CN107652946A - A kind of preparation method and applications of light porous absorbing material - Google Patents
A kind of preparation method and applications of light porous absorbing material Download PDFInfo
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- CN107652946A CN107652946A CN201710732684.8A CN201710732684A CN107652946A CN 107652946 A CN107652946 A CN 107652946A CN 201710732684 A CN201710732684 A CN 201710732684A CN 107652946 A CN107652946 A CN 107652946A
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Abstract
The invention belongs to technical field of composite preparation, it is related to the preparation that light porous structure absorbs microwave material, more particularly to a kind of preparation method of light porous nickel ferrite based magnetic loaded/carbon aerogels absorbing material, including forming carbon aerogels by extraction fiber, freeze-drying, high temperature carbonization by discarded pericarp, then by its with nickel ferrite based magnetic loaded is nanocrystalline is combined through 150~200 DEG C of 7~16h of hydro-thermal reaction.Absorbing material obtained by the present invention is on the basis of nickel ferrite based magnetic loaded magnetic effect is kept, with specific surface area is big, density is small, voidage is big, conductive, magnetic characteristic, it can be realized by way of resistance loss, electromagnetic consumable, interfacial polarization loss and multistep reflection-absorption and electromagnetic wave wideband is absorbed by force, minimal reflection loss inhales ripple effective bandwidth between 2~4dB between 20~50dB during use.The made light porous nickel ferrite based magnetic loaded/carbon aerogels absorbing material of the present invention can be applied to the fields such as radar invisible, electromagnetic interference shield, microwave dark room, have the characteristics of wide material sources, cost is cheap.
Description
Technical field
The invention belongs to technical field of composite preparation, is related to the preparation that light porous structure absorbs microwave material, tool
Body is related to a kind of preparation method and applications of light porous absorbing material.
Background technology
With the high speed development of electronic technology, electronics, electrical equipment or other information system is more and more extensive is applied to
Daily life, the every field of work production.Electronic equipment is widely used and developed, and is brought to people's life very big
Facility, be also greatly facilitate the fast development of social economy, but caused electromagnetic radiation is for human health and ecology
Environment has a huge impact.If the electromagnetic radiation for being not added with effectively controlling causes the interference between various electronic equipments, even
Failure will be caused.Therefore, study and utilize absorbing material to effective control of electromagnetic radiation for improving electromagnetic environment, improving people
Class quality of life is extremely important.
At present, electromagnetic consumable type and resistance loss can be divided into according to the research of the loss mechanism to electromagnetic wave, absorbing material
Type, heat energy is converted into by electrical loss and magnetic loss, realizes the absorption to incident electromagnetic wave.It is cheap with wide material sources, cost
Plant pericarp is raw material, the fiber carbon aerogels obtained by extracting pericarp, with aeroge density is low, refractive index is low, space
The advantages of rate is high, specific surface area is big, and there is excellent electrical loss ability, unfortunately carbon aerogels do not have electromagnetic consumable
Energy.Nickel ferrite based magnetic loaded has good superparamagnetism, has preferable impedance concurrently as the soft magnetic material being widely used in industry
With with electromagnetic consumable characteristic, but limit its application in reality the characteristics of its density is big, temperature stability is poor.
Using carbon aerogels specific surface area is big and the characteristic of the nanocrystalline electromagnetic consumable of nickel ferrite based magnetic loaded, by nickel ferrite based magnetic loaded is nanocrystalline and carbon
Aeroge is compound, not only overcomes deficiency of the carbon aerogels without magnetic particles, and reduces that nickel ferrite based magnetic loaded is nanocrystalline to be made
Dosage, and improve the stability of nickel ferrite based magnetic loaded, obtain has that electrical loss and magnetic loss, Impedance matching be good, absorption band simultaneously
The porous absorbing material of wide novel light.The material can be reflected by electrical loss, magnetic loss, interfacial polarization loss and multistep and be inhaled
Electromagnetic wave is received, realizes that incidence wave wideband absorbs by force.
The content of the invention
For above-mentioned the deficiencies in the prior art, the purpose of the present invention is to disclose a kind of light porous nickel ferrite based magnetic loaded/life
The preparation method of material carbon aerogels absorbing material, obtained material have good Impedance matching, stronger electrical loss with
Magnetic loss performance.
A kind of preparation method of light porous absorbing material, comprises the following steps：
a）The pretreatment of pericarp：Plant pericarp is soaked into 2~5h in organic solvent, with ethanol and deionized water alternately washing 2
~4 times, mechanical crushing；
b）The stripping of pericarp fiber：The alkali soluble that 100~300 mL concentration are 0.1~1mol/L is added by every 100g pretreatment pericarps
Liquid meter, preferably 200 mL, 0.5mol/L, 3~10h, preferably 90 DEG C heating 7h, after taking-up are heated in 70~100 DEG C of water-baths
Separation is filtered, by residue washing to neutrality, obtains the pericarp fiber of moistening；
c）The preparation of carbon aerogels；It is 1 by the volume ratio of above-mentioned pericarp fiber and deionized water:1~1:3, preferably 1:1 meter, will
Pericarp fiber is well mixed with deionized water, is freeze-dried 30~40h at -70~-40 DEG C, preferably -55 DEG C of lyophilized 35h, is obtained fine
Tie up aeroge；Gained fiber aeroge is placed in tube furnace, heated up under nitrogen protection from room temperature with 6 DEG C/min heating rate
To 350~500 DEG C of 1~4h of charing, preferably 400 DEG C charing 2h, room temperature is then down to, obtains carbon aerogels；
d）The preparation of nickel ferrite based magnetic loaded/carbon aerogels：It is 1 by the mol ratio of nickel salt and molysite：2 meters, by 0.01~0.2mol/L, preferably
0.1mol/L nickel salt solution and 0.01~0.2mol/L, preferably 0.1mol/L iron salt solutions mix, excellent by 0.1~1mol/L
Select 0.1mol/L aqueous slkali be added dropwise mixed solution to pH be 8~9, obtain dirty solution；, will be obtained based on 4~8mg/L
Carbon aerogels are added in reactor with dirty solution, and 7~16h is reacted at 150~200 DEG C, 10h is reacted at preferably 180 DEG C, takes out and uses
Deionized water is washed 2~5 times, 4~8h of air drying, obtains nickel ferrite based magnetic loaded/carbon aerogels absorbing material.
In the more excellent disclosed example of the present invention, step a）The pericarp is banana skin, apple skin, durian peel, orange peel, western fruit
One or more combinations in skin, pomelo peel etc..
In the more excellent disclosed example of the present invention, step a）The organic solvent is toluene, chloroform, paraxylene, ethanol, adjacent diformazan
One or more combinations in benzene, tetrahydrofuran, hexamethylene etc..
In the more excellent disclosed example of the present invention, step b）The aqueous slkali is that sodium hydroxide solution, potassium hydroxide solution, ammoniacal liquor are molten
One or more combinations in liquid etc..
In the more excellent disclosed example of the present invention, step d）The nickel salt is nickel chloride, nickel sulfate, nickelous bromide, nickel nitrate, acetic acid
One or more combinations in nickel, nickel formate etc..
In the more excellent disclosed example of the present invention, step d）The molysite is in iron chloride, ferric sulfate, ironic citrate, ferric acetate etc.
One or more combinations.
In the more excellent disclosed example of the present invention, step d）Described aqueous slkali is in NaOH solution, KOH solution, ammonia spirit etc.
One or more combinations.
Another object of the present invention, it is that disclosing obtained light porous nickel ferrite based magnetic loaded/carbon aerogels inhales ripple material
The application of material.
Light porous nickel ferrite based magnetic loaded/carbon aerogels absorbing material according to made from the above method of the present invention, specific surface area between
200~800m2/ g, electrical conductivity are minimum between 0.7~9emu/g, and during use between 0.01~0.8S/m, saturation magnetic field intensity
Reflection loss inhales ripple effective bandwidth between 2~4dB between -20~-50dB.Resistance loss, electromagnetic consumable, interface pole can be passed through
The mode of change loss and multistep reflection-absorption is realized to be absorbed by force to electromagnetic wave wideband.Absorbing material can be used as to be applied to radar hidden
The technical fields such as body, electromagnetic interference shield, microwave dark room.
Beneficial effect
It is obtained the invention discloses a kind of preparation method by carbon aerogels and the absorbing material of nickel ferrite based magnetic loaded nanocomposite
Absorbing material has the characteristics of conduction, magnetic, low-density, high-specific surface area, high voidage, Impedance matching simultaneously.The present invention
Using discarded pericarp as raw material, wide material sources, cost are cheap.There is obtained absorbing material electromagnetic consumable to inhale ripple, resistance damage
Consumption inhales the characteristic of ripple, interfacial polarization loss and multistep reflection-absorption, can be achieved to absorb incident electromagnetic wave wideband by force, minimum anti-
Loss is penetrated between -20~-50dB, inhales ripple effective bandwidth between 2~4dB.
Embodiment
With reference to embodiment, the present invention is described in detail, so that those skilled in the art more fully understand this hair
It is bright, but the invention is not limited in following examples.
Embodiment 1
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 3h in toluene, alternately washed 4 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution that 200 mL concentration are 0.5mol/L
Meter, heats 7h in 90 DEG C of water-baths, and filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:1~1:3 meters, by deionized water and fruit
Hide fiber is well mixed, and is dried 35h at -55 DEG C in freeze drier, is obtained fiber aeroge；By the fiber aeroge of gained
It is placed in tube furnace, is warming up to 400 DEG C of charing 2h from room temperature with 6 DEG C/min programming rate under nitrogen protection, then drops
To room temperature, carbon aerogels are obtained；
Step d）It is 1 by the mol ratio of nickel chloride and iron chloride：2 meters, by 0.1mol/L nickel chloride solution and 0.1mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L potassium hydroxide solution is added dropwise to mixed solution
Liquid pH is 8, obtains dirty solution.Based on 8mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 200
10h is reacted at DEG C, is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 2
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Apple skin is soaked into 2h in chloroform, alternately washed 4 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the potassium hydroxide solution that 100 mL concentration are 0.1mol/L
Meter, heats 5h in 100 DEG C of water-baths, and filtered off with suction separates after taking-up, and by residue washing to neutrality, the pericarp for obtaining moistening is fine
Dimension；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:2 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -55 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 350 DEG C of charing 3h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel sulfate and iron chloride：2 meters, by 0.2mol/L nickel chloride solution and 0.2mol/L
Ferric chloride solution mixes, and obtains mixed solution.0.1mol/L ammonia spirit is added dropwise to mixed solution to mixed solution pH
For 9, dirty solution is obtained.Based on 6mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, at 180 DEG C
16h is reacted, is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 3
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 5h in paraxylene, alternately washed 4 times with ethanol and deionized water, using mechanical crushing
Mode, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution meter that 200 mL concentration are 1mol/L,
10h is heated in 100 DEG C of water-baths, filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:3 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -55 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 400 DEG C of charing 2h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel chloride and ferric sulfate：2 meters, by 0.1mol/L nickel chloride solution and 0.2mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L potassium hydroxide solution is added dropwise to mixed solution
Liquid pH is 9, obtains dirty solution.Based on 4mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 180
7h is reacted at DEG C, is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 4
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Apple skin is soaked into 3h in ortho-xylene, alternately washed 4 times with ethanol and deionized water, using mechanical crushing
Mode, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the potassium hydroxide solution that 300 mL concentration are 0.5mol/L
Meter, heats 7h in 80 DEG C of water-baths, and filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:1 meter, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -55 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 500 DEG C of charing 2h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel nitrate and ferric acetate：2 meters, by 0.15mol/L nickel chloride solution and 0.2mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L sodium hydroxide solution is added dropwise to mixed solution
Liquid pH is 8, obtains dirty solution.Based on 6mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 200
16h is reacted at DEG C, is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 5
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 5h in toluene, alternately washed 4 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution that 200 mL concentration are 0.5mol/L
Meter, heats 3h in 100 DEG C of water-baths, and filtered off with suction separates after taking-up, and by residue washing to neutrality, the pericarp for obtaining moistening is fine
Dimension；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:2 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -55 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 450 DEG C of charing 4h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickelous bromide and ironic citrate：2 meters, by 0.05mol/L nickel chloride solution and 0.1mol/L
Ferric chloride solution mix, obtain mixed solution.0.1mol/L ammonia spirit is added dropwise to mixed solution to mixed solution
PH is 8, obtains dirty solution.Based on 8mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 150 DEG C
Lower reaction 10h, it is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 6
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Pomelo peel is soaked into 3h in tetrahydrofuran, alternately washed 4 times with ethanol and deionized water, using mechanical crushing
Mode, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the potassium hydroxide solution meter that 100 mL concentration are 1mol/L,
7h is heated in 90 DEG C of water-baths, filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:2 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -55 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 400 DEG C of charing 2h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel sulfate and ferric nitrate：2 meters, by 0.1mol/L nickel chloride solution and 0.15mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L potassium hydroxide solution is added dropwise to mixed solution
Liquid pH is 9, obtains dirty solution.Based on 4mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 200
16h is reacted at DEG C, is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 7
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 3h in toluene, alternately washed 4 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution that 200 mL concentration are 0.5mol/L
Meter, heats 10h in 90 DEG C of water-baths, and filtered off with suction separates after taking-up, and by residue washing to neutrality, the pericarp for obtaining moistening is fine
Dimension；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:1 meter, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -55 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 500 DEG C of charing 3h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel acetate and iron chloride：2 meters, by 0.2mol/L nickel chloride solution and 0.1mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L sodium hydroxide solution is added dropwise to mixed solution
Liquid pH is 8, obtains dirty solution.Based on 6mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 180
10h is reacted at DEG C, is washed with deionized after taking-up 4 times, air drying 6h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 8
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 5h in ethanol, alternately washed 2 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution that 300 mL concentration are 0.1mol/L
Meter, heats 10h in 100 DEG C of water-baths, and filtered off with suction separates after taking-up, and by residue washing to neutrality, the pericarp for obtaining moistening is fine
Dimension；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:3 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 30h at -70 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 350 DEG C of charing 4h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel chloride and ferric sulfate：2 meters, by 0.01mol/L nickel chloride solution and 0.01mol/L
Ferric chloride solution mix, obtain mixed solution.0.1mol/L potassium hydroxide solution is added dropwise to mixed solution to mixing
PH value of solution is 9, obtains dirty solution.Based on 8mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor,
16h is reacted at 150 DEG C, is washed with deionized after taking-up 2 times, air drying 4h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 9
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 5h in tetrahydrofuran, alternately washed 3 times with ethanol and deionized water, using mechanical crushing
Mode, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution that 100 mL concentration are 0.5mol/L
Meter, heats 3h in 70 DEG C of water-baths, and filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:2 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 40h at -40 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 450 DEG C of charing 3h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel chloride and ferric sulfate：2 meters, by 0.2mol/L nickel chloride solution and 0.2mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L potassium hydroxide solution is added dropwise to mixed solution
Liquid pH is 8, obtains dirty solution.Based on 6mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 200
7h is reacted at DEG C, is washed with deionized after taking-up 5 times, air drying 8h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 10
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 5h in hexamethylene, alternately washed 4 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution that 200 mL concentration are 0.1mol/L
Meter, heats 5h in 80 DEG C of water-baths, and filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:1 meter, deionized water and pericarp is fine
Dimension is well mixed, dries 35h at -70 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 500 DEG C of charing 1h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel chloride and ferric sulfate：2 meters, by 0.01mol/L nickel chloride solution and 0.01mol/L
Ferric chloride solution mix, obtain mixed solution.0.1mol/L potassium hydroxide solution is added dropwise to mixed solution to mixing
PH value of solution is 8, obtains dirty solution.Based on 8mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor,
10h is reacted at 200 DEG C, is washed with deionized after taking-up 4 times, air drying 4h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiment 11
A kind of preparation method of light porous absorbing material, comprises the following steps：
Step a）Banana skin is soaked into 5h in chloroform, alternately washed 4 times with ethanol and deionized water, using mechanical crushing side
Formula, plant pericarp is crushed；
Step b）By every 100g steps a）The pericarp of gained pretreatment adds the sodium hydroxide solution meter that 150 mL concentration are 1mol/L,
7h is heated in 90 DEG C of water-baths, filtered off with suction separates after taking-up, by residue washing to neutrality, obtains the pericarp fiber of moistening；
Step c）By step b）The pericarp fiber of gained and the volume ratio of deionized water are 1:2 meters, deionized water and pericarp is fine
Dimension is well mixed, dries 40h at -40 DEG C in freeze drier, obtains fiber aeroge；The fiber aeroge of gained is placed
In tube furnace, 350 DEG C of charing 4h are warming up to from room temperature with 6 DEG C/min programming rate under nitrogen protection, are then down to room
Temperature, obtain carbon aerogels；
Step d）It is 1 by the mol ratio of nickel chloride and ferric sulfate：2 meters, by 0.2mol/L nickel chloride solution and 0.2mol/L
Ferric chloride solution mixes, and obtains mixed solution.It is molten to mixing that 0.1mol/L potassium hydroxide solution is added dropwise to mixed solution
Liquid pH is 8, obtains dirty solution.Based on 4mg/L, by step d）In obtained carbon aerogels and dirty solution be added in reactor, 200
16h is reacted at DEG C, is washed with deionized after taking-up 3 times, air drying 8h, obtains nickel ferrite based magnetic loaded/carbon aerogels.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification is made, or other related technical areas are directly or indirectly used in,
Similarly it is included within the scope of the present invention.
Claims (8)
1. a kind of preparation method of light porous absorbing material, it is characterised in that comprise the following steps：
a）Plant pericarp is soaked into 2~5h in organic solvent, with ethanol and deionized water alternately washing 2~4 times, mechanical powder
It is broken；
b）Added by every 100g pretreatment pericarps based on the aqueous slkali that 100~300 mL concentration are 0.1~1mol/L, preferably 200
ML, 0.5mol/L, 3~10h is heated in 70~100 DEG C of water-baths, preferably 90 DEG C heating 7h, separation is filtered after taking-up, will be filtered
Wash heat is washed to neutrality, obtains the pericarp fiber of moistening；
c）It is 1 by the volume ratio of above-mentioned pericarp fiber and deionized water:1~1:3, preferably 1:1 meter, by pericarp fiber and deionization
Water is well mixed, and is freeze-dried 30~40h at -70~-40 DEG C, preferably -55 DEG C of lyophilized 35h, is obtained fiber aeroge；Gained is fine
Dimension aeroge is placed in tube furnace, and 350~500 DEG C of charings 1 are warming up to from room temperature with 6 DEG C/min heating rate under nitrogen protection
~4h, preferably 400 DEG C charing 2h, is then down to room temperature, obtains carbon aerogels；
d）It is 1 by the mol ratio of nickel salt and molysite：2 meters, by 0.01~0.2mol/L, preferably 0.1mol/L nickel salt solution with
0.01~0.2mol/L, preferably 0.1mol/L iron salt solutions are mixed, by 0.1~1mol/L, preferably 0.1mol/L aqueous slkali by
It is 8~9 that mixed solution, which is added dropwise to, to pH, obtains dirty solution；Based on 4~8mg/L, obtained carbon aerogels and dirty solution are added
In reactor, 7~16h to be reacted at 150~200 DEG C, 10h is reacted at preferably 180 DEG C, taking-up is washed with deionized 2~5 times,
4~8h of air drying, obtain nickel ferrite based magnetic loaded/carbon aerogels absorbing material.
2. the preparation method of light porous absorbing material according to claim 1, it is characterised in that：Step a）It is described organic molten
Agent is one or more combinations in toluene, chloroform, paraxylene, ethanol, ortho-xylene, tetrahydrofuran, hexamethylene.
3. the preparation method of light porous absorbing material according to claim 1, it is characterised in that：Step d）The nickel salt is
One or more combinations in nickel chloride, nickel sulfate, nickelous bromide, nickel nitrate, nickel acetate, nickel formate.
4. the preparation method of light porous absorbing material according to claim 1, it is characterised in that：Step d）The molysite is
One or more combinations in iron chloride, ferric sulfate, ironic citrate, ferric acetate.
5. according to the preparation method of the light porous absorbing material of claim 1, it is characterised in that：Step b）With step d）The alkali
Solution is one or more combinations in sodium hydroxide solution, potassium hydroxide solution, ammonia spirit.
6. according to light porous absorbing material made from any methods describeds of claim 1-5.
7. light porous absorbing material according to claim 6, it is characterised in that：200~the 800m of material specific surface area2/
G, 0.01~0.8S/m of electrical conductivity, saturation magnetic field 0.7~9emu/g of intensity, during use minimal reflection loss between -20~-
50dB, ripple effective bandwidth is inhaled between 2~4dB.
A kind of 8. application of light porous absorbing material as claimed in claim 6, it is characterised in that：Should as absorbing material
For radar invisible, electromagnetic interference shield, microwave dark room technical field.
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| CN108521754A (en) * | 2018-04-11 | 2018-09-11 | 南京航空航天大学 | Porous carbon-based electromagnetic wave absorption agent of one kind and preparation method thereof |
| CN109734448A (en) * | 2019-03-19 | 2019-05-10 | 电子科技大学 | A kind of preparation method of carbon aerogels base electromagnetic screen material |
| CN111282522A (en) * | 2020-02-10 | 2020-06-16 | 四川大学 | Metal organic framework composite aerogel material and preparation method and application thereof |
| CN113023723A (en) * | 2021-02-04 | 2021-06-25 | 南京航空航天大学 | Electromagnetic wave-absorbing material prepared from shaddock peel and preparation method thereof |
| CN113271758A (en) * | 2021-04-19 | 2021-08-17 | 杭州电子科技大学 | Electromagnetic wave shielding breathable porous carbon composite material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108521754A (en) * | 2018-04-11 | 2018-09-11 | 南京航空航天大学 | Porous carbon-based electromagnetic wave absorption agent of one kind and preparation method thereof |
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| CN113023723B (en) * | 2021-02-04 | 2023-12-01 | 南京航空航天大学 | Electromagnetic wave-absorbing material prepared from shaddock peel and preparation method thereof |
| CN113271758A (en) * | 2021-04-19 | 2021-08-17 | 杭州电子科技大学 | Electromagnetic wave shielding breathable porous carbon composite material and preparation method and application thereof |
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