A kind of amidated graphene airgel and its preparation method and application

A technology of carboxylated graphene and airgel, which is applied in the field of water treatment, can solve the problems of poor microbial affinity of graphene airgel materials, the graphene layer is easily exposed, and the purification effect cannot be achieved, and achieve strong heavy metal adsorption Performance and microbial affinity, beneficial to microbial attachment, and the effect of improving biocompatibility

Active Publication Date: 2022-05-13
PEKING UNIV
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Problems solved by technology

[0003] However, the existing technical solutions for preparing graphene airgel, on the one hand, because the oxygen-containing groups in the material are removed during the preparation process, the functional materials prepared can only adsorb hydrophobic organic matter, and for hydrophilic organic matter, microorganisms, etc. And pollutants such as heavy metal ions, can not achieve the purification effect; and encapsulation to kill microorganisms, or enter microbial cells to generate a large amount of active oxygen and cause severe oxidative stress. Therefore, the prepared graphene airgel material has poor microbial affinity and is difficult to apply to microbial systems for wastewater treatment.
[0004] Furthermore, traditional graphene aerogels use a reduction reaction to restore the π bonds on the graphene to connect different graphene layers, and this method also makes the sharp edges of the graphene layers easily exposed, and the weaker interlayer The force also makes the graphene layer fall off easily
[0005] Therefore, in the field of water treatment, the graphene airgel prepared by the prior art scheme still does not solve the problems of poor adsorption capacity and poor bioaffinity for heavy metals

Method used

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  • A kind of amidated graphene airgel and its preparation method and application
  • A kind of amidated graphene airgel and its preparation method and application
  • A kind of amidated graphene airgel and its preparation method and application

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preparation example Construction

[0052] First aspect, the present invention provides a kind of preparation method of amidated graphene airgel, such as figure 1 As shown, during specific implementation, the method may include the following steps:

[0053] Step 1 (S11), adding sodium hydroxide and monochloroacetic acid to the graphene oxide solution, performing an ultrasonic reaction, and centrifuging the first system after the reaction to obtain a primary product of carboxylated graphene.

[0054] During specific implementation, graphene oxide is dissolved in pure water, sodium hydroxide and monochloroacetic acid are added, stirred evenly, and ultrasonically reacted for 10 to 15 hours. After the reaction was completed, high-speed centrifugation was carried out to obtain a brown-black solid (i.e., the primary product of carboxylated graphene).

[0055] In this implementation step, optionally, the concentration of the graphene oxide solution obtained after graphene oxide is dissolved in pure water can be 1 to 5...

Embodiment 1

[0079] Embodiment 1: prepare amidated graphene airgel of the present invention

[0080] (1) Configure 200mL 9:1 sulfuric acid / phosphoric acid mixed solution in a beaker. Weigh 1.5g of graphite powder, pour it into the above mixed solution, and stir evenly. Cool the beaker containing the mixed solution in an ice-water bath and slowly add 9.0 g of potassium permanganate. At this time, ensure that the temperature of the mixed solution system does not exceed 20°C when adding potassium permanganate. After the potassium permanganate was added, the beaker containing the mixed solution was placed on a magnetic heating stirrer, the magnetic stirring speed was 300 rpm, and the temperature of the mixed solution in the beaker was kept at 50° C. for 12 hours. After the reaction was completed, the mixed solution was cooled to room temperature, and then the solution was mixed with 200 ml of ice and placed in an ice-water bath. Slowly drop 0.5% hydrogen peroxide solution into the mixed solu...

Embodiment 2

[0085] The preparation process of amidated graphene airgel is the same as that of Example 1.

[0086] Cu on the prepared amidated graphene airgel 2+ Heavy metal adsorption experiments. Configure 200mg / L Cu(NO) 2 Solution 50mL. A certain mass of amidated graphene airgel was weighed and added to the above solution, and the mixed system was shaken in a water bath shaker at 30°C. Take 2mL solution every 1 hour to measure the Cu in it 2+ concentration until Cu 2+ Concentration no longer changes. Finally, according to the equilibrium concentration, the amidated graphene airgel pair Cu 2+ the equilibrium adsorption capacity. Experimental results such as Figure 5 As shown, the adsorption of Cu 2 + In the case of the same initial Cu 2+ The equilibrium adsorption capacity of the amidated graphene aerogel at the concentration is about 85% higher than that of the traditional reduction method graphene aerogel.

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Abstract

The invention provides an amidated graphene airgel and a preparation method and application thereof. The preparation method comprises: firstly using ethanol as a cleaning agent to prepare carboxylated graphene with a smooth surface; and then preparing amidated graphene airgel with a smooth surface in an ethanol-water environment. Through this preparation method, an oxygen-containing group with both bioaffinity and metal ion adsorption capacity is introduced on the surface of the graphene sheet, so that while improving the metal ion adsorption capacity of the graphene airgel, it enhances the resistance to microorganisms. Adhesion ability; and, based on the smooth surface of the gel prepared in the ethanol environment, the sharp edges on the surface of the graphene airgel that are destructive to microbial cells are reduced, thereby improving the biocompatibility of the gel and facilitating the attachment of microorganisms. Therefore, the preparation method provided by the present invention has broad application scenarios in the field of sewage treatment.

Description

technical field [0001] The invention relates to the field of water treatment, and mainly relates to an amidated graphene airgel and a preparation method and application thereof. Background technique [0002] With the continuous development of social economy, the pollution of water environment has become increasingly prominent. Therefore, in the field of water environment treatment, the demand for functional materials is increasing, and researchers expect materials to have good pollutant adsorption and microbial affinity. Graphene airgel has the advantages of light weight, compressibility, and fire resistance. As a new adsorption material, it has become the first choice for those skilled in the art. [0003] However, the existing technical solutions for preparing graphene airgel, on the one hand, because the oxygen-containing groups in the material are removed during the preparation process, the functional materials prepared can only adsorb hydrophobic organic matter, and fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/28C01B32/184C02F1/28
CPCC01B32/184
Inventor 籍国东廖胤皓
Owner PEKING UNIV
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