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Pollen silicon loading nanosilver modified separation membrane and preparation method thereof

A separation membrane and nano-silver technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problem that the separation membrane cannot maintain high antibacterial efficiency for a long time, the release rate of silver ions is difficult to control, and the loading capacity of nano-silver is limited. and other problems, to achieve the effect of improving anti-pollution ability, easy industrial implementation, and high-efficiency and long-lasting antibacterial performance

Inactive Publication Date: 2019-03-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of silver improves the antibacterial and antifouling capabilities of the separation membrane, the loading of nano-silver on the surface of the separation membrane prepared by the blending method is limited, the antibacterial efficiency is not high, and the nano-silver is easy to agglomerate in the membrane, which affects Antibacterial efficiency, in addition, the release rate of silver ions in the water environment is difficult to control, the silver ions will be released soon, the separation membrane cannot maintain high antibacterial efficiency for a long time, and the service life is short

Method used

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  • Pollen silicon loading nanosilver modified separation membrane and preparation method thereof
  • Pollen silicon loading nanosilver modified separation membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] Preparation of pollen silicon-supported silver-modified polyvinylidene fluoride membrane:

[0037] (1) Dissolve 0.2wt.% resorcinol and 0.25wt.% formaldehyde in ethanol aqueous solution, stir under the catalysis of ammonia water for 6h to form spherical phenolic resin, wherein the mass fraction of ammonia water is 28% , the amount of ammonia water is 2wt.% of the ethanol aqueous solution; 0.8wt.% ethyl orthosilicate in the ethanol aqueous solution is added to the phenolic resin, and 0.5wt.% resorcinol and 0.62wt.% of the ethanol aqueous solution are added after 8 minutes. % formaldehyde, reacted for 2 hours, centrifuged, washed and dried, and burned at 550°C for 5 hours in the air atmosphere to obtain pollen silicon;

[0038] (2) dissolving pollen silicon in water (mass ratio of pollen silicon to water is 1:66) solution, under the catalysis of ammonia water, react with 0.75wt.% silver nitrate to pollen silicon aqueous solution for 24h, and the product is centrifuged, washe...

Embodiment 2

[0043] Preparation of pollen silicon-supported silver-modified polysulfone membrane:

[0044] (1) Dissolve 0.2wt.% resorcinol and 0.25wt.% formaldehyde in ethanol aqueous solution, stir under the catalysis of ammonia water for 6h to form spherical phenolic resin, wherein the mass fraction of ammonia water is 28% , the amount of ammonia water is 1wt.% of ethanol aqueous solution; 0.5wt.% methyl orthosilicate in ethanol aqueous solution is added to the phenolic resin, and 0.3wt.% resorcinol and 0.75wt.% ethanol aqueous solution are added again after 15min. % formaldehyde, reacted for 3 hours, centrifuged, washed and dried, and burned at 550°C for 5 hours in the air atmosphere to obtain pollen silicon;

[0045] (2) Dissolve pollen silicon in water (the mass ratio of pollen silicon to water is 1:55), react with 0.85wt.% silver nitrate to pollen silicon aqueous solution under the catalysis of ammonia water for 30h, and the product is centrifuged, washed and dried After drying, a s...

Embodiment 3

[0050] Preparation of pollen silicon-supported silver-modified polyvinylidene fluoride-polysulfone membrane:

[0051] (1) Dissolve 0.2wt.% resorcinol and 0.2wt.% formaldehyde in ethanol aqueous solution, stir under the catalysis of ammonia water for 6h to form spherical phenolic resin, wherein the mass fraction of ammonia water is 28% , the amount of ammonia water is 3wt.% of the ethanol aqueous solution; 0.5wt.% ethyl orthosilicate in the ethanol aqueous solution is added to the phenolic resin, and 0.7wt.% resorcinol and 0.55wt.% of the ethanol aqueous solution are added after 8 minutes. % formaldehyde, reacted for 2 hours, centrifuged, washed and dried, and burned at 550°C for 5 hours in the air atmosphere to obtain pollen silicon;

[0052] (2) Dissolve pollen silicon in water (the mass ratio of pollen silicon to water is 1:70), react with 0.68wt.% silver nitrate of pollen silicon aqueous solution under the catalysis of ammonia water for 18 hours, and the product is centrifu...

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Abstract

The invention discloses a pollen silicon loading nanosilver modified separation membrane and a preparation method thereof, and belongs to the technical field of preparation of polymer separation membranes. Silicon dioxide, pollen silicon, with special morphology is synthesized firstly, the surface of pollen silicon is loaded with nanosilver particles through bonding of silicon-oxygen-silver on thesurface, and finally the pollen silicon loading nanosilver modified separation membrane is prepared through compounding of pollen silicon and a polymer membrane material by adopting an immersion-precipitation phase transformation method. The preparation method is simple, the amount of silver ions loaded on the surface of the prepared pollen silicon loading nanosilver modified separation membraneis greatly increased, the antibiotic capability is improved, and the antibiotic property is long-lasting.

Description

technical field [0001] The invention relates to a separation membrane and a preparation method thereof, in particular to a pollen silicon-loaded nano-silver modified separation membrane and a preparation method thereof, belonging to the technical field of polymer separation membrane preparation. Background technique [0002] Membrane separation technology, as an efficient and environmentally friendly separation technology, has been widely used in the field of water and sewage treatment. In view of the problem of membrane material pollution in membrane separation technology, a single membrane material can no longer meet the requirements of practical applications. It is urgent to develop efficient and stable Membrane materials with antibacterial and antifouling properties. Among them, improving the antibacterial and antifouling properties of polymer separation membranes by modifying existing membrane materials has become a hot spot in the field of membrane preparation. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00C02F1/44
CPCB01D67/0079B01D71/34B01D2325/48C02F1/44
Inventor 王志伟张星冉平梦王天霖吴志超
Owner TONGJI UNIV
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