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Graphene aerogel composite material capable of being magnetically driven as well as preparation method and application of graphene aerogel composite material

A technology of graphene airgel and composite materials, which is applied in the field of graphene airgel composite materials and its preparation, can solve the problems of non-environmental protection of photocatalysts, difficulties in recycling inorganic powder materials, self-aggregation, etc., and achieve improved photocatalytic performance. The effect of activity, uniform thickness and size, and good dispersion

Pending Publication Date: 2022-07-12
XUCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the research and development of inorganic nanopowders is under high temperature and pressure or using toxic or corrosive solvents, and most of the follow-up airgel research and development work also uses toxic or corrosive cross-linking agents, which leads to environmental problems in the preparation of photocatalysts. technical issues
[0005] On the other hand, the inorganic powder materials used as semiconductor photocatalysts have serious self-aggregation problems due to their large specific surface area and more exposed active sites, and the recycling of inorganic powder materials is difficult. inevitably limit its further application

Method used

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  • Graphene aerogel composite material capable of being magnetically driven as well as preparation method and application of graphene aerogel composite material
  • Graphene aerogel composite material capable of being magnetically driven as well as preparation method and application of graphene aerogel composite material
  • Graphene aerogel composite material capable of being magnetically driven as well as preparation method and application of graphene aerogel composite material

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preparation example Construction

[0034] The invention provides a preparation method of a magnetically driven graphene aerogel composite material, comprising the following steps:

[0035] (1) Fe 3 O 4 Nanoparticles, bismuth salt, citric acid and deionized water are mixed to obtain a mixed slurry;

[0036] (2) adding cetyltrimethylammonium bromide solution dropwise to the mixed slurry obtained in the step (1), and stirring to obtain a precursor;

[0037] (3) drying the precursor obtained in the step (2) to obtain Fe 3 O 4 / BiOBr;

[0038] (4) the Fe that described step (3) obtains 3 O 4 / BiOBr was mixed with lysine, graphene oxide, and deionized water for a hydrothermal reaction, resulting in a magnetically actuated graphene aerogel composite.

[0039] In the present invention, unless otherwise specified, the reagents used in the present invention can be commercially available products well known to those skilled in the art.

[0040] The present invention will Fe 3 O 4 Nanoparticles, bismuth salt, cit...

Embodiment 1

[0090] A preparation method of a magnetically driven graphene aerogel composite material, the steps are:

[0091] (1) Fe 3 O 4 The preparation method of nanoparticles is as follows: 0.81g FeCl 2 ·4H 2 O, 2.0g FeCl 3 ·6H 2 O was mixed with 110 mL of deionized water to obtain a transparent orange solution, wherein the ratio of the amount of divalent iron salt to trivalent iron salt iron salt was 0.86:1; after heating the transparent orange solution to 90 °C, To the transparent orange solution, add 1 mL of ammonia water with a concentration of 28-30% ammonia every 1 min, add dropwise 6 times, carry out a metathesis reaction, and obtain a precursor; the obtained precursor is allowed to stand at 90 ° C for 1 h. Aging; after the aging, the product was centrifuged, magnetically adsorbed, washed with deionized water for 3 to 5 times, and dried in vacuum at 60 ° C for 12 h to obtain Fe 3 O 4 nanoparticles.

[0092] (2) Fe prepared in step (1) 3 O 4 0.25 g of nanoparticles wer...

Embodiment 2

[0098] A preparation method of a magnetically driven graphene aerogel composite material, the steps are:

[0099] Fe is prepared by the methods of steps (1) to (4) of Example 1 3 O 4 / BiOBr.

[0100] The Fe obtained by 0.35g described step (3) 3 O 4 / BiOBr was mixed with 200mg lysine, 30mg graphene oxide and 6mL deionized water under ultrasonic, and reacted at 160 °C for 10h to conduct a hydrothermal reaction. After pre-cooling at ℃ for 1.5 h, and freeze-drying at -70 ℃ for 24 h, the magnetically actuated graphene aerogel composites were obtained; in which Fe 3 O 4 The mass ratio of / BiOBr, lysine and graphene oxide is 52.5:30:4.5.

[0101] The magnetically driven graphene aerogel composite material prepared in this example is abbreviated as Fe 3 O 4 / BiOBr / GE-2, Fe 3 O 4 The mass ratio of nanoparticles, BiOBr and graphene is preferably 160:190:3.

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Abstract

The invention provides a graphene aerogel composite material capable of being magnetically driven as well as a preparation method and application thereof, and belongs to the technical field of catalytic materials. According to the invention, cetyltrimethylammonium bromide is used as a cationic surfactant, and Br ions can be provided to interact with bismuth nitrate and citric acid to generate BiOBr; according to the preparation method disclosed by the invention, Fe3O4 / BiOBr is uniformly embedded between graphene sheet layers through a hydrothermal reaction, so that the photocatalytic activity of the composite material is ensured; fe3O4 is introduced, so that recovery of the composite material can be realized; the reagent adopted by the invention is green and environment-friendly, and the technical problem that the preparation of the photocatalyst is not environment-friendly can be solved. Data of embodiments show that the composite material prepared by the preparation method can degrade potassium dichromate to 99.8% within 30 min, and after catalytic degradation, the material can be directly recycled through a magnet.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a magnetically driven graphene aerogel composite material and a preparation method and application thereof. Background technique [0002] Among many semiconductor photocatalysts, single-component semiconductors usually undergo rapid recombination of hole / electron pairs after photoexcitation, resulting in low quantum efficiency. Therefore, practical photocatalytic degradation applications are greatly limited. For example, the bismuth-based semiconductor bismuth oxyhalide BiOX (X=Cl, Br or I) as an emerging photocatalytic material with narrow and tunable band gap (~2.3 eV or so), non-toxicity and high oxidizing ability, shows good photocatalytic potential. Nonetheless, like many semiconductors, the poor charge separation of the single component BiOX limits its photocatalytic activity. [0003] In recent years, tuning the semiconductor microstructure or loading carrier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128B01J37/10C02F1/30C02F101/20C02F101/30
CPCB01J27/128B01J37/10C02F1/30C02F2305/10C02F2101/20C02F2101/30B01J35/23B01J35/33B01J35/39Y02W10/37
Inventor 铁伟伟邱帅彪袁双义王红霞
Owner XUCHANG UNIV
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