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A kind of preparation method of flexible graphene oxide/metal organic framework composite filter membrane

A metal-organic framework and composite filtration technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of MOFs shedding, no obvious improvement in filtration effect, and inability to maintain stable connection between MOFs and GO. Achieve the effects of easy assembly, improved retention performance, and excellent flexibility

Active Publication Date: 2021-12-14
TIANJIN UNIV
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Problems solved by technology

The inventor adopts the same method to prepare MOFs / GO composite membranes, according to the existing experimental data (data see appendix Figure 4-5 ), because this weak physical adsorption cannot maintain the stable connection between MOFs and GO, resulting in a large amount of MOFs falling off during the filtration process, and its filtration effect is not significantly improved compared with pure GO membranes.

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  • A kind of preparation method of flexible graphene oxide/metal organic framework composite filter membrane
  • A kind of preparation method of flexible graphene oxide/metal organic framework composite filter membrane
  • A kind of preparation method of flexible graphene oxide/metal organic framework composite filter membrane

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preparation example Construction

[0034] A method for preparing a flexible graphene oxide / metal-organic framework composite filter membrane; the specific preparation process includes the following steps:

[0035] 1) Weigh graphene oxide, zinc nitrate hexahydrate and 2-methylimidazole, add respectively in the same solvent, prepare uniform graphene oxide dispersion liquid, zinc nitrate solution and 2-methylimidazole solution, and zinc nitrate solution Add it into the graphene oxide dispersion liquid, then add the 2-methylimidazole solution, and mix evenly to obtain the precursor mixed liquid.

[0036] In step 1, the solvent can be deionized water, N,N-dimethylformamide (DMF) and its aqueous solution, methanol and its aqueous solution, etc.

[0037] In step 1, the mass ratio of graphene oxide, zinc nitrate hexahydrate and 2-methylimidazole is 1:(8-16):(9-18).

[0038] In step 1, the graphene oxide concentration range in the precursor mixed liquid is 0.2-0.5mg / mL, and the concentration of zinc nitrate (as ZnNO 3...

Embodiment 1

[0047] 1. Preparation of ZIF-8@GO / GO composite membrane

[0048] 1) Weigh graphene oxide, zinc nitrate hexahydrate and 2-methylimidazole (the mass ratio of the three is 1:8:9), and add them into deionized water respectively to prepare a uniform graphene oxide dispersion, zinc nitrate solution and 2-methylimidazole solution, adding zinc nitrate solution to the graphene oxide dispersion, then adding 2-methylimidazole solution, mixing evenly to obtain a precursor mixed solution, wherein the concentration of graphene oxide is 0.5mg / mL, zinc nitrate The concentration is 2.5mg / mL, and the concentration of 2-methylimidazole is 4.5mg / mL.

[0049] 2) Pour the precursor mixture into the reaction kettle, and heat it in an electric blast drying oven for 1 hour, set the temperature at 110°C to obtain a suspension of ZIF-8@GO composite particles, centrifuge the suspension, and wash , placed in an electric blast drying oven and dried to obtain gray-black ZIF-8@GO particles. Its SEM picture...

Embodiment 2

[0055] Preparation of ZIF-8@GO / GO Composite Membrane

[0056] 1) Weigh graphene oxide, zinc nitrate hexahydrate and 2-methylimidazole (the mass ratio of the three is 1:8:9), and add them into deionized water respectively to prepare a uniform graphene oxide dispersion, zinc nitrate solution and 2-methylimidazole solution, adding zinc nitrate solution to the graphene oxide dispersion, then adding 2-methylimidazole solution, mixing evenly to obtain a precursor mixed solution, wherein the concentration of graphene oxide is 0.2mg / mL, zinc nitrate The concentration is 1.0mg / mL, and the concentration of 2-methylimidazole is 1.8mg / mL.

[0057] 2) Pour the precursor mixture into the reaction kettle, and heat it in an electric blast drying oven for 1 hour, set the temperature at 170°C to obtain a suspension of ZIF-8@GO composite particles, centrifuge the suspension, and wash , placed in an electric blast drying oven and dried to obtain ZIF-8@GO particles.

[0058] 3) Evenly disperse g...

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Abstract

The invention relates to a preparation method of a flexible graphene oxide / metal organic framework composite filter membrane. Taking 2-methylimidazole zinc salt (ZIF‑8) as a typical metal-organic framework (MOFs), a chemically bonded 2-methylimidazolium zinc salt and graphene oxide composite was proposed to be prepared by hydrothermal and solvothermal methods. Particles (ZIF‑8@GO composite particles) are cross-linked and composited with GO to obtain a ZIF‑8@GO / GO composite film with graphene oxide as the matrix and composite particles as the reinforcement. The resulting composite membrane is self-supporting and remains intact under a limited amount of bending. The mesopores formed by the graphene oxide sheets, the micropores of the metal-organic framework, and the macropores formed by the addition of composite particles together endow the composite membrane with a hierarchical porous structure, which has a richer pore structure and improves the pollutant filtration performance. Experimental data show that the film is resistant to Pb 2+ And pollutants such as methylene blue show excellent retention performance.

Description

technical field [0001] The invention relates to a preparation method of a flexible graphene oxide / metal organic framework composite filter membrane (MOFs / GO composite membrane), which belongs to the technical field of preparation of flexible graphene oxide membrane and pollutant filtration. Background technique [0002] The development of modern industrial production has produced many pollutants that are harmful to the environment. These pollutants have posed a huge threat to the water supply of two-thirds of the world's population. Membrane separation technology is a kind of membrane material with selective permeability to separate the mixture through the energy difference on both sides of the membrane or its own selective permeability, so as to complete the separation, extraction, concentration or enrichment of different components. A separation technology based on the set has been widely used in the advanced treatment of sewage in recent years. [0003] Commonly used mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/02B01D71/06B01D71/10B01D71/16B01D71/34B01D71/36C02F1/28C02F1/44
CPCB01D71/021B01D71/06B01D69/12B01D67/0079B01D71/16B01D71/10B01D71/34B01D71/36C02F1/44C02F1/285
Inventor 苏冬李博昆赵晓迪杨智杰黎姿
Owner TIANJIN UNIV