Preparation process of slow-release underground water organic pollution degradation purifying agent
By coating the surface of activated carbon and persulfate core particles with sepiolite powder, cobalt salt and iron salt to form a catalytic powder and then applying it to a styrene-butadiene-styrene block copolymer emulsion, the problems of low persulfate utilization efficiency and catalyst loss were solved, and long-term degradation of organic pollutants in groundwater was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO HARBIN INSTITUTE OF TECHNOLOGY (WEIHAI)
- Filing Date
- 2026-02-05
- Publication Date
- 2026-05-15
AI Technical Summary
Existing persulfate advanced oxidation technology suffers from low persulfate utilization efficiency and easy catalyst loss when treating organic pollution in groundwater, resulting in unstable purification effects and the need for frequent replenishment.
An active catalytic powder made from sepiolite powder, cobalt salt, and iron salt is coated with a styrene-butadiene-styrene block copolymer emulsion onto the surface of activated carbon and persulfate core particles to form a slow-release film. The fiber bundle structure of sepiolite enhances the contact between the catalyst and persulfate, forming a slow-release channel and prolonging the purification effect.
It improves the utilization rate of persulfate, extends the service life of the purifying agent, maintains a long-lasting degradation effect on organic pollutants, and prevents catalyst loss.
Smart Images
Figure CN122036047A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water treatment technology, specifically to a preparation process for a slow-release groundwater organic pollutant degradation and purification agent. Background Technology
[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.
[0003] Groundwater serves as a vital source of drinking water and ecological replenishment in many regions, and its quality is crucial to human health and ecosystem stability. However, with rapid industrialization, urbanization, and intensive agriculture, organic pollution has become a global environmental problem threatening groundwater quality. Groundwater organic pollution refers to the process by which organic compounds of anthropogenic or natural origin enter aquifers through infiltration, leakage, runoff, or injection, leading to adverse changes in their chemical properties. This type of pollution is characterized by its insidious nature, delayed effects, irreversibility, and high remediation costs. The most direct consequence of pollution is the loss of drinking water source function, harming human health through drinking water, skin contact, or inhalation of vapors. Simultaneously, pollution disrupts the balance of groundwater ecosystems, impacting the ecological health of rivers and wetlands that depend on groundwater. Therefore, purifying organically polluted groundwater is an essential part of its management.
[0004] Persulfate-based advanced oxidation processes (PS-AOPs) are a highly efficient water treatment technology primarily used to degrade organic pollutants that are difficult to treat biologically. The core of this technology involves catalytically activating persulfates (such as permonosulfate PMS or perdisulfate PDS) to generate sulfate radicals (SO4). - The process utilizes strong oxidizing agents such as hydroxyl radicals (·OH) to rapidly decompose pollutants. However, current PS-AOPs primarily involve adding persulfate and catalyst directly to the water body. Because persulfate is readily consumed by reducing substances in the water, the purification effect is short-lived, requiring frequent replenishment to maintain effectiveness. This not only results in low persulfate utilization efficiency but also leads to catalyst loss. Furthermore, the limited contact between persulfate and catalyst in this method also affects the degradation efficiency. Summary of the Invention
[0005] This invention provides a preparation process for a slow-release groundwater organic pollutant degradation and purification agent. This process not only allows for more complete contact between sulfate and catalyst but also effectively alleviates the problems of rapid consumption and low utilization rate of persulfate, thus improving the degradation effect on organic pollutants while maintaining a good purification effect for a longer period. Specifically, the technical solution of this invention is as follows.
[0006] A preparation process for a slow-release groundwater organic pollutant degradation and purification agent includes the following steps: (1) Add sepiolite powder, cobalt salt and iron salt to water and mix well. Then heat the mixture and adjust it to alkaline under stirring. After completion, separate the solid, wash and dry it, and then calcine it to obtain active catalyst powder for later use.
[0007] (2) The activated carbon was mixed with a saturated persulfate solution and then freeze-dried. The mixture was then ground to obtain modified activated carbon powder. The modified activated carbon powder was granulated and dried to obtain core particles.
[0008] (3) The styrene-butadiene-styrene block copolymer emulsion is mixed with the active catalyst powder to obtain a slow-release membrane liquid. Then the slow-release membrane liquid is coated onto the surface of the core particles. After drying, it is placed in anhydrous ethanol and stirred. After completion, the particles are separated and dried to obtain the degradation and purification agent.
[0009] Further, in step (1), the mass ratio of the sepiolite powder to the total of cobalt salt and iron salt is 1:0.3~0.36. Optionally, the fineness of the sepiolite powder is 60~120 mesh.
[0010] Further, in step (1), the Co provided by the cobalt salt 2+ Fe provided by iron salts 3+ The molar ratio is 2:1.
[0011] Further, in step (1), the cobalt salt includes at least one of cobalt chloride (CoCl2), cobalt nitrate (Co(NO3)2), and cobalt sulfate (CoSO4).
[0012] Further, in step (1), the iron source includes at least one of ferric chloride (FeCl3), ferric nitrate (Fe(NO3)3), ferric sulfate (Fe2(SO4)3), etc.
[0013] Furthermore, in step (1), the heating temperature is 60~80℃.
[0014] Further, in step (1), the mixture is adjusted to be alkaline by adding at least one of the alkaline solutions such as sodium hydroxide, potassium hydroxide, and ammonia. Optionally, the pH of the alkaline solution is 10-12.
[0015] Furthermore, in step (1), the calcination treatment is carried out at a temperature of 700~750℃ for 2~4 hours.
[0016] Further, in step (2), the solid-liquid ratio of the activated carbon to the saturated persulfate solution is 1g:10~14.5mL. Optionally, the persulfate includes at least one of permonosulfate, perdisulfate, etc.
[0017] Furthermore, in step (2), the modified activated carbon powder has a fineness of not less than 150 mesh. The core particles have a particle size of 2~5 mm.
[0018] Further, in step (3), the mass ratio of the styrene-butadiene-styrene block copolymer emulsion to the active catalyst powder is 1:0.27~0.34.
[0019] Furthermore, in step (3), the thickness of the coating film formed on the surface of the degradation and purification agent is 0.8~1.5mm.
[0020] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: This invention first forms a mixture of sepiolite powder, cobalt salt, and iron salt, thereby allowing the sepiolite to absorb a large number of cobalt and iron ions. Then, the cobalt and iron ions are converted into hydroxides and calcined to form a cobalt ferrite (CoFe2O4) spinel catalyst, which is then loaded onto the sepiolite. Simultaneously, magnesium from the sepiolite dissolves into the spinel lattice, inducing electron polarization on the catalyst surface and generating electron-rich active cobalt centers, thus enhancing catalytic degradation performance. Furthermore, this invention uses the activated catalytic powder obtained through the above treatment to form a slow-release film with a styrene-butadiene-styrene block copolymer emulsion, which is then coated onto the surface of core particles formed by activated carbon and persulfate to form a flexible, slow-release coating layer with catalytic properties, thus forming the purification agent of this invention. When this purifier is used to treat organic pollutants in groundwater, on the one hand, the active catalytic powder in the coating layer absorbs water and expands to form a slow-release channel. External moisture enters the core particles through this channel, where the persulfate gradually dissolves and is then slowly released outward through the channel. Simultaneously, as the persulfate passes through the channel, it comes into contact with the cobalt ferrite (CoFe2O4) spinel catalyst in the sepiolite, and is subsequently converted into sulfate radicals (SO42-) under its catalysis. -Strong oxidizing substances such as · and hydroxyl radicals (·OH) are released into the external water body, oxidizing and degrading the organic matter therein, thus purifying the water quality. During this process, the interception, turbulence, and thickening effects of the fiber bundles in sepiolite allow persulfate to come into more complete contact with CoFe2O4 within the fiber bundles. This not only allows for a more complete conversion of persulfate into strong oxidizing substances, improving the utilization rate of persulfate, but also, due to the microstructure of sepiolite as fine fiber bundles, the CoFe2O4 is constrained between the fiber bundles after formation. Furthermore, the thickening effect of sepiolite after absorbing water effectively prevents the CoFe2O4 from detaching and being lost during the use of the water purification agent. Attached Figure Description
[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention and do not constitute an undue limitation of the invention.
[0022] Figure 1 The image shows a sample of the catalyst prepared in Example 1 below.
[0023] Figure 2 The graph shows the degradation rate test results for Example 1 below.
[0024] Figure 3 The image shows a sample of the catalyst prepared in Example 2 below.
[0025] Figure 4 The following graph shows the degradation rate test results for Example 2.
[0026] Figure 5 The image shows a sample of the catalyst prepared in Example 3 below.
[0027] Figure 6 The graph shows the degradation rate test results for Example 3 below.
[0028] Figure 7 The image shows a sample of the catalyst prepared in Example 4 below.
[0029] Figure 8 The graph shows the degradation rate test results for Example 4 below.
[0030] Figure 9 The image shows a sample of the catalyst prepared in Example 5 below.
[0031] Figure 10 The graph shows the degradation rate test results for Example 5 below.
[0032] Figure 11 The graph shows the degradation rate test results for Example 6 below.
[0033] Figure 12 The graph shows the degradation rate test results for Example 7 below. Detailed Implementation
[0034] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.
[0035] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. The reagents or raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods or product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of this invention. The technical solution of this invention will now be further described in conjunction with the accompanying drawings and specific embodiments.
[0036] Example 1: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Add sepiolite powder (80 mesh), cobalt salt (Co(NO3)2), and iron salt (Fe(NO3)3) to water and stir until homogeneous to form a mixture, wherein the mass ratio of sepiolite powder to the total mass of cobalt salt and iron salt is 1:0.32. 2+ Fe 3+ The molar ratio was 2:1. The mixture was then heated to 60°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 12. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 740°C at a heating rate of 10°C / min and held for 2.5 hours. The mixture was then cooled to room temperature to obtain the active catalyst powder for later use.
[0037] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1 g: 13 mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 150-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10 wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0038] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.3 and stirred evenly. Then, the slow-release film liquid is sprayed onto the core particles to form a coating film and dried to obtain a degradation and purification agent with a coating film thickness of about 1.1 mm (e.g., Figure 1 (As shown).
[0039] Performance Testing: The degradation and purification agent prepared in this embodiment was added to a groundwater simulation solution with a diuron concentration of 2 mg / L at a dosage of 3 g / L. The degradation rate was then calculated after 8 hours. The degradation and purification agent was then removed and reused in a new groundwater simulation solution, and the degradation rate was calculated again after 8 hours. This method was repeated 10 times consecutively, and the degradation rates for each of the 10 iterations were obtained. The results are as follows: Figure 2 As shown, the degradation and purification agent in this embodiment can maintain a good purification effect for a long time.
[0040] Example 2: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Add sepiolite powder (60 mesh), cobalt salt (CoCl2), and iron salt (FeCl3) to water and stir until homogeneous to form a mixture, wherein the mass ratio of sepiolite powder to the total mass of cobalt salt and iron salt is 1:0.36. 2+ Fe 3+ The molar ratio was 2:1. The mixture was then heated to 70°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 10. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 750°C at a heating rate of 10°C / min and held for 2 hours. Finally, it was cooled to room temperature to obtain the active catalyst powder for later use.
[0041] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1g:14.5mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 200-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0042] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.27 and stirred evenly. Then, the slow-release membrane liquid is sprayed onto the core particles and dried to obtain a degradation and purification agent with a coating thickness of about 0.8 mm (e.g., Figure 3 (As shown).
[0043] Performance testing: The degradation rate of the groundwater simulation solution prepared in this embodiment was tested each time during 10 consecutive reuses of the degradation and purification agent using the same method as in Example 1 above. The results are as follows: Figure 4 As shown in the figure, the degradation and purification agent in this embodiment can maintain a good purification effect for a long time.
[0044] Example 3: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Add sepiolite powder (120 mesh), cobalt salt (CoSO4), and iron salt (Fe2(SO4)3) to water and stir until homogeneous to form a mixture, wherein the mass ratio of sepiolite powder to the total mass of cobalt salt and iron salt is 1:0.3. 2+ Fe 3+ The molar ratio was 2:1. The mixture was then heated to 80°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 11. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 700°C at a heating rate of 10°C / min and held for 4 hours. Finally, it was cooled to room temperature to obtain the active catalyst powder for later use.
[0045] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1 g: 10 mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 250-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10 wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0046] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.34 and stirred evenly. Then, the slow-release membrane liquid is sprayed onto the core particles and dried to obtain a degradation and purification agent with a coating thickness of about 1.5 mm (e.g., Figure 5 (As shown).
[0047] Performance testing: The degradation rate of the groundwater simulation solution prepared in this embodiment was tested each time during 10 consecutive reuses of the degradation and purification agent using the same method as in Example 1 above. The results are as follows: Figure 6 As shown in the figure, the degradation and purification agent in this embodiment can maintain a good purification effect for a long time.
[0048] Example 4: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Wood flour with a fineness of 80 mesh, cobalt salt (Co(NO3)2), and iron salt (Fe(NO3)3) are added to water and stirred evenly to form a mixture, wherein the mass ratio of sepiolite powder to the total mass of cobalt salt and iron salt is 1:0.32. 2+ Fe 3+The molar ratio was 2:1. The mixture was then heated to 60°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 12. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 740°C at a heating rate of 10°C / min and held for 2.5 hours. The mixture was then cooled to room temperature to obtain the active catalyst powder for later use.
[0049] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1 g: 13 mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 150-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10 wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0050] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.3 and stirred evenly. Then, the slow-release membrane liquid is sprayed onto the core particles and dried to obtain a degradation and purification agent with a coating thickness of about 1.1 mm (e.g., Figure 7 (As shown).
[0051] Performance testing: The degradation rate of the groundwater simulation solution prepared in this embodiment was tested each time during 10 consecutive reuses of the degradation and purification agent using the same method as in Example 1 above. The results are as follows: Figure 8 As shown, the degradation rate of the degrading and purifying agent in this embodiment decreases continuously with the increase of usage times, and its ability to maintain a good purification effect over a long period of time is significantly reduced.
[0052] Example 5: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Add zeolite powder with a fineness of 60 mesh, cobalt salt (CoCl2), and iron salt (FeCl3) to water and stir evenly to form a mixture, wherein the mass ratio of the sepiolite powder to the total mass of the cobalt salt and iron salt is 1:0.36. 2+ Fe 3+ The molar ratio was 2:1. The mixture was then heated to 70°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 10. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 750°C at a heating rate of 10°C / min and held for 2 hours. Finally, it was cooled to room temperature to obtain the active catalyst powder for later use.
[0053] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1g:14.5mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 200-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0054] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.27 and stirred evenly. Then, the slow-release membrane liquid is sprayed onto the core particles and dried to obtain a degradation and purification agent with a coating thickness of about 0.8 mm (e.g., Figure 9 (As shown).
[0055] Performance testing: The degradation rate of the groundwater simulation solution prepared in this embodiment was tested each time during 10 consecutive reuses of the degradation and purification agent using the same method as in Example 1 above. The results are as follows: Figure 10 As shown, the degradation rate of the degrading and purifying agent in this embodiment decreases continuously with the increase of usage times, and its ability to maintain a good purification effect over a long period of time is significantly reduced.
[0056] Example 6: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Add kaolin with a fineness of 80 mesh, cobalt salt (Co(NO3)2), and iron salt (Fe(NO3)3) to water and stir evenly to form a mixture, wherein the mass ratio of sepiolite powder to the total mass of cobalt salt and iron salt is 1:0.32. 2+ Fe 3+ The molar ratio was 2:1. The mixture was then heated to 60°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 12. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 740°C at a heating rate of 10°C / min and held for 2.5 hours. The mixture was then cooled to room temperature to obtain the active catalyst powder for later use.
[0057] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1 g: 13 mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 150-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10 wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0058] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.3 and stirred evenly. Then the slow-release membrane liquid is sprayed onto the core particles and dried to obtain a degradation and purification agent with a coating thickness of about 1.1 mm.
[0059] Performance testing: The degradation rate of the groundwater simulation solution prepared in this embodiment was tested each time during 10 consecutive reuses of the degradation and purification agent using the same method as in Example 1 above. The results are as follows: Figure 11 As shown, the degradation rate of the degrading and purifying agent in this embodiment decreases continuously with the increase of usage times, and its ability to maintain a good purification effect over a long period of time is significantly reduced.
[0060] Example 7: A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, comprising the following steps: (1) Carbon nanotubes, cobalt salt (CoSO4), and iron salt (Fe2(SO4)3) are added to water and stirred evenly to form a mixture, wherein the mass ratio of sepiolite powder to the total mass of cobalt salt and iron salt is 1:0.3. 2+ Fe 3+ The molar ratio was 2:1. The mixture was then heated to 80°C and held at that temperature. Sodium hydroxide solution was added while stirring to adjust the pH of the mixture to 11. After that, the solid was filtered out, washed with water, and dried. Then, the temperature was increased to 700°C at a heating rate of 10°C / min and held for 4 hours. Finally, it was cooled to room temperature to obtain the active catalyst powder for later use.
[0061] (2) Activated carbon and a saturated aqueous solution of potassium persulfate were mixed at a ratio of 1 g: 10 mL and stirred evenly. After freeze-drying, the resulting product was ground and then passed through a 250-mesh sieve to obtain modified activated carbon powder. The modified activated carbon powder was then mixed evenly with a 10 wt.% anhydrous ethanol solution of polyethylene glycol (PEG400) at a mass ratio of 1:0.2, granulated, and then dried to obtain core particles with a particle size distribution between 3 and 5 mm.
[0062] (3) The styrene-butadiene-styrene block copolymer emulsion and the active catalyst powder prepared in this embodiment are mixed at a mass ratio of 1:0.34 and stirred evenly. Then the slow-release membrane liquid is sprayed onto the core particles and dried to obtain a degradation and purification agent with a coating thickness of about 1.5 mm.
[0063] Performance testing: The degradation rate of the groundwater simulation solution prepared in this embodiment was tested each time during 10 consecutive reuses of the degradation and purification agent using the same method as in Example 1 above. The results are as follows: Figure 12As shown, the degradation rate of the degrading and purifying agent in this embodiment decreases continuously with the increase of usage times, and its ability to maintain a good purification effect over a long period of time is significantly reduced.
[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A preparation process for a slow-release groundwater organic pollutant degradation and purification agent, characterized in that, Includes the following steps: (1) Add sepiolite powder, cobalt salt and iron salt to water and mix well. Then heat the mixture and adjust it to alkaline under stirring. After completion, separate the solid, wash and dry it, and then calcine it to obtain active catalyst powder for later use. (2) The activated carbon was mixed with a saturated persulfate solution and then freeze-dried, followed by grinding to obtain modified activated carbon powder. The modified activated carbon powder was granulated and dried to obtain core particles; (3) The styrene-butadiene-styrene block copolymer emulsion is mixed with the active catalyst powder to obtain a slow-release membrane liquid. Then the slow-release membrane liquid is coated onto the surface of the core particles. After drying, it is placed in anhydrous ethanol and stirred. After completion, the particles are separated and dried to obtain the degradation and purification agent.
2. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (1), the mass ratio of the sepiolite powder to the total of cobalt salt and iron salt is 1:0.3~0.36; optionally, the fineness of the sepiolite powder is 60~120 mesh.
3. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (1), the Co provided by the cobalt salt 2+ Fe provided by iron salts 3+ The molar ratio is 2:
1.
4. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (1), the cobalt salt includes at least one of cobalt chloride, cobalt nitrate, and cobalt sulfate; Optionally, in step (1), the iron source includes at least one of ferric chloride, ferric nitrate, and ferric sulfate.
5. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (1), the heating temperature is 60~80℃; Optionally, in step (1), the mixture is adjusted to be alkaline by adding at least one of sodium hydroxide, potassium hydroxide, and ammonia solution; optionally, the pH of the alkaline solution is 10-12.
6. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (1), the calcination treatment is carried out at a temperature of 700~750℃ for 2~4 hours.
7. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (2), the solid-liquid ratio of the activated carbon to the persulfate saturated solution is 1g: 10~14.5mL; Optionally, in step (2), the persulfate includes at least one of permonosulfate and perdisulfate; Optionally, in step (2), the fineness of the modified activated carbon powder is not less than 150 mesh.
8. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (2), the particle size of the core particles is 2~5mm.
9. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to claim 1, characterized in that, In step (3), the mass ratio of the styrene-butadiene-styrene block copolymer emulsion to the active catalyst powder is 1:0.27~0.
34.
10. The preparation process of the slow-release groundwater organic pollutant degradation and purification agent according to any one of claims 1-9, characterized in that, In step (3), the thickness of the coating film formed on the surface of the degradation and purification agent is 0.8~1.5mm.