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Metal organic framework and covalent organic framework composite membrane and preparation and application thereof

A technology of covalent organic framework and metal organic framework, applied in the field of composite membrane

Active Publication Date: 2021-11-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ZIF-8 is an inorganic membrane material, and intercrystalline defects and lattice flexibility often cause problems such as low selectivity. Therefore, the development of precise and effective ZIF-8 membrane preparation and membrane structure regulation methods is expected to make frame molecular sieve membranes in the field of propylene / propane separation. be further developed

Method used

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  • Metal organic framework and covalent organic framework composite membrane and preparation and application thereof
  • Metal organic framework and covalent organic framework composite membrane and preparation and application thereof
  • Metal organic framework and covalent organic framework composite membrane and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1, prepare MOF-COF composite film, the steps are as follows:

[0016] Step 1, preparation of EBCOF nanosheets by interfacial polymerization:

[0017] Dissolve 0.1 mmol of trialdehydephloroglucinol (TP) in 130 mL of dichloromethane. Then 80 mL of deionized water was added to the surface of the Tp solution as a buffer layer. Finally, 0.15 mmol of ethidium bromide (EB) and 0.3 mmol of p-toluenesulfonic acid (PTSA) were dissolved in 130 mL of water and slowly added on top of the aqueous buffer layer. The system was maintained at 30°C for 10 days under undisturbed conditions. Collect the two-dimensional sheets formed at the interface (with a lateral dimension of 5-30 μm and a thickness of about 3 nm), and dialyze with deionized water for 3 days to obtain two-dimensional cationic EBCOF nanosheets.

[0018] Step 2. Preparation of MOF-COF composite film by co-deposition method:

[0019] Anodized aluminum oxide (AAO) was used as the base film, and the surface of A...

Embodiment 2

[0021] Example 2, preparation of MOF-COF composite membrane, the preparation process of this example is basically the same as that of Example 1, the only difference is that in step 2, the mass of EBCOF nanosheets added to the co-deposition solution is changed from 0.2mg to 0.6mg (that is, the relative mass of EBCOF nanosheets and 2-methylimidazole is 1.46×10 -4 ) to obtain a MOF-COF composite film with a thickness of about 360 nm, which is designated as film 2.

[0022] Use membrane 2 for C 3 h 6 / C 3 h 8 System separation, under the conditions of 25°C and feed gas pressure 1bar, C 3 h 6 Penetration rate is 168GPU, C 3 h 6 / C 3 h 8 The selectivity is 203.

Embodiment 3

[0023]Example 3, preparation of MOF-COF composite film, the preparation process of this example is basically the same as that of Example 1, the only difference is that in step 2, the mass of EBCOF nanosheets added to the co-deposition solution is changed from 0.2 mg to 0.8mg (that is, the relative mass of EBCOF nanosheets and 2-methylimidazole is 1.95×10 -4 ) to obtain a MOF-COF composite film with a thickness of about 360 nm, which is denoted as film 3.

[0024] Use membrane 3 for C 3 h 6 / C 3 h 8 System separation, under the conditions of 25°C and feed gas pressure 1bar, C 3 h 6 Penetration rate is 110GPU, C 3 h 6 / C 3 h 8 The selectivity is 136.

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Abstract

The invention discloses a metal organic framework and covalent organic framework (MOF-COF) composite membrane prepared by a codeposition method. The composite membrane is composed of ZIF-8 and two-dimensional cation EBCOF nanosheets. The preparation method comprises the following steps: taking trialdehyde phloroglucinol and ethidium bromide as monomers, preparing the EBCOF nanosheet through an interfacial polymerization method; and adding the EBCOF nanosheet into a ZIF-8 precursor solution of 2-methylimidazole and Zn ions to serve as an MOF-COF co-deposition solution, immersing the platinum-sprayed AAO-based membrane into the co-deposition solution to serve as a cathode, depositing under a constant current, washing with deionized water and methanol, and drying to obtain the MOF-COF composite membrane. The method is simple, convenient, mild and controllable. The prepared MOF-COF composite membrane is used for separation of a C3H6 / C3H8 system, and has ultrahigh C3H6 / C3H8 selectivity and high C3H6 permeation rate at the same time. The framework composite membrane has a good application prospect in olefin production and purification.

Description

technical field [0001] The invention relates to a metal-organic framework and a covalent organic framework composite membrane, its preparation and application, and belongs to the technical field of composite membranes. Background technique [0002] Olefins are among the world's most produced chemicals, with more than 200 million tons produced globally each year, and are the cornerstone of many important manufacturing industries. According to statistics, the annual energy consumption of olefin / alkane separation accounts for about 0.3% of the total global energy consumption. The development of efficient olefin and alkane separation technology is of great significance to the sustainable development of modern chemical industry. Membrane technology is one of the most promising gas separation technologies due to its advantages in energy saving and environmental protection. However, traditional membrane materials have a tradeoff effect in which permeability and selectivity trade o...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/72B01D67/00B01D53/22C08G83/00C08G12/08
CPCB01D69/125B01D71/72B01D53/228C08G83/008C08G12/08
Inventor 姜忠义吴洪刘玉涛
Owner TIANJIN UNIV
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