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Three-dimensional graphene/COFs composite material as well as preparation method and application thereof

A composite material, graphene technology, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve problems that violate the vision of green environmental protection and economic effects, consume energy, and improve rapid separation characteristics and stability, improve mechanical strength, enhance the effect of rapid separation characteristics

Active Publication Date: 2020-09-01
INST OF VEGETABLE & FLOWERS CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of three-dimensional graphene materials provided by related technologies mostly requires high reaction temperature and pressure to complete the self-assembly of graphene oxide, which not only consumes a lot of energy, but also violates people's environmental protection and environmental protection. Vision of Economic Effects

Method used

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  • Three-dimensional graphene/COFs composite material as well as preparation method and application thereof
  • Three-dimensional graphene/COFs composite material as well as preparation method and application thereof
  • Three-dimensional graphene/COFs composite material as well as preparation method and application thereof

Examples

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preparation example Construction

[0036] The preparation method of the three-dimensional graphene hydrogel of the present invention comprises: mixing and dissolving at least one of ascorbic acid and hydrazine hydrate with graphene oxide, and stirring with magnetic force until a black solid product is generated. Specifically, dissolve graphene oxide and ascorbic acid in ultrapure water, and ultrasonicate for about 5 minutes to completely dissolve the solid particles; then mix and disperse the above mixed solution with a certain volume of high-purity water, and heat and continue stirring for 1 hour under magnetic stirring There is enough until a black solid product is generated; then centrifuged, washed with absolute ethanol and pure water for about three times, and freeze-dried for about 48 hours.

[0037] In a preferred embodiment, graphene oxide and ascorbic acid are used for mixing and dissolving; wherein, the volume ratio of the volume of ultrapure water, the quality of graphene oxide, the quality of ascorbi...

Embodiment 1

[0044] Preparation of three-dimensional graphene hydrogel: First, graphene oxide and ascorbic acid were dissolved in 10 mL of ultrapure water, and the solid particles were completely dissolved by ultrasonication for 5 min. Secondly, the above mixed solution and a certain volume of high-purity water were dispersed into a 250mL three-necked flask, and heated and stirred continuously for 1h under magnetic stirring until a black solid product was formed. Finally, it was separated by high-speed centrifugation, washed three times alternately with absolute ethanol and pure water, and dried in a freeze dryer for 48 hours.

[0045] Wherein, graphene oxide: ascorbic acid: high-purity water: reaction temperature: centrifugal revolution number is:

[0046] 0.2g: 1.0g: 110mL: 90°C: 12000r / min.

[0047] Self-assembly of 3D graphene / COFs composites: Suspend the 3D graphene hydrogel in 20mL DMSO and sonicate for 5min, then add DMSO solution containing trimesaldehyde and benzidine, after soni...

Embodiment 2

[0051] Preparation of three-dimensional graphene hydrogel: First, graphene oxide and ascorbic acid were dissolved in 9 mL of ultrapure water, and the solid particles were completely dissolved by ultrasonication for 6 min. Secondly, the above-mentioned mixed solution and a certain volume of high-purity water were dispersed into a 250 mL three-necked flask, and heated and stirred continuously for 1.2 h under magnetic stirring until a black solid product was formed. Finally, it was separated by high-speed centrifugation, washed four times alternately with absolute ethanol and pure water, and dried in a freeze dryer for 50 hours.

[0052] Wherein, graphene oxide: ascorbic acid: high-purity water: reaction temperature: centrifugal revolution number is:

[0053] 0.1g: 0.4g: 60mL: 65°C: 10000r / min.

[0054] Self-assembly of 3D graphene / COFs composites: Suspend the 3D graphene hydrogel in 18mL DMSO and sonicate for 6min, then add DMSO solution containing trimesaldehyde and benzidine,...

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Abstract

The invention relates to the technical field of environmental functional materials, in particular to a three-dimensional graphene / COFs composite material and a preparation method and application thereof. The preparation method comprises the following steps: suspending three-dimensional graphene hydrogel in dimethyl sulfoxide, performing mixing with a dimethyl sulfoxide solution containing benzenetricarboxaldehyde and benzidine, dropwise adding glacial acetic acid, and stirring at normal temperature until a green flocculent composite material is generated. According to the method, the investment of energy consumption can be reduced, and the requirements of environmental protection and economic effects are met; and the three-dimensional graphene / COFs composite material prepared by the methodcan be applied to efficient enrichment and separation of organic phosphorus.

Description

technical field [0001] The invention relates to the technical field of environmental functional materials, in particular to a three-dimensional graphene / COFs composite material, its preparation method and application. Background technique [0002] Organophosphorus pesticides are highly toxic to non-target substances (humans and animals), and most of the highly toxic and highly toxic organophosphorus pesticides used on vegetables have been included in the prohibited and restricted range; however, there are still organophosphorus pesticides in actual production Illegal use. Therefore, it is of great significance to establish high-efficiency pretreatment and adsorption enrichment materials for banned and restricted organophosphorus pesticides, and strictly control their residue levels to ensure the quality and safety of vegetable products. [0003] High-efficiency adsorbents can effectively enrich trace amounts of harmful substances from a large number of vegetable samples, im...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30
CPCB01J20/226B01J20/20B01J20/28014
Inventor 徐东辉刘广洋高宇航李凌云黄晓冬许晓敏林桓张延国
Owner INST OF VEGETABLE & FLOWERS CHINESE ACAD OF AGRI SCI
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