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Preparation method and application of anti-pollution polyethersulfone membrane

A polyethersulfone membrane and anti-pollution technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of flux failure and weak anti-pollution ability, and achieve simple preparation method and oil drop resistance Strong pollution ability and high retention rate

Inactive Publication Date: 2016-06-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The purpose of this invention is to provide a method for preparing a surface-grafted polydimethylsiloxane anti-fouling polyethersulfone membrane, and to construct an amphiphilic advanced membrane embedded with a hydrophilic region and a non-polar low surface energy region. Membrane surface to solve the problem of weak anti-fouling ability and easy to suffer from severe flux failure of traditional polyethersulfone membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Dissolve 4.0g of polyethersulfone in 36.0g of N,N-dimethylacetamide, stir at 60°C for 12 hours, scrape the film after defoaming for 6 hours, put it in the air for 15s, and put it in 25°C Coagulate in a water bath to form a film to obtain a polyethersulfone-based membrane, which is rinsed with deionized water repeatedly before use. Dissolve 0.05 g of dopamine in 100 ml of barbital sodium-hydrochloric acid buffer solution with pH=7.2, immerse the above-prepared polyethersulfone membrane filter side down, react at 30°C for 12 hours, take out the membrane and rinse it with deionized water to obtain Polyethersulfone membrane with polydopamine molecular layer grafted on the surface. Take 0.1g of amodimethicone (NH 2 -PDMS-NH 2 , with a molecular weight of 1000) was dissolved in 100ml ethanol to make a solution with a concentration of 1.0g / L, and a polyethersulfone membrane grafted with a polydopamine molecular layer on the surface was placed in it, and the membra...

Embodiment 2

[0022] Example 2: Dissolve 5.2g of polyethersulfone in 34.8g of N,N-dimethylacetamide, stir for 12 hours at 60°C, scrape the film after defoaming for 6h, put it in the air for 15s, and put it in 25°C Coagulate in a water bath to form a film to obtain a polyethersulfone-based membrane, which is rinsed with deionized water repeatedly before use. Dissolve 0.2 g of dopamine in 100 ml of tris-hydrochloric acid buffer solution with pH=8.5, immerse the polyethersulfone membrane prepared above with the filter side down, react at 40°C for 6 hours, take out the membrane and rinse it with deionized water , to obtain a polyethersulfone membrane with a polydopamine molecular layer grafted on the surface. Take 0.3g of amodimethicone (NH 2 -PDMS-NH 2 , with a molecular weight of 2500) was dissolved in 100ml ethanol to make a solution with a concentration of 3.0g / L, and a polyethersulfone membrane grafted with a molecular layer of polydopamine on the surface was placed in it, and the membra...

Embodiment 3

[0023] Example 3: Dissolve 5.2g of polyethersulfone in 34.8g of N,N-dimethylacetamide, stir at 60°C for 12h, scrape the film after defoaming for 6h, put it in the air for 15s, and put it in 25°C Coagulate in a water bath to form a film to obtain a polyethersulfone-based membrane, which is rinsed with deionized water repeatedly before use. Dissolve 0.4g of dopamine in 100ml of tris-hydrochloric acid buffer solution with pH=8.5, immerse the polyethersulfone membrane prepared above with the filter side down, react at 40°C for 3h, take out the membrane and rinse it with deionized water , to obtain a polyethersulfone membrane with a polydopamine molecular layer grafted on the surface. Take 0.4g of amodimethicone (NH 2 -PDMS-NH 2 , with a molecular weight of 2500) was dissolved in 100ml ethanol to make a solution with a concentration of 4.0g / L, and the polyethersulfone membrane grafted with a polydopamine molecular layer on the surface was placed in it, and the membrane was taken ...

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Abstract

The invention relates to a preparation method and application of an anti-pollution polyethersulfone membrane grafted with polydimethylsiloxane on the surface. The preparation of the membrane material is completed through the following three steps, that is, the polyethersulfone base membrane is first prepared by the immersion precipitation phase inversion method; then a highly reactive polydopamine molecular layer is grafted on its surface; The active quinone group on the dopamine molecular layer and the amino-terminated polydimethylsiloxane undergo Michael addition reaction to prepare the polyethersulfone membrane grafted with polydimethylsiloxane (PDMS) on the surface. The preparation method of the membrane material is simple and does not require harsh reaction conditions. When treating oil-water emulsions, the rejection rate is as high as 100%, the flux depletion rate can be reduced to 13.9%, and the flux recovery rate is as high as 94.0%. It has a wide range of applications in the field of oily sewage treatment. application prospects.

Description

technical field [0001] The invention relates to a method for preparing a surface-grafted polydimethylsiloxane anti-pollution polyethersulfone membrane, which belongs to the technical field of membrane surface modification. The surface-modified polyethersulfone membrane has anti-oil drop pollution and low flux The effect of exhaustion. Background technique [0002] With the rapid development of industry, a large amount of oil (crude oil, organic matter, etc.) enters the water body every day, forming oily sewage. Taking the oil extraction industry as an example, the world discharges an average of 250 to 1 billion barrels of oily sewage every day. If it is discharged directly without treatment, it will cause serious environmental pollution. It will not only deteriorate the water body, destroy water resources, affect the growth of crops, but also threaten the survival of wild animals and human health. Compared with the many disadvantages of traditional oily sewage treatment me...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/60B01D67/00
CPCB01D67/0006B01D71/60B01D71/68B01D2323/38
Inventor 周建成殷俊王苑婷许景程李乃旭李璟
Owner SOUTHEAST UNIV
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