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Fouling-resistant antibacterial composite forward-osmosis membrane with positive surface charges and preparation method therefor

A forward osmosis membrane and anti-pollution technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the problems of poor anti-pollution performance and inability to effectively inhibit bacterial growth and reproduction, and achieve High charge density, improved anti-biological fouling ability, and improved hydrophilicity

Inactive Publication Date: 2018-12-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a positively charged surface-charged anti-pollution antibacterial composite forward osmosis membrane and a preparation method thereof. The anti-pollution performance of the existing forward osmosis membrane is poor, and the growth and reproduction of bacteria on the surface of the membrane cannot be effectively inhibited.

Method used

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  • Fouling-resistant antibacterial composite forward-osmosis membrane with positive surface charges and preparation method therefor
  • Fouling-resistant antibacterial composite forward-osmosis membrane with positive surface charges and preparation method therefor
  • Fouling-resistant antibacterial composite forward-osmosis membrane with positive surface charges and preparation method therefor

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Experimental program
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Effect test

Embodiment 1

[0049] The preparation method of PEI graft modified film is:

[0050] 1) Polysulfone (Psf) is used as base membrane material, N,N-dimethylacetamide (DMAc) is used as organic solvent, and polyethylene glycol (PEG400) is used as porogen. Prepare the casting solution according to the mass ratio of Psf, DMAc, and PEG400 of 18:74:8, and form the casting solution after stirring at 65°C for 12 hours;

[0051] 2) The casting solution is left to stand for 24 hours, and defoaming: the defoaming temperature is 30°C.

[0052] 3) Prepare glass plate, scraper, thermometer, alcohol and alcohol cotton. Control the temperature of the glass plate and the scraper at 30° C. in an oven, clean the glass plate and the scraper, and adjust the thickness of the scraper (150 μm). Control air humidity to 40%-60%;

[0053] 4) Wipe the glass plate and scraper with alcohol cotton, pour the prepared film casting solution on the glass plate and scrape evenly, then quickly place it in a water bath at 30°C f...

Embodiment 2

[0058] The preparation method of PEI-AgNPs composite forward osmosis membrane is:

[0059] 1) Polysulfone (Psf) is used as base membrane material, N,N-dimethylacetamide (DMAc) is used as organic solvent, and polyethylene glycol (PEG400) is used as porogen. Prepare the casting solution according to the mass ratio of Psf, DMAc, and PEG400 of 18:74:8, and form the casting solution after stirring at 65°C for 12 hours;

[0060] 2) The casting solution is left to stand for 24 hours, and defoaming: the defoaming temperature is 30°C.

[0061] 3) Prepare glass plate, scraper, thermometer, alcohol and alcohol cotton. Control the temperature of the glass plate and the scraper at 30° C. in an oven, clean the glass plate and the scraper, and adjust the thickness of the scraper (150 μm). Control air humidity to 40%-60%;

[0062] 4) Wipe the glass plate and scraper with alcohol cotton, pour the prepared film casting solution on the glass plate and scrape to form a film, then quickly place...

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Abstract

The invention relates to a fouling-resistant antibacterial composite forward-osmosis membrane with positive surface charges and a preparation method therefor. The osmotic membrane is a PEI-AgNPs composite forward osmosis membrane. The method comprises the steps: soaking a Psf-based membrane in a m-phenylenediamine solution, removing a surface remaining solution after a period of time, submerging the membrane into a trimesoyl chloride solution, carrying out a reaction, and then, removing a solution from the surface of the membrane; adding a certain volume of PEI aqueous solution to the surfaceof the membrane, and removing liquid droplets from the surface of the membrane after a reaction is completed; and carrying out treatment for 3min at the temperature of 95 DEG C, taking out the membrane, then, soaking the membrane into nano-silver colloid with certain concentration, and carrying out a reaction for a period of time, thereby obtaining the novel forward osmosis membrane. According tothe PEI-AgNPs composite forward osmosis membrane disclosed by the invention, the surface has the positive charges, so that the membrane has relatively high water flux and salt interception rate and meanwhile has excellent antipollution and antibacterial performance.

Description

technical field [0001] The invention belongs to the field of forward osmosis membranes and preparation thereof, in particular to a positively charged surface-charged anti-pollution antibacterial composite forward osmosis membrane and its preparation. Background technique [0002] Forward osmosis technology has been widely used in seawater desalination, oil and gas field produced water treatment, underground brackish water irrigation, surfactant wastewater and other high-salt wastewater fields due to its low energy consumption, simple operation, and high water recovery rate. Composite forward osmosis membranes are widely used in the above-mentioned high-salt wastewater treatment due to their large water flux, high salt rejection rate and wide pH range. However, these wastewaters often contain a large amount of metal ions such as Ca 2+ , Fe 3+ Positively charged pollutants such as cationic surfactants and cationic surfactants. Therefore, if the forward osmosis technology is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/78B01D67/00B01D69/02C02F1/44
CPCB01D67/0079B01D69/02B01D71/68B01D71/78B01D2325/26B01D2325/48C02F1/445
Inventor 陈刚徐波黄满红
Owner DONGHUA UNIV
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