A preparation method of peg/zif-8/pvdf layer-by-layer assembled desulfurization membrane
A ZIF-8, layer-by-layer assembly technology, which is applied in the field of pervaporation desulfurization, can solve problems such as interface defects and particle agglomeration, and achieve the effects of improved desulfurization performance, tight interlayer bonding, and improved permeability and selectivity
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Embodiment 1
[0026] A method for preparing a PEG / ZIF-8 / PVDF layer-by-layer assembled desulfurization membrane, comprising the steps of:
[0027] After drying polyvinylidene fluoride in an oven at 110°C for 24 hours, prepare a polyvinylidene fluoride triethyl phosphate solution with a mass fraction of 15%, filter it while it is hot at 70°C, and let it stand at room temperature for defoaming to obtain a casting solution , using water as a gel bath, using the immersion precipitation phase inversion method to obtain a polyvinylidene fluoride base film supported by a polyester non-woven fabric, and finally immersing the base film in a 50% ethanol solution for 5 hours, taking it out and drying it naturally to obtain a polyvinylidene fluoride base film. Porous vinylidene fluoride bottom film with a thickness of 45nm.
[0028] Weigh 1.8g zinc nitrate hexahydrate and dissolve in 12g deionized water to form A solution, 34g 2-methylimidazole is dissolved in 120g deionized water to form B solution, st...
Embodiment 2
[0032] The difference from Example 1 is that after drying polyvinylidene fluoride in an oven at 110° C. for 24 hours, a triethyl phosphate solution of polyvinylidene fluoride with a mass fraction of 10% was prepared; 1.6 g of zinc nitrate hexahydrate was weighed and dissolved in 12g deionized water to form A solution, 32g 2-methylimidazole dissolved in 120g deionized water to form B solution, stir until fully dissolved, quickly mix A and B solutions; soak the polyvinylidene fluoride base film in the ZIF-8 suspension After 12 hours, take out the bottom film and rinse it with distilled water to wash off the unreacted 2-methylimidazole and ZIF-8 particles that have not grown firmly on the film. After drying in an oven at 60°C, immerse in the ZIF-8 suspension again, and repeat the process. The operation was performed 3 times to obtain the polyvinylidene fluoride base film of ZIF-8 grown in situ four times, and the configured polyethylene glycol casting solution was scraped and coat...
Embodiment 3
[0034]Different from Example 1, after drying polyvinylidene fluoride in an oven at 110° C. for 24 hours, a triethyl phosphate solution of polyvinylidene fluoride with a mass fraction of 20% was prepared; 2 g of zinc nitrate hexahydrate was weighed and dissolved in 12 g Form A solution in deionized water, dissolve 36g 2-methylimidazole in 120g deionized water to form B solution, stir until fully dissolved, quickly mix A and B solutions; soak the polyvinylidene fluoride base film in the ZIF-8 suspension After 12 hours, take out the bottom film and rinse it with distilled water to wash off the unreacted 2-methylimidazole and ZIF-8 particles that have not grown firmly on the film. After drying in an oven at 60°C, immerse in the ZIF-8 suspension again and repeat the operation. 4 times to obtain the polyvinylidene fluoride base film of in-situ growth ZIF-8 for five times, and scrape-coat the configured polyethylene glycol casting solution on the polyvinylidene fluoride base film grow...
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