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Core-shell structure material as well as preparation method and application thereof

A core-shell structure and shell technology, applied in the field of materials, can solve problems such as unstable structure, weak adsorption capacity, and single adsorption site

Pending Publication Date: 2022-03-22
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nowadays, most MOFs materials have relatively single adsorption sites, single adsorption performance, weak adsorption capacity, poor water resistance, and unstable structure, which limits the application of MOFs to a certain extent.

Method used

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  • Core-shell structure material as well as preparation method and application thereof
  • Core-shell structure material as well as preparation method and application thereof
  • Core-shell structure material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment discloses a core-shell structure material. The core-shell structure material is a hybrid ZIF-8@MIL-100(Fe) core-shell structure material. In the core-shell structure material, ZIF-8 and MIL- 100 (Fe) The ratio of the amount of substance is 1:1.

[0062] In this example, the above-mentioned core-shell structure material was prepared, and the specific process was as follows:

[0063] (1) Dissolve 4g of sodium hydroxide powder in 8mL of deionized water, completely dissolve to form a concentrated solution, and wait for it to cool down to room temperature to obtain a concentrated solution of sodium hydroxide;

[0064] (2) Slowly add 7g of trimesic acid powder into the obtained concentrated sodium hydroxide solution, stir with an iron spoon until the reaction is complete and cool to room temperature;

[0065] (3) Filtrate and recover the filtrate with a needle filter (water phase 0.22 μm);

[0066] (4) Add excessive absolute ethanol and produce white precipi...

Embodiment 2

[0084] This example prepares a core-shell structure material, the difference from Example 1 is that steps 14-16 are different, specifically:

[0085] (14) Dissolve sodium trimesate in dispersion I by weighing 0.82 g (the amount of substance is 3 mmol) to make dispersion II, and keep the ZIF-8 powder fully dispersed during the period;

[0086] (15) Weigh ferrous sulfate heptahydrate and dissolve it in 50mL deionized water at a concentration of 0.89g / 50mL (the concentration of the corresponding substance is 3.2mmol / 50mL), and make an aqueous solution of ferrous sulfate;

[0087] (16) Add dispersion liquid II and ferrous sulfate aqueous solution to a 250mL Erlenmeyer flask with a cover, mix well, then transfer to a constant temperature shaker at a speed of 200rpm at 4°C and shake overnight (more than 8 hours). After the reaction is over, get Mixture II;

[0088] The coating ratio of the core-shell structure sample obtained in this example is 1:2.

Embodiment 3

[0090] This example prepares a core-shell structure material, the difference from Example 1 is that steps 14-16 are different, specifically:

[0091] (14) Weigh and dissolve sodium trimesate in dispersion I, add 1.64 g (the amount of substance is 6 mmol), make dispersion II, and keep the ZIF-8 powder fully dispersed during the period;

[0092] (15) Weigh ferrous sulfate heptahydrate and dissolve it in 50mL deionized water at a concentration of 1.78g / 50mL (the concentration of the corresponding substance is 6.4mmol / 50mL), and make an aqueous solution of ferrous sulfate;

[0093] (16) Add dispersion liquid II and ferrous sulfate aqueous solution to a 250mL Erlenmeyer flask with a cover, mix well, then transfer to a constant temperature shaker at a speed of 200rpm at 4°C and shake overnight (more than 8 hours). After the reaction is over, get Mixture II;

[0094] The coating ratio of the core-shell structure sample obtained in this example is 1:4.

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Abstract

The invention discloses a core-shell structure material as well as a preparation method and application thereof. The core-shell structure material is a hybrid core-shell structure material and comprises a core and a shell, the core comprises ZIF-8, and the shell comprises MIL-100. Compared with a single MOFs material, the core-shell structure material disclosed by the invention has the characteristic of various adsorption sites, can adsorb various substances, and is high in adsorption capacity. Moreover, as the micropore and mesopore properties of the ZIF-8 and the MIL-100 are different, the core-shell structure material disclosed by the invention can adsorb two or more substances with different sizes.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a core-shell structure material and a preparation method and application thereof. Background technique [0002] In the past few decades, metal-organic frameworks (MOFs) self-assembled from organic ligands and metal nodes have made this type of composite materials popular in many fields due to their mild synthesis conditions, structural diversity, high stability, and large specific surface area. It plays an important role in the separation, storage and adsorption process. As one of the most attractive MOFs, ZIF-8 is often used as an adsorbent to remove pollutants in wastewater due to its easy synthesis, unique pore structure, and excellent thermal / chemical stability. However, nowadays, most MOFs materials have relatively single adsorption sites, single adsorption performance, weak adsorption capacity, poor water resistance, and unstable structure, which limit the ap...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02C02F1/28B01J31/22
CPCB01J20/226B01J20/28016B01J20/28064B01J20/28066B01J20/28061B01D53/02C02F1/285B01J31/1691B01J31/1815B01J31/2239B01J2531/26B01J2531/842Y02W10/37
Inventor 郑裕基钟钰琨穆学良江腾
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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