Preparation method of antibacterial and pollution-resistant renewable ultra-filtration membrane

An ultrafiltration membrane and anti-pollution technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low water flux of polysulfone ultrafiltration membranes, reduced membrane surface adsorption capacity, microbial contamination, etc., to achieve increased The hydrophilicity of the membrane, the improvement of antibacterial and anti-pollution ability, and the effect of reducing adsorption

Active Publication Date: 2017-02-22
BOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophobicity of polysulfone itself, the water flux of pure polysulfone ultrafiltration membranes is generally relatively low, and it is prone to microbial contamination
[0004] At present, anti-fouling membranes are generally achieved by adding antibacterial agents. Although the membranes containing only antibacterial agents can effectively kill microorganisms, they do not have the ability to reduce the adsorption capacity of the membrane surface, resulting in the adsorption of dead microorganisms on the membrane surface, which is more conducive to microbial adsorption. greater pollution

Method used

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  • Preparation method of antibacterial and pollution-resistant renewable ultra-filtration membrane
  • Preparation method of antibacterial and pollution-resistant renewable ultra-filtration membrane
  • Preparation method of antibacterial and pollution-resistant renewable ultra-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Dissolve 9.5g of polysulfone and 0.5g of amphiphilic polymer A in N-methylpyrrolidone, stir fully at 60°C until completely dissolved, and prepare a solution with a mass fraction of 18%, and obtain a uniform solution after degassing at room temperature. A stable casting solution; the amphiphilic polymer A is polyethylene glycol-modified phenolphthalein polyethersulfone, and the specific structure is as follows,

[0038] Wherein, m / (m+n)=20%, molecular weight is 160000;

[0039] (2) Pour the casting solution on a glass plate, and use a spatula to uniformly form a flat film with a blade gap of 150 mm, quickly put it into deionized water, and soak in deionized water for 24 hours to remove residual solvent. Take out the ultrafiltration membrane and soak it in 1% sodium hypochlorite solution at 20°C for 1 hour, wash away the residual sodium hypochlorite with deionized water until the starch / potassium iodide solution does not turn blue, and obtain a renewable ultrafiltra...

Embodiment 2

[0047](1) Dissolve 9.0g of polysulfone and 1.0g of amphiphilic polymer A in N-methylpyrrolidone, stir well at 60°C until completely dissolved, and prepare a solution with a mass fraction of 18%, and obtain a uniform solution after degassing at room temperature. A stable casting solution; the amphiphilic polymer A is polyethylene glycol-modified phenolphthalein polyethersulfone, and the specific structure is as follows,

[0048] Wherein, m / (m+n)=80%, molecular weight is 80000;

[0049] (2) Pour the casting solution on a glass plate, and use a spatula to uniformly form a flat film with a blade gap of 150 mm, quickly put it into deionized water, and soak in deionized water for 24 hours to remove residual solvent. Take out the ultrafiltration membrane and soak it in 2% sodium hypochlorite solution at a temperature of 35°C for 2 hours, wash away the residual sodium hypochlorite with deionized water until the starch / potassium iodide solution does not turn blue, and obtain a renewa...

Embodiment 3

[0055] (1) Dissolve 8.5g of polysulfone and 1.5g of amphiphilic polymer A in N-methylpyrrolidone, stir fully at 60°C until completely dissolved, and prepare a solution with a mass fraction of 18%, and obtain a uniform solution after degassing at room temperature. A stable casting solution; the amphiphilic polymer A is polyethylene glycol-modified phenolphthalein polyethersulfone, and the specific structure is as follows,

[0056] Wherein, m / (m+n)=50%, molecular weight is 100000;

[0057] (2) Pour the casting solution on a glass plate, and use a spatula to uniformly form a flat film with a blade gap of 150 mm, quickly put it into deionized water, and soak in deionized water for 24 hours to remove residual solvent. Take out the ultrafiltration membrane and soak it in a 3% sodium hypochlorite solution at a temperature of 20°C for 1 hour, wash away the residual sodium hypochlorite with deionized water until the starch / potassium iodide solution does not turn blue, and obtain a re...

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Abstract

The invention relates to a preparation method of an antibacterial and pollution-resistant renewable ultra-filtration membrane. The antibacterial ultra-filtration membrane is prepared by blending an amphiphilic polymer A and polysulfone, wherein the amphiphilic polymer contains a hydrophilic polyethylene glycol monomethyl ether chain and an NH bond easy to react with sodium hypochlorite to generate an antibacterial group N-Cl bond; the ultra-filtration membrane has excellent bactericidal property and good and pollution resistance. The preparation method provided by the invention has the advantages that sterilizing rate of the ultra-filtration membrane for escherichia coli is more than 90 percent, and the sterilizing rate of the ultra-filtration membrane for staphylococcus aureus is more than 95 percent; in addition, the antibacterial ultra-filtration membrane is good in filtration and separation properties, recyclable and renewable, environment-friendly and free from corrosion.

Description

technical field [0001] The invention relates to the field of membrane separation material technology and environmental protection, in particular to a preparation method of an antibacterial and anti-pollution reproducible ultrafiltration membrane. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology, which has outstanding advantages such as high efficiency, convenient operation, no pollution to the environment, and low energy consumption. It has been widely used in water resources, environment and other fields. During the use of the membrane, with the extension of the use time, it is inevitable to encounter the problem of membrane fouling. Membrane fouling can be roughly divided into adsorption fouling caused by organic matter and colloids adsorbed on the membrane surface and biological fouling caused by microorganisms. Among them, biological fouling is the main factor limiting the wide application of membranes. ...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/68
CPCB01D67/0011B01D69/02B01D71/68B01D2325/36B01D2325/48
Inventor 侯淑华任冬梅刘宇辉钟克利赵岩刘玉静汤立军
Owner BOHAI UNIV
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