Orp regulating slow-release material, and preparation method and application thereof

Abstract

The application relates to an ORP regulating slow-release material and a preparation method and application thereof. Biomass is crushed and added into deoxygenated purified water, then polyvinylpyrrolidone is added, and an iron salt is stirred; after centrifugation, drying is performed to obtain an iron-carbon core-shell precursor; the iron-carbon core-shell precursor is calcined under an N2 atmosphere to obtain an iron-carbon core-shell material; cerium nitrate is dissolved in ammonia water, the iron-carbon core-shell material is added, stirring is performed, centrifugal separation is carried out, drying is performed, and finally, roasting is performed to obtain the ORP regulating slow-release material. The prepared ORP regulating slow-release material can effectively utilize a CeO2 layer as a barrier to isolate the water body from the erosion of Cl- to Fe 0 @C core, and accurately regulate the micro-electrolysis speed of Fe 0 @C. The mechanism ensures that the oxidation-reduction potential (ORP) in the anaerobic degradation system is maintained stable for a long time, an optimized living environment is constructed for a microbial community, and finally, good biological degradation efficiency and stable microbial community structure of the anaerobic degradation system are promoted.

Description

Technical Field

[0001] This invention relates to the field of water pollutant treatment, specifically to an ORP-regulated slow-release material, its preparation method, and its application. Background Technology

[0002] Oxidation-reduction potential (ORP) is one of the important parameters in anaerobic degradation systems. It is an indicator of the oxidizing and reducing properties in a solution and reflects the balance between oxidants and reductants.

[0003] Under anaerobic conditions, microorganisms typically utilize other compounds instead of oxygen as the terminal electron acceptor for energy metabolism. Changes in ORP can regulate the activity of microbial metabolic pathways and the rate of product formation. During anaerobic fermentation, it is sometimes necessary to prevent excessive reduction and oxidation reactions. Maintaining an appropriate ORP can reduce the presence of oxidants, thereby slowing down or preventing unintended redox reactions and protecting the degradation performance of pollutants and methane yield. However, excessively high or low ORP can inhibit the anaerobic degradation system. When ORP is too high, VFAs may accumulate in the system, leading to a decrease in pH, which inhibits microbial activity and growth, resulting in reduced wastewater treatment efficiency and increased system operating costs. When ORP is too low, the system pH may slightly increase, and the excessively low pH can inhibit the hydrolysis and acidification of anaerobic microorganisms, even the methanogenesis stage, significantly reducing the usability of the anaerobic digestion system. Furthermore, oxidants produced during anaerobic digestion can increase ORP, accelerating the corrosion of materials, thus making ORP regulation unstable.

[0004] Only a long-term stable ORP can ensure that the anaerobic degradation system is in optimal condition. Therefore, controlling the ORP at an appropriate potential is a key measure to ensure the long-term stable operation of the anaerobic degradation system.

[0005] This invention utilizes an ORP-regulating slow-release material to ensure that the ORP of wastewater remains within a suitable range during anaerobic degradation. Secondly, this material not only acts as a nucleus for microbial growth and reproduction, providing a favorable environment for anaerobic microorganisms, but also maintains the long-term health and stability of the anaerobic degradation system. Thirdly, this material aids in the oxidation of pollutants, transforming them from macromolecules into smaller molecules that are easily degraded and utilized by anaerobic microorganisms, thereby further promoting the performance of the anaerobic degradation system. In summary, this Famine material, by preparing an ORP-regulating slow-release material, maintains the ORP within an appropriate range, ensuring long-term ORP stability and pollutant degradation performance in the anaerobic degradation system, resulting in a superior biodegradation effect. Summary of the Invention

[0006] Technical Problem Solved: To address the above-mentioned technical problems, this invention provides an ORP-regulated slow-release material, its preparation method, and its application. This material ensures the long-term stability of ORP in wastewater during anaerobic degradation by preparing an ORP-regulated slow-release material. Secondly, this material not only acts as a nucleus for microbial growth and reproduction, providing a favorable environment for the growth and reproduction of anaerobic microorganisms, but also maintains the long-term health and stability of the anaerobic degradation system. Thirdly, this material can aid in the oxidation of pollutants through iron-carbon micro-electrolysis, transforming them from macromolecular substances into medium and small molecules that are easily degraded and utilized by anaerobic microorganisms, thereby further promoting the performance of the anaerobic degradation system. Finally, when the Cl in the water... - When corroding ORP-modifying materials, CeO2 can shield Cl. - The corrosion resistance of ORP regulating materials is reduced, and excessively rapid iron-carbon micro-electrolysis is avoided, thereby ensuring long-term stability and good biodegradability of ORP regulating capacity.

[0007] Technical Solution: A method for preparing an ORP-regulated sustained-release material, comprising the following steps: 1) Preparation of an iron-carbon core-shell precursor: biomass is pulverized and added to deoxygenated purified water, then polyvinylpyrrolidone is added, followed by iron salt and stirring; after centrifugation and drying, an iron-carbon core-shell precursor is obtained; the mass concentration of polyvinylpyrrolidone in the reaction system is 0.5% to 1%, and the mass ratio of iron salt to biomass is (1 to 20):1; 2) Preparation of the iron-carbon core-shell material: the iron-carbon core-shell precursor is calcined under a N2 atmosphere to obtain the iron-carbon core-shell material; 3) Fe 0 Preparation of @C@CeO2 sustained-release material: Cerium nitrate was dissolved in ammonia water, and iron-carbon core-shell material was added. The mass ratio of cerium nitrate to iron-carbon core-shell material was 1:(1~10). After stirring, the mixture was centrifuged and dried, and finally calcined to obtain ORP-regulated sustained-release material.

[0008] Preferably, the above-mentioned biomass is tea residue, rice straw residue, coconut shell or winter melon peel.

[0009] Preferably, the mesh size of the above-mentioned biomass after pulverization is 500 to 2500 mesh.

[0010] Preferably, the iron salt is ferric sulfate, ferric nitrate or ferric chloride.

[0011] Preferably, the mass ratio of the iron salt to the biomass is (1-10):1; the centrifugation time is 5-20 min; and the vacuum drying time is 8-24 h.

[0012] Preferably, the calcination temperature in step 2) above is 400–900°C, and the reaction time is 1–8 h.

[0013] Preferably, the calcination temperature in step 3) above is 600-1000℃ and the reaction time is 1-8h.

[0014] The ORP-regulated sustained-release material was prepared by the above method.

[0015] The application of the above-mentioned ORP-regulated sustained-release materials in electrochemical catalytic systems.

[0016] Beneficial effects: The Fe prepared by this invention 0 @C@CeO2 ORP controlled-release material can effectively utilize the CeO2 layer as a barrier to isolate chloride ions (Cl) in water. - ) for Fe 0 @C core erosion, thereby precisely controlling Fe 0 The micro-electrolysis rate of @C ensures the long-term stability of the redox potential (ORP) in the anaerobic degradation system, creating an optimized living environment for the microbial community and ultimately promoting the formation of good biodegradation efficiency and a stable microbial community structure in the anaerobic degradation system. Attached Figure Description

[0017] Figure 1 The catalysts are Fe 0 @C@CeO2、Fe 0 Changes in ORP of the anaerobic degradation system over two months when using @C and CeO2.

[0018] Figure 2 The catalysts are Fe 0 @C@CeO2、Fe 0 The degradation efficiency of 2048 mg / L terephthalic acid at @C and CeO2.

[0019] Figure 3 The catalysts are Fe 0 @C@CeO2、Fe 0 The degradation efficiency of 2048 mg / L isophthalic acid at @C and CeO2.

[0020] Figure 4 The catalysts are Fe, respectively. 0 @C@CeO2、Fe 0 Degradation efficiency of 3000 mg / L TA acid at @C and CeO2.

[0021] Figure 5 The catalysts are Fe 0 @C@CeO2、Fe 0 Cyclic voltammetry curves for @C and CeO2.

[0022] Figure 6 When the concentration of terephthalic acid is 2048 mg / L, the catalyst is Fe. 0 @C@CeO2、Fe 0The long-term degradation efficiency curve of terephthalic acid after continuous reaction with C and CeO2 for 61 days.

[0023] Figure 7 The bar chart shows the degradation efficiency of terephthalic acid among ten examples when the pollutant is terephthalic acid at a concentration of 2048 mg / L.

[0024] Figure 8 The bar chart shows the degradation efficiency of isophthalic acid among ten examples when the pollutant is isophthalic acid with a concentration of 2048 mg / L.

[0025] Figure 9 Fe prepared using different biomass as carbon sources 0 ORP regulation performance of @C@CeO2. Detailed Implementation

[0026] Cyclic voltammetry (CV) testing: Using a Pt sheet electrode as the counter electrode, Ag / AgCl as the reference electrode, and the cathode as the working electrode for CV analysis, cyclic voltammetry (CV) curves were performed using an electrochemical workstation. The voltage scan range for CV was -0.8 to -0.8 V, and the scan rate was 10 mV / s.

[0027] Terephthalic acid, isophthalic acid, and TA acid testing: Terephthalic acid, isophthalic acid, and TA acid were detected by high performance liquid chromatography (HPLC, Agilent, US). Specifically, the column oven was operated at 40℃, and the degradation efficiency was calculated according to formula (1):

[0028] Degradation rate = (1-C1 / C0)×100% Equation (1)

[0029] C0: Influent concentration (mg / L); C1: Effluent concentration (mg / L)

[0030] Example 1

[0031] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0032] (1) Grind 33g of tea residue using a high-speed blender, sieve it through a 500-mesh sieve, then place it in anaerobic purified water, add 0.15g of polyvinylpyrrolidone (PVP) and 11g of FeCl3, and stir. Centrifuge for 10 min, and then dry in a vacuum drying oven for 8 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0033] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 600°C for 1 hour under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0034] (3) Dissolve 11g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and dried in a vacuum drying oven for 4 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 3 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0035] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0036] Example 2

[0037] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0038] (1) Grind 20g of rice straw into powder using a high-speed blender, sieve it through a 1500 mesh, then place it in anaerobic purified water, add 0.05g of polyvinylpyrrolidone (PVP) and 10g of FeSO4, and stir. Centrifuge for 10 min, and then dry in a vacuum drying oven for 8 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0039] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 600°C for 1 hour under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0040] (3) Dissolve 11g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and dried in a vacuum drying oven for 4 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 3 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0041] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0042] Example 3

[0043] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0044] (1) Grind 60g of coconut shell using a high-speed blender, sieve through a 2500 mesh, then place it in anaerobic purified water, add 0.15g of polyvinylpyrrolidone (PVP) and 10g of FeCl3, and stir. Centrifuge for 5 min, and then dry in a vacuum drying oven for 8 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0045] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 800°C for 2 hours under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0046] (3) Dissolve 20g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and dried in a vacuum drying oven for 4 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 3 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0047] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0048] Example 4

[0049] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0050] (1) Grind 10g of winter melon peel into powder using a high-speed blender, sieve it through a 500-mesh sieve, then place it in anaerobic purified water, add 0.05g of polyvinylpyrrolidone (PVP) and 10g of FeCl3, and stir. Centrifuge for 5 min, and then dry in a vacuum drying oven for 6 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0051] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 700°C for 1 hour under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0052] (3) Dissolve 20g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0@C core-shell material was added, stirred for 1 hour, centrifuged, and dried in a vacuum drying oven for 4 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 3 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0053] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0054] Example 5

[0055] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0056] (1) Grind 20g of rice straw into powder using a high-speed blender, sieve it through a 2500 mesh screen, then place it in anaerobic purified water, add 0.05g of polyvinylpyrrolidone (PVP) and 20g of FeSO4, and stir. Centrifuge for 5 min, and then dry in a vacuum drying oven for 8 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0057] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 600°C for 2 hours under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0058] (3) Dissolve 20g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and then dried in a vacuum drying oven for 3 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 2 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0059] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0060] Example 6

[0061] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0062] (1) Grind 60g of tea residue using a high-speed blender, sieve it through a 1500 mesh, then place it in anaerobic purified water, add 0.25g of polyvinylpyrrolidone (PVP) and 40g of FeCl3, and stir. Centrifuge for 10 min, and then dry in a vacuum drying oven for 8 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0063] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 800°C for 1 hour under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0064] (3) Dissolve 40g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and then dried in a vacuum drying oven for 4 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 1 hour to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0065] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0066] Example 7

[0067] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0068] (1) Grind 30g of rice straw into powder using a high-speed blender, sieve it through a 2500 mesh screen, then place it in anaerobic purified water, add 0.05g of polyvinylpyrrolidone (PVP) and 30g of FeSO4, and stir. Centrifuge for 10 min, and then dry in a vacuum drying oven for 12 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0069] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 800°C for 2 hours under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0070] (3) Dissolve 15g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0@C core-shell material was added, stirred for 2 hours, centrifuged, and then dried in a vacuum drying oven for 2 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 1 hour to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0071] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0072] Example 8

[0073] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0074] (1) Grind 15g of coconut shell using a high-speed blender, sieve through a 1000-mesh sieve, then place it in anaerobic purified water, add 0.05g of polyvinylpyrrolidone (PVP) and 20g of FeCl3, and stir. Centrifuge for 10min, and then dry in a vacuum drying oven for 12h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0075] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 800°C for 2 hours under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0076] (3) Dissolve 20g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and then dried in a vacuum drying oven for 3 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 2 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0077] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0078] Example 9

[0079] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0080] (1) Grind 50g of tea residue using a high-speed blender, sieve it through a 2500 mesh, then place it in oxygen-free purified water, add 0.15g of polyvinylpyrrolidone (PVP) and 10g of FeSO4, and stir. Centrifuge for 5 min, and then dry in a vacuum drying oven for 12 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0081] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 800°C for 3 hours under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0082] (3) Dissolve 30g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0 @C core-shell material was added, stirred for 2 hours, centrifuged, and then dried in a vacuum drying oven for 3 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 3 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0083] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0084] Example 10

[0085] In this embodiment, the specific preparation method of the ORP-regulated sustained-release material is as follows:

[0086] (1) Grind 40g of tea residue using a high-speed blender, sieve it through a 2500 mesh, then place it in anaerobic purified water, add 0.05g of polyvinylpyrrolidone (PVP) and 40g of FeCl3, and stir. Centrifuge for 10 min, and then dry in a vacuum drying oven for 8 h to obtain the iron-carbon core-shell precursor Fe. 0 @C.

[0087] (2) The Fe from step (1) 0 The @C core-shell material precursor was placed in a tube furnace and calcined at 700°C for 4 hours under a N2 atmosphere to obtain the iron-carbon core-shell material.

[0088] (3) Dissolve 40g of cerium nitrate in 500mL of 15% ammonia solution and stir thoroughly for 20min. After the cerium nitrate has completely dissolved, add the Fe prepared in step (2). 0@C core-shell material was added, stirred for 2 hours, centrifuged, and then dried in a vacuum drying oven for 3 hours. Finally, it was placed in a tube furnace and calcined at 1000℃ for 3 hours to obtain Fe. 0 @C@CeO2 ORP-regulated sustained-release material.

[0089] The prepared Fe 0 @C@CeO2 ORP controlled-release material is used to regulate the long-term stability of ORP in wastewater in anaerobic degradation systems, improve the pollutant degradation capacity of anaerobic degradation systems, and build excellent microbial communities in anaerobic degradation systems.

[0090] This invention is not limited to the above-described embodiments. For those skilled in the art, after learning the contents described in this invention, several equivalent modifications and substitutions can be made without departing from the principle of this invention, and these equivalent modifications and substitutions should also be considered to fall within the protection scope of this invention.

Claims

1. A method for preparing an ORP-regulated sustained-release material, characterized in that, Includes the following steps: 1) Preparation of iron-carbon core-shell precursor: Biomass is pulverized and added to deoxygenated purified water, then polyvinylpyrrolidone is added, followed by iron salt and stirring; after centrifugation and drying, the iron-carbon core-shell precursor is obtained; the mass concentration of polyvinylpyrrolidone in the reaction system is 0.5%~1%, and the mass ratio of iron salt to biomass is (1~20):1; 2) Preparation of iron-carbon core-shell material: The iron-carbon core-shell precursor is calcined under a N2 atmosphere to obtain the iron-carbon core-shell material; 3) Fe 0 Preparation of @C@CeO2 sustained-release material: Cerium nitrate was dissolved in ammonia water, and iron-carbon core-shell material was added. The mass ratio of cerium nitrate to iron-carbon core-shell material was 1:(1~10). After stirring, centrifugation and drying were performed, and finally calcination was carried out to obtain ORP-regulated sustained-release material.

2. The method for preparing the ORP-regulated sustained-release material according to claim 1, characterized in that, The biomass is tea residue, rice straw residue, coconut shell, or winter melon peel.

3. The method for preparing the ORP-regulated sustained-release material according to claim 1, characterized in that, The mesh size of the biomass after pulverization is 500~2500 mesh.

4. The method for preparing the ORP-regulated sustained-release material according to claim 1, characterized in that, The iron salt is ferric sulfate, ferric nitrate, or ferric chloride.

5. The method for preparing the ORP-regulated sustained-release material according to claim 1, characterized in that, The mass ratio of iron salt to biomass is (1~10):1; the centrifugation time is 5~20 min; and the vacuum drying time is 8 h~24 h.

6. The method for preparing the ORP-regulated sustained-release material according to claim 1, characterized in that, In step 2), the calcination temperature is 400~900 ℃ and the reaction time is 1~8 h.

7. The method for preparing the ORP-regulated sustained-release material according to claim 1, characterized in that, In step 3), the calcination temperature is 600~1000 ℃ and the reaction time is 1~8 h.

8. The ORP-regulated sustained-release material prepared by any one of claims 1-7.

9. The application of the ORP-regulated sustained-release material according to claim 8 in an electrochemical catalytic system.

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