CN114307995A - Preparation method and application of composite material for capturing carbon dioxide - Google Patents
Preparation method and application of composite material for capturing carbon dioxide Download PDFInfo
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- CN114307995A CN114307995A CN202210095477.7A CN202210095477A CN114307995A CN 114307995 A CN114307995 A CN 114307995A CN 202210095477 A CN202210095477 A CN 202210095477A CN 114307995 A CN114307995 A CN 114307995A
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Abstract
The invention provides a preparation method and application of a composite material for capturing carbon dioxide, wherein the preparation method comprises the following steps: s1, preparing a glacial acetic acid mixed solution containing the polyaldehyde and the nitrogen-containing heterocyclic compound; s2, stirring the mixed solution at room temperature under protective gas, adding ferric trichloride, continuously stirring to obtain an organic polymer precursor solution, placing the organic polymer precursor solution in a hydrothermal reaction kettle, and heating for reaction to obtain an organic polymer reaction solution; s3, cooling the organic polymer reaction solution, washing and drying to obtain an organic polymer; s4, preparing an ethyl acetate mixed solution containing divinylbenzene and azobisisobutyronitrile; and S5, grinding the organic polymer, placing the ground organic polymer in a hydrothermal reaction kettle, adding the ethyl acetate mixed solution, heating for reaction, taking out, cooling and drying to obtain the composite material. The composite material prepared by the invention has better hydrophobic property, is used for capturing carbon dioxide in a water vapor environment, and reduces the influence on water vapor in the process of capturing carbon dioxide in flue gas.
Description
Technical Field
The invention belongs to the field of carbon dioxide capture materials, and particularly relates to a preparation method and application of a composite material for capturing carbon dioxide.
Background
China has become the largest carbon dioxide discharging country in the world at present, and the specific resource endowments of 'more coal, less oil, gas shortage and depleted uranium' determine that the dual targets of social and economic development and carbon dioxide emission reduction are difficult to realize at the same time by only adjusting energy consumption and industrial structure. The coal chemical industry process is an important carbon dioxide emission source, and the research and development of a new technology for targeted carbon dioxide recovery and resource utilization are urgently needed to be carried out, so that the energy conservation, consumption reduction and transformation upgrading of the traditional high-carbon industry of the coal chemical industry are driven, and a new economic benefit growth point is formed for related enterprises. In the new technical system, the low-cost separation and recovery of carbon dioxide in the coal chemical industry process is the first step.
The carbon dioxide capture means that the separation and enrichment of carbon dioxide are realized by different technical means from industrial emission sources or directly from the atmosphere, so as to obtain high-purity carbon dioxide which is supplied to downstream for utilization and sequestration. Currently, carbon dioxide capture mainly comprises four implementation strategies: pre-combustion capture, oxyfuel combustion, post-combustion capture, and direct air capture, with post-combustion carbon capture technology being particularly urgent because the process is well suited for large stationary emissions sources such as thermoelectric, steel and ore smelting, and is almost the only current solution to large-scale emissions.
In the process of capturing after combustion, because the concentration of carbon dioxide in the flue gas is low, the partial pressure is small, the impurity components are complex, and particularly the water vapor content is high. When the conventional carbon dioxide capture material is used for capturing the flue gas after primary purification, water vapor in the flue gas can occupy the adsorption position of the carbon dioxide capture material, and the adsorption performance of the capture material on carbon dioxide is seriously influenced. Although a great deal of research on carbon dioxide capture materials is conducted by domestic and foreign staff, and a good carbon dioxide adsorption effect is achieved under the dry gas capture condition, few reports on the preparation of hydrophobic carbon dioxide capture materials are researched.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a preparation method and application of a composite material for capturing carbon dioxide, which are used for solving the problem that when the carbon dioxide capturing material in the prior art captures flue gas, the adsorption sites of the carbon dioxide capturing material are occupied by water vapor in the flue gas, so that the adsorption performance of the capturing material on carbon dioxide is low.
To achieve the above and other related objects, the present invention provides a method for preparing a composite material for carbon dioxide capture, the method comprising the steps of:
s1, dissolving the polybasic aldehyde and the nitrogen-containing heterocyclic compound in glacial acetic acid to prepare a mixed solution;
s2, stirring the mixed solution at room temperature for a period of time under protective gas, then adding ferric trichloride, continuously stirring to obtain an organic polymer precursor solution, placing the organic polymer precursor solution in a hydrothermal reaction kettle, and heating for reaction to obtain an organic polymer reaction solution;
s3, cooling the organic polymer reaction solution, washing the organic polymer reaction solution for multiple times by using water and an organic solvent, and placing the organic polymer reaction solution in a vacuum drying oven for drying to obtain an organic polymer;
s4, adding divinylbenzene and azobisisobutyronitrile into the ethyl acetate solution, and stirring at room temperature to obtain an ethyl acetate mixed solution;
s5, grinding the organic polymer obtained in the step S3, placing the ground organic polymer in a hydrothermal reaction kettle, adding the ethyl acetate mixed solution obtained in the step S4, heating for reaction for a period of time, taking out, cooling and drying to obtain the composite material.
Preferably, the polyaldehyde in step S1 is one or a combination of isophthalaldehyde, terephthalaldehyde and trimeldehyde.
Preferably, the nitrogen-containing heterocyclic compound in step S1 is one or a combination of pyrrole, pyridine, imidazole and quinoline.
Preferably, the concentration of the polyaldehyde in the mixed solution in the step S1 is 0.05-1 mol/L; in the step S1, the concentration of the nitrogen-containing heterocyclic compound in the mixed solution is 0.05-1 mol/L.
Preferably, the mixed solution in the step S2 is stirred for 0.1-1 h at room temperature under protective gas, and then ferric trichloride is added and stirring is continued for 1-12 h.
Preferably, the protective gas in step S2 is one or a combination of helium, argon, and nitrogen.
Preferably, the temperature of the heating reaction in the step S2 is 120-240 ℃, and the time of the heating reaction is 24-120 h.
Preferably, the ratio of the mole number of the ferric trichloride added in the step S2 to the volume of the glacial acetic acid in the step S1 is 0.01-0.2 mol/L.
Preferably, the organic solvent in step S3 includes one or a combination of methanol, ethanol, acetone, tetrahydrofuran and chloroform.
Preferably, the washing in step S3 is at least one washing with at least one of water and the organic solvent in sequence.
Preferably, the temperature of the vacuum drying oven in the step S3 is 60-120 ℃, and the drying time is 6-24 h.
Preferably, divinylbenzene in step S4 is one or a combination of m-phenylenediethylene and p-phenylenediethylene.
Preferably, the stirring time at room temperature in the step S4 is 0.5-6 h.
Preferably, the concentration of divinylbenzene in the ethyl acetate mixed solution in the step S4 is 0.02-1 g/mL; in the step S4, the concentration of the azobisisobutyronitrile in the ethyl acetate mixed solution is 0.001-0.01 g/mL.
Preferably, the temperature of the heating reaction in the step S5 is 75-150 ℃.
Preferably, the heating reaction time in the step S5 is 12-48 h.
Preferably, the drying method in step S5 includes one of natural evaporation, vacuum drying, and drying at 40-80 ℃.
The invention also provides an application of the composite material prepared by the preparation method in carbon dioxide capture.
As described above, the preparation method and application of the composite material for carbon dioxide capture of the present invention have the following beneficial effects:
the invention provides a preparation method of a composite material for capturing carbon dioxide, which is simple, the prepared composite material is porous and has better hydrophobic property, and the composite material can be used for capturing carbon dioxide in a water vapor environment, so that the influence on water vapor in the process of capturing carbon dioxide in flue gas is reduced, and the problem of reduced adsorption property on carbon dioxide caused by the fact that water vapor in the flue gas occupies the adsorption site of the carbon dioxide capturing material when the flue gas is captured in the prior art is effectively solved.
Drawings
FIG. 1 shows a camera shot of the composite material prepared in example 1 of the present invention.
Fig. 2 shows a photograph taken with a camera in which the composite prepared in example 1 of the present invention was contacted with water droplets.
FIG. 3 shows a photograph taken with a camera of the composite material prepared in example 1 of the present invention placed in a beaker containing deionized water.
FIG. 4 is an SEM photograph of the porous polymer prepared in comparative example 1 of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1 to 4, the invention provides a preparation method of a composite material for capturing carbon dioxide, which is simple, the prepared composite material is porous and has good hydrophobic property, and can be used for capturing carbon dioxide in a water vapor environment, so that the influence on water vapor in the process of capturing carbon dioxide in flue gas is reduced, and the problem that the adsorption property on carbon dioxide is reduced because water vapor in flue gas occupies the adsorption site of the carbon dioxide capture material when flue gas is captured in the prior art is effectively solved.
The invention provides a preparation method of a composite material for capturing carbon dioxide, which comprises the following steps:
and S1, dissolving the polybasic aldehyde and the nitrogen-containing heterocyclic compound in glacial acetic acid to prepare a mixed solution.
As an example, the polyaldehyde in step S1 is one or a combination of isophthalaldehyde, terephthalaldehyde, and trimeldehyde.
By way of example, the nitrogen-containing heterocyclic compound in step S1 is one or a combination of pyrrole, pyridine, imidazole and quinoline.
By way of example, the concentration of the polyaldehyde in the mixed solution in the step S1 is 0.05-1 mol/L.
Preferably, the concentration of the polyaldehyde in the mixed solution is 0.1-0.3 mol/L.
By way of example, the concentration of the nitrogen-containing heterocyclic compound in the mixed solution in the step S1 is 0.05-1 mol/L.
Preferably, the concentration of the nitrogen-containing heterocyclic compound in the mixed solution is 0.1-0.3 mol/L.
And S2, stirring the mixed solution at room temperature for a period of time under the protection gas, then adding ferric trichloride, continuously stirring to obtain an organic polymer precursor solution, placing the organic polymer precursor solution in a hydrothermal reaction kettle, and heating for reaction to obtain an organic polymer reaction solution.
For example, in the step S2, the mixed solution is stirred at room temperature for 0.1-1 h under a protective gas, and then ferric chloride is added and stirring is continued for 1-12 h.
Preferably, the mixed solution is stirred for 0.1-0.5 h at room temperature under protective gas, and then ferric trichloride is added and stirring is continued for 2-6 h.
As an example, the protective gas in step S2 is one or a combination of helium, argon, and nitrogen.
For example, the heating reaction temperature in step S2 is 120 to 240 ℃, and the heating reaction time is 24 to 120 hours.
Preferably, the heating temperature of the heating reaction is 150-210 ℃, and the heating reaction time is 48-96 h.
By way of example, the ratio of the number of moles of the ferric trichloride added in the step S2 to the volume of the glacial acetic acid in the step S1 is 0.01-0.2 mol/L.
And S3, cooling the organic polymer reaction solution, washing the organic polymer reaction solution for multiple times by using water and an organic solvent, and drying the organic polymer reaction solution in a vacuum drying oven to obtain the organic polymer.
As an example, the organic solvent in step S3 includes one or a combination of methanol, ethanol, acetone, tetrahydrofuran, and chloroform.
As an example, the washing in step S3 is at least one washing with water and at least one of the organic solvents sequentially.
For example, in step S3, the temperature of the vacuum drying oven is 60 to 120 ℃, and the drying time is 6 to 24 hours.
And S4, adding divinylbenzene and azobisisobutyronitrile into the ethyl acetate solution, and stirring at room temperature to obtain an ethyl acetate mixed solution.
Illustratively, divinylbenzene in step S4 is one or a combination of m-phenylenediethylene and p-phenylenediethylene.
For example, the room-temperature stirring time in step S4 is 0.5-6 h.
In the step S4, the concentration of divinylbenzene in the ethyl acetate mixed solution is 0.02-1 g/mL.
For example, in step S4, the concentration of azobisisobutyronitrile in the ethyl acetate mixed solution is 0.001-0.01 g/mL.
S5, grinding the organic polymer obtained in the step S3, placing the ground organic polymer in a hydrothermal reaction kettle, adding the ethyl acetate mixed solution obtained in the step S4, heating for reaction for a period of time, taking out, cooling and drying to obtain the composite material.
For example, the heating reaction temperature in step S5 is 75-150 ℃.
For example, the heating reaction time in step S5 is 12 to 48 hours.
As an example, the drying method in step S5 includes one of natural evaporation, vacuum drying, and drying at 40-80 ℃.
The invention also provides an application of the composite material for capturing carbon dioxide, which is prepared by the preparation method, in carbon dioxide capture.
In order to better understand the method of making and using the composite material for carbon dioxide capture of the present invention, the following specific examples are further illustrated.
Example 1
The embodiment provides a preparation method of a composite material for capturing carbon dioxide, which comprises the following steps:
s1, dissolving terephthalaldehyde and pyrrole in glacial acetic acid to prepare a mixed solution of 0.1mol/L terephthalaldehyde and 0.1mol/L pyrrole-containing ethyl acetate;
s2, stirring the ethyl acetate mixed solution for 0.5h under nitrogen, adding ferric trichloride, continuously stirring for 4h to obtain an organic polymer precursor solution, placing the organic polymer precursor solution in a hydrothermal reaction kettle, and heating and reacting at 180 ℃ for 72h to obtain an organic polymer reaction solution; wherein the ratio of ferric trichloride (mol) to glacial acetic acid (L) is 0.05 mol/L;
s3, naturally cooling the organic polymer reaction solution, sequentially washing with deionized water, methanol, acetone, tetrahydrofuran and chloroform, and drying in a vacuum drying oven at 80 ℃ to obtain a porous organic polymer;
s4, adding divinylbenzene and azobisisobutyronitrile into the ethyl acetate solution, and stirring at room temperature for 4 hours to obtain an ethyl acetate mixed solution with the divinylbenzene concentration of 0.1g/mL and the azobisisobutyronitrile concentration of 0.004 g/mL;
s5, grinding the porous organic polymer obtained in the step S3, placing the ground porous organic polymer in a hydrothermal reaction kettle with a tetrafluoroethylene lining, adding an ethyl acetate mixed solution to enable the solution to be just free of the porous organic polymer, heating the solution at 100 ℃ for reaction for 24 hours, taking the solution out, cooling the solution, and naturally evaporating the solution at room temperature to obtain the composite material.
Referring to fig. 1 to 3, fig. 1 shows the composite material prepared in this embodiment, which has a porous structure and is in a block shape, and the shape of the composite material is consistent with that of the inner liner of the hydrothermal reaction kettle; FIG. 2 is a schematic view of a process of dropping deionized water on the surface of a composite material, wherein the deionized water cannot penetrate into the composite material; FIG. 3 shows that the composite material is directly placed in a beaker filled with deionized water, and the composite material floats on the surface of the deionized water, which shows that the composite material has better hydrophobic property.
Example 2
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: preparing a mixed solution of 0.2mol/L terephthalaldehyde and 0.2mol/L pyrrole-containing ethyl acetate in step S1; the protective gas in the step S2 is argon; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Example 3
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: preparing a mixed solution of 0.3mol/L terephthalaldehyde and 0.3mol/L pyrrole-containing ethyl acetate in step S1; the protective gas in the step S2 is argon; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Example 4
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: preparing a mixed solution of 0.1mol/L m-phthalaldehyde and 0.1mol/L pyrrole-containing ethyl acetate in step S1; the protective gas in the step S2 is argon; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Example 5
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: preparing a mixed solution of 0.1mol/L m-phthalaldehyde and 0.1mol/L pyridine-containing ethyl acetate in step S1; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Example 6
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: preparing a mixed solution of 0.1mol/L mesitylene-trimethyl aldehyde and 0.1mol/L pyridine in step S1; the protective gas in the step S2 is helium; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Example 7
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: the protective gas in the step S2 is argon; step S4, adding divinylbenzene and azobisisobutyronitrile into the ethyl acetate solution, and stirring at room temperature for 4 hours to obtain an ethyl acetate mixed solution with the divinylbenzene concentration of 0.2g/mL and the azobisisobutyronitrile concentration of 0.004 g/mL; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Example 8
This example provides a method for preparing a composite material for carbon dioxide capture, which is different from example 1 in that: the protective gas in the step S2 is argon; step S4, adding divinylbenzene and azobisisobutyronitrile into the ethyl acetate solution, and stirring at room temperature for 2 hours to obtain an ethyl acetate mixed solution with the divinylbenzene concentration of 0.5g/mL and the azobisisobutyronitrile concentration of 0.008 g/mL; other methods and steps are the same as those in embodiment 1, and are not described herein again.
Comparative example 1
This comparative example provides a method for preparing a porous organic polymer, comprising the steps of:
s1, dissolving terephthalaldehyde and pyrrole in glacial acetic acid to prepare a mixed solution of 0.1mol/L terephthalaldehyde and 0.1mol/L pyrrole-containing ethyl acetate;
s2, stirring the ethyl acetate mixed solution for 0.5h under nitrogen, adding ferric trichloride, continuously stirring for 4h to obtain an organic polymer precursor solution, placing the organic polymer precursor solution in a hydrothermal reaction kettle, and heating and reacting at 180 ℃ for 72h to obtain an organic polymer reaction solution; wherein the ratio of ferric trichloride (mol) to glacial acetic acid (L) is 0.05 mol/L;
and S3, naturally cooling the organic polymer reaction solution, sequentially washing with deionized water, methanol, acetone, tetrahydrofuran and chloroform, and drying in a vacuum drying oven at 80 ℃ to obtain the porous organic polymer.
Referring to FIG. 4, which is an SEM image of the porous polymer prepared, it can be seen that the porous polymer prepared is spherical particles having a size of about 100 nm.
Example 9
The composite materials prepared in examples 1 to 8 and the porous organic polymer prepared in comparative example 1 were used as adsorbing materials to perform carbon dioxide adsorption performance tests, and the test method was as follows:
testing the adsorption performance of dry gas carbon dioxide: loading 10g of adsorbing material into the middle section of the fixed bed reactor, and filling the upper and lower vacant volumes with quartz; heating the adsorbing material to 120 ℃ under the argon atmosphere with the flow rate of 100ml/min, keeping the temperature for 2h, then cooling to 40 ℃, and introducing 15% volume fraction CO at the flow rate of 100ml/min2/N2Gas mixture (CO in gas mixture)215% by volume) into a fixed bed reactor, and calculating the adsorption materialThe adsorption capacity of the material to the dry gas carbon dioxide.
Testing moisture and carbon dioxide adsorption performance: loading 10g of adsorbing material into the middle section of the fixed bed reactor, and filling the upper and lower vacant volumes with quartz; heating the adsorbing material to 120 ℃ under the argon atmosphere with the flow rate of 100ml/min, keeping the temperature for 2h, then cooling to 40 ℃, and adding 15% volume fraction CO at the flow rate of 100ml/min2/N2Gas mixture (CO in gas mixture)215%) was introduced into a 40 c aqueous solution, and then a mixed gas with water vapor was introduced into a fixed bed reactor, and the amount of moisture and carbon dioxide adsorbed by the adsorbent was calculated.
The adsorption performance of the adsorption materials prepared in examples 1 to 8 and comparative example 1 on dry gas, moisture and carbon dioxide is as follows:
in conclusion, the invention provides a preparation method of a composite material for capturing carbon dioxide, which is simple, the prepared composite material is porous and has better hydrophobic property, and can be used for capturing carbon dioxide in a water vapor environment, so that the influence on water vapor in the process of capturing carbon dioxide in flue gas is reduced, and the problem that the adsorption property on carbon dioxide is reduced because the water vapor in the flue gas occupies the adsorption site of the carbon dioxide capturing material when the flue gas is captured in the prior art is effectively solved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method of preparing a composite material for carbon dioxide capture, the method comprising the steps of:
s1, dissolving the polybasic aldehyde and the nitrogen-containing heterocyclic compound in glacial acetic acid to prepare a mixed solution;
s2, stirring the mixed solution at room temperature for a period of time under protective gas, then adding ferric trichloride, continuously stirring to obtain an organic polymer precursor solution, placing the organic polymer precursor solution in a hydrothermal reaction kettle, and heating for reaction to obtain an organic polymer reaction solution;
s3, cooling the organic polymer reaction solution, washing the organic polymer reaction solution for multiple times by using water and an organic solvent, and placing the organic polymer reaction solution in a vacuum drying oven for drying to obtain an organic polymer;
s4, adding divinylbenzene and azobisisobutyronitrile into the ethyl acetate solution, and stirring at room temperature to obtain an ethyl acetate mixed solution;
s5, grinding the organic polymer obtained in the step S3, placing the ground organic polymer in a hydrothermal reaction kettle, adding the ethyl acetate mixed solution obtained in the step S4, heating for reaction for a period of time, taking out, cooling and drying to obtain the composite material.
2. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: step S1 includes any one or a combination of the following:
the polyaldehyde is one or a combination of m-phthalaldehyde, p-phthalaldehyde and trimesic aldehyde;
the nitrogen-containing heterocyclic compound is one or a combination of pyrrole, pyridine, imidazole and quinoline.
3. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that:
in the step S1, the concentration of the polyaldehyde in the mixed solution is 0.05-1 mol/L;
in the step S1, the concentration of the nitrogen-containing heterocyclic compound in the mixed solution is 0.05-1 mol/L.
4. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: step S2 includes any one or a combination of the following:
stirring the mixed solution for 0.1-1 h at room temperature under protective gas, and then adding ferric trichloride and continuously stirring for 1-12 h;
the protective gas is one or a combination of helium, argon and nitrogen;
the heating reaction temperature is 120-240 ℃, and the heating reaction time is 24-120 h.
5. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: the ratio of the mole number of the ferric trichloride added in the step S2 to the volume of the glacial acetic acid in the step S1 is 0.01-0.2 mol/L.
6. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: step S3 includes any one or a combination of the following:
the organic solvent comprises one or a combination of methanol, ethanol, acetone, tetrahydrofuran and chloroform;
the washing is at least one time of washing with water and at least one of the organic solvents in sequence;
the temperature of the vacuum drying oven is 60-120 ℃, and the drying time is 6-24 hours.
7. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: step S4 includes any one or a combination of the following:
the divinylbenzene is one or a combination of m-phenylenediethylene and p-phenylenediethylene;
the stirring time at room temperature is 0.5-6 h.
8. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: in the step S4, the concentration of the divinylbenzene in the ethyl acetate mixed solution is 0.02-1 g/mL;
in the step S4, the concentration of the azobisisobutyronitrile in the ethyl acetate mixed solution is 0.001-0.01 g/mL.
9. The method for preparing a composite material for carbon dioxide capture according to claim 1, characterized in that: step S5 includes any one or a combination of the following:
the temperature of the heating reaction is 75-150 ℃;
the heating reaction time is 12-48 h;
the drying method comprises one of natural evaporation, vacuum drying and drying at 40-80 ℃.
10. Use of a composite material prepared by the method of any one of claims 1 to 9 in carbon dioxide capture.
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