Preparation method and application of multi-level hole biomass activated carbon

Abstract

The application discloses a preparation method and application of a multi-level pore biomass activated carbon, and belongs to the technical field of activated carbon preparation. The method uses a mixture of nitrogen-rich agricultural and forestry wastes and industrial by-products as raw materials, optimizes a pretreatment process, innovates a composite activation system, and controls carbonization-activation parameters, so that a biomass-based activated carbon rich in nitrogen elements and having multi-level pores is prepared. The nitrogen elements in the raw materials can be used for nitrogen doping of the activated carbon in the carbonization-activation process. The application effectively solves the problems of low utilization rate of raw materials, single pores and the like in the existing activated carbon preparation process, solves the problem of difficult treatment of industrial by-products, simultaneously simplifies the preparation process of the nitrogen-rich activated carbon, has economic value and environmental protection benefits, and can be widely applied to the fields of water treatment, carbon capture and deep treatment of industrial wastewater and the like.

Description

Technical Field

[0001] This invention belongs to the field of agricultural and forestry waste utilization and activated carbon preparation, and specifically relates to a method for preparing multi-level porous biomass activated carbon and its application. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Activated carbon, as a porous material with excellent adsorption properties, is widely used in gas purification, carbon capture, food processing, and pharmaceutical purification. Currently, agricultural and forestry waste (such as walnut shells, peony seed meal, and peanut shells) is an ideal raw material for activated carbon preparation due to its wide availability, low price, and high carbon and nitrogen content. It provides a carbon source while allowing for in-situ nitrogen doping. However, using pure nitrogen-rich agricultural and forestry waste as the carbon source for activated carbon preparation is subject to seasonal limitations and has a low carbon yield. The large-scale accumulation of industrial by-products (such as steel slag and fly ash) not only occupies land resources but also causes environmental pollution. While using pure industrial by-products to prepare adsorbents offers a stable source, it results in low carbon content and high impurity levels, requiring the addition of combustion aids or purifying agents, increasing the cost of adsorbent preparation. Furthermore, current activated carbon preparation often uses single activating agents such as potassium hydroxide, phosphoric acid, and sodium amide. This not only results in low activation efficiency but also produces activated carbon with a uniform pore size, affecting the diffusion of adsorbents within the activated carbon and thus impacting adsorption efficiency.

[0004] Therefore, developing a method for preparing multi-level porous biomass activated carbon with high raw material utilization, good activation effect, low production cost, and environmental friendliness is of great practical significance. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a method for preparing multi-level porous biomass activated carbon. This invention proposes a method for preparing biomass activated carbon by compounding agricultural and forestry waste with industrial by-products in a specific ratio. The high carbon content of the agricultural and forestry waste compensates for the carbon deficiency of the industrial by-products, while the rigid structure of the industrial by-products improves the formability of the raw material. This simultaneous resource utilization of both wastes overcomes traditional limitations, solving both the seasonal supply constraints and low carbon recovery rates associated with using only pure agricultural and forestry waste as raw materials, and the increased production costs associated with using only pure industrial by-products to prepare activated carbon adsorbents. This invention designs a three-component composite activator of KOH-ammonium dihydrogen phosphate-silica, which can achieve a synergistic functional effect. During the activation process, KOH etches the surface of biochar to form micropores, providing microchannels for small molecule adsorption. Ammonium dihydrogen phosphate decomposes during carbonization to produce NH3 and H3PO4. NH3 expands the pores, and H3PO4 promotes the development of mesopores, providing channels for molecule diffusion within the activated carbon. SiO2 can inhibit excessive micropore collapse at high temperatures and adjust the micropore-to-mesopore ratio, resulting in activated carbon containing pores of different sizes, including micropores and mesopores. This achieves multi-level pore synergistic adsorption, solves the problem of single pore size in activated carbon, and improves the adsorption efficiency of activated carbon.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for preparing hierarchical porous biomass activated carbon, comprising:

[0008] Nitrogen-rich agricultural and forestry waste is mixed evenly with industrial by-products, crushed, soaked in an alkaline solution, washed, and dried to obtain pretreated raw materials.

[0009] A composite activator is obtained by uniformly mixing an alkaline activator, an acidic activator, and silica in a solvent.

[0010] The pretreated raw material is impregnated in a composite activator, mixed evenly, and reacted at a preset temperature to obtain the impregnated material.

[0011] The impregnated material is carbonized and activated to obtain crude activated carbon.

[0012] The crude activated carbon was acid-washed, washed, and dried under ultrasonic conditions to obtain multi-level porous biomass activated carbon.

[0013] In a second aspect, the present invention provides multi-level porous biomass activated carbon prepared by the above-described method.

[0014] A third aspect of the present invention provides the application of the above-mentioned hierarchical porous biomass activated carbon in the adsorption and capture of carbon dioxide, wherein the adsorption temperature is 0-50°C.

[0015] Beneficial effects of the present invention

[0016] 1. The raw materials are environmentally friendly and economical. Agricultural and forestry waste and industrial by-products are used as raw materials. The high carbon content of agricultural and forestry waste makes up for the carbon deficiency of industrial by-products, and the rigid structure of industrial by-products improves the formability of raw materials, achieving "complementary advantages" and "resource utilization of both wastes" at the same time. This reduces production costs while realizing the resource utilization of waste and reducing environmental pollution.

[0017] 2. A three-component composite activator, KOH, ammonium dihydrogen phosphate, and silica, can achieve a synergistic functional effect. During activation, KOH etches the surface of biochar to form micropores, providing microchannels for small molecule adsorption. Ammonium dihydrogen phosphate decomposes during carbonization to produce NH3 and H3PO4. NH3 expands the pores, and H3PO4 promotes the development of mesopores, providing channels for molecule diffusion within the activated carbon. SiO2 can inhibit excessive micropore collapse at high temperatures and adjust the micropore-to-mesopore ratio, resulting in activated carbon with pores of varying sizes between micropores and mesopores. The three-component composite activator synergistically solves the pore size distribution problem, achieving multi-level pore synergistic adsorption and improving the adsorption efficiency of activated carbon.

[0018] 3. Traditional post-treatment methods often employ room temperature acid washing, which suffers from incomplete removal of residual activators. This invention improves the removal efficiency of residual potassium and phosphorus in activated carbon by combining temperature-controlled acid washing with ultrasonic vibration, promotes the dissolution of metallic impurities such as Ca and Fe in industrial byproducts, and reduces ash and other impurities in the activated carbon. Simultaneously, ultrasonic vibration in the ultrasonic oscillator can peel off irregular graphite layers within the biochar, creating new pores or opening blocked pores, thereby increasing the porosity of the biochar and improving its adsorption efficiency to a certain extent. Furthermore, the effective removal of residues (such as potassium, phosphorus, and ash) from the activated carbon expands its applications in the food and pharmaceutical fields.

[0019] 4. Using nitrogen-rich agricultural and forestry waste as raw material for activated carbon preparation, the nitrogen elements inherent in the agricultural and forestry waste and the NH3 produced by the decomposition of ammonium dihydrogen phosphate during the carbonization and activation process can be used as nitrogen sources to dope the activated carbon in situ. After carbonization and activation, nitrogen-doped biomass activated carbon can be obtained. This process simplifies the preparation steps of nitrogen-doped activated carbon, shortens the preparation process of nitrogen-doped activated carbon, and reduces the preparation cost of nitrogen-doped activated carbon. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. Exemplary embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a pore size distribution diagram of the activated carbon prepared in Example 1 of the present invention;

[0022] Figure 2This is a pore size distribution diagram of the activated carbon prepared in Example 2 of the present invention. Detailed Implementation

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] This invention provides a method for preparing multi-level porous biomass activated carbon, comprising:

[0025] Nitrogen-rich agricultural and forestry waste is mixed evenly with industrial by-products, crushed, soaked in an alkaline solution, washed, and dried to obtain pretreated raw materials.

[0026] A composite activator is obtained by uniformly mixing an alkaline activator, an acidic activator, and silica in a solvent.

[0027] The pretreated raw material is impregnated in a composite activator, mixed evenly, and reacted at a preset temperature to obtain the impregnated material.

[0028] The impregnated material is carbonized and activated to obtain crude activated carbon.

[0029] The crude activated carbon was acid-washed, washed, and dried under ultrasonic conditions to obtain multi-level porous biomass activated carbon.

[0030] This invention does not impose any specific limitations on the types of nitrogen-rich agricultural and forestry waste. Preferably, the nitrogen-rich agricultural and forestry waste is selected from at least one of peony seed meal, soybean meal, walnut shells, soybean straw, and peanut shells to better improve the performance of activated carbon.

[0031] The present invention does not impose any specific limitations on the types of industrial by-products. Preferably, the industrial by-products are selected from at least one of steel slag, fly ash, and tailings powder to better improve the performance of activated carbon.

[0032] This invention does not impose any particular limitation on the type of alkaline solution; preferably, the alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution. By controlling the soaking and drying with the alkaline solution, impurities such as ash in the raw materials are removed, thereby improving the purity and carbon content of the raw materials.

[0033] The dosage of each component in the composite activator affects the activator's effectiveness. Therefore, this invention studies the dosage of each component in the composite activator. Preferably, the mass ratio of the alkaline activator, acidic activator, and silica is 4-6:2-3:1. Potassium hydroxide (a strong alkaline activator that can construct micropores), ammonium dihydrogen phosphate (an acidic activator that promotes mesopore development), and silica (which regulates pore size distribution) are combined to form a synergistic activation effect, enabling the activated carbon to simultaneously possess abundant micropores and mesopores, forming a multi-level pore synergistic adsorption and improving adsorption performance.

[0034] The type of alkaline activator affects its compounding effect with other components and the overall activation effect of the compound activator. Therefore, this invention studies the types of alkaline activators. Preferably, the alkaline activator is potassium hydroxide to obtain a better activation effect.

[0035] The type of acidic activator can affect its compounding effect with other components and the overall activation effect of the compound activator. Therefore, the present invention has studied the types of acidic activators. Preferably, the acidic activator is ammonium dihydrogen phosphate to obtain a better activation effect.

[0036] The mass concentration of the composite activator affects its activation effect. Therefore, the present invention has studied its mass concentration. Preferably, the mass concentration of the composite activator is 20-30% to obtain a better activation effect.

[0037] In order to ensure that the pretreated raw materials are fully impregnated in the composite activator, the present invention studies the solid-liquid ratio of the pretreated raw materials to the composite activator. Preferably, the solid-liquid ratio of the pretreated raw materials to the composite activator is 1:2-3 to obtain a better impregnation effect.

[0038] Temperature affects the activation effect of the composite activator. Therefore, the present invention has studied the range of preset temperature. Preferably, the preset temperature is 50-60℃ to improve the activation effect.

[0039] In order to ensure that the pretreated raw materials and the composite activator react fully, the present invention has studied the mixing process. Preferably, the mixture is stirred at a preset temperature for 1-2 hours and then allowed to stand and soak for 6-8 hours to obtain a better mixing effect.

[0040] Carbonization conditions affect the performance of activated carbon. Therefore, this invention has studied the carbonization conditions. Preferably, the carbonization conditions are: 300-400℃ under an inert atmosphere for 1-1.5h; the heating rate and holding time are controlled in stages, firstly carbonizing at low temperature to remove volatile components from the raw material to avoid excessive shrinkage of the raw material at high temperature; then activating at high temperature to promote the development of pore structure and ensure that the specific surface area and pore volume meet the standards.

[0041] The activation conditions affect the performance of activated carbon. Therefore, the present invention has studied the activation conditions. Preferably, the activation conditions are: 700-900℃, heat preservation for 2-3 hours, to obtain a better activation effect.

[0042] To avoid oxidation, the present invention performs carbonization or activation under an inert atmosphere. Preferably, the inert atmosphere is nitrogen or argon, and the gas flow rate is 100-150 mL / min, so as to better improve the performance of activated carbon.

[0043] To further remove impurities from activated carbon, the present invention employs acid washing as a post-treatment. Preferably, the acid washing uses hydrochloric acid solution to improve the acid washing effect.

[0044] The acid washing temperature and ultrasonic power affect the performance of activated carbon. Therefore, this invention studies the acid washing temperature and ultrasonic power. Preferably, the acid washing temperature is 40-50℃ and the ultrasonic frequency is 20-30KHz. By combining hydrochloric acid soaking, ultrasonic oscillation, and multiple washing, residual activator and ash are effectively removed, improving product purity and stability.

[0045] More specifically, including:

[0046] Includes the following steps:

[0047] (1) Raw material pretreatment: Agricultural and forestry waste (peony seed meal, soybean meal, walnut shell, soybean straw, peanut shell, etc.) and industrial by-products (steel slag, fly ash, tailings powder, etc.) are mixed at a mass ratio of 3-5:1, crushed to a particle size of 20-40 mesh, soaked in an alkaline solution with a mass fraction of 1-3% for 2-4 hours, then washed with deionized water until neutral, and dried at 80-100℃ until the moisture content is ≤5% to obtain pretreated raw materials;

[0048] (2) Preparation of composite activator: potassium hydroxide, ammonium dihydrogen phosphate and silicon dioxide are mixed in a mass ratio of 4-6:2-3:1, deionized water is added and stirred until completely dissolved to prepare a composite activator solution with a mass fraction of 20-30%;

[0049] (3) Impregnation and mixing: The pretreated raw material obtained in step (1) and the composite activator solution obtained in step (2) are mixed at a solid-liquid ratio of 1:2-3, stirred at a constant temperature of 50-60℃ for 1-2 hours, and then allowed to stand for impregnation for 6-8 hours to obtain the impregnated material;

[0050] (4) Carbonization-activation: The impregnated material obtained in step (3) is placed in a tube furnace under inert gas protection. First, the temperature is raised to 300-400℃ at a heating rate of 5-8℃ / min and held for 1-1.5h for carbonization. Then, the temperature is raised to 700-900℃ at a heating rate of 3-5℃ / min and held for 2-3h for activation. After activation, the material is naturally cooled to room temperature to obtain crude activated carbon.

[0051] (5) Post-processing: Place the crude activated carbon in an ultrasonic oscillator, stir and soak it in a 5-8% hydrochloric acid solution for 1-2 hours to remove impurities, then wash it with deionized water until neutral, dry it at 100-120℃ for 3-4 hours, and pulverize it to a particle size of 80-100 mesh to obtain a multi-porous biomass activated carbon product.

[0052] This invention provides multi-level porous biomass activated carbon prepared by the above-described method.

[0053] Preferred type: multi-level porous biomass activated carbon.

[0054] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0055] In the following examples, the specific surface area, total pore volume, micropore volume, and CO2 adsorption capacity were tested using a specific surface area and pore size analyzer in accordance with the national standard GB / T 19587-2017.

[0056] Example 1

[0057] (1) Raw material pretreatment: Walnut shells and steel slag are mixed at a mass ratio of 4:1, crushed to 30 mesh, soaked in sodium hydroxide solution with a mass fraction of 2% for 3 hours, washed with deionized water until neutral, and dried at 90℃ until the moisture content is 4% to obtain pretreated raw materials;

[0058] (2) Preparation of composite activator: potassium hydroxide, ammonium dihydrogen phosphate and silicon dioxide are mixed in a mass ratio of 5:2.5:1, and deionized water is added to prepare a 25% mass fraction solution to obtain the composite activator;

[0059] (3) Impregnation and mixing: The pretreated raw material prepared in step (1) is mixed with the composite activator solution at a solid-liquid ratio of 1:2.5, stirred at 55°C for 1.5h, and allowed to stand for 7h to obtain the impregnated material;

[0060] (4) Carbonization-activation: The impregnated material prepared in step (1) is heated to 350°C at 6°C / min under nitrogen protection (flow rate 120 mL / min) and kept at the temperature for 1.2 h; then heated to 900°C at 4°C / min and kept at the temperature for 2.5 h; and cooled to room temperature to obtain crude activated carbon.

[0061] (5) Post-processing: The crude activated carbon prepared in step (4) is placed in an ultrasonic oscillator (ultrasonic frequency 20KHz), stirred and soaked in 6% hydrochloric acid at 45℃ for 1.5h, washed with deionized water until neutral, dried at 110℃ for 3.5h, and pulverized to 90 mesh to obtain activated carbon product.

[0062] The product was tested and found to have a specific surface area of ​​1908 m² / g, a total pore volume of 0.93 cm³ / g, and a micropore volume of 0.76 cm³ / g. The product has both micropores smaller than 2 nm and mesopores larger than 2 nm. The carbon dioxide adsorption capacity is 4.43 mmol / g at 0℃ and 2.98 mmol / g at 25℃.

[0063] Example 2

[0064] (1) Raw material pretreatment: Peanut shells and fly ash are mixed at a mass ratio of 3:1, crushed to 20 mesh, soaked in 1% potassium hydroxide solution for 2 hours, washed with deionized water until neutral, and dried at 80℃ until the moisture content is 5% to obtain pretreated raw materials;

[0065] (2) Preparation of composite activator: potassium hydroxide, ammonium dihydrogen phosphate and silicon dioxide are mixed in a mass ratio of 4:2:1 to prepare a 20% mass fraction solution to obtain the composite activator;

[0066] (3) Impregnation and mixing: The pretreated raw material prepared in step (1) and the composite activator solution are mixed at a solid-liquid ratio of 1:2, stirred at 50°C for 1 hour, and allowed to stand for 6 hours to obtain the impregnated material;

[0067] (4) Carbonization-activation: The impregnated material prepared in step (3) is heated to 300℃ at 5℃ / min under argon protection (flow rate 100mL / min) and kept at 1h; then heated to 700℃ at 3℃ / min and kept at 2h to obtain crude activated carbon.

[0068] (5) Post-processing: The crude activated carbon prepared in step (4) is placed in an ultrasonic oscillator (ultrasonic frequency 25KHz), stirred and soaked in 5% hydrochloric acid at 40℃ for 1h, washed until neutral, dried at 100℃ for 3h, and pulverized to 80 mesh to obtain activated carbon product.

[0069] Test results: The product has a specific surface area of ​​2391 m² / g, a total pore volume of 1.18 cm³ / g, and a micropore volume of 0.83 cm³ / g. The product has both micropores smaller than 2 nm and mesopores larger than 2 nm. The carbon dioxide adsorption capacity is 5.56 mmol / g at 0℃ and 3.74 mmol / g at 25℃.

[0070] Comparative Example 1

[0071] The difference from Example 1 is that in step (2), silicon dioxide was not added, and potassium hydroxide and ammonium dihydrogen phosphate were used in a mass ratio of 5:2.5, while the total amount of activator remained unchanged.

[0072] Test results: The product has a specific surface area of ​​1502 m² / g, a total pore volume of 0.71 cm³ / g, and a micropore volume of 0.49 cm³ / g. The product has both micropores smaller than 2 nm and mesopores larger than 2 nm. The carbon dioxide adsorption capacity is 3.81 mmol / g at 0℃ and 2.17 mmol / g at 25℃.

[0073] Comparative Example 2

[0074] The difference from Example 1 is that in step (2), ammonium dihydrogen phosphate was not added, potassium hydroxide and silicon dioxide were in a mass ratio of 5:1, and the total amount of activator remained unchanged.

[0075] Test results: The product has a specific surface area of ​​1626 m² / g, a total pore volume of 0.69 cm³ / g, a micropore volume of 0.59 cm³ / g, and the pore size is mainly concentrated within 2 nm. The carbon dioxide adsorption capacity is 3.74 mmol / g at 0℃ and 2.36 mmol / g at 25℃.

[0076] Comparative Example 3

[0077] The difference from Example 1 is that no ultrasonic treatment was performed in step (5).

[0078] Test results: The product has a specific surface area of ​​1791 m² / g, a total pore volume of 0.75 cm³ / g, and a micropore volume of 0.61 cm³ / g. The product has both micropores smaller than 2 nm and mesopores larger than 2 nm. The carbon dioxide adsorption capacity is 4.19 mmol / g at 0℃ and 2.73 mmol / g at 25℃.

[0079] As can be seen from the comparison between Example 1 and Comparative Examples 1 and 2, compared with binary composite activators, ternary composite activators composed of potassium hydroxide, ammonium dihydrogen phosphate and silicon dioxide can significantly increase the specific surface area, total pore volume and micropore volume of activated carbon, and also significantly improve the adsorption performance of carbon dioxide.

[0080] In addition, the combination of ammonium dihydrogen phosphate and silicon dioxide, based on potassium hydroxide, has a synergistic effect in improving the specific surface area, porosity, adsorption performance and hollow formation of activated carbon, thus better improving the performance of activated carbon.

[0081] As can be seen from the comparison between Example 1 and Comparative Example 3, ultrasonic treatment can further increase the specific surface area, total pore volume and micropore volume of activated carbon, and at the same time, the adsorption performance is also improved.

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing multi-level porous biomass activated carbon, characterized in that, include: Nitrogen-rich agricultural and forestry waste is mixed evenly with industrial by-products, crushed, soaked in an alkaline solution, washed, and dried to obtain pretreated raw materials. A composite activator is obtained by uniformly mixing an alkaline activator, an acidic activator, and silica in a solvent. The pretreated raw material is impregnated in a composite activator, mixed evenly, and reacted at a preset temperature to obtain the impregnated material. The impregnated material is carbonized and activated to obtain crude activated carbon. The crude activated carbon is placed in an ultrasonic oscillator and soaked in a 5-8% hydrochloric acid solution for 1-2 hours to remove impurities. It is then washed with deionized water until neutral and dried to obtain multi-level porous biomass activated carbon. The alkaline activator is potassium hydroxide; The acidic activator is ammonium dihydrogen phosphate; The mass concentration of the composite activator is 20-30%.

2. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The nitrogen-rich agricultural and forestry waste is selected from at least one of peony seed meal, soybean meal, walnut shells, soybean straw, and peanut shells.

3. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The industrial by-products are selected from at least one of steel slag, fly ash, and tailings powder.

4. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution.

5. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The mass ratio of the alkaline activator, acidic activator, and silicon dioxide is 4-6:2-3:

1.

6. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The solid-liquid ratio of the pretreated raw material to the composite activator is 1:2-3.

7. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The preset temperature is 50-60℃; Stir at the preset temperature for 1-2 hours, then let it stand and soak for 6-8 hours.

8. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The carbonization conditions are: 300-400℃ under an inert atmosphere, for 1-1.5 hours.

9. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The activation conditions are: 700-900℃, heat treatment for 2-3 hours.

10. The method for preparing multi-level porous biomass activated carbon as described in claim 8, characterized in that, The inert atmosphere is nitrogen or argon, and the gas flow rate is 100-150 mL / min.

11. The method for preparing multi-level porous biomass activated carbon as described in claim 1, characterized in that, The ultrasonic frequency is 20-30KHz.

12. The multi-level porous biomass activated carbon prepared by the method according to any one of claims 1-11.

13. The application of the multi-level porous biomass activated carbon according to claim 12 in the adsorption and capture of carbon dioxide, characterized in that, The adsorption temperature is 0-50℃.

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