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Method for preparing antibacterial and antifouling ultrafiltration membrane by using silver-loaded nanocomposite material

A nanocomposite material and nanomaterial technology are applied in the field of preparing antibacterial and antifouling ultrafiltration membranes, which can solve the problems of loss of antibacterial and antifouling properties of modified ultrafiltration membranes, lack of long-term stability of silver nanoparticles, secondary pollution of material and liquid, etc. , to achieve long-term stable antibacterial and anti-pollution ability, excellent anti-pollution performance, and easy operation.

Active Publication Date: 2017-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, silver nanoparticles directly deposited on the surface of the membrane or blended inside the membrane lack long-term stability, and will be lost into the feed solution with the use of the membrane, which not only loses the antibacterial and antifouling properties of the modified ultrafiltration membrane, but also affects the Secondary pollution caused by feed liquid

Method used

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  • Method for preparing antibacterial and antifouling ultrafiltration membrane by using silver-loaded nanocomposite material
  • Method for preparing antibacterial and antifouling ultrafiltration membrane by using silver-loaded nanocomposite material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Prepare 50 mL of an aqueous dispersion containing 0.1 g of polyaniline nanofibers, add 0.09 g of tris and 0.1 g of dopamine hydrochloride, stir and react for 8 hours, centrifuge, wash and then dry to obtain polydopamine-modified nanomaterials. Then, 50 mL of aqueous dispersion containing 0.1 g of polydopamine-modified nanomaterials was prepared, 0.25 g of silver nitrate and 0.25 g of polyvinylpyrrolidone were added, stirred for 2 hours, washed by centrifugation and dried to obtain silver-loaded nanocomposites.

[0025] (2) Take 0.1g of silver-loaded nanocomposite and disperse it in 16.9g of dimethylacetamide, then add 3.0g of polysulfone, stir until it is completely dissolved, then let it stand to obtain a casting solution, and use a scraper to remove the casting solution Coating a film on a glass plate, immersing in water after pre-evaporating, and obtaining an ultrafiltration membrane containing silver-loaded nanocomposite material. The transmission electron micro...

Embodiment 2

[0028] (1) Prepare 50 mL of an aqueous dispersion containing 0.025 g of graphene nanosheets, add 0.09 g of tris and 0.05 g of dopamine hydrochloride, stir and react for 12 hours, and dry after centrifugal washing to obtain polydopamine-modified nanomaterials. Then, 50 mL of an aqueous dispersion containing 0.025 g of polydopamine-modified nanomaterials was prepared, 0.025 g of silver nitrate and 0.1 g of polyether were added, stirred for 12 hours, washed by centrifugation and then dried to obtain silver-loaded nanocomposites.

[0029] (2) Take 0.02g of silver-loaded nanocomposite and disperse it in 15.98g of dimethylacetamide, then add 4.0g of polyethersulfone, stir until it is completely dissolved, then let it stand to obtain the casting solution, and use a scraper to remove the casting solution The machine coats the film on the glass plate, immerses in water after pre-evaporation, and obtains the ultrafiltration membrane containing the silver-loaded nanocomposite material.

...

Embodiment 3

[0032] (1) Prepare 50 mL of an aqueous dispersion containing 0.25 g of carbon nanotubes, add 0.09 g of tris and 0.1 g of dopamine hydrochloride, stir and react for 5 hours, centrifuge, wash and dry to obtain polydopamine-modified nanomaterials. Then, 50 mL of an aqueous dispersion containing 0.25 g of polydopamine-modified nanomaterials was prepared, 0.1 g of silver nitrate and 0.025 g of polyethylene glycol were added, stirred for 12 hours, centrifuged, washed, and then dried to obtain silver-loaded nanocomposites.

[0033] (2) Take 0.2g of silver-loaded nanocomposite and disperse it in 8.0g of dimethylformamide, then add 1.8g of polysulfone, stir until it is completely dissolved, then let it stand to obtain a casting solution, and use a scraper to remove the casting solution Coating a film on a glass plate, immersing in a 10:1 mixture of water and dimethylformamide after pre-evaporation, to obtain an ultrafiltration membrane containing a silver-loaded nanocomposite material. ...

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Abstract

The invention discloses a method for preparing an antibacterial and anti-pollution ultrafiltration membrane by using a silver-loaded nanocomposite material. Prepare a nanomaterial aqueous dispersion, add trishydroxymethylaminomethane and dopamine hydrochloride, stir and react for 2 to 12 hours, centrifuge and wash and then dry to obtain polydopamine-modified nanomaterials; prepare polydopamine-modified nanomaterials and silver ammonia solution , a mixed solution of a stabilizer and water, stirred for 2 to 12 hours, centrifuged and washed, then dried to obtain a silver-loaded nanocomposite material. Disperse the silver-loaded nano-composite material in an organic solvent, add the membrane material, stir until it is completely dissolved, and let it stand to obtain a casting solution; scrape the casting solution into a flat film with a flat-plate scraping machine, and immerse it in a coagulation bath for phase transformation to obtain an antibacterial Anti-fouling ultrafiltration membrane. The ultrafiltration membrane of the present invention has good hydrophilicity, long-lasting antibacterial performance and excellent anti-pollution performance, has antibacterial and bactericidal effects on Escherichia coli, Bacillus subtilis, etc., and silver nanoparticles are stable in the antibacterial and anti-pollution ultrafiltration membrane exist.

Description

technical field [0001] The invention relates to a method for preparing an antibacterial and anti-pollution ultrafiltration membrane by using a silver-loaded nanocomposite material, and belongs to the technical field of membrane separation. Background technique [0002] Ultrafiltration membrane technology has been widely used in separation, concentration and purification processes, and has engineering applications in the fields of biological products, pharmaceutical products, food products and wastewater recovery. However, for a long time, the fouling of ultrafiltration membrane has seriously affected the further application of ultrafiltration technology. Membrane fouling leads to frequent cleaning of the ultrafiltration system during operation, which can easily reduce the service life of the membrane elements of the ultrafiltration system and increase the operating cost of the system. [0003] The pollution of ultrafiltration membrane is mainly organic matter (humic acid, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D67/00B01D71/60B01D71/68A01N59/16A01P1/00
Inventor 赵颂王志黄丽川王纪孝
Owner TIANJIN UNIV
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