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Ion exchange type COF-coated MOF/M composite material and preparation method thereof

A composite material and ion exchange technology, applied in the field of ion exchange COF@MOF/M composite material and its preparation, to achieve the effect of improving catalytic performance and degradation efficiency

Active Publication Date: 2021-04-06
苏州段造纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, experiments show that the degradation efficiency of molecular sieves is only about 50%, while that of COF@MOF composites is only about 80%.

Method used

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  • Ion exchange type COF-coated MOF/M composite material and preparation method thereof
  • Ion exchange type COF-coated MOF/M composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Synthesis of COF1@UiO-66 / Ti(Ⅳ) Composite

[0025] 1) Synthesis of UiO-66:

[0026] At room temperature, add DMF (75mL) and ZrCl in a 250mL round bottom flask 4(0.4 g,), acetic acid (2.85 mL, 850 mmol) was added to the solution during ultrasonic dispersion at 60°C. A solution of terephthalic acid (0.282 g) in DMF (25 mL) was added to the flask and finally deionized water (0.125 mL) was added. The mixed solution was tightly sealed, ultrasonically dispersed at 60°C for 10min, and heated and stirred in a constant temperature oil bath at 120°C for 24h. Then the solution was cooled to room temperature, and the precipitate was separated by centrifugation and washed with DMF (10mL) and purified three times by centrifugation. The obtained yellow solid powder was UiO-66, which was washed three times with methanol (10mL), and finally placed in an oven at 60°C. After drying for 24h, the UiO-66 sample was obtained.

[0027] 2) Synthesis of COF1@UiO-66:

[0028] At room temperat...

Embodiment 2

[0032] Synthesis of COF2@IRMOF-3 / Co composites

[0033] 1) Synthesis of IRMOF-3

[0034] Dissolve 3.0mmol of zinc nitrate hexahydrate and 0.85mmol of 2-aminoterephthalic acid in 20ml of DMF, ultrasonically disperse for 2min, then place the mixed solution in a reaction kettle, react at 110°C for 15h, and cool naturally to The product was separated by centrifugation at room temperature, washed three times with DMF and methanol, and dried in an oven at 50°C for 8 hours to obtain the IRMOF-3 sample.

[0035] 2) Synthesis of COF2@IRMOF-3

[0036] 40 mg of IRMOF-3 was dissolved in 1,2,4,5-tetrakis(4-formylphenyl)benzene (0.022 mmol) in 1,4-dioxane (2.5 mL) and stirred for 30 min until After becoming uniform, 1,3,5-tris(4-aminophenyl)benzene (TAPB, 0.02 mmol) and 30 μL acetic acid were added during ultrasonic dispersion, and ultrasonic dispersion was continued for 30 min. Then heated and stirred at 100°C for 48h, centrifuged to separate the product, washed three times with THF (te...

Embodiment 3

[0040] Synthesis of COF3@ZIF-67 / Fe

[0041] 1) Synthesis of ZIF-67

[0042] At room temperature, 1 mmol of Co(NO 3 )2·6H 2 O and 4mmol of 2-methylimidazole were dissolved in 25ml of ethanol, and ultrasonically dispersed for 30min. Then the two solutions were mixed, reacted in an oil bath at 120°C for 4 hours, cooled naturally to room temperature, centrifuged to separate the product, washed with ethanol and acetone three times, and dried in an oven at 85°C for 6 hours to obtain the ZIF-67 product.

[0043] 2) Synthesis of COF3@ZIF-67

[0044] Dissolve 50 mg of ZIF-67 in a solution of terephthalaldehyde (0.02 mmol) in 1,4-dioxane (2 ml) and stir for 1 hour until it becomes uniform, then add tetrakis (4 -Aminophenyl)methane (TAPB, 0.02mmol) and 18 μL of hydrocyanic acid, continued ultrasonic dispersion for 30min. Then heated and stirred at 150 °C for 50 h, centrifuged to separate the product, washed three times with 1,4-dioxane, deionized water and methanol, and dried in a v...

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Abstract

The invention discloses an ion exchange type COF-coated MOF / M composite material and a preparation method thereof, and the preparation method comprises the following steps: firstly synthesizing an MOF crystal material, then synthesizing a COF-coated MOF material, and finally introducing exchange metal ions to form the ion exchange type COF-coated MOF / M composite material. After the COF-coated MOF core-shell structure is synthesized, metal ions are fixed at nodes of the core-shell structure, so that the monatomic catalytic activity is exerted; MOF is coated with COF to form a COF-coated MOF core-shell structure, on one hand, a multi-stage pore channel structure is formed, a layer-by-layer progressive effect is achieved when pollutant small molecules are adsorbed, a nano confinement effect is formed in the middle of a sheet layer, and the catalytic performance is improved, and on the other hand, due to the fact that the stable shell structure MOF of the COF cannot cause structural collapse in the metal ion exchange process, and the shape of the original framework is maintained; when the ion exchange type COF-coated MOF / M composite material prepared by the method disclosed by the invention is used for catalyzing styrene degradation, the degradation efficiency is obviously improved by more than 30%.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to an ion-exchange COF@MOF / M composite material and a preparation method thereof. Background technique [0002] Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have attracted attention in the past ten years due to their high specific surface area, excellent thermal stability, and functional and tunable interior and exterior materials. It has attracted extensive attention and has broad application prospects in the fields of catalysis, chemical separation, gas storage, drug delivery, and sensing imaging. [0003] The team of professors Pingyun Feng and Xianhui Bu from the University of California system developed an integrated COF@MOF collaborative assembly strategy, through MOF: [(M3-(OH)1-x(O)x(COO)6] type and COF :[B3O3(py)3]-type stacking. Using this strategy, the coordination-driven assembly of the acs configuration frame...

Claims

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Application Information

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IPC IPC(8): B01J31/16B01D53/86B01D53/72
CPCB01J31/1691B01D53/86B01D53/8668B01D2257/7027B01J35/30Y02C20/30
Inventor 栾奕杨珊珊
Owner 苏州段造纳米科技有限公司
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