Friction power generation self-powered bionic gill agricultural water purification device

Abstract

The utility model discloses a friction power generation self-powered bionic gill agricultural water purification device which comprises a power generation unit for friction power generation and a bionic gill unit for water purification, and the power generation unit is used for supplying power to the bionic gill unit; the power generation unit comprises a connection pipe, the outer side wall of which is provided with a friction power generation electrode; the turbine pipe is arranged in the connecting pipe in a sleeved mode, and turbine blades capable of being driven by water flow to rotate are arranged in the turbine pipe; a first magnet is arranged on the turbine pipe; the connecting pipe is sleeved with the outer frame pipe, and a second magnet is arranged on the outer frame pipe; in the rotating process of the turbine pipe, the first magnet drives the second magnet, so that the outer frame pipe rotates; the inner side wall of the outer frame pipe is provided with a friction material which generates friction with the friction power generation electrode to generate power in the rotating process of the outer frame pipe. Each bionic gill unit comprises an anode layer, a cathode conductive film and an insulating layer located between the anode layer and the cathode conductive film. The cathode conductive film is provided with gill wires which protrude outwards and serve as cathodes.

Description

Technical Field

[0001] This utility model relates to the field of agricultural water purification technology, and in particular to a biomimetic fish gill agricultural water purification device that generates electricity through friction. Background Technology

[0002] Currently, pollution of agricultural water bodies mainly manifests as heavy metal ions and tetracycline pollution. Heavy metal ions, such as lead, mercury, and cadmium, have become one of the main sources of water pollution due to their high toxicity and difficulty in degradation. Tetracycline, an antibiotic widely used in animal husbandry, leads to antibiotic residues in water bodies due to excessive use, further exacerbating the degree of water pollution.

[0003] Traditional agricultural water purification methods mainly include chemical and biological treatment. Chemical treatment methods add chemical reagents such as flocculants and oxidants to precipitate or oxidize pollutants. Although this can significantly reduce pollutant concentrations in a short time, its high cost and potential secondary pollution problems limit its application. Biological treatment methods utilize the degradation capabilities of microorganisms, achieving pollutant degradation through the construction of artificial wetlands or biofilters. However, biological treatment methods require long treatment cycles and large land areas, and are greatly affected by environmental conditions, making it difficult to achieve efficient and stable purification results.

[0004] Furthermore, traditional purification methods generally suffer from high energy consumption and complex operation, which not only increases purification costs but also imposes additional burdens on the environment. Therefore, developing a self-powered, efficient, and low-cost agricultural water purification device is of paramount practical significance. This device can effectively remove heavy metal ions and tetracyclines from water and achieve self-powering through energy recovery technology, thereby significantly reducing operating costs, improving purification efficiency, and providing a new technological path for the sustainable purification of agricultural water bodies.

[0005] The rapid rise of triboelectric nanogenerators (TENGs) has spurred the emergence of self-powered design concepts for agricultural environments. Currently, commonly used triboelectric layer materials are primarily polymers, especially those with good flexibility and strong electron-donating capabilities, including polytetrafluoroethylene (PTFE), polydimethylsiloxane (PDMS), and polyimide (PI). These can be used to develop blue energy, in vivo health monitoring devices, and battery-free environmental monitoring devices. Therefore, there are numerous reports on the application of triboelectric nanogenerators in energy harvesting and environmental sensing.

[0006] Triboelectric power generation devices utilize water flow in agricultural environments, such as the flow of water in irrigation pipes. Because the friction layer cannot come into contact with water, the drive and friction components of the power generation device must be separated. The drive component uses turbine blades to rotate in sync with the water flow. Magnets are installed on the outer frames of the impeller and the friction layer, and magnetic coupling is used to drive the friction layer to rotate, thus achieving the effect of triboelectric power generation.

[0007] Electroadsorption, also known as CDI (capacitive deionization), is a novel water treatment technology that utilizes the adsorption of ions and charged particles from water onto the surface of charged electrodes. This concentrates dissolved salts and other charged substances on the electrode surface, achieving water purification / desalination. Electrooxidation, on the other hand, is an applied electric field process where pollutants are oxidized, degraded, or transformed at the anolyte. It offers advantages such as mild reaction conditions, low substrate selectivity, no need for additional chemicals, modular assembly, and ease of large-scale commercial application, making it a common water treatment technology. The synergistic effect of these two technologies can significantly improve the effectiveness and efficiency of water treatment.

[0008] Currently, commercial agricultural water purification devices are the main means of improving water quality in agricultural production. Their working principle mainly consists of three steps: physical filtration, chemical treatment, and biological treatment. While activated carbon is used to adsorb heavy metal ions and tetracyclines in the water, the effect is minimal. Furthermore, these devices are large in size, inefficient, and have limited energy supply, restricting their application scenarios. Therefore, developing self-powered, efficient, and low-cost agricultural water purification devices for agricultural water purification is imperative. Summary of the Invention

[0009] To address the problems existing in the background technology, this utility model provides a biomimetic fish gill agricultural water purification device that generates electricity through triboelectric power. It utilizes water flow to drive triboelectric power generation and provides electrical energy to the fish gill agricultural water purification unit. The biomimetic fish gill unit mainly removes heavy metal ions in the water through electro-adsorption, while it can remove organic pollutants such as tetracycline in the water through electro-oxidation.

[0010] This utility model provides a biomimetic fish gill agricultural water purification device that generates electricity through friction and is self-powered, including a power generation unit for friction generation and a biomimetic fish gill unit for water purification. The power generation unit supplies power to the biomimetic fish gill unit through a conductive film of silver nanowires connected by wires.

[0011] The power generation unit includes:

[0012] A connecting tube is a cylindrical structure with openings at both ends, and a triboelectric electrode is provided on the outer wall of the connecting tube.

[0013] A turbine tube is fitted inside the connecting pipe, and turbine blades that can be driven to rotate by water flow are provided inside the turbine tube; a first magnet is provided on the turbine tube.

[0014] An outer frame tube is fitted over the connecting tube, and a second magnet is provided on the outer frame tube; during the rotation of the turbine tube, the first magnet drives the second magnet, thereby causing the outer frame tube to rotate; the inner sidewall of the outer frame tube is provided with a friction material that generates electricity by rubbing against the triboelectric electrode during the rotation of the outer frame tube.

[0015] The biomimetic gill unit includes:

[0016] An anode layer, a cathode conductive film, and an insulating layer located between the anode layer and the cathode conductive film;

[0017] The cathode conductive film has outwardly protruding gill filaments serving as cathodes. Each gill filament includes an internal support pillar and a carbon nanotube layer modified on the support pillar. Carbon nanotubes are selected as the modification material. Carbon nanotubes and their derivatives can enhance enrichment, accelerate the electrocatalytic process, and improve pollutant removal kinetics through their excellent adsorption properties.

[0018] In some embodiments of this utility model, the connecting pipe is provided with a support frame; the power generation unit further includes a central shaft; the turbine tube has a central shaft hole, the central shaft passes through the central shaft hole and is fixedly connected to the turbine tube; the central shaft is rotatably connected to the support frame through a first bearing, the outer ring of the first bearing is fixed to the support frame, and the inner ring is fixed to the central shaft.

[0019] In some embodiments of this utility model, the outer frame tube is rotatably connected to the connecting tube via a second bearing, the outer frame tube is fixed to the outer ring of the second bearing, and the connecting tube is fixed to the inner ring of the second bearing.

[0020] In some embodiments of this utility model, the outer wall of the turbine tube is provided with a plurality of first magnets arranged circumferentially at intervals; the outer wall of the outer frame tube is provided with a plurality of second magnets arranged circumferentially at intervals.

[0021] Furthermore, each of the first magnet and the second magnet is elongated; the outer wall of the turbine tube is provided with a first mounting groove for installing the first magnet, each of the first magnets is installed in a first mounting groove, and the first magnets are arranged along the axial direction of the turbine tube; the outer wall of the outer frame tube is provided with a second mounting groove for installing the second magnet, each of the second magnets is installed in a second mounting groove, and the second magnets are arranged along the axial direction of the outer frame tube.

[0022] Preferably, the friction material must be animal fur with good frictional properties, such as rabbit hair or wool. Rabbit hair fibers are fine and soft, with abundant scales on the surface, a structure that helps increase friction. The softness of rabbit hair also allows it to generate a large contact area when in contact with other materials, thereby improving the efficiency of charge generation.

[0023] The friction material used for friction must be of equal length and be trimmed and arranged neatly.

[0024] Preferably, the distance between the outer wall of the connecting tube and the inner wall of the outer frame tube is 5.9~10.9mm; the length of the friction material is greater than this distance. The distance between the outer wall of the connecting tube and the inner wall of the outer frame tube should not be too small, otherwise the friction material will be excessively compressed, resulting in poor power generation; the distance should also not be too large, otherwise the magnetic coupling effect between the magnets will be weak, which is insufficient to drive the outer frame tube to rotate and generate electricity.

[0025] More preferably, the distance between the outer side wall of the connecting tube and the inner side wall of the outer frame tube is 6.9 mm.

[0026] In some embodiments of this utility model, the outer wall of the connecting tube is provided with a plurality of triboelectric electrodes evenly arranged in the circumferential direction, each triboelectric electrode extending along the axial direction of the connecting tube; the inner wall of the outer frame tube is provided with a plurality of friction material strips evenly arranged in the circumferential direction, each friction material strip extending along the axial direction of the outer frame tube, and each friction material strip is formed by the aggregation of friction material.

[0027] In some embodiments of this utility model, the triboelectric electrode can be a copper electrode, and it needs to be completely covered with polytetrafluoroethylene (PTFE). The outer wall of the connecting tube has electrodes evenly arranged circumferentially, with a gap of 4-7 mm between them. Each copper electrode has a consistent width, matching the width of the friction material strip, and is evenly distributed on the inner surface of the outer frame tube. As exemplified in one embodiment of this utility model, six equally spaced copper electrodes can be evenly attached circumferentially to the outer wall of the connecting tube, connecting non-adjacent portions, and then the copper electrodes of the friction portion are completely covered with PTFE. On the inner wall of the rotating outer frame tube, three strips of rabbit hair, the same width as the copper electrodes, are evenly attached at intervals.

[0028] In some embodiments of this utility model, in the biomimetic gill unit, the anode layer is a titanium plate, the cathode conductive film is a silver nanowire conductive film, and the insulating layer is a polyethylene sponge.

[0029] The support pillars inside the gill filaments are made of foamed silicone.

[0030] The material used as the cathode substrate has a significant impact on the efficiency and sustainability of electroadsorption and electrooxidation. Foamed silica gel is usually chosen because it has good electrical properties. After being modified with carbon nanotubes, it becomes conductive. Moreover, the material is non-toxic, non-corrosive, and has good stability. It will not degrade and pollute the aquatic environment. Its water resistance allows it to exist stably in the aquatic environment, enabling electroadsorption and electrooxidation to proceed stably for a long time.

[0031] The method for preparing the gill filaments is as follows:

[0032] (1) First, a certain amount of raw carbon nanotubes were dispersed in DI-H2O (deionized water) for 15 minutes by ultrasonication with a probe for 15 minutes. Sodium dodecylbenzenesulfonate (SDBS) was used as a surfactant to improve its solubility, thereby preparing carbon nanotube ink (in a typical preparation, 0.3 mg / mL was used). -1 CNTs and 2 mg mL -1 SDBS).

[0033] (2) A gill-like pattern was made using foamed silica gel with good electrical properties and water resistance. The pattern was then immersed in carbon nanotube ink and dried at 120°C for 30 min. The carbon nanotube loading was obtained by measuring the mass difference before and after the foamed silica gel was immersed and dried. This dyeing process was repeated to increase the carbon nanotube loading and the conductivity of the foamed silica gel.

[0034] (3) The prepared carbon nanotube foamed silica gel was heated at room temperature with 4 mol L -1 Treatment with HNO3 solution for 6 h removes excess SDBS surfactant.

[0035] The beneficial effects of this utility model are:

[0036] (1) This utility model proposes a biomimetic fish gill agricultural water purification device that generates electricity through friction and is self-powered. It does not require an external power source and relies entirely on friction generation technology to achieve self-powering, thus reducing operating costs. At the same time, it generates electricity using natural forces, thereby reducing environmental pollution.

[0037] (2) Compared with traditional purification methods that mainly rely on chemical and biological treatment, the biomimetic fish gill agricultural water purification unit improves the efficiency of water purification through dual purification technologies of water electrolysis and biological filtration. At the same time, it reduces labor costs, eliminates concerns about secondary pollution, and can operate stably and efficiently without being limited by environmental conditions. Attached Figure Description

[0038] Figure 1 This is a diagram of the power generation unit of this utility model;

[0039] Figure 2 This is a front view of the power generation unit of this utility model;

[0040] Figure 3 for Figure 2 AA cut diagram in the image;

[0041] Figure 4 Diagram of turbine tube and center axis;

[0042] Figure 5 This is a front view of the turbine tube and its central axis.

[0043] Figure 6 This is a diagram of the biomimetic fish gill unit of this utility model;

[0044] Figure 7 This is a diagram of the connecting pipe of this utility model;

[0045] Figure 8 This is a diagram of the outer frame tube of this utility model;

[0046] Figure 9 This is a schematic diagram of the outer frame tube of this utility model;

[0047] The markings in the diagram are: 1-connecting tube, 11-triboelectric electrode, 12-support frame, 2-turbine tube, 21-turbine blade, 22-first mounting groove, 3-outer frame tube, 31-second bearing, 32-second mounting groove, 33-friction material strip, 4-anode layer, 5-cathode conductive film, 51-gill filament, 511-support column, 512-carbon nanotube layer, 6-insulating layer, 7-central shaft, 71-first bearing. Detailed Implementation

[0048] Example 1

[0049] Depend on Figure 1-9 As shown, this utility model provides a biomimetic fish gill agricultural water purification device that generates electricity through friction and is self-powered, including a power generation unit for friction generation and a biomimetic fish gill unit for water purification. The power generation unit is used to supply power to the biomimetic fish gill unit.

[0050] The power generation unit includes: a connecting pipe 1, a cylindrical structure with open ends, and a triboelectric electrode 11 on the outer wall of the connecting pipe 1; a turbine pipe 2, fitted inside the connecting pipe 1, and a turbine blade 21 that can be driven to rotate by water flow inside the turbine pipe 2; a first magnet on the turbine pipe 2; and an outer frame pipe 3, fitted outside the connecting pipe 1, and a second magnet on the outer frame pipe 3.

[0051] During the rotation of the turbine tube 2, the first magnet drives the second magnet, thereby causing the outer frame tube 3 to rotate; the inner sidewall of the outer frame tube 3 is provided with a friction material that generates electricity by rubbing against the triboelectric electrode 11 during the rotation of the outer frame tube 3.

[0052] The biomimetic gill unit includes: an anode layer 4, a cathode conductive film 5, and an insulating layer 6 located between the anode layer 4 and the cathode conductive film 5;

[0053] The cathode conductive film 5 has outwardly protruding gill filaments 51 serving as cathodes. Each gill filament includes an internal support pillar 511 and a carbon nanotube layer 512 modified on the support pillar 511. Carbon nanotubes are selected as the modification material in this invention because carbon nanotubes and their derivatives can enhance enrichment, accelerate the electrocatalytic process, and improve the pollutant removal kinetics through their excellent adsorption properties.

[0054] Specifically, the connecting pipe 1 is provided with a support frame 12 for fixing the central shaft so that the turbine tube rotates when the water flow drives the turbine blades; the power generation unit also includes a central shaft 7; the turbine tube 2 has a central shaft hole 23, the central shaft 7 passes through the central shaft hole 23 and is fixedly connected to the turbine tube 2; the central shaft 7 is rotatably connected to the support frame 12 through a first bearing 71, the outer ring of the first bearing 71 is fixed to the support frame 12, and the inner ring is fixed to the central shaft 7.

[0055] In this utility model, the outer frame tube 3 is rotatably connected to the connecting tube 1 through the second bearing 31, the outer frame tube 3 is fixed to the outer ring of the second bearing 31, and the connecting tube 1 is fixed to the inner ring of the second bearing 31.

[0056] Specifically, the outer wall of the turbine tube 2 is provided with multiple first magnets spaced apart circumferentially; the outer wall of the outer frame tube 3 is provided with multiple second magnets spaced apart circumferentially.

[0057] Furthermore, each of the first magnets and the second magnets is elongated; the outer wall of the turbine tube 2 is provided with a first mounting groove 22 for mounting the first magnet, each first magnet is mounted in a first mounting groove 22, and the first magnets are arranged along the axial direction of the turbine tube 2.

[0058] The outer wall of the outer frame tube 3 is provided with a second mounting groove 32 for mounting the second magnet. Each second magnet is mounted in a second mounting groove 32 and the second magnet is arranged along the axial direction of the outer frame tube 3.

[0059] In this invention, the friction material used must be animal fur with good frictional properties, such as rabbit hair or wool. Rabbit hair fibers are fine and soft, with abundant scales on the surface, a structure that helps increase friction. The softness of rabbit hair also allows it to generate a large contact area when in contact with other materials, thereby improving the efficiency of charge generation. In addition, the friction material used for friction must be of equal length and have been trimmed and neatly arranged.

[0060] In this invention, the distance between the outer wall of the connecting tube 1 and the inner wall of the outer frame tube 3 is 5.9~10.9mm; the length of the friction material is greater than this distance. That is, the distance between the outer wall of the connecting tube and the inner wall of the outer frame tube cannot be too small, as this will cause excessive compression of the friction material, resulting in poor power generation; the distance also should not be too large, as this will weaken the magnetic coupling effect between the magnets, making it insufficient to drive the outer frame tube to rotate and generate electricity. In the performance test of this invention, the best triboelectric power generation response was achieved when the distance between the outer wall of the connecting tube and the inner wall of the outer frame tube was 6.9mm.

[0061] More specifically, the outer wall of the connecting tube 1 is provided with several triboelectric electrodes 11 evenly arranged in the circumferential direction, and each triboelectric electrode 11 extends along the axial direction of the connecting tube 1; the inner wall of the outer frame tube 3 is provided with several friction material strips 33 evenly arranged in the circumferential direction, each friction material strip 33 extends along the axial direction of the outer frame tube 3, and each friction material strip 33 is formed by the aggregation of friction material.

[0062] In this invention, the triboelectric electrode can be a copper electrode, and it needs to be completely covered with polytetrafluoroethylene (PTFE). The outer wall of the connecting tube has electrodes evenly arranged circumferentially, with a gap of 4-7 mm between them. Each copper electrode has a consistent width, matching the width of the friction material strip, and is evenly distributed on the inner surface of the outer frame tube. In this embodiment, six equally spaced copper electrodes can be evenly attached circumferentially to the outer wall of the connecting tube, connecting the non-adjacent portions, and then completely covering the copper electrodes of the friction portion with PTFE. On the inner wall of the rotating outer frame tube, three strips of rabbit hair (with the same width as the copper electrodes) are evenly attached at intervals. Figure 7 and Figure 8 ).

[0063] The basic principle of the biomimetic gill unit is to use electrochemical principles to adsorb positively charged heavy metal ions onto the cathode, and then decompose and remove them through electro-oxidation. Therefore, the anode layer 4 of this unit uses a titanium plate with good electrical properties. A titanium plate is placed at the end of the biomimetic gill unit, and a piece of polyethylene sponge with good water permeability is used as an insulating medium to isolate the anode and cathode. The cathode includes a cathode conductive film 5 and gill filaments 51. The cathode conductive film 5 is a nano-silver wire conductive film, and the support pillars 511 inside the gill filaments 51 are made of foamed silicone.

[0064] The material used as the cathode substrate has a significant impact on the efficiency and sustainability of electroadsorption and electrooxidation. Foamed silica gel is usually chosen because it has good electrical properties. After being modified with carbon nanotubes, it becomes conductive. Moreover, the material is non-toxic, non-corrosive, and has good stability. It will not degrade and pollute the aquatic environment. Its water resistance allows it to exist stably in the aquatic environment, enabling electroadsorption and electrooxidation to proceed stably for a long time.

[0065] Gill filaments can be obtained through the following steps:

[0066] (1) First, a certain amount of raw carbon nanotubes were dispersed in DI-H2O (deionized water) for 15 minutes by ultrasonication with a probe for 15 minutes. Sodium dodecylbenzenesulfonate (SDBS) was used as a surfactant to improve its solubility, thereby preparing carbon nanotube ink (in a typical preparation, 0.3 mg / mL was used). -1 CNTs and 2 mg mL -1 SDBS).

[0067] (2) A gill-like pattern was made using foamed silica gel with good electrical properties and water resistance. The pattern was then immersed in carbon nanotube ink and dried at 120°C for 30 min. The carbon nanotube loading was obtained by measuring the mass difference before and after the foamed silica gel was immersed and dried. This dyeing process was repeated to increase the carbon nanotube loading and the conductivity of the foamed silica gel.

[0068] (3) The prepared carbon nanotube foamed silica gel was heated at room temperature with 4 mol L -1 Treatment with HNO3 solution for 6 h removes excess SDBS surfactant.

[0069] Finally, each piece is glued onto a thin cathode conductive film (neatly arranged), and combined with the aforementioned titanium plate and polyethylene sponge to form the main body of the biomimetic fish gill agricultural water purification unit, such as... Figure 6 As shown.

[0070] This utility model's power generation unit is used to power a bionic fish gill unit. The copper electrodes of the power generation unit are very thin and laid out very long. One connector of the wire used to connect the power generation unit and the bionic fish gill unit can extend from the electrode surface outside the second bearing of the power generation unit. The other connector of the wire is connected to a nano-silver wire conductive film to power the bionic fish gill unit. Multiple bionic fish gill units can be set and connected to the power generation unit through wires. The wires are common enameled wires.

[0071] In use, the power generation unit is connected to the water supply pipe through a connecting pipe, allowing water to flow through the turbine pipe 2. The bionic fish gill unit is placed in a water tank used for agricultural production and aquaculture. The water flow drives the turbine pipe 2 to rotate. During the rotation of the turbine pipe 2, the first magnet drives the second magnet, thereby causing the outer frame pipe 3 to rotate. The friction material on the inner side wall of the outer frame pipe 3 rubs against the friction power generation electrode 11 to generate electricity. The generated electricity is supplied to the bionic fish gill unit, which removes heavy metal ions and tetracycline from the water through electro-adsorption and electro-oxidation.

Claims

1. A biomimetic fish gill-based agricultural water purification device that generates electricity through friction and is self-powered, characterized in that... It includes a power generation unit for triboelectric power generation and a biomimetic fish gill unit for water purification, wherein the power generation unit is used to supply power to the biomimetic fish gill unit; The power generation unit includes: A connecting tube is a cylindrical structure with openings at both ends, and a triboelectric electrode is provided on the outer wall of the connecting tube. A turbine tube is fitted inside the connecting pipe, and turbine blades that can be driven to rotate by water flow are provided inside the turbine tube; a first magnet is provided on the turbine tube. An outer frame tube is fitted over the connecting tube, and a second magnet is provided on the outer frame tube; during the rotation of the turbine tube, the first magnet drives the second magnet, thereby causing the outer frame tube to rotate; the inner sidewall of the outer frame tube is provided with a friction material that generates electricity by rubbing against the triboelectric electrode during the rotation of the outer frame tube. The biomimetic gill unit includes: An anode layer, a cathode conductive film, and an insulating layer located between the anode layer and the cathode conductive film; The cathode conductive film has outwardly protruding gill filaments that serve as cathodes. Each gill filament includes an internal support pillar and a carbon nanotube layer modified on the support pillar.

2. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 1, characterized in that, The connecting pipe is equipped with a support frame; the power generation unit also includes a central shaft; The turbine tube has a central shaft hole, through which the central shaft passes and is fixedly connected to the turbine tube; The central shaft is rotatably connected to the support frame via a first bearing. The outer ring of the first bearing is fixed to the support frame, and the inner ring is fixed to the central shaft.

3. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 1, characterized in that, The outer frame tube is rotatably connected to the connecting tube via the second bearing. The outer frame tube is fixed to the outer ring of the second bearing, and the connecting tube is fixed to the inner ring of the second bearing.

4. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 1, characterized in that, The outer wall of the turbine tube is provided with multiple first magnets arranged at intervals along the circumference; the outer wall of the outer frame tube is provided with multiple second magnets arranged at intervals along the circumference.

5. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 4, characterized in that, Each of the first and second magnets is elongated; The outer sidewall of the turbine tube is provided with a first mounting groove for mounting the first magnet. Each first magnet is mounted in a first mounting groove, and the first magnet is arranged along the axial direction of the turbine tube. The outer wall of the outer frame tube is provided with a second mounting groove for installing the second magnet. Each second magnet is installed in a second mounting groove, and the second magnet is arranged along the axial direction of the outer frame tube.

6. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 1, characterized in that, The friction material is animal fur.

7. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 6, characterized in that, The friction material is rabbit hair or wool.

8. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 6, characterized in that, The distance between the outer wall of the connecting tube and the inner wall of the outer frame tube is 5.9~10.9mm; the length of the friction material is greater than this distance.

9. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 1, characterized in that, The outer wall of the connecting tube is provided with a plurality of triboelectric electrodes evenly arranged in the circumferential direction, and each triboelectric electrode extends along the axial direction of the connecting tube. The inner wall of the outer frame tube is provided with several friction material strips evenly arranged in the circumferential direction. Each friction material strip extends along the axial direction of the outer frame tube and is formed by the aggregation of friction materials.

10. The biomimetic fish gill agricultural water purification device with self-powered triboelectric generation according to claim 1, characterized in that, In the biomimetic gill unit, the anode layer is a titanium plate, the cathode conductive film is a nano-silver wire conductive film, and the insulating layer is a polyethylene sponge. The support pillars inside the gill filaments are made of foamed silicone.

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