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A kind of magnetic sandwich structure metal-organic framework material and its preparation method

A metal-organic framework and sandwich technology, applied in the direction of alkali metal compounds, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of poor regeneration performance of materials, achieve strong adsorption capacity, avoid loss, strong adsorption and immobilization Effect

Active Publication Date: 2021-03-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the existing materials cannot guarantee better catalytic performance of the adsorbent at the same time, and the regeneration performance of the material is poor, the present invention provides a magnetic sandwich structure capable of simultaneously ensuring better catalytic performance of the adsorbent and better regeneration performance of the material Preparation method of metal organic framework

Method used

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  • A kind of magnetic sandwich structure metal-organic framework material and its preparation method
  • A kind of magnetic sandwich structure metal-organic framework material and its preparation method
  • A kind of magnetic sandwich structure metal-organic framework material and its preparation method

Examples

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Effect test

Embodiment 1

[0042] The preparation process of the magnetic sandwich structure metal-organic framework in this example includes the following steps:

[0043] 1) Dissolve 334mg of anhydrous zirconium chloride and 250mg of terephthalic acid in 100mL of N,N-dimethylformamide, add 5mL of acetic acid, and continue heating at 120°C for 24 hours in a hydrothermal reactor. The particles obtained from the reaction were washed with N,N-dimethylformamide and centrifuged three times. Washing with methanol three times, each time for 24 hours, and vacuum drying at 150° C. for 12 hours to obtain UiO-66 particles, using the UiO-66 particles in step 1) as the inner core of the metal-organic framework with a sandwich structure;

[0044] 2) Dissolve 1.625g of anhydrous ferric chloride and 1g of trisodium citrate in 76mL of polyethylene glycol and 4mL of ethylene glycol solution. Add 4.1g of anhydrous sodium acetate to the solution, heat and stir in an oil bath at 120°C for 1 hour, place the resulting soluti...

Embodiment 2

[0055] The removal of tetracycline hydrochloride by using the magnetic sandwich structure metal-organic framework prepared in this example comprises the following steps:

[0056] a) 50mg UiO-66@Fe 3 o 4 @UiO-66 particles were added to 100mL tetracycline hydrochloride solution with a concentration of 1mg / L, shaken at 180rpm for 24 hours, after adsorption saturation, the particles were recovered by a magnet, and the surface layer of the particles was washed with water. Detect the concentration of tetracycline hydrochloride remaining in the solution, and the removal rate of tetracycline by the material is 99%;

[0057] b) Add the particles after adsorption in step a) to 100mL of distilled water, adjust the pH to 3.5 with 0.1mmol / L hydrochloric acid, and then add 1mL of 0.2mol / L H 2 o 2 Solution, shaking at 150rpm for 2 hours for Fenton-like reaction; cleaning UiO-66@Fe 3 o 4 @UiO-66 particle surface, dry at 100°C for 12 hours;

[0058] Utilize Fe in the material sandwich st...

Embodiment 3

[0075] The preparation process of the magnetic sandwich structure metal-organic framework in this example includes the following steps:

[0076] 1) Dissolve 334mg of anhydrous zirconium chloride and 250mg of terephthalic acid in 100mL of N,N-dimethylacetamide, add 7mL of acetic acid, and continue heating at 120°C for 24 hours in a hydrothermal reactor. The particles obtained from the reaction were washed with N,N-dimethylacetamide and centrifuged three times. Then wash with ethanol three times, each time for 24 hours, and vacuum-dry at 150°C for 12 hours to obtain UiO-66 particles.

[0077] 2) Dissolve 1.219g of anhydrous ferric chloride and 0.75g of trisodium citrate in 74mL of polyethylene glycol and 8mL of ethylene glycol solution. Add 3 g of anhydrous sodium acetate to the solution, heat and stir in an oil bath at 120° C. for 1 hour. The resulting solution was placed in a hydrothermal reactor and heated at 180°C for 12 hours. Wash with ethanol, centrifuge, and vacuum dr...

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Abstract

The invention discloses a magnetic sandwich structure metal-organic framework material and a preparation method, and belongs to the field of material synthesis. The material core of the present invention is MOFs, and the MOFs core is coated with a layer of nanometer Fe 3 O 4 particles, and nano Fe 3 O 4 There is a thin layer of MOFs outside the particles. The preparation method of the material of the present invention includes the following steps: MOF particles are placed in MOF precursor liquid and dispersed ultrasonically to obtain suspension A; 3 O 4 The particles and polyvinylpyrrolidone are dispersed in a polar solvent and dispersed ultrasonically to obtain suspension B; suspension A and suspension B are mixed and dispersed ultrasonically, and then heated with vibration in a water bath to obtain the prepared sandwich structure particles, which are separated by magnetic The desired granules are obtained, washed and dried. The material of the present invention can simultaneously ensure excellent adsorption and catalytic performance, and the adsorbed material can obtain better regeneration performance.

Description

technical field [0001] The invention belongs to the field of material synthesis, and relates to a metal-organic framework material with a magnetic sandwich structure and a preparation method. Background technique [0002] Metal Organic Frameworks (MOFs) are supramolecular structures with regular spatial configuration formed by the self-assembly of metals or metal clusters and organic ligands. Due to its large specific surface area, regular pore structure, high modifiability, and flexible designability, it has been widely used in the fields of adsorption, catalysis, proton conduction, and sensor preparation. Some water-stable MOFs can effectively adsorb and degrade dissolved organic pollutants in water by utilizing their abundant functional groups and well-developed pore structure. [0003] The Chinese patent application number is CN201810130028.5, and the application with the publication date of 2018.06.26 discloses a preparation method of a carbon-dot modified metal-organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00B01J20/22B01J20/28B01J20/30B01J31/16B01J35/00B01J37/00C02F1/28C02F1/72C02F101/30
CPCB01J20/226C02F1/285C02F1/722C02F1/725C08G83/008B01J20/28009B01J20/30B01J31/1691B01J37/00C02F2101/30B01J35/33
Inventor 张炜铭尹越任逸单超吕路花铭潘丙才
Owner NANJING UNIV
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