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Preparation method for high adsorptivity three-dimensional self-assembly graphene

A high-adsorption, graphene technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of low adsorption capacity, long-term hydrothermal reaction, etc., achieve convenient operation, shorten hydrothermal reaction time, and simple and fast preparation method Effect

Inactive Publication Date: 2013-06-12
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is of great significance to study the potential application value of adsorbent graphene materials in environmental protection, but the graphene prepared by the existing technology has a low adsorption capacity for organic solutions. If a higher adsorption capacity is to be achieved , requiring a longer hydrothermal reaction

Method used

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  • Preparation method for high adsorptivity three-dimensional self-assembly graphene
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  • Preparation method for high adsorptivity three-dimensional self-assembly graphene

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Effect test

Embodiment 1

[0018] Using graphene oxide prepared by the improved Hummers method as a starting material, it was dialyzed in deionized water for 10 days to obtain a graphene oxide aqueous solution. A hydrochloric acid solution with a concentration of 0.6 mol / l was added dropwise to a graphene oxide aqueous solution with a concentration of 1.0 mg / ml until the pH of the solution was 2, and the hydrothermal reaction was carried out at 180 °C for 8 h to obtain a black powder, which was washed with deionized water After washing, the filtered product was freeze-dried for 8 h to obtain the reduced graphene powder.

[0019] The graphene obtained in this example did not form a three-dimensional self-assembled structure after the hydrothermal reaction. As shown in Figure 1, the product was a black powder, and the graphene sheets did not form a certain shape macroscopically.

Embodiment 2

[0021] Using graphene oxide prepared by the improved Hummers method as a starting material, it was dialyzed in deionized water for 10 days to obtain a graphene oxide aqueous solution. A hydrochloric acid solution with a concentration of 0.6 mol / l was added dropwise to a graphene oxide aqueous solution with a concentration of 1.6 mg / ml, adjusted to pH=2, and hydrothermally reacted at 180 °C for 8 h to obtain a cylindrical black hydrogel. After washing with deionized water, the filtered product was freeze-dried for 8 h to obtain the reduced cylindrical graphene.

[0022] Three-dimensional self-assembled graphene is prepared under this condition. After hydrothermal reaction and freeze-drying, the sample is cylindrical, as shown in Figure 2. The results of the scanning electron microscope show that the three-dimensional self-assembled graphene is a porous structure. The layer is relatively close, and the pore size is small (1~3 μm), as shown in Figure 3(a). And it has excellent a...

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Abstract

The invention discloses a preparation method for three-dimensional self-assembly graphene which is strong in absorbing oil organic solvents. According to the preparation method, the graphite is taken as raw material, oxidized graphene taken as an initiator is dialyzed in deionized water so as to obtain an oxidized graphene water solution, under acidic condition, hydrothermal process is carried out on the oxidized graphene water solution so as to obtain a three-dimensional self-assembly graphene hydrogel, and finally, the hydrogel is washed with the deionized water and then dried through freezing so as to obtain the high adsorptivity three-dimensional self-assembly graphene.

Description

technical field [0001] The invention relates to a method for preparing graphene with adsorption properties, in particular to a method for preparing three-dimensional self-assembled graphene with high adsorption performance for lipophilic organic solvents. Background technique [0002] Graphene three-dimensional self-assembly material integrates the unique physical and chemical properties of graphene and the special structural characteristics of three-dimensional self-assembly. It not only has the excellent electrical, thermal and mechanical properties of graphene, but also has the unique high porosity and low density of three-dimensional systems. , large specific surface area, high mechanical strength and fast electron transport due to three-dimensional structure. Three-dimensional self-assembled graphene expands the physical properties and application space of two-dimensional graphene, and lays a solid foundation for the application of graphene in the fields of flexibility,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 高辉周秀丽邵宇艾合买提·肉孜徐建巍
Owner LANZHOU UNIVERSITY
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