High-efficiency composite carbon capture solid adsorbent and its preparation method and application

Abstract

The present invention discloses a kind of high-efficiency composite carbon capture solid adsorbent and its preparation method and application, belong to the technical field of carbon capture materials.Its technical scheme is: it is made by dipping honeycomb in active liquid, and preparation method comprises the following steps: 1) chromium sulfate, manganese acetate and cobalt sulfate are added with water, and then quartz sand and silica gel are added and stirred; 2) calcium sulfate is ground, and then beta-alumina and cocamidopropyl are added; 3) dioctyl phthalate, carboxymethyl cellulose, poly-α-olefin, plasticizer, dispersant one and adhesive are kneaded to form mud material; honeycomb is extruded, dried, and calcined at high temperature to obtain modified silica honeycomb; 4) linear polyacrylimide, modifier, dispersant two and dispersing solvent are stirred and mixed uniformly to form active impregnation solution; 5) impregnation solution, ultrasonic, obtain high-efficiency composite carbon capture solid adsorbent. The present invention makes the distribution of amine-based active ingredients more uniform, improves carbon dioxide adsorption and capture capacity.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon capture materials, and in particular relates to a high-efficiency composite carbon capture solid adsorbent. Background Art

[0002] To combat global warming caused by the widespread burning of fossil fuels, traditional carbon capture technologies, such as pre-combustion and post-combustion capture at fixed point sources, can help slow the growth of atmospheric CO2 concentrations. Direct air CO2 capture, on the other hand, can truly reduce CO2 concentrations in the air and is a key "negative carbon emission" technology. Therefore, research into negative emission technologies, represented by direct air CO2 capture, is a top priority. In the past few years, the primary methods of direct air capture research have been chemical solution absorption and solid adsorption. Currently, chemical solution absorption is relatively mature and the only technology to have achieved large-scale application. However, it also suffers from common challenges, such as high absorption and regeneration energy consumption, resulting in high operating costs. In contrast, solid adsorption offers significant advantages, including low regeneration energy consumption, simple operation, a wide operating temperature range, and no equipment corrosion. It is currently the focus of research and holds great promise. Adsorption methods for direct air CO2 capture primarily include physical adsorption and amine-based adsorption. However, physical adsorption has a low capacity, and some materials, such as molecular sieves, exhibit a high affinity for water, which can reduce the adsorption of CO2 through competitive adsorption. The significant advantage of amine-based adsorption is its large adsorption capacity, good chemical stability, and high reversibility, and it is currently the focus of research by scholars at home and abroad.

[0003] There are three main methods for synthesizing amine-loaded adsorbents for CO2 capture. Solid amine adsorbents can be divided into three categories: Type I based on physical impregnation, Type II based on chemical grafting, and Type III based on in-situ polymerization. Regarding DAC technology, experts and scholars have focused more on Type I adsorbents using the physical impregnation method, which involves impregnating the modified support with a monoamine solution. This is because, compared to the other two synthesis methods, impregnation-synthesized amine-loaded adsorbents are simple to prepare and offer superior adsorption performance. A typical monoamine solution is polyethyleneimine (PEI). However, simply impregnating the modified support with a monoamine can easily cause CO2 to remain within the pores after reacting with the outer amine groups, resulting in blockage. This further prevents CO2 from reacting with the inner amine groups, limiting the adsorption capacity and amine efficiency of the support. Furthermore, polyethyleneimine degrades in the presence of oxygen, making it unstable, significantly reducing the adsorption capacity, amine efficiency, and cycle life of the solid adsorbent. Therefore, developing an amine-based polymer with improved oxidative stability and a high-efficiency composite amine-based adsorbent with high adsorption capacity and amine efficiency is of great significance. Summary of the Invention

[0004] The present invention provides a high-efficiency composite carbon capture solid adsorbent, which makes the distribution of amine-based active ingredients more uniform and improves the carbon dioxide adsorption and capture capacity.

[0005] The technical solution of the present invention is:

[0006] In a first aspect, a high-efficiency composite carbon capture solid adsorbent is prepared by impregnating a honeycomb body in an active liquid, wherein the honeycomb body is made of the following raw materials in parts by weight:

[0007] 40-50 parts of β-alumina, 36-48 parts of silica gel, 15-20 parts of dioctyl phthalate, 15-18 parts of carboxymethyl cellulose, 5-10 parts of polyalphaolefin, 3-4 parts of chromium sulfate, 2-3 parts of manganese acetate, 3-4 parts of cobalt sulfate, 5-6 parts of quartz sand, 1-2 parts of calcium sulfate, 5-10 parts of cocamidopropyl, 60-100 parts of water, 10-20 parts of plasticizer, 5-10 parts of dispersant, 5-10 parts of adhesive;

[0008] The active impregnation solution is made from the following raw materials in parts by weight:

[0009] 30-40 parts of linear polyacrylimide

[0010] 10-20 parts of polyethylene amine imine derivatives

[0011] Dispersant 2 5-10 parts

[0012] 40-50 parts of dispersion solvent

[0013] Preferably, the polyethyleneamine imine derivative is one of triethylenetetramine, tetraethylenepentamine and diethylenetriamine.

[0014] Preferably, the second dispersant is one or both of polyacrylic acid and polystyrene acid; and the dispersing solvent is one of methanol, ethanol, acetonitrile or acetone.

[0015] Preferably, the plasticizer is dioctyl 1,2-cyclohexanediol, the first dispersant is polyethylene glycol, and the adhesive is epoxidized polybutadiene resin.

[0016] In a second aspect, a method for preparing the high-efficiency composite carbon capture solid adsorbent is disclosed, comprising the following steps:

[0017] 1) Add 3-4 parts of chromium sulfate, 2-3 parts of manganese acetate, and 3-4 parts of cobalt sulfate to 20-30 parts of water and stir in a blender until completely dissolved. Then add 5-6 parts of quartz sand and 36-48 parts of silica gel and stir for 1-2 hours. Place in a sealed stainless steel reactor, hydrothermally treat at 90-120°C, let it settle for 10-12 hours, then dry and grind for later use.

[0018] 2) Grind 1-2 parts of calcium sulfate, sieve out 50-100 mesh, add 40-50 parts of β-alumina and 5-10 parts of cocamidopropyl, stir thoroughly until dissolved, let stand, oven dry, and grind for later use;

[0019] 3) adding 15-20 parts of dioctyl phthalate, 15-18 parts of carboxymethyl cellulose, 5-10 parts of poly-α-olefin, 10-20 parts of plasticizer, 5-10 parts of dispersant, 5-10 parts of adhesive, and 40-70 parts of water to the material obtained in step 2) and kneading the mixture to form a slurry; extruding the slurry into a honeycomb body using an extruder, drying the honeycomb body, and calcining the honeycomb body to obtain a composite modified silica honeycomb body having a porous structure;

[0020] 4) Stir and mix 30-40 parts of linear polyacrylimide, 10-20 parts of polyethylene amine imine derivative, 5-10 parts of dispersant II and 40-50 parts of dispersing solvent to form an active impregnation solution;

[0021] 5) placing the composite modified silica honeycomb with a porous structure obtained in step 3) in the active impregnation solution of step 4) and ultrasonicating it to obtain a high-efficiency composite carbon capture solid adsorbent.

[0022] Preferably, in step 2), the mixture is allowed to stand for 3-4 hours and then dried in an oven at 180-200° C. for 5-8 hours.

[0023] Preferably, in step 3), the drying temperature is 80-120° C. for 120-150 h, and the calcination temperature is 500-600° C. for 30-50 h.

[0024] Preferably, the ultrasonication time in step 5) is 50-90 min.

[0025] In a third aspect, the application of the high-efficiency composite carbon capture solid adsorbent in carbon capture is disclosed.

[0026] The addition of chromium sulfate, manganese acetate and cobalt sulfate can be evenly loaded onto silica to form stable covalent structures of Cr-O-Si, Mn-O-Si and Co-O-Si. The loading process does not destroy the structure of SiO2 and the specific surface area of the extruded honeycomb is larger than before. After acidification treatment of the surface, the acid sites increase and the acidity is strong. At the same time, calcium sulfate particles are added to bond to the surface of alumina to improve the adsorption.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The high-efficiency composite carbon capture solid adsorbent prepared by the present invention improves the adsorption and capture capacity of carbon dioxide. The addition of dispersant II makes the distribution of the amino active ingredients more uniform, providing more reaction sites for the adsorption of CO2, thereby increasing the adsorption amount of CO2. At the same time, it will not have a negative impact on the cyclic adsorption performance of the adsorbent, and can still maintain good adsorption and desorption performance after three cycles.

[0029] 2. The use of linear polyacrylimide in the active impregnation liquid can improve the oxidative stability, and the modification with polyvinylamine imine derivatives and the addition of dispersant 2 can enable the active impregnation liquid to maintain good dispersibility and stability.

[0030] 3. Using the ultrasonic impregnation method, the solid adsorbent and active impregnation liquid are placed in the ultrasonic field. The mechanical action of the ultrasonic wave allows the active impregnation liquid to penetrate into the micropores of the honeycomb body. The penetration is more complete, the efficiency is high, the waste is small, no other pollutants are generated, and the process is more environmentally friendly.

[0031] 4. The addition of β-alumina can make the prepared honeycomb have a larger specific surface area, and the addition of calcium sulfate particles bonded to the alumina surface improves adsorption. Silica gel is a colloid composed of silicon dioxide and water molecules. It has high cross-linking density, high strength, high porosity, chemical inertness, and good insulation properties. It is an important material for preparing silica honeycombs. Dioctyl phthalate is a plasticizer with high plasticizing efficiency and good softness. Together with cocamidopropyl (amphoteric surfactant with good compatibility) and carboxymethyl cellulose (adhesive, thickener), it can achieve smooth extrusion of the honeycomb. The addition of quartz sand makes the carrier more wear-resistant and corrosion-resistant. The addition of dispersants such as polyethylene glycol can make the active material elements more evenly dispersed in the solution, thereby increasing the loading capacity. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0033] The poly-α-olefins used in the examples and comparative examples of the present invention were purchased from poly-α-olefin 162, which was purchased from Panhua (Chemical) Shanghai Co., Ltd. and was poly-α-olefin 162.

[0034] Example 1

[0035] The method for preparing the high-efficiency composite carbon capture solid adsorbent comprises the following steps:

[0036] 1) Add 3 parts of chromium sulfate, 3 parts of manganese acetate, and 3 parts of cobalt sulfate to 23 parts of water and stir in a blender until completely dissolved. Then add 5 parts of quartz sand and 45 parts of silica gel and stir for 2 hours. Place in a sealed stainless steel reactor, hydrothermally treat at 105°C, let it settle for 12 hours, then dry and grind for later use.

[0037] 2) Grind 2 parts of calcium sulfate, sieve out 80 mesh, add 45 parts of β-alumina and 6 parts of cocamidopropyl, stir thoroughly until dissolved, let stand for 4 hours, dry in an oven at 195°C for 8 hours, and grind for later use;

[0038] 3) adding 16 parts of dioctyl phthalate, 15 parts of carboxymethyl cellulose, 6 parts of poly-α-olefin, 12 parts of dioctyl 1,2-cyclohexanediol, 6 parts of polyethylene glycol, 5 parts of epoxidized polybutadiene resin, and 50 parts of water to the material obtained in step 2) and kneading the mixture to form a slurry; extruding the slurry into a honeycomb using an extruder, drying the honeycomb at 110° C. for 130 hours, and calcining the honeycomb at 559° C. for 48 hours to obtain a composite modified silica honeycomb having a porous structure, wherein the honeycomb has a square cross-section and a pore size of 1.8 mm;

[0039] 4) 30 parts of linear polyacrylimide, 12 parts of triethylenetetramine, 6 parts of polyacrylic acid and 40 parts of methanol were stirred and mixed to form an active impregnation solution;

[0040] 5) The composite modified silica honeycomb with a porous structure obtained in step 3) is placed in the active impregnation solution of step 4) and ultrasonicated for 80 minutes to obtain a high-efficiency composite carbon capture solid adsorbent.

[0041] Example 2

[0042] The method for preparing the high-efficiency composite carbon capture solid adsorbent comprises the following steps:

[0043] 1) Add 30 parts of water to 4 parts of chromium sulfate, 2 parts of manganese acetate, and 4 parts of cobalt sulfate and stir in a blender until completely dissolved. Then add 6 parts of quartz sand and 36 parts of silica gel and stir for 2 hours. Place in a sealed stainless steel reactor, hydrothermally treat at 110°C, let it settle for 12 hours, then dry and grind for later use.

[0044] 2) Grind 2 parts of calcium sulfate, sieve out 80 mesh, add 42 parts of β-alumina and 6 parts of cocamidopropyl, stir thoroughly until dissolved, let stand for 4 hours, dry in an oven at 200°C for 8 hours, grind and set aside;

[0045] 3) adding 16 parts of dioctyl phthalate, 15 parts of carboxymethyl cellulose, 6 parts of poly-α-olefin, 12 parts of dioctyl 1,2-cyclohexanediol, 6 parts of polyethylene glycol, 5 parts of epoxidized polybutadiene resin, and 60 parts of water to the material obtained in step 2) and kneading the mixture to form a slurry; extruding the slurry into a honeycomb using an extruder, drying the honeycomb at 110° C. for 130 hours, and calcining the honeycomb at 600° C. for 48 hours to obtain a composite modified silica honeycomb having a porous structure, wherein the honeycomb has a square cross-section and a pore size of 1.8 mm;

[0046] 4) 38 parts of linear polyacrylimide, 12 parts of tetraethylenepentamine, 6 parts of polyacrylic acid and 40 parts of ethanol were stirred and mixed to form an active impregnation solution;

[0047] 5) The composite modified silica honeycomb with a porous structure obtained in step 3) is placed in the active impregnation solution of step 4) and ultrasonicated for 90 minutes to obtain a high-efficiency composite carbon capture solid adsorbent.

[0048] Example 3

[0049] The method for preparing the high-efficiency composite carbon capture solid adsorbent comprises the following steps:

[0050] 1) Add 3 parts of chromium sulfate, 3 parts of manganese acetate, and 3 parts of cobalt sulfate to 23 parts of water and stir in a blender until completely dissolved. Then add 5 parts of quartz sand and 45 parts of silica gel and stir for 2 hours. Place in a sealed stainless steel reactor, hydrothermally treat at 105°C, let it settle for 12 hours, then dry and grind for later use.

[0051] 2) Grind 2 parts of calcium sulfate, sieve out 80 mesh, add 45 parts of β-alumina and 6 parts of cocamidopropyl, stir thoroughly until dissolved, let stand for 4 hours, dry in an oven at 195°C for 8 hours, and grind for later use;

[0052] 3) adding 16 parts of dioctyl phthalate, 15 parts of carboxymethyl cellulose, 6 parts of poly-α-olefin, 12 parts of dioctyl 1,2-cyclohexanediol, 6 parts of polyethylene glycol, 5 parts of epoxidized polybutadiene resin, and 70 parts of water to the material obtained in step 2) and kneading the mixture to form a slurry; extruding the slurry into a honeycomb body using an extruder, drying the honeycomb body at 110° C. for 130 hours, and calcining the honeycomb body at a high temperature of 559° C. for 48 hours to obtain a composite modified silica honeycomb body having a porous structure, wherein the honeycomb body has a square cross-section and a pore size of 1.8 mm;

[0053] 4) Mix 35 parts of linear polyacrylimide, 12 parts of diethylenetriamine, 6 parts of polystyrene acid, and 40 parts of acetone to form an active impregnation solution;

[0054] 5) The composite modified silica honeycomb with a porous structure obtained in step 3) is placed in the active impregnation solution of step 4) and ultrasonicated for 60 minutes to obtain a high-efficiency composite carbon capture solid adsorbent.

[0055] Comparative Example 1

[0056] Different from Example 1, step 4) of this comparative example does not contain dispersant 2, and the remaining steps are the same as Example 1.

[0057] Comparative Example 2

[0058] The difference from Example 1 is that in step 4) of this comparative example, linear polyacrylimide is replaced by an equal amount of polyethyleneimine PEI, and the remaining steps are the same as in Example 1.

[0059] Comparative Example 3

[0060] Different from Example 1, in step 5) of this comparative example, ultrasound is not used but ordinary stirring is used, and the remaining steps are the same as those in Example 1.

[0061] Comparative Example 4

[0062] The difference from Example 1 is that in step 1) of this comparative example, chromium sulfate, manganese acetate and cobalt sulfate are not added, and the remaining steps are the same as those of Example 1.

[0063] Comparative Example 5

[0064] The difference from Example 1 is that in step 2) of this comparative example, calcium sulfate is not added, and the remaining steps are the same as in Example 1.

[0065] Comparative Example 6

[0066] The difference from Example 1 is that in step 4) of this comparative example, no modifier, polyethylene amine imine derivative, is added. The remaining steps are the same as those in Example 1.

[0067] The solid adsorbents prepared in Examples 1-3 and Comparative Examples 1-6 were tested for adsorption capacity and amine efficiency. Specifically, 15 mg of each of the solid adsorbents prepared in Examples 1-3 and Comparative Examples 1-6 were tested for CO adsorption performance using a TGA / DSC simultaneous thermal analyzer. High-purity N₂ was introduced into the instrument, and the sample was heated from room temperature to 110°C at a rate of 10°C / min and held for 3 hours. The sample was then cooled to 25°C at a rate of 10°C / min, and high-purity N₂ was continued to flow at this temperature for 2 hours. The gas flow was then switched to a mixed gas containing 400 ppm CO₂ and the remainder N₂, which was maintained for 12 hours until the solid adsorbent was saturated with adsorption. The gas flow was then switched to high-purity N₂, and the sample was heated from 25°C to 110°C at a rate of 10°C / min for desorption. The specific results are shown in Table 1.

[0068] Table 1

[0069]

[0070] The CO2 adsorption capacity of Example 1 increased by 19.4% compared with Comparative Example 2, and the amine group utilization efficiency also increased by 18.6%. In Comparative Example 2, the linear polyacrylimide was replaced with PEI. PEI is easily oxidized and decomposed, has poor adsorption stability, and has a low CO2 adsorption capacity. The adsorption capacity of Comparative Example 1 was slightly lower than that of Example 1, which indicates that without the addition of dispersant 2, there may be accumulation and blockage in the pores of the silicon-based carrier, and the active substance of the impregnation liquid is unevenly dispersed. According to Comparative Example 3, ultrasonic impregnation can spray the active substance more evenly, resulting in better adsorption capacity. Compared with Example 1, Comparative Examples 4 and 5 can be seen that by modifying the carrier surface, increasing acidic sites and calcium sulfate adhesion, the adsorption capacity and utilization efficiency can be significantly improved. In Comparative Example 6, the modifier polyethylene amine imine derivative synergizes with the linear polyacrylimide to enhance its stability. The polyethylene amine imine derivative is the main amine adsorption solution substance. Not adding this substance may result in a significant decrease in adsorption capacity.

[0071] The solid adsorbents prepared in Examples 1-3 and Comparative Examples 1-6 were subjected to CO2-amine adsorption / desorption cycle performance testing. Specifically, 15 mg of the composite modified silica honeycomb was subjected to CO2 cyclic adsorption performance testing using a TGA / DSC simultaneous thermal analyzer. The multiple-cycle adsorption and desorption process was consistent with the single heating and cooling steps described above. Each cycle lasted 8.5 hours for adsorption and 35 minutes for desorption, with three cycles. The results are shown in Table 2.

[0072] Table 2

[0073]

[0074] The CO2 adsorption capacity of the embodiments and the comparative examples decreased to a certain extent with the increase of the number of cycles. The adsorption capacity of the third cycle in Examples 1-3 was 82.7%, 81.6% and 83.2% of the initial value, respectively. The adsorption capacity of the third cycle in Comparative Example 1 was 77.6% of the initial value, mainly because the dispersing effect of the dispersant was lacking, which was not conducive to promoting the dispersion of the modifier and affecting the cyclic adsorption performance of the adsorbent; the adsorption capacity of the third cycle in Comparative Example 2 was 66.9% of the initial value, which shows that the presence of linear polypropyleneimine can improve the stability of the cyclic adsorption performance and extend the service life. Such an effect cannot be achieved by replacing PEI in Comparative Example 2; the adsorption capacity of the third cycle in Comparative Example 3 was 74.80% of the initial value, which is significantly lower than that of the present invention. Inventive embodiment, this is because ultrasonic energy can make the active impregnation liquid penetrate into the micropores of the honeycomb body, which can improve the cyclic adsorption performance of the adsorbent on the basis of improving the amine efficiency; the adsorption amount of the third cycle adsorption of Comparative Example 4 is 73.63% of the initial value, the carrier is not acidified and its acidic sites are reduced, the adsorption amount is reduced, and the stability is also reduced; the adsorption amount of the third cycle adsorption of Comparative Example 5 is 79.93% of the initial value, and the adsorption stability performance is not much different from that of Example 1. Calcium sulfate mainly increases the adsorption amount of a part of the carrier and has little effect on the adsorption stability performance; the adsorption amount of the third cycle adsorption of Comparative Example 6 is 79.39% of the initial value. No polyethylene amine imine derivative is added. Although the adsorption amount is reduced, its adsorption performance stability is still very good due to the presence of polypropylene imine.

[0075] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions are intended to fall within the scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. High-efficiency composite carbon capture solid adsorbent, characterized in that: The honeycomb body is made by dipping it in an active liquid, wherein the honeycomb body is made of the following raw materials in parts by weight: 40-50 parts of β-alumina, 36-48 parts of silica gel, 15-20 parts of dioctyl phthalate, 15-18 parts of carboxymethyl cellulose, 5-10 parts of polyalphaolefin, 3-4 parts of chromium sulfate, 2-3 parts of manganese acetate, 3-4 parts of cobalt sulfate, 5-6 parts of quartz sand, 1-2 parts of calcium sulfate, 5-10 parts of cocamidopropyl, 60-100 parts of water, 10-20 parts of plasticizer, 5-10 parts of dispersant, 5-10 parts of adhesive; The active impregnation solution is made from the following raw materials in parts by weight: 30-40 parts of linear polyacrylimide 10-20 parts of organic amine Dispersant 2 5-10 parts 40-50 parts of dispersion solvent; The organic amine is one of triethylenetetramine, tetraethylenepentamine and diethylenetriamine; The second dispersant is polyacrylic acid; the dispersing solvent is one of methanol, ethanol, acetonitrile or acetone; The method for preparing the high-efficiency composite carbon capture solid adsorbent comprises the following steps: 1) Add 20-30 parts of water to 3-4 parts of chromium sulfate, 2-3 parts of manganese acetate, and 3-4 parts of cobalt sulfate, and stir with a blender until completely dissolved. Then, add 5-6 parts of quartz sand and 36-48 parts of silica gel, stir for 1-2 hours, place in a sealed stainless steel reactor, hydrothermally treat at 90-120° C., let stand for 10-12 hours, then dry and grind for later use; 2) grinding 1-2 parts of calcium sulfate, sieving out 50-100 mesh using a sieve, then adding 40-50 parts of β-alumina and 5-10 parts of cocamidopropyl, stirring thoroughly until dissolved, standing, oven drying, and grinding for later use; 3) adding 15-20 parts of dioctyl phthalate, 15-18 parts of carboxymethyl cellulose, 5-10 parts of poly-α-olefin, 10-20 parts of plasticizer, 5-10 parts of dispersant, 5-10 parts of adhesive, and 40-70 parts of water to the material obtained in step 2) and kneading to form a slurry; extruding the slurry into a honeycomb body using an extruder, drying the honeycomb body, and calcining the honeycomb body to obtain a composite modified silica honeycomb body having a porous structure; 4) 30-40 parts of linear polyacrylimide, 10-20 parts of organic amine, 5-10 parts of dispersant II and 40-50 parts of dispersing solvent are stirred and mixed to form an active impregnation solution; 5) placing the composite modified silica honeycomb with a porous structure obtained in step 3) in the active impregnation solution of step 4) and ultrasonicating it to obtain a high-efficiency composite carbon capture solid adsorbent.

2. The high-efficiency composite carbon capture solid adsorbent according to claim 1, characterized in that: The plasticizer is dioctyl 1,2-cyclohexanediol, the dispersant is polyethylene glycol, and the adhesive is epoxidized polybutadiene resin.

3. The high-efficiency composite carbon capture solid adsorbent according to claim 1, characterized in that: In step 2), the mixture is allowed to stand for 3-4 hours and then dried in an oven at 180-200° C. for 5-8 hours.

4. The high-efficiency composite carbon capture solid adsorbent according to claim 1, characterized in that: In step 3), the drying temperature is 80-120° C. for 120-150 h, and the calcination temperature is 500-600° C. for 30-50 h.

5. The high-efficiency composite carbon capture solid adsorbent according to claim 1, characterized in that: The ultrasonication time in step 5) is 50-90 min.

6. Use of the high-efficiency composite carbon capture solid adsorbent according to claim 1 in carbon dioxide capture.

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