The invention discloses a ZIF-8 / PDMS
mixed matrix pervaporation membrane as well as a preparation method and application thereof. The preparation method comprises the following steps of dissolving
zinc nitrate hexahydrate and 2-methylimidazole in a
solvent, uniformly mixing, and standing to obtain a ZIF-8 precursor solution, penetrating through a PVDF membrane through a suction
filtration method to obtain a PVDF membrane I with preset ZIF-8 seed crystals, placing a
zinc nitrate hexahydrate solution and a 2-methylimidazole solution on the two sides of the PVDF membrane with the preset ZIF-8
seed crystal respectively through a
diffusion method for
diffusion crystallization, then taking out the membrane, washing and
drying, and acquiring a PVDF substrate membrane II with ZIF-8 crystals, mixing PDMS and a cross-linking agent to obtain a suspension liquid, then adding
dibutyltin dilaurate into the suspension liquid, and stirring the mixture to be uniform to obtain a membrane
coating liquid, and uniformly
coating the PVDF substrate membrane II with the ZIF-8 crystals with the membrane
coating liquid, cross-linking at normal temperature, and
drying to obtain the PVDF / ZIF-8
composite membrane. The ZIF-8 is loaded on the surface and in pore channels of the PVDF membrane by using a preset
seed crystal-pair
diffusion growth method, and the PVDF membrane is coated with PDMS to prepare a sandwich structure, so that the problem that the ZIF-8 is easy to aggregate in the PDMS membrane is solved.