A material film and a method for extracting humic acid from leachate

Abstract

The application relates to the field of water treatment, and particularly discloses a material membrane and a method for extracting humic acid in leachate. The material membrane comprises, by weight, 10-20 parts of polyvinyl alcohol, 5-10 parts of nano-aluminum oxide, 3-5 parts of mesoporous molecular sieve, 1-3 parts of glycerol and 80-100 parts of deionized water; the preparation method comprises the following steps: uniformly mixing the polyvinyl alcohol, the nano-aluminum oxide, the mesoporous molecular sieve, polyethylene glycol diacrylate and the glycerol, adding the deionized water, stirring and dissolving under the condition of temperature rising to 75-80 DEG C to obtain a mixed solution, pouring the mixed solution into a plane mold, drying and forming the plane mold under the condition of temperature of 50-60 DEG C, and keeping warm for 10-14 hours to obtain the material membrane. The material membrane is used for extracting humic acid in leachate, and has the advantages of reducing the content of humic acid in the leachate.

Description

[0001] Method Domain This application relates to the field of water treatment, and more specifically, to a material membrane and a method for extracting humic acid from leachate.

[0002] Background and Methodology: With rapid industrialization and urbanization, wastewater discharge has been increasing, causing serious environmental impacts. Wastewater treatment has become a significant environmental issue, attracting widespread attention. Leachate, a special type of wastewater in wastewater treatment, is characterized by high concentration and high pollution levels, making its treatment challenging and a current research hotspot.

[0003] Leachate mainly refers to wastewater generated from landfills. Its composition is complex, containing large amounts of organic matter, heavy metals, ammonia nitrogen, and other harmful substances. Humic acid is one of the main organic compounds in leachate. During landfilling, plant residues and decaying organic matter in the waste undergo microbial decomposition, producing humic acid in the leachate. Its content increases significantly with the duration of landfilling. Humic acid exists in leachate in colloidal form and has the ability to adsorb metal ions and other pollutants.

[0004] However, when the humic acid content in the leachate is high, it is difficult to degrade and will significantly inhibit the hydrolysis of complex organic matter such as proteins, lipids, and cellulose, affecting subsequent leachate reinjection and volume reduction treatment, thereby reducing the treatment effect of the leachate. Summary of the Invention

[0005] To reduce the humic acid content in leachate, this application provides a material membrane and a method for extracting humic acid from leachate.

[0006] Firstly, the material membrane provided in this application adopts the following solution: A material membrane, by weight, comprises 10-20 parts polyvinyl alcohol, 5-10 parts nano-alumina, 3-5 parts mesoporous molecular sieve, 1-3 parts glycerol, and 80-100 parts deionized water.

[0007] By adopting the above technical solutions, polyvinyl alcohol, as the membrane substrate, provides the basic structure and mechanical strength of the membrane, ensuring the stability and continuity of the membrane during leachate treatment, thereby guaranteeing the separation effect of humic acid. The addition of nano-alumina improves the microstructure of the membrane, increasing its specific surface area and providing more active adsorption sites. This enhances the membrane's adsorption and separation capacity for humic acid, enabling more effective separation of humic acid molecules from the leachate. Mesoporous molecular sieves form a structural support in the membrane matrix, enhancing the membrane's mechanical strength, tear resistance, and chemical corrosion resistance. Furthermore, as a material with regular pore sizes, mesoporous molecular sieves improve the membrane's separation efficiency for humic acid. By adjusting the proportion of deionized water, the membrane porosity can be controlled, giving the membrane better permeability and ensuring that the leachate can smoothly pass through the membrane and separate from the humic acid, reducing the humic acid content in the leachate.

[0008] Glycerol is compatible with PVA in solution and plays a pore-forming role in membrane formation. The addition of glycerol molecules can affect the viscosity and surface tension of the PVA solution, promoting the formation of the membrane's pore structure. One of the advantages of using glycerol as a pore-forming agent is its biodegradability and non-toxicity.

[0009] Optionally, the mesoporous molecular sieve used is SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm.

[0010] By employing the above technical solution, SBA-15 mesoporous molecular sieve possesses a highly ordered pore structure and adjustable pore size, enabling it to selectively adsorb target substances such as humic acid through surface interactions. Due to its large specific surface area and porous structure, SBA-15 mesoporous molecular sieve can provide a large adsorption capacity, thereby effectively adsorbing and removing humic acid from leachate.

[0011] Optionally, the pore size of the material membrane is 0.1-0.5μm, and the thickness of the material membrane is 0.1-0.3mm.

[0012] By adopting the above technical solution, humic acid can be retained, preventing it from passing through the pores of the material membrane and thus improving the purity and extraction efficiency of humic acid.

[0013] Optionally, the viscosity of the polyvinyl alcohol is 600-800 mPa·s.

[0014] By employing the above technical solutions, high-viscosity polyvinyl alcohol (PVA) provides better film-forming properties, making the membrane more robust and durable. This viscosity of PVA effectively binds other components together, forming a tightly structured membrane with high mechanical strength. Adjusting the viscosity helps PVA form a uniform pore structure during preparation, allowing the leachate to pass through the membrane more smoothly, reducing resistance and improving treatment efficiency. By controlling the viscosity of PVA, the pore size and distribution of the membrane can be affected, further regulating the membrane's adsorption and separation performance, contributing to the formation of a uniform pore structure, and improving the membrane's selectivity and separation effect.

[0015] Optionally, it may also include 4-8 parts by weight of polyethylene glycol diacrylate.

[0016] By employing the above technical solution, polyethylene glycol diacrylate, possessing double bonds, undergoes a cross-linking reaction within the membrane, enhancing its overall structure and stability. The addition of polyethylene glycol diacrylate may further enhance the membrane's adsorption capacity for humic acid. This may be achieved by interacting with the polar functional groups in humic acid, thereby improving the membrane's adsorption selectivity and efficiency for humic acid.

[0017] Secondly, the method for preparing a material membrane provided in this application adopts the following scheme: A method for preparing a material membrane: Polyvinyl alcohol, nano-alumina, mesoporous molecular sieve, polyethylene glycol diacrylate and glycerol are mixed evenly, deionized water is added, the mixture is heated to 75-80℃ and stirred to dissolve, a mixture is obtained, the mixture is poured into a flat mold, the flat mold is dried and shaped at 50-60℃, and kept at the temperature for 10-14 hours to obtain the material membrane.

[0018] Optionally, polyethylene glycol diacrylate is also added to the mixture, and the mixture is irradiated with ultraviolet light in the 320-400nm band for 3-5 minutes while being dried.

[0019] By employing the above technical solution, placing the film under ultraviolet light in the 320-400nm wavelength band for 3-5 minutes can induce cross-linking of polyethylene glycol diacrylate. The cross-linked polyethylene glycol diacrylate forms a network structure, which helps improve the chemical stability and durability of the film, allowing it to maintain good performance during long-term use.

[0020] Optionally, after the material film is prepared, it needs to be irradiated with a high-energy electron beam of 80-120 A / m2 for 20-40 seconds in an irradiation device, and the accelerating voltage of the high-energy electron beam is 5-15 kV.

[0021] By employing the above-mentioned technical solution, high-energy electron beam irradiation can induce chemical reactions and structural changes on the surface of the material film, leading to the formation or increase of surface active sites. These active sites can interact with humic acid molecules, enhancing the adsorption selectivity and efficiency of the material film for humic acid.

[0022] Secondly, this application provides a method for extracting humic acid from leachate using a membrane material, employing the following technical solution: A method for extracting humic acid from leachate using a membrane material includes the following steps: The leachate is pressurized to 3-5 kPa and passed through a material membrane for percolation. Humic acid colloids are trapped on one side of the material membrane, thus achieving the extraction of humic acid from the leachate by the material membrane.

[0023] By employing the above technical solution, the permeation rate can be adjusted by pressurizing the leachate through the material membrane. Appropriate pressure increases the resistance of the leachate to the material membrane, thereby controlling the permeation rate of the humic acid colloid and achieving selective extraction of humic acid from the leachate.

[0024] In summary, this application has the following beneficial effects: 1. This application uses a mixture of polyvinyl alcohol, nano-alumina, mesoporous molecular sieve, glycerol, and deionized water in a specific ratio to prepare the membrane, which exhibits excellent mechanical strength, permeability, and resistance to humic acid corrosion. Nano-alumina increases the specific surface area, providing more active sites and enhancing the adsorption and separation capacity of humic acid. The mesoporous molecular sieve enhances mechanical strength and corrosion resistance, and improves separation efficiency. Adjusting the deionized water ratio controls the membrane porosity, ensuring smooth passage of the leachate. The membrane prepared by this method is suitable for treating humic acid in leachate.

[0025] 2. In this application, a preferred method is to initiate a cross-linking reaction of polyethylene glycol diacrylate to form a network structure, thereby improving the chemical stability and durability of the membrane. Irradiation of the membrane using a high-energy electron beam in an irradiation device induces surface chemical reactions and structural changes, enhancing the membrane's adsorption selectivity and efficiency for humic acids.

[0026] 3. The method of this application can increase the resistance of the leachate on the material membrane by pressurizing the leachate by 3-5 kPa, thereby controlling the permeation rate of humic acid colloid. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments. Example

[0028] Example 1 A method for extracting humic acid from leachate using a membrane material: 1. Preparation of the material membrane: 10 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 5 kg of nano alumina, 3 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm and 1 kg of glycerol were mixed evenly, 80 kg of deionized water was added, and the mixture was heated to 78℃±2℃ and stirred to dissolve, thus obtaining a mixture. The mixture was poured into a flat mold, and the flat mold was dried and shaped at 55℃ and kept at the temperature for 12 h to obtain a material membrane with a pore size distribution of 0.1-0.5 μm. 2. Membrane filtration of leachate: The membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The membrane is fixed in a filter tank with a radius of 45cm using sealant. The membrane and the filter tank are parallel to each other along the circumference. The membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the membrane. Under a gas pressure of 4kPa, the leachate permeates through the membrane, and the humic acid colloid is trapped on one side of the membrane, thus separating the humic acid in the leachate.

[0029] Example 2 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of material membrane: 20 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 10 kg of nano alumina, 5 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm and 3 kg of glycerol were mixed evenly, 100 kg of deionized water was added, and the mixture was heated to 78℃±2℃ and stirred to dissolve, and a mixture was obtained. The mixture was poured into a flat mold, and the flat mold was dried at 55℃ and kept warm for 12 h to obtain a material membrane with a pore size distribution of 0.1-0.5 μm. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0030] Example 3 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of material membrane: 15 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 8 kg of nano alumina, 4 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm and 2 kg of glycerol were mixed evenly, 90 kg of deionized water was added, and the mixture was heated to 78℃±2℃ and stirred to dissolve, and a mixture was obtained. The mixture was poured into a flat mold, and the flat mold was dried at 55℃ and kept warm for 12 h to obtain a material membrane with a pore size distribution of 0.1-0.5 μm. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0031] Example 4 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of material membrane: 15 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 8 kg of nano alumina, 4 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm, 6 kg of polyethylene glycol diacrylate and 2 kg of glycerol were mixed evenly, 90 kg of deionized water was added, and the mixture was heated to 78℃±2℃ and stirred to dissolve, and a mixture was obtained. The mixture was poured into a flat mold, and the flat mold was dried at 55℃ and kept warm for 12 h. While the mixture was being dried, it was placed under ultraviolet light in the 380 nm band for 4 min. After the heat preservation was completed, a material membrane with a pore size distribution of 0.1-0.5 μm was obtained. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0032] Example 5 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of the material membrane: 15 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 8 kg of nano-alumina, 4 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm, 6 kg of polyethylene glycol diacrylate and 2 kg of glycerol were mixed evenly, and 90 kg of deionized water was added. The mixture was heated to 78℃±2℃ and stirred to dissolve, resulting in a mixed solution. The mixed solution was poured into a flat mold, and the flat mold was dried and shaped at 55℃ and kept at that temperature for 12 h. While the mixed solution was being dried, it was placed under ultraviolet light in the 380 nm band for 4 min to obtain a material membrane with a pore size distribution of 0.1-0.5 μm. The material membrane was then subjected to irradiation at 100 A / m in an irradiation device. 2 The high-energy electron beam irradiated the object for 30 seconds, and the accelerating voltage of the high-energy electron beam was 10kV. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0033] Example 6 A method for extracting humic acid from leachate using a material membrane differs from Example 5 in that: MCM-41 mesoporous molecular sieve is used for mesoporous molecular sieving.

[0034] Example 7 A method for extracting humic acid from leachate using a material membrane differs from Example 5 in that the material membrane thickness is 0.4 mm.

[0035] Example 8 A method for extracting humic acid from leachate using a material membrane differs from Example 5 in that the polyvinyl alcohol viscosity is 500 mPa·s.

[0036] Example 9 A method for extracting humic acid from leachate using a material membrane differs from Example 5 in that the polyvinyl alcohol viscosity is 900 mPa·s.

[0037] Comparative Example Comparative Example 1 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of material film: 15 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 8 kg of nano alumina, 6 kg of polyethylene glycol diacrylate and 2 kg of glycerol were mixed evenly, 90 kg of deionized water was added, and the mixture was heated to 78℃±2℃ and stirred to dissolve, and a mixture was obtained. The mixture was poured into a flat mold, and the flat mold was dried at 55℃ and kept warm for 12 h. While the mixture was being dried, it was placed under ultraviolet light in the 380nm band for 4 min to obtain a material film with a pore size distribution of 0.1-0.5 μm. The material film was irradiated in an irradiation device with a high-energy electron beam of 100 A / m2 for 30 s. The accelerating voltage of the high-energy electron beam was 10 kV. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0038] Comparative Example 2 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of the material membrane: 15 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 4 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm, 6 kg of polyethylene glycol diacrylate and 2 kg of glycerol were mixed evenly, and 90 kg of deionized water was added. The mixture was heated to 78℃±2℃ and stirred to dissolve, resulting in a mixture. The mixture was poured into a flat mold and dried at 55℃ for 12 h. While the mixture was being dried, it was placed under ultraviolet light in the 380 nm band for 4 min to obtain a material membrane with a pore size distribution of 0.1-0.5 μm. The material membrane was then subjected to irradiation at 100 A / m in an irradiation device. 2 The high-energy electron beam irradiated the object for 30 seconds, and the accelerating voltage of the high-energy electron beam was 10kV. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0039] Comparative Example 3 A method for extracting humic acid from leachate using a membrane material: (1) Preparation of the material membrane: 15 kg of polyvinyl alcohol with a viscosity of 700 mPa·s, 8 kg of nano-alumina, 4 kg of SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm, 6 kg of polyethylene glycol diacrylate and 2 kg of glycerol were mixed evenly, and 90 kg of deionized water was added. The mixture was heated to 78℃±2℃ and stirred to dissolve, and the mixture was poured into a flat mold. The flat mold was dried and shaped at 55℃ and kept at the temperature for 12 h to obtain a material membrane with a pore size distribution of 0.1-0.5 μm. The material membrane was then subjected to irradiation at 100 A / m 2 The high-energy electron beam irradiated the object for 30 seconds, and the accelerating voltage of the high-energy electron beam was 10kV. (2) Material membrane filtration of leachate: The material membrane is cut into a circle with a radius of 50cm and a thickness of 0.2mm. The material membrane is fixed in a filter tank with a radius of 45cm with sealant. The material membrane and the filter tank are parallel to each other along the circumference. The material membrane divides the space inside the filter tank into two parts. The leachate is injected into the filter tank. The side of the filter tank into which the leachate is injected is pressurized by an air pump, which causes the leachate to move towards the material membrane. Under a pressure of 4kPa, the leachate permeates through the material membrane, and the humic acid colloid is trapped on one side of the material membrane, thus separating the humic acid in the leachate.

[0040] Performance testing Detection methods The methods for extracting humic acid from leachate using the material membranes of Examples 1-9 and Comparative Examples 1-3 were used to filter leachate with a humic acid content of 300 mg / L, and the concentration of humic acid in the filtered leachate was measured to calculate the extraction rate.

[0041] The tear strength of the films prepared in Examples 1-9 and Comparative Examples 1-3 was tested using the SLD-1000Z tear strength tester according to the Elmendorf method of ISO 6383 / 2 Determination of tear resistance of plastic films and sheets - Part 2: Elmendorf method.

[0042] The pure water flux of the ultrafiltration membranes in Examples 1-9 and Comparative Examples 1-3 was tested at a pressure of 0.1 MPa.

[0043] Table 1 Test Data Statistics As can be seen from Example 5 and Comparative Example 1, and in conjunction with Table 1, the addition of molecular sieves can enhance the physical strength of the membrane, making it less susceptible to damage from external forces, thereby increasing its service life. The addition of mesoporous molecular sieves to the material membrane helps improve membrane permeability and reduce filtration resistance, making the membrane more efficient in treating leachate.

[0044] As can be seen from Example 5 and Comparative Example 2, and Table 1, the addition of nano-alumina to the material membrane can improve the tear strength and enhance the adsorption and separation capacity of the material membrane for humic acid, thus enabling more effective separation of humic acid molecules from the leachate.

[0045] As can be seen from Example 4 and Comparative Example 3, and in conjunction with Table 1, ultraviolet light irradiation can promote cross-linking reactions between polymer molecules, forming a more complex network structure. Cross-linking reactions help improve the physical strength of the membrane. Through cross-linking, polymer molecules form tighter bonds, thereby improving the overall performance of the membrane.

[0046] As can be seen from Examples 1-3 and Table 1, by adjusting the raw material ratio of the material membrane, the strength of the material membrane and the effect of extracting humic acid can be further improved. Among them, the component ratio of the material membrane in Example 3 is the optimal one in this application.

[0047] As can be seen from Examples 3 and 5 and Table 1, high-energy electron beam irradiation can induce surface activation of the material film, thereby enhancing the adsorption selectivity and efficiency of the material film for humic acid.

[0048] As can be seen from Examples 5-9 and Table 1, the SBA-15 mesoporous molecular sieve used for mesoporous molecular sieving can achieve a good effect in extracting humic acid. Considering the economy and humic acid extraction capacity, the optimal material membrane thickness is set at 0.1-0.3 mm. A thickness exceeding 0.3 mm does not significantly improve the humic acid extraction effect. The optimal polyvinyl alcohol viscosity is 600-800 mPa·s.

[0049] As can be seen from Examples 3 and 4 and Table 1, the strength of the membrane and the humic acid extraction rate were improved after adding polyethylene glycol diacrylate and cross-linking. This indicates that polyethylene glycol diacrylate undergoes a cross-linking reaction in the membrane, enhancing its overall structure and stability. The addition of polyethylene glycol diacrylate may further enhance the membrane's adsorption capacity for humic acid.

[0050] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A material film, characterized by, By weight, it includes 10-20 parts of polyvinyl alcohol, 5-10 parts of nano alumina, 3-5 parts of mesoporous molecular sieve, 1-3 parts of glycerol, 80-100 parts of deionized water and 4-8 parts of polyethylene glycol diacrylate. The preparation method of the material membrane includes: mixing polyvinyl alcohol, nano alumina, mesoporous molecular sieve and glycerol evenly, adding deionized water, heating to 75-80℃ and stirring to dissolve, obtaining a mixture, adding polyethylene glycol diacrylate to the mixture, pouring the mixture into a flat mold, drying the flat mold at 50-60℃ and keeping it at that temperature for 10-14 hours to obtain the material membrane; During the drying of the flat mold, it is irradiated with ultraviolet light in the 320-400nm band for 3-5 minutes. After the material film is prepared, it is subjected to high-energy electron beam irradiation treatment. The irradiation conditions are: 80-120 A / m², accelerating voltage 5-15 kV, and irradiation time 20-40 s.

2. The material membrane according to claim 1, characterized in that: The mesoporous molecular sieve used is SBA-15 mesoporous molecular sieve with a particle size of 10-50 μm.

3. The material membrane according to claim 1, characterized in that: The material membrane has a pore size of 0.1-0.5μm and a thickness of 0.1-0.3mm.

4. The material membrane according to claim 1, characterized in that: The viscosity of the polyvinyl alcohol is 600-800 mPa·s.

5. A method for extracting humic acid from leachate using a membrane material according to any one of claims 1-4, characterized in that: The process includes the following steps: The leachate is pressurized to 3-5 kPa and passed through a material membrane for percolation. Humic acid colloids are trapped on one side of the material membrane, thus enabling the material membrane to extract humic acid from the leachate.

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