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MOF-74 hybrid shell structure material and ZIF-90@MOF-74 hybrid core-shell material

A ZIF-90, MOF-74 technology, applied in the field of metal organic frameworks, can solve the problems of long synthesis reaction process and time-consuming, inflexible control of the size and structure of core-shell crystal materials, and increased complexity.

Active Publication Date: 2021-06-18
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most commonly used method for the synthesis of hollow or core-shell materials is the template method, but these methods often require subsequent processing steps such as template removal. This method leads to inflexible control over the size and structure of core-shell crystal materials
Therefore, the rapid synthesis of hollow or core-shell MOF materials with controllable size and structure remains challenging.

Method used

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  • MOF-74 hybrid shell structure material and ZIF-90@MOF-74 hybrid core-shell material
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  • MOF-74 hybrid shell structure material and ZIF-90@MOF-74 hybrid core-shell material

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preparation example Construction

[0072] The first aspect of the present invention provides a method for preparing a MOF-74 hybrid shell structure material, comprising:

[0073] 1) Provide ZIF-90, dissolve ZIF-90 in alcohol to form ZIF-90 alcohol suspension;

[0074] 2) providing a precursor solution, which includes an organic ligand, an organic solvent, a nickel salt, water, a growth regulator, and an alkali;

[0075] 3) Mix the ZIF-90 alcohol suspension provided in step 1) with the precursor solution provided in step 2); prepare the MOF-74 hybrid shell structure material after reacting at 80-120°C for 3-9 minutes .

[0076] In the preparation method of the MOF-74 hybrid shell structure material provided by the present invention, in the step 1), ZIF-90 is provided, and ZIF-90 is dissolved in alcohol to form a ZIF-90 alcohol suspension. In one embodiment, the preparation method of ZIF-90 comprises: heating imidazole-2-carboxaldehyde and polyvinylpyrrolidone in a metal bath in a solvent, and then adding zinc ...

Embodiment 1

[0137] 1) Synthesis of 3-4 μm ZIF-90

[0138] Dissolve 360 ​​mg of imidazole-2-carbaldehyde and 37.5 mg of PVP in 12.5 mL of deionized water, stir and heat in a metal bath at 80 °C to dissolve completely, and cool to 40 °C after complete dissolution. Add 1.25 mL of 0.62 mol / L zinc nitrate solution, and stir on a magnetic stirrer for 10 minutes (500 rpm). The product was washed twice with ethanol, collected by centrifugation (5000rpm / min, 5min), and ultrasonically dispersed in 0.6mL of ethanol.

[0139] 2) Synthesis of 3-4 μm MOF-74 hybrid shell material

[0140] Add 0.688 mL of 0.073 mol / L 2,5-dihydroxyterephthalic acid in N,N-dimethylformamide solution, 0.45 mL of 1 mol / L aqueous solution of nickel nitrate hexahydrate, 14.25 μL of acetic acid and 0.375mL of 1mol / L sodium hydroxide standard solution, ultrasonically homogenize the flocculent precipitate produced in the above solution or until the solution is clear, add 0.6mL of the ZIF-90 ethanol suspension synthesized above,...

Embodiment 2

[0144] 1) Synthesis of 8-9μm ZIF-90

[0145] Dissolve 720mg of imidazole-2-carbaldehyde and 75mg of PVP in 25mL of deionized water, stir and heat in a metal bath at 80°C to completely dissolve, add 1mL of PBS buffer solution after complete dissolution, and cool to 40°C. Add 2.5 mL of 0.62 mol / L zinc nitrate solution, and stir on a magnetic stirrer for 10 minutes (500 rpm). The product was washed twice with ethanol, collected by centrifugation (5000rpm / min, 5min), and ultrasonically dispersed in 0.6mL of ethanol.

[0146] 2) Synthesis of 8-9 μm MOF-74 hybrid shell material

[0147] Add 0.688 mL of 0.073 mol / L 2,5-dihydroxyterephthalic acid in N,N-dimethylformamide solution, 0.45 mL of 1 mol / L nickel nitrate hexahydrate aqueous solution, 14.25 μL of acetic acid and 0.375mL of 1mol / L sodium hydroxide standard solution, ultrasonically homogenize the flocculent precipitate produced in the above solution or until the solution is clear, add 0.6mL of the ZIF-90 ethanol suspension sy...

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Abstract

The invention relates to the technical field of metal organic frameworks, in particular to an MOF-74 hybrid shell structure material and a ZIF-90@MOF-74 hybrid core-shell structure material. The preparation method of the MOF-74 hybrid shell structure material comprises the following steps of providing ZIF-90, and dissolving the ZIF-90 in alcohol to form a ZIF-90 alcohol suspension, providing a precursor solution, wherein the precursor solution comprises an organic ligand, an organic solvent, nickel salt, water, a growth regulator and alkali, mixing the ZIF-90 alcohol suspension provided in the step 1) with the precursor solution provided in the step 2), and reacting at the temperature of 80-120 DEG C for 3-9 minutes to obtain the MOF-74 hybrid shell structure material. The synthesis method disclosed by the invention is simple in step, short in time consumption, regular and uniform in sample morphology, and capable of flexibly adjusting the size and the structure.

Description

technical field [0001] The invention relates to the technical field of metal organic frameworks, in particular to a MOF-74 hybrid shell structure material and a ZIF-90@MOF-74 hybrid core-shell material. Background technique [0002] Metal-organic framework (MOF) is a crystalline material composed of metal clusters and organic ligands. Compared with mesoporous silica, zeolite and activated carbon, MOF has a regular pore structure, large specific surface area and adjustable structure. And morphology and other advantages, are widely used in gas storage and separation, heterogeneous catalysis, drug delivery and other fields. [0003] In terms of catalysis, MOFs are often used as carriers to load catalytically active substances, such as metal nanoparticles and enzymes. Due to the screening and activation of catalytic substrates by MOF and the protection of catalytically active substances, compared with original MOF and catalysts, MOF composites can exhibit better catalytic perfo...

Claims

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Application Information

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IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 卓联洋康安琪吴春辉
Owner SHANGHAI TECH UNIV
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