A frictional power generation self-powered bionic fish gill agricultural water purification device and a use method thereof

Abstract

The application discloses a friction power generation self-powered bionic fish gill agricultural water body purification device and a use method thereof, and relates to the technical field of agricultural water body purification.The method does not need an external power supply, and realizes self-power supply by completely relying on a friction power generation technology, so that operation cost is reduced.Meanwhile, natural power is utilized for power generation, and pollution to the environment is reduced.Compared with a traditional purification method mainly based on chemical treatment and biological treatment, the bionic fish gill agricultural water body purification unit improves the water quality purification efficiency by double purification technologies of water electrolysis and biological filtration.Meanwhile, human cost is reduced, and the problem of secondary pollution does not need to be worried about, so that stable and efficient work can be achieved, and the bionic fish gill agricultural water body purification unit is not limited by environmental conditions.The application overcomes the removal difficulty of trace heavy metal ions and tetracycline in water bodies, and efficiently removes the trace heavy metal ions and tetracycline by the synergistic effect of electric adsorption and electric oxidation.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural water purification, and in particular to a triboelectric self-powered bionic fish gill agricultural water purification device and a method for using the device. Background Art

[0002] Currently, agricultural water pollution primarily manifests itself in heavy metal ion and tetracycline contamination. Heavy metal ions such as lead, mercury, and cadmium, due to their high toxicity and resistance to degradation, have become a major source of water pollution. Tetracycline, an antibiotic widely used in animal husbandry, is also overused, leading to antibiotic residues in water, further exacerbating water pollution.

[0003] These pollutants not only directly harm aquatic life but are also transmitted through the food chain, ultimately affecting human health. Furthermore, the accumulation of heavy metal ions and tetracyclines leads to eutrophication of water bodies, triggering excessive algae growth, which in turn consumes oxygen in the water, creating an oxygen-deficient environment and leading to the mass mortality of fish and other aquatic life, further disrupting the ecological balance of the waters.

[0004] Traditional agricultural water purification methods mainly include chemical treatment and biological treatment. Chemical treatment methods precipitate or oxidize pollutants by adding chemical reagents such as flocculants and oxidants. Although they can significantly reduce the concentration of pollutants in a short period of time, their high cost and potential secondary pollution problems limit their application. Biological treatment methods utilize the degradation ability of microorganisms to achieve the degradation of pollutants by constructing artificial wetlands or biological filters. However, biological treatment methods require a long treatment cycle and a large floor area, and are greatly affected by environmental conditions, making it difficult to achieve efficient and stable purification effects.

[0005] Furthermore, traditional purification methods often suffer from high energy consumption and complex operations, which not only increase purification costs but also place an additional burden on the environment. Therefore, the development of a self-powered, efficient, and low-cost agricultural water purification device is of vital practical significance. This device not only effectively removes heavy metal ions and tetracycline from water but also achieves self-power through energy recovery technology, significantly reducing operating costs and improving purification efficiency, providing a new technological path for the sustainable purification of agricultural water bodies.

[0006] The rapid rise of triboelectric nanogenerators (TENGs) has fostered the concept of self-powered designs in agricultural environments. Currently, the most commonly used triboelectric layer materials are polymers, particularly those with excellent flexibility and strong electron-donating properties, including polytetrafluoroethylene (PTFE), polydimethylsiloxane (PDMS), and polyimide (PI). These materials can be used to develop blue energy, in-vivo health monitoring devices, and battery-free environmental monitoring devices. Consequently, numerous reports have been published on the use of TENGs for energy harvesting and environmental sensing.

[0007] Triboelectric self-powered generators utilize water flow in agricultural production environments, such as the flow within irrigation pipes. Because the friction layer cannot come into contact with water, the drive and friction components of the generator are separated. The drive component uses turbine blades to follow the water flow. Magnets are mounted on the outer frame of the impeller and the outer frame of the friction layer, driving the friction layer through magnetic coupling to achieve triboelectric power generation.

[0008] Electrosorption, also known as capacitive deionization (CDI), is a novel water treatment technology that utilizes the adsorption of ions and charged particles in water by charged electrode surfaces, enriching and concentrating dissolved salts and other charged species on the electrode surface, thereby purifying / desalinating the water. Electrooxidation, the oxidative degradation or conversion of pollutants at the anode electrode under the influence of an applied electric field, has become a common water treatment technology due to its mild reaction conditions, low substrate selectivity, lack of the need for additional chemicals, modular assembly, and ease of scalable commercial application. The synergistic effect of these two technologies can significantly improve the effectiveness and efficiency of water treatment.

[0009] Currently, commercial agricultural water purification devices are the primary means of improving water quality in agricultural production. These devices primarily operate through three steps: physical filtration, chemical treatment, and biological treatment. Activated carbon is used to adsorb heavy metal ions and tetracycline from the water, but this has limited effectiveness. Furthermore, these devices are bulky, inefficient, and energy-constrained, limiting their application. Therefore, the development of self-powered, efficient, and low-cost agricultural water purification devices is imperative. Summary of the Invention

[0010] To address the problems mentioned above, the present invention provides a triboelectric, self-powered bionic fish gill agricultural water purification device and its use method. This device utilizes water flow to generate triboelectric power and supplies this energy to a fish gill agricultural water purification unit, which removes heavy metal ions and tetracycline from the water through electrosorption and electrooxidation. This method can be used in everyday agricultural production environments, exhibiting excellent adsorption efficiency and long-term stable operation.

[0011] The present invention provides a triboelectric self-powered bionic fish gill agricultural water purification device, comprising a power generation unit for triboelectric power generation and a bionic fish gill unit for water purification, wherein the power generation unit is used to supply power to the bionic fish gill unit;

[0012] The power generation unit comprises:

[0013] The connecting tube is a circular tubular structure with two ends open, and a triboelectric generating electrode is provided on the outer wall of the connecting tube;

[0014] A turbine tube is sleeved in the connecting tube, wherein turbine blades that can be driven to rotate by water flow are provided in the turbine tube; a first magnet is provided on the turbine tube;

[0015] an outer frame tube sleeved outside the connecting tube, the outer frame tube being provided with a second magnet; during the rotation of the turbine tube, the first magnet drives the second magnet, thereby causing the outer frame tube to rotate; an inner sidewall of the outer frame tube being provided with a friction material that generates electricity by friction with the friction-generating electrode during the rotation of the outer frame tube;

[0016] The bionic fish gill unit comprises:

[0017] an anode layer, a cathode conductive film, and an insulating layer located between the anode layer and the cathode conductive film;

[0018] The cathode conductive film is equipped with outward-protruding gill filaments, which serve as the cathode. Each gill filament consists of an internal support column and a carbon nanotube layer decorated on the support column. The decorative material is carbon nanotubes. Carbon nanotubes and their derivatives have excellent adsorption properties, enhancing enrichment, accelerating the electrocatalytic process, and improving pollutant removal kinetics.

[0019] In some embodiments of the present invention, a support frame is provided on the connecting pipe; the power generation unit further comprises a central axis;

[0020] The turbine tube has a central axis hole, and the central axis passes through the central axis hole and is fixedly connected to the turbine tube;

[0021] 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.

[0022] In some embodiments of the present invention, 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.

[0023] In some embodiments of the present invention, a plurality of first magnets spaced apart along the circumferential direction are provided on the outer wall of the turbine tube; and a plurality of second magnets spaced apart along the circumferential direction are provided on the outer wall of the outer frame tube.

[0024] Furthermore, each of the first magnet and the second magnet is in the shape of a long strip;

[0025] The outer wall of the turbine tube is provided with a first mounting groove for mounting the first magnet, each first magnet is mounted in one first mounting groove, and the first magnets are arranged along the axial direction of the turbine tube;

[0026] A second mounting groove for mounting the second magnet is provided on the outer side wall of the outer frame tube. Each second magnet is mounted in a second mounting groove, and the second magnets are arranged along the axial direction of the outer frame tube.

[0027] The friction material should preferably be made from animal fur with excellent friction properties, such as rabbit hair or wool. Rabbit hair fibers are fine and soft, with abundant scales on their surface, which helps increase friction. The softness of rabbit hair also creates a larger contact area when in contact with other materials, thereby improving the efficiency of charge generation.

[0028] The friction materials used for friction must be of equal length, trimmed and arranged neatly.

[0029] Preferably, the distance between the outer wall of the connecting tube and the inner wall of the outer frame tube is 5.9 to 10.9 cm; 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, as this will cause excessive compression of the friction material and result in poor power generation. It should also not be too large, as this will weaken the magnetic coupling effect between the magnets and be insufficient to drive the outer frame tube to rotate and generate electricity.

[0030] Further 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.

[0031] In some embodiments of the present invention, a plurality of friction power generation electrodes uniformly arranged along the circumferential direction are provided on the outer side wall of the connecting tube, and each friction power generation electrode is arranged along the axial direction of the connecting tube; a plurality of friction material belts uniformly arranged along the circumferential direction are provided on the inner side wall of the outer frame tube, and each friction material belt is arranged along the axial direction of the outer frame tube, and each friction material belt is formed by the aggregation of the friction material.

[0032] In some embodiments of the present invention, triboelectric electrodes can be copper electrodes, for example, and are completely covered with polytetrafluoroethylene (PTFE). The outer wall of the connecting tube is uniformly spaced circumferentially, with a gap of 4-7 mm between the electrodes. Each copper electrode has a uniform width, matching the width of the friction material strip, and is evenly distributed across the inner surface of the outer frame tube. As an example, six evenly spaced copper electrodes can be applied to the outer wall of the connecting tube, connecting non-adjacent sections. The copper electrodes in the friction section are then completely covered with PTFE. Three equally spaced strips of rabbit hair, the same width as the copper electrodes, are applied to the inner wall of the rotating outer frame tube.

[0033] In some embodiments of the present invention, in the bionic fish gill unit, the anode layer is a titanium plate, the cathode conductive film is a nanosilver wire conductive film, and the insulating layer is a polyethylene sponge;

[0034] The supporting columns inside the gill filaments are made of foamed silica gel.

[0035] The material used as the cathode substrate has a great influence on the efficiency and sustainability of electroadsorption and electrooxidation. Foamed silica gel is usually selected because it has good electrical properties and is conductive after being modified with carbon nanotubes. In addition, the material is non-toxic and non-corrosive, has good stability, will not degrade and pollute the water environment, and is water-resistant and can exist stably in the water environment, allowing electroadsorption and electrooxidation to proceed stably for a long time.

[0036] The preparation method of the gill filaments is:

[0037] (1) A certain amount of raw carbon nanotubes were first dispersed in DI-H2O (deionized water) for 15 minutes by probe ultrasonication, and sodium dodecylbenzenesulfonate (SDBS) was used as a surfactant to improve its solubility to prepare carbon nanotube ink (in a typical preparation, 0.3 mg mL -1 CNTs and 2 mg mL -1 SDBS).

[0038] (2) A gill-like pattern was made from a foamed silica gel with good electrical properties and water resistance. This was then immersed in the carbon nanotube ink and dried at 120°C for 30 minutes. The carbon nanotube loading was determined by the difference in mass 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.

[0039] (3) The prepared carbon nanotube foamed silica gel was heated to 4 mol L -1 The samples were treated with HNO3 solution for 6 h to remove excess SDBS surfactant.

[0040] The present invention also provides a triboelectric self-powered bionic fish gill agricultural water purification method, using the triboelectric self-powered bionic fish gill agricultural water purification device, the power generation unit is installed in a water pipeline, specifically, it can be connected between water pipelines through a PVC reducer, and the bionic fish gill unit is placed in a water tank used for agricultural production and breeding;

[0041] The turbine tube is driven to rotate by water flow. During the rotation of the turbine tube, the first magnet drives the second magnet, thereby rotating the outer frame tube. The friction material on the inner wall of the outer frame tube rubs against the friction power generation electrode to generate electricity. The generated electricity is supplied to the bionic fish gill unit, and heavy metal ions and tetracycline in the water are removed through electrical adsorption and electrical oxidation.

[0042] The bionic fish gill unit mainly removes heavy metal ions from the water through electroadsorption, while it can remove organic pollutants such as tetracycline from the water through electrooxidation.

[0043] Beneficial effects of the present invention:

[0044] (1) This invention proposes a triboelectric self-powered bionic fish gill agricultural water purification method. This method does not require an external power source and relies entirely on triboelectric technology to achieve self-power, thus reducing operating costs. Furthermore, it utilizes natural forces to generate electricity, thereby reducing environmental pollution.

[0045] (2) Compared with traditional purification methods based on chemical and biological treatment, the bionic fish gill agricultural water purification unit improves the efficiency of water purification through the dual purification technology of water electrolysis and biological filtration. At the same time, it reduces labor costs, does not need to worry about secondary pollution, and can achieve stable and efficient operation without being restricted by environmental conditions.

[0046] (3) In the field of sewage treatment, the removal of low-concentration heavy metal ions and tetracycline has always been a challenge. The present invention overcomes the difficulty of removing trace amounts of heavy metal ions and tetracycline in water, and efficiently removes them through the synergistic effect of electroadsorption and electrooxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a diagram of a power generation unit of the present invention;

[0048] Figure 2 It is a front view of the power generation unit of the present invention;

[0049] Figure 3 for Figure 2 AA cutting diagram in;

[0050] Figure 4 It is a diagram of the turbine tube and the central axis;

[0051] Figure 5This is the front view of the turbine tube and the central axis;

[0052] Figure 6 This is a diagram of a bionic fish gill unit of the present invention;

[0053] Figure 7 It is a connecting pipe diagram of the present invention;

[0054] Figure 8 This is a diagram of the outer frame tube of the present invention;

[0055] Figure 9 This is a schematic diagram of the outer frame tube of the present invention;

[0056] Figure 10 This is a comparison chart of the charge generated by different friction gaps after stabilization at the same speed;

[0057] Figure 11 This is a comparison chart of the amount of charge generated by the power generation unit at three water flow rates in the same time;

[0058] Markings in the figure: 1-connecting tube, 11-friction power generation 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 belt, 4-anode layer, 5-cathode conductive film, 51-gill filament, 511-support column, 512-carbon nanotube layer, 6-insulating layer, 7-center axis, 71-first bearing. DETAILED DESCRIPTION

[0059] Example 1

[0060] Depend on Figure 1-9 As shown, the present invention provides a triboelectric self-powered bionic fish gill agricultural water purification device, comprising a power generation unit for triboelectric power generation and a bionic fish gill unit for water purification, wherein the power generation unit is used to supply power to the bionic fish gill unit;

[0061] The power generation unit includes: a connecting tube 1, a circular tubular structure with two ends open, with a triboelectric power generation electrode 11 provided on the outer wall of the connecting tube 1; a turbine tube 2, which is sleeved within the connecting tube 1 and is provided with turbine blades 21 that can be driven by water flow; a first magnet is provided on the turbine tube 2; and an outer frame tube 3, which is sleeved outside the connecting tube 1 and is provided with a second magnet.

[0062] During the rotation of the turbine tube 2, the first magnet drives the second magnet, thereby rotating the outer frame tube 3; the inner side wall of the outer frame tube 3 is provided with a friction material that generates electricity by friction with the friction power generation electrode 11 during the rotation of the outer frame tube 3;

[0063] The bionic fish 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;

[0064] The cathode conductive film 5 is provided with outwardly protruding gill filaments 51, which serve as cathodes. Each gill filament includes an internal support column 511 and a carbon nanotube layer 512 modified on the support column 511. Carbon nanotubes are selected as the modifying material used in the present invention because carbon nanotubes and their derivatives can enhance enrichment, accelerate the electrocatalytic process, and improve the kinetics of pollutant removal through their excellent adsorption properties.

[0065] Specifically, a support frame 12 is provided on the connecting pipe 1 for fixing the central axis 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.

[0066] In the present invention, 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 .

[0067] Specifically, a plurality of first magnets spaced apart along the circumferential direction are provided on the outer wall of the turbine tube 2 ; a plurality of second magnets spaced apart along the circumferential direction are provided on the outer wall of the outer frame tube 3 .

[0068] Furthermore, each of the first magnet and the second magnet is in the shape of an elongated strip; a first mounting groove 22 for mounting the first magnet is provided on the outer wall of the turbine tube 2, and 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;

[0069] Second mounting grooves 32 for mounting the second magnets are provided on the outer side wall of the outer frame tube 3 . Each second magnet is mounted in a second mounting groove 32 , and the second magnets are arranged along the axial direction of the outer frame tube 3 .

[0070] In this invention, the friction material used must be animal fur with excellent friction properties, such as rabbit hair or wool. Rabbit hair fibers are fine and soft, and their surface is rich in scales, which helps increase friction. The softness of rabbit hair also creates a larger contact area when in contact with other materials, thereby improving the efficiency of charge generation. Furthermore, the friction material used for friction must be of equal length, trimmed, and neatly arranged.

[0071] In the present 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 to 10.9 cm; the length of the friction material is greater than this distance. In other words, 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 and result in poor power generation. It should also not be too large, as this will weaken the magnetic coupling effect between the magnets and insufficiently drive the outer frame tube to generate electricity. In performance testing of the present 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 6.9 mm.

[0072] More specifically, the outer side wall of the connecting tube 1 is provided with a plurality of friction power generation electrodes 11 evenly arranged along the circumferential direction, and each friction power generation electrode 11 is extended along the axial direction of the connecting tube 1; the inner side wall of the outer frame tube 3 is provided with a plurality of friction material belts 33 evenly arranged along the circumferential direction, and each friction material belt 33 is extended along the axial direction of the outer frame tube 3, and each friction material belt 33 is formed by the aggregation of friction materials.

[0073] In the present invention, the friction power generation electrode can be made of copper electrodes, etc., and the copper electrodes need to be completely covered with polytetrafluoroethylene (PTFE); the outer wall of the connecting tube is provided with electrodes evenly arranged along the circumference, and the gap between the electrodes can be set to 4-7mm. The width of each copper electrode is consistent and consistent with the width of the friction material belt, and is evenly distributed on the inner surface of the outer frame tube. In this embodiment, 6 copper electrodes with equal spacing can be evenly attached to the outer wall of the connecting tube along the circumference, and non-adjacent parts are connected, and then the copper electrodes of the friction part are completely covered with PTFE. On the inner wall of the rotating outer frame tube, 3 rabbit hairs ( Figure 7 and Figure 8 ).

[0074] The basic principle of the bionic fish gill unit is to use electrochemical principles to adsorb positively charged heavy metal ions onto the cathode, where they are then decomposed and removed through electrooxidation. Therefore, the unit's anode layer 4 utilizes a titanium plate with excellent electrical properties. This titanium plate is placed at the end of the bionic fish gill unit, and a highly permeable polyethylene sponge is used as an insulating medium to separate the anode and cathode. The cathode comprises a cathode conductive film 5, made of nanosilver wire, and gill filaments 51. The support columns 511 within the gill filaments 51 are made of foamed silicone.

[0075] The material used as the cathode substrate has a great influence on the efficiency and sustainability of electroadsorption and electrooxidation. Foamed silica gel is usually selected because it has good electrical properties and is conductive after being modified with carbon nanotubes. In addition, the material is non-toxic and non-corrosive, has good stability, will not degrade and pollute the water environment, and is water-resistant and can exist stably in the water environment, allowing electroadsorption and electrooxidation to proceed stably for a long time.

[0076] The preparation method of gill filaments is as follows:

[0077] (1) A certain amount of raw carbon nanotubes were first dispersed in DI-H2O (deionized water) for 15 minutes by probe ultrasonication, and sodium dodecylbenzenesulfonate (SDBS) was used as a surfactant to improve its solubility to prepare carbon nanotube ink (in a typical preparation, 0.3 mg mL -1 CNTs and 2 mg mL -1 SDBS).

[0078] (2) A gill-like pattern was made from a foamed silica gel with good electrical properties and water resistance. This was then immersed in the carbon nanotube ink and dried at 120°C for 30 minutes. The carbon nanotube loading was determined by the difference in mass 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.

[0079] (3) The prepared carbon nanotube foamed silica gel was heated to 4 mol L -1 The samples were treated with HNO3 solution for 6 h to remove excess SDBS surfactant.

[0080] Finally, glue them one by one on the thin cathode conductive film (arrange them neatly), and combine them with the above-mentioned titanium plate and polyethylene sponge to form the main body of the bionic fish gill agricultural water purification unit. Figure 6 shown.

[0081] The power generation unit of the present invention is used to supply power to the bionic fish gill unit. The copper electrode of the power generation unit is 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 the nano silver wire conductive film to supply power to the bionic fish gill unit. Multiple bionic fish gill units can be provided and connected to the power generation unit through a wire. The wire is a common enameled wire.

[0082] When the present invention is in use, the turbine tube 2 is driven to rotate by the water flow. During the rotation of the turbine tube 2, the first magnet drives the second magnet, thereby rotating the outer frame tube 3. The friction material on the inner wall of the outer frame tube 3 rubs against the friction power generation electrode 11 to generate electricity. The generated electricity is supplied to the bionic fish gill unit, and heavy metal ions and tetracycline in the water are removed through electrical adsorption and electrical oxidation.

[0083] Example 2

[0084] The present invention also provides a triboelectric self-powered bionic fish gill agricultural water purification method, using the triboelectric self-powered bionic fish gill agricultural water purification device of Example 1, connecting the connecting pipe of the power generation unit to the water pipeline through a PVC reducing adapter pipe, allowing the water flow in the water pipeline to pass through the turbine pipe, and placing the bionic fish gill unit in a water tank used for agricultural production and breeding;

[0085] The turbine tube is driven to rotate by water flow. During the rotation of the turbine tube, the first magnet drives the second magnet, thereby rotating the outer frame tube. The friction material on the inner wall of the outer frame tube rubs against the triboelectric electrode to generate electricity. The generated electricity is supplied to the bionic fish gill unit, and heavy metal ions and tetracycline in the water are removed through electrical adsorption and electrical oxidation.

[0086] Example 3

[0087] The friction gap between the electrode and the rabbit hair in the self-powered power generation unit of triboelectric power generation is an important factor affecting the power generation effect. According to the actual situation, 6 parameters of 5.9mm, 6.9mm, 7.9mm, 8.9mm, 9.9mm and 10.9mm were selected for testing at a fixed speed of 80RPM. The amount of charge generated after the comparison was stable, as shown in the figure below. Figure 10 As shown in the figure, the voltage required by the purification unit is not large, and the most suitable friction gap is selected based on the magnetic coupling effect between the magnets and the size of the thin-walled bearing: 6.9mm.

[0088] The triboelectric self-powered power generation unit was connected to a water pipe to test the triboelectric power generation effect at different water flow rates. The amount of charge generated in 10 minutes at low, medium and high flow rates corresponding to rotation speeds of 60 RPM, 80 RPM and 100 RPM was tested. Figure 11 shown.

[0089] These results indicate that the output of the triboelectric nanogenerator (TGN) in a self-powered power generation unit varies significantly under different friction gaps and water flow rates. Therefore, different water flow rates and friction gaps can be selected for power generation based on actual needs.

Claims

1. A triboelectric self-powered bionic fish gill agricultural water purification device, characterized in that: It comprises a power generation unit for frictional power generation and a bionic fish gill unit for water purification, wherein the power generation unit is used to supply power to the bionic fish gill unit; The power generation unit comprises: The connecting tube is a circular tubular structure with two ends open. The outer wall of the connecting tube is provided with a plurality of triboelectric generating electrodes evenly arranged along the circumference, and each triboelectric generating electrode is arranged to extend along the axial direction of the connecting tube; a turbine tube, sleeved in the connecting tube, wherein turbine blades driven to rotate by water flow are arranged in the turbine tube; and a first magnet is arranged on the turbine tube; an outer frame tube sleeved outside the connecting tube, the outer frame tube being provided with a second magnet; during the rotation of the turbine tube, the first magnet drives the second magnet, thereby causing the outer frame tube to rotate; an inner sidewall of the outer frame tube being provided with a friction material that generates electricity by friction with the friction-generating electrode during the rotation of the outer frame tube; A plurality of friction material strips are uniformly arranged along the circumferential direction on the inner side wall of the outer frame tube, each friction material strip extends along the axial direction of the outer frame tube, and each friction material strip is formed by the aggregation of the friction material; The bionic fish 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 outwardly protruding gill filaments serving as cathodes, each gill filament comprising an internal support column and a carbon nanotube layer modified on the support column; In the bionic fish gill unit, the anode layer is a titanium plate, the cathode conductive film is a nano silver wire conductive film, the insulating layer is a polyethylene sponge; and the supporting columns inside the gill filaments are foamed silica gel.

2. The triboelectric self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: The connecting pipe is provided with a support frame; the power generation unit also includes a central axis; The turbine tube has a central axis hole, and the central axis passes through the central axis hole 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 triboelectric self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: 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.

4. The triboelectric self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: A plurality of first magnets spaced apart along the circumferential direction are provided on the outer wall of the turbine tube; a plurality of second magnets spaced apart along the circumferential direction are provided on the outer wall of the outer frame tube.

5. The triboelectric self-powered bionic fish gill agricultural water purification device according to claim 4 is characterized in that: Each of the first and second magnets is in the shape of a long bar; The outer wall of the turbine tube is provided with a first mounting groove for mounting the first magnet, each first magnet is mounted in one first mounting groove, and the first magnets are arranged along the axial direction of the turbine tube; A second mounting groove for mounting the second magnet is provided on the outer side wall of the outer frame tube. Each second magnet is mounted in a second mounting groove, and the second magnets are arranged along the axial direction of the outer frame tube.

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

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

8. The triboelectric self-powered bionic fish gill agricultural water purification device according to claim 6 is characterized in that: The distance between the outer side wall of the connecting tube and the inner side wall of the outer frame tube is 5.9-10.9 cm; the length of the friction material is greater than the distance.

9. A triboelectric self-powered bionic fish gill agricultural water purification method, characterized in that: Use the triboelectric self-powered bionic fish gill agricultural water purification device according to any one of claims 1 to 8, install the power generation unit in a water pipeline, and place the bionic fish gill unit in a water tank used for agricultural production and breeding; The turbine tube is driven to rotate by water flow. During the rotation of the turbine tube, the first magnet drives the second magnet, thereby rotating the outer frame tube. The friction material on the inner wall of the outer frame tube rubs against the friction power generation electrode to generate electricity. The generated electricity is supplied to the bionic fish gill unit, and heavy metal ions and tetracycline in the water are removed through electrical adsorption and electrical oxidation.

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