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A kind of MOF bulk porous material and its preparation method and application

A porous material and block technology, applied in the preparation of carboxylic acid nitriles, chemical instruments and methods, and the preparation of organic compounds, can solve problems such as reducing catalytic efficiency, hindering the contact between MOFs and reaction substrates, and limiting the application value of MOF materials. , to achieve the effect of simple preparation process, excellent oil absorption and catalytic performance, and environmental friendliness

Active Publication Date: 2022-02-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, the presence of polymers formed by the polymerization of monomers will hinder the contact between MOFs and reaction substrates, thereby greatly reducing their catalytic efficiency.
Even in some cases, MOFs are only used as nanoparticles to stabilize emulsions or as fillers in porous polymers, which severely limits the application value of MOF materials.

Method used

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  • A kind of MOF bulk porous material and its preparation method and application
  • A kind of MOF bulk porous material and its preparation method and application
  • A kind of MOF bulk porous material and its preparation method and application

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[0026] The present invention provides a kind of preparation method of MOF bulk porous material, comprises the following steps:

[0027] Mixing 2-methylimidazole, zinc nitrate hexahydrate, ZIF-8 nanoparticles and water to obtain an aqueous phase;

[0028] Using linear alkanes as the oil phase, adding the oil phase dropwise to the stirred water phase, and shearing the resulting mixture to form a high internal phase emulsion;

[0029] The high internal phase emulsion is freeze-dried to obtain MOF bulk porous material.

[0030] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0031] The invention mixes 2-methylimidazole, zinc nitrate hexahydrate, ZIF-8 nanoparticles and water to obtain the water phase. In the present invention, the preparation method of the ZIF-8 nanoparticles preferably includes the following steps: mixing 2-methylimidazole, nitric acid hexahydr...

Embodiment 1

[0048] 18.47g (0.22mol) 2-methylimidazole was dissolved in 135mL deionized water to obtain a 2-methylimidazole solution, and 1.116g (0.00375mol) zinc nitrate hexahydrate was dissolved in 15mL deionized water to obtain a zinc nitrate solution , drop the zinc nitrate solution into the 2-methylimidazole solution at room temperature, stir at 600rmp for 24h, centrifuge the resulting mixture at 10,000rmp for 5min, filter, and wash three times with deionized water to obtain ZIF -8 nanoparticles;

[0049] 1.23g 2-methylimidazole, 0.0744g zinc nitrate hexahydrate and 0.132g ZIF-8 nanoparticles were added to 2mL deionized water as the water phase; 12mL cyclohexane was used as the oil phase; the oil phase was added dropwise to In the water phase under stirring at 900rmp, after mixing evenly, the resulting mixed liquid was emulsified at 12000rmp for 60s using an Ultra Turrax T18 shear emulsifier to obtain a high internal phase emulsion; the high internal phase emulsion was freeze-dried to...

Embodiment 2

[0051] Adopt the ZIF-8 nanometer particle that embodiment 1 prepares;

[0052] 1.23g 2-methylimidazole, 0.0744g zinc nitrate hexahydrate and 0.264g ZIF-8 nanoparticles were added to 2mL deionized water as the water phase; 12mL cyclohexane was used as the oil phase; the oil phase was added dropwise to In the water phase under stirring at 900rmp, after mixing evenly, the resulting mixed liquid was emulsified at 12000rmp for 60s using an Ultra Turrax T18 shear emulsifier to obtain a high internal phase emulsion; the high internal phase emulsion was freeze-dried to obtain MOF blocks porous material.

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Abstract

The invention provides a MOF bulk porous material and a preparation method and application thereof, belonging to the technical field of porous material preparation. In the present invention, the aqueous solution containing dimethylimidazole, zinc nitrate hexahydrate monomer and pre-prepared ZIF-8 nanoparticles is used as the water phase, and cyclohexane is used as the oil phase, and the MOF bulk porous material is prepared by the emulsion template method. During the shear emulsification process, the pre-prepared ZIF‑8 nanoparticles acted as Pickering particles to stabilize the emulsion, and the newly formed ZIF‑8 coordinated with dimethylimidazole and zinc nitrate hexahydrate in the aqueous phase acted as a support for the porous material framework material, no need to add additional polymerizable monomers and surfactants, and only ZIF‑8 exists in the prepared MOF bulk porous material, which effectively avoids the impact of scaffolds or adhesives (polymers) on MOF in existing preparation methods. performance impact.

Description

technical field [0001] The invention relates to the technical field of porous material preparation, in particular to a MOF bulk porous material and its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs) are crystalline materials composed of metal ions or clusters linked by organic ligands. Since MOFs can be composed of different metal ions / clusters and different organic association structures, specific MOF compounds can be formed through rational molecular design, making them have characteristics such as high surface area and large pore volume. Therefore, MOFs have attracted extensive attention in the fields of adsorption, separation, catalysis, and sensors. At present, the preparation methods of MOFs include traditional solution method, hydrothermal method, liquid diffusion method and solid method, etc. A wide variety of MOF particles have been designed and synthesized for targeted applications, but processing MOF particles i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C08G83/00C07C253/30C07C255/34B01D15/08B01J20/22
CPCC08G83/008B01J31/1691B01J31/181C07C253/30B01J20/226B01D15/08B01J2231/341B01J2531/26C07C255/34
Inventor 章圣苗孙艳朱芸王彦华
Owner EAST CHINA UNIV OF SCI & TECH
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