CN110127676B - Hydrophobic graphene oxide aerogel and production method thereof - Google Patents
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Abstract
The invention discloses a hydrophobic graphene oxide aerogel and a production method thereof. And annealing the graphene oxide aerogel at 450-1000 ℃ to obtain the hydrophobic graphene oxide aerogel.
Description
Technical Field
The invention relates to a hydrophobic graphene oxide aerogel and a production method thereof.
Background
The graphene material is a carbon material with a ultrathin sheet layer structure and good mechanical and thermal stability. The existing preparation method of graphene mainly comprises a mechanical stripping method, an epitaxial growth method, a chemical vapor deposition method and a graphene oxide reduction method. The graphene oxide reduction method based on chemical reaction realizes economic, rapid and large-scale preparation of graphene. And carrying out thermal reduction or chemical reduction self-assembly on the graphene oxide to form a three-dimensional net, and further drying to obtain the graphene oxide aerogel. The graphene oxide aerogel has the dual characteristics of graphene and aerogel, has high-efficiency adsorption performance and compression resilience on petroleum and organic solvents, and can realize repeated adsorption-desorption processes, so that continuous adsorption on the petroleum and the organic solvents is realized.
CN107311152A discloses a method for preparing graphene, which comprises exposing long-range ordered graphene oxide liquid crystal to a gas-phase cross-linking agent atmosphere, standing, and allowing the cross-linking agent to enter a graphene oxide liquid crystal system in a gas-phase diffusion manner, to obtain a graphene oxide aerogel with a liquid crystal schlieren texture. According to the method, the cross-linking agent is introduced to enhance the skeleton structure of the graphene oxide aerogel, so that the later-stage cleaning difficulty is increased, and the hydrophobicity of the graphene oxide aerogel is influenced. CN105384165B discloses a preparation method of spongy light graphene aerogel, which comprises adding a foaming agent into a graphene oxide colloidal solution for foaming, and then placing the foamed foam system into liquid nitrogen for quick-freezing and shaping to obtain spongy light graphene aerogel. CN106517160B discloses a preparation method of isotropic superelastic graphene aerogel, which comprises using graphene oxide as a raw material, using foam cells generated by stirring sodium dodecyl sulfate aqueous solution as a template to prepare a foam, then forming a three-dimensional network structure through a reducing agent reduction reaction, and finally obtaining the isotropic graphene aerogel through freezing strengthening and heating drying. The graphene aerogel obtained by the method has high resilience, but is not high in hydrophobicity.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for producing a hydrophobic graphene oxide aerogel, which can stably produce and prepare a super-hydrophobic graphene oxide aerogel.
Another object of the present invention is to provide a hydrophobic graphene oxide aerogel, which has high resilience and ultrahigh hydrophobicity.
On one hand, the invention provides a production method of a hydrophobic graphene oxide aerogel, which comprises the step of annealing the graphene oxide aerogel at 450-1000 ℃.
According to the production method of the present invention, preferably, the graphene oxide aerogel is prepared by the following steps:
(1) adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion;
(2) adding a reducing agent and a foaming agent into the graphene oxide aqueous dispersion, and stirring to obtain a foam;
(3) placing the foam at 60-100 ℃ for reduction reaction for 2-12 h, and then cooling to room temperature to obtain graphene oxide hydrogel;
(4) and (3) freezing the graphene oxide hydrogel at-45 to-10 ℃ for 2-24 hours, taking out, heating to room temperature, and drying at the normal pressure and the temperature of 30-85 ℃ to obtain the graphene oxide aerogel.
According to the production method of the present invention, in the step (1), preferably, the graphene oxide has a sheet diameter of 2 to 50 μm and a sheet thickness of 1 to 30 nm.
According to the production method of the present invention, preferably, in the step (1), the graphene oxide aqueous dispersion has a graphene oxide concentration of 3 to 7 mg/ml.
According to the production method of the present invention, in the step (1), the oxygen-carbon molar ratio in the graphene oxide is preferably 0.15 to 0.65.
According to the production method provided by the invention, in the step (2), the mass ratio of the graphene oxide to the reducing agent is preferably 1: 2-5.
According to the production method of the present invention, preferably, in the step (2), the reducing agent is one or more selected from ascorbic acid, ethylenediamine, sodium tetraborate, a compound mixture of oxalic acid and potassium iodide, and hydroiodic acid; the foaming agent is selected from sodium dodecyl benzene sulfonate aqueous solution with the concentration of 20-80 mg/ml.
According to the production method of the invention, in the step (2), preferably, the stirring speed is 10000-50000 rpm, and the stirring time is 1-10 min.
According to the production method of the present invention, preferably, in step (4), the graphene oxide hydrogel is soaked and washed with an ethanol aqueous solution having an ethanol content of 1 to 10 vol% for 12 to 48 hours before the freezing treatment.
In another aspect, the present invention provides a hydrophobic graphene oxide aerogel obtained by the above production method.
According to the invention, through high-temperature annealing treatment, hydrophilic groups introduced in the preparation process are eliminated, and the hydrophobic property of the modified graphene is improved. The hydrophobic graphene oxide aerogel disclosed by the invention has a huge application prospect in the fields of adsorption treatment of petroleum, organic solvents and the like in sewage. Compared with graphene aerogel prepared without foaming, the graphene oxide aerogel prepared by foaming has the advantages that the air holes are isotropic, so that graphene has the same compression resilience in all directions.
Drawings
Fig. 1 is a photograph of a sample of the hydrophobic graphene oxide aerogel of example 2 deformed by about 50% by applying a certain pressure.
Fig. 2 is a photograph of the recovery of deformation of the hydrophobic graphene oxide aerogel of example 2 after the pressure is removed.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
The production method of the hydrophobic graphene oxide aerogel comprises a preparation step and an annealing treatment step of the graphene oxide aerogel. As described in detail below.
< annealing step >
Annealing is a heat treatment process in which a material is slowly heated to a certain temperature, held for a certain time, and then cooled at a certain speed. There is no report of applying the high temperature annealing treatment to the production of graphene aerogel.
The preparation method of the hydrophobic graphene oxide aerogel comprises the step of annealing the graphene oxide aerogel at 450-1000 ℃. Through high-temperature annealing treatment, the graphene oxide aerogel generates special molecular arrangement, and hydrophilic groups in the graphene oxide aerogel are eliminated, so that the hydrophobicity of the graphene oxide aerogel is increased. Preferably, the annealing treatment is performed at 500 to 1000 ℃. More preferably, the annealing treatment is performed at 600 to 800 ℃.
According to some embodiments of the invention, the heating is carried out at a heating rate of 10-20 ℃/min to 450-1000 ℃ for 0.5-5 h; and then cooling at a cooling rate of 10-20 ℃/min. Preferably, the heating rate is 12-18 ℃/min to 450-1000 ℃, the temperature is kept for 1-3 h, and then the temperature is reduced at the cooling rate of 12-18 ℃/min. More preferably, the mixture is heated to 450-1000 ℃ at a heating rate of 13-15 ℃/min, kept for 1-2 h, and then cooled at a cooling rate of 13-15 ℃/min. By adopting the annealing treatment process, the hydrophobicity of the graphene oxide aerogel can be greatly improved, and the adsorption performance and resilience of the graphene oxide aerogel are not influenced.
The production method is mainly suitable for the graphene oxide aerogel prepared by a chemical reduction process, and a reducing agent, a cross-linking agent, a surfactant, a foaming agent and the like are often required to be introduced in the preparation process, so that the prepared graphene oxide aerogel contains a plurality of hydrophilic groups, and the hydrophobic property of the graphene oxide aerogel is reduced by the hydrophilic groups. The production method can eliminate the introduced hydrophilic groups through chemical reaction, and can rearrange the graphene oxide aerogel molecules to form a special molecular arrangement structure, thereby further improving the hydrophobic performance of the graphene oxide aerogel.
< preparation of graphene oxide aerogel >
The preparation of the graphene oxide aerogel comprises the following steps: (1) preparing a graphene oxide aqueous dispersion; (2) a step of preparing a foam; (3) preparing graphene oxide hydrogel; (4) and (5) drying under normal pressure.
In the step (1), graphene oxide is added into water for dispersion to obtain a graphene oxide aqueous dispersion. The graphene oxide of the present invention also includes graphite oxide. In order to disperse the graphene oxide more sufficiently in water, ultrasonic dispersion treatment may be used. The sheet diameter of the graphene oxide can be 2-50 mu m, and the thickness of the sheet layer can be 1-30 nm; preferably, the sheet diameter of the graphene oxide is 2-45 μm, and the thickness of the sheet layer is 1-20 nm; more preferably, the graphene oxide has a sheet diameter of 20 to 45 μm and a sheet thickness of 1 to 10 nm. By adopting the graphene oxide with the sheet diameter structure, the prepared graphene oxide aerogel has better rebound resilience and hydrophobicity. The graphene oxide concentration of the graphene oxide aqueous dispersion can be 3-7 mg/ml; preferably, the concentration of the graphene oxide is 4-7 mg/ml; more preferably, the concentration of the graphene oxide is 4-6 mg/ml. By adopting the graphene oxide aqueous dispersion liquid within the concentration range, the graphene oxide aerogel with better adsorption performance and rebound resilience can be formed, and the hydrophobic performance of the graphene oxide aerogel is further improved. The oxygen-carbon molar ratio in the graphene oxide is 0.15-0.65; preferably 0.20 to 0.50; more preferably 0.35 to 0.45. The purity of the graphene oxide is not less than 95%, and preferably, the purity is 95% -98%; more preferably, the purity is 95% to 98%. By adopting the graphene oxide, the adsorption performance and resilience performance of the graphene oxide aerogel can be oxidized.
The graphene oxide of the present invention may be prepared by using an improved Hummers method, but is not limited to the graphene oxide prepared by the improved Hummers method. Graphene oxide prepared by a liquid phase method, a mechanical method, an electrochemical oxidation method and the like can be used in the production method of the invention.
In the step (2), a reducing agent and a foaming agent are added into the graphene oxide aqueous dispersion, and the mixture is stirred to obtain a foam. The mass ratio of the graphene oxide to the reducing agent in the graphene oxide aqueous dispersion liquid can be 1: 2-5, preferably 1: 2-4, and more preferably 1: 3-4. The reducing agent is selected from one or more of ascorbic acid, ethylenediamine, sodium tetraborate, a compound mixture of oxalic acid and potassium iodide and hydroiodic acid; preferably, the reducing agent is selected from one or more of ascorbic acid, ethylenediamine, oxalic acid and potassium iodide; the reducing agent is one or two of ascorbic acid and ethylenediamine. The foaming agent is sodium dodecyl benzene sulfonate aqueous solution. The concentration of sodium dodecyl benzene sulfonate in the sodium dodecyl benzene sulfonate aqueous solution can be 20-80 mg/ml, preferably, the concentration of sodium dodecyl benzene sulfonate is 30-70 mg/ml, and more preferably, the concentration of sodium dodecyl benzene sulfonate is 40-60 mg/ml.
In the step (2), the stirring rate may be 5000 to 30000rpm, preferably 10000 to 20000rpm, more preferably 10000 to 15000 rpm. The stirring time can be 1-10 min, preferably 2-8 min, and more preferably 2-5 min. Adopt above-mentioned stirring condition, can better foam sooner, the foaming body hole of formation is more even to make the isotropic nature of oxidation graphite alkene aerogel, the resilience is higher.
According to one embodiment of the invention, one or two mixtures of ascorbic acid and ethylenediamine are added into graphene oxide aqueous dispersion with the concentration of 4-6 mg/ml, then sodium dodecyl benzene sulfonate aqueous solution with the concentration of 40-60 mg/ml is added, and the mixture is stirred for 2-5 min under the condition that the stirring speed is 10000-30000 rpm, so as to obtain the foam.
In the step (3), the foam is subjected to a reduction reaction and then cooled to room temperature, so as to obtain the graphene oxide hydrogel. The foam can be subjected to reduction reaction for 2-12 h at the temperature of 60-100 ℃; preferably, the reduction reaction is carried out for 4-10 h at the temperature of 70-90 ℃; more preferably, the reduction reaction is carried out for 6-8 h at 80-90 ℃. By adopting the reduction conditions, the graphene oxide hydrogel generated by reduction has higher hydrophobic property.
And (4) freezing the graphene oxide hydrogel, taking out the graphene oxide hydrogel, heating the graphene oxide hydrogel to room temperature, and drying the graphene oxide hydrogel at normal pressure to obtain the graphene oxide aerogel. The graphene oxide hydrogel can be frozen for 2-24 hours at-45 to-10 ℃; preferably, the mixture is frozen for 3 to 18 hours at the temperature of between 45 ℃ below zero and 20 ℃ below zero; more preferably, the mixture is frozen at-45 to-35 ℃ for 10 to 15 hours. By adopting the freezing treatment process, the graphene oxide hydrogel can be quickly frozen, the formed graphene oxide aerogel has higher adsorption performance and rebound resilience, and the hydrophobic performance of the graphene oxide aerogel is further improved. The normal pressure drying temperature of the invention can be 30-85 ℃; preferably, the drying temperature is 45-80 ℃; more preferably, the drying temperature is 50 to 75 ℃. By adopting the drying temperature, the drying speed is further accelerated on the premise of not influencing the physical and chemical properties of the generated graphene oxide aerogel.
According to an embodiment of the present invention, step (4) further includes a graphene oxide hydrogel soaking and washing step. And taking out the soaked and washed graphene oxide for freezing treatment. The soaking and washing steps of the invention comprise: and soaking and washing the graphene oxide hydrogel with an ethanol water solution, and then taking out and freezing. The concentration of the ethanol water solution is 1-10 vol%; preferably, the concentration of the ethanol water solution is 1-8 vol%; more preferably, the concentration of the ethanol aqueous solution is 1-6 vol%. The soaking time can be 12-48 h; preferably, the soaking time is 20-36 h; more preferably, the soaking time is 24-36 h.
< graphene oxide aerogel >
The graphene oxide aerogel of the invention is produced by the method, and details are not repeated here. The graphene oxide aerogel with the ultrahigh hydrophobic property is generated by the graphene oxide aerogel with the ultrahigh hydrophobic property through the generation method. The adsorption treatment has pertinence to petroleum, organic solvent and the like in the sewage, and the adsorption rate is high, so that the adsorption-desorption continuous treatment can be realized.
The raw materials used in the examples and comparative examples are described below:
and (3) graphene oxide: hummers method.
The test method is introduced below:
contact angle test: and (3) dropping deionized water on the surface of the sample by using a contact angle tester to form a drop of liquid, then photographing and imaging by using the tester, and directly measuring the contact angle by using a protractor.
And (3) testing the recovery capability: and (3) placing the sample under a certain pressure, pressing down to generate deformation, and then removing the deformation recovery capability of the pressure detection sample.
Example 1
(1) Adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion solution with the concentration of 4 mg/ml;
(2) taking 60ml of the graphene oxide aqueous dispersion, adding 480mg of ascorbic acid into the graphene oxide aqueous dispersion, performing ultrasonic dispersion for 10min, fully mixing, adding 3ml of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 50mg/ml, and stirring for 5min at the rotating speed of 10000rmp to obtain a foam;
(3) placing the foam at 80 ℃ for reduction reaction for 6h, and then naturally cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing graphene oxide hydrogel in 1 vol% ethanol water solution for 24h, taking out, freezing at-45 ℃ for 12h, taking out, heating to room temperature, and drying at normal pressure at 60 ℃ to obtain graphene oxide aerogel.
And (3) annealing the obtained graphene oxide aerogel at 500 ℃ to obtain a super-hydrophobic graphene aerogel sample. The annealing treatment specifically comprises the following steps: heating to 500 deg.C at a heating rate of 15 deg.C/min, maintaining for 1h, and cooling at a cooling rate of 15 deg.C/min.
Example 2
(1) Adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion solution with the concentration of 5 mg/ml;
(2) taking 60ml of the graphene oxide aqueous dispersion, adding 600mg of ascorbic acid into the graphene oxide aqueous dispersion, performing ultrasonic dispersion for 10min, fully mixing, adding 3ml of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 50mg/ml, stirring for 5min at the rotating speed of 10000rmp, and pouring into a mould with the thickness of 30 multiplied by 5cm for sealing to obtain a foam;
(3) placing the sealed foam body at 80 ℃ for reduction reaction for 10h, and then naturally cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing graphene oxide hydrogel in 1 vol% ethanol water solution for 24h, taking out, freezing at-45 ℃ for 12h, taking out, heating to room temperature, and drying at normal pressure at 60 ℃ to obtain graphene oxide aerogel.
And (3) annealing the obtained graphene oxide aerogel with the thickness of 30 multiplied by 5cm at 500 ℃ to obtain a super-hydrophobic graphene aerogel sample. The annealing treatment specifically comprises the following steps: heating to 500 deg.C at a heating rate of 15 deg.C/min, maintaining for 1h, and cooling at a cooling rate of 15 deg.C/min.
Example 3
(1) Adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion solution with the concentration of 5 mg/ml;
(2) taking 80ml of the graphene oxide aqueous dispersion, adding 600mg of ascorbic acid into the graphene oxide aqueous dispersion, performing ultrasonic dispersion for 10min, fully mixing, adding 4ml of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 50mg/ml, stirring for 5min at the rotating speed of 10000rmp, and pouring into a mould with the thickness of 30 multiplied by 5cm for sealing to obtain a foam;
(3) placing the foam at 80 ℃ for reduction reaction for 10h, and then naturally cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing graphene oxide hydrogel in 1 vol% ethanol water solution for 24h, taking out, freezing at-45 ℃ for 12h, taking out, heating to room temperature, and drying at normal pressure at 60 ℃ to obtain graphene oxide aerogel.
And (3) annealing the obtained graphene oxide aerogel at 500 ℃ to obtain a super-hydrophobic graphene aerogel sample. The annealing treatment specifically comprises the following steps: heating to 500 deg.C at a heating rate of 15 deg.C/min, maintaining for 1h, and cooling at a cooling rate of 15 deg.C/min.
Example 4
(1) Adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion solution with the concentration of 5 mg/ml;
(2) taking 8l of the graphene oxide aqueous dispersion, adding 60g of ascorbic acid into the graphene oxide aqueous dispersion, performing ultrasonic dispersion for 10min, fully mixing, adding 0.4l of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 50mg/ml, stirring for 5min at the rotating speed of 10000rmp, and pouring into a mould with the thickness of 30 multiplied by 5cm for sealing to obtain a foam;
(3) placing the foam at 80 ℃ for reduction reaction for 10h, and then naturally cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing graphene oxide hydrogel in 1 vol% ethanol water solution for 24h, taking out, freezing at-45 ℃ for 12h, taking out, heating to room temperature, and drying at normal pressure at 60 ℃ to obtain graphene oxide aerogel.
And (3) annealing the obtained graphene oxide aerogel at 500 ℃ to obtain a super-hydrophobic graphene aerogel sample. The annealing treatment specifically comprises the following steps: heating to 500 deg.C at a heating rate of 15 deg.C/min, maintaining for 1h, and cooling at a cooling rate of 15 deg.C/min.
Example 5
(1) Adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion solution with the concentration of 5 mg/ml;
(2) taking 6l of the graphene oxide aqueous dispersion, adding 60mg of ascorbic acid into the graphene oxide aqueous dispersion, performing ultrasonic dispersion for 10min, fully mixing, adding 0.3l of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 50mg/ml, stirring for 5min at the rotating speed of 10000rmp, and pouring into a mould with the thickness of 30 multiplied by 5cm for sealing to obtain a foam;
(3) placing the foam at 80 ℃ for reduction reaction for 10h, and then naturally cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing graphene oxide hydrogel in 1 vol% ethanol water solution for 24h, taking out, freezing at-45 ℃ for 12h, taking out, heating to room temperature, and drying at normal pressure at 60 ℃ to obtain graphene oxide aerogel.
And (3) annealing the obtained graphene oxide aerogel at 500 ℃ to obtain a super-hydrophobic graphene aerogel sample. The annealing treatment specifically comprises the following steps: heating to 500 deg.C at a heating rate of 15 deg.C/min, maintaining for 1h, and cooling at a cooling rate of 15 deg.C/min.
Comparative example 1
(1) Adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion solution with the concentration of 5 mg/ml;
(2) taking 60ml of the graphene oxide aqueous dispersion, adding 600mg of ascorbic acid into the graphene oxide aqueous dispersion, performing ultrasonic dispersion for 10min, fully mixing, adding 3ml of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 50mg/ml, and stirring for 5min at the rotating speed of 10000rmp to obtain a foam;
(3) placing the foam at 80 ℃ for reduction reaction for 10h, and then naturally cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing the graphene oxide hydrogel for 24h by using 1 vol% ethanol water solution, taking out, freezing at-45 ℃ for 12h, taking out, heating to room temperature, and drying at normal pressure at 60 ℃ to obtain a graphene oxide aerogel sample.
Fig. 1 is a photograph showing about 50% of deformation after a certain pressure is applied to a sample prepared in example 2, and fig. 2 is a photograph showing recovery of deformation after the pressure is removed. As can be seen from comparison between fig. 1 and fig. 2, the sample prepared in example 2 is deformed by about 50% under a certain pressure, and can be almost restored to its original form after the pressure is removed, and has high resilience.
Contact angle measurements were made on the samples prepared in examples 1-5 and comparative example 1, and the results are shown in the following table. The results show that the contact angles of the comparative example samples without annealing treatment are much smaller than those of examples 1-5, indicating that the annealing treatment improves the hydrophobic properties of the graphene oxide aerogel.
TABLE 1
| Test sample | Contact angle (°) |
| Example 1 | 152 |
| Example 2 | 153 |
| Example 3 | 155 |
| Example 4 | 154 |
| Example 5 | 153 |
| Comparative example 1 | 138 |
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (4)
1. The production method of the hydrophobic graphene oxide aerogel is characterized by comprising the step of annealing the graphene oxide aerogel at 450-500 ℃;
the annealing treatment comprises the following steps: heating the graphene oxide aerogel to 450-500 ℃ at a heating rate of 12-18 ℃/min, and keeping for 1-3 h; cooling at a cooling rate of 12-18 ℃/min to obtain hydrophobic graphene oxide aerogel;
the graphene oxide aerogel is prepared by the following steps:
(1) adding graphene oxide into water for dispersion to obtain a graphene oxide aqueous dispersion; wherein the sheet diameter of the graphene oxide is 2-50 μm, and the thickness of the sheet layer is 1-30 nm; the oxygen-carbon molar ratio in the graphene oxide is 0.15-0.65;
(2) adding a reducing agent and a foaming agent into the graphene oxide aqueous dispersion, and stirring to obtain a foam; the reducing agent is selected from one or two mixtures of ascorbic acid and ethylenediamine; the foaming agent is selected from sodium dodecyl benzene sulfonate aqueous solution with the concentration of 20-80 mg/ml;
(3) placing the foam at 60-100 ℃ for reduction reaction for 2-12 h, and then cooling to room temperature to obtain graphene oxide hydrogel;
(4) soaking and washing graphene oxide hydrogel for 12-48 h by using ethanol water solution with the ethanol content of 1-10 vol%; and then placing the graphene oxide hydrogel at-45 to-10 ℃ for freezing treatment for 2-24 h, taking out, heating to room temperature, and drying at 30-85 ℃ under normal pressure to obtain the graphene oxide aerogel.
2. The production method according to claim 1, wherein in the step (1), the graphene oxide aqueous dispersion has a graphene oxide concentration of 3 to 7 mg/ml.
3. The production method according to claim 1, wherein in the step (2), the mass ratio of the graphene oxide to the reducing agent is 1: 2-5.
4. The production method according to claim 1, wherein in the step (2), the stirring rate is 10000 to 50000rpm, and the stirring time is 1 to 10 min.
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