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Porous COFs block material and application thereof in isomer separation

A technology of isomers and monomers, which is applied in the separation of different isotopic elements, separation methods, and separation of dispersed particles, can solve the problems of high energy consumption and unsatisfactory separation effects, and achieve simple operation and avoid unsatisfactory The effect of controlled evaporation and mild reaction conditions

Active Publication Date: 2020-05-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the same molecular formula and the same chemical bond, isomers often have the same or similar chemical properties. There are many kinds of isomers in organic compounds, but they need a clear molecular structure when they are used as synthetic intermediates or functional molecules. Therefore, the separation of such compounds faces more difficulties and challenges
Traditional methods include ordinary distillation, melting crystallization, freezing point method, and gas chromatography, but they often encounter the problems of high energy consumption and unsatisfactory separation effect

Method used

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  • Porous COFs block material and application thereof in isomer separation
  • Porous COFs block material and application thereof in isomer separation
  • Porous COFs block material and application thereof in isomer separation

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 1. Preparation of amphiphilic COFs particles

[0044] Add 0.708g (2mmol) 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 0.134g (1mmol) terephthalaldehyde to 20mL 1,2-dichlorobenzene and 20mL In the mixed solvent of trimethylbenzene, degassing treatment was carried out through three freeze-pump-thaw cycles. After the treatment, it was left to react in an oil bath at 120°C for 7 days. After the reaction, the precipitate was centrifuged and washed with anhydrous tetrahydrofuran. Extraction by Soxhlet extractor for 24 hours, and vacuum drying at 80° C. for 24 hours to obtain yellow amphiphilic COFs particles whose structural unit is represented by formula II (R=H).

[0045] Scanning electron microscopy was performed on the obtained yellow amphiphilic COFs particles, and the results were as follows: figure 1 As shown, its microscopic morphology presents a spherical structure with a size distribution of 5-15 μm. Simultaneously, the yellow powder that obtains is carried out co...

Embodiment 2

[0054] In step 2 of this example, at room temperature and a stirring speed of 11400 rpm, 17.5 mg of amphiphilic COFs particles were uniformly dispersed in 150 μL of 2% polyvinyl alcohol aqueous solution, and then added to 4 mg of amphiphilic cholesterol (n = 8) In 350 μL of mesitylene, the mixed solution obtained was fully mixed at a constant speed of 11400 rpm until a stable O / W type Pickering emulsion was formed, and the volume content of the aqueous phase in the gained Pickering emulsion was 30% (see Figure 10 ), the content of amphiphilic COFs particles is 0.035g / mL, and the content of amphiphilic cholesterol is 0.008g / mL. Other steps are identical with embodiment 1, obtain porous COFs bulk material (see Figure 11 ).

Embodiment 3

[0056] In step 2 of this example, at room temperature, 17.5 mg of amphiphilic COFs particles were uniformly dispersed in 250 μL of 2% polyvinyl alcohol aqueous solution at room temperature and at a stirring speed of 11400 rpm, and then added to a solution containing 4 mg In 250 μL mesitylene of amphipathic cholesterol (n=8), the mixed solution obtained is fully mixed at a constant speed of 11400 rpm until a stable O / W type Pickering emulsion is formed, and the volume content of the aqueous phase in the gained Pickering emulsion is 50%, the content of amphiphilic COFs particles is 0.035g / mL, and the content of amphiphilic cholesterol is 0.008g / mL. Other steps were the same as in Example 1 to obtain a porous COFs block.

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Abstract

The invention discloses a porous COFs block material and application thereof in isomer separation. The method comprises the following steps: firstly, adding 2, 4, 6-tri(4-aminophenyl)-1, 3, 5-triazine(TAPT) and a diformaldehyde monomer to prepare amphiphilic COFs particles through Shiff-base reaction, then using amphiphilic COFs particles as a surface active agent to prepare an O / W type Pickeringemulsion, taking the Pickering emulsion as a template, and preparing the porous COFs block material through freeze drying. The porous COFs block material disclosed by the invention has good chemicalstability and thermal stability, the porosity is adjustable and the density is controllable, the porous COFs block material has good mechanical properties, can be cut into materials with different geometrical shapes, can realize effective separation of 2-nitrotoluene, 4-nitrotoluene, 2-chloronitrobenzene, 4-chloronitrobenzene and other isomers, has separation and recovery efficiency reaching about80%, and can be recycled after separation.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a porous COFs block material and the application of the material in high-efficiency separation of isomers. Background technique [0002] Porous materials are playing an increasingly important role in the fields of catalysis, separation, emerging energy, and health technologies due to their large specific surface area, low density, light texture, and diverse structures. With the progress of human society and the development of science and technology, porous materials are constantly endowed with new requirements to meet human needs. Porous materials have experienced the development process from natural acquisition to artificial synthesis, from inorganic porous to organic-inorganic doped porous and then to porous organic materials. Covalent organic frameworks (COFs) are ordered crystalline porous materials composed of light elements such as C, O, N, and B linked by re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01J20/22B01D59/26B01J20/30C07C201/16C07C205/06C07C205/12
CPCC08G83/008C07C201/16B01J20/226B01D59/26C07C205/06C07C205/12
Inventor 彭军霞李薇吕洁丽宋泽涛
Owner SHAANXI NORMAL UNIV
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