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Method for realizing efficient gas separation of COFs film through modification after synthesis

A technology for separating gases and membranes, used in separation methods, semi-permeable membrane separation, dispersed particle separation, etc.

Active Publication Date: 2021-04-20
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no report on the work of significantly improving the gas separation performance by segmenting the channels of COFs membranes.

Method used

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  • Method for realizing efficient gas separation of COFs film through modification after synthesis
  • Method for realizing efficient gas separation of COFs film through modification after synthesis
  • Method for realizing efficient gas separation of COFs film through modification after synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Add TAPB and BPTA into a beaker filled with ethyl acetate, mix well to obtain solution A, wherein the concentration ratio of TAPB and BPTA is 2:3; Sc(OTf) 3 Add deionized water to the beaker and mix well to obtain Solution B. Among them, the concentration of aminoaromatic compounds in solvent II is 1-4 μM / mL, the concentration of aromatic aldehyde-based compounds in solvent II is 1.5-6 μM / mL, and the concentration of scandium trifluoromethanesulfonate in solvent I 0.5~2μM / mL.

[0060] (2) Slowly add solution B into a 50mL glass bottle, and then use a funnel to add solution A to solution B at a constant speed. After standing for 10 seconds, the solution will automatically separate into layers, seal the reaction system, and stand at 10°C for 15 days. TAPB-BPTA-COFs film material was generated in situ on the glass bottle wall. The reaction system and reaction process for preparing TAPB-BPTA-COFs film are as follows: figure 1 shown;

[0061] (3) Pour off the reactio...

Embodiment 2

[0076] (1) Using a 50mL glass bottle as a reaction vessel, dissolve p-azidobenzoic acid (N 3 -Ph-COOH), ascorbic acid (AA) and anhydrous CuSO 4 .

[0077](2) Place the TAPB-BPTA-COFs@PVDF membrane obtained above in a 3 -Ph-COOH solution system soaked for 2 to 4 hours, and then dissolved in ascorbic acid (AA) and anhydrous CuSO 4 The solution is fully mixed and added to the solution system of the azide compound, and the reaction temperature is controlled by a constant temperature oscillator, and the reaction time is 12 hours. This post-synthetic modification strategy is as Figure 7 shown.

[0078] (3) After the reaction, the COFs film was clamped out from the solution, soaked and washed with tetrahydrofuran for 3 to 5 times, and then dried under vacuum at 60°C for more than 12 hours to obtain COFs@PVDF-N 3 -Ph-COOH.

[0079] (4) Soak the dried membrane in 0.027mM / mL anhydrous Cu(CH 3 COO) 2 in methanol solution for 24 hours, and then dried under vacuum at 60°C for more...

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Abstract

The invention discloses a method for realizing efficient gas separation of a COFs film. A COFs film material is formed by an interface reaction between an organic solution and the wall of a glass bottle; after a film on the bottle wall is peeled off, post-synthetic modification is carried out on the film through a click reaction, metal ions are introduced to be chelated and coordinated with grafted molecules, and therefore, the pore channels of the COFs film material is effectively segmented; the COFs film material is synthesized through a liquid-solid interface method, and the method has the advantages of universality, easiness in operation, low raw material cost and large-scale processability; the thickness, the pore channel environment and the gas separation performance of the film material can be effectively regulated and controlled by controlling the concentrations of reactants, catalysts and introduced grafted molecules; and the prepared COFs film material shows large gas flux in a test of separating H2 / CO2 mixed gas under the conditions of normal temperature and normal pressure.

Description

technical field [0001] The invention belongs to the field of utilizing COFs thin film to achieve high-efficiency separation of gases. Specifically, by modifying the COFs thin film after synthesis to segment its pores, the pore diameter is effectively reduced and its gas separation performance is greatly improved, belonging to the field of gas membrane separation . Background technique [0002] With the increasing demand for clean energy supply, the efficient separation and purification of industrial energy gases has become a research field that has attracted much attention. At present, there are methods for separating gases such as adsorption, absorption, low temperature separation and membrane separation. [0003] First of all, "adsorption method" can be divided into pressure swing adsorption (PSA) and temperature swing adsorption (TSA) according to the different operation methods. Its advantages lie in its relatively simple process, large device operation flexibility, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08L87/00B01D71/78B01D71/82B01D69/02B01D67/00B01D53/22
CPCY02P20/151Y02C20/40
Inventor 王博冯霄井雪纯
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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