CN110482526A - It is a kind of using egg white as the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma - Google Patents
It is a kind of using egg white as the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma Download PDFInfo
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Abstract
It is a kind of using egg white as the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma, belong to electromagnetic-wave absorbent preparation technical field.The method are as follows: egg white is pre-processed to obtain uniform protein solution；Solution of potassium carbonate is added into protein solution, forms homogeneous solution, titration carries out Ultrasonic Pulverization, obtains precursor solution；Precursor solution is subjected to heating water bath to get porous carbon matrix precursor is arrived；It is freezed, then is freeze-dried with liquid nitrogen, obtain dry porous carbon matrix precursor；By dry porous carbon matrix precursor under argon atmosphere, heating carbonization.The selection that the present invention has widened the carbon source material of porous carbon is compared with other carbon source materials, and carbon source selected by the present invention belongs to reproducible biomass, and low in cost.Porous carbon materials have big specific surface area, and due to the introducing of nitrogen, there is a large amount of activity to scatter site, therefore have good electromagnetic wave absorption performance.
Description
Technical field
The invention belongs to electromagnetic-wave absorbent preparation technical fields, and in particular to a kind of using egg white as the biology of presoma
The preparation method of matter porous carbon electromagnetic-wave absorbent.
Background technique
Electromagnetic-wave absorbent is with military (electromagnetism stealth etc. for being mainly used in opportunity of combat) and civilian (for mankind itself
Health consideration reduce electromagnetic wave radiation etc.) demand continuous development, have become the hot spot now studied.
Traditional electromagnetic-wave absorbent is mainly ferromagnetic metal element and its oxide, though such absorbing material
So there are good absorbent properties, but the feature big due to metallic element density itself leads to the ratio wave-sucking performance of material simultaneously
It is not very high.And solve the mechanical soft of metallic element electromagnetic-wave absorbent by the electromagnet absorbing material of representative of porous carbon
Poor, perishable, processing the is complicated and expensive problem of toughness.
The technology of preparing of porous carbon has tended to be perfect in recent years, and the application in various fields has also attracted domestic and international crowd
The research interest of more scholars.Porous carbon materials become electromagnetism suction due to many advantages, such as its is light, porous, resistance consumption is strong
The new research object in wave field.
Biomass is a kind of carbon source material of rich content, can simply and efficiently be solved by the carbonization to biomass
The doping of nitrogen obtains a kind of lightweight, efficient, durable electromagnetic-wave absorbent.But up to the present, porous carbon is in electricity
The application in magnetic wave field does not obtain the application in large-scale engineering, furthermore porous carbon still in laboratory stage
The carbonization moulding mechanism of material is still fuzzy.Although the wave-sucking performance of porous C-base composte material is very outstanding, porous carbon
There are still the spaces of promotion for contribution of the matrix to electromagnetic wave absorption itself.Porous carbon materials macroscopic body is designed with microporous structure
Property is poor, not can manufacture, the disadvantages of structure designability is poor.Therefore, pass through different presoma selections, different preparation works
Skill etc. carries out structure design to porous carbon materials macroscopic body, and there is great research potentials.
Summary of the invention
The problem that the purpose of the present invention is to solve existing electromagnetic-wave absorbent density greatly, lower than inhaling intensity of wave, provides
It is a kind of using egg white as the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma, this method is in a manner of self assembly
The doping in situ of the miscellaneous element of realization from bottom to top, realizes the design of the material and structure to porous carbon, has widened porous
The carbon source of carbon material selects, and realizes good electromagnetic performance.Compared with other electromagnetic-wave absorbents, the present invention relates to life
The substance porous carbon materials not subsequent doping of ferromagnetic metal element during the preparation process, by utilizing reproducible biomass
A kind of low-density, the electromagnetic-wave absorbent of high wave absorbing efficiency is prepared as raw material in egg white.
To achieve the above object, the technical solution adopted by the present invention is as follows:
It is a kind of using egg white as the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma, the method step
It is as follows:
Step 1: the pretreatment of egg white: egg white is pre-processed in the way of physical dispersion to obtain uniform albumen
Matter solution；
Step 2: potassium carbonate the preparation of precursor solution: is added or is added without into the protein solution that step 1 obtains
Solution forms homogeneous solution, is titrated with deionized water, carry out Ultrasonic Pulverization to liquid with ultrasonic cell disrupte machine, obtains uniformly
Precursor solution；
Step 3: the preparation of porous carbon matrix precursor: the precursor solution that step 2 is obtained carries out water bath with thermostatic control heating, i.e.,
Obtain porous carbon matrix precursor；
Step 4: the drying of porous carbon matrix precursor: the porous carbon matrix precursor that step 3 is obtained is freezed with liquid nitrogen, then
It is freeze-dried in freeze drier, obtains dry porous carbon matrix precursor；
Step 5: the carbonization of presoma: by dry porous carbon matrix precursor under argon atmosphere, being carbonized with diamond heating
Obtain the biomass porous carbon electromagnetic-wave absorbent using egg white as presoma.
The present invention having the beneficial effect that compared with the prior art
1, the selection for the carbon source material that the present invention has widened porous carbon is compared with other carbon source materials, selected by the present invention
Carbon source belong to reproducible biomass, and it is low in cost.Porous carbon materials have big specific surface area, and due to nitrogen
It introduces, there is a large amount of activity to scatter site, therefore there is good electromagnetic wave absorption performance.
2, realize that the in situ of nitrogen is adulterated using protein, it is low in cost, step is simple, so that porous carbon materials is interior
Portion generates a large amount of activity scattering site, so that the electromagnetic wave absorption performance of porous carbon greatly improves.
3, the present invention realizes the nitrogen-doping to porous carbon by the way of adulterating in situ, in three-dimensional porous carbon material
Thickness when being less than 2mm electromagnetic wave absorption intensity can reach 60dB or more, and there is lighter density, be 0.1~0.3g/cm3。
4, biomass porous carbon material prepared by the present invention has good electromagnetic wave absorption performance and lighter quality, more
Its electromagnetic wave absorption peak value reaches 60.67dB when hole carbon material thickness is only 1.34mm, therefore of the present invention biomass porous
Carbon is a kind of excellent electromagnetic-wave absorbent.
Detailed description of the invention
Fig. 1 is the dielectric constant of biomass porous carbon and the relation schematic diagram of frequency obtained in embodiment 2；
Fig. 2 is the magnetic conductivity of biomass porous carbon and the relation schematic diagram of frequency obtained in embodiment 2；
Fig. 3 is the dielectric loss tangent angle schematic diagram of biomass porous carbon obtained in embodiment 2；
Fig. 4 is the magnetic loss tangent angle schematic diagram of biomass porous carbon obtained in embodiment 2；
Fig. 5 is that the theoretical of acquired biomass porous carbon in embodiment 2 inhales wave number 3D schematic diagram；
Fig. 6 is the fiber bundle-like structure shape feature microscopic appearance figure of biomass porous carbon obtained in embodiment 1；
Fig. 7 is the multistage hole shape structure shape feature microscopic appearance figure of biomass porous carbon obtained in embodiment 3；
Fig. 8 is the microscopic appearance figure for the biomass porous carbon that embodiment 1 obtains；
Fig. 9 is the microscopic appearance figure for the biomass porous carbon that embodiment 2 obtains；
Figure 10 is the microscopic appearance figure for the biomass porous carbon that embodiment 3 obtains.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples, and however, it is not limited to this,
It is all that modifying or equivalently replacing the technical solution of the present invention, without departing from the spirit and scope of the technical solution of the present invention,
It should all cover within the protection scope of the present invention.
Specific embodiment 1: present embodiment record is a kind of using egg white as the biomass porous carbon of presoma electricity
The preparation method of magnetic wave material passes through the thermal denaturation principle of protein, heating using egg white, potassium carbonate as raw material
Presoma is prepared, and further high temperature cabonization obtains N doping porous carbon under an argon atmosphere；The method comprises the following steps:
Step 1: the pretreatment of egg white: egg white is pre-processed in the way of physical dispersion to obtain uniform albumen
Matter solution；
Step 2: potassium carbonate the preparation of precursor solution: is added or is added without into the protein solution that step 1 obtains
If solution be added, be added dropwise while stirring, formed homogeneous solution, titrated with deionized water, with ultrasonic cell disrupte machine to liquid into
Row Ultrasonic Pulverization obtains uniform precursor solution；
Step 3: the preparation of porous carbon matrix precursor: the precursor solution that step 2 is obtained carries out constant temperature in water-bath
Heating water bath, protein denaturation gel obtain aquogel system to get porous carbon matrix precursor is arrived；
Step 4: the drying of porous carbon matrix precursor: the porous carbon matrix precursor that step 3 is obtained is freezed with liquid nitrogen, then
It is freeze-dried in freeze drier, obtains dry porous carbon matrix precursor；In the refrigerating process, hydrogel should be kept
The stabilization of system, the interference such as no shaking, and ensure that aquogel system freezing is complete；In the freezing dry process, it should ensure that
Porous carbon matrix precursor is dry complete；For liquid nitrogen frozen, temperature is -192 DEG C, cooling time should according to forerunner's scale of construction number
It determines, different freezing equipments its cooling time difference, as long as guaranteeing that freezing is complete: present invention institute in operation
Ten minutes are probably needed when the mold single freezing 30ml presoma being related to.For freeze drier, the freezing of different model is dry
The temperature and time of the program setting of dry machine has certain discrepancy, as long as guaranteeing dry complete: present invention freeze-drying
The temperature of machine is -60 DEG C, and drying time is 168h (7 days).
Step 5: the carbonization of presoma: by dry porous carbon matrix precursor under argon atmosphere, being carbonized with diamond heating
Obtain the biomass porous carbon electromagnetic-wave absorbent using egg white as presoma.
Specific embodiment 2: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment one
The preparation method of electromagnetic-wave absorbent in step 1, fresh egg white is separated from egg, with ultrasonic cell disrupte machine
Ultrasonic Pulverization is carried out, uniform protein (for main component) solution is obtained.
Specific embodiment 3: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment two
The preparation method of electromagnetic-wave absorbent, the mass fraction of protein is 10 ± 5wt% (different egg in the protein solution
The mass fraction of protein will be different in obtained protein solution).
Specific embodiment 4: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment two
The preparation method of electromagnetic-wave absorbent, the power of the Ultrasonic Pulverization are the 5~15% of ultrasonic cell disrupte machine power, and the time is
1~2min.
Specific embodiment 5: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment one
The preparation method of electromagnetic-wave absorbent, in step 2, the mass concentration of the solution of potassium carbonate is 25wt%；The potassium carbonate is molten
The mass ratio for the protein solution that liquid and step 1 obtain is 0~0.2:1, preferably 0.1；The requirement of the deionized water titration
Are as follows: protein solution obtained in step 1 accounts for the 50vol% of the precursor solution obtained after titration.
Specific embodiment 6: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment one
The preparation method of electromagnetic-wave absorbent, in step 2, the power of the Ultrasonic Pulverization be ultrasonic cell disrupte machine power 10~
20%, preferably 10%, the time is 3~5min, suitably can turn down power and extend time of crushing.
Specific embodiment 7: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment one
The preparation method of electromagnetic-wave absorbent, in step 3, the temperature of the heating water bath is 80 DEG C, and the time is 1~2h, preferably
1h。
Specific embodiment 8: a kind of using egg white as the biomass porous carbon of presoma described in specific embodiment one
The preparation method of electromagnetic-wave absorbent, in step 5, the actual conditions of the carbonization are as follows: first it is carbonized in advance at 240~320 DEG C,
Heating rate in pre- carbonisation is 2 DEG C/min, then the carbonization treatment 2h at 600~800 DEG C, preferably carburizing temperature are
700℃.Heating rate in pre- carbonisation refers to the state that heating is to maintain in pre- carbonisation, it is specified that heating speed
Rate and the temperature range being carbonized in advance, the time being carbonized in advance be it is certain, be the equal of: the time being carbonized in advance be 40min.
Embodiment 1:
It is a kind of real according to the following steps by the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma of egg white
It is existing:
Step 1: the pretreatment of egg white: being pre-processed to obtain uniform albumen to egg white in the way of physical dispersion
Matter solution, the specific steps are as follows: fresh egg white is separated from egg, carries out ultrasonic powder with ultrasonic cell disrupte machine
It is broken, obtain uniform protein (for main component) solution, in which: the mass fraction of protein is in the protein solution
11.5wt%；The power of Ultrasonic Pulverization is the 5% of ultrasonic cell disrupte machine power, grinding time 1min；
Step 2: the preparation of precursor solution: it is added without solution of potassium carbonate, certain volume is titrated to deionized water,
Ultrasonic Pulverization is carried out to liquid with ultrasonic cell disrupte machine, obtains uniform precursor solution, in which: the titration requirement,
Protein solution obtained in step 1 accounts for the 50% of the precursor solution volume fraction obtained after titration；The function of the crushing
Rate is the 10% of ultrasonic cell disrupte machine power, grinding time 3min；
Step 3: the preparation of porous carbon matrix precursor: precursor solution obtained in step 2 is carried out to perseverance in water-bath
Tepidarium heating, protein denaturation gel obtains aquogel system, in which: the temperature of the heating water bath is 80 DEG C, and the time is
1h；
Step 4: the drying of porous carbon matrix precursor: porous carbon matrix precursor being freezed with liquid nitrogen, then in freeze drier
In be freeze-dried, obtain dry porous carbon matrix precursor, in which: in the refrigerating process, aquogel system should be kept
Stablize, the interference such as no shaking, and ensures that aquogel system freezing is complete；In the freezing dry process, porous carbon should ensure that
Presoma is dry complete；For liquid nitrogen frozen, temperature is -192 DEG C, cooling time should according to forerunner's scale of construction number determine
Fixed, different its cooling time of freezing equipment difference, as long as guaranteeing that freezing is complete: the present invention is involved in operation
Mold single freeze 30ml presoma when probably need ten minutes.For freeze drier, the freeze drier of different model
The temperature and time of program setting have certain discrepancy, as long as guaranteeing dry complete: freeze drier of the present invention
Temperature is -60 DEG C, and drying time is 168h (7 days).
Step 5: the carbonization of presoma: by dry porous carbon matrix precursor under argon atmosphere, being carbonized with diamond heating
Obtain the biomass porous carbon electromagnetic-wave absorbent using egg white as presoma, in which: the actual conditions of the carbonization are as follows: with 5
DEG C/min is warming up to 320 DEG C from 240 DEG C from room temperature to 240 DEG C with 2 DEG C/min, then is warming up to carburizing temperature with 5 DEG C/min
700 DEG C, and kept for 2 hours to get the biomass porous carbon electromagnetic-wave absorbent of N doping is arrived.
What the present embodiment obtained is the biomass porous carbon electromagnetic-wave absorbent of presoma compared to other electromagnetism using egg white
Absorbing material has the characteristics that lightweight, efficient, the maximum absorption band when the thickness of material is only 1.61mm, at 17.16GHz
Value is 55.9084dB, and it is excellent electromagnetic-wave absorbent that it is 5.82GHz that wave width is effectively inhaled when with a thickness of 1.79mm.Such as figure
Shown in 8, for the microscopic appearance figure for the biomass porous carbon that the present embodiment obtains.Fig. 6 obtains biomass porous for the present embodiment
The fiber bundle-like structure shape feature microscopic appearance figure of carbon, is observed that one layer of fine and closely woven fiber bundle layer on the surface of porous carbon.
Embodiment 2:
It is a kind of real according to the following steps by the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma of egg white
It is existing:
Step 1: the pretreatment of egg white: being pre-processed to obtain uniform albumen to egg white in the way of physical dispersion
Matter solution, the specific steps are as follows: fresh egg white is separated from egg, carries out ultrasonic powder with ultrasonic cell disrupte machine
It is broken, obtain uniform protein (for main component) solution, in which: the mass fraction of protein is in the protein solution
9.5wt% (mass fraction of protein will be different in the protein solution that different eggs obtains)；The function of Ultrasonic Pulverization
Rate is that ultrasonic cell disrupte machine power is 10%, grinding time 2min；
Step 2: the preparation of precursor solution: the protein solution for taking a certain amount of step 1 to obtain uses deionized water drop
It is fixed, Ultrasonic Pulverization is carried out to liquid with ultrasonic cell disrupte machine, obtains uniform precursor solution, in which: the potassium carbonate is molten
The mass concentration of liquid is 25wt%；The mass ratio for the protein solution that solution of potassium carbonate described in step 2 is obtained with step 1 is
0.1:1；The titration requires, and protein solution obtained in step 1 accounts for the precursor solution volume fraction obtained after titration
50%；The power of the crushing is the 10% of ultrasonic cell disrupte machine power, grinding time 5min；
Step 3: the preparation of porous carbon matrix precursor: the precursor solution that step 2 is obtained carries out constant temperature in water-bath
Heating water bath, protein denaturation gel obtain aquogel system, in which: the temperature of the heating water bath is 80 DEG C, time 1h；
Step 4: the drying of porous carbon matrix precursor: porous carbon matrix precursor being freezed with liquid nitrogen, then in freeze drier
In be freeze-dried, obtain dry porous carbon matrix precursor, in which: in the refrigerating process, aquogel system should be kept
Stablize, the interference such as no shaking, and ensures that aquogel system freezing is complete；In the freezing dry process, porous carbon should ensure that
Presoma is dry complete；For liquid nitrogen frozen, temperature is -192 DEG C, cooling time should according to forerunner's scale of construction number determine
Fixed, different its cooling time of freezing equipment difference, as long as guaranteeing that freezing is complete: the present invention is involved in operation
Mold single freeze 30ml presoma when probably need ten minutes.For freeze drier, the freeze drier of different model
The temperature and time of program setting have certain discrepancy, as long as guaranteeing dry complete: freeze drier of the present invention
Temperature is -60 DEG C, and drying time is 168h (7 days).
Step 5: the carbonization of presoma: by dry porous carbon matrix precursor under argon atmosphere, being carbonized with diamond heating
Obtain the biomass porous carbon electromagnetic-wave absorbent using egg white as presoma, in which: the actual conditions of the carbonization are as follows: with 5
DEG C/min is warming up to 320 DEG C from 240 DEG C from room temperature to 240 DEG C with 2 DEG C/min, then is warming up to carburizing temperature with 5 DEG C/min
700 DEG C, and kept for 2 hours.
The present embodiment it is obtained using egg white be the biomass porous carbon electromagnetic-wave absorbent of presoma compared to other electricity
Magnetic wave material has the characteristics that lightweight, efficient, and when the thickness of material is only 2.21mm, maximum suction is reached at 7.76GHz
Crest value is 66.15dB, and effective suction wave bin width when with a thickness of 1.34mm is 5.09GHz, is higher than most of document report
The numerical value in road.Fig. 3, it is shown that the biomass porous carbon is mainly dielectric loss, and magnetic loss is to pass through electricity
Magnetic matching and realize；As shown in Figure 5, it can be seen that described to be inhaled by the biomass porous carbon electromagnetism of presoma of egg white
Wave material all has preferable electromagnetic wave absorption performance within the scope of 2~18GHz, and can be by adjusting the thickness of material 2
It is realized within the scope of~18GHz and effectively inhales wave.Fig. 1 is the dielectric constant for the biomass porous carbon that the present embodiment obtains and the pass of frequency
It is schematic diagram；Fig. 2 is the magnetic conductivity for the biomass porous carbon that the present embodiment obtains and the relation schematic diagram of frequency；Fig. 4 is this reality
Apply the magnetic loss tangent angle schematic diagram for the biomass porous carbon that example obtains；Fig. 9 is the biomass porous carbon that the present embodiment obtains
Microscopic appearance figure.
Embodiment 3:
It is a kind of real according to the following steps by the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma of egg white
It is existing:
Step 1: the pretreatment of egg white: being pre-processed to obtain uniform albumen to egg white in the way of physical dispersion
Matter solution, the specific steps are as follows: fresh egg white is separated from egg, carries out ultrasonic powder with ultrasonic cell disrupte machine
It is broken, obtain uniform protein (for main component) solution, in which: the mass fraction of protein is in the protein solution
11wt% (mass fraction of protein will be different in the protein solution that different eggs obtains)；The power of Ultrasonic Pulverization
It is the 10% of ultrasonic cell disrupte machine power, grinding time 2min；
Step 2: the preparation of precursor solution: solution of potassium carbonate is added drop-wise to the protein that step 1 obtains while stirring
Mixed solution is formed in solution, is titrated with deionized water, Ultrasonic Pulverization is carried out to liquid with ultrasonic cell disrupte machine, is obtained uniformly
Precursor solution, in which: the mass concentration of the solution of potassium carbonate be 25wt%；Solution of potassium carbonate described in step 2 and step
The mass ratio of rapid one obtained protein solution is 0.05:1；The titration requires, protein solution obtained in step 1
Account for the 50% of the precursor solution volume fraction obtained after titration；The power of the crushing is ultrasonic cell disrupte machine power
10%, grinding time 3min；
Step 3: the preparation of porous carbon matrix precursor: the precursor solution that step 2 is obtained carries out constant temperature in water-bath
Heating water bath, protein denaturation gel obtain aquogel system, in which: the temperature of the heating water bath is 80 DEG C, time 1h；
Step 4: the drying of porous carbon matrix precursor: porous carbon matrix precursor being freezed with liquid nitrogen, then in freeze drier
In be freeze-dried, obtain dry porous carbon matrix precursor, in which: in the refrigerating process, aquogel system should be kept
Stablize, the interference such as no shaking, and ensures that aquogel system freezing is complete；In the freezing dry process, porous carbon should ensure that
Presoma is dry complete；For liquid nitrogen frozen, temperature is -192 DEG C, cooling time should according to forerunner's scale of construction number determine
Fixed, different its cooling time of freezing equipment difference, as long as guaranteeing that freezing is complete: the present invention is involved in operation
Mold single freeze 30ml presoma when probably need ten minutes.For freeze drier, the freeze drier of different model
The temperature and time of program setting have certain discrepancy, as long as guaranteeing dry complete: freeze drier of the present invention
Temperature is -60 DEG C, and drying time is 168h (7 days).
Step 5: the carbonization of presoma: by dry porous carbon matrix precursor under argon atmosphere, being carbonized with diamond heating
Obtain the biomass porous carbon electromagnetic-wave absorbent using egg white as presoma, in which: the actual conditions of the carbonization are as follows: with 5
DEG C/min is warming up to 320 DEG C from 240 DEG C from room temperature to 240 DEG C with 2 DEG C/min, then is warming up to carburizing temperature with 5 DEG C/min
700 DEG C, and kept for 2 hours.
The present embodiment it is obtained using egg white be the biomass porous carbon electromagnetic-wave absorbent of presoma compared to other electricity
Magnetic wave material has the characteristics that lightweight, efficient, and when the thickness of material is only 2.21mm, wave absorbed crest value reaches at 7.76GHz
55.6687dB.Fig. 7 is the multistage hole shape structure shape feature microscopic appearance figure of the obtained biomass porous carbon of the present embodiment,
Porous carbon possesses the composite construction of macropore and aperture, and ditch still can be observed on hole wall and return shape texture；Figure 10 is the present embodiment
The microscopic appearance figure of obtained biomass porous carbon, it can be observed that the available rich content of introducing of potassium carbonate
Multistage pore structure.
Claims (8)
1. a kind of using egg white as the preparation method of the biomass porous carbon electromagnetic-wave absorbent of presoma, it is characterised in that: institute
It is as follows to state method and step:
Step 1: the pretreatment of egg white: egg white is pre-processed to obtain uniform protein in the way of physical dispersion molten
Liquid；
Step 2: the preparation of precursor solution: being added or be added without solution of potassium carbonate into the protein solution that step 1 obtains,
Homogeneous solution is formed, is titrated with deionized water, Ultrasonic Pulverization is carried out to liquid with ultrasonic cell disrupte machine, obtains uniform forerunner
Liquid solution；
Step 3: the precursor solution that step 2 obtains the preparation of porous carbon matrix precursor: is subjected to water bath with thermostatic control heating to get arriving
Porous carbon matrix precursor；
Step 4: the drying of porous carbon matrix precursor: the porous carbon matrix precursor that step 3 is obtained is freezed with liquid nitrogen, then cold
It is freeze-dried in lyophilizer, obtains dry porous carbon matrix precursor；
Step 5: the carbonization of presoma: by dry porous carbon matrix precursor under argon atmosphere, being carbonized to obtain with diamond heating
Using egg white as the biomass porous carbon electromagnetic-wave absorbent of presoma.
2. according to claim 1 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: in step 1, fresh egg white is separated from egg, surpassed with ultrasonic cell disrupte machine
Sound crushes, and obtains uniform protein solution.
3. according to claim 2 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: the mass fraction of protein is 10 ± 5wt% in the protein solution.
4. according to claim 2 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: the power of the Ultrasonic Pulverization be ultrasonic cell disrupte machine power 5~15%, the time be 1~
2min。
5. according to claim 1 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: in step 2, the mass concentration of the solution of potassium carbonate is 25wt%；The solution of potassium carbonate and step
The mass ratio of rapid one obtained protein solution is 0~0.2:1；The requirement of the deionized water titration are as follows: obtained in step 1
Protein solution account for the 50vol% of precursor solution obtained after titration.
6. according to claim 1 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: in step 2, the power of the Ultrasonic Pulverization is the 10~20% of ultrasonic cell disrupte machine power, when
Between be 3~5min.
7. according to claim 1 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: in step 3, the temperature of the heating water bath is 80 DEG C, and the time is 1~2h.
8. according to claim 1 a kind of using egg white as the preparation of the biomass porous carbon electromagnetic-wave absorbent of presoma
Method, it is characterised in that: in step 5, the actual conditions of the carbonization are as follows: be first carbonized at 240~320 DEG C, be carbonized in advance in advance
Heating rate in the process is 2 DEG C/min, then the carbonization treatment 2h at 600~800 DEG C.
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| CN111151283A (en) * | 2020-01-15 | 2020-05-15 | 中南大学 | Nitrogen-cobalt co-doped porous carbon loaded sulfur-zinc-cobalt catalytic material and preparation method and application thereof |
| CN112830469A (en) * | 2020-12-31 | 2021-05-25 | 西安理工大学 | Preparation method of biomass carbon quantum dot compounded porous carbon electrode material |
| CN113104903A (en) * | 2021-03-01 | 2021-07-13 | 西安理工大学 | Preparation method of biomass-based wave-absorbing material |
| CN115322423A (en) * | 2022-08-29 | 2022-11-11 | 西安工业大学 | Egg white thin film and preparation method of degradable organic-inorganic thin film transistor |
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