CN109880591B - Porous carbon @ carbon nanotube wave-absorbing material and preparation method thereof - Google Patents
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Abstract
The invention provides a porous carbon @ carbon nanotube wave-absorbing material and a preparation method thereof, wherein the porous carbon @ carbon nanotube wave-absorbing material comprises the following steps: step 1, adding thiourea, sucrose and cobalt chloride hexahydrate into a saturated sodium chloride solution, and uniformly dispersing to obtain a mixed solution C; step 2, carrying out ultrasonic treatment on the mixed solution C, and then carrying out freeze drying to obtain a solid D; step 3, pyrolyzing the solid D at 590-610 ℃ in a protective atmosphere to obtain a solid E; step 4, grinding the solid E, adding water, performing ultrasonic treatment, filtering, collecting the solid, and performing vacuum drying to obtain a solid F; and 5, pyrolyzing the solid F at 890-910 ℃ in a protective atmosphere to obtain the porous carbon @ carbon nanotube wave-absorbing material. The porous carbon @ carbon nanotube wave-absorbing material prepared by the invention has an obvious porous structure, low filling amount and good wave-absorbing performance.
Description
Technical Field
The invention belongs to the field of material science, and relates to a porous carbon @ carbon nanotube wave-absorbing material and a preparation method thereof.
Background
With the development of electronic information technology and the popularization of electronic products, the electromagnetic wave can widely exist in daily life of people while meeting the living needs of people, and the problem of electromagnetic pollution is increasingly serious. In addition, in the military field, the rapid development of modern radio technology and radar detection systems greatly promotes the capability of searching and tracking targets in war, and the threat of traditional combat weapons is more and more serious. The use of wave-absorbing materials to attenuate these electromagnetic wave energies is an effective method. The ideal wave-absorbing material should have the advantages of thin thickness, wide absorption frequency band, light weight, strong absorption, good chemical stability and the like. However, although the conventional carbonaceous materials having a porous structure have strong electromagnetic wave absorption characteristics, the amount of the electromagnetic wave absorber filled in the matrix is large, which is not favorable for practical use.
Disclosure of Invention
The invention aims to provide a porous carbon @ carbon nanotube wave-absorbing material and a preparation method thereof.
The invention is realized by the following technical scheme:
a preparation method of a porous carbon @ carbon nanotube wave-absorbing material comprises the following steps:
step 1, adding thiourea, sucrose and cobalt chloride hexahydrate into a saturated sodium chloride solution, and uniformly dispersing to obtain a mixed solution C;
step 3, pyrolyzing the solid D at 590-610 ℃ in a protective atmosphere to obtain a solid E;
step 4, grinding the solid E, adding water, performing ultrasonic treatment, filtering, collecting the solid, and performing vacuum drying to obtain a solid F;
and 5, pyrolyzing the solid F at 890-910 ℃ in a protective atmosphere to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Preferably, step 1 specifically comprises: firstly, adding thiourea into a saturated sodium chloride solution, and dispersing to obtain a mixed solution A; then adding sucrose into the mixed solution A, and uniformly dispersing to obtain a mixed solution B; and adding cobalt chloride hexahydrate into the mixed solution B, and uniformly dispersing to obtain a mixed solution C.
Preferably, in the step 3, the pyrolysis time is 1.5-2.5 h.
Preferably, in the step 3, the temperature is raised to 590-610 ℃ at a speed of 1-3 ℃/min.
Preferably, in the step 5, the pyrolysis time is 1.5-2.5 h.
Preferably, in the step 5, the temperature is raised to 890-910 ℃ at 1-3 ℃/min.
Preferably, in the step 2, the power of the ultrasound is 600W, and the time of the ultrasound is 0.8-1.2 h; in the step 6, the power of the ultrasound is 600W, and the time of the ultrasound is 4-6 h.
Preferably, the ratio of thiourea to sucrose to the cobalt chloride hexahydrate to the saturated sodium chloride solution is (0.9-1.1) g: (0.9-1.1) g (0.03-0.12) g: 12 mL.
Preferably, in the step 4, the vacuum drying temperature is 75-85 ℃, and the vacuum drying time is 11-13 h.
The porous carbon @ carbon nanotube wave-absorbing material prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the method, sodium chloride is used as a template, sucrose and thiourea are pyrolyzed at 590-610 ℃, the temperature range is selected so as to ensure that the sodium chloride is not melted in the pyrolysis process, and then the sodium chloride template is removed to obtain a Co, N and S Co-doped porous carbon skeleton; then adopting an in-situ thermal carbonization method, and reacting Co doped in the porous carbon skeleton with S to obtain Co9S8In Co9S8Under the catalysis of the microwave absorbing material, carbon nanotubes grow in situ on a porous carbon skeleton at 890-910 ℃, and the porous carbon @ carbon nanotube microwave absorbing material is prepared. The preparation method has the advantages of better control of the conditions used in the preparation, low equipment operation requirement, simple process, low energy consumption, continuous operation and easy control. The porous carbon @ carbon nanotube wave-absorbing material prepared by the invention has a porous structure which can effectively reduce epsilonrThe loss characteristic is improved while the impedance matching characteristic is improved; meanwhile, the carbon nano tube has special electromagnetic performance and good wave absorbing effect, and has wide absorption frequency band and smaller density; co9S8As a magnetic particle, the magnetic particle has higher saturation magnetization, so that the material has stronger magnetic loss, and the improvement of impedance matching characteristics is facilitated, so that the wave-absorbing material has lower filling amount in a matrix, high dielectric loss and good wave-absorbing performance, and can be used as a high-efficiency wave-absorbing material. The material of the invention has good environmental stability.
Further, the heat preservation time is selected to ensure the strength of the carbon skeleton after 1.5-2.5 hours of heat preservation in the step 3, so that the structure of the carbon skeleton cannot be damaged when the template is removed in the later period.
Furthermore, the invention can control the quantity and the length of the carbon nano tubes by changing the addition amount of the cobalt salt.
The porous carbon @ carbon nanotube wave-absorbing material prepared by the invention has an obvious porous structure, and meanwhile, the carbon nanotube growing in situ exists on the porous carbon skeleton, so that the appearance is novel. The material has a porous structure which can effectively reduce epsilonrThe loss characteristics are improved while the impedance matching characteristics are improved. With Co being formed during pyrolysis9S8The carbon nano tube is grown in an in-situ catalytic manner, wherein the carbon nano tube has special electromagnetic performance and good wave absorbing effect, and has wide absorption frequency band and low density; co9S8As a magnetic particle, the magnetic particle has higher saturation magnetization, so that the material has stronger magnetic loss, and the improvement of impedance matching characteristics is facilitated, so that the wave-absorbing material has lower filling amount in a matrix and has good wave-absorbing performance.
Drawings
Fig. 1 is an XRD pattern of the porous carbon @ carbon nanotube wave-absorbing material in embodiment 5 of the present invention.
Fig. 2 is an SEM image of a precursor of the porous carbon @ carbon nanotube wave-absorbing material, i.e., a solid F, prepared in example 5 of the present invention, when the sodium chloride template is removed after the reaction in the argon atmosphere.
Fig. 3 is an SEM image of the porous carbon @ carbon nanotube wave-absorbing material prepared by the in-situ thermal carbonization method when the addition amount of cobalt chloride hexahydrate of the porous carbon precursor prepared in example 5 of the present invention is 0.06 g.
Fig. 4 is an SEM image of the porous carbon @ carbon nanotube wave-absorbing material prepared by the in-situ thermal carbonization method when the addition amount of cobalt chloride hexahydrate of the porous carbon precursor prepared in example 8 of the present invention is 0.12 g.
FIG. 5 is a wave-absorbing reflection loss graph of the porous carbon @ carbon nanotube wave-absorbing material prepared in example 5 of the present invention when the filling amount is 5 wt% and the thickness is 3.1 mm.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses a method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template, which comprises the following specific steps:
step 1: firstly, adding thiourea into a saturated sodium chloride solution, and dispersing to obtain a mixed solution A;
step 2: then adding sucrose into the mixed solution A, and uniformly dispersing to obtain a mixed solution B;
and step 3: adding cobalt chloride hexahydrate into the mixed solution B, and uniformly dispersing to obtain a mixed solution C;
and 4, step 4: adding sufficient liquid nitrogen into the mixed solution C after ultrasonic treatment, and freeze-drying to obtain a solid D;
and 5: pyrolyzing the solid D at 590-610 ℃ in an argon atmosphere to obtain a solid E;
step 6: grinding the solid E, adding deionized water, performing ultrasonic treatment, filtering, collecting, and performing vacuum drying to obtain a solid F;
and 7: and pyrolyzing the solid F at 890-910 ℃ in an argon atmosphere to obtain the porous carbon @ carbon nanotube wave-absorbing material.
In the step 4, the power of the ultrasound is 600W, and the time of the ultrasound is 0.8-1.2 h.
In the step 5, the temperature is raised to 590-610 ℃ at the speed of 1-3 ℃/min, and the reaction is carried out for 1.5-2.5 h.
And 6, the power of the ultrasound in the step 6 is 600W, and the time of the ultrasound is 4-6 h.
In the step 6, the vacuum drying temperature is 75-85 ℃, and the vacuum drying time is 11-13 h.
In the step 7, the temperature is raised to 890-910 ℃ at the speed of 1-3 ℃/min, and the reaction is carried out for 1.5-2.5 h.
The ratio of thiourea to the saturated sodium chloride solution to the sucrose to the cobalt chloride hexahydrate in the steps 1, 2 and 3 is (0.9-1.1) g: 12mL of: (0.9-1.1) g: (0.03-0.12), preferably (0.9-1.1): 12mL of: (0.9-1.1) g: (0.06-0.12) g.
Example 1
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 0.9g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) Then, 0.9g of sucrose was added to the mixed solution a, and dispersed uniformly to obtain a mixed solution B.
(3) Adding 0.03g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 0.8h, adding 100mL of liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 590 ℃ at the speed of 1 ℃/min under the argon atmosphere, and then preserving the heat for 1.5h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 4h, filtering, and vacuum drying at 75 ℃ for 11h to obtain a solid F.
(7) And (3) heating the solid F to 890 ℃ at the speed of 1 ℃/min under the argon atmosphere, and then preserving the heat for 1.5h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 2
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 1g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) And then adding 1g of sucrose into the mixed solution A, and uniformly dispersing to obtain a mixed solution B.
(3) Adding 0.03g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) carrying out ultrasonic treatment on the mixed solution C at 600W for 1h, adding 150mL of liquid nitrogen, and carrying out freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 600 ℃ at the speed of 2 ℃/min under the argon atmosphere, and then preserving the heat for 2h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 5h, filtering, and vacuum drying at 80 ℃ for 12h to obtain a solid F.
(7) And (3) heating the solid F to 900 ℃ at the speed of 2 ℃/min under the argon atmosphere, and then preserving the heat for 2h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 3
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 1.1g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) Then, 1.1g of sucrose was added to the mixed solution a, and dispersed uniformly to obtain a mixed solution B.
(3) Adding 0.03g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 1.2h, adding 200mL of liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 610 ℃ at the speed of 3 ℃/min under the argon atmosphere, and then preserving the heat for 2.5h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 6h, filtering, and vacuum drying at 85 ℃ for 13h to obtain a solid F.
(7) And (3) heating the solid F to 910 ℃ at a speed of 3 ℃/min under the argon atmosphere, and then preserving heat for 2.5h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 4
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 0.9g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) Then, 0.9g of sucrose was added to the mixed solution a, and dispersed uniformly to obtain a mixed solution B.
(3) Adding 0.06g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 0.8h, adding 100mL of liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 590 ℃ at the speed of 1 ℃/min under the argon atmosphere, and then preserving the heat for 1.5h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 4h, filtering, and vacuum drying at 75 ℃ for 11h to obtain a solid F.
(7) And (3) heating the solid F to 890 ℃ at the speed of 1 ℃/min under the argon atmosphere, and then preserving the heat for 1.5h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 5
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 1g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) And then adding 1g of sucrose into the mixed solution A, and uniformly dispersing to obtain a mixed solution B.
(3) Adding 0.06g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) carrying out ultrasonic treatment on the mixed solution C at 600W for 1h, adding 150mL of liquid nitrogen, and carrying out freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 600 ℃ at the speed of 2 ℃/min under the argon atmosphere, and then preserving the heat for 2h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 5h, filtering, and vacuum drying at 80 ℃ for 12h to obtain a solid F.
(7) And (3) heating the solid F to 900 ℃ at the speed of 2 ℃/min under the argon atmosphere, and then preserving the heat for 2h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 6
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 1.1g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) Then, 1.1g of sucrose was added to the mixed solution a, and dispersed uniformly to obtain a mixed solution B.
(3) Adding 0.06g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 1.2h, adding sufficient liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 610 ℃ at the speed of 3 ℃/min under the argon atmosphere, and then preserving the heat for 2.5h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 6h, filtering, and vacuum drying at 85 ℃ for 13h to obtain a solid F.
(7) And (3) heating the solid F to 910 ℃ at a speed of 3 ℃/min under the argon atmosphere, and then preserving heat for 2.5h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 7
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 0.9g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) Then, 0.9g of sucrose was added to the mixed solution a, and dispersed uniformly to obtain a mixed solution B.
(3) Adding 0.12g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 0.8h, adding sufficient liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 590 ℃ at the speed of 1 ℃/min under the argon atmosphere, and then preserving the heat for 1.5h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 4h, filtering, and vacuum drying at 75 ℃ for 11h to obtain a solid F.
(7) And (3) heating the solid F to 890 ℃ at the speed of 1 ℃/min under the argon atmosphere, and then preserving the heat for 1.5h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 8
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 1g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) And then adding 1g of sucrose into the mixed solution A, and uniformly dispersing to obtain a mixed solution B.
(3) Adding 0.12g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 1h, adding sufficient liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 600 ℃ at the speed of 2 ℃/min under the argon atmosphere, and then preserving the heat for 2h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 5h, filtering, and vacuum drying at 80 ℃ for 12h to obtain a solid F.
(7) And (3) heating the solid F to 900 ℃ at the speed of 2 ℃/min under the argon atmosphere, and then preserving the heat for 2h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
Example 9
A method for preparing a porous carbon @ carbon nanotube wave-absorbing material by taking sodium chloride as a template comprises the following steps:
(1) first, 1.1g of thiourea was dispersed in 12mL of a saturated sodium chloride solution to obtain a mixed solution A.
(2) Then, 1.1g of sucrose was added to the mixed solution a, and dispersed uniformly to obtain a mixed solution B.
(3) Adding 0.12g of cobalt chloride hexahydrate into the mixed solution B to obtain a mixed solution C;
(4) performing ultrasonic treatment on the mixed solution C at 600W for 1.2h, adding sufficient liquid nitrogen, and performing freeze drying for 24h to obtain a solid D;
(5) and (3) heating the solid D to 610 ℃ at the speed of 3 ℃/min under the argon atmosphere, and then preserving the heat for 2.5h to obtain a solid E.
(6) Grinding the solid E, adding deionized water, performing ultrasonic treatment at 600W for 6h, filtering, and vacuum drying at 85 ℃ for 13h to obtain a solid F.
(7) And (3) heating the solid F to 910 ℃ at a speed of 3 ℃/min under the argon atmosphere, and then preserving heat for 2.5h to obtain the porous carbon @ carbon nanotube wave-absorbing material.
The materials prepared in example 5 and example 8 were characterized. Fig. 1 is an XRD pattern of the porous carbon @ carbon nanotube wave-absorbing material prepared in example 5, fig. 2 is an SEM pattern of a porous carbon skeleton precursor, i.e., a solid F, prepared in example 5, fig. 3 is an SEM pattern of the porous carbon @ carbon nanotube wave-absorbing material prepared in example 5, fig. 4 is an SEM pattern of the porous carbon @ carbon nanotube wave-absorbing material prepared in example 8, and fig. 5 is a reflection loss pattern of the porous carbon @ carbon nanotube wave-absorbing material prepared in example 5.
As can be seen from figure 1, the porous carbon @ carbon nanotube wave-absorbing material disclosed by the invention has crystalline carbon and Co9S8Characteristic peaks of the particles.
As can be seen from figure 2, the porous carbon skeleton precursor of the porous carbon @ carbon nanotube wave-absorbing material has an obvious porous structure.
As can be seen from fig. 3 and 4, the porous carbon @ carbon nanotube wave-absorbing material has an obvious porous structure, and meanwhile, the carbon nanotubes grown in situ exist on the porous carbon skeleton, so that the appearance is novel, and the number of the carbon nanotubes is gradually increased and the length of the carbon nanotubes is gradually shortened along with the increase of the addition amount of the cobalt salt. The material has a porous structure which can effectively reduce epsilonrThe loss characteristics are improved while the impedance matching characteristics are improved. And from Co during pyrolysis9S8The carbon nano tube grows in situ through catalysis, has special electromagnetic performance and good wave absorbing effect, and has wide absorption frequency band and low density. Co at the same time9S8The magnetic particles have a large saturation magnetization, thereby giving a material a strong magnetic loss and contributing to improvement of impedance matching characteristics. Therefore, the wave-absorbing material has low filling amount in the matrix and good wave-absorbing performance.
As can be seen from FIG. 5, when the mass of cobalt chloride hexahydrate is 0.06g, the thickness of the porous carbon @ carbon nanotube wave-absorbing material is 3.1mm, the filling amount is 5 wt%, and the maximum reflection loss is-39.63 dB at 8.96 GHz.
According to the invention, the porous carbon @ carbon nanotube wave-absorbing material is prepared by taking sodium chloride as a template, and the porous carbon @ carbon nanotube wave-absorbing material is prepared by removing the template and adopting an in-situ thermal carbonization method based on the prepared porous carbon precursor. The porous carbon @ carbon nanotube wave-absorbing material prepared by the invention has an obvious porous structure, the preparation conditions can be well controlled, the equipment operation requirement is low, the process is simple, the energy consumption is low, and the porous carbon @ carbon nanotube wave-absorbing material can be continuously operated and is easy to control. Based on the prepared porous carbon precursor, the prepared porous carbon @ carbon nanotube wave-absorbing material is low in filling amount and good in wave-absorbing performance by adopting an in-situ thermal carbonization method.
Claims (8)
1. A preparation method of a porous carbon @ carbon nanotube wave-absorbing material is characterized by comprising the following steps:
step 1, adding thiourea, sucrose and cobalt chloride hexahydrate into a saturated sodium chloride solution, and uniformly dispersing to obtain a mixed solution C;
step 2, carrying out ultrasonic treatment on the mixed solution C, and then carrying out freeze drying to obtain a solid D;
step 3, pyrolyzing the solid D at 590-610 ℃ in a protective atmosphere to obtain a solid E;
step 4, grinding the solid E, adding water, performing ultrasonic treatment, filtering, collecting the solid, and performing vacuum drying to obtain a solid F;
step 5, pyrolyzing the solid F at 890-910 ℃ in a protective atmosphere to obtain a porous carbon @ carbon nanotube wave-absorbing material;
the ratio of thiourea to sucrose to cobalt chloride hexahydrate to saturated sodium chloride solution is (0.9-1.1) g: (0.9-1.1) g: (0.03-0.12) g: 12 mL.
2. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, characterized in that the step 1 specifically comprises: firstly, adding thiourea into a saturated sodium chloride solution, and dispersing to obtain a mixed solution A; then adding sucrose into the mixed solution A, and uniformly dispersing to obtain a mixed solution B; and adding cobalt chloride hexahydrate into the mixed solution B, and uniformly dispersing to obtain a mixed solution C.
3. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, wherein in the step 3, the pyrolysis time is 1.5-2.5 hours.
4. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, wherein in the step 3, the temperature is raised to 590-610 ℃ at a rate of 1-3 ℃/min.
5. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, wherein in the step 5, the pyrolysis time is 1.5-2.5 hours.
6. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, wherein in the step 5, the temperature is raised to 890-910 ℃ at a rate of 1-3 ℃/min.
7. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, wherein in the step 2, the ultrasonic power is 600W, and the ultrasonic time is 0.8-1.2 h; in the step 6, the power of the ultrasound is 600W, and the time of the ultrasound is 4-6 h.
8. The preparation method of the porous carbon @ carbon nanotube wave-absorbing material according to claim 1, wherein in the step 4, the vacuum drying temperature is 75-85 ℃, and the vacuum drying time is 11-13 hours.
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