse osmosis membrane. The invention synthesizes aminated carbon nanowires, fixes the nanowires in the reverse osmosis membrane, and utilizes the high strength and amino acids of the amino carbon nanowires. The reactivity of m-phenylenediamine (MPD) ‑ trimesoyl chloride (TMC) and aminated carbon nanowires ‑ trimesoyl chloride (TMC) double cross-linked layer, which greatly increases the stability and mechanical properties of the desalination layer. At the same time, the excellent dispersion performance, abundant hydrophilic amino groups and large specific surface area of ​​aminated carbon nanowires also improve the flux and desalination performance of reverse osmosis. The test results also show that the reverse osmosis membrane prepared by the present invention has higher mechanical strength, flux and desalination performance than the existing reverse osmosis membrane.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a preparation method and application of a high-strength, pollution-resistant composite reverse osmosis membrane. Background technique [0002] With the progress of society, people pay more and more attention to water resources. Reverse osmosis membrane is one of the most widely used separation membrane products with the best application effect in the field of separation membrane. [0003] The interfacial polymerization method is currently the most important method for preparing reverse osmosis composite membranes. The polysulfone support layer is used as the base membrane, and a dense polyamide desalination layer is formed on the polysulfone support layer through the mutual reaction between two active monomers, polyacyl chloride and polyamide. Although reverse osmosis membranes are widely used, the structure of the current reverse osmosis membrane results in lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D61/02B01D67/00C02F1/44
CPCB01D61/025B01D67/0079B01D69/12C02F1/441Y02A20/131
Inventor 沈娟赵宇辰王薇
Owner JIANGSU LONGMEM ENVIRONMENTAL TECH CO LTD
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