Preparation method of polyvinylidene fluoride mixed matrix membrane with high flux and strong pollution resistance
A technology of mixed matrix membrane and polyvinylidene fluoride, applied in the field of membrane separation, can solve problems such as insufficient anti-pollution property, and achieve the effects of excellent anti-pollution property, enhanced hydrophilicity, and mild preparation process conditions
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Embodiment 1
[0032] The present embodiment adopts solvothermal method to prepare zeolite imidazolate framework-8 material (ZIF-8), and the specific steps are:
[0033] (1) 0.94g of Zn(NO 3 ) 2 ·6H 2 Dissolve in 40mL MeOH / DI mixed solution (20mL MeOH and 20mLDI) under 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) pour the zinc nitrate solution of step (1) into the 2-methylimidazole solution in step (2) after fully dissolving, magnetic stirring 120min;
[0036] (4) centrifuge the mixed solution obtained in step (3), wash it with methanol for 4 times, put it into a 60° C. oven to dry to obtain ZIF-8 crystals, and characterize the obtained ZIF-8 crystals to obtain ZIF-8 crystals. Electron micrographs, such as figure 1 As shown, the granular ZIF-8 material with good morphology can be obtained from the electron microscope photo...
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 guest molecules in DMAC, and the composition ratio is: PVDF:ZIF-8:PVP=10:0.1:3. After stirring at 80°C to fully dissolve, Stand for defoaming for 24h;
[0041] (2) scraping the film casting liquid of step (1) on a glass plate to a film with a thickness of 150 μm;
[0042] (3) immersing the glass plate with the film liquid in step (2) into 15° C. deionized water for phase separation;
[0043] (4) Soak the membrane transfer ionized water after phase separation in step (3) for 3 to 8 days to remove excess solvent, and then put it into clean deionized water for preservation to obtain a polyvinylidene fluoride mixed matrix membrane, which is denoted as ZIF-8 / PVDF ultrafiltration membrane.
[0044] The structure of the obtained ZIF-8 / PVDF ultraf...
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 guest molecules in DMAC, and the composition ratio is: PVDF:ZIF-8:PVP=20:0.3:3. After stirring at 80°C to fully dissolve, Stand for defoaming for 24h;
[0048] (2) scraping the film casting liquid of step (1) on a glass plate to a film with a thickness of 180 μm;
[0049] (3) immersing the glass plate with the film liquid in step (2) into 20° C. deionized water for phase separation;
[0050] (4) Soak the membrane transfer ionized water after phase separation in step (3) for 3 to 8 days to remove excess solvent, and then put it into clean deionized water for preservation to obtain a polyvinylidene fluoride mixed matrix membrane, which is denoted as ZIF-8 / PVDF ultrafiltration membrane.
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