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Nanofiltration membrane prepared based on electrostatic enhanced reaction surface segregation method and application thereof

A nanofiltration membrane and reaction technology, which is applied in the field of anti-pollution nanofiltration membrane preparation, can solve problems such as shortened service life, membrane fouling, and sharp drop in flux

Active Publication Date: 2021-09-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The pollutants in the wastewater will block the membrane pores and form a filter cake layer on the membrane surface, causing serious membrane fouling, leading to serious problems such as a sharp decrease in flux, increased energy consumption, frequent cleaning, and shortened service life.

Method used

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  • Nanofiltration membrane prepared based on electrostatic enhanced reaction surface segregation method and application thereof
  • Nanofiltration membrane prepared based on electrostatic enhanced reaction surface segregation method and application thereof
  • Nanofiltration membrane prepared based on electrostatic enhanced reaction surface segregation method and application thereof

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preparation example Construction

[0019] The present invention proposes a method for preparing nanofiltration membranes based on surface segregation of electrostatically enhanced reactions. Forms a hydration layer that prevents the membrane surface from interacting with organic pollutants. Electrostatically induced hydration has 7 times higher water absorption than hydrogen bond induced hydration. Therefore, ionized groups on the membrane surface can provide strong hydration to form a hydration layer that inhibits pollutants from reaching the membrane surface. Surface segregation is a simple in-situ modification method, and charged hydrophilic groups can be enriched on the membrane surface during phase separation. The enrichment effect of charged hydrophilic groups can be further enhanced by adding reactants that have strong electrostatic interactions with the segregation agent in the coagulation bath. In the method for preparing the nanofiltration membrane of the present invention, the anti-pollution modifi...

Embodiment 1

[0054] Embodiment 1, preparation example separation membrane 1, its preparation steps are as follows:

[0055] Step 1, 5.33g Pluronic F127 and 4.812mL methacryloxyethyltrimethylammonium chloride (molar ratio is 64) are dissolved in 80mL of deionized water; Add cerium ion initiator, and in nitrogen Stir at high speed under the atmosphere, carry out the polymerization reaction at 60°C for 8 hours, and obtain a positively charged quaternary ammonium salt modified polymer after dialysis, labeled as F127-Q 64 .

[0056] Step 2, 800mg of FR921-2 polyvinylidene fluoride, 400mg of F127-Q prepared in step 1 64 and 3200 mg of dimethyl sulfoxide were added to a round bottom flask, heated and stirred in a water bath at 60°C for 8 hours, and then statically defoamed for 2 hours to obtain a casting solution.

[0057] Step 3: Add 1% negatively charged aqueous solution of polysulfonic acid into the container, and ultrasonically sonicate for 0.5 hours until fully dissolved to prepare a negat...

Embodiment 2

[0060] Embodiment 2, preparation embodiment separation membrane 2, its preparation process is basically the same as embodiment 1, difference only is: in step 3, the mass percentage of described negatively charged polysulfonic acid aqueous solution is changed from 1% to 2% , and the final nanofiltration membrane is denoted as anti-fouling separation membrane 2.

[0061] The pure water specific flux of embodiment separation membrane 2 is 121Lm -2 h -1 bar -1 ; Alcian blue, Congo red and methylene blue rejection rates were 99.9%, 99.7% and 97.6%; Zeta potential 13.7mV; underwater oil contact angle 167.3°; anti-pollution index FRR, DRt, DRr and DRir were 98.2 %, 2.2%, 0.33% and 1.8%.

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Abstract

The invention discloses a method for preparing a nanofiltration membrane based on electrostatic enhanced reaction surface segregation. The method mainly comprises the steps of preparing a quaternary ammonium salt modifier with positive charges by adopting an emulsion polymerization method initiated by an oxidation-reduction cerium salt system; then dissolving a modifier and a film-forming polymer in a solvent, stirring and heating to prepare a film-forming solution; and finally, adding a negatively charged polysulfonic acid solution into the coagulating bath, and preparing the anti-pollution dye separation membrane through a non-solvent induced phase inversion method. The preparation method has the main advantages that the surface property of the selective separation layer can be adjusted by adjusting the number of quaternary ammonium salt monomers in the modifier and the concentration of polysulfonic acid in the coagulating bath; the separation membrane prepared by the method has underwater super-oleophobicity and super-strong anti-pollution performance; the membrane prepared by the method has good dye separation performance; and the dye separation active layer can be constructed and the anti-pollution performance of the membrane surface can be realized simultaneously in the phase inversion process.

Description

technical field [0001] The invention relates to a method for preparing an anti-pollution dye separation membrane by electrostatically enhanced reaction surface segregation, and belongs to the technical field of preparation of anti-pollution nanofiltration membranes. Background technique [0002] The shortage of water resources and the deterioration of water quality are common challenges faced by mankind in the 21st century. It is estimated that 80% of the waste water in the world is directly discharged without treatment, causing great damage to the environment and ecology, and also causing serious waste of resources. Among them, dye wastewater contains benzene series, naphthalene series, anthraquinone, aniline, benzidine, metals, salts and other compounds, which have the characteristics of "three highs" of high chemical oxygen demand, high chroma and high toxicity, and are harmful to biological Carcinogenic, teratogenic, and mutagenic threats are "three causes", and it is o...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02C02F1/44C02F101/30
CPCB01D67/0002B01D67/0011B01D67/0016B01D69/02C02F1/442B01D2323/40B01D2325/36B01D2323/02C02F2101/308Y02A20/131
Inventor 姜忠义龙梦影张润楠吴洪杨焯游昕达袁锦秋关景元
Owner TIANJIN UNIV
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