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A kind of water-changing covalent organic framework material and its preparation method and application

A technology of covalent organic skeleton and discoloration in contact with water, applied in the direction of chemical reaction of materials, material analysis, material analysis by optical means, etc., can solve the problem of unfavorable large-scale synthesis, difficult reaction and long synthesis time And other issues

Active Publication Date: 2021-04-13
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103755588A discloses a novel covalent organic framework photocatalyst and its preparation method. The invention uses trimesaldehyde and 2,5-bis(N,N-dimethyl)amino-1,4-benzenedihydrazide as Synthetic monomers are prepared by solvothermal method to prepare covalent organic framework materials. This method takes a long time to synthesize, the reaction is difficult to control, and it is not conducive to large-scale synthesis.

Method used

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  • A kind of water-changing covalent organic framework material and its preparation method and application
  • A kind of water-changing covalent organic framework material and its preparation method and application
  • A kind of water-changing covalent organic framework material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 A covalent organic framework material that changes color when exposed to water

[0018] (1) Preparation method

[0019] Disperse 1 mL of 1,3,5-trimethylbenzene, 1 mL of dioxane, and 0.5 mL of glacial acetic acid in 0.3 mL of distilled water to form a mixed solution. Disperse 21.6mg (1mmol) p-phenylenediamine and 10.8mg (1.5mmol) triformylphenol in the above mixed solution, stir evenly at room temperature for 0.5h, let stand, filter, and wash the obtained solid powder with tetrahydrofuran and acetone in turn , and vacuum-dried at 80°C for 12 hours to obtain a yellow powder, which is a covalent organic framework material that changes color when exposed to water.

[0020] (2) Detection

[0021] figure 1 is the XRD diffraction pattern of the product and the XRD diffraction pattern of the simulated product, by figure 1 It can be seen that the simulated spectrum and the product spectrum are consistent, indicating that the prepared material has a correct structur...

Embodiment 2

[0023] Example 2 Discoloration performance of a covalent organic framework material that changes color when exposed to water

[0024] Method: Weigh 100 mg of the covalent organic framework material prepared in Example 1 and place it under different humidity for 10 minutes, then carry out the solid ultraviolet-visible spectrum test.

[0025] image 3 It is the UV-visible spectrum diagram of the covalent organic framework material that changes color when exposed to water prepared in Example 1. Under different humidity, the UV-visible spectrum of the material changes to a certain extent. It can be found from the figure that under the influence of moisture Under the condition of 500nm-750nm, the ultraviolet-visible absorption of the material's ultraviolet-visible spectrum is obviously enhanced, which leads to the color change, but under the humidity condition of 6%, the ultraviolet-visible absorption change is not obvious, and the other humidity is uniform. produce more pronounce...

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Abstract

The invention relates to a water-changing covalent organic framework material, a preparation method and application thereof. First, p-phenylenediamine and triformylphenol were used as synthetic monomers to synthesize covalent organic framework materials by solid-phase method at room temperature. The covalent organic framework material of the present invention has a large specific surface area and rich pore structure. It forms hydrogen bonds with water molecules to change its energy level, thereby changing its color, and expands the new role of covalent organic framework materials in the field of catalysis. application, and the preparation method has the advantages of simple process, easy repeated operation, controllable structure, suitable for large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of porous materials, in particular to a method for preparing a covalent organic framework material that changes color when exposed to water, and expands the potential application of the covalent organic framework material. Background technique [0002] Covalent organic framework materials are crystalline porous materials formed by covalent bonding of light elements such as C, N, O, B, and Si. Because COF has high stability, structural regularity, pore adjustability, and easy functionality, Therefore, it can be applied in the fields of gas storage, drug release, catalysis and optoelectronics. [0003] Recently, covalent organic frameworks, as a new type of porous carbon-based materials, have attracted much attention due to their unique properties such as rigid structure (two-dimensional or three-dimensional), low density, high stability, and large specific surface area and voids. These characteristics make i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00G01N21/31G01N21/81
CPCC08G83/008G01N21/31G01N21/81G01N2021/775
Inventor 韩正波高明亮
Owner LIAONING UNIVERSITY