CN108997971B - Preparation method of ZIF-67 reduced graphene oxide-based wave-absorbing composite material CoC-rGo - Google Patents
Preparation method of ZIF-67 reduced graphene oxide-based wave-absorbing composite material CoC-rGo Download PDFInfo
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Abstract
A preparation method of a ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo belongs to the technical field of wave-absorbing composite materials. Firstly, synthesizing graphene oxide by a hummers method, and forming ZIF-67 between graphene oxide layers; secondly, synthesizing a ZIF-67 graphene oxide precursor; and finally, carrying out high-temperature calcination post-treatment on the composite material to prepare the ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo. The preparation method is simple in preparation process, universal (both FeC and NiC are suitable for the method), and suitable for large-scale production; and the material density is relatively small, the product performance is excellent, and the wave-absorbing performance is excellent.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing composite materials, and relates to a preparation method of a ZIF-67 reduced graphene oxide-based wave-absorbing composite material CoC-rGo.
Background
At present, an electromagnetic wave absorbing material is the core of a radar stealth technology and has important strategic value in the fields of aerospace, national defense and military industry, so that how to prepare a wave absorbing composite material with light weight, thin surface, wide absorption frequency band and high absorption strength is a challenging research subject at present.
The graphene is a novel two-dimensional ultrathin material and is formed by tightly stacking single-layer carbon atoms, and the carbon atoms in the graphene are sp2The hybrid orbit is arranged, has the advantages of higher specific surface area, aspect ratio, thermal conductivity, electric conductivity, extremely high mechanical strength and the like, and is expected to have wide application prospect in the field of electromagnetic wave absorption.
The metal organic framework Materials (MOFs) are prepared by co-reacting metal ions and organic ligandsThe crystal material is formed by valence bond or ion-covalent bond self-assembly complexation and has a periodic network structure. The cobalt salt imidazolate framework material (ZIF-67) is made of Co2+The rhombic dodecahedron crystal formed by coordination with 2-methylimidazole is a novel MOFs material, has good thermal stability, has the advantages of simple preparation process, suitability for batch production, large specific surface area, high porosity and the like, and is commonly used for preparing high-efficiency catalysts. The most outstanding advantage of ZIF-67 is that metal Co with magnetism can be obtained after high-temperature treatment, and a lightweight and porous carbon skeleton structure can be formed.
The microwave absorption mechanism of the graphene material mainly passes through dielectric loss, but the single graphene material has a high dielectric constant and a low magnetic permeability, so that impedance matching is poor, and the wave absorption performance of the graphene material is affected. ZIF-67 has a magnetic metal and a porous carbon skeleton after high-temperature calcination, but the degree of crystallization of carbon is low, resulting in a low dielectric constant and poor impedance matching. At present, graphene and ZIF-67 are combined to be used in the field of electromagnetic wave absorption, and reports are not found yet, and the method utilizes respective performance advantages of graphene and ZIF-67 and utilizes carboxyl in graphene oxide and metal Co2+The ZIF-67 and the graphene oxide are combined to be used as a precursor, and the CoC-rGo wave-absorbing composite material is prepared by high-temperature calcination, and test results show that the wave-absorbing performance of the composite material is excellent. The preparation method is simple in process, environment-friendly, universal and suitable for large-scale industrial production.
Disclosure of Invention
The invention aims to provide a preparation method of a novel wave-absorbing material, which has simple synthesis process, is green and environment-friendly and is suitable for large-scale production; meanwhile, the electromagnetic parameters of the CoC-rGo wave-absorbing composite material can be regulated and controlled by regulating and controlling the proportion of the ZIF-67 to the graphene raw material, so that the finally obtained composite material has excellent wave-absorbing performance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo. Firstly, synthesizing graphene oxide, adsorbing cobalt ions on the surface of the graphene oxide by utilizing the electrostatic interaction between carboxyl on the surface of the graphene oxide and metal cobalt ions in ZIF-67, and forming ZIF-67 on the surface of the graphene by utilizing the coordination effect of the cobalt ions and 2-methylimidazole; and then, calcining at high temperature to reduce the cobalt into simple-substance magnetic particles, and reducing the graphene oxide into reduced graphene oxide to form the CoC-rGo wave-absorbing composite material. SEM research results show that ZIF-67 is uniformly distributed among graphene oxide layers, and the particle size is about 2 m. The method specifically comprises the following steps:
1) preparing graphite oxide by using a Hummers method, performing ultrasonic treatment to obtain a graphene oxide solution, and drying to obtain graphene oxide powder. The prepared graphene oxide can be further processed by an ultrasonic cell crusher and freeze-dried, and is beneficial to adsorption of metal ions.
2) Adding graphene oxide powder and cobalt salt into absolute ethyl alcohol at room temperature, performing ultrasonic dispersion for 30-240 min, centrifuging, washing and then performing vacuum drying to obtain an intermediate Co2+-Go. The cobalt salt comprises cobalt nitrate, cobalt chloride or cobalt sulfate; the mass ratio of the cobalt salt to the graphene oxide is 1-6: 1.
3) At room temperature, adding Co2+Adding Go, cobalt salt and dimethyl imidazole into anhydrous methanol, mechanically stirring for 1-6h, standing for 24h, performing suction filtration, and performing vacuum drying to obtain an intermediate ZIF-67-Go. The molar ratio of the cobalt salt to the 2-methylimidazole is 1: 1-3; cobalt salt and Co2+The mass ratio of-Go is 4: 1.5-0.25.
4) And placing the intermediate ZIF-67-Go into a ceramic square boat, placing the ceramic square boat into a tube furnace, and calcining at the temperature of 500-. The inert gas comprises nitrogen or argon.
The invention has the beneficial effects that: from the synthesis process, Co is mixed2+Adsorbing the zinc oxide particles between graphene oxide layers, inlaying ZIF-67 between the graphene oxide layers through coordination with an organic ligand, calcining the graphene oxide layers, and calcining the graphene oxide layers to obtain the Co-doped graphene oxide2+And reducing the graphene to obtain the composite wave-absorbing particle CoC-rGo with excellent wave-absorbing performance. The scanning electron microscope and the X-ray diffraction show that,the CoC-rGo can be obtained by the method, and the excellent wave-absorbing performance can be proved by a network vector analyzer and matlab simulation, so that the thin, light and wide performance requirements are met. The ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo prepared by the method is expected to be applied to the fields of stealth aircrafts and the like. The preparation method is simple in preparation process, excellent in product performance, universal (both FeC and NiC are suitable for the method), and suitable for large-scale production.
Drawings
FIG. 1 is a scanning electron micrograph of a sample of example 1: a) ZIF-67-Go; b) CoC-rGo;
FIG. 2 is an X-ray diffraction pattern of the sample of example 1: a) go; b) ZIF-67-Go;
FIG. 3 is an X-ray diffraction pattern of the sample of example 1: a) ZIF-67-1; b) CoC-rGo;
FIG. 4 is a reflection loss curve of sample CoC-rGo of example 1.
Detailed Description
The invention is further illustrated by the following examples, which are given by way of illustration only and are not intended to limit the scope of the invention.
Example 1:
(one) 90mL of concentrated H2SO415mL of concentrated HNO33g of graphite was placed in a 500mL three-necked flask, mechanically stirred in an ice-water bath for 0.5 hour, and then 12g of KMnO was added thereto4Gradually adding into the above solution, mechanically stirring for 1 hr, and transferring to 35 deg.C water bath for 3 hr. Slowly dropwise adding 100mL of distilled water into the reactant, reacting at 90 ℃ for 0.5H, and adding 25mL of H in batches when the temperature is reduced to about 60 DEG C2O2And 200mL of distilled water. Washing the product with dilute hydrochloric acid, and freeze-drying to obtain graphene oxide powder (Go).
(II) weighing 0.5g Go and 1g Co (NO)3)2·6H2O, ultrasonic dispersing in absolute ethyl alcohol for 30min, centrifugal washing and vacuum drying. Obtaining intermediate Co2+-Go。
(III) adding 0.5g of Co2+-Go with 4g Co (NO)3)2·6H2O, 2.8g dimethylimidazole (cobalt salt with 2-methylimidazole mol.)The ratio is 1:2.5), adding into anhydrous methanol, mechanically stirring for 4h, standing for 24h, performing suction filtration, and performing vacuum drying to obtain ZIF-67-Go.
And (IV) putting the ZIF-67-Go into a ceramic ark, putting the ark into a tube furnace, calcining the ark in an argon atmosphere at the heating rate of 5 ℃/min for 300min at the temperature of 800 ℃, and thus obtaining the CoC-rGo.
The detection results are as follows:
FIG. 1 is a scanning electron micrograph of example 1, and from FIG. a, it can be seen that the dodecahedral ZIF-67 structure is attached between graphene oxide lamellae, fully illustrating the formation of the complex ZIF-67-Go. While the graph b shows the CoC-rGo obtained after calcination, it can be seen that the shape of the dodecahedron still exists, which indicates that the morphology of the particles is not changed after calcination.
FIG. 2a) Go; b) ZIF-67-Go, fig. 3a) ZIF-67; b) from the figure, it can be seen that the doping of ZIF-67 is that the characteristic diffraction peak of graphene oxide is obviously reduced, which indicates that graphene oxide and Co are mixed2+ZIF-67-Go is subjected to electrostatic interaction, and Co diffraction peaks appear in calcined CoC-rGo.
FIG. 4 is a graph of the reflection loss of CoC-rGo sample of example 1, which is a concentric ring material made of composite material and paraffin wax in a ratio of 1:9, and it can be seen that the reflection loss is-36.2 dB and the effective absorption bandwidth is 5.27GHz at a thickness of 1.8 mm. The performance requirements of thinness, lightness, width and strength are met.
Example 2:
the same as example 1.
(II) weighing 6g Go and 1g Co (NO)3)2·6H2And O, ultrasonically dispersing in a certain amount of absolute ethyl alcohol for 60min, centrifugally washing, and drying in vacuum. Obtaining intermediate Co2+-Go。
(III) 1g of Co2+-Go with 4g Co (NO)3)2·6H2O and 2.8g of dimethyl imidazole (the molar ratio of cobalt salt to 2-methylimidazole is 1:2.5) are added into anhydrous methanol together, the mixture is mechanically stirred for 6 hours, kept stand for 24 hours, filtered by suction and dried in vacuum to obtain ZIF-67-Go.
And (IV) putting the ZIF-67-Go into a ceramic ark, putting the ark into a tube furnace, calcining the ark in a nitrogen atmosphere at the heating rate of 5 ℃/min for 200min at the temperature of 1000 ℃, and thus obtaining the CoC-rGo.
Example 3:
the same as example 1.
(II) weighing 0.5g Go and 1g Co (NO)3)2·6H2And O, ultrasonically dispersing in a certain amount of absolute ethyl alcohol for 30min, centrifugally washing, and drying in vacuum. Obtaining intermediate Co2+-Go。
(III) adding 0.5g of Co2+-Go with 4g Co (NO)3)2·6H2O and 2.8g) dimethylimidazole (the molar ratio of cobalt salt to 2-methylimidazole is 1:2.5) are added into anhydrous methanol together, the mixture is mechanically stirred for 2 hours, the mixture is kept stand for 24 hours, and vacuum drying is carried out after suction filtration to obtain ZIF-67-Go.
And (IV) putting the ZIF-67-Go into a ceramic ark, putting the ark into a tube furnace, calcining the ark in a nitrogen atmosphere at the heating rate of 5 ℃/min for 400min at the temperature of 500 ℃, and thus obtaining the CoC-rGo.
Example 4:
the same as example 1.
(II) 0.5g Go, 1.5g Co (NO) are weighed3)2·6H2And O, ultrasonically dispersing in a certain amount of absolute ethyl alcohol for 30min, centrifugally washing, and drying in vacuum. Obtaining intermediate Co2+-Go。
(III) adding 0.25g of Co2+-Go with 4g Co (NO)3)2·6H2O and 2.8g of dimethyl imidazole (the molar ratio of cobalt salt to 2-methylimidazole is 1:2.5) are added into anhydrous methanol together, the mixture is mechanically stirred for 1 hour, kept stand for 24 hours, filtered, and dried in vacuum to obtain ZIF-67-Go.
And (IV) putting the ZIF-67-Go into a ceramic ark, putting the ark into a tube furnace, calcining in an argon atmosphere at the heating rate of 5 ℃/min and at the temperature of 600 ℃ for 400min to obtain the CoC-rGo.
Example 5:
the same as example 1.
(II) weighing 4g Go and 12g Co (NO)3)2·6H2Dispersing in certain amount of anhydrous ethanol for 30min by ultrasonic wave, centrifuging, washing, and vacuum drying. Is obtained inIntermediate Co2+-Go。
(III) adding 3.75g of Co2+-Go with 10g Co (NO)3)2·6H2O and 2.8g of dimethyl imidazole (the molar ratio of cobalt salt to 2-methylimidazole is 1:1) are added into anhydrous methanol together, the mixture is mechanically stirred for 4 hours, the mixture is kept stand for 24 hours, and vacuum drying is carried out after suction filtration to obtain ZIF-67-Go.
And (IV) putting ZIF-67-Go into a ceramic ark, putting the ark into a tube furnace, calcining in an argon atmosphere at the heating rate of 5 ℃/min and at the temperature of 600 ℃ for 240min to obtain the CoC-rGo.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.
Claims (10)
1. A preparation method of a ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo is characterized by comprising the steps of firstly, synthesizing graphene oxide, adsorbing cobalt ions on the surface of the graphene oxide by utilizing the electrostatic interaction between carboxyl on the surface of the graphene oxide and metal cobalt ions in ZIF-67, and forming ZIF-67 on the surface of the graphene by utilizing the coordination effect of the cobalt ions and 2-methylimidazole; then, high-temperature calcination is adopted, the cobalt simple substance magnetic particles are reduced, and the reduced graphene oxide is reduced to the reduced graphene oxide, so that the CoC-rGo wave-absorbing composite material is formed; the method specifically comprises the following steps:
1) preparing graphite oxide by using a Hummers method, performing ultrasonic treatment to obtain a graphene oxide solution, and drying to obtain graphene oxide powder;
2) adding graphene oxide powder and cobalt salt into absolute ethyl alcohol at room temperature, performing ultrasonic dispersion, centrifugally washing, and then performing vacuum drying to obtain an intermediate Co2+-Go; the mass ratio of the cobalt salt to the graphene oxide is 1-6: 1;
3) at room temperature, adding Co2+Adding Go, cobalt salt and dimethyl imidazole into anhydrous methanol, mechanically stirring for 1-6h, standing, filtering,Vacuum drying to obtain intermediate ZIF-67-Go; the molar ratio of the cobalt salt to the 2-methylimidazole is 1: 1-3; cobalt salt and Co2+-Go in a mass ratio of 4: 1.5-0.25;
4) and placing the intermediate ZIF-67-Go into a ceramic square boat, placing the ceramic square boat into a tube furnace, and calcining at the temperature of 500-.
2. The preparation method of the ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo according to claim 1, wherein the graphene oxide prepared in step 1) can be further processed by an ultrasonic cell crusher and freeze-dried, which is helpful for adsorption of metal ions.
3. The preparation method of the ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo according to claim 1 or 2, wherein the cobalt salt in step 2) comprises cobalt nitrate, cobalt chloride or cobalt sulfate.
4. The preparation method of the ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo according to claim 1 or 2, wherein the ultrasonic dispersion time in step 2) is 30-240 min.
5. The preparation method of the ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo according to claim 3, wherein the ultrasonic dispersion time in step 2) is 30-240 min.
6. The preparation method of the ZIF-67 reduced graphene oxide based wave-absorbing composite material CoC-rGo according to claim 1, 2 or 5, wherein the standing time in step 3) is 24 hours.
7. The preparation method of the ZIF-67 reduced graphene oxide based microwave absorbing composite CoC-rGo according to claim 3, wherein the standing time in step 3) is 24 hours.
8. The preparation method of the ZIF-67 reduced graphene oxide based microwave absorbing composite CoC-rGo according to claim 4, wherein the standing time in step 3) is 24 hours.
9. The preparation method of the ZIF-67 reduced graphene oxide based microwave absorbing composite CoC-rGo according to claim 1, 2, 5, 7 or 8, wherein the inert gas in step 4) comprises nitrogen or argon.
10. The preparation method of the ZIF-67 reduced graphene oxide based microwave absorbing composite CoC-rGo, according to claim 6, wherein the inert gas of step 4) comprises nitrogen or argon.
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| CN109935812A (en) * | 2019-03-13 | 2019-06-25 | 河源广工大协同创新研究院 | A kind of novel lithium sulfur battery anode material and preparation method thereof |
| CN110127678B (en) * | 2019-05-20 | 2022-04-29 | 天津市职业大学 | Preparation method of magnetic graphene |
| CN112397690A (en) * | 2019-08-12 | 2021-02-23 | 中国科学院化学研究所 | Method for in-situ construction of surface coating layer based on metal-organic framework material |
| CN110982490B (en) * | 2019-12-26 | 2023-01-24 | 中原工学院 | Foam type cobalt/carbon composite wave-absorbing material and preparation method thereof |
| CN111944482A (en) * | 2020-08-17 | 2020-11-17 | 大连理工大学 | Preparation method of echinoid carbon nanotube-coated Co particle composite wave-absorbing material |
| CN115785565B (en) * | 2022-12-15 | 2023-06-13 | 南京大学 | Absorbing waveguide thermal gradient type microporous foam material and preparation method thereof |
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