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Preparation method for oxidized graphene-poly-dopamine composite aerogel

A technology of composite airgel and polydopamine, which is applied in the direction of chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal compounds, etc., can solve the problem of affecting the adsorption capacity of airgel materials and cannot be applied to the field of sewage treatment, Structural stability is difficult to guarantee and other problems, to achieve the effect of environmental friendliness, integrity and stability, and low cost

Inactive Publication Date: 2016-01-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high surface energy of graphene makes it easy to agglomerate in the process of preparing adsorption materials, and there are no functional groups on its surface, showing a certain degree of hydrophobicity, which greatly reduces its use efficiency; so at present, graphene or graphene oxide The preparation of airgel-based airgel usually requires the introduction of cross-linking agents to increase its structural stability, but the introduction of cross-linking agents affects the adsorption capacity of airgel materials to a certain extent, reduces the use efficiency of materials, and is invisible. It will increase the processing cost of the material; and if no cross-linking agent is introduced, its structural stability is difficult to guarantee in organic solvents or water environments, so it cannot be applied to the actual sewage treatment field

Method used

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  • Preparation method for oxidized graphene-poly-dopamine composite aerogel
  • Preparation method for oxidized graphene-poly-dopamine composite aerogel
  • Preparation method for oxidized graphene-poly-dopamine composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of graphene oxide / polydopamine composite airgel, the steps are as follows:

[0035] A. Dissolve 0.6g of dopamine powder in 10ml of distilled water, mix it with 50ml of graphene oxide aqueous solution whose concentration is 6mg / ml at room temperature, stir for 30min, and the stirring speed is 60r / min to obtain graphene oxide / dopamine mixed solution;

[0036] B. While stirring, add 3mL of tris buffer solution with a concentration of 0.1mol / L dropwise in the graphene oxide / dopamine mixed solution, continue stirring for 2h after the addition is completed, and the stirring speed is 60r / min; Then stand still for 24 hours to fully polymerize dopamine to obtain graphene oxide / polydopamine composite hydrogel;

[0037] C. After freezing the graphene oxide / polydopamine composite hydrogel at -20°C for 24h, freeze-drying at a pressure of 20Pa and -50°C for 48h, the graphene oxide / polydopamine composite airgel was obtained .

[0038] The graphene oxide in the gra...

Embodiment 2

[0042] A preparation method of graphene oxide / polydopamine composite airgel, the steps are as follows:

[0043] A. Dissolve 0.3g of dopamine powder in 10ml of distilled water, mix it with 50ml of graphene oxide aqueous solution whose concentration is 6mg / ml at room temperature, stir for 30min, and the stirring speed is 60r / min to obtain graphene oxide / dopamine mixed solution;

[0044] B. While stirring, add 9mL of tris buffer solution with a concentration of 0.1mol / L dropwise in the graphene oxide / dopamine mixed solution, continue stirring for 2h after the addition is completed, and the stirring speed is 60r / min; Then stand still for 24 hours to fully polymerize dopamine to obtain graphene oxide / polydopamine composite hydrogel;

[0045] C. After freezing the graphene oxide / polydopamine composite hydrogel at -20°C for 24 hours, freeze-drying at a pressure of 20Pa and -50°C for 48 hours, the graphene oxide / polydopamine composite airgel was obtained .

[0046] The graphene oxid...

Embodiment 3

[0048] A preparation method of graphene oxide / polydopamine composite airgel, the steps are as follows:

[0049] A. Dissolve 0.7g of dopamine powder in 18ml of distilled water, compound and mix with 60ml of graphene oxide aqueous solution whose concentration is 5mg / ml at room temperature, stir for 40min, and the stirring speed is 80r / min to obtain graphene oxide / dopamine mixed solution;

[0050] B. Add 6mL tris buffer solution with a concentration of 0.12mol / L to the graphene oxide / dopamine mixed solution dropwise while stirring, and continue stirring for 2.5h after the addition is completed, at a stirring speed of 80r / min ; Then let it stand for 30 hours to fully polymerize dopamine to obtain graphene oxide / polydopamine composite hydrogel;

[0051] C. After freezing the graphene oxide / polydopamine composite hydrogel at -10°C for 30h, freeze-drying at a pressure of 30Pa and -60°C for 50h, the graphene oxide / polydopamine composite airgel was obtained .

[0052] The graphene ox...

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Abstract

The invention provides a preparation method for oxidized graphene-poly-dopamine composite aerogel. The preparation method comprises the following steps that 1, 0.15-0.7 g of dopamine powder is dissolved in 10-18 ml of distilled water, the dopamine aqueous solutions are mixed with 50-60 ml of oxidized graphene aqueous solutions with the concentration of 5-6 mg / ml, and stirring is performed to obtain oxidized graphene-dopamine mixed solutions; 2, 3-9 ml of tris aminomethane buffer solutions with the concentration of 0.1-0.12 mol / L are dropwise added into the mixed solutions while stirring is performed, stirring is continuously performed for 2-2.5 h, and standing is performed to enable the dopamine to be fully polymerized to obtain oxidized graphene-poly-dopamine composite aquogel; 3, after being placed in an environment with the temperature ranging from minus 20 DEG C to minus 10 DEG C to be frozen for 24-30 h, the composite aquogel is processed through freeze drying, and then the oxidized graphene-poly-dopamine composite aerogel is obtained. The method is simple in technology, and the prepared composite aerogel has the advantages of being high in porosity, excellent in adsorptivity, high in strength and the like.

Description

technical field [0001] The invention relates to a preparation method of graphene oxide / polydopamine composite airgel, which belongs to the technical field of airgel preparation. Background technique [0002] At this stage, the continuous development of industry and technology inevitably brings a series of environmental problems, so the protection and treatment of environmental pollution has become one of the problems that cannot be ignored in today's society. Among them, water pollution has the most direct and serious impact on our daily life. The source of water pollution is mainly industrial wastewater, which contains a large amount of heavy metal ions, organic dye molecules, and organic solvents. Once these substances enter the human body, they will induce various diseases and seriously threaten people's health. In recent years, researchers have carried out in-depth research on the prevention and control of water pollution, and have dealt with water pollution problems th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/075C08L79/02C08K9/02C08K3/04C08G73/02B01J20/26B01J20/28B01J20/30
Inventor 王勇戴剑杨静晖黄婷张楠
Owner SOUTHWEST JIAOTONG UNIV
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