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Preparation method of super-hydrophilic antibacterial PVDF separation membrane

A separation membrane and super-hydrophilic technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of expensive plasma equipment and difficulty in industrial production, achieve wide application value, prolong service life, Effect of improving anti-pollution ability and antibacterial performance

Active Publication Date: 2019-12-24
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN109499393A uses plasma and acid to treat PVDF membrane and graft amination-modified nanoparticles to form a nanostructured hydrophilic layer on the surface of the membrane. Although the prepared membrane has good hydrophilicity, the plasma equipment is relatively Expensive, difficult to produce industrially
[0004] In modern technology, there are many ways to improve the hydrophilicity of PVDF membranes by grafting, but the method of improving the hydrophilicity and antibacterial properties of PVDF membranes by grafting gallic acid has not been reported so far.

Method used

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  • Preparation method of super-hydrophilic antibacterial PVDF separation membrane
  • Preparation method of super-hydrophilic antibacterial PVDF separation membrane
  • Preparation method of super-hydrophilic antibacterial PVDF separation membrane

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Experimental program
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Effect test

Embodiment 1

[0030] a) configuring pH=11 sodium hydroxide solution, adding a phase transfer catalyst;

[0031] b) Soak the PVDF membrane in the solution obtained in step a), raise the temperature to 30°C, and react for 10 hours;

[0032] c) configuring a buffer solution with pH=4.5;

[0033] d) adding gallic acid (GAL) and laccase into the buffer solution, stirring and dissolving, the concentration of gallic acid is 2g / L;

[0034] e) Soak the PVDF after alkali treatment in step b) into the solution obtained in step d), raise the temperature to 30° C., and react for 10 h;

[0035] f) Soak the polygallic acid-grafted PVDF membrane obtained in step e) in a saturated sodium bisulfite solution for 24 hours, take it out, wash it and dry it in vacuum at 40° C. to obtain the super-hydrophilic antibacterial PVDF separation membrane M1.

Embodiment 2

[0037] a) configuring pH=11 sodium hydroxide solution, adding a phase transfer catalyst;

[0038] b) Soak the PVDF membrane in the solution obtained in step a), raise the temperature to 50°C, and react for 4 hours;

[0039] c) configuring a buffer solution with pH=4.5;

[0040] d) adding gallic acid (GAL) and laccase into the buffer solution, stirring and dissolving, the concentration of gallic acid is 5g / L;

[0041] e) Soak the PVDF after alkali treatment in step b) into the solution obtained in step d), raise the temperature to 50° C., and react for 6 hours;

[0042] f) Soak the polygallic acid-grafted PVDF membrane obtained in step e) in a saturated sodium bisulfite solution for 24 hours, take it out, wash it and dry it in vacuum at 40° C. to obtain the super-hydrophilic antibacterial PVDF separation membrane M2.

Embodiment 3

[0044] a) configuring pH=11 sodium hydroxide solution, adding a phase transfer catalyst;

[0045] b) Soak the PVDF membrane in the solution obtained in step a), raise the temperature to 50°C, and react for 5 hours;

[0046] c) configuring a buffer solution with pH=4.5;

[0047] d) adding gallic acid (GAL) and laccase into the buffer solution, stirring and dissolving, the concentration of gallic acid is 5g / L;

[0048] e) Soak the PVDF after alkali treatment in step b) into the solution obtained in step d), raise the temperature to 50° C., and react for 10 h;

[0049] f) Soak the polygallic acid-grafted PVDF membrane obtained in step e) in a saturated sodium bisulfite solution for 24 hours, take it out, wash it and dry it in vacuum at 40° C. to obtain the super-hydrophilic antibacterial PVDF separation membrane M3.

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Abstract

The invention discloses a preparation method of a super-hydrophilic antibacterial PVDF separation membrane. The method includes firstly treating the surface of a PVDF membrane with an alkaline solution to generate double bonds; soaking the membrane into an acetic acid / sodium acetate buffer solution containing laccase and gallic acid, and heating and reacting for a period of time to prepare a PVDF-g-PGAL membrane; and soaking the PVDF-g-PGAL membrane in a saturated sodium hydrogen sulfite solution for 24 hours to obtain the super-hydrophilic antibacterial PVDF separation membrane. The surface of the modified membrane contains a large amount of hydroxyl, carboxyl and sulfonic acid groups, so that the hydrophilicity of the surface of the prepared membrane is greatly improved; and the polygallic acid grafted on the surface enables the membrane to have good antibacterial performance. According to the method, the problem of strong hydrophobicity of the separation membrane is solved, membranepores are prevented from being blocked due to adsorption and deposition of pollutants on the surface of the membrane and formation of bacterial colonies on the surface of the membrane in the application process, the anti-pollution capability and antibacterial property of the membrane are improved, and the service lifetime of the membrane is prolonged.

Description

technical field [0001] The invention belongs to the field of superhydrophilic antibacterial separation membranes, and in particular relates to a preparation method of superhydrophilic antibacterial PVDF separation membranes. Background technique [0002] In recent years, with the leakage of crude oil at sea and the arbitrary discharge of oily wastewater, serious marine ecological damage and huge economic losses have been caused, further aggravating environmental pollution. Currently, various oil-water separation methods have been reported, such as coagulation, physical adsorption, and gravity separation, but these methods are not suitable for separating oil-in-water emulsions with particle sizes smaller than 20 μm, and the separation of oil-water emulsions is still a great challenge. [0003] Using traditional separation methods, the membrane separation method has the advantages of high efficiency, low cost, and simple operation, and has been proven to be an effective oil-wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02C02F1/44
CPCB01D67/0079B01D69/02B01D71/34B01D2325/36B01D2325/48C02F1/44
Inventor 李成才郭玉海朱海霖王峰刘国金
Owner ZHEJIANG SCI-TECH UNIV