Geopolymer cementitious material with adsorption-catalysis function prepared by synergism of multiple solid wastes and preparation method of geopolymer cementitious material

Abstract

The invention provides a geopolymer cementitious material with adsorption-catalysis functions prepared by synergism of multiple solid wastes and a preparation method thereof. The geopolymer cementitious material is prepared from the following materials in percentage by mass: 30-50% of geopolymer solid wastes, 20-30% of catalytic potential solid wastes, 15-30% of alkaline solid wastes and 2-4% of a template agent. The invention has the following beneficial effects: (1) multi-solid waste resource utilization synergy: through the combined action of the geopolymer matrix, the industrial solid waste activation component and the template agent, multiple functions of cementation, adsorption, catalysis and the like are integrated, and the comprehensive performance of material environment restoration is improved; (2) the pore structure is accurately regulated and controlled: an ordered or semi-ordered porous structure is constructed by introducing a template agent, the mass transfer and reaction efficiency of pollutants is improved, and meanwhile, the mechanical property of the material is kept good; (3) the process is simple, convenient and adjustable, the adaptability is high, raw materials are wide in source, the preparation process is green and efficient, and the method is suitable for treatment of different types of pollutants and site remediation.

Description

Technical Field

[0001] This invention relates to the field of environmental protection materials technology, and in particular to a geopolymer cementitious material with adsorption-catalysis function prepared by synergistic preparation of multiple solid wastes, and its preparation method. Background Technology

[0002] With the acceleration of urbanization, a large amount of urban construction and industrial production activities have generated a wide variety of solid wastes. These solid wastes are often rich in silicon and aluminum sources, metal oxides, and alkaline components, possessing the potential for high-value utilization. If not properly treated, they not only waste resources but may also cause serious ecological problems such as heavy metal leakage, alkaline pollution, and groundwater eutrophication. Therefore, the resource utilization of solid waste has become an important issue that urgently needs to be addressed.

[0003] In recent years, industrial solid waste resource utilization technologies have been widely applied in building materials, road foundations, and other fields. Geopolymer-based cementitious materials have attracted much attention due to their excellent structural strength, corrosion resistance, and environmental friendliness. However, traditional applications mainly focus on structural support and have not fully explored the synergistic potential of various types of solid waste in environmental functions such as catalytic degradation and adsorption and fixation of pollutants, nor have they established a system mechanism for the synergistic coupling of multiple types of solid waste. Therefore, it is urgent to develop new material systems with multifunctional response capabilities to realize the transformation of solid waste from "passive landfill" to "active purification."

[0004] Problems and shortcomings of existing technologies: (1) Limited functions and limited application scenarios for resource utilization: Traditional solid waste cementitious materials are mainly used for structural support, lacking ecological and functional properties, and cannot meet the increasingly complex needs of pollution control and resource reuse.

[0005] (2) The functions of the multi-component solid waste have not been fully explored: the method of industrial solid waste mixing is crude, and the catalytic potential of metal oxides and the synergistic effect between solid wastes have not been fully mobilized, and the functional value has not been effectively stimulated.

[0006] (3) Lack of functional design concept: Currently, conventional inorganic admixture materials are mostly used, and materials with structure guidance and functional enhancement are not introduced, making it impossible to achieve orderly control of structure and synergistic integration of functions.

[0007] (4) Lack of systematic methods for the synergistic use of multi-source solid waste: Current technology has not yet established a classification and combination strategy and synergistic optimization mechanism for different types of industrial solid waste, making it difficult to take into account structural performance, reactivity and environmental adaptability. Summary of the Invention

[0008] To address the problems in the prior art, this invention provides a geopolymer cementitious material with adsorption-catalytic function prepared by synergistic preparation of multiple solid wastes, composed of the following materials in corresponding mass fractions: Geopolymer solid waste 30-50% Catalytic potential of solid waste is 20-30%. Alkaline solid waste 15-30% Template agent 2-4%.

[0009] As a further improvement of the present invention, the geopolymer solid waste is selected from at least one of fly ash, slag, and metakaolin; or the geopolymer solid waste is a mixture of fly ash and slag, a mixture of fly ash and metakaolin, a mixture of slag and metakaolin, or a mixture of fly ash, slag, and metakaolin.

[0010] As a further improvement of the present invention, the catalytic potential solid waste is selected from at least one of steel slag, manganese slag, and red mud; or the catalytic potential solid waste is a mixture of steel slag and manganese slag, steel slag and red mud, manganese slag and red mud, or a mixture of steel slag, manganese slag, and red mud.

[0011] As a further improvement of the present invention, the alkaline solid waste is selected from at least one of carbide slag, desulfurization ash, and red mud; or the alkaline solid waste is a mixture of carbide slag and desulfurization ash, carbide slag and red mud, desulfurization ash and red mud, or a mixture of carbide slag, desulfurization ash, and red mud.

[0012] As a further improvement of the present invention, the template agent is a mixture of Pluronic P123 and F127, or CTAB, which forms an ordered or semi-ordered mesoporous framework structure through a self-assembly mechanism.

[0013] As a further improvement of the present invention, the Pluronic P123 and the F127 are mixed at a mass ratio of 1:1.

[0014] This invention also discloses a method for preparing a geopolymer cementitious material, comprising the following steps: Step 1, solid waste pretreatment: Dry and grind geopolymer solid waste, catalytic potential solid waste, and alkaline solid waste to ensure that the particle size is less than 75μm; Step 2, Calculation of water addition: The water-ash mass ratio is 30%-40% of the total dry weight of the added solid waste; Step 3, Preparation of alkaline activation solution: Add the total amount of water calculated in Step 2 to the alkaline activation solid waste powder ground in Step 1, stir for a set time until completely dissolved to form a uniform alkaline activation solid waste solution; Step 4, Mixing solid waste and template agent: Mix geopolymer solid waste, catalytic potential solid waste and template agent according to the specified ratio to obtain mixed solid waste and template agent powder. The ratio of geopolymer solid waste is 30-50%, the ratio of catalytic potential solid waste is 20-30%, and the ratio of template agent is 2-4%. The percentages are the percentages of each component to the total mass of the mixed solid waste and template agent powder. Step 5, Mixing and stirring: Pour the alkaline activated solid waste solution from Step 3 into the mixed solid waste and template agent powder from Step 4, and stir with a mechanical stirrer for a set time to ensure that the materials are mixed evenly; Step 6, Injection Molding: The alkaline activated solid waste solution and the mixture of mixed solid waste and template agent powder, which were uniformly stirred in Step 5, are injected into the mold for molding.

[0015] As a further improvement of the present invention, the method further includes the following after step 6: Step 7, Preliminary curing and demolding: Perform preliminary curing for a set time in an environment with 90% humidity and 25℃, and demold after molding; Step 8, Post-curing: Continue curing the molded material in an environment with 90% humidity and 25°C for a set time until it reaches the required strength and stability.

[0016] As a further improvement of the present invention, in step 3, the stirring time is 10 minutes; in step 7, the time is set to 1 day.

[0017] As a further improvement to the present invention, the following steps are performed after step 7: Further steps to enhance catalytic activity: calcination at 400-500℃ for 1-2 hours; In step 8, the time period is set to 28 days.

[0018] The beneficial effects of this invention are: (1) Synergistic utilization of multiple solid waste resources: Through the combined action of geopolymer matrix, industrial solid waste activating components and template agent, multiple functions such as cementation, adsorption and catalysis are integrated, which improves the comprehensive performance of material environmental remediation; (2) Precise control of pore structure: The introduction of template agent constructs an ordered or semi-ordered porous structure, which improves the mass transfer and reaction efficiency of pollutants, while the mechanical properties of the material are maintained well; (3) Utilization of potential functions of solid waste materials: Effectively utilize the potential components in solid waste, and through reasonable design of the alkaline environment of the system and template agent environment, activate the oxidation-reduction potential of metal oxides in industrial solid waste, so that they form stable embedded active sites in the material structure, which have the functions of heavy metal adsorption and organic pollutant catalytic degradation; (4) Simple and adjustable process with strong adaptability: The raw materials are widely available, the preparation process is green and efficient, and it is suitable for the treatment of different types of pollutants and site remediation, which expands the application boundary of resource utilization. Attached Figure Description

[0019] Figure 1 This is a flowchart of the method for preparing the geopolymer cementitious material of the present invention; Detailed Implementation

[0020] This invention relates to a geopolymer cementitious material with adsorption-catalysis functions, prepared through the synergistic use of multiple solid wastes, achieving a deep integration of solid waste resource utilization and environmental purification. By using geopolymers (such as fly ash and slag) as the framework matrix, introducing catalytically active metal oxide solid wastes (such as steel slag and manganese slag), and utilizing alkaline solid wastes such as carbide slag and red mud to replace chemical activators, while simultaneously using template agents to regulate the pore structure, a novel mesoporous cementitious material with dual adsorption and catalysis functions is formed. This material can be widely applied in environmental remediation scenarios such as urban sludge, heavy metal-containing slag, and organic wastewater sediment, exhibiting good mechanical strength and stability, while simultaneously achieving efficient adsorption, solidification, and catalytic oxidation treatment of pollutants. Compared to traditional geopolymer materials, this invention achieves a dual breakthrough in resource utilization and functionality through the activation and utilization of functional components of raw materials and the orderly regulation of microstructure, expanding the application boundaries of solid waste resource utilization and significantly improving pollutant treatment efficiency, thus possessing significant environmental and engineering application value.

[0021] 1. Preparation of solid waste-based catalytic cementitious materials Based on the synergistic potential of resource utilization of various types of industrial solid waste, this invention constructs a geopolymer cementitious material with adsorption-catalysis function prepared by synergistic preparation of multiple solid wastes and its preparation method.

[0022] 1) Material selection and proportioning: (1) Geopolymer solid waste (30~50%): Select materials such as fly ash, slag, metakaolin, etc., which are rich in SiO2 and Al2O3. Under alkaline conditions, they can form a three-dimensional skeleton structure like NASH or CASH, which is the basis of mechanical strength.

[0023] (2) Solid waste with catalytic potential (20~30%): such as steel slag, manganese slag, red mud and other industrial by-products rich in Fe2O3 and MnO2, which have good redox activity, can trigger Fenton-like reactions in the water environment, catalytically degrade organic pollutants, and at the same time have the ability to adsorb and fix heavy metal ions.

[0024] (3) Alkaline solid waste (15~30%): such as carbide slag, desulfurization ash, red mud and other by-products rich in Ca(OH)2 and Na2CO3, can be used as a substitute for traditional alkaline activators (NaOH or water glass) in the system to increase pH and accelerate gel formation rate. This ratio is optimized based on the optimal element ratio range in the geopolymer reaction to improve structural density.

[0025] (4) Template agent (2~4%): such as Pluronic P123, F127 mixed or CTAB and other surfactants as structure directing agents (the template agent is also called structure directing agent here). Through self-assembly mechanism, it forms an ordered or semi-ordered mesoporous framework structure, increases the specific surface area and porosity of the material, increases the exposure of active sites of catalytic components such as Fe / Mn, and enhances the mass transfer rate and reaction efficiency of pollutants in the material.

[0026] CTAB (hexadecyltrimethylammonium bromide): CTAB is a cationic surfactant with good hydrophilicity and hydrophobicity. It is suitable for forming hexagonal mesoporous structures, which can improve the dispersibility and catalytic activity of metal oxides (such as Fe2O3 and MnO2). Forming ordered mesoporous structures (such as MCM-41 type) increases the specific surface area, which helps to enhance catalytic degradation performance and heavy metal adsorption capacity.

[0027] The combined use of F127 and P123: P123 is a nonionic triblock copolymer suitable for forming mesoporous structures with large pore sizes (2-10 nm). It provides a high specific surface area, making it suitable for materials requiring large pore volumes and enhancing catalytic and adsorption capabilities. F127 offers higher stability and larger pore volumes, making it suitable for high-strength, long-term stable catalytic materials. By mixing these two template agents in a 1:1 ratio, both large pore sizes and structural stability can be achieved, adapting to more diverse material needs. This forms a biporous material with both large pore volumes and high stability, suitable for environmental remediation materials with multifunctional reaction sites.

[0028] 2) Preparation process like Figure 1 As shown, this invention discloses a method for preparing a geopolymer cementitious material, comprising the following steps: Step 1, solid waste pretreatment: Dry and grind various types of solid waste (geopolymer solid waste, catalytic potential solid waste, alkaline solid waste) to ensure that the particle size is less than 75μm in order to improve the reactivity and dispersibility; Step 2, Calculation of water addition: The water-ash mass ratio is 30%-40% of the total dry weight of the added solid waste; Step 3, Preparation of alkaline activation solution: Add the total amount of water calculated in Step 2 to the alkaline activation solid waste powder ground in Step 1, stir for 10 minutes until completely dissolved to form a uniform alkaline activation solid waste solution; Step 4, Mixing solid waste and template agent: Mix geopolymer solid waste, catalytic potential solid waste and template agent according to the specified ratio to ensure uniform dispersion. The ratio of geopolymer solid waste is 30-50%, the ratio of catalytic potential solid waste is 20-30%, and the ratio of template agent is 2-4%. The percentages are the percentages of each component to the total mass of the mixed solid waste and template agent powder, thus obtaining mixed solid waste and template agent powder. Step 5, Mixing and stirring: Pour the alkaline activated solid waste solution from Step 3 into the mixed solid waste and template agent powder from Step 4, and stir with a mechanical stirrer for 10 minutes to ensure that the materials are evenly mixed; Step 6, Injection Molding: Inject the alkaline activated solid waste solution and the mixture of mixed solid waste and template agent powder (after uniform stirring in Step 5) into the mold for molding; Step 7, Preliminary curing and demolding: Perform preliminary curing for about 1 day in an environment with 90% humidity and 25℃, and demold after molding; if further enhancement of catalytic activity is required, calcination treatment at 400-500℃ for 1-2 hours can be performed to effectively remove the template agent and reduce damage to the material structure, followed by curing of the solidified body. Step 8, Post-curing: Continue curing the molded material in an environment of 90% humidity and 25°C for 28 days until it reaches the required strength and stability.

[0029] Explanation of Functional Principles: The strength formation and adsorption-catalysis functions in the material system of this invention are achieved synergistically through multiple solid waste reaction mechanisms: (1) Under the strong alkaline environment provided by alkaline solid waste, SiO2 and Al2O3 in geopolymer solid waste are activated and dissolved, and undergo polymerization and condensation reactions to generate chain or network Si–O–Al structures, thereby endowing the material with high mechanical properties and structural stability; Ca²⁺ in alkaline solid waste may have an auxiliary gel reaction with the silicon-aluminum source (such as the formation of calcium-silicon-aluminum hydrate), synergistically constructing a composite skeleton and improving microstructure stability, thereby enhancing the overall mechanical properties and durability of the material.

[0030] (2) Catalytic Potential: The metal oxides such as Fe2O3 and MnO2 in solid waste, under the high alkaline environment provided by alkaline solid waste and the stable immobilization effect of the geopolymer skeleton, can form stable active sites on the surface of the material pore wall. When pollutants enter the material pores and are adsorbed and enriched, these active sites can promote the reaction of dissolved oxygen in the water or oxidizing components in the system. They can participate in Fenton-like or redox reactions, continuously generating active substances with strong oxidizing power, thereby gradually oxidizing and decomposing organic pollutants such as methyl orange, phenol, and bisphenol A into small molecules or harmless products, effectively realizing the adsorption and reduction of heavy metal ions and the catalytic degradation of organic pollutants.

[0031] (3) In alkaline media, the template agent induces the formation of an ordered mesoporous structure inside the material by regulating interfacial tension and colloidal aggregation path, which greatly increases the specific surface area and pore volume of the material, and significantly enhances the mass transfer rate and reaction contact efficiency of pollutants; due to its high specific surface area and porous material framework, it can then capture Pb²⁺ and Cr in water through electrostatic adsorption, complexation and other mechanisms. 6 ⁺ and other heavy metal pollutants; 3) Utilization methods This material system can be used for the stabilization, solidification, and in-situ remediation of complex pollutants such as waste soil and sludge, heavy metal contaminated waste soil, urban sludge, organically contaminated sediment, and wastewater treatment residue. The material itself possesses a certain mechanical strength and can be used as a support substrate or structural filler, such as a co-solidification agent for waste soil / sludge, a porous adsorption-catalysis material, and a smart roadbed material. Thanks to its mesoporous structure and catalytic function, it can efficiently adsorb and catalytically degrade various pollutants, possessing the potential for application in various environmental governance and resource utilization scenarios, including municipal infrastructure construction, ecological restoration projects, and emergency pollution control. Compared to traditional geopolymer materials, this invention achieves a dual breakthrough in resource utilization and functionality by activating and utilizing the functional components of raw materials and orderly regulating the microstructure, expanding the application boundaries of solid waste resource utilization and significantly improving pollutant treatment efficiency, thus possessing significant environmental and engineering application value. Example

[0032] Performance testing metrics and methods: Compressive strength: 40×40×160 mm prism specimens were prepared according to the standard, and their compressive strength was tested by a press after 28 days of curing. Specific surface area: The specific surface area of ​​the cured structure was tested using an automatic specific surface area analyzer with nitrogen adsorption method. Freeze-thaw cycle strength retention rate: After the sample is subjected to 25 freeze-thaw cycles, its compressive strength is measured and compared with the original strength to calculate the retention rate; Heavy metal removal rate (ICP-MS): The material is immersed in a standard concentration heavy metal solution for 24 hours, filtered, and the residual concentration is measured to calculate the removal rate; Organic pollutant removal rate (UV-Vis spectroscopy): The sample is added to an organic pollutant solution (such as methyl orange, phenol, bisphenol A, etc.), and after the reaction, the supernatant is collected to measure the change of its maximum absorption peak, and the removal rate is calculated.

[0033] Example 1: Using slag as the geopolymer solid waste, steel slag and manganese slag as the catalytic solid waste, red mud and calcium carbide slag as the alkaline activating material, and CTAB as the template agent, the mass ratio is 40:15:15:20:7:3 (slag:steel slag:manganese slag:red mud:calcium carbide slag:CTAB). The mixture is prepared with a water-cement ratio of 0.4. First, all types of solid waste are ground into powder for later use. Then, the alkaline activating solid waste is dissolved in water and stirred for 10 minutes. The geopolymer solid waste, catalytic solid waste, and template agent powder are mixed. The stirred alkaline activating solid waste solution is poured into the mixed powder, mechanically stirred for 10 minutes, and then molded. After curing in an environment with 90% humidity and 25℃ for 1 day, it is demolded and cured for another 28 days.

[0034] Test results: Compressive strength: 18.5 MPa Heavy metal pollutant ion removal rate: 92% Organic pollutant removal rate: 80% Specific surface area: 140 m² / g Freeze-thaw cycle strength retention rate: 93% Example 2: Using slag as geopolymer solid waste, steel slag and manganese slag as catalytic solid waste, red mud and calcium carbide slag as alkaline activating materials, and P123 and F127 mixed as template agent, the mass ratio was adjusted to 35:20:20:15:7:3 (slag: steel slag: manganese slag: red mud: calcium carbide slag: P123 + F127), and prepared with a water-cement ratio of 0.4. First, all types of solid waste were ground into powder for later use. Then, the alkaline activating solid waste was dissolved in water and stirred for 10 minutes. The geopolymer solid waste, catalytic solid waste and template agent powder were mixed. The stirred alkaline activating solid waste solution was poured into the mixed powder, mechanically stirred for 10 minutes, and then molded. After curing in an environment with 90% humidity and 25°C for 1 day, it was demolded and continued to be cured for 28 days.

[0035] Add distilled water directly to make a slurry, mechanically stir for 10 minutes, then pour into a mold to form the slurry. Cure in an environment with 90% humidity and 25℃ for 1 day, then demold and continue curing for 28 days.

[0036] Test results: Compressive strength: 17.3 MPa Heavy metal pollutant ion removal rate: 90% Organic pollutant removal rate: 78% Specific surface area: 150 m² / g Freeze-thaw cycle strength retention rate: 91% Example 3: Using slag as a geopolymer solid waste, steel slag and manganese slag as catalytic solid waste, and red mud and carbide slag as alkaline activating materials, P123 and F127 were mixed in as template agents, and the ratio was further adjusted to 40:15:15:20:7:3 (slag: steel slag: manganese slag: red mud: carbide slag: P123 + F127 (1:1 compound)). Distilled water was directly added to make a slurry, and after mechanical stirring for 10 minutes, it was molded. After curing in an environment with 90% humidity and 25°C for 1 day, it was demolded and calcined at 500°C for 2 hours to enhance structural stability. Then, it was cured for another 28 days.

[0037] The test results show that: Compressive strength: 22.4 MPa Heavy metal pollutant ion removal rate: 92% Organic pollutant removal rate: 91% Specific surface area: 170 m² / g Freeze-thaw cycle strength retention rate: 88% The beneficial effects of this invention are: (1) Synergistic utilization of multiple solid waste resources: Through the combined action of geopolymer matrix, industrial solid waste activating components and template agent, multiple functions such as cementation, adsorption and catalysis are integrated, which improves the comprehensive performance of material environmental remediation; (2) Precise control of pore structure: The introduction of template agent constructs an ordered or semi-ordered porous structure, which improves the mass transfer and reaction efficiency of pollutants, while the mechanical properties of the material are maintained well; (3) Utilization of potential functions of solid waste materials: Effectively utilize the potential components in solid waste, and through reasonable design of the alkaline environment of the system and template agent environment, activate the oxidation-reduction potential of metal oxides in industrial solid waste, so that they form stable embedded active sites in the material structure, which have the functions of heavy metal adsorption and organic pollutant catalytic degradation; (4) Simple and adjustable process with strong adaptability: The raw materials are widely available, the preparation process is green and efficient, and it is suitable for the treatment of different types of pollutants and site remediation, which expands the application boundary of resource utilization.

[0038] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A geopolymer cementitious material with adsorption-catalysis function prepared by synergistic preparation of multiple solid wastes, characterized in that, Composed of materials with the following corresponding mass fractions: Geopolymer solid waste 30-50% Catalytic potential of solid waste is 20-30%. Alkaline solid waste 15-30% Template agent 2-4%.

2. The geopolymer cementitious material according to claim 1, characterized in that, The geopolymer solid waste is selected from at least one of fly ash, slag, and metakaolin; or the geopolymer solid waste is a mixture of fly ash and slag, a mixture of fly ash and metakaolin, a mixture of slag and metakaolin, or a mixture of fly ash, slag, and metakaolin.

3. The geopolymer cementitious material according to claim 1, characterized in that, The catalytic potential solid waste is selected from at least one of steel slag, manganese slag, and red mud; or the catalytic potential solid waste is a mixture of steel slag and manganese slag, steel slag and red mud, manganese slag and red mud, or a mixture of steel slag, manganese slag, and red mud.

4. The geopolymer cementitious material according to claim 1, characterized in that, The alkaline solid waste is selected from at least one of carbide slag, desulfurization ash, and red mud; or the alkaline solid waste is a mixture of carbide slag and desulfurization ash, carbide slag and red mud, desulfurization ash and red mud, or a mixture of carbide slag, desulfurization ash, and red mud.

5. The geopolymer cementitious material according to claim 1, characterized in that, The template agent is a mixture of Pluronic P123 and F127, or CTAB, which forms an ordered or semi-ordered mesoporous framework structure through a self-assembly mechanism.

6. The geopolymer cementitious material according to claim 5, characterized in that, The Pluronic P123 and the F127 are mixed at a mass ratio of 1:

1.

7. A method for preparing a geopolymer cementitious material, characterized in that, Includes the following steps: Step 1, solid waste pretreatment: Dry and grind geopolymer solid waste, catalytic potential solid waste, and alkaline solid waste to ensure that the particle size is less than 75μm; Step 2, Calculation of water addition: The water-ash mass ratio is 30%-40% of the total dry weight of the added solid waste; Step 3, Preparation of alkaline activation solution: Add the total amount of water calculated in Step 2 to the alkaline activation solid waste powder ground in Step 1, stir for a set time until it is completely dissolved to form a uniform alkaline activation solid waste solution; Step 4, Mixing solid waste and template agent: Mix geopolymer solid waste, catalytic potential solid waste and template agent according to the specified ratio to obtain mixed solid waste and template agent powder. The ratio of geopolymer solid waste is 30-50%, the ratio of catalytic potential solid waste is 20-30%, and the ratio of template agent is 2-4%. The percentages are the percentages of each component to the total mass of the mixed solid waste and template agent powder. Step 5, Mixing and stirring: Pour the alkaline activated solid waste solution from Step 3 into the mixed solid waste and template agent powder from Step 4, and stir with a mechanical stirrer for a set time to ensure that the materials are mixed evenly; Step 6, Injection Molding: The alkaline activated solid waste solution and the mixture of mixed solid waste and template agent powder, which were uniformly stirred in Step 5, are injected into the mold for molding.

8. The preparation method according to claim 7, characterized in that, The process after step 6 also includes: Step 7, Preliminary curing and demolding: Perform preliminary curing for a set time in an environment with 90% humidity and 25℃, and demold after molding; Step 8, Post-curing: Continue curing the molded material in an environment with 90% humidity and 25°C for a set time until it reaches the required strength and stability.

9. The preparation method according to claim 8, characterized in that, In step 3, the stirring time is 10 minutes; in step 7, the time is set to 1 day.

10. The preparation method according to claim 8, characterized in that, The process after step 7 also includes: Further steps to enhance catalytic activity: calcination at 400-500℃ for 1-2 hours; In step 8, the time period is set to 28 days.

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