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

Experimental program
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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-structured MOFs (metal-organic frameworks) material and a preparation method, and belongs to the field of material synthesis. The core of the material is MOFs, the MOFs core is coated with a layer of nano-Fe3O4 particles, and an MOFs thin layer is arranged outside the nano-Fe3O4 particles. The preparation method of the material comprises the following steps: putting MOF particles in an MOF precursor solution, and performing ultrasonic dispersion to obtain suspension A; dispersing Fe3O4 particles and polyvinylpyrrolidone in a polar solvent, and performing ultrasonic dispersion to obtain suspension B; mixing and ultrasonically dispersing the suspension A and the suspension B, performing water bath oscillation and heating to obtain sandwich-structured particles, performing magnetic separation to obtain needed particles, and cleaning and drying the particles. The material can have excellent adsorption and catalytic performance simultaneously, andthe material after adsorption can have 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
CPCB01J20/226B01J20/28009B01J20/30B01J31/1691B01J35/0033B01J37/00C02F1/285C02F1/722C02F1/725C02F2101/30C08G83/008
Inventor 张炜铭尹越任逸单超吕路花铭潘丙才
Owner NANJING UNIV
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