ZIF-8/PVDF (Polyvinylidene Fluoride) ultra-filtration membrane with catalysis effect at room temperature and preparation method thereof

Abstract

The invention discloses a ZIF-8 / PVDF (Polyvinylidene Fluoride) ultra-filtration membrane with a catalysis effect at room temperature as well as a preparation method and application thereof. The preparation method comprises the following specific steps: (1) uniformly blending polyvinylidene fluoride, 2-methylimidazole, an additive and a solvent to prepare a membrane casting solution; (2) after stirring the membrane casting solution for 6h to 12h, standing and de-foaming for 8h to 12h; (3) taking an isopropyl alcohol water solution as a gel bath and adding zinc nitrate hexahydrate into the gel bath; (4) synthesizing ZIF-8 on a membrane at room temperature through an in-situ growth method, so as to obtain the ZIF-8 / PVDF ultra-filtration membrane with the catalysis effect. The method disclosedby the invention has a simple membrane preparation technology and can be used for effectively preventing particles from being agglomerated; on the basis, the membrane also has the certain catalysis effect and has a high interception rate on an ovalbumin salt water solution (OVA salt water solution) and a good interception flux; the method is a novel method for preparing the ultra-filtration membrane with the catalysis effect by utilizing an MOF (Metal Organic Framework).

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and relates to a ZIF-8 / PVDF ultrafiltration membrane with catalytic action at normal temperature and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of separation technology that allows one or more components in the mixture to pass through the membrane under the action of a driving force to achieve the separation of the mixture and the extraction, purification, and classification of the product. Ultrafiltration membrane is a membrane separation process driven by pressure difference. It has the advantages of high flux, simple preparation process, and low operating pressure. Since it entered industrial application, it has become the most widely used technology. [0003] MOF is a new type of porous crystalline solid material based on the combination of metal ions and organic ligands through coordination bonds. Zeolite imidazole f...

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Problems solved by technology

[0007] Most of the above studies on the preparation methods of various ZIF-8 membranes use two methods of in-situ growth and interfacial polymerization, the operating pressure is relatively high, and the preparation process is complicated; the research also focuses on the combination of ZIF-8 and PAN to make ultrafiltration membranes, Combining ZIF-8 with polyamide to make nanofiltration membrane, combining ZIF-8 with polyamide to make reverse osmosis membrane, and so on, there is no research on the combination of ZIF-8 and PVDF to make ultrafiltration membrane. And there are few studies on membranes with catalytic properties.

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