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Preparation method and applications of graphene sheet vertically oriented thin film material

A vertically oriented, thin-film material technology, applied in graphene, chemical instruments and methods, general water supply conservation, etc., can solve problems such as structural damage, and achieve low cost, simple preparation methods, and environmental friendliness

Active Publication Date: 2017-07-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of these materials is easily damaged under the harsh conditions of concentrated acid, concentrated alkali or low temperature.

Method used

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  • Preparation method and applications of graphene sheet vertically oriented thin film material
  • Preparation method and applications of graphene sheet vertically oriented thin film material
  • Preparation method and applications of graphene sheet vertically oriented thin film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Prepare 7mg / mL graphene oxide solution by Hummers method;

[0051] 2. At a stirring rate of 3000r / min, add 100μL of ethanol to 3mL of graphene oxide solution, and continue stirring for 30min to obtain a uniformly mixed solution;

[0052] 3. Pour the uniformly mixed solution obtained in step 2 into a polytetrafluoroethylene container, and immediately place the bottom of the polytetrafluoroethylene container on the surface of liquid nitrogen for directional freezing from bottom to top to obtain graphene sheets vertically Hydrogels of oriented thin film materials;

[0053] 4. Freeze-dry the hydrogel of graphene sheet vertically oriented film material at -45°C for 72 hours to obtain the aerogel of graphene sheet vertically oriented film material;

[0054] 5. Under the protection of an argon atmosphere, anneal the graphene vertically oriented film material aerogel at 150°C for 3 hours, and then anneal at 1000°C for 2 hours to obtain a reduced graphene sheet vertically or...

Embodiment 2

[0057] 1. Prepare 5mg / mL graphene oxide solution by Hummers method;

[0058] 2. At a stirring rate of 3000r / min, add 30μL of ethanol to 3mL of graphene oxide solution, and continue stirring for 30min to obtain a uniformly mixed solution;

[0059] 3. Pour the uniformly mixed solution obtained in step 2 into a polytetrafluoroethylene container, and immediately place the bottom of the polytetrafluoroethylene container on the surface of liquid nitrogen for directional freezing from bottom to top to obtain graphene sheets vertically Hydrogels of oriented thin film materials;

[0060] 4. Freeze-dry the hydrogel of graphene sheet vertically oriented film material at -50°C for 60 hours to obtain the aerogel of graphene sheet vertically oriented film material;

[0061] 5. Under the protection of an argon atmosphere, anneal the graphene vertically oriented film material aerogel at 200°C for 1 hour, and then anneal at 800°C for 3 hours to obtain a reduced graphene sheet vertically orien...

Embodiment 3

[0064] 1. Prepare 7mg / mL graphene oxide solution by Hummers method;

[0065] 2. At a stirring rate of 3000r / min, add 60μL methanol to 3mL graphene oxide solution, and continue stirring for 30min to obtain a uniformly mixed solution;

[0066] 3. Pour the uniformly mixed solution obtained in step 2 into a polytetrafluoroethylene container, and immediately place the bottom of the polytetrafluoroethylene container on the surface of liquid nitrogen for directional freezing from bottom to top to obtain graphene sheets vertically Hydrogels of oriented thin film materials;

[0067] 4. Freeze-dry the hydrogel of graphene sheet vertically oriented film material at -55°C for 48 hours to obtain the aerogel of graphene sheet vertically oriented film material;

[0068] 5. Under the protection of an argon atmosphere, anneal the graphene vertically oriented film material aerogel at 200°C for 2 hours, and then anneal at 600°C for 4 hours to obtain a reduced graphene sheet vertically oriented ...

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Abstract

The invention relates to a preparation method and applications of a graphene sheet vertically oriented thin film material, and belongs to the field of functional materials. According to the preparation method, a graphene oxide solution obtained via pre-production is uniformly mixed with an antifreezing agent; an obtained mixture is delivered into a polytetrafluoroethylene container, and then the bottom of the polytetrafluoroethylene container is placed on the surface of liquid nitrogen immediately so as to realize orientation freezing from bottom to top and obtain a hydrogel of the graphene sheet vertically oriented thin film material; the hydrogel is subjected to freeze drying so as to obtain an aerogel of the graphene sheet vertically oriented thin film material; under argon protection, the aerogel is subjected to annealing so as to obtain the graphene sheet vertically oriented thin film material. The preparation method is simple; operation is convenient; the preparation method is suitable for large-scale production; the obtained graphene sheet vertically oriented thin film material possesses highly ordered channels beneficial for water molecule transmission and evaporation; and the graphene sheet vertically oriented thin film material can be used for realizing high efficiency solar energy seawater desalination, and water cleaning of concentrated acid, concentrated alkaline, and heavy metal solution.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene sheet vertically oriented film material, belonging to the field of functional materials. Background technique [0002] With the development of industry, the surge of global population and the aggravation of water pollution have exacerbated the shortage of fresh water resources. Solar energy is favored by people because of its advantages such as cleanness, safety in use, abundant resources, low utilization cost, and not being restricted by geographical conditions. Therefore, the process of using solar photothermal effect to distill seawater to remove minerals to obtain fresh water is a very energy-saving and efficient method, and it is also a hot spot of current research work. Materials currently used for solar desalination include the deposition of nano-aluminum particles on porous alumina films, polypyrrole deposition on stainless steel mesh, gold nanoparticles on dust-free p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194C01B32/198C02F1/14C02F103/08
CPCC01P2004/03C02F1/043C02F1/14C02F2103/08Y02A20/124Y02A20/142Y02A20/212Y02P20/133
Inventor 曲良体张盼盼
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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