Preparation method of flexible graphene oxide/metal organic framework composite filter membrane

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

Active Publication Date: 2020-08-25
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 t

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  • Preparation method of flexible graphene oxide/metal organic framework composite filter membrane
  • Preparation method of flexible graphene oxide/metal organic framework composite filter membrane
  • Preparation method of flexible graphene oxide/metal organic framework composite filter membrane

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[0034] A preparation method of flexible graphene oxide / metal organic frame composite filter membrane; the specific preparation process includes the following steps:

[0035] 1) Weigh graphene oxide, zinc nitrate hexahydrate, and 2-methylimidazole, and add them to the same solvent to prepare uniform graphene oxide dispersion, zinc nitrate solution, and 2-methylimidazole solution. Add the graphene oxide dispersion, then add the 2-methylimidazole solution, and mix uniformly to obtain a precursor mixture.

[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 concentration of graphene oxide in the precursor mixture is 0.2-0.5mg / mL, and the concentration of zinc nitrate (in ZnNO 3 The range is 1.0-5.1mg / mL, and the concentration range of 2-methylimidazol...

Example Embodiment

[0046] Example 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 to deionized water to prepare a uniform graphene oxide dispersion, zinc nitrate solution and 2-methylimidazole solution, zinc nitrate solution is added to the graphene oxide dispersion, then 2-methylimidazole solution is added, and mixed evenly to obtain a precursor mixture, where the concentration of graphene oxide is 0.5mg / mL, zinc nitrate The concentration is 2.5 mg / mL, and the concentration of 2-methylimidazole is 4.5 mg / mL.

[0049] 2) Pour the precursor mixture into the reaction kettle and place it in an electric blast drying oven to heat for 1 hour, set the temperature to 110 ℃ to obtain a suspension of ZIF-8@GO composite particles, centrifuge the suspension and wash , Placed in an electric heating blast drying oven to dry, get gray-black ZIF-8@GO particles. Its SEM im...

Example Embodiment

[0054] Example 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 to deionized water to prepare a uniform graphene oxide dispersion, zinc nitrate solution and 2-methylimidazole solution, zinc nitrate solution is added to the graphene oxide dispersion, then 2-methylimidazole solution is added, and mixed uniformly to obtain a precursor mixture, where the concentration of graphene oxide is 0.2mg / mL, zinc nitrate The concentration is 1.0 mg / mL, and the concentration of 2-methylimidazole is 1.8 mg / mL.

[0057] 2) Pour the precursor mixture into the reaction kettle, and place it in an electric blast drying oven to heat for 1 hour, set the temperature to 170 ℃ to obtain a suspension of ZIF-8@GO composite particles, centrifuge the suspension, and wash , Placed in an electric heating blast drying oven to dry, get ZIF-8@GO particles.

[0058] 3) Disperse ...

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Abstract

The invention relates to a preparation method of a flexible graphene oxide/metal organic framework composite filter membrane. 2-methylimidazole zinc salt (ZIF-8) is used as a typical metal organic framework (MOFs), a hydrothermal method and a solvothermal method are used for preparing 2-methylimidazole zinc salt and graphene oxide composite particles (ZIF-8-coated GO composite particles) with chemical bonding, the composite particles and GO are subjected to cross-linking compounding, and the ZIF-8-coated GO/GO composite film with graphene oxide as a matrix and the composite particles as reinforcements is obtained. The obtained composite membrane can realize self-supporting, and can still keep complete under the bending action of a certain limit. Mesopores formed by the graphene oxide sheetlayer, micropores of the metal organic framework and macropores formed by adding the composite particles jointly endow the composite membrane with a hierarchical pore structure so that the compositemembrane has a richer pore channel structure, and the pollutant filtering performance is improved. Experimental data show that the membrane has excellent interception performance on pollutants such asPb < 2 + > and methylene blue.

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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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
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