A universal two-dimensional rare earth MOFs material and its solvent-free chemical exfoliation method and application

A universal, solvent-free technology, which is applied in the analysis of materials, material analysis by electromagnetic means, material analysis by optical means, etc., can solve the problems of harsh synthesis conditions, achieve simple synthesis methods, relatively mild conditions, and produce high rate effect

Active Publication Date: 2022-06-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rare earth ions have high coordination characteristics, RE-MOFs usually exhibit more complex coordination geometries, and due to their harsh synthesis conditions
The development of novel fabricated 2DRE-MOFs nanosheets remains a challenge

Method used

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  • A universal two-dimensional rare earth MOFs material and its solvent-free chemical exfoliation method and application
  • A universal two-dimensional rare earth MOFs material and its solvent-free chemical exfoliation method and application
  • A universal two-dimensional rare earth MOFs material and its solvent-free chemical exfoliation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of solvent-free chemical exfoliation method of TEAB quaternary ammonium salt-assisted, hierarchical structure bulk rare earth MOFs material, comprises the following steps:

[0048] (1) Eu(NO 3 ) 3 .6H 2 O, trimesic acid and TEAB were mixed in a molar ratio of 1:1:5, and ground for 5 minutes to obtain a mixture;

[0049] (2) Put the mixture in step (1) into a polytetrafluoroethylene reactor, and heat it for 48 hours at a temperature of 160° C. to obtain a product with a hierarchical block shape;

[0050] (3) After the product obtained in step (2) was cooled to room temperature, it was washed with distilled water and ethanol three times in sequence, and then dried at 60°C for 2 hours to obtain a Eu-MOFs material sample, which was named sample 1.

[0051] see figure 2 , the crystal morphology of the Eu-MOFs material obtained in this example is a hierarchical structure block, and the average crystallite size of the Eu-MOFs material is about 10 μm.

Embodiment 2

[0053] A kind of solvent-free chemical exfoliation method of TPAB quaternary ammonium salt-assisted, hierarchical structure bulk rare earth MOFs material, comprises the following steps:

[0054] (1) Eu(NO 3 ) 3 .6H 2 O, trimesic acid and TPAB are mixed in a molar ratio of 1:1:5, and ground for 10 minutes to obtain a mixture;

[0055] (2) Put the mixture in step (1) into a polytetrafluoroethylene reactor, and heat it for 48 hours at a temperature of 160° C. to obtain a product with a hierarchical block shape;

[0056] (3) After the product obtained in step (2) was cooled to room temperature, it was washed with distilled water and ethanol three times in sequence, and then dried at 60°C for 2 hours to obtain a Eu-MOFs material sample, which was named sample 2.

[0057] see image 3 , the crystal morphology of the Eu-MOFs material obtained in this example is a hierarchical structure block, and the average crystallite size of the rare earth Eu-Fs material is about 3 μm.

Embodiment 3

[0059] A kind of solvent-free chemical exfoliation method of TBAB quaternary ammonium salt assisted, accordion-shaped rare earth MOFs material, comprises the steps:

[0060] (1) Eu(NO 3 ) 3 .6H 2 O, trimesic acid and TBAB were mixed in a molar ratio of 1:1:5, and ground for 6 minutes to obtain a mixture;

[0061] (2) Put the mixture in step (1) into a polytetrafluoroethylene reactor, and heat it for 48 hours at a temperature of 160° C. to obtain a product with an organ-shaped appearance;

[0062] (3) After the product obtained in step (2) was cooled to room temperature, it was washed with distilled water and ethanol three times in sequence, and then dried at 60°C for 2 hours to obtain a Eu-MOFs material sample, which was named sample 3.

[0063] see Figure 4 , the crystal morphology of the Eu-MOFs material obtained in this example is accordion-shaped, and the average size of the crystallites of the Eu-MOFs material is about 6 μm.

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Abstract

The invention discloses a universal two-dimensional rare earth MOFs material and its solvent-free chemical stripping method and application. By using different quaternary ammonium salts as morphology modifiers and intercalation stripping agents, in a solvent-free state, Through the mechanical grinding method and the heat treatment in the reactor, the effective regulation of the morphology of the rare earth MOFs material from 3D bulk to 2D two-dimensional sheet is realized. During this process, the quaternary ammonium salt is attached to the surface of the rare earth MOFs material, leading to the anisotropic growth of the rare earth MOFs material, and then forming ultrathin MOF nanosheets. The synthesis method of the rare earth MOFs material provided by the present invention is not only simple, high yield, and relatively mild conditions, but also meets the material performance requirements of 2D rare earth MOFs materials in fluorescence and sensing applications, and has the prospect of large-scale production.

Description

technical field [0001] The invention belongs to the technical field of rare earth nanoporous crystalline materials, and in particular relates to a universal two-dimensional rare earth MOFs material and a solvent-free chemical stripping method and application thereof. Background technique [0002] In recent years, two-dimensional (2D) sheet-like nanomaterials have attracted much attention due to their extremely large surface areas and unique physical and chemical properties. Metal-organic frameworks (MOFs for short) are nanoporous crystalline materials constructed of metal ions or clusters and organic bridging ligands. Important material in many fields of application. Among them, 2D metal-organic framework (2D MOFs) nanosheets have attracted great research interest due to their excellent performance in gas separation, energy conversion and storage, catalysis, and sensing. 2D rare-earth metal-organic frameworks (2D RE-MOFs) materials are also widely used in optical fields su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00G01N21/17G01N27/00
CPCC08G83/008G01N21/17G01N27/00
Inventor 徐燕刘佳强
Owner NORTHEASTERN UNIV LIAONING
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