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Zeolite imidazole metal-organic frameworks and preparation method and application thereof

A metal-organic framework and zeolite imidazole technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of small specific surface area, small pore size, and poor dispersion of ZIFs materials

Inactive Publication Date: 2019-09-13
YANBIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of small specific surface area, poor dispersion or small pore size of existing ZIFs materials, and provide a kind of zeolite imidazole metal organic framework material and its preparation method

Method used

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  • Zeolite imidazole metal-organic frameworks and preparation method and application thereof
  • Zeolite imidazole metal-organic frameworks and preparation method and application thereof
  • Zeolite imidazole metal-organic frameworks and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Preparation of zeolite imidazole metal organic framework material ZIF-F

[0020] It is obtained by using zinc acetate dihydrate and 2-methylimidazole as raw materials, using water as a solvent, and stirring and reacting at room temperature. The product is recorded as ZIF-F; the specific process is as follows:

[0021] 1) Weigh 0.27g of zinc acetate dihydrate and dissolve it in 15mL of distilled water to obtain zinc source solution;

[0022] 2) Weigh 0.41 g of 2-methylimidazole and dissolve it in 15 mL of distilled water to obtain a 2-methylimidazole solution;

[0023] 3) Under stirring, pour the 2-methylimidazole solution into the zinc source solution, and continue to stir at room temperature for 24 hours; after the reaction, centrifuge at 10,000 rpm for 10 minutes, discard the supernatant, then wash with distilled water for 3 times, and then centrifuge with methanol Wash once, and finally dry at 75°C for 12 hours to obtain a white powdery solid product, whic...

Embodiment 2

[0024] Example 2 Structural characterization and performance testing of ZIF-F

[0025] 1. Scanning electron microscope analysis (SEM)

[0026] figure 1 For the SEM of the synthesized ZIF-F material of the present invention; By figure 1 It can be seen that the ZIF-F material presents a butterfly shape and is uniformly dispersed;

[0027] 2. X-ray powder diffraction analysis (XRD)

[0028] figure 2 For the XRD of the synthesized ZIF-F material of the present invention; By figure 2 It can be seen that the ZIF-F material has a good crystallinity, and the existing literature has reported zeolite imidazole metal organic framework materials ZIF-8 and ZIF-L, which are the same as the organic ligand solution used in the present invention, but compared by XRD It can be seen that the material of the present invention is a new material different from ZIF-8 and ZIF-F.

[0029] 3. Thermogravimetric analysis (TG);

[0030] image 3 Be the TG of the ZIF-F material synthesized by the...

Embodiment 3

[0035] Example 3 Congo red dye adsorption experiment

[0036] The ZIF-F and ZIF-8 synthesized by the present invention (as a control) are used to adsorb and remove the Congo red dye in the water body, and the specific implementation is as follows: Accurately weigh 10.0 mg each of the adsorbents ZIF-F and ZIF-8 in two 10 mL centrifuge tube, and then add 5.00 mL 1000 mg / L Congo red solution to it respectively, after static adsorption for 60 min, centrifuge, and measure the absorbance of the supernatant with a UV-visible spectrophotometer, as shown in Figure 5 As shown, the adsorption capacity of ZIF-F to Congo red is 190.5 mg / g, which is significantly better than the adsorption capacity (122.4 mg / L) of ZIF-8 to Congo red, indicating that the ZIF-F synthesized by the present invention is in the field of adsorption and removal applications has certain advantages.

[0037] In summary, the butterfly-shaped zeolite imidazole metal-organic framework material ZIF-F synthesized by the...

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Abstract

The invention discloses zeolite imidazole metal-organic frameworks ZIF-F, which is prepared by the following method: 1) dissolving zinc acetate dehydrate in water to obtain a zinc-source solution; 2)dissolving 2-methylimidazole in water to obtain a 2-methylimidazole solution; 3) adding the2-methylimidazole solution into the zinc-source solution while stirring, and continuously stirring at room temperature for 20-30 h; centrifuging at 8,000-15,000 rpm for 8-12 min, abandoning a supernatant, washing, and drying at 70-80 DEG C for 10-15 h to obtain the zeolite imidazole metal-organic frameworksZIF-F. In the preparation process, water is used as a solvent, and the use of an acid-base solution is not involved. The raw materials are cheap and easily available; the synthesis process is simple;the reaction condition is mild; the yield is high; and repeatability is good. The product is butterfly-shaped and is uniformly dispersed; the average pore diameter is 4 nm; and heat stability and solvent stability are good.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a zeolite imidazole-based metal-organic framework material and its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs) are a new class of porous materials with a three-dimensional repeating network structure formed by self-assembly of organic ligands and metal ions. Compared with traditional inorganic porous materials, MOFs materials have larger specific surface area, structural diversity, adjustable pore size and variable functional groups. Existing MOFs materials have been used in hydrogen storage, drug delivery, catalytic reactions, Biosensors, gas adsorption and separation, etc. [0003] Among them, Zeoliticimidazolateframeworks (ZIFs) with a silica-alumina molecular sieve structure have become "star MOFs" due to their stable properties, large specific surface area, and easy synthesis, and have attracted extensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01J20/22
CPCB01J20/226C08G83/008
Inventor 商海波金春鑫李东浩姚丹阳
Owner YANBIAN UNIV
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