A metal-organic framework material-enhanced carbon dioxide capture solvent and preparation method thereof

Abstract

The present invention proposes a novel metal-organic framework material-enhanced carbon dioxide capture solvent and a preparation method thereof, relating to the field of gas adsorbents. The method comprises the following steps: S1, dissolving nickel salt, cobalt salt and zinc salt in water to obtain a metal salt solution; S2, mixing 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide, then adding 1-methylimidazole and ethanol, and mixing evenly to obtain a ligand solution; S3, mixing the metal salt solution with the ligand solution, adding the mixture to a microwave reactor for reaction, filtering, drying, and obtaining an organic framework material; S4, dispersing the organic framework material in deionized water, then adding an organic amine aqueous solution and a silane coupling agent, stirring evenly, then adding an imidazole ionic liquid, and ultrasonically vibrating to obtain the obtained product. The carbon dioxide capture solvent uses the metal-organic framework material as a carrier, functionally modifies the metal-organic framework material, and combines it with the imidazole ionic liquid to improve the adsorption efficiency and stability of the capture solvent.

Description

Technical Field

[0001] The present invention relates to the field of gas adsorbents, and in particular to a metal-organic framework material-enhanced carbon dioxide capture solvent and a preparation method thereof. Background Art

[0002] Carbon capture technology refers to a series of techniques and methods designed to reduce atmospheric CO2 concentrations and is a key component of carbon capture, utilization, and storage (CCUS). Common carbon dioxide capture methods include absorption, membrane separation, and physical adsorption. Adsorption is further divided into physical adsorption and chemical adsorption. Physical adsorption utilizes the adsorption function of porous structures to capture carbon dioxide gas, while chemical adsorption utilizes active sites on the surface of the adsorbent material to bind to carbon dioxide, thereby securing it on the adsorbent. Physical adsorption has poor gas selectivity, but the physical adsorbent has a high reuse rate. While chemical adsorption has high gas selectivity, the cost of reusing the adsorbent material is high.

[0003] Metal-organic frameworks (MOFs) are crystalline materials with three-dimensional network structures composed of metal ions or metal clusters and organic ligands connected by coordination bonds. Due to their high tunability, porosity, and large specific surface area, MOFs are ideal carbon dioxide adsorption materials. Their porous structure is capable of adsorbing carbon dioxide molecules through two main adsorption mechanisms: physical adsorption and chemical adsorption, resulting in MOFs' excellent performance in carbon dioxide capture. However, in practical applications, MOFs can be affected by complex and variable environmental conditions, potentially compromising their structural stability. Factors such as humidity and temperature can cause structural changes in MOFs, thereby affecting their capture performance.

[0004] Patent 201811361501.7 discloses a method for modifying metal-organic framework materials and their applications. This method uses carbonyl, amino, and nitrogen groups to in situ modify the metal nodes of the metal-organic framework material. This method enhances the hydrophobicity and water vapor resistance of the porous organic framework adsorbent material, making it suitable for the capture and adsorption separation of weakly adsorbed mixed components at a certain humidity. Patent 201810536691.5 discloses an organic amine-loaded metal-organic framework-porous polymer composite material, its preparation method, and its applications. The organic amine is chemically bonded to the porous polymer pore wall surface and chemically or coordinately bonded to the metal-organic framework material surface. This composite material exhibits advantages such as high CO2 adsorption capacity, rate, and selectivity, fast desorption rate, high adsorption-desorption cycle stability, and excellent high temperature and water vapor tolerance.

[0005] The prior art disclosed in the organic metal framework (OMF) materials improves carbon dioxide adsorption by modifying their molecular structure through the grafting of functional groups. While grafting functional groups can improve adsorption performance, the stability of the material still needs to be improved. Summary of the Invention

[0006] The purpose of the present invention is to provide a metal-organic framework material-enhanced carbon dioxide capture solvent, which uses the metal-organic framework material as a carrier, functionalizes it, and combines it with an imidazolium ionic liquid to improve the adsorption efficiency and stability of the capture solvent.

[0007] Another object of the present invention is to provide a method for preparing a metal organic framework material enhanced carbon dioxide capture solvent, wherein the capture solvent prepared by this method has excellent adsorption performance and stability.

[0008] The present invention solves the technical problem by adopting the following technical solutions.

[0009] In one aspect, an embodiment of the present invention provides a metal-organic framework material-enhanced carbon dioxide capture solvent, comprising the following steps:

[0010] S1, dissolving nickel salt, cobalt salt and zinc salt in water to obtain a metal salt solution;

[0011] S2, mixing 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide, then adding 1-methylimidazole and ethanol, and mixing well to obtain a ligand solution;

[0012] S3, mixing the metal salt solution and the ligand solution, adding the mixture to a microwave reactor for reaction, filtering, and drying to obtain an organic framework material;

[0013] S4, dispersing the organic framework material in deionized water, adding an organic amine aqueous solution and a silane coupling agent, stirring evenly, adding an imidazole ionic liquid, and ultrasonically shaking to obtain the product.

[0014] In some embodiments of the present invention, the nickel salt is nickel nitrate or nickel acetate, the cobalt salt is cobalt nitrate or cobalt acetate, and the zinc salt is zinc nitrate or zinc acetate.

[0015] In some embodiments of the present invention, in step S3, the temperature of the microwave reaction is 110-130° C., and the reaction time is 10-20 min.

[0016] In some embodiments of the present invention, the organic amine is a mixture of one or more of polyethyleneimine, ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, diethylenetriamine, triethylenetetramine, diethanolamine, diisopropylamine, 2-methylaminoethanol, and 2-ethylaminoethanol.

[0017] In some embodiments of the present invention, the silane coupling agent is one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-glycidoxypropyltrimethoxysilane.

[0018] In some embodiments of the present invention, in step S4, the frequency of ultrasonic oscillation is 50-60 KHz, and the duration is 30-40 minutes.

[0019] In some embodiments of the present invention, the imidazolium ionic liquid is one of 1,2,3,4,5-pentamethylimidazolium tetracyanoborate, 1,3-ethyl-2,4,5-methylimidazolium tetracyanoborate, 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate.

[0020] In some embodiments of the present invention, in step S4, the mass ratio of the organic framework material to the organic amine is 1:(1-2).

[0021] In some embodiments of the present invention, in step S4, the mass ratio of the organic framework material to the imidazole ionic liquid is 1:(1-2).

[0022] On the other hand, an embodiment of the present invention provides a metal-organic framework material-enhanced carbon dioxide capture solvent prepared by the above method.

[0023] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0024] The preparation method of the carbon dioxide capture solvent provided by the present invention uses metal nickel, cobalt and zinc raw materials and corresponding organic ligands to make a porous organic framework material with a high specific surface area and micropore capacity. Secondly, the nickel and cobalt metals can form metal unsaturated bonds, further improving the adsorption capacity of carbon dioxide. Secondly, the organic framework material is mixed with an organic amine solution. Under the action of a coupling agent, the nitrogen-containing groups in the organic amine can be grafted onto the organic framework material, which can further increase the adsorption capacity of carbon dioxide. Thirdly, imidazolium ionic liquid has the advantages of stability, low volatility, large absorption capacity and low viscosity. Combining the modified metal organic framework material with the imidazolium ionic liquid makes the carbon dioxide capture agent have the advantages of good stability and high adsorption capacity. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0027] The present invention provides a metal organic framework material enhanced carbon dioxide capture solvent, comprising the following steps:

[0028] S1, dissolving a nickel salt, a cobalt salt and a zinc salt in water to obtain a metal salt solution; the nickel salt is nickel nitrate or nickel acetate, the cobalt salt is cobalt nitrate or cobalt acetate, and the zinc salt is zinc nitrate or zinc acetate.

[0029] S2, mixing 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide, then adding 1-methylimidazole and ethanol, and mixing well to obtain a ligand solution;

[0030] S3, mixing the metal salt solution and the ligand solution, adding the mixture into a microwave reactor for reaction, filtering, and drying to obtain an organic framework material; the microwave reaction temperature is 110-130° C., and the reaction time is 10-20 min.

[0031] S4. Disperse the organic framework material in deionized water, add an organic amine aqueous solution and a silane coupling agent, stir evenly, add an imidazole ionic liquid, and ultrasonically vibrate to obtain the product. The ultrasonic vibration frequency is 50-60 kHz, and the duration is 30-40 minutes. The mass ratio of the organic framework material to the organic amine is 1:(1-2). The mass ratio of the organic framework material to the imidazole ionic liquid is 1:(1-2).

[0032] The organic amine is a mixture of one or more of polyethyleneimine, ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, diethylenetriamine, triethylenetetramine, diethanolamine, diisopropylamine, 2-methylaminoethanol, and 2-ethylaminoethanol. The silane coupling agent is one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-glycidoxypropyltrimethoxysilane. The imidazole ionic liquid is one of 1,2,3,4,5-pentamethylimidazolium tetracyanoborate, 1,3-ethyl-2,4,5-methylimidazolium tetracyanoborate, 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate.

[0033] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0034] Example 1

[0035] The carbon dioxide capture solvent of this embodiment was prepared according to the following steps:

[0036] S1, dissolving nickel nitrate, cobalt nitrate and zinc nitrate in water to obtain a metal salt solution, wherein the mass fractions of nickel nitrate, cobalt nitrate and zinc nitrate in the metal salt solution are all 10%;

[0037] S2, 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide were mixed in a mass ratio of 1:1, and then an equal amount of 1-methylimidazole and an equal amount of ethanol were added and mixed to obtain a ligand solution;

[0038] S3, mixing the metal salt solution and the ligand solution, adding the mixture into a microwave reactor, heating the microwave reactor to 120°C at a power of 100W, reacting for 20 minutes, and then filtering and drying to obtain an organic framework material;

[0039] S4, dispersing the organic framework material in deionized water, adding polyethyleneimine and γ-aminopropyltriethoxysilane, stirring evenly, then adding 1,2,3,4,5-pentamethylimidazolium tetracyanoborate, and ultrasonically oscillating at a frequency of 50 kHz for 30 minutes to obtain the carbon dioxide capture solvent of this embodiment. The mass ratio of the organic framework material to the polyethyleneimine is 1:1, and the mass ratio of the organic framework material to the 1,2,3,4,5-pentamethylimidazolium tetracyanoborate is 1:1.5.

[0040] Example 2

[0041] The carbon dioxide capture solvent of this embodiment was prepared according to the following steps:

[0042] S1, dissolving nickel acetate, cobalt acetate and zinc acetate in water to obtain a metal salt solution; wherein the mass fraction of nickel acetate, cobalt acetate and zinc acetate in the metal salt solution is 10%.

[0043] S2, 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide were mixed in a mass ratio of 1:1, and then an equal amount of 1-methylimidazole and an equal amount of ethanol were added and mixed to obtain a ligand solution;

[0044] S3, mixing the metal salt solution and the ligand solution, adding the mixture into a microwave reactor, heating the microwave reactor to 130°C at a power of 100W, reacting for 15 minutes, and then filtering and drying to obtain an organic framework material;

[0045] S4, dispersing the organic framework material in deionized water, then adding ethylenediamine and γ-aminopropyltrimethoxysilane, stirring evenly, then adding 1,3-ethyl-2,4,5-methylimidazolium tetracyanoborate, and ultrasonically oscillating at a frequency of 60 kHz for 30 minutes to obtain the carbon dioxide capture solvent of this embodiment. The mass ratio of the organic framework material to ethylenediamine is 1:1, and the mass ratio of the organic framework material to 1,3-ethyl-2,4,5-methylimidazolium tetracyanoborate is 1:1.5.

[0046] Example 3

[0047] The carbon dioxide capture solvent of this embodiment was prepared according to the following steps:

[0048] S1. Dissolving nickel nitrate, cobalt acetate, and zinc nitrate in water to obtain a metal salt solution; in the metal salt solution, the mass fraction of nickel nitrate, cobalt acetate, and zinc nitrate is 10%.

[0049] S2, 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide were mixed in a mass ratio of 1:1, and then an equal amount of 1-methylimidazole and an equal amount of ethanol were added and mixed to obtain a ligand solution;

[0050] S3, mixing the metal salt solution and the ligand solution, adding the mixture into a microwave reactor, heating the microwave reactor to 110°C at a power of 100W, reacting for 20 minutes, and then filtering and drying to obtain an organic framework material;

[0051] S4, dispersing the organic framework material in deionized water, then adding 1,3-propylenediamine and γ-glycidyloxypropyltrimethoxysilane, stirring evenly, then adding 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate, and ultrasonically oscillating at a frequency of 60 kHz for 40 minutes to obtain the carbon dioxide capture solvent of this embodiment. The mass ratio of the organic framework material to 1,3-propylenediamine is 1:1, and the mass ratio of the organic framework material to 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate is 1:1.5.

[0052] Example 4

[0053] The carbon dioxide capture solvent of this embodiment was prepared according to the following steps:

[0054] S1, dissolving nickel nitrate, cobalt nitrate and zinc nitrate in water to obtain a metal salt solution, wherein the mass fractions of nickel nitrate, cobalt nitrate and zinc nitrate in the metal salt solution are all 10%;

[0055] S2, 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide were mixed in a mass ratio of 1:1, and then an equal amount of 1-methylimidazole and an equal amount of ethanol were added and mixed to obtain a ligand solution;

[0056] S3, mixing the metal salt solution and the ligand solution, adding the mixture into a microwave reactor, heating the microwave reactor to 120°C at a power of 100W, reacting for 20 minutes, and then filtering and drying to obtain an organic framework material;

[0057] S4, dispersing the organic framework material in deionized water, adding diethylenetriamine and γ-glycidyloxypropyltrimethoxysilane, stirring evenly, adding 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate, and ultrasonically vibrating at a frequency of 60KHz for 35 minutes to obtain the carbon dioxide capture solvent of the embodiment. The mass ratio of the organic framework material to diethylenetriamine is 1:1, and the mass ratio of the organic framework material to 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate is 1:1.5.

[0058] Example 5

[0059] The carbon dioxide capture solvent of this embodiment was prepared according to the following steps:

[0060] S1. Dissolving nickel acetate, cobalt nitrate, and zinc nitrate in water to obtain a metal salt solution; the mass fraction of nickel acetate, cobalt nitrate, and zinc nitrate in the metal salt solution is 10%.

[0061] S2, 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide were mixed in a mass ratio of 1:1, and then an equal amount of 1-methylimidazole and an equal amount of ethanol were added and mixed to obtain a ligand solution;

[0062] S3, mixing the metal salt solution and the ligand solution, adding the mixture into a microwave reactor, heating the microwave reactor to 110°C at a power of 100W, reacting for 20 minutes, and then filtering and drying to obtain an organic framework material;

[0063] S4, dispersing the organic framework material in deionized water, adding diethanolamine and γ-aminopropyltrimethoxysilane, stirring evenly, and then adding 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate, and ultrasonically oscillating at a frequency of 50 kHz for 30 minutes to obtain the carbon dioxide capture solvent of this embodiment. The mass ratio of the organic framework material to diethanolamine is 1:1, and the mass ratio of the organic framework material to 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate is 1:1.5.

[0064] Example 6

[0065] The difference from Example 1 is that in step S4 of this embodiment, the mass ratio of the organic framework material to polyethyleneimine is 1:1.5, and the mass ratio of the organic framework material to 1,2,3,4,5-pentamethylimidazolium tetracyanoborate is 1:1. The remaining raw materials, proportions and preparation methods are the same as those of Example 1.

[0066] Example 7

[0067] The difference from Example 1 is that in this embodiment, in step S4 of this embodiment, the mass ratio of the organic framework material to polyethyleneimine is 1:2, and the mass ratio of the organic framework material to 1,2,3,4,5-pentamethylimidazolium tetracyanoborate is 1:2. The remaining raw materials, proportions and preparation methods are the same as those of Example 1.

[0068] Example 8

[0069] The difference from Example 1 is that in step S4 of this embodiment, the organic amine solution added is a mixture of polyethyleneimine and diethanolamine in a mass ratio of 1:1; the remaining raw materials, proportions and preparation methods are the same as those of Example 1.

[0070] Example 9

[0071] The difference from Example 1 is that, in this embodiment, in step S4 of this embodiment, the organic amine solution added is a mixture of ethylenediamine and 2-ethylaminoethanol in a mass ratio of 1:1; the remaining raw materials, proportions and preparation methods are the same as those of Example 1.

[0072] Example 10

[0073] The difference from Example 8 is that in step S4 of this embodiment, the imidazole ionic liquid is a mixture of 1,2,3,4,5-pentamethylimidazolium tetracyanoborate and 1,3-ethyl-2,4,5-methylimidazolium tetracyanoborate, and the mass ratio of the two is 1:1.

[0074] Comparative Example 1

[0075] The difference from Example 1 is that in this comparative example, steps S1-S3 are not performed. In step S4, ZIF-8 is directly used as a raw material and dispersed in deionized water. Then, polyethyleneimine and γ-aminopropyltriethoxysilane are added and stirred evenly. Then, 1,2,3,4,5-pentamethylimidazolium tetracyanoborate is added, and ultrasonic oscillation is performed at a frequency of 50 kHz and a time of 30 min to obtain the carbon dioxide capture solvent of this comparative example.

[0076] Comparative Example 2

[0077] The difference from Example 1 is that in this comparative example:

[0078] S1, dissolving nickel nitrate and cobalt nitrate in water to obtain a metal salt solution, wherein the mass fractions of nickel nitrate, cobalt nitrate and zinc nitrate in the metal salt solution are all 10%;

[0079] S2, mixing 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide in a mass ratio of 1:1 to obtain a ligand solution;

[0080] The remaining steps and raw material ratios are the same as those in Example 1.

[0081] Comparative Example 3

[0082] The difference from Example 1 is that in step S4 of this comparative example, polyethyleneimine and γ-aminopropyltriethoxysilane are not added, and the remaining steps and raw material ratios are the same as those of Example 1.

[0083] Comparative Example 4

[0084] The difference from Example 1 is that in step S4 of this comparative example, 1,2,3,4,5-pentamethylimidazolium tetracyanoborate is not added, and the remaining steps and raw material ratios are the same as those of Example 1.

[0085] Experimental example

[0086] 1. The carbon dioxide capture solvents of Examples 1-5, 8-10 and Comparative Examples 1-4 were used as test objects, and the adsorption performance of each carbon dioxide capture solvent for carbon dioxide was tested according to the following method.

[0087] Each CO2 capture solvent was added to a 10ml glass container with an inner diameter of 2cm (5ml). The container was heated in a water bath at 40°C. Carbon dioxide gas was then introduced into the container at a rate of 20ml / min and a pressure of 0.1MPa for 2 hours. The container was weighed before and after capture using an analytical balance. The difference in mass before and after capture was the amount of CO2 captured. The results are shown in Table 1.

[0088] 2. Each CO2 capture solvent was added to a 10ml glass container with an inner diameter of 2cm (5ml). The container was heated in a water bath at 90°C. Carbon dioxide gas was then introduced into the container at a rate of 20ml / min and a pressure of 0.1MPa for 2 hours. The container was weighed before and after capture using an analytical balance. The difference in mass before and after capture was the amount of CO2 captured. The results are shown in Table 1.

[0089] Table 1

[0090]

[0091] It can be concluded from Table 1 that the carbon dioxide capture solvent prepared in the examples provided by the present invention has a relatively high adsorption capacity for carbon dioxide at both 40°C and 90°C.

[0092] In summary, the preparation method of the carbon dioxide capture solvent provided by the present invention uses metal nickel, cobalt and zinc raw materials and corresponding organic ligands to make a porous organic framework material with a high specific surface area and micropore capacity. Secondly, nickel and cobalt metals can form metal unsaturated bonds, further improving the adsorption capacity of carbon dioxide. Secondly, the organic framework material is mixed with an organic amine solution. Under the action of a coupling agent, the nitrogen-containing groups in the organic amine can be grafted onto the organic framework material, which can further increase the adsorption capacity of carbon dioxide. Thirdly, imidazolium ionic liquid has the advantages of stability, low volatility, large absorption capacity and low viscosity. Combining the modified metal organic framework material with the imidazolium ionic liquid makes the carbon dioxide capture agent have the advantages of good stability and high adsorption capacity.

[0093] The embodiments described above are some, but not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

Claims

1. A method for preparing a metal organic framework material enhanced carbon dioxide capture solvent, characterized in that: The following steps are involved: S1, dissolving nickel salt, cobalt salt and zinc salt in water to obtain a metal salt solution; S2, mixing 2,5-dihydroxyterephthalic acid and N,N-dimethylformamide, then adding 1-methylimidazole and ethanol, and mixing well to obtain a ligand solution; S3, mixing the metal salt solution and the ligand solution, adding the mixture to a microwave reactor for reaction, wherein the microwave reaction temperature is 110-130° C. and the reaction time is 10-20 min; Filtering and drying to obtain an organic framework material; S4, dispersing the organic framework material in deionized water, adding an organic amine aqueous solution and a silane coupling agent, stirring evenly, adding an imidazole ionic liquid, and ultrasonically oscillating to obtain; the frequency of the ultrasonic oscillation is 50-60 kHz, and the time is 30-40 minutes; the mass ratio of the organic framework material to the imidazole ionic liquid is 1: (1-2), and the mass ratio of the organic framework material to the organic amine is 1: (1-2).

2. The method for preparing a metal organic framework-enhanced carbon dioxide capture solvent according to claim 1, characterized in that: The nickel salt is nickel nitrate or nickel acetate, the cobalt salt is cobalt nitrate or cobalt acetate, and the zinc salt is zinc nitrate or zinc acetate.

3. The method for preparing a metal-organic framework-enhanced carbon dioxide capture solvent according to claim 1, wherein: The organic amine is a mixture of one or more of polyethyleneimine, ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, diethylenetriamine, triethylenetetramine, diethanolamine, diisopropylamine, 2-methylaminoethanol, and 2-ethylaminoethanol.

4. The method for preparing a metal organic framework-enhanced carbon dioxide capture solvent according to claim 1, wherein: The silane coupling agent is one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane and γ-glycidoxypropyltrimethoxysilane.

5. The method for preparing a metal organic framework-enhanced carbon dioxide capture solvent according to claim 1, wherein: The imidazolium ionic liquid is one of 1,2,3,4,5-pentamethylimidazolium tetracyanoborate, 1,3-ethyl-2,4,5-methylimidazolium tetracyanoborate, 1-ethyl-3-propyl-2,4,5-methylimidazolium tetracyanoborate, and 1-ethyl-2,4,5-trimethyl-3-pentylimidazolium tetracyanoborate.

6. A metal organic framework material enhanced carbon dioxide capture solvent, characterized in that: Prepared by the method according to any one of claims 1 to 5.

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