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Preparation method of MOFs-PVDF composite ultrafiltration membrane

An ultrafiltration membrane, mofs-pvdf technology, applied in the field of preparation of MOFs-PVDF composite ultrafiltration membrane, can solve the problems of many bacteria and microorganisms, the composite ultrafiltration membrane does not have bactericidal function, and threatens the health of drinking water, so as to achieve anti-pollution Strong ability, excellent bactericidal performance, and the effect of improving bactericidal performance

Pending Publication Date: 2021-04-23
NORTH & SOUTH BROTHER PHARMACY INVESTMENT CO LTD
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AI Technical Summary

Problems solved by technology

However, the composite ultrafiltration membrane does not have a bactericidal function
[0005] At present, in the process of preparing pure water with ultrafiltration membrane as reverse osmosis pretreatment, on the one hand, the ultrafiltration membrane can only adsorb proteins and tiny microorganisms in drinking water on the surface of the ultrafiltration membrane to prevent them from passing through, but cannot Kill it, so that the drinking water contains more bacteria and microorganisms, these various bacteria and microorganisms will seriously threaten the health of people's drinking water

Method used

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  • Preparation method of MOFs-PVDF composite ultrafiltration membrane
  • Preparation method of MOFs-PVDF composite ultrafiltration membrane

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preparation example Construction

[0032] 1. Preparation of hydroxyl-containing PVDF

[0033] The preparation method of the hydroxyl-containing PVDF can refer to CN107626216A. details as follows:

[0034] The PVDF is firstly treated with lye, and then the PVDF treated with lye is reacted in the isopropanol solution of sodium borohydride. After the reaction is completed, the PVDF is filtered and dried to obtain PVDF containing hydroxyl groups.

[0035] Specifically, the lye is an aqueous lithium hydroxide solution with a mass fraction of 3%; the reaction conditions for the lye treatment are: stirring and reacting at 25-60° C. for 36-72 hours.

[0036] Specifically, the mass fraction of the isopropanol solution of sodium borohydride is 0.1-1.5%, more preferably 0.2%; the reduction reaction conditions in the isopropanol solution of sodium borohydride are: stirring reaction at room temperature 18-36h.

Embodiment approach

[0037] According to some embodiments provided by the present invention, the preparation of the hydroxyl-containing PVDF specifically includes: immersing 50g of PVDF in an aqueous solution of 200g of lithium hydroxide (3% by mass fraction), stirring at 50°C for 48h, and then respectively using water (2000mL ) and isopropanol (2000mL) for washing; then the washed PVDF was added to 200g of sodium borohydride in isopropanol (0.2% by mass fraction), stirred at room temperature for 24h, filtered, and dried to obtain hydroxyl-containing PVDF .

[0038] 2. Preparation of modified MOFs materials

[0039] Add the MOFs material to the aqueous solution containing ferric nitrate and silver nitrate, stir and mix to obtain the precursor solution;

[0040] Add sodium hydroxide solution to the above precursor solution, stir, pass through oxidizing gas, filter, and dry to obtain the modified MOFs material loaded with AgO and FeOOH.

[0041] Preferably, the MOFs material is one of ZIF-8, MIL-1...

Embodiment 1

[0060] The preparation method of the MOFs-PVDF composite ultrafiltration membrane provided in this embodiment comprises the following steps:

[0061] (1) Preparation of modified MOFs materials

[0062] The MOFs material is ZIF-8, and in the obtained modified ZIF-8 material, the mass of AgO is 10% of the mass of ZIF-8, and the mass of FeOOH is 5% of that of ZIF-8.

[0063] Composition according to the above ratio, weigh Fe(NO 3 ) 3 and AgNO 3 Dissolve in water, stir for 30 minutes; then add ZIF-8, stir at room temperature for 1.5 hours to obtain a precursor solution;

[0064] Add mass fraction to the precursor solution and be 8% NaOH solution, stir again 15min; Pass into O then 2 / N 2 mixed gas, and continued to stir for 30 min, filtered and washed, and dried in vacuum at 60 °C for 4 h to obtain a modified ZIF-8 material loaded with AgO and FeOOH.

[0065] (2) Preparation of MOFs-PVDF composite ultrafiltration membrane

[0066] Based on the total mass of the casting solu...

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Abstract

The invention relates to the technical field of membrane separation, and provides a preparation method of an MOFs-PVDF composite ultrafiltration membrane with a sterilization function. The preparation method comprises the following steps of: adding an MOFs material into an aqueous solution containing an iron source and a silver source, and stirring and mixing to obtain a precursor solution; adding a sodium hydroxide solution into the precursor solution, stirring, introducing oxidizing gas, filtering and drying to obtain a modified MOFs material loaded with AgO and FeOOH; and adding hydroxyl-containing PVDF, a modified MOFs material and a pore-foaming agent into an organic solvent to prepare a membrane casting solution, applying the membrane casting solution, and carrying out gel curing in a non-aqueous coagulating bath to obtain the MOFs-PVDF composite ultrafiltration membrane with a sterilization function. The MOFs-PVDF composite ultrafiltration membrane prepared by the method is good in hydrophilicity and strong in anti-pollution capability, has sterilization and antibacterial functions, and can be applied to the field of water treatment.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a bactericidal MOFs-PVDF composite ultrafiltration membrane. Background technique [0002] Polymer separation membrane is a material used in contemporary high-efficiency separation, concentration, purification and purification equipment, and has been widely used in the fields of chemical industry, environmental protection, food, biology, pharmaceuticals, electronics, electric power, metallurgy, textiles, and seawater desalination. It plays an important role in contemporary energy, resources and solving environmental pollution problems. Commonly used mainly include polyvinylidene fluoride, polysulfone, polyvinyl chloride membrane materials, etc. [0003] Metal-organic frameworks (MOFs) are materials with a supramolecular microporous network structure formed by the metal-ligand complexation between organic ligands and metal ions. The internal ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D71/06B01D69/12B01D67/00B01D61/14
CPCB01D61/145B01D67/0013B01D69/12B01D71/06B01D71/78B01D2325/48
Inventor 邓成
Owner NORTH & SOUTH BROTHER PHARMACY INVESTMENT CO LTD
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