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Composite separation membrane as well as preparation method and application thereof

A separation membrane and polymer technology, applied in the field of preparation of polymer separation membranes, can solve the problems of weak hydrophilicity and achieve the effects of strong hydrophilicity, high utilization rate of raw materials, and short time-consuming

Active Publication Date: 2022-06-28
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing organic polymer membranes loaded with hydrophilic modified materials still have the disadvantage of weak hydrophilicity.

Method used

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  • Composite separation membrane as well as preparation method and application thereof
  • Composite separation membrane as well as preparation method and application thereof
  • Composite separation membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of hydrophilic Fe-TA-SP composite separation membrane

[0038] (1) Treatment of blank film: first soak the polyvinylidene fluoride film with ethanol for 30 minutes to remove the stains on the surface of the film, then ultrasonically clean the film with pure water for 2-3 times, and finally, dry at 60 °C to obtain a blank film ;

[0039] (2) Ink preparation: prepare a 17% n-propanol solution with distilled water cooled after boiling, add a certain amount of tannic acid to form a 23.5mM tannic acid solution to obtain TA ink; prepare a 17% n-propanol solution with distilled water, use The above solutions were prepared with 11.75mM Fe 2 (SO 4 )3 solution and 47mM NaIO 4 solution to obtain Fe ink and SP ink;

[0040] (3) Equipping ink cartridges: inject the three inks prepared in (2) into three commercial HP ink cartridges with syringes, and equip them for testing on an HP desktop 1112 printer;

[0041] (4) Inkjet printing: paste the blank film tr...

Embodiment 2

[0043] Example 2: Preparation of hydrophilic Fe-TA-SP composite separation membrane

[0044] (1) Treatment of blank film: first soak the polyvinylidene fluoride film in ethanol for 30 minutes to remove the stains on the surface of the film, then ultrasonically clean the film with pure water for 2-3 times, and finally, dry at 60 °C to obtain a blank film ;

[0045] (2) Ink preparation: prepare a 17% n-propanol solution with distilled water cooled after boiling, add a certain amount of tannic acid to form a 23.5mM tannic acid solution to obtain TA ink; prepare a 17% n-propanol solution with distilled water, use The above solutions were prepared with 11.75mM Fe 2 (SO 4 ) 3 solution and 47mM NaIO 4 solution to obtain Fe ink and SP ink;

[0046] (3) Equipping ink cartridges: inject the three inks prepared in (2) into three commercial HP ink cartridges with syringes, and equip them for testing on an HP desktop 1112 printer;

[0047] (4) Inkjet printing: paste the blank film tr...

Embodiment 3

[0049] Example 3: Preparation of hydrophilic Fe-TA-SP composite separation membrane

[0050] (1) Treatment of blank film: first soak the polyvinylidene fluoride film in ethanol for 30 minutes to remove the stains on the surface of the film, then ultrasonically clean the film with pure water for 2-3 times, and finally, dry at 60 °C to obtain a blank film ;

[0051] (2) Ink preparation: prepare a 17% n-propanol solution with distilled water cooled after boiling, add a certain amount of tannic acid to form a 23.5mM tannic acid solution to obtain TA ink; prepare a 17% n-propanol solution with distilled water, use The above solutions were prepared with 11.75mM Fe 2 (SO 4 ) 3 solution and 47mM NaIO 4 solution to obtain Fe ink and SP ink;

[0052] (3) Equipping ink cartridges: inject the three inks prepared in (2) into three commercial HP ink cartridges with syringes, and equip them for testing on an HP desktop 1112 printer;

[0053] (4) Inkjet printing: paste the blank film tr...

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Abstract

The invention relates to a preparation method of a composite separation membrane, which is characterized in that a metal salt solution, a polyphenol solution and an oxidant solution are matched for use, and are subjected to complex reaction and oxidative polymerization reaction on a polymer substrate, so that a modified layer with relatively strong hydrophilicity is formed, and the flux, the rejection rate and the anti-pollution performance of the separation membrane are improved. The preparation method is short in time consumption, simple to operate, mild in reaction condition and easy to realize large-scale industrial application, and has obvious popularization advantages. The preparation method disclosed by the invention can be carried out through ink-jet printing, and is high in raw material utilization rate, free of resource waste and environment-friendly. The invention also relates to the composite separation membrane obtained by the preparation method, and the composite separation membrane has the advantages of strong hydrophilicity, high flux, high rejection rate, high pollution resistance and good separation effect, and has important significance in the separation of oil-water emulsions.

Description

technical field [0001] The invention relates to the field of preparation of polymer separation membranes, in particular to a composite separation membrane and a preparation method and application thereof. Background technique [0002] Membrane separation technology is to use the selective permeability of membrane to separate different components from mixture under the action of external force, so as to achieve the purpose of separation, purification, concentration and classification. Membrane separation technology has the advantages of high efficiency, low cost, small secondary pollution, simple operation, energy saving, etc., and plays an increasingly important role in water and wastewater treatment. [0003] However, the commonly used organic polymer membranes are easily contaminated by oil droplets due to their low surface energy and strong hydrophobicity, resulting in a severe reduction in flux and rejection, and shortened membrane life. If the membrane surface is hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D69/12B01D67/00C02F1/44C02F1/40
CPCB01D71/34B01D69/02B01D69/12B01D67/0002B01D67/0006C02F1/44C02F1/40B01D2323/02B01D2323/26
Inventor 李仁杰谢红丽林红军钟一可
Owner ZHEJIANG NORMAL UNIVERSITY
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