A method for COFs thin films to achieve high-efficiency gas separation through post-synthetic modification

A technology for separating gases and thin films, which is applied in separation methods, semipermeable membrane separation, and dispersed particle separation, etc., to achieve the effects of easy processability, low raw material cost, and simple operation

Active Publication Date: 2021-09-21
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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  • A method for COFs thin films to achieve high-efficiency gas separation through post-synthetic modification
  • A method for COFs thin films to achieve high-efficiency gas separation through post-synthetic modification
  • A method for COFs thin films to achieve high-efficiency gas separation through post-synthetic modification

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 present invention provides a method for realizing high-efficiency gas separation by the COFs film. The COFs film material is formed by the interface reaction between the organic solution and the glass bottle wall; Post-synthesis modification is carried out, and metal ions and grafted molecules are introduced for chelation coordination, so as to effectively divide the pores of COFs thin films. Such COFs thin film materials are synthesized by the liquid-solid interface method, which is universal. The operation is simple, the cost of raw materials is low, and it has large-scale processability, and its thickness, pore environment and gas separation performance can be effectively regulated by controlling the concentration of reactants, catalysts and introduced graft molecules. The prepared COFs thin film material Separation of H at normal temperature and pressure 2 / CO 2 Larger gas fluxes were shown in the mixed gas test.

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 Patents(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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