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Macro preparation method of macroscopic three-dimensional graphene aerogel adsorption material used for indoor air purification

A technology of graphene airgel and adsorption materials, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as easy layer accumulation, achieve excellent adsorption performance, easy control, and low cost

Inactive Publication Date: 2013-11-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on its unique two-dimensional single atomic layer structure, graphene has a super large theoretical specific surface area (2630m 2 g -1 ), is expected to be used as a high-performance adsorption material. However, the strong van der Waals force between graphene nanosheets and the hydrophobic nature of graphene make graphene sheets easy to stack. How to synthesize high-performance graphene-based adsorption materials is The key issue in the research of graphene-based adsorption materials, constructing graphene-based porous three-dimensional framework structure is a very effective method

Method used

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  • Macro preparation method of macroscopic three-dimensional graphene aerogel adsorption material used for indoor air purification
  • Macro preparation method of macroscopic three-dimensional graphene aerogel adsorption material used for indoor air purification
  • Macro preparation method of macroscopic three-dimensional graphene aerogel adsorption material used for indoor air purification

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Embodiment 1

[0021] Graphite oxide was prepared by the classic hummer method, 1 gram of graphite oxide was dissolved in 100mL water, ultrasonically treated for two hours, the obtained dispersion was centrifuged at 4000rpm for 30 minutes, and the above graphene oxide suspension was collected, passed through Dilute to obtain a graphene oxide suspension with a concentration of 2 mg / ml, take 20 ml of the graphene oxide suspension, and add polyethyleneimine to form a mixed solution. The concentration of polyethyleneimine in the mixed solution is 2.5×10 -5 M, react the above mixed solution at 90°C without stirring for 6 hours to obtain a graphene hydrogel, wash the obtained graphene hydrogel with deionized water first to remove residual impurities, and then The graphene airgel was obtained by freeze-drying at 45° C. and a pressure of 0.02 mbar for 72 hours. Photos of the resulting product are shown in figure 1 , figure 1 It is shown that the prepared product is a macroscopic monolithic graphe...

Embodiment 2

[0023] Graphite oxide was prepared by the classic hummer method, 1 gram of graphite oxide was dissolved in 100mL water, ultrasonically treated for two hours, the obtained dispersion was centrifuged at 4000rpm for 30 minutes, and the above graphene oxide suspension was collected, passed through Dilute to obtain a graphene oxide suspension with a concentration of 2 mg / ml. Get graphene oxide suspension 200ml, add polyethyleneimine to form mixed solution, the concentration of polyethyleneimine in the mixed solution is 2.5 * 10 -5 M, react the above mixed solution at 90°C without stirring for 6 hours to obtain a graphene hydrogel, wash the obtained graphene hydrogel with deionized water first to remove residual impurities, and then The graphene airgel was obtained by freeze-drying at 45° C. and a pressure of 0.02 mbar for 72 hours. Photos of the resulting product are shown in Figure 4 , Figure 4 It is shown that the prepared product is a macroscopic bulk graphene airgel. It s...

Embodiment 3

[0025] Graphite oxide was prepared by the classic hummer method, 1 gram of graphite oxide was dissolved in 100mL water, ultrasonically treated for two hours, the obtained dispersion was centrifuged at 4000rpm for 30 minutes, and the above graphene oxide suspension was collected, passed through Dilute to obtain a graphene oxide suspension with a concentration of 2mg / ml, take 20ml of the graphene oxide suspension, add polyethyleneimine, and the concentration of polyethyleneimine in the mixed solution is 2.5×10 -5 M, react the above mixed solution at 90°C without stirring for 30 minutes to obtain a graphene hydrogel, wash the obtained graphene hydrogel with deionized water to remove residual impurities, and then The graphene airgel was obtained by freeze-drying at 45° C. and a pressure of 0.02 mbar for 72 hours. The prepared product is a macroscopic monolithic graphene airgel. Scanning electron micrographs show that the overall morphology of the product is a three-dimensional ai...

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Abstract

Belonging to the technical field of indoor air purification, the invention discloses a macro preparation method of a macroscopic three-dimensional graphene aerogel adsorption material used for indoor air purification. The method provided in the invention uses polyethyleneimine and graphite oxide as raw materials, employs polyethyleneimine to guide assembling of grapheme, and adopts a freeze-drying technique to obtain the three-dimensional graphene aerogel, which is an adsorption material applicable to indoor air purification. The invention adopts a mild solution method, the synthesis method has the advantages of low cost, green environmental protection, simplicity and feasibility, easy control, macro preparation ability and the like, thus being suitable for industrial mass production. The prepared three-dimensional graphene aerogel shows excellent adsorption performance on toxic formaldehyde gas, can reach an adsorption capacity of 2.43mg / g, thus being a novel adsorption material applicable to the field of indoor air purification.

Description

technical field [0001] The invention relates to an adsorption material and a preparation method thereof which can be used in the field of air purification, in particular to a formaldehyde gas adsorption material and a macro preparation method thereof. Background technique [0002] Formaldehyde pollution is an important factor of indoor pollution. Formaldehyde is a kind of primary poison, and formaldehyde in the air can cause obvious irritation to eyes, nose, throat, skin, etc. Due to its advantages of high removal efficiency, strong enrichment function, and no secondary pollution, the adsorption method has become an effective method for treating low-concentration harmful gases in recent years. Among various adsorbent materials, carbon-based adsorbent material is the most widely used adsorbent material. [0003] Graphene is a kind of carbon atom with sp developed in recent years 2 A carbon-based nanomaterial with a two-dimensional periodic honeycomb lattice structure forme...

Claims

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Application Information

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IPC IPC(8): C01B31/04B01J20/20C01B32/192
Inventor 郭林梁君飞
Owner BEIHANG UNIV
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