A kind of mxene and graphene oxide composite airgel and its preparation method and application

A graphene composite and aerogel technology, which is applied in the direction of airgel preparation, chemical instruments and methods, and separation methods, can solve problems such as insufficient comprehensive purification capacity, insufficient heat management methods, and low light-to-heat conversion efficiency. Excellent stability of physical and chemical properties, expansion of practical applications, and high-efficiency light-to-heat conversion effects

Active Publication Date: 2021-06-22
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current problems in this field are low photothermal conversion efficiency, insufficient heat management methods, insufficient comprehensive purification ability and poor mechanical properties, etc.

Method used

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  • A kind of mxene and graphene oxide composite airgel and its preparation method and application
  • A kind of mxene and graphene oxide composite airgel and its preparation method and application
  • A kind of mxene and graphene oxide composite airgel and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] The present invention provides a kind of preparation method of MXene and graphene oxide composite airgel, and specific operation steps are as follows:

[0049] (1) Synthesis of MXene aqueous dispersion and graphene oxide aqueous dispersion: MAX powder and graphite powder were chemically exfoliated to obtain 2 mg / mL MXene and graphene oxide aqueous dispersion, respectively.

[0050] (2) Preparation of MXene and graphene oxide mixed gel solution: mix and stir 10mL of MXene water dispersion solution, 30mL graphene oxide water dispersion solution and 10mL 2mg / mL sodium alginate water dispersion solution evenly to obtain a mixture gel solution.

[0051] (3) Uncrosslinked MXene and graphene oxide composite aerogel: place the mixed gel solution obtained in step (2) at -30°C for 12 hours to freeze until it forms a block, and then place it in a freeze dryer for freeze-drying 12h, the uncrosslinked MXene and graphene oxide composite airgel was obtained.

[0052] (4) Preparation...

Embodiment 2

[0054] According to the preparation steps and reaction process of Example 1, only the graphene oxide solution is removed, and the types and proportions of the remaining configuration materials remain unchanged, so that the final airgel based on a single MXene can be obtained.

Embodiment 3

[0056] According to the preparation steps and reaction process of Example 1, only the MXene solution is removed, and the types and proportions of the remaining configuration materials remain unchanged, and the final single graphene oxide-based airgel can be obtained.

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Abstract

The invention provides a preparation method of MXene and graphene oxide composite airgel, comprising the following steps: 1) peeling off MAX powder and graphite powder by chemical method to obtain MXene water dispersion solution and graphene oxide water dispersion solution respectively 2) stirring and mixing the MXene aqueous dispersion, graphene oxide aqueous dispersion and sodium alginate aqueous dispersion to obtain a mixed gel solution; 3) performing directional freeze-drying on the mixed gel solution to obtain Uncrosslinked MXene and graphene oxide composite airgel; 4) adding an ionic crosslinking agent to the uncrosslinked MXene and graphene oxide composite airgel for ion crosslinking, and then freeze-drying to obtain crosslinked Combined MXene and graphene oxide composite airgel. In addition, the MXene and graphene oxide composite airgel prepared by the above method and its application in the fields of solar steam generation, seawater desalination, sewage purification, oil-water separation, and sterilization are also provided.

Description

technical field [0001] The invention belongs to the technical field of photothermal conversion materials, in particular to a composite airgel of MXene and graphene oxide and its preparation method and application Background technique [0002] In recent years, with the energy crisis, environmental pollution, water shortage and other major problems need to be solved urgently. Solar energy has become a research hotspot in the field of renewable energy utilization due to its many advantages such as wide sources, sufficient reserves, and greenness and cleanliness. As we all know, 71% of the earth's area is covered by water, of which the total amount of seawater is 1338×1 billion cubic meters, accounting for about 96.5% of the total global water. In the remaining amount of water, surface water accounts for 1.78%, and groundwater accounts for 1.69%. The total amount of fresh water resources that humans can mainly use is about 3.5 billion cubic meters, accounting for only 2.53% of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J20/20B01J20/24B01J20/28C02F1/00C02F1/28C02F1/50C02F103/08B01D17/022
CPCB01D17/0202B01J13/0091B01J20/20B01J20/24B01J20/28047C02F1/00C02F1/283C02F1/286C02F1/50C02F2103/08
Inventor 王贤保明鑫梅涛李金华王建颖钱静雯
Owner HUBEI UNIV
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