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Preparation method of graphene aerogel

A graphene aerogel, graphene technology, applied in the direction of graphene, chemical instruments and methods, general water supply saving, etc., can solve the problem that the graphene aerogel cannot be lightweight and high elasticity, and the photothermal conversion efficiency cannot be fully improved. , graphene foam properties are not easy to control and other problems, to achieve the effect of easy mass production, improve water evaporation efficiency, and improve photothermal properties

Inactive Publication Date: 2019-02-15
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, in this prior art, the direct freeze-drying method after solvent mixing will inevitably cause the stacking of graphene oxide, and the prepared large-area graphene sponge has low porosity and cannot achieve the light weight and high elasticity of graphene airgel. , the unique property of aperture connectivity
In addition, the properties of graphene foam are not easy to control and cannot fully improve the light-to-heat conversion efficiency.

Method used

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  • Preparation method of graphene aerogel
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preparation example Construction

[0026] A kind of preparation method of the graphene airgel that is used for seawater desalination or waste water treatment, adopts following steps:

[0027] 1. The sample obtained by spraying the pre-reduced graphene oxide sol with a concentration of 5-50mg / ml, and a reducing agent and / or hydrophilic material can also be added to the pre-reduced graphene oxide sol. Reducing agents that can be used include but are not limited to NaBH 4 , ascorbic acid, ethylenediamine or hydrazine hydrate, the mass ratio of reducing agent to graphene oxide is 0.01-20, the hydrophilic material used is sodium alginate, the mass ratio of hydrophilic material and graphene The ratio is 1:1 to 1:10, and the hydrophilic and hydrophobic properties of graphene airgel are adjusted by compounding hydrophilic materials. When spraying pre-reduced graphene oxide sol, it is necessary to control the nozzle diameter of the spray gun to 1.3-1.8mm, and the spraying distance to be 10-20cm , the ejection volume is...

Embodiment 1

[0032]A graphene oxide sol with a concentration of 15 mg / ml was prepared and ultrasonicated for 2 hours. Take 50ml graphene oxide and add 0.5gNaBH 4 and 0.25g sodium alginate and stir well, put it into the spray gun tank and spray. The nozzle diameter is 1.3mm, the spray distance is 10cm, and the spray volume is 100ml / min. Spraying time is 2 minutes. After the sample was freeze-dried for 48 hours, it was placed in a tube furnace for thermal reduction treatment, protected by Ar gas, the heating rate was 10°C / min, the temperature was raised to 800°C and kept for 1 hour, and naturally cooled to room temperature to obtain graphene airgel . Immerse the obtained graphene airgel in the nano-gold aqueous solution for 30 minutes, take it out and dry it in the air. figure 1 The physical picture and SEM picture of the prepared graphene airgel are shown in a and b, respectively. As shown in the figure, the large-scale graphene airgel prepared by this method has a diameter of about 13...

Embodiment 2

[0034] A graphene oxide sol with a concentration of 10 mg / ml was prepared and ultrasonicated for 3 hours. Take 50ml graphene oxide and add 0.75gNaBH 4 And stir well, put it into the spray gun tank for spraying. The nozzle diameter is 1.3mm, the spray distance is 10cm, and the spray volume is 100ml / min. Spray time 1 minute. After the sample was freeze-dried for 48 hours, it was placed in a tube furnace for thermal reduction treatment, protected by Ar gas, the heating rate was 10°C / min, the temperature was raised to 500°C and kept for 2 hours, and naturally cooled to room temperature to obtain graphene airgel . Immerse the obtained graphene airgel in the nano-gold aqueous solution for 30 minutes, take it out and dry it in the air, and repeat 3 times.

[0035] The solar photothermal conversion water evaporation and seawater desalination performance of the large-area graphene airgel prepared by this method are as follows: figure 2 shown. Figure (a) shows that the light inte...

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Abstract

The invention relates to a preparation method of graphene aerogel. The preparation method comprises the following steps: performing freeze-drying and thermal reduction treatment on a sample obtained by spraying pre-reduction oxidization graphene sol to obtain a graphene aerogel thin film, and adding nano noble metals into the graphene aerogel thin film to prepare the graphene aerogel. Compared with the prior art, the preparation method disclosed by the invention has the advantages that the hydrophilcity and the hydrophobicity of the graphene aerogel are adjusted by compounding a hydrophilic material; the photo-thermal property of the material is further improved by adding the nano noble metals into the graphene aerogel thin film, so that the water evaporation efficiency of sea water or wastewater is promoted.

Description

technical field [0001] The invention relates to the fields of seawater desalination and wastewater treatment, in particular to a preparation method of graphene airgel used for seawater desalination or wastewater treatment. Background technique [0002] Graphene airgel refers to a three-dimensional porous network structure with graphene as the main body, sometimes also called 3D graphene, graphene sponge or graphene foam. It has the nano-characteristics of graphene and the macro-structure of airgel, and generally has the advantages of light porosity, good photothermal properties and mechanical properties. The unique structure of graphene airgel can not only make full use of the excellent physical and chemical properties of single-layer graphene, but also solve the problem of easy agglomeration between graphene sheets. Therefore, graphene aerogels have broad application prospects in supercapacitors, catalytic carriers, pollutant adsorption, seawater desalination and other fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194C02F1/14C02F103/08
CPCC01B32/184C01B32/194C02F1/043C02F1/14C02F2103/08C01P2004/03Y02A20/212
Inventor 胡晓斌刘琳
Owner SHANGHAI JIAO TONG UNIV
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