Template-guided CO2 mineralization biomimetic ceramic material and its preparation method

Abstract

The disclosure provides a CO2 mineralization biomimetic ceramic material based on template guidance and a preparation method. The preparation method comprises the following steps: using a polymer sponge with a three-dimensional interconnected pore structure as an initial template, and pretreating the initial template; immersing the pretreated initial template in a solution containing soluble calcium salt and / or magnesium salt, and obtaining a composite wet gel loaded with metal ions through immersion treatment; placing the composite wet gel in a high-pressure reaction kettle, and introducing CO2 gas for mineralization reaction to generate corresponding carbonate minerals, the carbonate minerals nucleate and grow in situ and uniformly on the surface of the initial template, and are connected and bridged with adjacent growing carbonate minerals to form a continuous three-dimensional network inorganic mineral composite wrapping the initial template; and the three-dimensional network inorganic mineral composite is subjected to heat treatment and sintering treatment to obtain a lightweight ceramic-based composite material with a biomimetic three-dimensional continuous network structure, and the process is simple and the structure of the material is controllable.

Description

Technical Field

[0001] This disclosure belongs to the technical field of inorganic non-metallic materials, biomimetic materials and composite materials, specifically relating to a template-guided CO2 mineralization biomimetic ceramic material and its preparation method. Background Technology

[0002] Lightweight ceramic materials, due to their low density, high temperature resistance, good chemical stability, and excellent thermal insulation and flame retardant properties, have broad application prospects in aerospace, building insulation, industrial energy conservation, and fireproofing materials. Traditional methods for preparing lightweight ceramics (such as foam ceramics and ceramic aerogels) mainly rely on direct foaming, particle stacking, or sol-gel methods, but these methods generally suffer from the following bottlenecks: Numerous structural defects: Ceramic skeletons obtained by traditional methods often exhibit inhomogeneous structures, poor pore connectivity, and fragile skeleton ribs (or pore walls), resulting in low overall material strength and high brittleness, especially at low densities where it is difficult to balance strength and thermal insulation performance. Complex processes and high energy consumption: Many methods involve complex template removal processes (such as high-temperature, long-term calcination), expensive raw materials, or specialized equipment, leading to high production costs and energy consumption. Furthermore, the material's structural controllability is poor, making it difficult to precisely design and control the structure of the internal three-dimensional interconnected network to optimize mechanical properties and functional characteristics.

[0003] To address the aforementioned issues, this disclosure proposes an innovative process that combines the concepts of "template-guided mineralization" and "CO2 mineralization and sequestration" to solve the aforementioned technical challenges. Summary of the Invention

[0004] This disclosure aims to at least solve one of the technical problems existing in the prior art, and to provide a template-guided CO2 mineralization biomimetic ceramic material and its preparation method.

[0005] One aspect of this disclosure provides a method for preparing template-guided CO2 mineralization biomimetic ceramic materials, the preparation method comprising: A polymer sponge with a three-dimensional interconnected pore structure was used as an initial template and pretreated. The pretreated initial template is immersed in a solution containing soluble calcium salt and / or magnesium salt. Through the immersion treatment, the metal solution permeates and adsorbs onto the surface and interior of the three-dimensional interconnected pore structure of the initial template, resulting in a composite wet gel loaded with metal ions. The composite wet gel is placed in a high-pressure reactor and CO2 gas is introduced to carry out a mineralization reaction to generate the corresponding carbonate minerals. The carbonate minerals nucleate and grow in situ and uniformly on the surface of the initial template, and connect and bridge with the adjacent growing carbonate minerals to form a continuous three-dimensional network inorganic mineral composite that encapsulates the initial template. The three-dimensional network inorganic mineral composite material is subjected to heat treatment to remove the initial template and then sintered to obtain a lightweight ceramic matrix composite material with a biomimetic three-dimensional continuous network structure.

[0006] Optionally, in the mineralization reaction, the partial pressure of CO2 is controlled at 1-3 MPa, the mineralization temperature at 35-90°C, and the mineralization time at 12-60 h.

[0007] Optionally, the soluble calcium salt is calcium chloride, and the soluble magnesium salt is magnesium chloride.

[0008] Optionally, the polymer sponge is a melamine resin sponge.

[0009] Optionally, the heat treatment includes: The process is carried out in air or an inert atmosphere, with the temperature increased to 400-800°C at a rate of 1-5°C / min and held for 1-4 hours.

[0010] Optionally, the sintering treatment is performed at a temperature of 600-1200°C for 1-6 hours.

[0011] Optionally, the initial template is preprocessed, including: The initial template is subjected to surface hydrophilization treatment or alkali treatment.

[0012] In another aspect of this disclosure, a template-guided CO2 mineralization biomimetic ceramic material is proposed, which is prepared using the preparation method described above.

[0013] Optionally, the template-guided CO2 mineralization biomimetic ceramic material has a complete and continuous three-dimensional network structure.

[0014] This disclosure proposes a template-guided CO2 mineralization biomimetic ceramic material and its preparation method, which has the following advantages compared with the prior art: 1. Unlike traditional methods where ceramic particles are simply filled or coated in template voids, this disclosure proposes a method for preparing lightweight ceramic composite materials that is simple in process, structurally controllable, and has excellent performance. It is the first to propose the concept of "template-guided CO2 mineralization growth of a three-dimensional continuous inorganic network". Inorganic materials are grown in situ on the surface of template fibers by mineralization reaction, and they are interconnected by growth control, thereby replicating and transforming a structurally complete and mechanically interlocked three-dimensional continuous ceramic network. This biomimetic structure fundamentally improves the strength and toughness of lightweight ceramics. 2. This disclosure integrates the functions of "structural template", "carbon source" and "mineralized substrate" into one template, which simplifies the process flow. In addition, the mineralization process not only builds an enhanced network, but also realizes the fixation of CO2, which has a certain environmental protection concept. 3. This disclosure utilizes CO2 mineralization reaction to construct inorganic networks in a low-temperature and aqueous solution environment, with low energy consumption and mild conditions. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating a specific embodiment of the preparation method of template-guided CO2 mineralization biomimetic ceramic materials disclosed herein. Figure 2 This is a scanning electron microscope image of the CO2 mineralized biomimetic ceramic material of Embodiment 2 of this disclosure. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this disclosure and represent a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the protection scope of this disclosure.

[0017] As shown in Figure 1, one aspect of this disclosure provides a method S100 for preparing template-guided CO2 mineralized biomimetic ceramic materials, specifically including the following steps S110~S140: S110. A polymer sponge with a three-dimensional interconnected pore structure is used as an initial template and pretreated.

[0018] In step S110, it is preferable to perform a surface hydrophilic treatment (alkali treatment) on the initial template to enhance its wettability to the subsequent mineralization precursor solution. For example, prepare a 0.1 mol / L sodium hydroxide aqueous solution, immerse the sponge in the sodium hydroxide aqueous solution for 20 min, and then rinse with deionized water to remove residual alkali.

[0019] This embodiment uses a polymer sponge as an initial template. Its inherent three-dimensional interconnected porous structure provides a precise structural prototype for the final ceramic material. At the same time, it provides a huge specific surface area and reaction sites for subsequent metal ion adsorption and CO2 mineralization reactions. Cellulose, as an organic carbon source, decomposes during subsequent heat treatment, which helps to construct a porous framework.

[0020] In some preferred embodiments, the polymer sponge may preferably be a melamine resin sponge.

[0021] S120. The pretreated initial template is immersed in a solution containing soluble calcium salt and / or magnesium salt. Through the immersion treatment, the metal solution penetrates and adsorbs onto the surface and interior of the three-dimensional interconnected pore structure of the initial template. Then, excess solution is gently squeezed out to obtain a composite wet gel with uniformly loaded metal ions.

[0022] In step S120, the soluble calcium salt can be calcium chloride, and the soluble magnesium salt can be magnesium chloride.

[0023] In step S120, the impregnation treatment can be performed using vacuum-assisted impregnation or a long-term immersion method. When using vacuum-assisted impregnation, the immersion time is preferably 3-5 hours, for example, more preferably 4 hours. When using long-term immersion, the immersion time is preferably 1-3 days, for example, preferably 2 days. Vacuum-assisted impregnation or long-term static immersion can effectively overcome the surface tension of the pores inside the aerogel, allowing the metal ion solution to fully penetrate the entire complex network, fundamentally avoiding the problem of uneven mineral growth caused by uneven loading.

[0024] S130. The composite wet gel is placed in a high-pressure reactor, and CO2 gas is introduced into the reaction solution to carry out a mineralization reaction, generating the corresponding carbonate minerals. The carbonate minerals nucleate and grow in situ and uniformly on the surface of the initial template, and connect and bridge with the adjacent grown carbonate minerals to form a continuous three-dimensional inorganic mineral network that encapsulates the initial template.

[0025] In step S130, during the mineralization reaction, the CO2 partial pressure is controlled at 0.1-5 MPa, the mineralization temperature at 20-120°C, and the mineralization time at 1-72 h. By actively and synergistically controlling the above three key parameters, the nucleation rate, growth morphology, crystallinity, and network bridging degree of the mineral can be precisely controlled, thereby achieving the regulation of the final material's mechanical properties.

[0026] In step S130, under a CO2 atmosphere, CO2 dissolves in the residual moisture in the template pores to form carbonate ions, which then react with metal ions on the template framework to generate corresponding carbonate minerals (such as calcite, aragonite, or amorphous calcium carbonate). These minerals grow in situ and layer by layer on the template fiber surface, and as the growth thickness increases, they connect and bridge with minerals growing on adjacent fibers, ultimately forming a continuous three-dimensional network of inorganic minerals encapsulating the original template within the template.

[0027] S140. The three-dimensional network inorganic mineral composite material is subjected to heat treatment to remove the initial template and then subjected to sintering to obtain a lightweight ceramic matrix composite material with a biomimetic three-dimensional continuous network structure.

[0028] In step S140, the composite is placed in a muffle furnace or tube furnace for heat treatment. The process parameters for heat treatment are as follows: the heat treatment is carried out in air or an inert atmosphere, with the temperature increased to 400-800°C at a rate of 1-5°C / min, and held for 1-4 hours. Of course, the temperature here can be set according to the template decomposition temperature to completely decompose and remove the initial template.

[0029] In this embodiment, during the aforementioned low-temperature heat treatment stage, the polymer sponge serving as the sacrificial template is completely thermally decomposed and removed, leaving behind a hollow, precise three-dimensional ceramic network skeleton composed of inorganic minerals. In other words, through gradient heat treatment, the final product is a completely inorganic ceramic matrix composite material, containing no organic phase, and therefore exhibits excellent high-temperature resistance, oxidation resistance, and chemical stability.

[0030] In step S140, the sintering temperature is 600-1200°C, and the time is 1-6 hours. Similarly, the sintering temperature here should be determined according to the sintering temperature of the target ceramic to allow the remaining inorganic mineral network to undergo densification sintering, transforming it into a ceramic phase with higher strength (such as calcium oxide / magnesium oxide, which can be further carbonized or stabilized, or directly retained as a thermally stable carbonate / composite ceramic phase), ultimately obtaining the target lightweight ceramic composite material.

[0031] In this embodiment, during the aforementioned high-temperature sintering stage, the inorganic mineral network undergoes densification sintering, the interparticle bonding force is enhanced, and some minerals may undergo phase transformation (such as calcium carbonate decomposing into calcium oxide), forming strong chemical bonds, and ultimately transforming into a pure ceramic phase with higher strength, hardness and thermal stability, significantly improving the compressive strength of the material.

[0032] This disclosure uses a polymer sponge with a three-dimensional interconnected porous structure as an initial template. This initial template serves three functions: a three-dimensional sacrificial template, a carbon source, and a mineralization reaction substrate. It is then impregnated with a substrate rich in calcium ions (Ca). 2 + ) and / or magnesium ions (Mg 2+ The solution was placed in a CO2 environment. By precisely controlling the mineralization conditions, the dissolved CO2 reacted with metal ions to generate inorganic minerals such as calcium carbonate (CaCO3) or magnesium carbonate (MgCO3), which then nucleated and grew in situ and uniformly on the surface of the template fiber / skeleton. As mineralization progressed, the inorganic materials growing on adjacent fibers connected and overlapped, eventually constructing a continuous, complete, and template-encapsulating three-dimensional inorganic mineral network within the template. Finally, the organic template was removed by heat treatment, and the inorganic mineral network was sintered to obtain a lightweight ceramic matrix composite material with a biomimetic three-dimensional continuous network structure.

[0033] Another aspect of this disclosure proposes a template-guided CO2 mineralization biomimetic ceramic material, which is prepared using the preparation method described above. For details of the preparation process, please refer to the above description, which will not be repeated here.

[0034] It should be understood that the template-guided CO2 mineralization biomimetic ceramic material presented in this embodiment has a complete and continuous three-dimensional network structure.

[0035] The preparation method of template-guided CO2 mineralization biomimetic ceramic materials will be further explained below with reference to specific embodiments: Example 1 S1: Preparation and pretreatment of three-dimensional porous template: A polymer sponge with a three-dimensional interconnected pore structure is used, and its surface is hydrophilicated to enhance its wettability to the subsequent mineralization precursor solution.

[0036] S2: Loading of the mineralized precursor solution: The pretreated template is impregnated in a calcium chloride solution. Vacuum-assisted impregnation allows the metal ion solution to fully penetrate and adsorb onto the entire surface and interior of the template's three-dimensional network framework. Subsequently, excess solution can be gently squeezed out to obtain a uniformly loaded composite wet gel.

[0037] S3: CO2-induced in-situ mineralization: A template loaded with metal ions is placed in a high-pressure reactor. CO2 gas is introduced into the vessel, and the partial pressure of CO2 is controlled at 0.5 MPa, the mineralization temperature at 70°C, and the mineralization time at 48 hours. Under the CO2 atmosphere, CO2 dissolves in the residual moisture in the template pores to form carbonate ions, which then react with the metal ions on the template framework to generate corresponding carbonate minerals (such as calcite, aragonite, or amorphous calcium carbonate). These minerals grow in situ and layer by layer on the surface of the template fibers. As the growth thickness increases, they connect and bridge with minerals growing on adjacent fibers, ultimately forming a continuous three-dimensional inorganic mineral network inside the template that encapsulates the original template.

[0038] S4: Heat Treatment and Ceramization: The mineralized composite is dried and then placed in a muffle furnace or tube furnace for heat treatment. The heat treatment is carried out in air or an inert atmosphere, and the procedure is as follows: the temperature is increased to 600°C at a rate of 5°C / min (determined according to the thermal decomposition temperature of the template), and held for 1-4 hours to completely decompose and remove the organic template; then the temperature is increased to 900°C (determined according to the sintering temperature of the target ceramic), and held for 4 hours to densify and sinter the remaining inorganic mineral network, transforming it into a ceramic phase with higher strength (such as calcium oxide / magnesium oxide, which can be further carbonized or stabilized, or directly retained as a thermally stable carbonate / composite ceramic phase), finally obtaining the target lightweight ceramic composite material.

[0039] Based on the reaction conditions of this embodiment, the reaction driving force is weak, the mineralization rate is slow, the mineral layer is thin and uneven, and the impact on the final ceramic compressive strength is low, with a compressive strength of about 2.5 MPa. Furthermore, the formed ceramic material network is discontinuous and the skeleton is weak.

[0040] Example 2 The preparation method in this embodiment is the same as that in Example 1, except that the partial pressure of CO2 is 2.0 MPa.

[0041] Based on the reaction conditions of this embodiment, the reaction driving force is moderate, the minerals grow uniformly on the fiber surface and are effectively bridged, the ceramic compressive strength is 8.0 MPa, and the formed ceramic material has a complete and continuous network structure.

[0042] like Figure 2 As shown, the template-guided CO2 mineralization biomimetic ceramic material prepared in this embodiment has a complete and continuous three-dimensional network structure.

[0043] Example 3 The preparation method in this embodiment is the same as that in Example 1, except that the partial pressure of CO2 is 4.0 MPa.

[0044] Based on the reaction conditions of this embodiment, if the reaction driving force is too strong, it may quickly generate a loose accumulation of mineral particles rather than a dense coating. The effect on the final compressive strength of the ceramic first increases and then decreases, with a compressive strength of about 6.5 MPa. Furthermore, the formed ceramic material mineral layer is relatively thick but has weak bonding force, making it prone to defects after calcination.

[0045] Example 4 The preparation method in this embodiment is the same as that in Example 1, except that the mineralization temperature is 25°C.

[0046] Based on the reaction conditions of this embodiment, the reaction is slow and the crystal growth time is long, which may result in the formation of stable but incompletely grown crystals. This has a low impact on the final compressive strength of the ceramic, which is approximately 4.0 MPa. Furthermore, the bridging of the formed ceramic material network may be insufficient, resulting in incomplete integrity.

[0047] Example 5 The preparation method in this embodiment is the same as that in Example 1, except that the mineralization temperature is 60°C.

[0048] Based on the reaction conditions of this embodiment, the kinetic conditions are suitable, which is conducive to the formation of a well-bonded and well-bridged mineral layer. The ceramic compressive strength is 8.0 MPa, and the formed ceramic optimizes the crystal nucleation and growth rate, resulting in high network quality.

[0049] Example 6 The preparation method in this embodiment is the same as that in Example 1, except that the mineralization temperature is 100℃.

[0050] Based on the reaction conditions of this embodiment, the reaction is fast and may produce a more thermodynamically stable crystal form (such as calcite), but the crystal morphology is poorly controllable, the ceramic compressive strength is 7.0 MPa, and high temperature may cause local deformation of the template, affecting uniformity; the strength depends on the degree of interlocking between crystals.

[0051] Example 7 The preparation method in this embodiment is the same as that in Example 1, except that the mineralization time is 6 hours.

[0052] Based on the reaction conditions of this embodiment, the mineral layer is too thin, only covering the surface of the template, and no effective connection is formed between the fibers. This has a very low impact on the compressive strength of the ceramic, which is about 1.5 MPa. It forms a "hollow tube" skeleton, which is very easy to collapse after calcination.

[0053] Example 8 The preparation method in this embodiment is the same as that in Example 1, except that the mineralization time is 24 hours.

[0054] Based on the reaction conditions of this embodiment, the mineral layer thickness is moderate, and the minerals on adjacent fibers are fully bridged to form a stable network. Its ceramic compressive strength is 8.0 MPa, realizing the complete replication and enhancement of the structure from organic to inorganic network.

[0055] Example 9 The preparation method in this embodiment is the same as that in Example 1, except that the mineralization time is 72 hours.

[0056] Based on the reaction conditions of this embodiment, if the formed mineral layer is too thick, it may cause pore blockage and microcracks due to internal stress. This will first increase and then decrease the compressive strength of the ceramic, which is about 5.5 MPa. An excessively thick mineral layer will have large shrinkage stress during calcination, making it prone to cracking and reducing the overall strength.

[0057] Example 10 The preparation method in this embodiment is the same as in Example 1, except that the pretreated template is immersed in a solution of pure calcium chloride.

[0058] Based on the reaction conditions of this embodiment, calcium carbonate (such as calcite) is generated, which has high hardness. However, after calcination to CaO, it is easily hydrated and has a large volume shrinkage, which has a high impact on the compressive strength of the ceramic. Its compressive strength is about 8.0 MPa, and the resulting ceramic material has high initial strength.

[0059] Example 11 The preparation method in this embodiment is the same as in Example 1, except that: the pretreated template is immersed in a solution of calcium chloride and magnesium chloride, and Ca... 2+ and Mg 2+ The molar ratio is 1:1.

[0060] Based on the reaction conditions of this embodiment, a (calcium, magnesium) carbonate solid solution or mixed phase is formed, with smaller crystal size and more uniform distribution, which has the greatest impact on the compressive strength of the ceramic, with a compressive strength of approximately 10.5 MPa. 2+ The doping effect refines the grains, inhibits excessive growth, enhances network toughness, and reduces sintering shrinkage.

[0061] Example 12 The preparation method in this embodiment is the same as in Example 1, except that the pretreated template is immersed in a solution of pure magnesium chloride.

[0062] Based on the reaction conditions of this embodiment, basic magnesium carbonate or amorphous magnesium carbonate is generated. After calcination, it forms MgO with a high melting point and high stability. It has a moderate effect on the compressive strength of ceramics, with a compressive strength of about 5.5 MPa. The initial mineral strength is low, but the ceramic phase (MgO) has excellent thermal stability and a high high-temperature strength retention rate.

[0063] Table 1 Parameters and results of each embodiment

[0064] In summary, when the CO2 partial pressure is low, the mineralization rate is slow, the formed inorganic network is discontinuous and the skeleton is weak, resulting in low compressive strength of the final ceramic. When the CO2 partial pressure is high, the reaction driving force is too strong, which easily forms loose mineral accumulation rather than a dense coating, resulting in defects after calcination, causing the compressive strength to increase first and then decrease. Therefore, the CO2 partial pressure can be preferably 1-3 MPa, for example, 2.0 MPa is even more preferred, with moderate mineralization reaction, uniform growth and effective bridging of inorganic minerals on the template fiber surface, forming a continuous and complete network, resulting in optimal compressive strength.

[0065] Secondly, at lower mineralization temperatures, the reaction is slow, crystal growth is incomplete, network bridging is insufficient, and compressive strength is low. At higher mineralization temperatures, the reaction rate is fast, but it may cause local deformation of the template, affecting uniformity and resulting in inconsistent compressive strength. Therefore, the preferred mineralization temperature is 35-90℃, for example, 60℃ can be further preferred, which is conducive to the formation of a firmly bonded and well-bridging mineral layer, resulting in high network quality and optimal compressive strength.

[0066] Furthermore, when the mineralization time is too short, the resulting mineral layer is too thin, and the fibers do not form effective connections, resulting in a hollow skeleton that is prone to collapse after calcination and has very low compressive strength. On the other hand, when the mineralization time is too long, the resulting mineral layer is too thick, which easily leads to pore blockage and microcracks. After calcination, the shrinkage stress is large, and the compressive strength increases first and then decreases. Therefore, the mineralization time is preferably 12-60 hours, for example, 24 hours can be further preferred. Within this time, the thickness of the formed mineral layer is moderate, the fibers are fully bridged, a stable network is formed, and the compressive strength reaches the optimal level.

[0067] In addition, immersing the pretreated initial template in a solution containing soluble calcium and magnesium salts in a 1:1 ratio can refine the grains and enhance the network toughness, making it the best choice for optimizing compressive strength and thermal stability.

[0068] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A method for preparing template-guided CO2 mineralization biomimetic ceramic materials, characterized in that, The preparation method includes: A polymer sponge with a three-dimensional interconnected pore structure was used as an initial template and pretreated. The pretreated initial template is immersed in a solution containing soluble calcium salt and / or magnesium salt. Through the immersion treatment, the metal solution permeates and adsorbs onto the surface and interior of the three-dimensional interconnected pore structure of the initial template, resulting in a composite wet gel loaded with metal ions. The composite wet gel is placed in a reaction vessel and CO2 gas is introduced to carry out a mineralization reaction to generate the corresponding carbonate minerals. The carbonate minerals nucleate and grow in situ and uniformly on the surface of the initial template, and connect and bridge with the adjacent growing carbonate minerals to form a continuous three-dimensional network inorganic mineral composite that encapsulates the initial template. The three-dimensional network inorganic mineral composite material is subjected to heat treatment to remove the initial template and then sintered to obtain a lightweight ceramic matrix composite material with a biomimetic three-dimensional continuous network structure.

2. The preparation method according to claim 1, characterized in that, In the mineralization reaction, the partial pressure of CO2 is controlled at 1-3 MPa, the mineralization temperature at 35-90°C, and the mineralization time at 12-60 h.

3. The preparation method according to claim 1, characterized in that, The soluble calcium salt is calcium chloride, and the soluble magnesium salt is magnesium chloride.

4. The preparation method according to claim 1, characterized in that, The polymer sponge is a melamine resin sponge.

5. The preparation method according to claim 1, characterized in that, The heat treatment includes: The process is carried out in air or an inert atmosphere, with the temperature increased to 400-800°C at a rate of 1-5°C / min and held for 1-4 hours.

6. The preparation method according to claim 1, characterized in that, The sintering process is carried out at a temperature of 600-1200°C for 1-6 hours.

7. The preparation method according to claim 1, characterized in that, Preprocessing of the initial template includes: The initial template is subjected to surface hydrophilization treatment or alkali treatment.

8. A template-guided CO2 mineralization biomimetic ceramic material, characterized in that, Template-guided CO2 mineralization biomimetic ceramic materials are prepared using the preparation method described in any one of claims 1 to 7.

9. The biomimetic ceramic material according to claim 8, characterized in that, The template-guided CO2 mineralization biomimetic ceramic material has a complete and continuous three-dimensional network structure.

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