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Preparation method of polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance

A polyvinylidene fluoride and mixed matrix membrane technology, applied in the field of membrane separation, can solve problems such as insufficient anti-pollution, and achieve excellent anti-pollution, enhanced anti-pollution, and increased pure water flux

Active Publication Date: 2019-11-22
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ultrafiltration membrane prepared by this method has insufficient anti-pollution properties to the organic pollutant BSA in the L ovalbumin (OVA) salt solution.

Method used

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  • Preparation method of polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance
  • Preparation method of polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance
  • Preparation method of polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment is to prepare zeolite imidazolate framework-8 material (ZIF-8) by solvothermal method, and the specific steps are:

[0033] (1) 0.94g of Zn(NO 3 ) 2 ·6H 2 O is dissolved in 40mLMeOH / DI mixed solution (20mLMeOH and 20mLDI) with magnetic stirring to obtain zinc nitrate solution;

[0034] (2) 2.0762 g of 2-methylimidazole (HmIM) was dissolved in 20 mL of methanol with magnetic stirring to obtain a 2-methylimidazole solution;

[0035] (3) After fully dissolving, pour the zinc nitrate solution in step (1) into the 2-methylimidazole solution in step (2), and magnetically stir for 120 min;

[0036] (4) The mixed solution obtained in step (3) is centrifuged, washed with methanol for 4 times, and then put into a 60° C. oven to dry to obtain ZIF-8 crystals, and the obtained ZIF-8 crystals are characterized to obtain ZIF-8 crystals. Electron microscope photographs, such as figure 1 As shown, from the electron micrographs, a granular ZIF-8 material with good sh...

Embodiment 2

[0039]In this example, the ZIF-8 particles in Example 1 are used to further prepare a polyvinylidene fluoride mixed matrix film, and the specific preparation method is as follows:

[0040] (1) Dissolve ZIF-8, PVP, and PVDF after removing the guest molecules in DMAC, the composition ratio is: PVDF:ZIF-8:PVP=10:0.1:3, stir at 80°C to fully dissolve, Stand for defoaming for 24 hours;

[0041] (2) Scrape the casting solution of step (1) on a glass plate to a film with a thickness of 150 μm;

[0042] (3) Immerse the glass plate with the film solution in step (2) into deionized water at 15°C for phase separation;

[0043] (4) Soak the membrane after phase separation in step (3) in deionized water for 3 to 8 days to remove excess solvent, and then put it into clean deionized water for storage to obtain a polyvinylidene fluoride mixed matrix membrane, which is designated as ZIF-8 / PVDF ultrafiltration membrane.

[0044] The structure of the obtained ZIF-8 / PVDF ultrafiltration membr...

Embodiment 3

[0046] In this example, the ZIF-8 particles in Example 1 are used to further prepare a polyvinylidene fluoride mixed matrix film, and the specific preparation method is as follows:

[0047] (1) Dissolve ZIF-8, PVP, and PVDF after removing the guest molecules in DMAC, the composition ratio is: PVDF:ZIF-8:PVP=20:0.3:3, stir at 80°C to fully dissolve, Stand for defoaming for 24 hours;

[0048] (2) Scrape the casting solution of step (1) on a glass plate to a film with a thickness of 180 μm;

[0049] (3) Immerse the glass plate with the membrane solution in step (2) in deionized water at 20°C for phase separation;

[0050] (4) Soak the membrane after phase separation in step (3) in deionized water for 3 to 8 days to remove excess solvent, and then put it into clean deionized water for storage to obtain a polyvinylidene fluoride mixed matrix membrane, which is designated as ZIF-8 / PVDF ultrafiltration membrane.

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance. The method comprises the following steps: adding a zeolite imidazate skeleton-8 material prepared by a solvothermal method into a polyvinylidene fluoride membrane casting solution, and preparing the polyvinylidene fluoride mixed matrix membrane from the polyvinylidene fluoride membrane casting solution by a non-solvent induced phase separation method. Compared with the prior art, the method has the advantages that the prepared ultrafiltration membraneis excellent in anti-pollution performance, high in water flux, simple in preparation method and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a preparation method of a polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance. Background technique [0002] Membrane separation technology is a popular green separation technology in recent years. Polyvinylidene fluoride (PVDF) is one of the preferred materials for making ultrafiltration membranes due to its heat resistance, corrosion resistance, radiation resistance, outstanding dielectric properties and chemical stability. Zeolite imidazolate framework (ZIF-8), as a class of metal-organic frameworks (MOFs), is a porous material with large specific surface area and adjustable molecular pore size. Nano-zeolite imidazolate framework is used in selective separation, catalysis, adsorption and other fields Has great potential. [0003] Chinese patent (authorized publication number: CN103623714A) discloses a method for preparing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12C02F1/44
CPCB01D67/0011B01D67/0013B01D69/12B01D61/145C02F1/444B01D2325/30B01D2325/38B01D2323/04
Inventor 陈桂娥刘连静许振良
Owner SHANGHAI INST OF TECH
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