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Preparation method and separation performance research of polymer-covalent organic framework material (polyCOF) composite films

A covalent organic framework and polymer technology, which is applied in the field of polymer-covalent organic framework material (polyCOF) composite membrane preparation and separation performance research, can solve the problems of preparing polyCOFs materials that have not been reported, and achieve good commercial value and Industrial application prospect, simple operation and conditions, high yield effect

Inactive Publication Date: 2018-12-18
NANKAI UNIV
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  • Application Information

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Problems solved by technology

However, the introduction of polymer materials into COFs materials and the preparation of polyCOFs materials have not been reported yet.

Method used

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  • Preparation method and separation performance research of polymer-covalent organic framework material (polyCOF) composite films
  • Preparation method and separation performance research of polymer-covalent organic framework material (polyCOF) composite films
  • Preparation method and separation performance research of polymer-covalent organic framework material (polyCOF) composite films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthesize polyCOF membrane at the interface, the specific implementation steps are as follows:

[0026] The synthesis of polyCOF membranes mainly adopts a three-component condensation reaction: monomers containing amino groups and polymer-containing monomers are doped with monomers containing aldehydes. For example, diamino monomer (0.0375 mmol) is dissolved in a mixed solution of 1 mL of water and 1 mL of 1,4-dioxane, and placed at the bottom of the beaker. Weighed trialdehyde (0.025 mmol) and dissolved it in 3 mL of mesitylene, added 0.525 mL of acetic acid, put the mixed solution into a beaker and placed it on the upper layer, and reacted at room temperature for 48 h to obtain a polyCOF film with a yield higher than 80%.

[0027] Drying and activation of polyCOF membrane:

[0028] Soak the polyCOF membrane in methanol, fully exchange, then wrap the membrane with filter paper, dry the sample with a supercritical carbon dioxide dryer, and cool and exchange for about ...

Embodiment 2

[0033] Example 2: Flux of polyCOF membrane and separation test of pollutants in water

[0034] The prepared polyCOF membrane is cut into the required size with a mold as required, and then installed in the filter head for later use. The test uses a differential pressure test with a test pressure of 1 bar. Different liquids are added, and the flux is calculated by measuring the time and the volume of the liquid flowing out. Calculation formula: P=V / (A·t·p), unit: (Lm -2 h -1 bar -1 )]. P: flux, V: volume, A: membrane area, t: test time, p: pressure.

[0035] Separation of Escherichia coli from sewage with polyCOF membrane

[0036] The sewage containing Escherichia coli was passed through the filter membrane at a pressure of 0.5 bar, and the filtrate was cultured in the culture medium as a control, and it was found that there was almost no Escherichia coli in the solution.

[0037] Separation of dyes from sewage by polyCOF membrane

[0038] The sewage containing Co...

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Abstract

Novel polymer-covalent organic framework (polyCOF) film materials with a high machinability, a high chemical stability and a high crystallinity are creatively designed and synthesized against the problems of poor chemical stability and uneven pore size of traditional polymeric films and the problems of poor machinability and poor chemical stability of covalent organic framework films. A series ofpolyCOF films are prepared by introducing a polymer containing a construction monomer, and the polyCOF films integrates the advantages (such as high crystallinity, high porosity and high stability) ofa covalent organic framework material with the advantages (such as easy film formability, high flexibility and high machinability) of a linear polymer. The amount of polymeric reactants is adjusted to adjust the crystallinity, the porosity and the mechanical performances of the polyCOF films, and the concentration of reaction raw materials can be adjusted to adjust the thickness of the films. More importantly, the polyCOF films can be used for separating and purifying mixed gases, all organic molecules and biological pollutants.

Description

technical field [0001] The invention belongs to the field of separation membranes, and specifically relates to the preparation of polymer-covalent organic framework (polyCOF: polymer-Covalent-Organic-Framework) membranes with high machinability by using an interface method. By adjusting the ratio of polymer monomers, it can Effectively control the crystallinity, machinability and specific surface area of ​​polyCOF; by adjusting the concentration of reactive monomers, the thickness of the film can be effectively regulated. The prepared membrane can be used for the separation and purification of mixed gases, various organic molecules, and biological pollutants. Background technique [0002] Membrane separation has been widely used in food, medicine, environmental protection, chemical industry, energy, water treatment and other fields due to its high efficiency, energy saving, environmental protection and simple filtration process. However, traditional membrane materials are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/72B01D67/00C02F1/44B01D69/12
CPCB01D67/0002B01D69/12B01D71/72C02F1/44
Inventor 张振杰王志方
Owner NANKAI UNIV
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