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Preparation method of polyvinylidene fluoride modified membrane, and polyvinylidene fluoride modified membrane and application thereof

A technology of polyvinylidene fluoride and polyethyleneimine, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of expensive reaction equipment, harsh film-forming conditions, and many types of reagents, and achieve hydrophilic modification The effect is obvious and the preparation process is simple

Active Publication Date: 2021-03-26
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film-forming conditions of this invention are harsh, and there are many kinds of reagents required for film-forming, and the reaction equipment is expensive.

Method used

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  • Preparation method of polyvinylidene fluoride modified membrane, and polyvinylidene fluoride modified membrane and application thereof
  • Preparation method of polyvinylidene fluoride modified membrane, and polyvinylidene fluoride modified membrane and application thereof
  • Preparation method of polyvinylidene fluoride modified membrane, and polyvinylidene fluoride modified membrane and application thereof

Examples

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Effect test

Embodiment 1

[0048] A method for preparing a hydrophilic polyvinylidene fluoride modified membrane for oil-water emulsion separation, comprising the following steps:

[0049] 1) Put a commercial polyvinylidene fluoride microfiltration membrane (hereinafter referred to as the original PVDF membrane) (average pore size is 0.22 μm) into a beaker, add absolute ethanol, infiltrate at room temperature for 2 hours to activate the pores, take out the membrane before use Wash with ultrapure water three times;

[0050] 2) Immerse the pretreated polyvinylidene fluoride membrane in step 1) into a ferric ion solution (concentration: 1 mg / mL) for a rapid stirring reaction for 5 minutes, and wash off the unstable ferric ions on the membrane surface with ultrapure water;

[0051] 3) The film obtained in step 2) is immersed in a tannic acid solution, and polyethyleneimine is added dropwise to the tannic acid solution until the pH of the solution=7.8, and the concentrations of the tannic acid and polyethyle...

Embodiment 2

[0074] A method for preparing a hydrophilic polyvinylidene fluoride modified membrane for oil-water emulsion separation, comprising the following steps:

[0075] 1) Put the original PVDF membrane into a beaker, add absolute ethanol, infiltrate at room temperature for 1 hour to activate the pores, take out the membrane and wash it with ultrapure water three times before use;

[0076] 2) Immerse the pretreated polyvinylidene fluoride membrane in step 1) into a ferric ion solution (concentration: 1 mg / mL) for rapid stirring reaction for 10 minutes, and wash off the unstable ferric ions on the membrane surface with ultrapure water;

[0077] 3) Immerse the film obtained in step 2) into a tannic acid solution, and add polyethyleneimine dropwise to the tannic acid solution until the pH of the solution=7.8, and the concentrations of tannic acid and polyethyleneimine are respectively 1 mg / mL, 2mg / mL, open the reaction at room temperature for 6 hours, take out the membrane, wash it wit...

Embodiment 3

[0090] A method for preparing a hydrophilic polyvinylidene fluoride modified membrane for oil-water emulsion separation, comprising the following steps:

[0091] 1) Put the original PVDF membrane into a beaker, add absolute ethanol, infiltrate at room temperature for 2 hours to activate the pores, take out the membrane and wash it with ultrapure water three times before use;

[0092] 2) Immerse the pretreated polyvinylidene fluoride membrane in step 1) into a ferric ion solution (concentration: 1 mg / mL) and react with rapid stirring for 15 minutes, and wash off the unstable ferric ions on the surface of the membrane with ultrapure water;

[0093] 3) The film obtained in step 2) is immersed in a tannic acid solution, and polyethyleneimine is added dropwise to the tannic acid solution until the pH of the solution=7.8, and the concentrations of the tannic acid and polyethyleneimine are respectively 4mg / mL, 0.5mg / mL, open the reaction at room temperature for 4 hours, take out the ...

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Abstract

The invention belongs to the technical fields of oil-water emulsion separation and heavy metal ion adsorption, belonging to a preparation method of a polyvinylidene fluoride modified membrane, and thepolyvinylidene fluoride modified membrane and application thereof. The method comprises the following specific steps: 1) immersing a polyvinylidene fluoride micro-filtration membrane into an aqueousferric ion solution, then taking out the membrane and cleaning the membrane; 2) immersing the obtained polyvinylidene fluoride micro-filtration membrane into an aqueous tannic acid solution, then adding polyethyleneimine into the aqueous tannic acid solution, taking out the polyvinylidene fluoride micro-filtration membrane after an open reaction, and conducting cleaning to obtain a PVDF membrane modified by tannic acid and polyethyleneimine; 3) immersing the obtained PVDF membrane modified by tannic acid and polyethyleneimine into an aqueous glutaraldehyde solution for a reaction to obtain a glutaraldehyde crosslinked PVDF membrane; and 4) immersing the glutaraldehyde crosslinked PVDF membrane into an aqueous cysteine solution, and then taking out the immersed membrane to obtain the polyvinylidene fluoride modified membrane. According to the invention, hydrophilicity is improved, protein pollution resistance is improved, an emulsion retention rate is high, and heavy metal adsorption effect is good.

Description

technical field [0001] The invention belongs to the technical field of oil-water emulsion separation and heavy metal ion adsorption, and specifically relates to a preparation method of a polyvinylidene fluoride modified membrane, a polyvinylidene fluoride modified membrane and an application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Oily industrial production, frequent marine oil spill accidents and daily water use will produce a large amount of oily sewage every year. The direct discharge of these oily sewage poses a huge threat to the ecological environment and human health. How to effectively treat these oily sewage becomes Particularly important. Due to the ad...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/78B01D69/12C02F1/40C02F1/44C02F101/20C02F101/22
CPCB01D71/78B01D71/82C02F1/40C02F1/44B01D69/125B01D2325/36C02F2101/20C02F2101/22Y02A20/131
Inventor 吴中杰黄仁亮刘则艳侯亚琴谢连科张永
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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