Layered cobalt aluminum oxide / copper sulfide wave-absorbing material and preparation method thereof

Abstract

The invention discloses a layered cobalt aluminum oxide / copper sulfide wave-absorbing material and a preparation method thereof, and belongs to the technical field of novel wave-absorbing materials, the wave-absorbing material is prepared through a two-step hydrothermal method, lamellar cobalt aluminum hydroxide is prepared through the hydrothermal method, then the lamellar cobalt aluminum oxide subjected to heat treatment is used as a substrate, and the lamellar cobalt aluminum oxide / copper sulfide wave-absorbing material is prepared through the two-step hydrothermal method. The preparation method comprises the following steps: growing nano flaky copper sulfide on the cobalt-aluminum oxide / copper sulfide composite material by adopting a hydrothermal method to form a layered cobalt-aluminum oxide / copper sulfide heterostructure, and adjusting the wave-absorbing property of the composite material by adjusting the content of the copper sulfide in the composite material. According to the layered cobalt aluminum oxide / copper sulfide wave-absorbing material and the preparation method thereof, the layered cobalt aluminum oxide / copper sulfide wave-absorbing material has the advantages that the density is relatively low, the effective absorption frequency band is relatively wide, the electromagnetic wave absorption performance is relatively high, the preparation method is simple, the morphology of the composite material can be regulated and controlled, and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of novel microwave absorbing materials, and particularly to a layered cobalt aluminum oxide / copper sulfide microwave absorbing material and a preparation method thereof. Background Art

[0002] With the continuous progress of science and technology, electronic devices are more and more widely used. While bringing great convenience to people's production and life, it also brings a series of problems. One of the most serious problems is the electromagnetic pollution generated during the use of electronic devices. In order to reduce the harm of electromagnetic waves to people's normal life and physical health, the demand for microwave absorbing materials that can effectively absorb electromagnetic waves has increased rapidly and has developed rapidly. At the same time, with the continuous research and development of microwave absorbing materials, new requirements of "thin, light, wide, and strong" have been put forward for them. Since the performance of single-component materials is limited to a certain extent, different materials are often compounded to improve the performance of the materials. At the same time, structural design of different materials is also an effective method to improve the microwave absorption performance of the materials, such as forming core-shell structures, "yolk" structures, and hollow structures. As a typical two-dimensional material, layered hydroxide has a unique layered structure and exhibits characteristics such as rich interlayers, rich interfaces, high specific surface area, and rich active sites, so it is widely used in fields such as catalysis, capacitors, and electrochemistry. Layered hydroxide has also gradually been applied in the electromagnetic wave field. However, due to its poor conductivity and impedance matching, the performance of pure layered hydroxide and layered oxide obtained after heat treatment is poor and cannot be directly applied in the electromagnetic wave field.

[0003] As a traditional two-dimensional material, copper sulfide is a p-type semiconductor with excellent optical and electronic properties, unique physical and chemical properties, and can be applied in fields such as optoelectronics, energy storage, and lithium-ion batteries. Its application in the electromagnetic wave field has also been studied to a certain extent. Pure copper sulfide powder has a certain loss ability for incident electromagnetic waves, but its effective absorption frequency band with a reflection loss below -10 dB is relatively narrow and cannot meet the requirements of modern science and technology for the wide effective absorption frequency band of microwave absorbing materials, and its microwave absorption performance is limited to a certain extent. Summary of the Invention

[0004] The purpose of the present invention is to provide a layered cobalt aluminum oxide / copper sulfide microwave absorbing material and a preparation method thereof. By compounding lamellar cobalt aluminum oxide and nano-sheet copper sulfide, a layered cobalt aluminum oxide / copper sulfide microwave absorbing material with a core-shell structure having a heterogeneous interface is obtained.

[0005] To achieve the above purpose, the present invention provides a preparation method of a layered cobalt aluminum oxide / copper sulfide microwave absorbing material. By compounding layered cobalt aluminum oxide and copper sulfide, the combination of two different substances has a heterogeneous interface to form a heterogeneous structure, which specifically includes the following steps: Step 1: Weigh cobalt nitrate, aluminum nitrate and urea, dissolve them in deionized water, and magnetically stir to obtain a clear and transparent solution 1. Step 2: Transfer the clear and transparent solution 1 obtained in Step 1 to a hydrothermal reactor for hydrothermal reaction to obtain powder 1. Step 3: Wash, centrifuge and dry the powder 1 obtained in Step 2 to obtain lamellar cobalt-aluminum hydroxide. Step 4: Transfer the lamellar cobalt-aluminum hydroxide obtained in Step 3 to a tubular furnace, heat it up for reaction, and cool it to room temperature after the reaction to obtain lamellar cobalt-aluminum oxide. Step 5: Dissolve the lamellar cobalt-aluminum oxide obtained in Step 4 in deionized water, then add copper sulfate and thiourea in sequence, and magnetically stir to obtain a clear and transparent solution 2. Step 6: Transfer the clear and transparent solution 2 obtained in Step 5 to a hydrothermal reactor for hydrothermal reaction to obtain powder 2. Step 7: Wash, centrifuge and dry the powder 2 obtained in Step 6 to obtain a layered cobalt-aluminum oxide / cuprous sulfide microwave absorption material.

[0006] Preferably, in Step 1, the mass ratio of cobalt nitrate, aluminum nitrate, urea and deionized water is (0.291 - 0.873):(0.375 - 1.125):(0.420 - 0.781):70.

[0007] Preferably, in Step 2, the hydrothermal reaction temperature is 100 - 150 °C, and the hydrothermal reaction time is 18 - 24 h.

[0008] Preferably, in Step 3, the washing is carried out with deionized water and absolute ethanol. First, wash with deionized water 2 - 3 times, then wash with absolute ethanol 2 - 3 times. The drying temperature is 50 - 100 °C, and the drying time is 10 - 12 h.

[0009] Preferably, in Step 4, the atmosphere in the tubular furnace is air, the heating rate is 3 - 5 °C / min, heat up to 450 - 550 °C, and react for 3 - 5 h.

[0010] Preferably, in Step 5, the mass ratio of layered cobalt-aluminum oxide, copper sulfate, thiourea and deionized water is 0.5:(0.062 - 0.188):(0.035 - 0.105):80.

[0011] Preferably, in Step 6, the hydrothermal reaction temperature is 180 - 220 °C, and the hydrothermal reaction time is 18 - 24 h.

[0012] Preferably, in Step 7, the washing is carried out with deionized water and absolute ethanol. First, wash with deionized water 3 - 5 times, then wash with absolute ethanol 1 - 2 times. The drying temperature is 50 - 100 °C, and the drying time is 10 - 12 h.

[0013] The present invention also provides a layered cobalt aluminum oxide / copper sulfide microwave absorbing material, which is prepared by using the preparation method of a layered cobalt aluminum oxide / copper sulfide microwave absorbing material described above.

[0014] Therefore, by using the above-mentioned layered cobalt aluminum oxide / copper sulfide microwave absorbing material and its preparation method, the present invention has the following beneficial effects: (1) The layered cobalt aluminum oxide / copper sulfide microwave absorbing material of the present invention first prepares lamellar cobalt aluminum hydroxide by a simple hydrothermal method, and then the heat treatment performed on it not only retains the two-dimensional lamellar structure, but also increases the number of surface defects of the material, which is beneficial to the nucleation and growth of copper sulfide on the surface of the lamellar cobalt aluminum oxide; (2) The layered cobalt aluminum oxide / copper sulfide microwave absorbing material of the present invention forms a core-shell structured layered cobalt aluminum oxide / copper sulfide composite material, introducing a heterointerface, which can generate interfacial polarization when electromagnetic waves are incident, enhancing the loss ability of the material to electromagnetic waves and achieving stronger microwave absorbing performance; (3) The layered cobalt aluminum oxide / copper sulfide microwave absorbing material of the present invention can adjust the coating of nano-sheet copper sulfide on the surface of the lamellar cobalt aluminum oxide by changing the masses of copper sulfate and thiourea added, changing the overall morphology of the composite material, thereby regulating the generation of the heterointerface of the composite material; (4) The layered cobalt aluminum oxide / copper sulfide microwave absorbing material of the present invention composites two two-dimensional materials with different morphologies to form a heterointerface. At the same time, there are a large number of defects in the unique lamellar structures of the lamellar cobalt aluminum oxide and copper sulfide. After the lamellar cobalt aluminum oxide is heat-treated, the number of internal defects can also increase, which can enhance the interfacial polarization and dipole polarization generated when electromagnetic waves are incident, thereby improving the loss performance of the layered cobalt aluminum oxide / copper sulfide microwave absorbing material to electromagnetic waves; (5) There is cobalt element in the layered cobalt aluminum oxide / copper sulfide microwave absorbing material of the present invention. The cobalt oxide generated after heat treatment has certain magnetism and can generate certain magnetic loss when electromagnetic waves are incident, which can cooperate with the dielectric loss generated by aluminum oxide and the external shell layer of copper sulfide to form a multiple loss mechanism, significantly improving the microwave absorbing performance of the composite material; (6) For the layered cobalt aluminum oxide / copper sulfide microwave absorbing material of the present invention, when the thickness is 1.8 mm, the minimum reflection loss at 12.22 GHz reaches -42.89 GHz, and the widest effective absorption band (reflection loss below -10 dB) at this time reaches 3.62 GHz. The loss ability to incident electromagnetic waves and the effective absorption band are both better than those of pure layered cobalt aluminum oxide powder and pure copper sulfide powder.

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0016] Figure 1 It is a SEM image of the layered cobalt aluminum oxide / copper sulfide microwave absorbing material in Example 1 of the present invention; Figure 2 It is the microwave absorption performance diagram of the layered cobalt aluminum oxide / copper sulfide microwave absorbing material in Example 1 of the present invention; Figure 3 It is a SEM image of the layered cobalt aluminum oxide / copper sulfide microwave absorbing material in Example 2 of the present invention; Figure 4 It is the microwave absorption performance diagram of the layered cobalt aluminum oxide / copper sulfide microwave absorbing material in Example 2 of the present invention; Figure 5 It is a SEM image of the lamellar cobalt aluminum oxide microwave absorbing material in Comparative Example 1 of the present invention; Figure 6 It is the microwave absorption performance diagram of the lamellar cobalt aluminum oxide microwave absorbing material in Comparative Example 1 of the present invention; Figure 7 It is a SEM image of the copper sulfide microwave absorbing material in Comparative Example 2 of the present invention; Figure 8 It is the microwave absorption performance diagram of the copper sulfide microwave absorbing material in Comparative Example 2 of the present invention. Detailed Embodiments

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains.

[0019] The present invention provides a layered cobalt aluminum oxide / copper sulfide microwave absorbing material, which composites two different two-dimensional lamellar materials, namely lamellar cobalt aluminum oxide and copper sulfide. There is a heterojunction interface between the combination of the two different substances, forming a heterostructure. The preparation method specifically includes the following steps: Step 1: Weigh cobalt nitrate, aluminum nitrate and urea and dissolve them in deionized water, and magnetically stir to obtain a clear and transparent solution 1. Among them, the mass ratio of cobalt nitrate, aluminum nitrate, urea and deionized water is (0.291 - 0.873):(0.375 - 1.125):(0.420 - 0.781):70.

[0020] Step 2: Transfer the clear and transparent solution 1 obtained in Step 1 to a hydrothermal reaction kettle for hydrothermal reaction to obtain powder 1. Among them, the hydrothermal reaction temperature is 100 - 150 °C, and the hydrothermal reaction time is 18 - 24 h.

[0021] Step 3: Wash, centrifuge, and dry the powder obtained in Step 2 to obtain lamellar cobalt aluminum hydroxide. Herein, the washing is performed using deionized water and absolute ethanol. First, wash with deionized water 2 - 3 times, and then wash with absolute ethanol 2 - 3 times. The drying temperature is 50 - 100 °C, and the drying time is 10 - 12 h.

[0022] Step 4: Transfer the lamellar cobalt aluminum hydroxide obtained in Step 3 to a tube furnace, heat up for reaction, and cool to room temperature after the reaction ends to obtain lamellar cobalt aluminum oxide. Herein, the atmosphere in the tube furnace is air, the heating rate is 3 - 5 °C / min, heat up to 450 - 550 °C, and react for 3 - 5 h.

[0023] Step 5: Dissolve the lamellar cobalt aluminum oxide obtained in Step 4 in deionized water, and then successively add copper sulfate and thiourea, and magnetically stir to obtain a clear and transparent solution 2. Herein, the mass ratio of the lamellar cobalt aluminum oxide, copper sulfate, thiourea, and deionized water is 0.5:(0.062 - 0.188):(0.035 - 0.105):80.

[0024] Step 6: Transfer the clear and transparent solution 2 obtained in Step 5 to a hydrothermal reaction kettle for hydrothermal reaction to obtain powder 2. Herein, the hydrothermal reaction temperature is 180 - 220 °C, and the hydrothermal reaction time is 18 - 24 h.

[0025] Step 7: Wash, centrifuge, and dry the powder 2 obtained in Step 6 to obtain a lamellar cobalt aluminum oxide / copper sulfide microwave absorption material. Herein, the washing is performed using deionized water and absolute ethanol. First, wash with deionized water 3 - 5 times, and then wash with absolute ethanol 1 - 2 times. The drying temperature is 50 - 100 °C, and the drying time is 10 - 12 h.

[0026] Example 1 The present invention provides a lamellar cobalt aluminum oxide / copper sulfide microwave absorption material, and its preparation method specifically includes the following steps: S1: Weigh 0.291 g of cobalt nitrate, 1.125 g of aluminum nitrate, and 0.781 g of urea respectively, dissolve them in 70 mL of deionized water, magnetically stir for 30 min, transfer the solution to a hydrothermal reaction kettle with a 100 mL polytetrafluoroethylene inner liner, and react at 110 °C in a blast drying oven for 20 h.

[0027] S2: Wash the powder obtained after the reaction in S1 with deionized water 3 times, then wash with absolute ethanol 3 times, and finally dry the centrifuged powder in a blast drying oven at 70 °C for 12 h to obtain lamellar cobalt aluminum hydroxide.

[0028] S3. Place the dried lamellar cobalt aluminum hydroxide in S2 in a crucible, place it in a tube furnace, heat it to 500 °C at a heating rate of 5 °C / min in an air atmosphere, and hold it at this temperature for 5 h. After the reaction is completed, cool it naturally to room temperature to obtain lamellar cobalt aluminum oxide.

[0029] S4. Dissolve the lamellar cobalt aluminum oxide obtained after heat treatment in S3 in 80 mL of deionized water, then add 0.125 g of copper sulfate and 0.07 g of thiourea in sequence, stir magnetically for 1 h, transfer the solution to a hydrothermal reaction kettle with a 100 mL polytetrafluoroethylene inner liner, and react at 200 °C in a forced-air drying oven for 20 h.

[0030] S5. Wash the powder obtained after the reaction in S4 twice with deionized water, then wash it three times with absolute ethanol. Finally, dry the centrifuged powder in a forced-air drying oven at 60 °C for 10 h to obtain a lamellar cobalt aluminum oxide / copper sulfide microwave absorbing material.

[0031] Prepare coaxial ring samples (the inner diameter of the coaxial ring sample is 3 mm and the outer diameter is 7 mm) according to the proportion that the doping amount of lamellar cobalt aluminum oxide in paraffin is 30%. Measure the electromagnetic parameters of the sample through a vector network analyzer, and then calculate the microwave absorbing performance of the material through CST STUDIO SUITE software.

[0032] The SEM image of the prepared core-shell structured lamellar cobalt aluminum oxide / copper sulfide microwave absorbing material is as Figure 1 shown. It can be seen that a layer of nano-sheet-like copper sulfide is evenly coated on the outside of the lamellar cobalt aluminum oxide, indicating that the two materials are compounded to form a core-shell structure, and a heterojunction interface can be formed. The microwave absorbing performance of the prepared lamellar cobalt aluminum oxide / copper sulfide microwave absorbing material is as Figure 2 shown. It can be seen from the figure that when the thickness of the composite material is 1.8 mm, the minimum reflection loss at 12.22 GHz reaches -42.89 GHz, and the widest effective absorption band at this time reaches 3.62 GHz.

[0033] Example 2 The present invention provides a lamellar cobalt aluminum oxide / copper sulfide microwave absorbing material, and its preparation method specifically includes the following steps: S1. Weigh 0.291 g of cobalt nitrate, 1.125 g of aluminum nitrate and 0.781 g of urea respectively, dissolve them in 70 mL of deionized water, stir magnetically for 30 min, transfer the solution to a hydrothermal reaction kettle with a 100 mL polytetrafluoroethylene inner liner, and react at 110 °C in a forced-air drying oven for 20 h.

[0034] S2. Wash the powder obtained after the reaction in S1 three times with deionized water, then wash it three times with absolute ethanol. Finally, dry the centrifuged powder in a forced-air drying oven at 70 °C for 12 h to obtain lamellar cobalt aluminum hydroxide.

[0035] S3. Place the dried lamellar cobalt aluminum hydroxide in S2 in a crucible and place it in a tube furnace. Heat it to 500 °C at a heating rate of 5 °C / min in an air atmosphere and hold it at this temperature for 5 h. After the reaction is completed, cool it naturally to room temperature to obtain lamellar cobalt aluminum oxide.

[0036] S4. Dissolve the lamellar cobalt aluminum oxide obtained after heat treatment in S3 in 80 mL of deionized water, then add 0.188 g of copper sulfate and 0.105 g of thiourea in sequence, stir magnetically for 1 h, transfer the solution to a hydrothermal reaction kettle with a 100 mL polytetrafluoroethylene inner liner, and react at 200 °C in a forced-air drying oven for 20 h.

[0037] S5. Wash the powder obtained after the reaction in S4 twice with deionized water, then wash it three times with absolute ethanol. Finally, dry the centrifuged powder in a forced-air drying oven at 60 °C for 10 h.

[0038] Prepare coaxial ring samples (the inner diameter of the coaxial ring samples is 3 mm and the outer diameter is 7 mm) according to the proportion that the doping amount of lamellar cobalt aluminum oxide in paraffin is 30%. Measure the electromagnetic parameters of the samples with a vector network analyzer, and then calculate the wave absorption performance of the material through CST STUDIO SUITE software.

[0039] The SEM image of the prepared core-shell structured lamellar cobalt aluminum oxide / cuprous sulfide wave-absorbing material is as Figure 3 shown. It can be seen that nano-sheet-like cuprous sulfide coats the lamellar cobalt aluminum oxide with a lamellar structure, and due to the increase in the amount of cuprous sulfide generated, the overall thickness of the lamellar structured composite wave-absorbing material increases, reaching the micron level. The wave absorption performance of the prepared core-shell structured lamellar cobalt aluminum oxide / cuprous sulfide wave-absorbing material is as Figure 4 shown. It can be observed from the figure that when the thickness of the composite material is 2.3 mm, the minimum reflection loss at 10.02 GHz is -18.1 GHz, which can effectively attenuate the incident electromagnetic wave.

[0040] Comparative Example 1 The present invention provides a lamellar cobalt aluminum oxide / cuprous sulfide wave-absorbing material, and its preparation method specifically includes the following steps: (1) Weigh 0.291 g of cobalt nitrate, 0.375 g of aluminum nitrate, and 0.420 g of urea respectively and dissolve them in 70 mL of deionized water. Stir magnetically for 30 min, transfer the solution to a hydrothermal reaction kettle with a 100 mL polytetrafluoroethylene inner liner, and react at 110 °C in a forced-air drying oven for 20 h.

[0041] (2) Wash the powder obtained after the reaction in (1) three times with deionized water, then three times with absolute ethanol. Finally, dry the centrifuged powder in a forced-air drying oven at 70 °C for 12 h.

[0042] (3) Put the powder dried in (2) into a crucible, place it in a tubular furnace, heat it to 500 °C at a heating rate of 5 °C / min in an air atmosphere, and keep it at this temperature for 5 h. After the reaction is completed, cool it naturally to room temperature.

[0043] Prepare coaxial ring samples (the inner diameter of the coaxial ring samples is 3 mm and the outer diameter is 7 mm) according to the proportion that the doping amount of layered cobalt-aluminum oxide in paraffin is 30%. Measure the electromagnetic parameters of the samples with a vector network analyzer, and then calculate the wave absorption performance of the material through CST STUDIO SUITE software.

[0044] The SEM of the pure lamellar cobalt-aluminum oxide wave-absorbing material is as Figure 5 shown. It can be seen from the figure that the layered cobalt-aluminum oxide is in the shape of hexagonal flakes, and its wave absorption performance is as Figure 6 shown. The minimum reflection loss in the range of 2 - 18 GHz is only -2.50 dB, and the overall wave absorption performance is poor, unable to meet the actual application requirements.

[0045] Comparative Example 2 The present invention provides a layered cobalt-aluminum oxide / cuprous sulfide wave-absorbing material, and its preparation method specifically includes the following steps: (1) Weigh 0.062 g of copper sulfate and 0.035 g of thiourea respectively and dissolve them in 80 mL of deionized water. Stir magnetically for 30 min, transfer the solution to a hydrothermal reaction kettle with a 100 mL polytetrafluoroethylene inner liner, and react at 200 °C in a forced-air drying oven for 20 h.

[0046] (2) Wash the powder obtained after the reaction in (1) twice with deionized water, then three times with absolute ethanol. Finally, dry the centrifuged powder in a forced-air drying oven at 60 °C for 10 h.

[0047] Prepare coaxial ring samples (the inner diameter of the coaxial ring samples is 3 mm and the outer diameter is 7 mm) according to the proportion that the doping amount of cuprous sulfide in paraffin is 30%. Measure the electromagnetic parameters of the samples with a vector network analyzer, and then calculate the wave absorption performance of the material through CST STUDIOSUITE software.

[0048] The SEM image of the pure copper sulfide wave-absorbing material is as Figure 7 shown. It can be observed from the figure that the prepared copper sulfide material is randomly distributed nano-sheets, and a large amount of copper sulfide is stacked. The wave-absorbing performance is as Figure 8 shown. The minimum reflection loss in the range of 2 - 18 GHz is -25.25 dB, having certain wave-absorbing performance, but its average effective absorption bandwidth is relatively narrow and cannot meet the actual application requirements.

[0049] Compared with Comparative Example 1 and Comparative Example 2, the loss ability of the layered cobalt aluminum oxide / copper sulfide wave-absorbing material prepared in Example 1 for electromagnetic waves has been significantly enhanced.

[0050] Therefore, the present invention adopts the above-mentioned layered cobalt aluminum oxide / copper sulfide wave-absorbing material and its preparation method. The layered cobalt aluminum oxide / copper sulfide wave-absorbing material has the advantages of low density, wide effective absorption band, strong electromagnetic wave absorption performance, simple preparation method, and the ability to control the morphology of the composite material, etc.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material, characterized in that: The layered cobalt aluminum oxide and copper sulfide are compounded, and the combination of the two different substances has a heterogeneous interface to form a heterogeneous structure, which specifically includes the following steps: Step 1, weighing cobalt nitrate, aluminum nitrate and urea, dissolving them in deionized water, and magnetically stirring to obtain a clear and transparent solution 1; Step 2: transferring the clear transparent solution 1 obtained in step 1 to a hydrothermal reaction vessel for hydrothermal reaction to obtain powder 1; Step 3: washing, centrifuging and drying the powder 1 obtained in step 2 to obtain lamellar cobalt aluminum hydroxide; Step 4: transferring the lamellar cobalt aluminum hydroxide obtained in step 3 to a tube furnace, heating the furnace for reaction, and cooling the furnace to room temperature after the reaction to obtain lamellar cobalt aluminum oxide; Step 5, dissolving the lamellar cobalt aluminum oxide obtained in step 4 in deionized water, and then sequentially adding copper sulfate and thiourea, and magnetically stirring to obtain a clear and transparent solution 2; Step 6: transferring the clear transparent solution 2 obtained in step 5 to a hydrothermal reaction vessel for hydrothermal reaction to obtain powder 2; Step 7: Wash, centrifuge and dry the powder 2 obtained in step 6 to obtain a layered cobalt aluminum oxide / copper sulfide absorbing material.

2. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step 1, the mass ratio of cobalt nitrate, aluminum nitrate, urea and deionized water is (0.291-0.873):(0.375-1.125):(0.420-0.781):

70.

3. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step 2, the hydrothermal reaction temperature is 100-150° C., and the hydrothermal reaction time is 18-24 h.

4. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step three, deionized water and anhydrous ethanol are used for washing, first washing with deionized water for 2-3 times, and then washing with anhydrous ethanol for 2-3 times, the drying temperature is 50-100° C., and the drying time is 10-12 hours.

5. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step 4, the atmosphere in the tubular furnace is air, the heating rate is 3-5°C / min, the temperature is raised to 450-550°C, and the reaction is carried out for 3-5h.

6. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step 5, the mass ratio of layered cobalt aluminum oxide, copper sulfate, thiourea and deionized water is 0.5:(0.062-0.188):(0.035-0.105):

80.

7. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step six, the hydrothermal reaction temperature is 180-220° C., and the hydrothermal reaction time is 18-24 h.

8. The method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material according to claim 1, characterized in that: In step seven, deionized water and anhydrous ethanol are used for washing, first washing with deionized water for 3-5 times, and then washing with anhydrous ethanol for 1-2 times, the drying temperature is 50-100° C., and the drying time is 10-12 hours.

9. A layered cobalt aluminum oxide / copper sulfide absorbing material, characterized in that: The material is prepared by the method for preparing a layered cobalt aluminum oxide / copper sulfide absorbing material as described in any one of claims 1 to 8.

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