Method for preparing magnetic carbon material from core-shell metal organic framework

A metal-organic framework, organic framework technology, applied in separation methods, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of small specific surface area of ​​magnetic carbon materials, difficult to apply in the field of catalysis, and narrow application range, and achieves an increase in the number of materials. Diversity, beneficial to industrial production, simple and fast preparation method

Inactive Publication Date: 2017-05-24
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The specific surface area of ​​the prepared magnetic carbon material is small, and the specific surface area is 200-450m 2 / g, restricts its application
[0007] 2. The selected carbonization precursor is only Fe-MIL-101 or Fe-MIL-100, and the scope of the method is relatively narrow
[0008] 3. The metal component in the prepared magnetic material only contains iron oxide, which makes it difficult to apply the material in the field of catalysis

Method used

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  • Method for preparing magnetic carbon material from core-shell metal organic framework
  • Method for preparing magnetic carbon material from core-shell metal organic framework
  • Method for preparing magnetic carbon material from core-shell metal organic framework

Examples

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Embodiment 1

[0037] Using Fe-MOF as the core and MOF-5(Zn) as the shell to prepare Fe-Zn core-shell MOF, and using Fe-Zn core-shell MOF as the precursor, magnetic carbon materials with high specific surface area were prepared by high-temperature carbonization.

[0038] The metal element in Fe-MOF is iron (Fe), and the coordinated organic compound is terephthalic acid. The preparation method of this substance is to weigh 1.6230g ferric chloride hexahydrate and 0.8405g trimesic acid and dissolve them in 40mL distilled water , add 4 drops of fluoboric acid dropwise, stir evenly and transfer to a high-pressure reactor with tetrafluoroethylene liner, react at 150°C for 24 hours to obtain the product, and obtain Fe-MOF after vacuum drying at 150°C for 12 hours.

[0039] Preparation of Fe-Zn core-shell MOF First prepare the reaction solution of MOF-5(Zn), dissolving 2.9749g zinc nitrate hexahydrate and 0.8310g terephthalic acid in 80mL N,N-dimethylformamide solution, Add 4 drops of fluoboric acid...

Embodiment 2

[0042] The main method is the same as in Example 1, the difference is that this example uses another metal organic framework material Co-MOF as the core, MOF-5 (Zn) as the shell to prepare Co-Zn core-shell MOF, and Co- Zn core-shell MOF is used as the precursor, and magnetic carbon materials with high specific surface area are prepared by high-temperature carbonization.

[0043] The metal element in Co-MOF is cobalt (Co), and the coordinated organic compound is terephthalic acid. The preparation method of this substance is to dissolve 2.9103g cobalt nitrate hexahydrate and 0.8310g terephthalic acid in 80mL N,N- Dimethylformamide solution, stirred evenly and transferred to a high-pressure reactor with a tetrafluoroethylene liner, reacted at 100°C for 24 hours to obtain the product, and obtained Co-MOF after vacuum drying at 100°C for 4 hours.

[0044] Preparation of Co-Zn core-shell MOF First prepare the reaction solution of MOF-5(Zn), dissolve 2.9749g zinc nitrate hexahydrate ...

Embodiment 3

[0047] The main method is the same as in Example 1, the difference is that in this example, Ni-MOF, another metal-organic framework material, is used as the core and MOF-5(Zn) is used as the shell to prepare Ni-Zn core-shell MOF, and Ni- Zn core-shell MOF is used as the precursor, and magnetic carbon materials with high specific surface area are prepared by high-temperature carbonization.

[0048] The metal element in Ni-MOF is nickel (Ni), and the coordinated organic compound is trimesic acid. The preparation method of this substance is to dissolve 1.4560g nickel nitrate and 0.8306g trimesic acid in 80mL N,N-dimethyl In the base formamide solution, stir evenly and transfer to a high-pressure reactor with a tetrafluoroethylene liner, react at 100 ° C for 48 hours to obtain the product, and obtain Ni-MOF after vacuum drying at 100 ° C for 4 hours. Analyzed by powder X-ray diffraction (see image 3 ), it is found that there are obvious diffraction peaks, indicating that the Co-...

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Abstract

The invention discloses a method for preparing a magnetic carbon material from a core-shell metal organic framework. The method comprises the following steps: ultrasonically dissolving an organic ligand and metal salt in a solvent in sequence, dropwise adding 2 to 10 drops of fluoboric acid, transferring the mixture into a polytetrafluoroethylene lining reaction kettle, carrying out reaction in a drying oven, and carrying out filtering and drying to obtain a metal-organic framework material; ultrasonically dissolving an organic ligand and metal salt which are used for synthesizing a 'shell' material in the solvent in sequence, dropwise adding 2 to 10 drops of fluoboric acid, adding the metal-organic framework material serving as a core, then transferring the mixture into the polytetrafluoroethylene lining reaction kettle, carrying out reaction in the drying oven, and carrying out filtering and drying to obtain a core-shell metal organic framework material; carrying out high temperature carbonization heating on the core-shell metal organic framework material to obtain the magnetic carbon material. The carbon material obtained through the method is regular in porous structure, uniform in aperture distribution and magnetic, and has good application value for the aspects such as gas adsorption storage and industrial waste separation; furthermore, the method is simple and feasible in preparation process and high in safety.

Description

[0001] 【Technical field】 [0002] The invention relates to a method for preparing a high specific surface area magnetic carbon material with a core-shell metal organic framework. [0003] 【Background technique】 [0004] Metal-organic framework materials are topological structures formed by self-assembly of organic ligands and metal ions, which have structural designability and adjustability, in which the organic ligands have a high carbon content. The core-shell metal-organic framework material is a core-shell structure assembled with a certain metal-organic framework as the core and another metal-organic framework as the shell. The core-shell structure can combine the advantages of two different materials, and the corresponding core-shell structure can be designed according to actual needs. Because of their high specific surface area and electrical conductivity, and high chemical and thermal stability, carbon materials are currently of great value in the fields of adsorption,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/20B01J20/28B01D53/02B01J23/80B01J35/10
CPCB01J20/20B01D53/02B01J20/28009B01J20/28064B01J23/002B01J23/80B01J35/0033B01J35/1023B01J35/1042B01J35/1047B01J35/1061
Inventor 林小英林松烨郑琴琴金雨来林剑涛
Owner FUJIAN UNIV OF TECH
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