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Polyamide composite membrane high-flux modification method based on ether free radicals

A technology of polyamide and free radicals, which is applied in the field of modification to improve the water flux and anti-pollution performance of polyamide composite reverse osmosis membranes and nanofiltration membranes, and can solve the problem of limited improvement in the properties of polyamide composite membranes and insufficient graft layers Uniformity and density, limited number of active groups, etc., to achieve the effect of improving water flux, not easy to pollute, and easy to operate

Active Publication Date: 2022-04-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the thickness of chemical grafting is lower than that of physical coating, which has little effect on the water flux of the membrane, as the grafting reaction site, the remaining active groups on the membrane surface are limited, so the graft formed by the macromolecular hydrophilic polymer The branch layer is not uniform and dense enough, and the improvement of the properties of the polyamide composite membrane is limited

Method used

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  • Polyamide composite membrane high-flux modification method based on ether free radicals
  • Polyamide composite membrane high-flux modification method based on ether free radicals

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Select the polyamide composite reverse osmosis membrane from Dow Filmtec Company in the United States, immerse it in the modification solution, and modify it at 50°C for 1h. The modification solution includes: 5mmol / L sodium persulfate, 2mol / L methyl ether aqueous solution. After the modification solution was preheated to 50°C, the polyamide composite membrane was added, and the membrane was removed after modification for 1 hour, washed repeatedly with a large amount of deionized water, and then tested.

[0025] The membrane that was not treated with the modifying solution was the comparative membrane.

[0026] The test conditions of water flux and desalination rate are: operating pressure 16bar, flow rate 4LPM, pre-pressing the modified membrane and the comparison membrane with ultra-pure water at 25°C for 8h to stabilize the membrane performance, adjust the operating pressure to 14bar, and measure the modified membrane and the water flux of the comparison membrane. ...

Embodiment 2

[0028] Select the polyamide composite reverse osmosis membrane from Zhongke Ruiyang Membrane Technology (Beijing) Co., Ltd., immerse it in the modification solution, and modify it at 70°C for 0.5h. The modification solution includes: 2mmol / L potassium hydrogen persulfate compound salt, 2mol / L methyl ether aqueous solution. After the modification solution was preheated to 70°C, the polyamide composite membrane was added, and the membrane was taken out after modification for 0.5h, washed repeatedly with a large amount of deionized water, and then tested.

[0029] The membrane that was not treated with the modifying solution was the comparative membrane.

[0030] The test conditions of water flux and salt rejection rate are as described in Example 1.

Embodiment 3

[0032] Select the polyamide composite reverse osmosis membrane self-developed by the inventor, immerse it in the modified solution, at a wavelength of 254nm, 800mJ / cm 2 Under the condition of luminous flux, UV irradiation modification was carried out for 1h. The modification solution includes: 1 mmol / L potassium hydrogen persulfate compound salt, 5 mol / L 1,4-dioxane aqueous solution. Turn on the UV lamp for 10 minutes and wait for the light to stabilize, then add polyamide composite membrane, take out the membrane after modification for 1 hour, wash it repeatedly with a large amount of deionized water, and then test it.

[0033] The membrane that was not treated with the modifying solution was the comparative membrane.

[0034] The test conditions of water flux and salt rejection rate are as described in Example 1.

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Abstract

The invention relates to a polyamide composite membrane high-flux modification method based on ether free radicals, and aims to remarkably improve the water flux and pollution resistance of reverse osmosis and nanofiltration membranes. According to the method disclosed by the invention, the polyamide composite membrane is modified by using the modification solution containing ether free radicals generated by the oxidant and the hydrophilic ether organic matter, and hydrophilic and electrically neutral ether small molecules are grafted on the surface of the membrane, so that the hydrophilicity of the surface of the membrane is improved, and the water flux and the anti-pollution capacity of the membrane are synchronously improved. The method provided by the invention has the characteristics of simple operation, low modification cost and green and environment-friendly modification method, and is suitable for the high-salinity water treatment fields such as seawater / brackish water desalination and industrial wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane water treatment, in particular to a modification method for improving the water flux and anti-pollution performance of polyamide composite reverse osmosis membranes and nanofiltration membranes. Background technique [0002] In recent years, the increasingly prominent water shortage and water pollution have posed serious threats to human health and social development. Membrane technology is widely used in water purification and seawater desalination due to its high separation efficiency, low energy consumption, wide application range, and easy operation and management. At present, polyamide composite membrane, as the mainstream membrane material, has received widespread attention in the production and application of reverse osmosis and nanofiltration membrane products around the world. However, due to its own characteristics, polyamide membranes still face the problems of mutual restraint of wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/56B01D61/10C02F1/44
CPCY02A20/131
Inventor 程巍张涛王丽红
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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