Friction power generation self-powered bionic gill agricultural water purification device and use method thereof

Abstract

The invention discloses a bionic gill agricultural water purification device with friction power generation and self energy supply and a use method thereof, and relates to the technical field of agricultural water purification. According to the method, an external power supply is not needed, self-energy-supply is achieved completely through the friction power generation technology, and the operation cost is reduced. Meanwhile, the natural force is used for generating power, and pollution to the environment is reduced. Compared with a traditional purification method mainly adopting chemical treatment and biological treatment, the bionic gill agricultural water purification unit improves the water purification efficiency through a water electrolysis and biological filtration dual purification technology. Meanwhile, the labor cost is reduced, the problem of secondary pollution does not need to be worried about, and stable and efficient work can be achieved and is not limited by environmental conditions. According to the method, the difficulty in removing trace heavy metal ions and tetracycline in water is overcome, and the trace heavy metal ions and tetracycline are efficiently removed through the synergistic effect of electro-adsorption and electro-oxidation.

Description

Technical Field

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

[0002] With the growth of the global population and the continuous expansion of agricultural production, the pollution of agricultural water bodies is becoming increasingly serious. This problem not only threatens the health of aquatic ecosystems, but also poses a major challenge to the sustainability of agricultural production. At present, the pollution of agricultural water bodies is mainly manifested in heavy metal ions and tetracycline pollution in water bodies. Heavy metal ions such as lead, mercury, and cadmium have become one of the main sources of water pollution due to their strong toxicity and difficulty in degradation. Tetracycline is an antibiotic widely used in animal husbandry. Its excessive use leads to antibiotic residues in water bodies, further aggravating the degree of water pollution.

[0003] These pollutants not only directly harm aquatic life, but also pass through the food chain, ultimately affecting human health. In addition, the accumulation of heavy metal ions and tetracyclines leads to eutrophication of water bodies, causing excessive growth of algae, which in turn consumes oxygen in the water, forming an oxygen-deficient environment, leading to the mass death of fish and other aquatic life, and further destroying the ecological balance of the water body.

[0004] Traditional agricultural water purification methods mainly include chemical treatment and biological treatment. Chemical treatment methods add chemical reagents such as flocculants and oxidants to precipitate or oxidize pollutants. 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 use the degradation ability of microorganisms to achieve the degradation of pollutants by constructing artificial wetlands or biofilters. However, biological treatment methods require a long treatment cycle and a large footprint, and are greatly affected by environmental conditions, making it difficult to achieve efficient and stable purification effects.

[0005] In addition, traditional purification methods generally have problems such as high energy consumption and complex operation, which not only increases the purification cost, but also creates an additional burden on the environment. Therefore, it is of great practical significance to develop a self-powered, efficient and low-cost agricultural water purification device. This device can not only effectively remove heavy metal ions and tetracyclines in water, but also achieve self-power through energy recovery technology, thereby significantly reducing operating costs and improving purification efficiency, providing a new technical path for the sustainable purification of agricultural water bodies.

[0006] The rapid rise of triboelectric nanogenerators (TENGs) has promoted the emergence of self-powered design concepts in agricultural environments. Currently, the commonly used triboelectric layer materials are mainly polymers, especially some polymers with good flexibility and strong electron-donating ability, including polytetrafluoroethylene (PTFE), polydimethylsiloxane (PDMS), polyimide (PI), etc., which can be used to develop blue energy, in vivo health monitoring devices, battery-free environmental monitoring devices, etc. Therefore, there are a large number of reports based on triboelectric nanogenerators for energy harvesting and environmental sensing.

[0007] The self-powered power generation device of friction power generation uses the water flow in the agricultural production environment for driving, such as the water flow in the water pipe in agricultural irrigation. Due to the characteristic that the friction layer cannot contact water, the driving part and the friction part of the power generation device must be separated. The driving part uses turbine blades to rotate in accordance with the water flow. At the same time, magnets are installed on the outer frame of the impeller and the outer frame of the friction layer, and magnetic coupling is used to drive the friction layer to rotate, so as to achieve the effect of friction power generation.

[0008] Electrosorption, also known as CDI (capacitive deionization technology), is a new water treatment technology that uses the phenomenon of charged electrode surfaces adsorbing ions and charged particles in water to enrich and concentrate dissolved salts and other charged substances in water on the surface of the electrode to achieve water purification / desalination. Electro-oxidation is the oxidation degradation or conversion process of pollutants at the anode electrode under the presence of external electricity. It has the advantages of mild reaction conditions, low substrate selectivity, no need to add additional chemicals, modular assembly, and easy large-scale commercial application. It has become one of the common water treatment technologies. The synergistic effect of the two can greatly improve the effect and efficiency of water treatment.

[0009] At present, commercial agricultural water purification devices are the main means to improve water quality in agricultural production. Their working principle is mainly divided into three steps: physical filtration, chemical treatment and biological treatment. The activated carbon is used to adsorb heavy metal ions and tetracycline in the water, but the effect is minimal. In addition, these devices are large in size, low in efficiency, and energy supply issues limit their application scenarios. Therefore, it is imperative to develop self-powered, efficient and low-cost agricultural water purification devices for agricultural water purification. Summary of the invention

[0010] In order to solve the problems existing in the background technology, the present invention provides a triboelectric self-powered bionic fish gill agricultural water purification device and a method of using the same, which uses water flow drive to achieve triboelectric generation and provide electrical energy to the fish gill agricultural water purification unit, and the purification unit removes heavy metal ions and tetracycline in the water by electrical adsorption and electrical oxidation. The method can be operated in a daily agricultural production environment, has a good adsorption effect and can maintain stable operation for a long time.

[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 openings at both ends, and a friction power generation electrode is provided on the outer wall of the connecting tube;

[0014] A turbine tube is sleeved in the connecting tube, and a turbine blade that can be driven to rotate by water flow is arranged in the turbine tube; a first magnet is arranged on the turbine tube;

[0015] An outer frame tube is sleeved outside 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 rotating the outer frame tube; the inner side wall of the outer frame tube is provided with a friction material that generates electricity by friction with the friction power generation 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 provided with gill filaments protruding outwards and serving as cathodes, and each gill filament includes an internal support column and a carbon nanotube layer modified on the support column. The modification material is carbon nanotubes, which can enhance enrichment, accelerate the electrocatalytic process and improve the kinetics of pollutant removal through excellent adsorption performance.

[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 an outer ring of the second bearing, and the connecting tube is fixed to an 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 disposed on the outer wall of the turbine tube; and a plurality of second magnets spaced apart along the circumferential direction are disposed 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] A first mounting groove for mounting the first magnet is provided on the outer side wall of the turbine tube, each of the first magnets 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 of the second magnets is mounted in a second mounting groove, and the second magnets are arranged along the axial direction of the outer frame tube.

[0027] Preferably, the friction material must be selected from animal fur with good friction performance, such as rabbit hair, wool, etc. Rabbit hair fibers are fine and soft, and the surface has abundant hair scales, which helps to increase friction. The softness of rabbit hair also enables it to generate a larger contact area when in contact with other materials, thereby improving the efficiency of charge generation.

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

[0029] Preferably, the distance between the outer wall of the connecting tube and the inner wall of the outer frame tube is 5.9-10.9 cm; the length of the friction material is greater than the distance. The distance between the outer wall of the connecting tube and the inner wall of the outer frame tube cannot be too small, otherwise the friction material will be over-extruded, resulting in poor power generation effect; the distance should not be too large, otherwise the magnetic coupling effect between the magnets will be weak, which is not enough to drive the outer frame tube to rotate and generate electricity.

[0030] Further preferably, the distance between the outer wall of the connecting tube and the inner 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 to extend 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 to extend along the axial direction of the outer frame tube, and each friction material belt is formed by the aggregation of the friction materials.

[0032] In some embodiments of the present invention, the friction power generation electrode can be a copper electrode, etc., and the copper electrode needs to be completely covered with polytetrafluoroethylene (PTFE); the outer wall of the connecting tube is 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. As an example in the embodiment of the present invention, 6 copper electrodes with equal spacing can be evenly attached along the circumference on the outer wall of the connecting tube, and the 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 with the same width as the copper electrodes are evenly attached.

[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 nano silver 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 electrosorption and electro-oxidation. Foamed silica gel is usually used because it has good electrical properties and is conductive after being modified by carbon nanotubes. 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 electrosorption and electro-oxidation to proceed stably for a long time.

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

[0037] (1) A certain amount of original carbon nanotubes was dispersed in DI-H by probe ultrasound for 15 minutes. 2 Carbon nanotube inks were prepared by immersing carbon nanotubes in deionized water (DO) for 15 min with sodium dodecylbenzene sulfonate (SDBS) as a surfactant to improve their solubility (in a typical preparation, 0.3 mg mL -1 CNTs and 2 mg mL -1 SDBS).

[0038] (2) Select foamed silica gel with good electrical properties and water resistance to make a gill-like pattern, immerse it in carbon nanotube ink, and then dry it at 120°C for 30 minutes. The carbon nanotube loading is obtained by the difference in mass before and after the foamed silica gel is immersed and dried. Repeat this dyeing process 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 HNO 3 The solution was treated for 6 h to remove excess SDBS surfactant.

[0040] The present invention also provides a friction-generated self-powered bionic fish gill agricultural water purification method, using the friction-generated 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 adapter, 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 to remove heavy metal ions and tetracycline in the water through electrical adsorption and electrical oxidation.

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

[0043] Beneficial effects of the present invention:

[0044] (1) The present invention proposes a method for agricultural water purification using bionic fish gills with frictional power generation and self-power supply, which does not require an external power supply and completely relies on frictional power generation technology to achieve self-power supply, thereby reducing operating costs. At the same time, it uses natural power to generate electricity, thereby reducing pollution to the environment.

[0045] (2) Compared with the traditional purification methods based on chemical treatment 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 the problem of secondary pollution, can achieve stable and efficient work, and is not 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 difficult problem. The present invention overcomes the difficulty of removing trace amounts of heavy metal ions and tetracycline in water, and removes them efficiently through the synergistic effect of electrosorption and electrooxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 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 the diagram of turbine tube and central axis;

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

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

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

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

[0055] Fig. 9 It is a schematic diagram of the outer frame tube of the present invention;

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

[0057] Fig.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 filaments, 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 openings at both ends, and a friction power generation electrode 11 is provided on the outer wall of the connecting tube 1; a turbine tube 2, which is sleeved in the connecting tube 1, and a turbine blade 21 which can be driven to rotate by water flow is provided in the turbine tube 2; a first magnet is provided on the turbine tube 2; an outer frame tube 3, which is sleeved outside the connecting tube 1, and a second magnet is provided on the outer frame tube 3;

[0062] 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 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 comprises: 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 gill filaments 51 protruding outwards and serving as cathodes, and each gill filament includes an internal support column 511 and a carbon nanotube layer 512 modified on the support column 511. The modified material used in the present invention is carbon nanotubes because carbon nanotubes and their derivative materials can enhance enrichment, accelerate the electrocatalytic process and improve the kinetics of pollutant removal through excellent adsorption performance.

[0065] Specifically, a support frame 12 is provided on the connecting pipe 1, which is used to fix 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 axis 7; the turbine tube 2 has a central axis hole 23, and the central axis 7 passes through the central axis hole 23 and is fixedly connected to the turbine tube 2; the central axis 7 is rotatably connected to the support frame 12 through a first bearing 71, and the outer ring of the first bearing 71 is fixed to the support frame 12, and the inner ring is fixed to the central axis 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 in the circumferential direction are provided on the outer wall of the turbine tube 2 ; a plurality of second magnets spaced apart in 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 a long strip; a first mounting groove 22 for mounting the first magnet is provided on the outer wall of the turbine tube 2, each first magnet is mounted in a first mounting groove 22, and the first magnet is 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 the present invention, the friction material used must be selected from animal fur with good friction performance, such as rabbit hair, wool, etc. Rabbit hair fibers are fine and soft, and the surface has abundant hair scales, which helps to increase friction. The softness of rabbit hair also enables it to produce a larger contact area when in contact with other materials, thereby improving the efficiency of charge generation. In addition, the friction materials 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 the 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, otherwise the friction material will be over-extruded, resulting in poor power generation effect; the distance should not be too large, otherwise the magnetic coupling effect between the magnets will be weak, which is not enough to drive the outer frame tube to rotate and generate electricity. In the performance test of the present invention, the best response to the friction power generation effect is: the distance between the outer wall of the connecting tube and the inner wall of the outer frame tube is 6.9 mm.

[0072] More specifically, the outer 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 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 it is necessary to use polytetrafluoroethylene (PTFE) to completely cover the copper electrodes; the outer wall of the connecting tube is 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 along the circumference on the outer wall of the connecting tube, 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 the electrochemical principle 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 the unit uses a titanium plate with good electrical properties. A titanium plate is placed at the end of the bionic fish gill unit, and a 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 column 511 inside the gill filament 51 is foamed silica gel.

[0075] The material used as the cathode substrate has a great influence on the efficiency and sustainability of electrosorption and electro-oxidation. Foamed silica gel is usually used because it has good electrical properties and is conductive after being modified by carbon nanotubes. 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 electrosorption and electro-oxidation to proceed stably for a long time.

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

[0077] (1) A certain amount of original carbon nanotubes was dispersed in DI-H by probe ultrasound for 15 minutes. 2 Carbon nanotube inks were prepared by immersing carbon nanotubes in deionized water (DO) for 15 min with sodium dodecylbenzene sulfonate (SDBS) as a surfactant to improve their solubility (in a typical preparation, 0.3 mg mL -1 CNTs and 2 mg mL -1 SDBS).

[0078] (2) Select foamed silica gel with good electrical properties and water resistance to make a gill-like pattern, immerse it in carbon nanotube ink, and then dry it at 120°C for 30 minutes. The carbon nanotube loading is obtained by the difference in mass before and after the foamed silica gel is immersed and dried. Repeat this dyeing process 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 HNO 3 The solution was treated for 6 h to remove excess SDBS surfactant.

[0080] Finally, they are glued one by one on a thin cathode conductive film (arranged neatly), and combined 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. A 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. A plurality of bionic fish gill units can be provided and connected to the power generation unit via 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 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 by electrical adsorption and electrical oxidation.

[0083] Example 2

[0084] The present invention also provides a friction-generated self-powered bionic fish gill agricultural water purification method, using the friction-generated self-powered bionic fish gill agricultural water purification device in 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 friction power generation electrode to generate electricity. The generated electricity is supplied to the bionic fish gill unit to remove heavy metal ions and tetracycline in the water 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 stabilization is as follows: Fig.10 As shown. Since the voltage required by the purification unit is not large, 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 friction-generated self-powered power generation unit was connected to a water pipe to test the friction-generated 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 60RPM, 80RPM and 100RPM was tested. Fig.11 shown.

[0089] The above results show that the output size of the friction nanogenerator of the friction power generation self-powered power generation unit will change significantly under different friction gaps and different water flow speeds. Therefore, different water flow speeds and friction gaps can be selected for power generation according to actual needs.

Claims

1. A friction-generated self-powered bionic fish gill agricultural water purification device, characterized in that: It comprises a power generation unit for friction 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 openings at both ends, and a friction power generation electrode is provided on the outer wall of the connecting tube; A turbine tube is sleeved in the connecting tube, and a turbine blade that can be driven to rotate by water flow is arranged in the turbine tube; a first magnet is arranged on the turbine tube; An outer frame tube is sleeved outside 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 rotating the outer frame tube; the inner side wall of the outer frame tube is provided with a friction material that generates electricity by friction with the friction power generation electrode during the rotation of the outer frame tube; 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 gill filaments protruding outwards and serving as cathodes, and each gill filament comprises an internal supporting column and a carbon nanotube layer modified on the supporting column.

2. According to claim 1, the friction-generated self-powered bionic fish gill agricultural water purification device 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 friction-generated 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 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 friction-generated self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: A plurality of first magnets spaced apart in the circumferential direction are arranged on the outer wall of the turbine tube; a plurality of second magnets spaced apart in the circumferential direction are arranged on the outer wall of the outer frame tube.

5. The friction-generated 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 strip; A first mounting groove for mounting the first magnet is provided on the outer side wall of the turbine tube, each of the first magnets 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 of the second magnets is mounted in a second mounting groove, and the second magnets are arranged along the axial direction of the outer frame tube.

6. The friction-generated self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: The friction material is animal fur; preferably, the friction material is rabbit hair or wool.

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

8. The friction-generated self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: A plurality of friction power generation electrodes are evenly arranged along the circumferential direction on the outer side wall of the connecting tube, and each friction power generation electrode is arranged to extend along the axial direction of the connecting tube; A plurality of friction material bands evenly arranged along the circumferential direction are arranged on the inner side wall of the outer frame tube, each friction material band is extended and arranged along the axial direction of the outer frame tube, and each friction material band is formed by gathering the friction material.

9. The friction-generated self-powered bionic fish gill agricultural water purification device according to claim 1 is characterized in that: In the bionic fish 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 supporting columns inside the gill filaments are made of foamed silica gel.

10. A triboelectric self-powered bionic fish gill agricultural water purification method, characterized in that: Use the friction-generated self-powered bionic fish gill agricultural water purification device as described in any one of claims 1 to 9, 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 to remove heavy metal ions and tetracycline in the water through electrical adsorption and electrical oxidation.

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