Adsorbent, preparation method and application thereof, and carbon dioxide hydration adsorption method

Abstract

The invention belongs to the field of carbon dioxide capture, and relates to an adsorbent, a preparation method and application thereof, and a carbon dioxide hydration adsorption method. The preparation method of the adsorbent comprises the following steps: S1, graphene oxide and a nitrogen-containing compound are subjected to a hydrothermal reaction in water, the condition of the hydrothermal reaction enables the graphene oxide to be doped with nitrogen and cut into quantum dots, and nitrogen-doped graphene oxide quantum dots are obtained; s2, the nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane are mixed, and the adsorbent is obtained. The method is characterized in that the graphene oxide quantum dots are prepared by taking a nitrogen-containing compound as a cutting agent and a doping agent, and on the basis, the obtained nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane are compounded to be used as a carbon dioxide hydration adsorbent, so that the separation efficiency of carbon dioxide can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the field of carbon dioxide capture, and in particular relates to an adsorbent, a preparation method and application thereof, and a method for carbon dioxide hydration adsorption. Background Art

[0002] Hydrate-based CO2 capture is a technology that rapidly captures CO2 gas through hydrate formation under mild conditions and can also release the captured CO2 gas through hydrate decomposition. The success of the practical application of this technology is hampered by certain technical difficulties in hydrate formation, such as insufficient storage capacity and slow formation speed.

[0003] At present, there are physical and chemical methods to accelerate the formation of hydrates. Physical methods include stirring, bubbling, atomization and external field methods. The purpose is to expand the contact area between the gas and liquid phases during the hydrate formation process, enhance the heat and mass transfer of hydrates, and thus accelerate the formation rate of hydrates. Chemical methods can be divided into thermodynamic promotion and kinetic promotion. Thermodynamic promotion requires the use of thermodynamic promoters, which aim to reduce the hydrate phase equilibrium conditions and adjust the reaction conditions. Thermodynamic promoters usually include tetrahydrofuran (THF), tetrabutylammonium bromide (TBAB), acetone and gas additives. Kinetic promotion requires the use of kinetic promoters. Kinetic promoters are mainly surfactants, which mainly play the role of reducing the surface tension of the liquid, reducing the diffusion resistance of gas molecules to the liquid phase, and increasing the solubility of gas molecules. Kinetic promoters include sodium dodecylbenzene sulfonate (SDBS), sodium dodecyl sulfate (SDS), etc. However, among the currently commonly used methods for accelerating hydrate formation, the physical method has a low separation efficiency and usually requires additional energy due to the complexity of the equipment, which results in higher costs in industrial production. The chemical method has a low separation efficiency and the recovery rate of the kinetic promoters such as surfactants used in the kinetic promotion process is low. Some surfactants are even toxic and harmful to the environment, which limits their practical applications. Summary of the invention

[0004] The first object of the present invention is to provide a method for preparing an adsorbent capable of improving carbon dioxide separation efficiency.

[0005] Specifically, the preparation method of the adsorbent provided by the present invention comprises the following steps:

[0006] S1. performing a hydrothermal reaction of graphene oxide and a nitrogen-containing compound in water, wherein the conditions of the hydrothermal reaction cause the graphene oxide to be doped with nitrogen and cut into quantum dots to obtain nitrogen-doped graphene oxide quantum dots;

[0007] S2. Mix nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane to obtain an adsorbent.

[0008] The second object of the present invention is to provide an adsorbent prepared by the above method.

[0009] The third object of the present invention is to provide use of the above-mentioned adsorbent as a carbon dioxide hydration adsorbent.

[0010] A fourth object of the present invention is to provide a method for hydration adsorption of carbon dioxide, which comprises subjecting a mixed gas containing carbon dioxide to hydration adsorption treatment using the above-mentioned adsorbent to capture the carbon dioxide in the mixed gas.

[0011] The key of the present invention is to prepare graphene oxide quantum dots using nitrogen-containing compounds as cutting agents and dopants. On this basis, the obtained nitrogen-doped graphene oxide quantum dots are compounded with tetrabutylammonium fluoride (TBAF) and cyclopentane (CP) for use as carbon dioxide hydration adsorbents, which can effectively improve the separation efficiency of carbon dioxide. It is speculated that the reason may be due to: on the one hand, using nitrogen-containing compounds as cutting agents and dopants to prepare graphene oxide quantum dots, nitrogen atoms can be effectively incorporated into graphene oxide quantum dots, and the introduction of nitrogen atoms can more effectively reduce liquid surface tension, increase gas molecule solubility, improve the heat and mass transfer capacity of the system, shorten the induction time, and thus better promote the formation of hydrates; on the other hand, graphene quantum dots are nanoparticles, and nanoparticles themselves can improve the thermal conductivity of the system, and the composite use of tetrabutylammonium fluoride and cyclopentane is conducive to the formation of nanoparticle heat conduction networks, thereby giving the system good heat and mass transfer capacity, and more conducive to promoting the formation of hydrates. That is, the present invention promotes hydrate synthesis in a coordinated manner from two dimensions, inside and outside, thereby achieving effective capture of carbon dioxide. DETAILED DESCRIPTION

[0012] The preparation method of the adsorbent provided by the present invention comprises the following steps:

[0013] S1. performing a hydrothermal reaction of graphene oxide and a nitrogen-containing compound in water, wherein the conditions of the hydrothermal reaction cause the graphene oxide to be doped with nitrogen and cut into quantum dots to obtain nitrogen-doped graphene oxide quantum dots;

[0014] S2. Mix nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane to obtain an adsorbent.

[0015] The present invention generally includes stirring and mixing graphene oxide, nitrogen-containing compounds and water for the hydrothermal reaction in step S1, and then reacting the obtained mixture under hydrothermal reaction conditions. Wherein, the mixing method can be to first add graphene oxide to water and stir and mix, then add nitrogen-containing compounds to continue stirring and mixing, or to first add nitrogen-containing compounds to water and stir and mix, then add graphene oxide to continue stirring and mixing, or to simultaneously add graphene oxide and nitrogen-containing compounds to water and stir and mix. The present invention synthesizes graphene oxide quantum dots by a hydrothermal reaction one-step method, and the required conditions are mild and controllable, and after the reaction is completed, impurities are easy to remove, with a higher yield. The nitrogen-doped graphene oxide quantum dots obtained by hydrothermal reaction are a kind of tiny nanoparticles, whose lateral dimensions are generally below 100nm, and whose longitudinal dimensions are below several nanometers, and have a graphene structure of one or two layers or several layers, which are very small graphene fragments. Nitrogen-doped graphene oxide quantum dots have the inherent characteristics of graphene oxide, and due to their ultra-small size and chemical activity, they have potential application prospects in catalysis. Applying nitrogen-doped graphene oxide quantum dots to the hydration adsorption of carbon dioxide can not only reduce the surface tension of the liquid and increase the solubility of gas molecules, but also improve the heat and mass transfer capacity of the system, so as to achieve the effect of promoting the formation of hydrates and shortening the induction time.

[0016] In the present invention, the mass ratio of graphene oxide to nitrogen-containing compounds is preferably 10:(1-55). On the one hand, the nitrogen-containing compounds are milder, and graphene oxide quantum dots can be better prepared at this ratio. On the other hand, nitrogen doping at this ratio can further improve the affinity for carbon dioxide gas, and the carbon capture in the subsequent step S2 can make the gas enter the liquid phase faster and more, and the ability to capture carbon dioxide is better. The mass ratio of graphene oxide to nitrogen-containing compounds can specifically be 10:1, 10:5, 10:10, 10:15, 10:20, 10:25, 10:30, 10:35, 10:40, 10:45, 10:50 or any value therebetween. Graphene oxide (GO) is a carbon material with a layered structure, with large specific surface area, good dispersibility in water and other excellent properties, while the graphene oxide surface has abundant functional groups to give it good hydrophilicity and lipophilicity (amphiphilicity), the amphiphilic properties of graphene oxide make it play the role of surfactant, can also be used to promote hydrate formation. Graphene oxide has a layered structure, and the sheet diameter is preferably 10 to 200 μm, specifically 10nm, 30nm, 50nm, 80nm, 100nm, 120nm, 150nm, 180nm, 200nm or any value therebetween. The type of nitrogen-containing compound is not particularly limited, as long as it can be used as a cutting agent to prepare graphene oxide quantum dots and can be used as a dopant to improve the efficiency of carbon dioxide separation, preferably ammonia, urea or a mixture of ammonia and urea, particularly preferably ammonia. In addition, when the amount of nitrogen-containing compound is just enough to adjust the pH value of the hydrothermal reaction system to the target range, there is no need to add other pH regulators to adjust the pH value.

[0017] In the present invention, the conditions of the hydrothermal reaction preferably include a temperature of 70 to 200°C, such as 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C or any value therebetween; a pH value of 10 to 12, such as 10, 10.5, 11, 11.5, 12 or any value therebetween; and a time of 3 to 10 hours, such as 3 hours, 4 hours, 6 hours, 8 hours, 10 hours or any value therebetween. In addition, in order to improve the efficiency and effect of the hydrothermal reaction, the conditions of the hydrothermal reaction most preferably include a temperature of 120 to 150°C, a pH value of 10 to 12, and a time of 5 to 8 hours.

[0018] In the present invention, the preparation method of the adsorbent provided by the present invention also includes a purification step after the hydrothermal reaction in step S1. The purification method is not particularly limited as long as it can remove impurities (such as unreacted graphene oxide and / or nitrogen-containing compounds) in the hydrothermal product. In a preferred embodiment, the purification method includes cooling the hydrothermal reaction product to room temperature and then centrifuging to collect the supernatant, then heating the supernatant and dialysis separation using a dialysis bag with a molecular weight cutoff of 300Da, and then freeze-drying the obtained retentate to obtain nitrogen-doped graphene oxide quantum dots. Wherein, the rotation speed of the centrifugal separation is preferably 9000 to 10000 rpm / min, such as 9000, 9200, 9400, 9600, 9800, 10000 rpm / min. The temperature of the heating treatment is preferably 40 to 120°C, such as 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C or any value therebetween; the time is preferably 1 to 8 hours, such as 1 hour, 2 hours, 4 hours, 6 hours, 8 hours or any value therebetween. The main purpose of dialysis separation is to remove excess nitrogen-containing compounds.

[0019] In the present invention, in step S2, the ratio of nitrogen-doped graphene oxide quantum dots to tetrabutylammonium fluoride is preferably 100mg: (0.3-2) mol, such as 100mg: 0.3mol, 100mg: 0.5mol, 100mg: 0.8mol, 100mg: 1mol, 100mg: 1.2mol, 100mg: 1.5mol, 100mg: 1.8mol, 100mg: 2mol or any value therebetween. The ratio of nitrogen-doped graphene oxide quantum dots to cyclopentane is preferably 100mg: (1-10) mL, such as 100mg: 1mL, 100mg: 2mL, 100mg: 4mL, 100mg: 6mL, 100mg: 8mL, 100mg: 10mL or any value therebetween. In addition, the mixing between nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane and the subsequent composite use can be carried out in the presence of water.

[0020] The present invention also provides an adsorbent prepared by the above method. The adsorbent can be used as a kinetic promoter for carbon dioxide hydration adsorption, and through the amphiphilic properties of nitrogen-doped graphene oxide quantum dots and the compounding effect of nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane, in the process of hydration adsorption, the liquid surface tension can be reduced, the solubility of gas molecules can be increased, the mass transfer and heat transfer capacity of the system can be improved, the formation of hydrates can be promoted, and the induction time can be shortened.

[0021] The present invention also provides the use of the above-mentioned adsorbent as a carbon dioxide hydration adsorbent.

[0022] The method for hydration adsorption of carbon dioxide provided by the present invention comprises subjecting a mixed gas containing carbon dioxide to hydration adsorption treatment using the above-mentioned adsorbent to capture carbon dioxide in the mixed gas.

[0023] In the present invention, the process of hydration adsorption treatment is not particularly limited as long as it can achieve the capture of carbon dioxide in the mixed gas. In a preferred embodiment, the process of hydration adsorption treatment includes placing a hydrated adsorbent inside a hydration adsorption reactor, pressurizing the inside of the hydration adsorption reactor to above 0.2MPa, and then reducing the pressure to remove the air inside the hydration adsorption reactor, precooling the hydrated adsorbent placed inside the hydration adsorption reactor to 2-5°C, and after the temperature reaches the precooling temperature, introducing a mixed gas until the pressure reaches above 2MPa and then stopping the introduction of the mixed gas, turning on stirring during ventilation, and turning off stirring when the pressure change amplitude inside the hydration adsorption reactor drops below 0.01MPa / min, and continuing the reaction for 1-5h after stopping the introduction of the mixed gas, and then opening the gas outlet valve to collect the remaining gas. In the present invention, pressure refers to gauge pressure.

[0024] In the present invention, the mixed gas is carbon dioxide and nitrogen. The volume proportion of carbon dioxide in the mixed gas is preferably 5-30%, such as 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30% or any value therebetween.

[0025] The present invention will be described in detail below through examples.

[0026] Example 1

[0027] S1. Mix 10g of graphene oxide powder with 90mL of ammonia water (concentration of 28wt%) and 410mL of deionized water in a glass beaker. Adjust the pH of the solution to about 12, stir for 30min, transfer the mixture to a 1L polytetrafluoroethylene-lined autoclave, heat to 150°C in an oven and keep for 5h for hydrothermal reaction. After the hydrothermal reaction is completed, the reaction solution is allowed to stand and cool to room temperature, and the supernatant is collected by centrifugation at a speed of 10000rpm / min. The supernatant is heated to 100°C for 1h, and then dialyzed with a dialysis bag with a molecular weight of 300Da to remove unreacted ammonia water. After the dialysis is completed, the retained side liquid is freeze-dried to obtain nitrogen-doped graphene oxide quantum dot powder.

[0028] S2. The nitrogen-doped graphene oxide quantum dot powder, 0.3 mol% TBAF and 2.5% vol CP were dissolved in 600 mL of water, wherein the addition amount of graphene oxide quantum dots was 50 mg / L. The reaction solution was stirred and ultrasonically dispersed for 20 minutes to obtain an adsorbent.

[0029] Example 2

[0030] S1. Mix 10g of graphene oxide powder, 1g of urea and 500mL of deionized water in a glass beaker. Adjust the pH of the solution to about 12, stir for 30 minutes, transfer the mixture to a 1L polytetrafluoroethylene-lined autoclave, heat to 150°C in an oven and keep for 5 hours for hydrothermal reaction. After the hydrothermal reaction is completed, let the reaction solution stand and cool to room temperature, and collect the supernatant by centrifugation at 9000rpm / min. Heat the supernatant to 40°C for 8 hours, then dialyze with a dialysis bag with a molecular weight of 300Da to remove unreacted urea. After the dialysis is completed, the retained side liquid is freeze-dried to obtain nitrogen-doped graphene oxide quantum dot powder.

[0031] S2. The nitrogen-doped graphene oxide quantum dot powder, 0.3 mol% TBAF and 2.5% vol CP were dissolved in 600 mL of water, wherein the addition amount of graphene oxide quantum dots was 50 mg / L. The reaction solution was stirred and ultrasonically dispersed for 20 minutes to obtain an adsorbent.

[0032] Example 3

[0033] S1. Mix 10g of graphene oxide powder with 90mL of ammonia water (concentration of 28wt%) and 410mL of deionized water in a glass beaker. Adjust the pH of the solution to about 12, stir for 30min, transfer the mixture to a 1L polytetrafluoroethylene-lined autoclave, heat to 120°C in an oven and keep for 8h for hydrothermal reaction. After the hydrothermal reaction is completed, the reaction solution is allowed to stand and cool to room temperature, and the supernatant is collected by centrifugation at a speed of 10000rpm / min. The supernatant is heated to 70°C for 8h, and then dialyzed with a dialysis bag with a molecular weight of 300Da to remove unreacted ammonia water. After the dialysis is completed, the retained side liquid is freeze-dried to obtain nitrogen-doped graphene oxide quantum dot powder.

[0034] S2. The nitrogen-doped graphene oxide quantum dot powder, 0.3 mol% TBAF and 2.5% vol CP were dissolved in 600 mL of water, wherein the addition amount of graphene oxide quantum dots was 80 mg / L. The reaction solution was stirred and ultrasonically dispersed for 20 minutes to obtain an adsorbent.

[0035] Example 4

[0036] S1. Mix 10g of graphene oxide powder, 1g of urea and 500mL of deionized water in a glass beaker. Adjust the pH of the solution to about 10, stir for 30 minutes, transfer the mixture to a 1L polytetrafluoroethylene-lined autoclave, heat it to 150°C in an oven and keep it for 5 hours for hydrothermal reaction. After the hydrothermal reaction is completed, let the reaction solution stand and cool to room temperature, and collect the supernatant by centrifugation at 9000rpm / min. Heat the supernatant to 70°C for 4 hours, then dialyze it with a dialysis bag with a molecular weight of 300Da to remove unreacted urea. After the dialysis is completed, freeze-dry the retained side liquid to obtain nitrogen-doped graphene oxide quantum dot powder.

[0037] S2. The nitrogen-doped graphene oxide quantum dot powder, 0.3 mol% TBAF and 2.5% vol CP were dissolved in 600 mL of water, wherein the addition amount of graphene oxide quantum dots was 80 mg / L. The reaction solution was stirred and ultrasonically dispersed for 20 minutes to obtain an adsorbent.

[0038] Comparative Example 1

[0039] The adsorbent was prepared according to the method of Example 2, except that the preparation step of nitrogen-doped graphene oxide quantum dot powder was not included and nitrogen-doped graphene oxide quantum dot powder was not added to the adsorbent. Specifically, 0.3 mol% TBAF and 2.5% vol CP were dissolved in 600 mL of water, and the reference adsorbent was obtained after 20 min of stirring and ultrasonic dispersion and mixing.

[0040] Comparative Example 2

[0041] The adsorbent was prepared according to the method of Example 2, except that urea was not added during the preparation of graphene oxide quantum dots. The other conditions were the same as those of Example 2. The specific steps were as follows:

[0042] S1. Mix 10g of graphene oxide powder and 500mL of deionized water in a glass beaker, adjust the pH of the solution to 12 with sodium hydroxide, stir for 30 minutes, transfer the mixture to a 1L polytetrafluoroethylene-lined autoclave, heat to 150°C in an oven and keep for 5 hours for hydrothermal reaction. After the hydrothermal reaction is completed, the reaction solution is allowed to stand and cool to room temperature, and the supernatant is collected by centrifugation at 9000rpm / min. The supernatant is heated to 40°C for 8 hours, and then dialyzed with a dialysis bag with a molecular weight of 300Da. After the dialysis is completed, the retained side liquid is freeze-dried to obtain graphene oxide quantum dot powder.

[0043] S2. The graphene oxide quantum dot powder, 0.3 mol% TBAF and 2.5% vol CP were dissolved in 600 mL of water, wherein the addition amount of the graphene oxide quantum dots was 50 mg / L. The reaction solution was stirred and ultrasonically dispersed for 20 minutes to obtain an adsorbent.

[0044] Comparative Example 3

[0045] An adsorbent was prepared according to the method of Example 2, except that TBAF was replaced by the same weight portion of CP. The other conditions were the same as in Example 1, to obtain a reference adsorbent.

[0046] Comparative Example 4

[0047] An adsorbent was prepared according to the method of Example 2, except that CP was replaced by the same weight portion of TBAF. The other conditions were the same as in Example 1, to obtain a reference adsorbent.

[0048] Test Case

[0049] The adsorbents obtained in the above embodiments and the reference adsorbents obtained in the comparative examples are added to the hydration adsorption reactor from the feed port, and the interior of the hydration adsorption reactor is pressurized to 0.2MPa, and then the initial air in the hydration adsorption reactor is removed by decompression. The hydration adsorbent is precooled to 2°C using a circulating cooler, and the mixed gas is introduced after the temperature reaches the precooling temperature until the pressure reaches 2MPa and then the introduction of the mixed gas is stopped. During the ventilation process, stirring is turned on and stirred at a speed of 600rpm / min. When the pressure change amplitude inside the hydration adsorption reactor drops below 0.01MPa / min, stirring is turned off, the reaction is stopped after 2h, the outlet valve is opened to collect the remaining gas, and the content of carbon dioxide and nitrogen in the remaining gas is measured. Wherein, the content of carbon dioxide (CO2) and nitrogen (N2) in the initial mixed gas and the remaining gas and the CO2 separation efficiency are shown in Table 1. Wherein, CO2 separation efficiency = (the amount of CO2 in the gas before the reaction - the amount of CO2 in the gas after the reaction) / the amount of CO2 in the gas before the reaction × 100%.

[0050] Table 1

[0051]

[0052] From the results in Table 1, it can be seen that the present invention uses nitrogen-containing compounds as cutting agents and dopants to prepare graphene oxide quantum dots. On this basis, the obtained nitrogen-doped graphene oxide quantum dots are compounded with tetrabutylammonium fluoride (TBAF) and cyclopentane (CP) and used as carbon dioxide hydration adsorbents, which can effectively improve the separation efficiency of carbon dioxide.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A method for preparing an adsorbent, characterized in that: The method comprises the following steps: S1. performing a hydrothermal reaction of graphene oxide and a nitrogen-containing compound in water, wherein the conditions of the hydrothermal reaction are such that the graphene oxide is doped with nitrogen and cut into quantum dots to obtain nitrogen-doped graphene oxide quantum dots; S2. Mixing nitrogen-doped graphene oxide quantum dots, tetrabutylammonium fluoride and cyclopentane to obtain the adsorbent.

2. The method for preparing an adsorbent according to claim 1, characterized in that: In step S1, the hydrothermal reaction comprises stirring and mixing the graphene oxide, the nitrogen-containing compound and water, and then reacting the obtained mixture under hydrothermal reaction conditions; Preferably, the mass ratio of the graphene oxide to the nitrogen-containing compound is 10:(1-55); Preferably, the graphene oxide has a layered structure, and the sheet diameter is 10 to 200 μm; Preferably, the nitrogen-containing compound is ammonia and / or urea; Preferably, the hydrothermal reaction conditions include a temperature of 70 to 200° C., a pH value of 10 to 12, and a time of 3 to 10 hours.

3. The method for preparing an adsorbent according to claim 1 or 2, characterized in that: The method further comprises a purification step after the hydrothermal reaction in step S1; Preferably, the purification method comprises cooling the hydrothermal reaction product to room temperature and then centrifuging to collect the supernatant, heating the supernatant and then dialyzing it using a dialysis bag with a molecular weight cutoff of 300 Da, and then freeze-drying the obtained retentate to obtain nitrogen-doped graphene oxide quantum dots; Preferably, the rotation speed of the centrifugal separation is 9000-10000 rpm / min; Preferably, the heating treatment conditions include a temperature of 40 to 120° C. and a time of 1 to 8 hours.

4. The method for preparing an adsorbent according to claim 1 or 2, characterized in that: In step S2, the ratio of the nitrogen-doped graphene oxide quantum dots to tetrabutylammonium fluoride is 100 mg: (0.3-2) mol; the ratio of the nitrogen-doped graphene oxide quantum dots to cyclopentane is 100 mg: (1-10) mL.

5. An adsorbent prepared by the method according to any one of claims 1 to 4.

6. Use of the adsorbent according to claim 5 as a carbon dioxide hydration adsorbent.

7. A method for carbon dioxide hydration adsorption, characterized in that: The method comprises subjecting a mixed gas containing carbon dioxide to a hydration adsorption treatment using the adsorbent described in claim 5 to capture the carbon dioxide in the mixed gas.

8. The method for carbon dioxide hydration adsorption according to claim 7, characterized in that: The hydration adsorption treatment process includes placing a hydrated adsorbent inside a hydration adsorption reactor, pressurizing the inside of the hydration adsorption reactor to above 0.2 MPa, and then reducing the pressure to remove the air inside the hydration adsorption reactor, precooling the hydrated adsorbent placed inside the hydration adsorption reactor to 2-5°C, introducing a mixed gas after the temperature reaches the precooling temperature until the pressure reaches above 2 MPa, then stopping the introduction of the mixed gas, turning on stirring during the ventilation process, turning off stirring when the pressure change amplitude inside the hydration adsorption reactor drops below 0.01 MPa / min, continuing the reaction for 1-5 hours after stopping the introduction of the mixed gas, and then opening the gas outlet valve to collect the remaining gas.

9. The method for carbon dioxide hydration adsorption according to claim 8, characterized in that: The mixed gas is carbon dioxide and nitrogen.

10. The method for carbon dioxide hydration adsorption according to claim 8, characterized in that: The volume proportion of carbon dioxide in the mixed gas is 5-30%.

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