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Hydrophobic mesoporous nano material and preparation method thereof

A nanomaterial, water-mediated technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve problems such as limiting the application of materials, hindering diffusion, etc., to achieve stable hydrophobicity, simple equipment, and easy operation.

Pending Publication Date: 2022-05-10
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most MOFs only have micropores (less than 2nm), which will hinder the diffusion of larger adsorbates, precursors, reactants, catalysts, or drug molecules in the pores, limiting the application of this material.

Method used

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  • Hydrophobic mesoporous nano material and preparation method thereof
  • Hydrophobic mesoporous nano material and preparation method thereof
  • Hydrophobic mesoporous nano material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take a 50mL beaker, use a graduated cylinder to measure 27mL of N,N-dimethylformamide and pour it into the beaker, then weigh 349.5mg of zirconium chloride into the beaker, ultrasonically dissolve it for 30min, and then add 247.5mg into the beaker in turn Terephthalic acid, 0.25mL concentrated hydrochloric acid, 3622.5mg benzoic acid, and then ultrasonically dissolved for 10min. Afterwards, the solution in the beaker was transferred to a polytetrafluoroethylene-lined hydrothermal kettle, and reacted at 120°C for 24h. After the reaction, a milky white suspension was obtained, and the product was collected by centrifugation, then washed three times by centrifugation with N,N-dimethylformamide, three times by centrifugation with absolute ethanol, and then vacuum-dried at 150°C for 12 hours to obtain UIO-66. Weigh 200 mg of UIO-66 and disperse it into 20 ml of 0.8 mol / L acetic acid aqueous solution, then transfer it to a polytetrafluoroethylene-lined hydrothermal kettle, re...

Embodiment 2

[0055] Take a 50mL beaker, use a graduated cylinder to measure 27mL of N,N-dimethylformamide and pour it into the beaker, then weigh 349.5mg of zirconium chloride into the beaker, ultrasonically dissolve it for 30min, and then add 247.5mg into the beaker in turn Terephthalic acid, 0.25mL concentrated hydrochloric acid, 3622.5mg benzoic acid, and then ultrasonically dissolved for 10min. Afterwards, the solution in the beaker was transferred to a polytetrafluoroethylene-lined hydrothermal kettle, and reacted at 120°C for 24h. After the reaction, a milky white suspension was obtained, and the product was collected by centrifugation, then washed three times by centrifugation with N,N-dimethylformamide, three times by centrifugation with absolute ethanol, and then vacuum-dried at 150°C for 12 hours to obtain UIO-66. Weigh 200 mg of UIO-66 and disperse it into 20 ml of 2.4 mol / L aqueous acetic acid solution, then transfer it to a polytetrafluoroethylene-lined hydrothermal kettle, an...

Embodiment 3

[0057] Take a 50mL beaker, use a graduated cylinder to measure 27mL of N,N-dimethylformamide and pour it into the beaker, then weigh 349.5mg of zirconium chloride into the beaker, ultrasonically dissolve it for 30min, and then add 247.5mg into the beaker in turn Terephthalic acid, 0.25mL concentrated hydrochloric acid, 3622.5mg benzoic acid, and then ultrasonically dissolved for 10min. Afterwards, the solution in the beaker was transferred to a polytetrafluoroethylene-lined hydrothermal kettle, and reacted at 120°C for 24h. After the reaction, a milky white suspension was obtained, and the product was collected by centrifugation, then washed three times by centrifugation with N,N-dimethylformamide, three times by centrifugation with absolute ethanol, and then vacuum-dried at 150°C for 12 hours to obtain UIO-66. Weigh 200 mg of UIO-66 and disperse it into 20 ml of 3.2 mol / L aqueous acetic acid solution, then transfer it to a polytetrafluoroethylene-lined hydrothermal kettle, an...

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Abstract

The preparation method comprises the following steps: (1) reacting a mixed solution containing zirconium chloride, terephthalic acid, inorganic acid, aromatic monocarboxylic acid and N, N-dimethylformamide to obtain a metal organic framework material; (2) dispersing the metal organic framework material in a monocarboxylic acid solution for reaction to obtain a mesoporous metal organic framework material; and (3) dispersing the mesoporous metal organic framework material in n-heptane, adding low-molecular-weight polysiloxane, and curing to obtain the hydrophobic mesoporous material. Aromatic monocarboxylic acid benzoic acid is added in the process of synthesizing UIO-66 to cause defects at coordination sites, then monocarboxylic acid is used for carrying out ligand exchange on the coordination sites of UIO-66 and terephthalic acid at high temperature and high pressure, the defects are expanded, pore channels of several nanometers to dozens of nanometers are formed, and the UIO-66 is synthesized. And finally, carrying out cross-linking curing on the surface of the nano material by using low-molecular-weight polysiloxane under a vacuum condition to form a layer of hydrophobic membrane.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to the preparation of a hydrophobic mesoporous nanometer material. Background technique [0002] Metal-organic frameworks (MOFs) are a class of crystalline porous materials with a periodic network structure formed by the interconnection of metal centers and organic ligands through self-assembly. With the advantages of easy functional modification, it has broad application prospects in catalysis, adsorption separation, drug delivery, and immobilized enzymes. However, most MOFs only feature micropores (less than 2nm), which hinder the diffusion of larger adsorbates, precursors, reactants, catalysts, or drug molecules in the pores, limiting the application of this material. Therefore, there is a need to synthesize MOFs with mesoporous structures to overcome those limitations. [0003] However, in some fields, the improvement of the hydrophobicity of MOFs mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C08G83/00
CPCB01J20/226B01J20/28004B01J20/28007C08G83/008B01J2220/4806B01J2220/4812
Inventor 庄伟徐晓鹏饶远许敬亮王志应汉杰欧阳平凯刘金乐蔡亚凡王石磊张珂珂
Owner NANJING UNIV OF TECH
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