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Ultrafiltration membrane with hydrophilism and antibacterial property and preparation method thereof

An ultrafiltration membrane and antibacterial technology, applied in the field of ultrafiltration membrane and its preparation, can solve the problems of reduced anti-fouling performance of membrane, poor dispersion of nano-silver, loss of silver particles, etc., and achieve excellent anti-protein adsorption and antibacterial ability, dispersion Good performance and loss reduction effect

Inactive Publication Date: 2013-06-12
LISHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the poor dispersion of nano-silver in the polymer casting liquid, it is easy to agglomerate, and there is a problem of silver particle loss during the membrane preparation and membrane operation process, and the anti-pollution performance of the membrane decreases with the extension of the operation time.

Method used

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  • Ultrafiltration membrane with hydrophilism and antibacterial property and preparation method thereof
  • Ultrafiltration membrane with hydrophilism and antibacterial property and preparation method thereof
  • Ultrafiltration membrane with hydrophilism and antibacterial property and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 104.2 g of tetraethyl orthosilicate was added to a solution consisting of 18 g of pure water and 1000 mL of absolute ethanol, stirred evenly, and then 98 g of ammonia water was added as a catalyst, and the whole reaction was carried out under stirring for 12 hours. After the reaction, the resulting solution was dried at about 80 °C, ground and sieved to obtain silica powder. Take 3 grams of silica powder and disperse it in 500 mL of pure water, add 1.5 grams of AgNO 3 and 7.2 grams of ammonia water, reacted for 12 h under stirring, centrifuged, washed several times with absolute ethanol, centrifuged, and dried at room temperature to obtain Ag-SiO 2 Antibacterial agents.

Embodiment 2

[0039] 0.5 g of Ag-SiO prepared according to Example 1 2Add 4 g polyethylene glycol-400 to 77.5 g N,N-dimethylacetamide, stir well, then add 18 g polyethersulfone, dissolve the mixture at 60 °C, and heat at 70 °C Degassing to obtain casting solution. A certain amount of casting liquid was scraped onto the non-woven fabric with a scraper, and the thickness of the film was controlled to 0.25 mm by a feeler gauge, and then entered into a coagulation bath to solidify to form a film. The prepared membrane was placed in pure water for more than 24 h to completely remove excess organic solvent. At a pressure of 0.1 MPa, the membrane has a pure water flux of 221 L / m 2 h, the rejection rate to 1g / L BSA is 98%. The surface contact angle of the composite membrane measured by a contact angle measuring instrument is 52.6°, indicating that it has good hydrophilicity, and the 24-hour protein adsorption amount on the membrane surface is only 41.2ug / m3 measured with 1g / L BSA solution 2 . ...

Embodiment 3

[0041] Polyvinylidene fluoride (PVDF) was used as the membrane material, N,N-dimethylformamide (DMF) was used as the organic solvent, and polyvinylpyrrolidone (PVP) was used as the porogen to prepare the antibacterial membrane. Concrete steps are as follows, the Ag-SiO that 1g makes according to example 1 2 and 4 g of PVP were dissolved in 77 g of DMF, then 18 g of PVDF was added, stirred at a certain temperature to dissolve it; and heated at 70 °C for defoaming. Spread a certain amount of casting solution on the non-woven fabric with a scraper, and form a film by phase inversion method. The prepared membrane was placed in tap water for more than 24 h to completely remove the organic solvent in the membrane. The newly prepared antibacterial film was used to measure its antibacterial performance against Escherichia coli and Pseudomonas aeruginosa. The results showed that the film had good antibacterial performance against both bacteria, and the antibacterial rate was 99%. At ...

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Abstract

The invention relates to an ultrafiltration membrane and a preparation method thereof, in particular to the ultrafiltration membrane with hydrophilism and antibacterial property and the preparation method thereof. The preparation method of the ultrafiltration membrane comprises the following steps: (1), adding certain amount of antibacterial agents into organic solvent, after completely dispersing, and then adding dry polymer, dissolving in the organic solvent, and adding a pore-foaming agent, stirring and dissolving the pore-foaming agent in constant temperature, forming polymer / solvent / pore-foaming agent ternary membrane casting solution, closely standing and defoaming at certain temperature, and acquiring the required membrane casting solution; (2), using a phase converting method to manufacture membranes, after filtering the membrane casting solution which is completely defoamed, using a membrane-scraping device to scrape on non-woven fabrics, using the phase converting method to form the membranes, and preserving the membranes in a wet state; relative humidity of a membrane manufacturing room is controlled in 45%-50%, and the temperature of the membrane manufacturing room is controlled in 25 DEG C-30 DEG C. The membranes manufactured by the preparation method of the ultrafiltration membrane with hydrophilism and antibacterial property has the advantages of being strong in antibacterial ability and anti-protein pollution, high in separation efficiency, large in water flux, and capable of being used in protein concentration or wastewater treatment in industry.

Description

technical field [0001] The invention relates to an ultrafiltration membrane and a preparation method thereof, in particular to a hydrophilic and antibacterial ultrafiltration membrane and a preparation method thereof. Background technique [0002] Compared with traditional separation methods, membrane separation has the advantages of high separation efficiency, low energy consumption and simple operation, and is one of the most promising high-tech technologies in the 21st century. Ultrafiltration has been widely used in food, medicine, biology, environmental protection, chemical industry, metallurgy, energy and other fields, and has achieved remarkable social, economic and environmental benefits, becoming the most widely used membrane separation technology. However, due to the limitation of membrane materials, membrane fouling is still a bottleneck restricting the development of membrane technology. [0003] Membrane fouling includes reversible fouling and irreversible foul...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D71/68B01D71/34B01D71/30B01D71/42B01D67/00A01N59/16A01P1/00
Inventor 黄健
Owner LISHUI UNIV
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