CN110194676A - A kind of onion carbon graphite alkene composite aerogel and its preparation and application - Google Patents
A kind of onion carbon graphite alkene composite aerogel and its preparation and application Download PDFInfo
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- CN110194676A CN110194676A CN201910581723.8A CN201910581723A CN110194676A CN 110194676 A CN110194676 A CN 110194676A CN 201910581723 A CN201910581723 A CN 201910581723A CN 110194676 A CN110194676 A CN 110194676A
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- graphite alkene
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- carbon graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0045—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by a process involving the formation of a sol or a gel, e.g. sol-gel or precipitation processes
Abstract
The invention discloses a kind of onion carbon graphite alkene composite aerogels and preparation method thereof, it is using graphene oxide as presoma, dispersion obtains dispersion liquid in deionized water, onion carbon is added to be uniformly dispersed, add reducing agent ammonium citrate, hydro-thermal reaction completion is self-assembly of onion carbon graphite alkene plural gel, and after being dialysed, being freeze-dried, the three-dimensional net structure onion carbon graphite alkene composite aerogel that onion carbon and graphene sheet layer support each other is prepared.The composite aerogel prepared in the process of the present invention not only has extremely-low density and good mechanical performance, also has low thermal conductivity and excellent flame-retardant and thermal-insulated performance, can be used as fire retardant application.
Description
Technical field
The invention belongs to nanocomposite preparation technical fields, are related to a kind of preparation method of composite aerogel, especially
It is to be related to a kind of preparation method of composite aerogel based on onion carbon and graphene.
Background technique
It is well known that flame-retardant and thermal-insulated material refers to the material that with heat-insulating property, can play shielding action to hot-fluid
Material or composite body.Flame-retardant and thermal-insulated material itself burns extremely difficult, can prevent the burning of other inflammable articles, leads to
Often with there is the features such as light, loose, porous, thermal coefficient is small, it can be used for effective heat-insulated and active heat removal, be widely used in taking
The fields such as dress, petroleum, chemical industry, metallurgy, shipbuilding, fire-fighting, national defence.
A variety of auxiliary agents (halogen or antimony etc.) will be generally added in flame-retardant and thermal-insulated material currently on the market, have to environment
There is certain pollution, and flame retardant effect is unsatisfactory.
Graphene has two dimension sp2Conjugated carbon atoms structure, since graphene has high specific surface area, outstanding fire-retardant
Characteristic, good mechanical property etc., it is considered to be construct one of most important selection of three-dimensional porous structure.
Currently, ultralight compressible graphene aerogel is as a kind of emerging highly effective flame-retardant heat-insulating heat-preserving material, gradually by
To the concern of people.Studies have shown that graphene aerogel and other materials progress is compound, it is to improve graphene aerogel synthesis
One important channel of performance.
CN 109824942A discloses a kind of hybrid inorganic-organic materials composite flame-retardant agent, by GO-PDA, C3N4-B-Si、
ODOPB is mixed to get.It disperses epoxy resin in dehydrated alcohol, the hybrid inorganic-organic materials composite flame-retardant agent is added
And polyphosphoric acid amine, composite flame-proof material can be prepared.The composite flame-retardant agent can improve the flame retardant property of epoxy resin,
But preparation process is many and diverse, high production cost.More importantly dispersion performance of the polyphosphoric acid amine in fire proofing is poor,
Reunion will certainly be generated, the mechanical strength of fire proofing is seriously affected.
(Ultralight, highly compressible and the fire-retardant graphene such as Wang
aerogel with self-adjustable electromagnetic wave absorption[J]. Carbon,
2018,139:1126-1135.) primary reconstruction and thermal anneal process are used, has successfully prepared that density is ultralight, anti-flammability
Good three-dimensional porous compressible (75%) graphene aerogel.But the intensity of the aeroge is lower, easy to crack, to cause to hinder
Fire the reduction of performance.
CN 108342004A discloses a kind of graphene fire retardant elastic composite material, by 0.5~10% graphene microchip, 20
~35% fire retardant, 10~30% thermoplastic elastomer (TPE)s, 30~60% solvents and 0.1~1.5% auxiliary agent are prepared.With the composite wood
The graphene fire retardant elastic composite membrane of material preparation has the characteristics such as fire-retardant, highly conductive, bent and high attachment, but its preparation cost
Height limits its application.
Summary of the invention
The object of the present invention is to provide a kind of onion carbon graphite alkene composite aerogels and preparation method thereof, with present invention side
The composite aerogel of method preparation not only has extremely-low density and good mechanical performance, also has low thermal conductivity and excellent resistance
Fire heat preservation and insulation.
The preparation method of onion carbon graphite alkene composite aerogel of the present invention is incited somebody to action using graphene oxide as presoma
It disperses to obtain dispersion liquid in deionized water, and onion carbon is added and is uniformly dispersed, adds reducing agent ammonium citrate, hydro-thermal reaction
Completion is self-assembly of onion carbon graphite alkene plural gel, and after being dialysed, being freeze-dried, onion carbon and graphene is prepared
The three-dimensional net structure onion carbon graphite alkene composite aerogel that lamella supports each other.
In the above-mentioned preparation method of the present invention, the dosage mass ratio of the graphene oxide and onion carbon is 1: (0.1~1).
In turn, the dosage of the reducing agent ammonium citrate is 0.1~10 times of graphene oxide quality.
In the above-mentioned preparation method of the present invention, it is preferred to use the graphene oxide is dispersed in deionization by ultrasound treatment patterns
Aqueous dispersions are formed in water.
Further, the present invention is that graphene oxide dispersion is preferably prepared concentration in deionized water as 2~5mg/mL
Graphene oxide aqueous dispersions.
In the above-mentioned preparation method of the present invention, the hydro-thermal reaction is carried out at 120~180 DEG C.
Preferably, the hydro-thermal reaction time is 3~12h.
The present invention carries out dialysis purified treatment to the onion carbon graphite alkene plural gel of above-mentioned formation, compound to remove
Remaining reducing agent and other by-products in gel.Specific method is to wash plural gel dehydrated alcohol and deionized water repeatedly
Wash, then be soaked in ethyl alcohol deionized water mixed solution and dialyse repeatedly, until mixed solution fade to it is colorless and transparent.
In the ethyl alcohol deionized water mixed solution, the volume ratio of ethyl alcohol and deionized water is 1: (10~20).
Further, dialysis time of the plural gel in mixed solution is preferably 24~72h.
Plural gel after dialysis is freeze-dried to finally obtain the compound airsetting of onion carbon graphite alkene by the present invention
Glue.The freeze-drying is specifically by the first 24~48h of pre-freeze at -78 DEG C of plural gel, then is placed in freeze drier, in temperature
It is freeze-dried under the conditions of -80 DEG C of degree, vacuum degree 8Pa, 24~48h of drying time.
For the onion carbon graphite alkene composite aerogel of above method preparation of the present invention as a kind of super light material, material is close
Degree is only 4.21~16.19mg/cm3。
External force is imposed to prepared onion carbon graphite alkene composite aerogel, its deformation quantity is made to respectively reach 60%,
90%, 95%, after removing external force, composite aerogel can restore to show excellent compression resilience to initial configuration.While with
External force makes its deformation quantity reach 50% in onion carbon graphite alkene composite aerogel, and 100 times repeatedly, composite aerogel
Size only have 4~7% decaying, show excellent cyclical stability.The mechanicalness of onion carbon graphite alkene composite aerogel
It can be good.
Onion carbon graphite alkene composite aerogel prepared by the present invention also has excellent flame-retardant and thermal-insulated performance, can be with
As fire retardant application.
The present invention uses hydrothermal reduction method that onion carbon graphite alkene composite aerogel, the compound airsetting has been prepared for the first time
Onion carbon and graphene nanometer sheet perfect combination in glue form uniformly complete oversized hole structure, prepared compound airsetting
Glue not only compound with regular structure, and resilience is good, and 95% can be up to compressive deformation and is sprung back, composite aerogel is greatly improved
Usable range and comfort property.
The present invention prepares the compound airsetting of onion carbon graphite alkene by easy hydrothermal reduction method, by freeze drying process
Glue, not only preparation process is simple, and controllability is strong, and low to production equipment requirement, is suitable for industrialization large-scale production.
Onion carbon graphite alkene composite aerogel prepared by the present invention is nontoxic, non-stimulated, will not be to its subsequent applications and performance
It impacts, stability and safety are good.
Detailed description of the invention
Fig. 1 is the SEM scanning electron microscope shape appearance figure that embodiment 1 prepares onion carbon graphite alkene composite aerogel.
Fig. 2 is the TEM scanning electron microscope shape appearance figure that embodiment 1 prepares onion carbon graphite alkene composite aerogel.
Fig. 3 is the X-ray diffraction intensity map that embodiment 1 prepares onion carbon graphite alkene composite aerogel.
Fig. 4 is the infrared spectrogram that embodiment 1 prepares onion carbon graphite alkene composite aerogel.
Fig. 5 is the mechanical compression test chart that embodiment 1 prepares onion carbon graphite alkene composite aerogel.
Fig. 6 is the flame retardant property test photo that embodiment 1 prepares onion carbon graphite alkene composite aerogel.
Specific embodiment
Following embodiments are only the preferred technical solution of the present invention, are not used to carry out any restrictions to the present invention.For
For those skilled in the art, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc., should all be included in the protection scope of the present invention.
Embodiment 1.
30mg graphene oxide is taken, is added in 10ml deionized water, with frequency 59KHz ultrasonic disperse in Ultrasound Instrument
20min obtains the graphene oxide dispersion that concentration is 3mg/mL.
5mL graphene oxide dispersion is taken, 7.5mg onion carbon is added with frequency 59KHz ultrasonic disperse 30min and obtains ocean
Green onion carbon/graphene oxide mixed dispersion liquid.
75mg reducing agent ammonium citrate is added into above-mentioned mixed dispersion liquid to obtain with frequency 59KHz ultrasonic disperse 10min
To reaction mixture.
The reaction mixture is placed in the reaction kettle with polytetrafluoroethyllining lining, seals, is placed in baking oven, is heated up
To 120 DEG C of hydro-thermal reaction 9h.
Stop heating after reaction, product is cooled to 25 DEG C, obtains onion carbon graphite alkene plural gel.
Onion carbon graphite alkene plural gel dehydrated alcohol obtained above and deionized water are respectively washed 5 times, are immersed in
In ethyl alcohol and the mixed solution of deionized water volume ratio 1: 20, dialyse 48h, displaces the liquid in plural gel.
Plural gel after dialysis is first placed in ultra-low temperature freezer, and -78 DEG C of pre-freezes for 24 hours, then are placed in the cold of vacuum degree 8Pa
In lyophilizer, -80 DEG C of freeze-drying 48h obtain final product onion carbon graphite alkene composite aerogel.
Fig. 1 show the SEM figure of above-mentioned preparation onion carbon graphite alkene composite aerogel.It can be seen from the figure that compound gas
Gel rubber material has the three-dimensional porous structure abundant being cross-linked with each other, and pore diameter range is from nanometer to micron-scale.In more high magnification numbe
Under further look at, graphene film layer surface becomes coarse, this is attributed to the introducing of onion carbon, and the two is combined closely, and is formed
Continuous face.Above structure can effectively improve the flame retardant property of aerogel composite.
Fig. 2 show the TEM figure of above-mentioned preparation onion carbon graphite alkene composite aerogel.It can be seen on the surface of graphene
Height fold or fold domain are observed, this potentially contributes to elevating mechanism performance.In addition, onion carbon also has good graphitization
Degree, according to the HRTEM image result on right side in figure, onion carbon thickness range can be observed obviously from 3~17 layers or so modulations
To the typical graphite characteristic with 0.34nm interfloor distance, this equally will increase the mechanical strength and flame retardant property of material.
Fig. 3 provides the X-ray diffraction intensity map of above-mentioned preparation onion carbon graphite alkene composite aerogel.Compound airsetting
Glue is moved to right compared with onion carbon and the corresponding diffraction maximum peak position of graphene aerogel (002), illustrates that degree of graphitization obtains
Enhancing, this is corresponding with TEM characterization result.At the same time, (101) corresponding diffraction peak intensity also has very compared with graphene aerogel
Big raising, it was demonstrated that the material has very good degree of graphitization, and then improves the comprehensive performance of material.
Fig. 4 is then the FTIR spectrum figure of above-mentioned preparation onion carbon graphite alkene composite aerogel.In figure, 3437cm-1
Place is the stretching vibration peak of-OH, 1737cm-1And 1640cm-1Place is-C=O and-C=C stretching vibration peak respectively, can therefrom be sent out
- C=C absorption peak of existing composite aerogel is better than graphene aerogel, mutually echoes with characterization result before.In addition, 1582cm-1Place
It is-NH2Stretching vibration peak, 1205cm-1Place is-CN stretching vibration peak.
Fig. 5 show the measuring mechanical property figure of onion carbon graphite alkene composite aerogel.Test result shows when its shape
When variable respectively reaches ε=60%, 90%, 95%, after removing external force, composite aerogel sample can restore to elemental height, performance
Excellent compression resilience out.
In turn, external force is removed in deformation quantity ε=50%, makes sample spontaneous recovery, recompression to deformation quantity ε=50%, so
100 times repeatedly, carry out compression rebound test.The results show that composite aerogel also only has 4% after the rebound of 100 second compressions
Altitude decay shows excellent cyclical stability.
Embodiment 2.
45mg graphene oxide is taken, is added in 15ml deionized water, with frequency 59KHz ultrasonic disperse in Ultrasound Instrument
20min obtains the graphene oxide dispersion of concentration 3mg/mL.
5mL graphene oxide dispersion is taken, 1.5mg onion carbon is added with frequency 59KHz ultrasonic disperse 30min and obtains ocean
Green onion carbon/graphene oxide mixed dispersion liquid.
135mg reducing agent ammonium citrate is added into above-mentioned mixed dispersion liquid, frequency 59KHz ultrasonic disperse 10min is obtained
Reaction mixture.
The reaction mixture is placed in the reaction kettle with polytetrafluoroethyllining lining, seals, is placed in baking oven, is heated up
To 150 DEG C of hydro-thermal reaction 6h.
Stop heating after reaction, product is cooled to 25 DEG C, obtains onion carbon graphite alkene plural gel.
After onion carbon graphite alkene plural gel obtained above is respectively washed 5 times with dehydrated alcohol and deionized water repeatedly,
It is immersed in ethyl alcohol and the mixed solution of deionized water volume ratio 1: 10, dialyse 36h, displaces the liquid in plural gel.
Plural gel after dialysis is first placed in ultra-low temperature freezer, and -78 DEG C of pre-freezes for 24 hours, then are placed in the cold of vacuum degree 8Pa
In lyophilizer, -80 DEG C of freeze-dryings for 24 hours, obtain final product onion carbon graphite alkene composite aerogel.
Embodiment 3.
60mg graphene oxide is taken, is added in 30ml deionized water, with frequency 59KHz ultrasonic disperse in Ultrasound Instrument
20min obtains the graphene oxide dispersion of concentration 2mg/mL.
5mL graphene oxide dispersion is taken, 10mg onion carbon is added with frequency 59KHz ultrasonic disperse 30min and obtains ocean
Green onion carbon/graphene oxide mixed dispersion liquid.
100mg reducing agent ammonium citrate is added into above-mentioned mixed dispersion liquid, frequency 59KHz ultrasonic disperse 10min is obtained
Reaction mixture.
The reaction mixture is placed in the reaction kettle with polytetrafluoroethyllining lining, seals, is placed in baking oven, is heated up
To 120 DEG C of hydro-thermal reaction 6h.
Stop heating after reaction, product is cooled to 25 DEG C, obtains onion carbon graphite alkene plural gel.
After onion carbon graphite alkene plural gel obtained above is respectively washed 5 times with dehydrated alcohol and deionized water repeatedly,
It is immersed in ethyl alcohol and the mixed solution of deionized water volume ratio 1: 15, dialysis for 24 hours, displaces the liquid in plural gel.
Plural gel after dialysis is first placed in ultra-low temperature freezer, -78 DEG C of pre-freeze 36h, then is placed in the cold of vacuum degree 8Pa
In lyophilizer, -80 DEG C of freeze-dryings for 24 hours, obtain final product onion carbon graphite alkene composite aerogel.
Embodiment 4.
45mg graphene oxide is taken, is added in 9ml deionized water, with frequency 59KHz ultrasonic disperse in Ultrasound Instrument
20min obtains the graphene oxide dispersion of concentration 5mg/mL.
5mL graphene oxide dispersion is taken, 7.5mg onion carbon is added with frequency 59KHz ultrasonic disperse 30min and obtains ocean
Green onion carbon/graphene oxide mixed dispersion liquid.
50mg reducing agent ammonium citrate is added into above-mentioned mixed dispersion liquid, frequency 59KHz ultrasonic disperse 10min is obtained
Reaction mixture.
The reaction mixture is placed in the reaction kettle with polytetrafluoroethyllining lining, seals, is placed in baking oven, is heated up
To 150 DEG C of hydro-thermal reaction 12h.
Stop heating after reaction, product is cooled to 25 DEG C, obtains onion carbon graphite alkene plural gel.
After onion carbon graphite alkene plural gel obtained above is respectively washed 5 times with dehydrated alcohol and deionized water repeatedly,
It is immersed in ethyl alcohol and the mixed solution of deionized water volume ratio 1: 20, dialyse 72h, displaces the liquid in plural gel.
Plural gel after dialysis is first placed in ultra-low temperature freezer, -78 DEG C of pre-freeze 36h, then is placed in the cold of vacuum degree 8Pa
In lyophilizer, -80 DEG C of freeze-drying 48h obtain final product onion carbon graphite alkene composite aerogel.
Embodiment 5.
40mg graphene oxide is taken, is added in 10ml deionized water, with frequency 59KHz ultrasonic disperse in Ultrasound Instrument
20min obtains the graphene oxide dispersion of concentration 4mg/mL.
5mL graphene oxide dispersion is taken, 18mg onion carbon is added with frequency 59KHz ultrasonic disperse 30min and obtains ocean
Green onion carbon/graphene oxide mixed dispersion liquid.
120mg reducing agent ammonium citrate is added into above-mentioned mixed dispersion liquid, frequency 59KHz ultrasonic disperse 10min is obtained
Reaction mixture.
The reaction mixture is placed in the reaction kettle with polytetrafluoroethyllining lining, seals, is placed in baking oven, is heated up
To 180 DEG C of hydro-thermal reaction 10h.
Stop heating after reaction, product is cooled to 25 DEG C, obtains onion carbon graphite alkene plural gel.
After onion carbon graphite alkene plural gel obtained above is respectively washed 5 times with dehydrated alcohol and deionized water repeatedly,
It is immersed in ethyl alcohol and the mixed solution of deionized water volume ratio 1: 15, dialyse 36h, displaces the liquid in plural gel.
Plural gel after dialysis is first placed in ultra-low temperature freezer, -78 DEG C of pre-freeze 48h, then is placed in the cold of vacuum degree 8Pa
In lyophilizer, -80 DEG C of freeze-drying 48h obtain final product onion carbon graphite alkene composite aerogel.
Comparative example 1.
30mg graphene oxide is taken, is added in 10ml deionized water, with frequency 59KHz ultrasonic disperse in Ultrasound Instrument
20min obtains the graphene oxide dispersion of concentration 3mg/mL.
5mL graphene oxide dispersion is taken, onion carbon is added without, is directly added into 75mg reducing agent ammonium citrate, frequency
59KHz ultrasonic disperse 10min, obtains reaction mixture.
The reaction mixture is placed in the reaction kettle with polytetrafluoroethyllining lining, seals, is placed in baking oven, is heated up
To 120 DEG C of hydro-thermal reaction 9h.
Stop heating after reaction, product is cooled to 25 DEG C, obtains Graphene gel.
After Graphene gel obtained above is respectively washed 5 times with dehydrated alcohol and deionized water repeatedly, it is immersed in ethyl alcohol
In the mixed solution of deionized water volume ratio 1: 20, dialyse 48h, displaces the liquid in gel.
Gel after dialysis is first placed in ultra-low temperature freezer, -78 DEG C of pre-freezes for 24 hours, then be placed in vacuum degree 8Pa freezing it is dry
In dry machine, -80 DEG C of freeze-drying 48h obtain final product graphene aerogel.
Fig. 6 gives the flame retardant property test photo that embodiment 1 prepares onion carbon graphite alkene composite aerogel.Taper amount
Hot instrument test result shows: passing through 10min constant ignition (irradiation intensity 35KW, 683 DEG C of temperature), composite aerogel can not be by point
Combustion, test front and back pattern is almost unchanged, shows excellent flame retardant property.And the preparation of test and comparison example 1 under similarity condition
Biggish damage can occur for graphene aerogel, the center of aeroge, with a small amount of flue gas, flame retardant property in test process
The substantially less than onion carbon graphite alkene composite aerogel of the preparation of embodiment 1.
Further the flame retardant property of onion carbon graphite alkene composite aerogel is tested, prepared by Example 1 and 2
Onion carbon graphite alkene composite aerogel is placed on alcolhol burner the 2min that burns together with graphene aerogel prepared by comparative example 1,
The mass change of detection burning front and back.
The result shows that only having 7% and 18.4% matter after Examples 1 and 2 preparation onion carbon graphite alkene composite aerogel burning
Amount loss, and the mass loss that comparative example 1 prepares graphene aerogel is up to 39.8%, it was demonstrated that the compound gas of onion carbon graphite alkene
The outstanding flame retardant property of gel.
Comparative example 2.
Onion carbon and reducing agent ammonium citrate are not added, remaining is carried out according to 1 method of embodiment, and prepared aeroge is being pressed
Non-reversible deformation can occur when contracting test.
Meanwhile at the end of anti-flammability is tested, aeroge is almost burnt out, and mass loss is up to 78.3%.
Comparative example 3.
Reducing agent ammonium citrate is not added, remaining is carried out according to 1 method of embodiment, and prepared aerogel block body is irregular,
Onion carbon poly combines in bottom, structural fragile, bad mechanical property.
Anti-flammability test is carried out to prepared aeroge, test result situation compared with comparative example 1 is slightly taken on a new look, but not yet
It achieves the desired purpose.
Claims (10)
1. a kind of preparation method of onion carbon graphite alkene composite aerogel, is dispersed in using graphene oxide as presoma
Dispersion liquid is obtained in deionized water, onion carbon is added and is uniformly dispersed, adds reducing agent ammonium citrate, and hydro-thermal reaction is completed from group
Dress forms onion carbon graphite alkene plural gel, and after being dialysed, being freeze-dried, onion carbon and graphene sheet layer is prepared each other
The three-dimensional net structure onion carbon graphite alkene composite aerogel of support.
2. the preparation method of onion carbon graphite alkene composite aerogel according to claim 1, it is characterized in that the oxidation stone
The dosage mass ratio of black alkene and onion carbon is 1: (0.1~1).
3. the preparation method of onion carbon graphite alkene composite aerogel according to claim 1, it is characterized in that the reducing agent
The dosage of ammonium citrate is 0.1~10 times of graphene oxide quality.
4. the preparation method of onion carbon graphite alkene composite aerogel according to claim 1, it is characterized in that at using ultrasound
Reason mode disperses the graphene oxide to form the graphene oxide water dispersion that concentration is 2~5mg/mL in deionized water
Liquid.
5. the preparation method of onion carbon graphite alkene composite aerogel according to claim 1, it is characterized in that the hydro-thermal is anti-
It should be carried out at 120~180 DEG C, 3~12h of the hydro-thermal reaction time.
6. the preparation method of onion carbon graphite alkene composite aerogel according to claim 1, it is characterized in that the onion
The dialysis treatment of carbon graphite alkene plural gel is to wash plural gel dehydrated alcohol and deionized water repeatedly, then soak
Steep and dialyse repeatedly in ethyl alcohol deionized water mixed solution, until mixed solution fade to it is colorless and transparent.
7. the preparation method of onion carbon graphite alkene composite aerogel according to claim 6, it is characterized in that the ethyl alcohol is gone
In ion water mixed solution, the volume ratio of ethyl alcohol and deionized water is 1: (10~20).
8. the preparation method of onion carbon graphite alkene composite aerogel according to claim 1, it is characterized in that the onion
The freeze-drying of carbon graphite alkene plural gel is that the first 24~48h of pre-freeze at -78 DEG C of plural gel then is placed in freeze-drying
In machine, 24~48h is freeze-dried under the conditions of -80 DEG C of temperature, vacuum degree 8Pa.
9. the onion carbon graphite alkene composite aerogel that any preparation method of claim 1~8 is prepared.
10. application of the onion carbon graphite alkene composite aerogel as fire retardant described in claim 9.
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| CN113659142A (en) * | 2021-08-06 | 2021-11-16 | 欣旺达电动汽车电池有限公司 | Nitrogen-doped graphene aerogel and preparation method thereof, lithium-sulfur battery positive electrode material and preparation method thereof, and lithium-sulfur battery |
| CN114058075A (en) * | 2021-10-13 | 2022-02-18 | 河北大学 | Reed-based flame retardant and flame-retardant epoxy resin |
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