Nano-silver antibacterial ultrafiltration membrane and preparation method thereof

A nano-silver antibacterial and ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of difficult automation, microbial contamination, fouling and blocking membrane performance, etc., and achieve the improvement of surface hydrophilicity, Good anti-pollution performance and long-term antibacterial effect

Inactive Publication Date: 2021-11-26
苏州普希环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the polyamide membrane is made of organic polymer materials, a large number of microorganisms are easy to adsorb, grow, and reproduce on the surface of the membrane, causing bacterial pollution, causing membrane fouling and degrading membrane performance
[0003] The use of membrane separation technology only provides the necessary operating pressure for the supply of raw water, and it only needs to run for a long time before flushing the filter membrane, and there are no other processes. In this case, it is easy to automate the operation of the membrane device and achieve unmanned management. , while routine processing is not easy to automate
Easy to produce drug resistance, easy to cause secondary pollution and easy to decompose into small molecules with toxic side effects, poor heat resistance
Therefore, the present invention provides a nano-silver antibacterial ultrafiltration membrane and a preparation method thereof, to solve the problem of poor antibacterial effect of the ultrafiltration membrane, easy fouling and low water production flux, improve the antibacterial effect on the ultrafiltration membrane, and enhance ultrafiltration. Membrane service life

Method used

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  • Nano-silver antibacterial ultrafiltration membrane and preparation method thereof
  • Nano-silver antibacterial ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 (sample 1 comparative example):

[0028] Mix PEG20000 containing 16wt% polysulfone membrane material with a mass concentration of 2.0wt% and organic solvent N,N-dimethylacetamide (DMAc), heat to 80°C and stir for 24 hours, cool to 25°C and let stand Degassing for 8 hours to obtain casting solution A; scrape coating casting solution A on a polyester non-woven mechanical support, and use 35°C pure water as a coagulation bath to prepare a flat ultrafiltration membrane separation by phase inversion method functional layer.

Embodiment 2

[0029] Embodiment 2 (sample 2):

[0030] Sample 1 was placed in 0.5 wt% polyethyleneimine aqueous solution with a weight average molecular weight of 70000Da for 30 seconds, after scraping off excess aqueous solution, washed with pure water for 3 minutes and then immersed in 25°C antibacterial treatment agent for 1 minute; The antibacterial treatment agent is prepared by stirring and mixing 1% of silver nitrate nano-silver ions with a size of 10 to 40nm, 0.5% of sodium hydroxide and 98.5% of water for 24 hours under the assistance of ultrasonic waves. Then, heat and dry after removing excess antibacterial treatment agent, the heating temperature is 50 degrees, and the drying time is 5 minutes.

[0031] Antibacterial performance evaluation: The antibacterial performance evaluation refers to the test method 100-2004 of the American Association of Textile Chemical Colorists (AATCC). In this paper, Escherichia coli (E.coli) was selected as the representative bacteria to evaluate the...

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Abstract

The invention provides a nano-silver antibacterial ultrafiltration membrane. The ultrafiltration membrane is sequentially provided with a porous supporting membrane, a separation function layer and an antibacterial coating from bottom to top, the antibacterial coating comprises a bonding coating and an inorganic nano coating; the invention further provides a preparation method of the ultrafiltration membrane, the preparation method comprises the steps that S1, the porous supporting membrane is formed; S2, the polymer layer is prepared; and S3, the antibacterial coating is formed. According to the ultrafiltration membrane prepared through the method, nano-silver belongs to an inorganic antibacterial agent, and the ultrafiltration membrane has the advantages that drug resistance is not prone to being generated, heat resistance is high, and the long-acting broad-spectrum antibacterial effect is achieved; according to the present invention, the high density cations of the polyethyleneimine coating can endow the ultrafiltration membrane with the ion retention property, the strong chelation effect exists between the polyethyleneimine and the silver ions so as not to easily fall off due to repeated cleaning and long-time friction, such that the pollution caused by the falling of the silver ions is avoided, and the water treatment membrane has the long-term antibacterial property.

Description

technical field [0001] The invention relates to the technical field of filter membranes for sewage treatment, in particular to a nano-silver antibacterial ultrafiltration membrane and a preparation method thereof. Background technique [0002] In the field of filter membrane technology for sewage treatment, membrane water treatment is a solid-liquid separation technology. It uses membrane pores to filter water and retain impurities in water. Using such a membrane can mainly remove colloids and plankton, etc. Insoluble iron and manganese are removed, and fungi can be removed. However, in order to prevent bacteria from being regenerated in the clear water pool, the sterilization process cannot be omitted. The raw water directly connected to the plate-frame and spiral membranes should remove the floating substances in the raw water before flowing into the membrane in order to prevent the membrane pores from being blocked. Because the polyamide membrane is made of organic poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D61/14B01D67/00
CPCB01D69/10B01D61/145B01D67/0088B01D2325/48B01D2325/38B01D2325/24
Inventor 林小锋
Owner 苏州普希环保科技有限公司
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