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Method for preparing biological-pollution-resisting super-hydrophilic microfiltration membrane

An anti-biological fouling and microfiltration membrane technology, which is applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of restricting the popularization and application of modification methods, poor hydrophilicity and anti-pollution ability, and difficulty in forming micro-nano structures, etc. problems, to achieve good anti-biological pollution performance, hydrophilic and anti-pollution ability, large surface roughness

Active Publication Date: 2018-09-28
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrophilic modification of microfiltration membranes usually requires the introduction of hydrophilic substances to the surface of the substrate, and the immobilization of hydrophilic substances to the surface of the substrate requires some introduction into the structure of the substance and / or the surface of the substrate Specific interaction groups, which limit the types of modifiable materials to only a few types, and also limit the popularization and application of modification methods
According to mussel-like universal adhesion, universal hydrophilic modification can be performed on the surface of stainless steel filter, organic membrane and inorganic membrane, while in the current modification process, dopamine hydrochloride adheres to the surface of these substrates , it is not easy to form micro-nano structures or less micro-nano structures are formed, so its hydrophilicity and anti-pollution ability are poor

Method used

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  • Method for preparing biological-pollution-resisting super-hydrophilic microfiltration membrane
  • Method for preparing biological-pollution-resisting super-hydrophilic microfiltration membrane
  • Method for preparing biological-pollution-resisting super-hydrophilic microfiltration membrane

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Construction of polydopamine mediation layer with micro-nano structure:

[0035]Prepare 2 mg / mL polydopamine nanoparticle solution and 1 mg / mL dopamine hydrochloride solution respectively; immerse the microfiltration membrane in the dopamine hydrochloride solution for 60 minutes and then immerse in the polydopamine nanoparticle solution for 60 minutes. Repeat the above process 3 times. A mediation layer containing polydopamine nanoparticles is constructed on the surface of the microfiltration membrane.

[0036] (2) Construction of zwitterionic polymer coating:

[0037] Dissolve the zwitterionic polymer in the ethanol solution, the concentration of the zwitterionic polymer is 2 mg / mL, adjust the pH of the solution to 6.5-7.5 with triethylamine, and spray the above solution evenly on the surface containing polydopamine with a spray gun. The surface of the nylon microfiltration membrane of the mediation layer is treated by heating at 40-70°C in a methanol atmosphere; ...

Embodiment 2

[0040] (1) Construction of polydopamine mediation layer with micro-nano structure:

[0041] Prepare 5mg / mL polydopamine nanoparticle solution and 5mg / mL dopamine hydrochloride solution respectively; immerse the microfiltration membrane in dopamine hydrochloride solution for 30min and then immerse in polydopamine nanoparticle solution for 30min, repeat the above process twice, A mediation layer containing polydopamine nanoparticles is constructed on the surface of the microfiltration membrane.

[0042] (2) Construction of zwitterionic polymer coating:

[0043] Dissolve the zwitterionic polymer in the ethanol solution, the concentration of the zwitterionic polymer is 5 mg / mL, adjust the pH of the solution to 6.5-7.5 with triethylamine, and spray the above solution evenly on the surface containing polydopamine with a spray gun. The surface of the nylon microfiltration membrane of the mediation layer is treated by heating at 40-70°C in an organic solvent atmosphere;

[0044] The...

Embodiment 3

[0046] (1) Construction of polydopamine mediation layer with micro-nano structure:

[0047] Prepare 1 mg / mL polydopamine nanoparticle solution and 2 mg / mL dopamine hydrochloride solution respectively; immerse the microfiltration membrane in the dopamine hydrochloride solution for 60 minutes and then immerse in the polydopamine nanoparticle solution for 60 minutes. Repeat the above process 5 times. A mediation layer containing polydopamine nanoparticles is constructed on the surface of the microfiltration membrane.

[0048] (2) Construction of zwitterionic polymer coating:

[0049] Dissolve the zwitterionic polymer in the PBS solution of pH 7.4, the concentration of the zwitterionic polymer is 1.5mg / mL, adjust the pH of the solution to 6.5-7.5 with NaOH and HCl, and prepare the The nylon microfiltration membrane containing the polydopamine mediation layer was immersed in the above zwitterionic polymer solution, the reaction temperature was 60° C., the reaction time was 8 hours...

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Abstract

The invention provides a method for preparing a biological-pollution-resisting super-hydrophilic microfiltration membrane. The method comprises the following steps: separately preparing a polydopaminenanoparticle solution and a dopamine hydrochloride solution; sequentially submerging a microfiltration membrane into the dopamine hydrochloride solution and the polydopamine nanoparticle solution, and repeating the above-mentioned process for at least once so as to construct a polydopamine nanoparticle containing mediating layer on the surface of the microfiltration membrane; and preparing an amphoteric ion polymer solution, and constructing an amphoteric ion polymer coating on the surface of the microfiltration membrane containing the polydopamine mediating layer by a spray-coating or dip-coating method. The super-hydrophilic microfiltration membrane prepared by the method provided by the invention is high in surface roughness, has the advantages of good stability, high hydrophilicity, high pollution resistance and long service life, can be used for efficiently separating a stable oil-water emulsion, a high-viscosity oil-water mixture and a protein solution, and meanwhile, has good biological-pollution-resisting performance on biological pollution of bacteria, proteins and the like.

Description

technical field [0001] The invention relates to a preparation method of a microfiltration membrane, in particular to a preparation method of an anti-biological pollution ultra-hydrophilic microfiltration membrane. Background technique [0002] With the development of the economy, human beings' demand for energy is also increasing. Usually, the oil-water mixture is relatively simple to handle, and can be separated by traditional gravity separation, heating demulsifier and electric dehydration. However, due to the small particle size (less than 10 μm), the oil-containing emulsion is difficult to handle, especially the stable emulsion system. For the emulsion system, chemical demulsification separation, air flotation method and membrane separation method can be used for treatment. The chemical demulsification method is to add a demulsifier to the oil-water emulsion to promote the phase separation of oil and water, but the amount of demulsifier High, poor universality and other...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D69/02B01D67/00B01D61/14B01D61/40
CPCB01D61/147B01D61/40B01D67/0006B01D69/02B01D71/82B01D2325/28B01D2325/36B01D2325/48
Inventor 宮永宽孟凡宁
Owner NORTHWEST UNIV