Bifunctional graphene aerogel as well as preparation method and application thereof

A graphene airgel, dual-function technology, applied in the direction of airgel preparation, graphene, chemical instruments and methods, etc., can solve the problems of single function, narrow airgel application area, low material utilization rate, etc., to achieve Simple preparation process, excellent light and hot water evaporation performance and uranium adsorption performance, and strong adaptability to water environment

Active Publication Date: 2020-04-10
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current application of aerogels is still very narrow, limited to several fields such as heat insulation, and aerogels used in water environments are especially rare, and often have single functions, and the utilization rate of materials is low

Method used

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  • Bifunctional graphene aerogel as well as preparation method and application thereof
  • Bifunctional graphene aerogel as well as preparation method and application thereof
  • Bifunctional graphene aerogel as well as preparation method and application thereof

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preparation example Construction

[0049] Another aspect of the embodiments of the present invention also provides a method for preparing a bifunctional graphene airgel, which includes:

[0050] (1) Disperse graphene oxide and vegetable tannin in a solvent to obtain a uniform precursor dispersion;

[0051] (2) heating the precursor dispersion obtained in step (1) and standing to obtain a graphene wet gel;

[0052] (3) Drying the graphene wet gel obtained in step (2) to obtain a bifunctional graphene aerogel.

[0053] In some embodiments, in the step (1), the plant tannin includes any one of black wattle tannin, bayberry tannin, larch tannin, casuarina tannin, pachycarpa tannin, etc. Or a combination of two or more, but not limited thereto.

[0054] In some embodiments, the mass ratio of graphene oxide to vegetable tannin is 1:8-16:1, preferably 1:5-4:1.

[0055] Further, the solvent includes any one or a combination of two or more of water, methanol, ethanol, acetone, dimethyl sulfoxide, tetrahydrofuran, N,N...

Embodiment 1

[0071] (a) Disperse 30 mg graphene oxide and 120 mg black wattle tannin in 5 mL distilled water to obtain a uniform precursor dispersion.

[0072] (b) placing the homogeneous dispersion in step (a) in an environment of 80° C. for 6 hours to obtain a black graphene hydrogel.

[0073] (c) Place the black graphene hydrogel in step (b) in a supercritical drying kettle, 2 After supercritical drying for 12 hours, bifunctional graphene airgel was obtained.

[0074] The structure and performance characterization data of the bifunctional graphene airgel obtained in this embodiment are as follows: after BET test, the specific surface area of ​​the bifunctional graphene airgel is 260m 2 / g, the pore size distribution is 0.5-50nm, and its SEM structure is as figure 1 , its nitrogen adsorption-desorption curve and pore size distribution are as follows Figure 10 , its compressive stress-strain curve is as Figure 11 , and its water absorption curve is as Figure 12 , its light and hot...

Embodiment 2

[0076] (a) Disperse 10 mg of graphene oxide and 80 mg of myricetin in 5 mL of dimethyl sulfoxide to obtain a uniform precursor dispersion.

[0077] (b) The uniform dispersion in step (a) was placed in a water bath environment at 60° C. for 24 hours to obtain a black graphene hydrogel.

[0078] (c) The black graphene hydrogel in step (b) is placed in a freeze dryer, and freeze-dried at -40° C. for 24 hours to obtain a bifunctional graphene aerogel.

[0079] The scanning electron micrograph of the obtained bifunctional graphene airgel of the present embodiment is as follows figure 2 The relevant physical parameters are shown in Table 1.

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Abstract

The invention discloses a difunctional graphene aerogel as well as a preparation method and application thereof. The difunctional graphene aerogel has a continuous three-dimensional porous network structure, the three-dimensional porous network structure is formed by overlapping graphene sheet layers modified by vegetable tannin, and the vegetable tannin is uniformly attached to the graphene sheetlayers. The preparation method comprises the following steps: dispersing graphene oxide and the vegetable tannin in a solvent to obtain a uniform precursor dispersion liquid, heating and standing toobtain a graphene wet gel, and drying to obtain the difunctional graphene aerogel. The difunctional graphene aerogel has good mechanical strength, excellent hydrophilicity and water absorbability, excellent photo-thermal water evaporation performance and uranium adsorption performance, photo-thermal water evaporation and uranium extraction can be achieved at the same time, the preparation processis simple, reaction conditions are mild, operation is easy, the cost is low, environmental friendliness and no pollution are achieved, and continuous production can be achieved.

Description

technical field [0001] The invention relates to a preparation method of graphene aerogel, in particular to a graphene aerogel with dual functions of light and hot water evaporation and uranium extraction, its preparation method and application, and belongs to the field of nano energy technology. Background technique [0002] Airgel is a low-density solid material with a continuous three-dimensional porous network structure in which the dispersion medium is gas. Since 1932, American chemist Samuel Stephens Kistler first used supercritical fluid drying technology to prepare "solid smoke" - silica aerogel, aerogel as a new member of the material family has attracted people's attention and research. With the development of nearly a century, a series of aerogels with different materials, structures and properties have been synthesized one after another, such as silica aerogels derived from various alkoxysilanes, metal oxide aerogels (TiO 2 , Al 2 o 3 , ZrO 2 etc.), metal airg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194B01J13/00C02F1/04C02F1/28C02F101/20C02F103/08
CPCC01B32/184C01B32/194B01J13/0091C02F1/043C02F1/283C02F2103/08C02F2101/20C01B2204/32C01B2204/24Y02A20/124Y02A20/142Y02A20/212
Inventor 张学同吴芳武
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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