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Antimicrobial polysulphone flat ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and polysulfone technology, which is applied in the field of novel antibacterial polysulfone flat ultrafiltration membrane and its preparation, can solve the problems of difficult and uniform dispersion of nano-materials, and achieve the improvement of mechanical properties, water quality and mechanical properties. Effect

Inactive Publication Date: 2012-07-11
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings of existing methods that nanomaterials are difficult to disperse uniformly and that nanomaterials need to be pretreated, the present invention provides an antibacterial polysulfone flat ultrafiltration membrane and a preparation method thereof

Method used

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  • Antimicrobial polysulphone flat ultrafiltration membrane and preparation method thereof
  • Antimicrobial polysulphone flat ultrafiltration membrane and preparation method thereof
  • Antimicrobial polysulphone flat ultrafiltration membrane and preparation method thereof

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specific Embodiment approach 1

[0021] Embodiment 1: The antibacterial polysulfone flat ultrafiltration membrane of this embodiment uses polysulfone as the film-forming material, and the nano-silver particles prepared by the liquid phase reduction of silver nitrate method are used as the antibacterial additive, and are prepared by the immersion precipitation phase inversion method. The mass percentage of polysulfone in the mixture is 8% to 26%, silver nitrate accounts for 0.1% to 1% of the total mass, the reducing agent accounts for 5% to 20% of the total mass, and the porogen accounts for 3% to 10% of the total mass. %, and the rest are solvents.

[0022] The preparation method comprises the following steps:

[0023] 1. Preparation of nano silver:

[0024] Silver nitrate is reduced by a liquid phase reduction method to obtain nano-silver, wherein N, N-dimethylformamide is used as a reducing agent for silver nitrate, and the reaction equation is:

[0025]

[0026] Add N, N-dimethylformamide solution acc...

specific Embodiment approach 2

[0036] Specific embodiment two: in the there-necked flask that stirring bar, thermometer, constant pressure funnel are housed, add the N that accounts for 20% of total mass, N-dimethylformamide (analytical grade, Tianjin Kemiou Chemical Reagent Co., Ltd.) solution ,heating. Take by weighing 0.5% of the total mass of silver nitrate (analytical grade, Beijing Fine Chemicals Co., Ltd.) particles, dissolved in 1% of the total mass of water and N, N-dimethylformamide (analytical grade, Tianjin Kemiou Chemical Reagent Co., Ltd.) in the mixed solution (mixing volume ratio is 1:1), through the constant pressure dropping funnel dropwise added to the boiling N, N-dimethylformamide, about 5mins added, at 120 ℃ The reaction was stirred for 2h.

[0037]At the same time, 20% polysulfone (viscosity of 0.58, produced by Dalian Polysulfone Material Co., Ltd.) was dissolved in 53.5% N-methyl-2-pyrrolidone by mass percentage, and 5% mass percentage was added. Polyvinylpyrrolidone K10 (analytic...

specific Embodiment approach 3

[0039] Embodiment 3: The preparation of nano-silver and its proportion are the same as in Embodiment 2. Dissolve the dried polysulfone with a mass percentage of 20% in N-methyl-2-pyrrolidone with a mass percentage of 53.5%, add polyvinylpyrrolidone K30 with a mass percentage of 5%, stir in a water bath at 60°C, and wait until It is dissolved into a uniform transparent solution, and the prepared nano-silver sol is added thereto, stirred at a constant temperature for about 2 hours, left standing for defoaming, and the film is formed according to the same method as in Embodiment 2.

[0040] The average pore diameter of the composite polysulfone ultrafiltration membrane obtained in this embodiment is 30nm, the porosity is 71%, and the maximum stress is 4.04N / mm 2 , the fracture stress is 4.02N / mm 2 . The pure water flux and rejection rate of the filter membrane are 104L / m 2 • h and 94%. The antibacterial rate against Escherichia coli is 83%.

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Abstract

The invention provides an antimicrobial polysulphone flat ultrafiltration membrane, relates to an antimicrobial polysulphone flat ultrafiltration membrane and a preparation method thereof, and aims to solve the problem that in the prior art, the nanomaterial is hard to be dispersed uniformly and needs to be pretreated. The antimicrobial polysulphone flat ultrafiltration membrane is a silver nanoparticle-polysulphone composite flat ultrafiltration membrane which is prepared from polysulphone and silver nanoparticles by immersion precipitated phase conversion process, polysulphone is used as a film-forming material, and silver nanoparticles are prepared by liquid phase reduction of silver nitrate and used as an antimicrobial additive. The mass percentage of polysulphone in the mixture is 8% to 26%, silver nitrate accounts for 0.1% to 1% of the total mass, the reducing agent accounts for 5% to 20% of the total mass, the pore forming agent accounts for 3% to 10% of the total mass, and the solvents are in the balance. The ultrafiltration membrane plays a role of killing microorganisms and sterilizing in addition to filtration, the membrane surface is not contaminated, and the effluent quality is improved.

Description

technical field [0001] The present invention relates to a novel antibacterial polysulfone flat ultrafiltration membrane and its preparation process, in particular to a composite flat ultrafiltration which uses polysulfone as the film-forming material and nano-silver particles prepared by liquid-phase reduction of silver nitrate as antibacterial additives Membranes and methods for their preparation. Background technique [0002] At present, one of the bottleneck problems affecting the further application of ultrafiltration technology is membrane fouling, that is, biomacromolecules in the solution are adsorbed or deposited on the surface of the membrane, resulting in blockage of membrane pores and reduction of pore size, resulting in continuous decline in ultrafiltration performance. Phenomenon. Therefore, most of the current research hotspots at home and abroad are concentrated on the antifouling performance of the membrane. [0003] As we all know, silver has natural bacte...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/06B01D67/00
Inventor 史宝利张芯
Owner NORTHEAST FORESTRY UNIVERSITY
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