Carbon dioxide adsorbent based on silver metal organic framework and production method thereof

Abstract

The invention discloses a carbon dioxide adsorbent based on a silver metal organic framework and a production method thereof.The carbon dioxide adsorbent is obtained by compounding aminoethanesulfonic acid and the silver metal organic framework according to the mass ratio of 1: 1, and the production method comprises the steps that S1, a bimetal framework is synthesized; s2, preparing a silver metal organic framework; s3, amino ethanesulfonic acid modification; by compounding the aminoethanesulfonic acid and the silver metal organic framework, the distribution of metal silver in the organic framework can be optimized, and CO2 chemical adsorption is enhanced through double metal nodes and easy acidic sites; metal silver forms a silver metal framework through coordination, aminoethanesulfonic acid modifies the surface of a pore channel through a sulfonic acid group, physical adsorption and chemical adsorption on CO2 are enhanced, the obtained carbon dioxide adsorbent can be combined with the surface plasma resonance effect, light energy can be efficiently converted into heat energy under visible light, and therefore desorption energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field, and specifically relates to a carbon dioxide adsorbent based on silver metal-organic framework and a production method thereof. Background Art

[0002] The current technological development of carbon dioxide adsorbents focuses on high efficiency, low energy consumption and selective adsorption, mainly including physical adsorbents (such as activated carbon, zeolite) and chemical adsorbents (such as amino materials). Although traditional activated carbon has low cost and high stability, its adsorption capacity and selectivity are insufficient, especially in a complex gas environment, it is easily interfered by water vapor; zeolite can improve its performance through ion exchange modification, but the regeneration energy consumption is relatively high and the capture efficiency for low-concentration CO2 is limited. Among chemical adsorbents, organic amines (such as MEA) have good selectivity, but have problems such as strong corrosion, high regeneration energy consumption and thermal degradation. In recent years, MOFs have become a research hotspot due to their high specific surface area and functionalizable pores. For example, amino-functionalized UiO-66-NH2 enhances the CO2 affinity through chemical adsorption, but traditional MOFs are still limited by poor moisture stability and low thermal conductivity, resulting in insufficient regeneration efficiency. Generally speaking, the current technology needs to seek a balance among adsorption capacity, cycle stability, cost-effectiveness and adaptability to actual working conditions. Summary of the Invention

[0003] In order to solve the problems such as insufficient regeneration efficiency and unstable adsorption effect of the above-mentioned MOFs, the present invention provides a carbon dioxide adsorbent based on silver metal-organic framework and a production and preparation method thereof.

[0004] A carbon dioxide adsorbent based on silver metal-organic framework, wherein the carbon dioxide adsorbent is obtained by compounding 2-aminoethanesulfonic acid and silver metal-organic framework with a mass ratio of 1:1, and the silver metal-organic framework is prepared by a bimetallic framework, deionized water, silver nitrate and 0.1 M sodium borohydride in a ratio of 200-220 mg:10-13 mL:5 mg:2 mL.

[0005] Explanation: The above raw materials are compounded by 2-aminoethanesulfonic acid and silver metal-organic framework, which can optimize the distribution of metallic silver in the organic framework. Through the bimetallic framework nodes, the thermal stability is improved, and more Lewis acidic sites are exposed to enhance the chemical adsorption of CO2; silver nitrate is anchored in the MOF pores through amino coordination and is in-situ reduced to Ag nanoparticles by sodium borohydride, achieving a highly dispersed distribution. Combining with the surface plasmon resonance effect, the light energy can be efficiently converted into heat energy under visible light, thereby reducing the desorption energy consumption; 2-aminoethanesulfonic acid modifies the pore surface through the sulfonic acid group and synergistically acts with the amino group of the MOF to form a polar gradient field, enhancing the physical adsorption and chemical adsorption of CO2.

[0006] A production method of a carbon dioxide adsorbent based on silver metal-organic framework, comprising the following steps:

[0007] S1. Synthesize the bimetallic framework;

[0008] Take zirconium nitrate hexahydrate, copper nitrate, 2-aminoterephthalic acid, N,N-dimethylformamide, and acetic acid in the ratio of 0.233 g: 0.181 g: 0.2 g: 50 mL: 10 mL, and perform a mixing process to obtain the bimetallic framework;

[0009] S2. Prepare the silver metal-organic framework;

[0010] Take the bimetallic framework, deionized water, silver nitrate, and sodium borohydride; disperse the bimetallic framework in deionized water, add silver nitrate, stir for 2 - 3 h, then gradually add sodium borohydride dropwise, react for 20 - 30 min, perform centrifugal washing and then vacuum drying to obtain the silver metal-organic framework;

[0011] S3. Modify with 2-aminoethanesulfonic acid;

[0012] Take 2-aminoethanesulfonic acid and the silver metal-organic framework in a mass ratio of 1:1, reflux the silver metal-organic framework and 2-aminoethanesulfonic acid in ethanol at a temperature of 70 - 80 °C for 6 - 7 hours, then after centrifugal washing and vacuum drying, obtain the carbon dioxide adsorbent.

[0013] Note: The above method can synthesize the metal-organic framework by accurately proportioning raw materials such as zirconium nitrate hexahydrate and copper nitrate, providing a stable foundation for subsequent structure construction; introducing the metal-organic framework, silver nitrate, and sodium borohydride in specific proportions, and using the coordination effect between silver ions and the metal-organic framework and the reduction reaction of sodium borohydride to uniformly load silver nanoparticles on the metal-organic framework to form the silver metal-organic framework. The introduction of silver not only enhances the conductivity and chemical activity of the material but also may provide more active sites to promote carbon dioxide adsorption; finally, modify the silver metal-organic framework with 2-aminoethanesulfonic acid, and reflux at an appropriate temperature to cause chemical bonding between 2-aminoethanesulfonic acid and the material surface. Its amino groups and other groups can have a strong interaction with carbon dioxide molecules, greatly improving the selective adsorption ability of the material for carbon dioxide. This method can effectively prepare an adsorbent with high carbon dioxide adsorption performance, reducing energy consumption while improving the selectivity and adsorption efficiency of the adsorbent.

[0014] Further, the mixing process described in S1 includes: dissolving zirconium nitrate hexahydrate, copper nitrate, and 2-aminoterephthalic acid in N,N-dimethylformamide, performing microwave radiation treatment for 20 - 30 minutes; then gradually adding acetic acid dropwise, and then standing at 100 - 120 °C for 20 - 24 h, naturally cooling and then centrifuging, and washing alternately with N,N-dimethylformamide and methanol 3 times, and vacuum drying at 60 °C for 8 - 10 h to obtain the bimetallic framework.

[0015] Note: The above microwave radiation can uniformly and rapidly transfer energy to the reaction system, causing molecules to vibrate and collide rapidly, greatly accelerating the coordination reaction process between metal salts and ligands, quickly forming a preliminary metal-organic coordination structure, improving the reaction efficiency and shortening the initial reaction time; acetic acid, as a regulator, can promote the coordination reaction to proceed in the direction of forming a stable organic framework, laying a solid foundation for the subsequent preparation of high-performance carbon dioxide adsorbents.

[0016] Further, the microwave radiation treatment is carried out at a temperature of 100 - 120 °C and a microwave frequency of 2.45 GHz.

[0017] Note: The setting of the above temperature and microwave frequency not only provides a suitable energy environment for the coordination reaction, ensuring the effective formation of coordination bonds and the beginning of the construction of the preliminary crystal structure, but also does not cause the reaction system to get out of control or trigger side reactions due to excessive temperature, precisely controlling the reaction process; it can efficiently construct a preliminary and relatively stable metal-organic coordination structure in a short time.

[0018] Further, the dropping rate of acetic acid in S1 is 0.5 mL / s, and the dropping rate of sodium borohydride in S2 is 0.2 - 0.4 mL / s.

[0019] Note: In S1, acetic acid is dropped in, enabling it to diffuse uniformly and interact fully with the reaction intermediates, allowing metal ions and ligands to carry out the coordination reaction orderly in a suitable acidic environment, avoiding side reactions or crystal structure defects caused by sudden changes in local acidity, and ensuring the stable formation of the preliminary structure of the organic framework; in S2, sodium borohydride is dropped in, enabling sodium borohydride to slowly release reducing hydrogen, fully contact with silver ions and gradually reduce them to silver nanoparticles, which are uniformly loaded on the surface of the organic framework, preventing the aggregation and uneven distribution of silver particles due to too fast reaction, and ensuring that the silver metal-organic framework has a uniform microstructure and good conductivity and chemical activity.

[0020] Further, the centrifugal washing in S2 and S3 is as follows: at a rotation speed of 300 - 500 rpm, centrifuge for 10 - 15 min, and then wash alternately with deionized water and ethanol.

[0021] Note: The above parameters ensure the integrity and dispersibility of the adsorbent material. At the same time, the washing step can remove organic impurities and reduce the surface tension of the adsorbent, comprehensively and efficiently purify the surface of the adsorbent, improve its purity, and lay a foundation for the adsorbent to obtain good carbon dioxide adsorption performance and stability.

[0022] Further, the temperature of the vacuum drying in S2 and S3 is 70 - 80 °C, and the drying time is 1 - 2 h.

[0023] Note: The above parameters can achieve an ideal drying effect.

[0024] Further, in S3, first, the silver metal-organic framework is modified and then refluxed with 2-aminoethanesulfonic acid.

[0025] Explanation: Surface modification can be achieved through the modification immersion, which greatly improves the loading amount and binding strength of 2-aminoethanesulfonic acid on the silver metal-organic framework, ensuring that the finally obtained carbon dioxide adsorbent has richer and more stable adsorption active sites, significantly enhancing the selective adsorption ability and adsorption capacity for carbon dioxide, and at the same time ensuring the structural stability and performance persistence of the adsorbent during multiple cycles of use.

[0026] Further, the modification method is as follows: Immerse the silver metal-organic framework in 3-aminopropyltriethoxysilane and continuously immerse it at 60-70 °C for 3-4 h to complete the modification.

[0027] Explanation: After being modified and immersed in 3-aminopropyltriethoxysilane, the surface hydrophilicity and chemical activity of the silver metal-organic framework are significantly improved. During the reflux process with 2-aminoethanesulfonic acid, the two can be combined more quickly, efficiently and tightly to form a composite structure with more active adsorption sites and stronger binding force, greatly enhancing the adsorption affinity, selectivity and adsorption capacity of the finally obtained carbon dioxide adsorbent for carbon dioxide molecules, laying a solid foundation for its excellent performance in practical applications such as carbon dioxide capture and separation.

[0028] The beneficial effects of the present invention are as follows:

[0029] The method of the present invention synthesizes an organic framework by precisely proportioning raw materials such as zirconium nitrate hexahydrate and copper nitrate, providing a stable foundation for subsequent structure construction; introducing the organic framework, silver nitrate and sodium borohydride in specific proportions, and using the coordination effect between silver ions and the organic framework and the reduction reaction of sodium borohydride to uniformly load silver nanoparticles on the organic framework to form a silver metal-organic framework. The introduction of silver not only enhances the conductivity and chemical activity of the material, but also may provide more active sites to promote carbon dioxide adsorption; finally, the silver metal-organic framework is modified with 2-aminoethanesulfonic acid, and reflux at a suitable temperature causes chemical bonding between 2-aminoethanesulfonic acid and the material surface. Its amino groups and other groups can have a strong interaction with carbon dioxide molecules, greatly enhancing the selective adsorption ability of the material for carbon dioxide. This method can effectively prepare an adsorbent with high carbon dioxide adsorption performance, reducing energy consumption while improving the selectivity and adsorption efficiency of the adsorbent. Description of the Drawings

[0030] Figure 1 It is a schematic flow chart of Embodiment 1 of the present invention. Detailed Embodiments

[0031] To further elaborate on the methods adopted and the effects achieved by the present invention, the technical solutions of the present invention will be clearly and completely described below in combination with experiments.

[0032] Example 1: A carbon dioxide adsorbent based on silver metal-organic framework, characterized in that the carbon dioxide adsorbent is obtained by compounding 2-aminoethanesulfonic acid and silver metal-organic framework in a mass ratio of 1:1, and the silver metal-organic framework is prepared from bimetallic framework, deionized water, silver nitrate, and 0.1 M sodium borohydride in a ratio of 200 mg:10 mL:5 mg:2 mL.

[0033] A production method of a carbon dioxide adsorbent based on silver metal-organic framework, comprising the following steps:

[0034] S1. Synthesize the bimetallic framework;

[0035] Take zirconium nitrate hexahydrate, copper nitrate, 2-aminoterephthalic acid, N,N-dimethylformamide, and acetic acid in a ratio of 0.233 g:0.181 g:0.2 g:50 mL:10 mL, and perform a mixing treatment to obtain the bimetallic framework;

[0036] The method of mixing treatment includes: dissolving zirconium nitrate hexahydrate, copper nitrate, and 2-aminoterephthalic acid in N,N-dimethylformamide, and performing microwave radiation treatment for 25 min; then dropwise adding acetic acid, and then standing at 110°C for 22 h, centrifuging after natural cooling, and alternately washing with N,N-dimethylformamide and methanol 3 times, and drying in vacuum at 60°C for 9 h to obtain the bimetallic framework; the microwave radiation treatment is carried out at a temperature of 110°C and a microwave frequency of 2.45 GHz; the dropping speed of acetic acid is 0.5 mL / s;

[0037] S2. Prepare the silver metal-organic framework;

[0038] Take the bimetallic framework, deionized water, silver nitrate, and 0.1 M sodium borohydride; disperse the bimetallic framework in deionized water, add silver nitrate, stir for 2.5 h, then dropwise add sodium borohydride, react for 25 min, centrifuge and wash, and then dry in vacuum to obtain the silver metal-organic framework; the dropping speed of sodium borohydride is 0.3 mL / s;

[0039] S3. Modify with 2-aminoethanesulfonic acid;

[0040] First, modify the silver metal-organic framework. The modification method is as follows: Immerse the silver metal-organic framework in 3-aminopropyltriethoxysilane and continuously soak it at 65 °C for 3.5 h to complete the modification. According to a mass ratio of 1:1, take aminoethanesulfonic acid and the silver metal-organic framework, reflux the silver metal-organic framework and aminoethanesulfonic acid in ethanol at 75 °C for 6.5 hours, and then obtain the carbon dioxide adsorbent after centrifugal washing and vacuum drying.

[0041] The above centrifugal washing in S2 and S3 is as follows: Centrifuge at a speed of 400 rpm for 13 min, and then alternately wash with deionized water and ethanol. The temperature of the above vacuum drying is 75 °C and the drying time is 1.5 h.

[0042] Example 2: The difference between this example and Example 1 is that the microwave radiation treatment time is 20 minutes and the temperature is 100 °C.

[0043] Example 3: The difference between this example and Example 1 is that the microwave radiation treatment time is 30 minutes and the temperature is 120 °C.

[0044] Example 4: The difference between this example and Example 1 is that the static parameters in the mixing treatment are different, and it is left standing at 100 °C for 24 h.

[0045] Example 5: The difference between this example and Example 1 is that the static parameters in the mixing treatment are different, and it is left standing at 120 °C for 20 h.

[0046] Example 6: The difference between this example and Example 1 is that vacuum drying is carried out for 8 h in S1.

[0047] Example 7: The difference between this example and Example 1 is that vacuum drying is carried out for 8 h in S1.

[0048] Example 8: The difference between this example and Example 1 is that after stirring for 2 h in S2, sodium borohydride is added dropwise and the reaction is carried out for 20 min.

[0049] Example 9: The difference between this example and Example 1 is that after stirring for 3 h in S2, sodium borohydride is added dropwise and the reaction is carried out for 30 min.

[0050] Example 10: The difference between this example and Example 1 is that the dropping rate of sodium borohydride in S2 is 0.2 mL / s.

[0051] Example 11: The difference between this example and Example 1 is that the dropping rate of sodium borohydride in S2 is 0.4 mL / s.

[0052] Example 12: The difference between this example and Example 1 is that in S3, it is continuously soaked at 60 °C for 4 h.

[0053] Example 13: The difference between this example and Example 1 is that in S3, it is continuously soaked at 70 °C for 3 h.

[0054] Example 14: The difference between this example and Example 1 is that in S3, the silver metal-organic framework and 2-aminoethanesulfonic acid are refluxed in ethanol at 80 °C for 6 hours.

[0055] Example 15: The difference between this example and Example 1 is that in S3, the silver metal-organic framework and 2-aminoethanesulfonic acid are refluxed in ethanol at 70 °C for 7 hours.

[0056] Example 16: The difference between this example and Example 1 is that the above-mentioned centrifugal washing in S2 and S3 is as follows: centrifuging at a speed of 300 rpm for 15 min, and then alternately washing with deionized water and ethanol. The temperature of the above-mentioned vacuum drying is 70 °C, and the drying time is 2 h.

[0057] Example 17: The difference between this example and Example 1 is that the above-mentioned centrifugal washing in S2 and S3 is as follows: centrifuging at a speed of 500 rpm for 10 min, and then alternately washing with deionized water and ethanol. The temperature of the above-mentioned vacuum drying is 80 °C, and the drying time is 1 h.

[0058] Example 18: The difference between this example and Example 1 is that the silver metal-organic framework is prepared from a bimetallic framework, deionized water, silver nitrate, and sodium borohydride in a ratio of 200 mg: 13 mL: 5 mg: 2 mL.

[0059] Example 19: The difference between this example and Example 1 is that the silver metal-organic framework is prepared from a bimetallic framework, deionized water, silver nitrate, and sodium borohydride in a ratio of 220 mg: 10 mL: 5 mg: 2 mL.

[0060] Experimental Example: The description basis of this experimental example is the recording scheme in Example 1, aiming to clarify the actual application effect of the present invention.

[0061] Experimental Example: I. Performance tests were respectively carried out on the carbon dioxide adsorbents obtained in Examples 1 to 17. The performance tests include:

[0062] ① Cyclic adsorption-desorption stability test (in a fixed-bed or fluidized-bed system, simulating actual working conditions for 5 adsorption-desorption cycles, and recording the CO2 adsorption capacity and desorption efficiency of each cycle);

[0063] ② Resistance to environmental interference (testing the performance attenuation of the adsorbent in industrial waste gas containing SO2, adsorbing in an environment containing 10% by volume of SO2, and recording the percentage decrease in the adsorption amount);

[0064] ③ Energy-saving performance (filling the adsorbent into a transparent quartz tube, introducing simulated flue gas containing CO2, recording the breakthrough time and saturated adsorption capacity, irradiating with visible light with a wavelength of 420 nm during the desorption stage, recording the desorption time under light irradiation, and obtaining the percentage reduction in time);

[0065] The test results are as follows:

[0066] 1. Explore the influence of different treatment methods on the performance of carbon dioxide adsorbents;

[0067] Comparative Example 1: The difference from Example 1 is that both zirconium nitrate hexahydrate and copper nitrate in S1 are replaced with silver nitrate of equal mass, and the step of S2 is not carried out, and the obtained silver metal-organic framework is subjected to the operation treatment of S3.

[0068] Comparative Example 2: The difference from Example 1 is that only zirconium nitrate hexahydrate in S1 is replaced with silver nitrate of equal mass, and the step of S2 is not carried out, and the obtained silver metal-organic framework is subjected to the operation treatment of S3.

[0069] Comparative Example 3: The difference from Example 1 is that the step of S2 is not carried out, and the obtained metal-organic framework in S1 is directly subjected to the treatment of S3.

[0070] Comparative Example 4: The difference from Example 1 is that the step of S3 is not carried out, and the silver metal-organic framework obtained in S2 is directly used as a carbon dioxide adsorbent.

[0071] Comparative Example 5: The difference from Example 1 is that in S3, the immersion treatment with 3-aminopropyltriethoxysilane is not carried out.

[0072] Take Example 1 and Comparative Examples 1-5 for comparison, as shown in Table 1;

[0073] Table 1 Experimental results of performance tests of carbon dioxide adsorbents under different treatment methods

[0074]

[0075] As can be seen from Table 1, by comparing Example 1 and Comparative Example 1, it can be seen that the method of preparing a carbon dioxide adsorbent by using the method of double metal + silver metal coordination in Example 1 is more preferable. In Comparative Example 1, after replacing both zirconium nitrate hexahydrate and copper nitrate in S1 with silver nitrate of equal mass, the lack of synergistic effect between metals makes it impossible to form a heterostructure jointly with Zr, Cu metal nodes and Ag, enhance the framework stability, and thus improve the adsorption performance.

[0076] Comparing Example 1 with Comparative Example 2, it can be seen that compared with Comparative Example 2 where only zirconium nitrate hexahydrate in S1 was replaced with an equal mass of silver nitrate, the preparation method in Example 1 is more preferable. The reason may be that the high coordination ability of Zr ions and the bimetallic synergistic effect are the core advantages of the original method, while the chemical properties of Ag ions (such as reducibility and low coordination number) make it difficult to replace Zr.

[0077] Comparing Example 1 with Comparative Example 3, it can be found that the raw materials and preparation method in Example 1 are more preferable. Although a bimetallic organic framework was formed in Comparative Example 2 through step S1, due to the lack of coordination of silver metal, the chemical activity of the material decreased and the number of active sites was small, thereby reducing the carbon dioxide adsorption effect and having poor regeneration ability at the same time.

[0078] Comparing Example 1 with Comparative Example 4, it can be seen that the performance of the silver metal organic framework directly used as a carbon dioxide adsorbent without aminoethanesulfonic acid modification in Comparative Example 4 is lower than that in Example 1. This may be because the unmodified silver metal organic framework has shortcomings in terms of adsorption capacity, selectivity, energy consumption, environmental stability, and cycle life. The modification with aminoethanesulfonic acid effectively makes up for these defects by introducing polar groups, optimizing the pore chemical environment, and enhancing the photothermal response, resulting in improved performance in various aspects.

[0079] Comparing Example 1 with Comparative Example 5, it can be seen that the silver metal organic framework after being soaked in 3-aminopropyltriethoxysilane in Example 1 is more preferable. This may be because the amino group forms a coordination bond with the metal nodes of the silver metal organic framework, providing stable anchoring sites, enabling the subsequent sulfonic acid group and amino group of aminoethanesulfonic acid to bind directionally, avoiding pore blockage caused by random distribution. Through chemical bonding, deep modification, and synergistic effects, while maintaining the pore structure of the metal organic framework, the adsorption capacity and cycle stability are significantly improved, while the immersion method is prone to performance decay due to insufficient reaction and low bonding strength.

[0080] 2. Explore the influence of different parameters on the performance of the carbon dioxide adsorbent;

[0081] Take Examples 1 - 19 for comparison, as shown in Table 2;

[0082] Table 2 Experimental results of the performance test of the carbon dioxide adsorbent under different treatment parameters

[0083]

[0084]

[0085] As can be seen from Table 2, by comparing Comparative Example 1, Comparative Example 1, Example 2 and Example 3, it can be found that the microwave radiation parameters of Example 1 are more preferable. This may be because the processing time in Example 1 can accurately control the reaction process and form a coordination structure; by comparing Comparative Example 1, Example 4 and Example 5, it can be found that the static parameters in the mixed treatment of Example 1 are more preferable. By comparing Comparative Example 1, Example 6 and Example 7, it can be found that the vacuum drying parameters of Example 1 are more preferable. By comparing Comparative Example 1, Example 8 and Example 9, it can be found that the stirring parameters are more preferable; by comparing Comparative Example 1, Example 10 and Example 11, it can be found that the reduction rate of sodium borohydride in Example 1 is more preferable. By comparing Comparative Example 1, Example 12 and Example 13, it can be found that the soaking parameters of Example 1 are more preferable. By comparing Example 14 and Example 15, it can be found that the reflux parameters in Example 1 are more preferable. By comparing Comparative Example 1, Example 18 and Example 19, it can be found that the raw material component ratio of the silver metal-organic framework in Example 1 is more preferable.

Claims

1. A carbon dioxide adsorbent based on silver metal-organic framework, characterized in that, The carbon dioxide adsorbent is obtained by compounding aminoethanesulfonic acid and silver metal-organic framework with a mass ratio of 1:

1. The silver metal-organic framework is prepared from bimetallic framework, deionized water, silver nitrate, and 0.1 M sodium borohydride in a ratio of 200-220 mg:10-13 mL:5 mg:2 mL.

2. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 1, characterized in that, It includes the following steps: S1. Synthesize the bimetallic framework; Take zirconium nitrate hexahydrate, copper nitrate, 2-aminoterephthalic acid, N,N-dimethylformamide, and acetic acid in a ratio of 0.233 g:0.181 g:0.2 g:50 mL:10 mL, and perform mixing treatment to obtain the bimetallic framework; S2. Prepare the silver metal-organic framework; Take the bimetallic framework, deionized water, silver nitrate, and sodium borohydride; disperse the bimetallic framework in deionized water, add silver nitrate, stir for 2-3 h, then gradually add sodium borohydride dropwise, react for 20-30 min, centrifuge and wash, and then vacuum dry to obtain the silver metal-organic framework; S3. Modify with aminoethanesulfonic acid; Take aminoethanesulfonic acid and silver metal-organic framework in a mass ratio of 1:1, reflux the silver metal-organic framework and aminoethanesulfonic acid in ethanol at a temperature of 70-80 °C for 6-7 hours, and then obtain the carbon dioxide adsorbent after centrifuging, washing, and vacuum drying.

3. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 2, characterized in that, The method of the mixing treatment in S1 includes: Dissolve zirconium nitrate hexahydrate, copper nitrate, and 2-aminoterephthalic acid in N,N-dimethylformamide, and perform microwave radiation treatment for 20-30 minutes; then gradually add acetic acid dropwise, and then stand at 100-120 °C for 20-24 h, naturally cool, centrifuge, and wash alternately with N,N-dimethylformamide and methanol 3 times, and vacuum dry at 60 °C for 8-10 h to obtain the bimetallic framework.

4. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 3, characterized in that, The temperature of the microwave radiation treatment is 100-120 °C, and the microwave frequency is 2.45 GHz.

5. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 3, characterized in that, The dropping rate of acetic acid in S1 is 0.5 mL / s, and the dropping rate of sodium borohydride in S2 is 0.2-0.4 mL / s.

6. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 3, characterized in that, The centrifuging and washing in S2 and S3 are: centrifuge at a rotation speed of 300-500 rpm for 10-15 min, and then wash alternately with deionized water and ethanol.

7. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 3, characterized in that, The temperature of the vacuum drying in S2 and S3 is 70-80 °C, and the drying time is 1-2 h.

8. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 1, characterized in that, In S3, the silver metal-organic framework is first modified and then refluxed with aminoethanesulfonic acid.

9. The production method of a carbon dioxide adsorbent based on silver metal-organic framework according to claim 8, characterized in that, The modification method is: soak the silver metal-organic framework in 3-aminopropyltriethoxysilane, and continuously soak at a temperature of 60-70 °C for 3-4 h to complete the modification.

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