CN115138304A - MOF (Metal organic framework) derived composite aerogel as well as preparation method and application thereof - Google Patents
MOF (Metal organic framework) derived composite aerogel as well as preparation method and application thereof Download PDFInfo
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- 239000004964 aerogel Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000012621 metal-organic framework Substances 0.000 title abstract description 21
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002243 precursor Substances 0.000 claims abstract description 17
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 238000001354 calcination Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000004108 freeze drying Methods 0.000 claims abstract description 10
- 239000013110 organic ligand Substances 0.000 claims abstract description 10
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- 239000002904 solvent Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 230000035484 reaction time Effects 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000003837 high-temperature calcination Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229940044631 ferric chloride hexahydrate Drugs 0.000 claims description 4
- NQXWGWZJXJUMQB-UHFFFAOYSA-K iron trichloride hexahydrate Chemical group O.O.O.O.O.O.[Cl-].Cl[Fe+]Cl NQXWGWZJXJUMQB-UHFFFAOYSA-K 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 150000002505 iron Chemical class 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000011049 filling Methods 0.000 abstract description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 12
- 239000011358 absorbing material Substances 0.000 description 9
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 8
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/0091—Preparation of aerogels, e.g. xerogels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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Abstract
The invention discloses a composite aerogel derived from MOF (Metal organic framework), a preparation method and application thereof, wherein the preparation method comprises the following steps: carrying out solvothermal reaction on ferric salt, a surfactant and an organic ligand to prepare an MIL101 precursor; uniformly mixing the precursor and graphene oxide in a solvent, freeze-drying, and calcining at high temperature to obtain gamma-Fe 2 O 3 @ C/rGO composite aerogels; the calcining temperature is 400-800 ℃, the heating rate is 1-5 ℃/min, and the reaction time is 0.5-4h. The material has the characteristics of strong reflection loss, low filling amount, wide frequency band and light weight, has good impedance matching performance and strong electromagnetic wave loss capacity when being used for electromagnetic wave absorption, and has strong wave absorption performance under the condition of low filling amount.
Description
Technical Field
The invention belongs to the technical field of electromagnetic wave absorption materials, and particularly relates to an MOF (metal organic framework) derived composite aerogel material, a preparation method thereof and application thereof in an electromagnetic wave absorption direction.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The popularization of electronic devices and wireless communication devices has made people's lives more convenient, but the residual electromagnetic waves in the environment not only pollute the environment but also are harmful to human health, and the most effective way to solve this problem is to convert the unwanted electromagnetic waves in the environment into heat energy or other types of energy through electromagnetic wave absorbing materials.
In recent years, magnetic metal ions in a metal organic framework MOF structure are reduced into magnetic metal in situ in the carbonization process, and the impedance matching and absorption performance of the absorption material are optimized through the synergistic effect of the magnetic metal ions and carbonized graphite carbon. In addition, the metal atoms are embedded in the carbon matrix, which is advantageous for preventing corrosion of the metal atoms. However, the carbon-based microwave absorbing material derived from the magnetic MOF has the disadvantages of easy agglomeration, large filling amount, narrow effective absorption bandwidth and the like, and further practical production and application of the material are limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide MOF-derived gamma-Fe 2 O 3 @ C/rGO composite aerogel and a preparation method and application thereof. The material has the characteristics of strong reflection loss, low filling amount, wide frequency band and light weight, and when being used for electromagnetic wave absorption, meanwhile, the composite material has good impedance matching performance and strong electromagnetic wave loss capability, and has strong wave absorbing performance under low filling amount.
In order to realize the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a MOF-derived gamma-Fe 2 O 3 The preparation method of the @ C/rGO composite aerogel material comprises the following steps:
carrying out solvothermal reaction on ferric salt, a surfactant and an organic ligand to prepare an MIL101 precursor;
uniformly mixing the precursor and graphene oxide in a solvent, freeze-drying, and calcining at high temperature to obtain gamma-Fe 2 O 3 @ C/rGO composite aerogels;
the calcining temperature is 400-800 ℃, the heating rate is 1-5 ℃/min, and the reaction time is 0.5-4h.
In a second aspect, the invention provides a MOF-derived γ -Fe 2 O 3 The @ C/rGO composite aerogel material is prepared by the preparation method.
In a third aspect, the invention provides said MOF-derived γ -Fe 2 O 3 The application of the @ C/rGO composite aerogel material in the preparation of electromagnetic wave absorption devices.
The beneficial effects achieved by one or more of the embodiments of the invention described above are as follows:
(1) The gamma-Fe prepared by the invention 2 O 3 @ C/rGO composite aerogels, in one aspect, gamma-Fe 2 O 3 The core-shell structure of @ C and the porous structure formed by the three-dimensional graphene skeleton can optimize the impedance matching of the material, so that electromagnetic waves can smoothly enter the material without reflection; on the other hand, gamma-Fe 2 O 3 The wave absorber is a magnetic material, has magnetic loss on electromagnetic waves entering the wave absorber, has dielectric loss on the electromagnetic waves by the graphene and the graphite carbon, and has better loss capacity by the coordination of multiple loss mechanisms; in a third aspect, the existence of the porous structure not only can optimize the impedance matching of the material, but also can enable the electromagnetic wave to generate multiple scattering, and the loss of the material to the electromagnetic wave is enhanced.
(2) Compared with the prior art, the gamma-Fe prepared by the invention 2 O 3 Gamma-Fe in @ C/rGO composite aerogel 2 O 3 The @ C is uniform in size and is uniformly dispersed in pores and pore walls of the aerogel formed by the three-dimensional rGO, and the introduction of the rGO well overcomes the defects of aggregation and large filling amount of the MOF derivative wave absorbing agent.
(3) Mixing gamma-Fe 2 O 3 The absorbing material is obtained by compounding the @ C/rGO composite aerogel with the binder, the reflection loss of electromagnetic waves at the frequency of 11.44GHz reaches-77.43 dB, the matching thickness is only 3.29mm, and the optimal effective absorption bandwidth reaches 6.02GHz. gamma-Fe 2 O 3 The @ C/rGO composite aerogel has certain wave-absorbing performance and wide applicationAnd (4) value.
(4) The material prepared by the invention has good wave absorbing effect, so that the material is expected to be widely applied to the preparation of electromagnetic wave absorbing materials.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is gamma-Fe prepared in example 1 2 O 3 The XRD pattern of the @ C/rGO composite aerogel.
FIG. 2, wherein a is SEM picture of MIL101 precursor prepared in step (1) of example 1, and b and c are γ -Fe obtained in the end of example 1 2 O 3 SEM picture of @ C/rGO composite aerogel.
FIG. 3 shows γ -Fe obtained in example 1 2 O 3 TEM image of @ C/rGO composite aerogel.
FIG. 4, panel a is gamma-Fe prepared in example 1 2 O 3 The real part of the dielectric constant of the @ C/rGO composite aerogel, the b diagram is the imaginary part of the dielectric constant, and the C diagram is the dielectric loss tangent.
FIG. 5, panel a shows γ -Fe prepared in example 1 2 O 3 The magnetic conductivity real part of the @ C/rGO composite aerogel, the b diagram is a magnetic conductivity imaginary part, and the C diagram is magnetic loss tangent.
FIG. 6 shows gamma-Fe prepared in the experimental example 2 O 3 Reflection loss plot for @ C/rGO composite aerogel absorbers.
Fig. 7 is a graph of the reflection loss of the solid prepared in comparative example 1.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In a first aspect, the present invention provides a MOF-derived γ -Fe 2 O 3 The preparation method of the @ C/rGO composite aerogel material comprises the following stepsThe method comprises the following steps:
carrying out solvothermal reaction on ferric salt, a surfactant and an organic ligand to prepare an MIL101 precursor;
uniformly mixing the precursor and graphene oxide in a solvent, freeze-drying, and calcining at high temperature to obtain gamma-Fe 2 O 3 @ C/rGO composite aerogels;
the calcining temperature is 400-800 ℃, the heating rate is 1-5 ℃/min, and the reaction time is 0.5-4h.
The gamma-Fe 2 O 3 The @ C/rGO composite aerogel contains Fe, C and O elements, wherein the Fe element and the O element are gamma-Fe 2 O 3 Is mainly in the form of three-dimensional graphene and graphitic carbon, the gamma-Fe 2 O 3 The @ C/rGO composite aerogel has a core-shell structure, namely gamma-Fe 2 O 3 Embedded in the carbonized carbon skeleton of MIL101 to form C shell gamma-Fe 2 O 3 Core-shell structure of the core.
Compared with the prior art, the gamma-Fe prepared by the invention 2 O 3 Gamma-Fe in @ C/rGO composite aerogel 2 O 3 The @ C is uniform in size and is uniformly dispersed in the holes and the hole walls of the aerogel formed by the three-dimensional rGO, and the defect of aggregation of the MOF derivatives is effectively overcome by introducing the rGO.
In some embodiments, the iron salt is ferric chloride hexahydrate.
In some embodiments, the surfactant is polyvinylpyrrolidone.
In some embodiments, the organic ligand is terephthalic acid.
In some embodiments, the mass ratio of the iron salt, the organic ligand, the surfactant, and the solvent is 0.2-1; preferably 0.5-1.
In some embodiments, the solvothermal reaction temperature is 90-120 ℃; for example, the temperature can be 90 deg.C, 91 deg.C, 92 deg.C, 93 deg.C, 94 deg.C, 95 deg.C, 96 deg.C, 97 deg.C, 98 deg.C, 99 deg.C, 101 deg.C, 102 deg.C, 103 deg.C, 104 deg.C, 105 deg.C, 106 deg.C, 107 deg.C, 108 deg.C, 109 deg.C, 110 deg.C, 111 deg.C, 112 deg.C, 113 deg.C, 114 deg.C, 115 deg.C, 116 deg.C, 117 deg.C, 118 deg.C, 119 deg.C, and 120 deg.C.
Preferably, the reaction temperature is 100-120 ℃;
it is further preferred that the solvothermal reaction temperature is from 108 to 112 ℃.
In the process of solvothermal reaction, metal ions and organic ligands construct a metal-organic framework MIL101 with a space cone structure through self-assembly under the action of a surfactant. The above addition ratio and temperature range contribute to the formation of the MIL101 precursor.
In some embodiments, the mass ratio of the precursor, graphene oxide and water is 0.01-0.05; preferably 0.01-0.03.
Preferably, the freeze drying is performed by placing the mixed solution in liquid nitrogen and performing freeze drying in a one-way freezing manner.
Further preferably, the freeze-drying time is 24-72h; preferably, the drying time is 36 to 60 hours, more preferably 45 to 50 hours.
For example, the freeze-drying time may be 24h, 25h, 26h, 27h, 28h, 29h, 30h, 31h, 32h, 33h, 34h, 35h, 36h, 37h, 38h, 39h, 40h, 41h, 42h, 43h, 44h, 45h, 46h, 47h, 48h, 49h, 50h, 51h, 52h, 53h, 54h, 55h, 56h, 57h, 58h, 59h, 60h, 61h, 62h, 63h, 64h, 65h, 66h, 67h, 68h, 69h, 70h, 71h, 72h.
In some embodiments, the high temperature calcination is at a temperature of 400-700 deg.C for 1-3h at a rate of 1-3 deg.C/min.
Specifically, the high temperature calcination temperature includes, but is not limited to, 400 deg.C, 410 deg.C, 420 deg.C, 430 deg.C, 440 deg.C, 450 deg.C, 460 deg.C, 470 deg.C, 480 deg.C, 490 deg.C, 500 deg.C, 510 deg.C, 520 deg.C, 530 deg.C, 540 deg.C, 550 deg.C, 560 deg.C, 570 deg.C, 580 deg.C, 590 deg.C, 600 deg.C, 610 deg.C, 620 deg.C, 630 deg.C, 640 deg.C, 650 deg.C, 660 deg.C, 680 deg.C, 690 deg.C, 700 deg.C;
calcination times include, but are not limited to, 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h, 2h, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h, 2.6h, 2.7h, 2.8h, 2.9h, 3h;
the rate of temperature rise includes, but is not limited to, 1 deg.C/min, 1.1 deg.C/min, 1.2 deg.C/min, 1.3 deg.C/min, 1.4 deg.C/min, 1.5 deg.C/min, 1.6 deg.C/min, 1.7 deg.C/min, 1.8 deg.C/min, 1.9 deg.C/min, 2 deg.C/min, 2.1 deg.C/min, 2.2 deg.C/min, 2.3 deg.C/min, 2.4 deg.C/min, 2.5 deg.C/min, 2.6 deg.C/min, 2.7 deg.C/min, 2.8 deg.C/min, 2.9 deg.C/min, 3 deg.C/min.
In the high-temperature calcination process, the organic ligand in the MIL101 is carbonized, and metal ions form gamma-Fe 2 O 3 GO is reduced to rGO.
In a second aspect, the invention provides a MOF-derived gamma-Fe 2 O 3 The @ C/rGO composite aerogel material is prepared by the preparation method.
In a third aspect, the invention provides said MOF-derived γ -Fe 2 O 3 Application of the @ C/rGO composite aerogel material in preparation of electromagnetic wave absorption devices.
γ-Fe 2 O 3 Uniformly mixing the @ C/rGO composite aerogel and the binder according to the mass ratio of 3 2 O 3 Gamma-Fe in @ C/rGO composite aerogel composite wave-absorbing material 2 O 3 The @ C/rGO composite aerogel and binder form a substantially uniformly distributed form. The mixing at 30-60 deg.C has the effects of enhancing fluidity of the binder and facilitating the mixing of the binder and gamma-Fe 2 O 3 And uniformly mixing the @ C/rGO composite aerogel. The mixing means includes stirring and the like.
The present invention will be further described with reference to the following examples.
Example 1
(1) Dissolving 1.54g of ferric chloride hexahydrate, 0.17g of terephthalic acid and 0.15g of polyvinylpyrrolidone in 15mL of N, N-dimethylformamide solution, carrying out ultrasonic treatment for 15min to obtain a uniform solution, adding the uniform solution, transferring the uniform solution into a 20ml hydrothermal kettle, reacting at 110 ℃ for 20h, cooling to room temperature, carrying out centrifugal separation on the product, washing with N, N-dimethylformamide and ethanol for three times, and drying at 70 ℃ overnight to obtain an MIL101 precursor.
(2) An aqueous dispersion of GO was prepared.
(3) Dissolving 0.02g of MIL101 precursor obtained in the step (1) and 0.05g of GO in 9.93g of water, performing ultrasonic treatment for 15min, and shaking for 2min to obtain uniform liquid. Freezing in liquid nitrogen in one direction, and drying in a freeze dryer for 48h to obtain MIL101/rGO composite aerogel
(4) Calcining the MIL101/rGO composite aerogel obtained in the step (3) at the temperature rise rate of 2 ℃/min for 2h at 700 ℃ in an argon atmosphere to obtain gamma-Fe 2 O 3 @ C/rGO composite aerogel.
FIG. 1 shows γ -Fe prepared in example 1 2 O 3 XRD pattern of @ C/rGO composite aerogel, and gamma-Fe is determined to be prepared 2 O 3 @C/rGO。
FIG. 2, panel a, is an SEM image of the MIL101 precursor prepared in step (1) of example 1, with an average diameter of about 1 μm and smooth surface; panels b and c are the final γ -Fe obtained in example 1 2 O 3 SEM image of @ C/rGO composite aerogel, gamma-Fe 2 O 3 The @ C is uniformly dispersed in the three-dimensional pore wall and the pores formed by the graphene sheets.
FIG. 3 is γ -Fe prepared in example 1 2 O 3 TEM image of @ C/rGO composite aerogel, from FIGS. 3 (a) and (b), it can be seen that the octahedral structure of MIL101 is substantially maintained after high temperature calcination, and from FIG. 3 (C), it can be seen that γ -Fe 2 O 3 The particles are uniformly embedded in the skeleton after the MIL101 carbonization, and FIG. 3 (d) further proves that the gamma-Fe 2 O 3 The successful preparation.
Example 2
(1) Dissolving 1.54g of ferric chloride hexahydrate, 0.17g of terephthalic acid and 0.15g of polyvinylpyrrolidone in 15mL of N, N-dimethylformamide solution, carrying out ultrasonic treatment for 15min to obtain a uniform solution, adding the uniform solution, transferring the uniform solution into a 20ml hydrothermal kettle, reacting at 110 ℃ for 20h, cooling to room temperature, carrying out centrifugal separation on the product, washing with N, N-dimethylformamide and ethanol for three times, and drying at 70 ℃ overnight to obtain an MIL101 precursor.
(2) Calcining the MIL101 precursor obtained in the step (1) at the temperature rise rate of 2 ℃/min at 700 ℃ for 2h in an argon atmosphere to obtain gamma-Fe 2 O 3 @ C black powder.
Examples of the experiments
Example 1. Gamma. -Fe 2 O 3 Mixing the @ C/rGO composite aerogel with paraffin to obtain gamma-Fe 2 O 3 The @ C/rGO composite aerogel composite wave-absorbing material is subjected to electromagnetic parameter testing by using an Agilent Technologies E8363A electromagnetic wave vector network analyzer, and the wave-absorbing performance of the material is calculated according to the electromagnetic parameters, so that the result shown in figure 6 is obtained.
As can be seen in FIG. 4, gamma-Fe 2 O 3 The @ C/rGO composite aerogel composite wave-absorbing material has stronger dielectric loss.
As can be seen in FIG. 5, γ -Fe 2 O 3 The @ C/rGO composite aerogel composite wave-absorbing material has weaker magnetic loss.
As can be seen from FIG. 6, γ -Fe 2 O 3 The @ C/rGO composite aerogel wave-absorbing material has excellent electromagnetic wave absorption performance. The reflection loss of the electromagnetic wave at the frequency of 11.44GHz reaches-77.43 dB, and the matching thickness is only 3.29mm.
Comparative example 1
The difference from example 1 is that the MIL101 derivative (gamma-Fe) is a single component only 2 O 3 @ C), does not complex with rGO to form gamma-Fe 2 O 3 @ C/rGO composite aerogels. And performing electromagnetic parameter test by using an Agilent Technologies E8363A electromagnetic wave vector network analyzer, and calculating the wave absorbing performance of the material according to the electromagnetic parameters.
FIG. 7 is a graph showing the properties of the sample prepared in comparative example 1, and it can be seen that there is almost no wave-absorbing property in the range of 2-18GHz and the optimum reflection loss value in the entire frequency range does not exceed-10 dB. The reflection loss is far inferior to that of the embodiment 1, and the wave absorbing performance is extremely poor.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. MOF-derived gamma-Fe 2 O 3 @ C/rGO composite aerogelThe preparation method of the material is characterized by comprising the following steps: the method comprises the following steps:
carrying out solvothermal reaction on ferric salt, a surfactant and an organic ligand to prepare an MIL101 precursor;
uniformly mixing the precursor and graphene oxide in a solvent, freeze-drying, and calcining at high temperature to obtain gamma-Fe 2 O 3 @ C/rGO composite aerogels;
the calcining temperature is 400-800 ℃, the heating rate is 1-5 ℃/min, and the reaction time is 0.5-4h.
2. The MOF-derived γ -Fe of claim 1 2 O 3 The preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps of: the ferric salt is ferric chloride hexahydrate;
the surfactant is polyvinylpyrrolidone;
the organic ligand is terephthalic acid.
3. The MOF-derived γ -Fe of claim 1 2 O 3 The preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps of: the mass ratio of the iron salt, the organic ligand, the surfactant and the solvent is 0.2-1.
4. The MOF-derived γ -Fe of claim 1 2 O 3 A preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps: the reaction temperature of the solvothermal reaction is 90-120 ℃.
5. The MOF-derived γ -Fe of claim 1 2 O 3 The preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps of: the reaction temperature of the solvothermal reaction is 108-112 ℃.
6. The MOF-derived γ -Fe of claim 1 2 O 3 The preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps of: the mass ratio of the precursor to the graphene oxide to the water is 0.01-0.05.
7. The MOF-derived γ -Fe of claim 1 2 O 3 The preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps of: the freeze drying is to put the mixed solution into liquid nitrogen and carry out freeze drying in a one-way freezing way.
8. The MOF-derived γ -Fe of claim 1 2 O 3 The preparation method of the @ C/rGO composite aerogel material is characterized by comprising the following steps of: the high-temperature calcination is carried out at the temperature of 400-700 ℃ for 1-3h, and the heating rate is 1-3 ℃/min.
9. MOF-derived gamma-Fe 2 O 3 The @ C/rGO composite aerogel material is characterized in that: prepared by the preparation method of any one of claims 1 to 8.
10. The MOF-derived γ -Fe of claim 9 2 O 3 The application of the @ C/rGO composite aerogel material in the preparation of electromagnetic wave absorption devices.
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