A suspension device for underwater piezoelectric photocatalysis using river hydrodynamics

Abstract

The present invention is a suspension device for underwater piezoelectric photocatalysis using river water power, and its structure includes a water inlet (2), a water outlet (3), a floating plate, and a piezoelectric column (5); the floating plate includes a left floating plate (4‑1) and a right floating plate (4‑2), the left floating plate (4‑1) and the right floating plate (4‑2) are relatively parallel, one end of the left floating plate (4‑1) and the right floating plate (4‑2) jointly form a water inlet (2), and the other end of the left floating plate (4‑1) and the right floating plate (4‑2) jointly form a water outlet (3), a first deflection device (6‑1) is installed at the water inlet (2), and a second deflection device (6‑2) is installed at the water outlet (3), and the piezoelectric column (5) is located between the water inlet (2) and the water outlet (3); the surface of the piezoelectric column (5) is coated with a photocatalytic piezoelectric film (8). The present invention achieves in-situ removal of pollutants by coupling piezoelectric effect and photocatalytic technology.

Description

Technical Field

[0001] The invention relates to a suspension device which utilizes river water power to perform underwater piezoelectric photocatalysis, and belongs to the field of water pollution control. Background Art

[0002] With the continuous development of urbanization, a large number of rivers have been artificially occupied and the evolution of natural rivers has been artificially interfered with. For example, small rivers have been straightened and rivers have been constantly dry, resulting in the shrinkage of river networks in urban areas and the degradation of water systems. In addition, riverbed mud has not been cleaned for a long time, and nutrients such as N and P, as well as harmful substances such as antibiotics are continuously released. When the water flow in the river is slow, black and smelly water bodies are easily formed, which will have a great impact on the river water environment.

[0003] Photocatalytic technology is the accelerated conversion of solar energy into chemical energy under the action of photocatalysts. It has the advantages of simple technology, mild reaction conditions, strong universality, and no secondary pollution. It can be applied to photocatalytic degradation of pollutants, photocatalytic hydrogen production, solar power generation and other fields.

[0004] Although photocatalytic technology has great application potential in energy conversion and natural environment management, the low quantum efficiency of photocatalysts and the easy recombination of photogenerated charges make it difficult to realize practical application of photocatalytic technology. Therefore, optimizing the separation pathway of carriers and constructing an excellent photocatalytic system can realize the application of photocatalytic technology in actual water bodies.

[0005] In recent years, the use of piezoelectric effect coupled with photocatalytic technology is an effective method to improve catalytic efficiency; for example, the built-in electric field generated by the semiconductor under mechanical stress can promote the separation of photogenerated carriers and effectively improve the degradation performance of the catalyst; but currently in the sewage treatment of rivers, it is difficult to effectively provide an environment for the generation of piezoelectric effect in the river, so it is difficult to couple the piezoelectric effect with photocatalytic technology for use in sewage treatment in rivers. Summary of the invention

[0006] The present invention proposes a suspension device for underwater piezoelectric photocatalysis using river hydrodynamics, which aims to solve the problem that the prior art cannot couple the piezoelectric effect with the photocatalytic technology for sewage treatment in flowing river water.

[0007] The technical solution of the present invention is: a suspension device for underwater piezoelectric photocatalysis using river hydrodynamics, whose structure includes a water inlet 2, a water outlet 3, a float, and a piezoelectric column 5; wherein the float includes a left float 4-1 and a right float 4-2, the left float 4-1 and the right float 4-2 are relatively parallelly arranged, one end of the left float 4-1 and the right float 4-2 jointly form a water inlet 2, the other end of the left float 4-1 and the right float 4-2 jointly form a water outlet 3, a first deflection device 6-1 is installed at the water inlet 2, a second deflection device 6-2 is installed at the water outlet 3, and the piezoelectric column 5 is located between the water inlet 2 and the water outlet 3; the surface of the piezoelectric column 5 is coated with a photocatalytic-piezoelectric film 8.

[0008] Furthermore, the bottom of the left floating plate 4-1 and the bottom of the right floating plate 4-2 are connected to the riverbed through a rope 1, the length directions of the left floating plate 4-1 and the right floating plate 4-2 are parallel to the water flow direction in the river channel, the water inlet 2 faces the upstream of the river channel, and the water outlet 3 faces the downstream of the river channel.

[0009] Furthermore, the first baffle device 6-1 and the second baffle device 6-2 each include several layers of baffles 6; the baffles 6 are wavy plate-shaped, one end of the baffle 6 is connected to the left floating plate 4-1, and the other end of the baffle 6 is connected to the right floating plate 4-2, the overall length direction of each layer of baffles 6 is perpendicular to the length direction of the left floating plate 4-1 and the right floating plate 4-2, the plate surface of each layer of baffles 6 is a wavy structure, and the upper and lower surfaces of each layer of baffles 6 have several wavy grooves.

[0010] Furthermore, the several layers of baffles 6 in the first baffle device 6-1 are placed in sequence from top to bottom, and the several layers of baffles 6 in the first baffle device 6-1 are parallel to each other; the several layers of baffles 6 in the second baffle device 6-2 are also placed in sequence from top to bottom, and the several layers of baffles 6 in the second baffle device 6-2 are also parallel to each other; each layer of baffles 6 is placed horizontally, and the overall length direction of each layer of baffles 6 is perpendicular to the flow direction of the overall water flow in the river channel.

[0011] Furthermore, the length direction of the wavy grooves on the upper and lower surfaces of each layer of baffles is parallel to the length direction of the left floating plate 4 - 1 and the right floating plate 4 - 2 .

[0012] Furthermore, the piezoelectric column 5 is located in an area surrounded by the water inlet 2, the water outlet 3, the left floating plate 4-1, and the right floating plate 4-2; the piezoelectric column 5 is connected and fixed to the floating plate by an elastic rope 7.

[0013] Furthermore, there are a plurality of piezoelectric columns 5, and the plurality of piezoelectric columns 5 are distributed in the area surrounded by the water inlet 2, the water outlet 3, the left float 4-1, and the right float 4-2. The plurality of piezoelectric columns 5 are connected to each other through elastic ropes 7, the piezoelectric column 5 close to the left float 4-1 is connected to the left float 4-1 through the elastic rope 7, and the piezoelectric column 5 close to the right float 4-2 is connected to the right float 4-2 through the elastic rope 7; there are a plurality of elastic ropes 7, which are respectively used for connecting different piezoelectric columns 5 and connecting the piezoelectric columns 5 and the floats.

[0014] Furthermore, the water inlet 2 and the water outlet 3 each have an upper fixed plate 10 and a lower fixed plate 11; one end of the upper fixed plate 10 and the lower fixed plate 11 are connected to the left floating plate 4-1, and the other end of the upper fixed plate 10 and the lower fixed plate 11 are connected to the right floating plate 4-2; the upper fixed plate 10 and the lower fixed plate 11 at the water inlet 2 are placed in parallel up and down, the upper fixed plate 10 at the water inlet 2 is located above the lower fixed plate 11 at the water inlet 2, and the first deflection device 6-1 is distributed between the upper fixed plate 10 and the lower fixed plate 11 at the water inlet 2; the upper fixed plate 10 and the lower fixed plate 11 at the water outlet 3 are also placed in parallel up and down, the upper fixed plate 10 at the water outlet 3 is located above the lower fixed plate 11 at the water outlet 3, and the upper fixed plate 10 at the water outlet 3 is located above the lower fixed plate 11 at the water outlet 3. A second deflection device 6-2 is distributed between the fixed plate 10 and the lower fixed plate 11; the two ends of the upper fixed plate 10 at the respective positions of the water inlet 2 and the water outlet 3 are respectively connected to the upper edges of the left floating plate 4-1 and the right floating plate 4-2, and the two ends of the lower fixed plate 11 at the respective positions of the water inlet 2 and the water outlet 3 are respectively connected to the lower edges of the left floating plate 4-1 and the right floating plate 4-2; when working, the river water flowing through the upper fixed plate 10 and the lower fixed plate 11 at the water inlet 2 flows to the area where the piezoelectric column 5 is distributed after passing through the first deflection device 6-1 at the water inlet 2, and then flows out through the second deflection device 6-2 at the water outlet 3; a reflector 9 is installed at the lower end of the piezoelectric column 5, the reflector 9 forms a certain angle with the horizontal plane, and the reflecting surface of the reflector 9 is inclined upward.

[0015] Furthermore, the preparation method of the photocatalytic-piezoelectric film 8 includes:

[0016] 1) Adding nano-piezoelectric photocatalyst to an organic solvent in which a thin film substrate is dissolved to form a mixed solution;

[0017] 2) Apply the mixed solution on the substrate;

[0018] 3) Spray deionized water on the surface of the substrate at a uniform speed;

[0019] 4) A photocatalytic-piezoelectric film with uniform pores is formed after solvent replacement.

[0020] Furthermore, the film substrate is polyvinylidene fluoride; the dissolution process of the film substrate in the organic solvent includes: blending polyvinylidene fluoride with the organic solvent and stirring until a transparent and uniform solution is formed; the nano-piezoelectric photocatalyst includes one, two or three of nano-ZnO, nano-BaTiO3, and single-layer MoS2.

[0021] Advantages of the present invention:

[0022] 1) The present invention can achieve in-situ removal of pollutants and improve the in-situ removal efficiency of pollutants by coupling piezoelectric effect and photocatalytic degradation technology;

[0023] 2) The present invention utilizes the natural energy (energy of water flow and energy of light) in the application environment of piezoelectric photocatalyst to stimulate the generation of piezoelectric effect, which has the advantages of environmental protection and energy saving compared with other high energy density methods such as ultrasound;

[0024] 3) The present invention is fixed in the river channel in a suspended form, and is easy to arrange flexibly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Attached Figure 2 It is a schematic diagram of the arrangement of the present invention in actual application in a river channel.

[0027] Attached Figure 3 It is a top view schematic diagram of the present invention.

[0028] Attached Figure 4 It is a structural schematic diagram of the medium-voltage electric column of the present invention.

[0029] In the attached drawings: 1 is a rope; 2 is a water inlet; 3 is a water outlet; 4-1 is a left floating plate; 4-2 is a right floating plate; 5 is a piezoelectric column; 6 is a deflector; 6-1 is a first deflector; 6-2 is a second deflector; 7 is an elastic rope; 8 is a photocatalytic-piezoelectric film; 9 is a reflector; 10 is an upper fixed plate; 11 is a lower fixed plate. DETAILED DESCRIPTION

[0030] A suspension device for underwater piezoelectric photocatalysis using river water power, the structure of which includes a water inlet 2, a water outlet 3, a floating plate, and a piezoelectric column 5; wherein the floating plate includes a left floating plate 4-1 and a right floating plate 4-2, the left floating plate 4-1 and the right floating plate 4-2 are relatively parallelly arranged, one end of the left floating plate 4-1 and the right floating plate 4-2 jointly form a water inlet 2, the other end of the left floating plate 4-1 and the right floating plate 4-2 jointly form a water outlet 3, a first deflection device 6-1 is installed at the water inlet 2, a second deflection device 6-2 is installed at the water outlet 3, and the piezoelectric column 5 is located between the water inlet 2 and the water outlet 3; the surface of the piezoelectric column 5 is coated with a photocatalytic-piezoelectric film 8.

[0031] The left floating plate 4-1, the right floating plate 4-2, the first deflection device 6-1, and the second deflection device 6-2 together form the overall frame of the suspension device for underwater piezoelectric photocatalysis using river hydrodynamics of the present invention; the suspension device for underwater piezoelectric photocatalysis using river hydrodynamics is preferably a hollow frame structure as a whole, and the bottom and top of the suspension device for underwater piezoelectric photocatalysis using river hydrodynamics are preferably open; when the present invention is actually used, it is preferred to connect the bottom of the left floating plate 4-1 and the bottom of the right floating plate 4-2 to the riverbed through a rope 1, so that the entire device of the present invention can be suspended in the river, and the length directions of the left floating plate 4-1 and the right floating plate 4-2 are parallel to the direction of water flow in the river, the water inlet 2 faces the upstream of the river, and the water outlet 3 faces the downstream of the river; the first deflection device 6-1 at the water inlet 2 and the second deflection device 6-2 at the water outlet 3 are arranged transversely relative to the direction of water flow in the river, so as to increase river turbulence and enhance water flow dynamics.

[0032] The floating plate is preferably made of PE material; the floating plate is used to fix the water inlet 2 and the water outlet 3 and the piezoelectric column 5, and the floating plate provides buoyancy, allowing the entire device to float back and forth in the water flow, maximizing the use of the mechanical energy of the water flow to stimulate the piezoelectric effect.

[0033] The first deflecting device 6-1 and the second deflecting device 6-2 are the same deflecting devices.

[0034] The first baffle device 6-1 and the second baffle device 6-2 each include several layers of baffles 6; the baffles 6 are wavy plate-shaped, one end of the baffle 6 is connected to the left floating plate 4-1, and the other end of the baffle 6 is connected to the right floating plate 4-2, the overall length direction of each layer of baffles 6 is perpendicular to the length direction of the left floating plate 4-1 and the right floating plate 4-2, the plate surface of each layer of baffles 6 is a wavy structure, and the upper and lower surfaces of each layer of baffles 6 have several wavy grooves.

[0035] The several layers of baffles 6 in the first baffle device 6-1 are placed in sequence from top to bottom, and the several layers of baffles 6 in the first baffle device 6-1 are parallel to each other, and the water flow generates higher intensity turbulence and vortex shear force through the baffles; the several layers of baffles 6 in the second baffle device 6-2 are also placed in sequence from top to bottom, and the several layers of baffles 6 in the second baffle device 6-2 are also parallel to each other, and the second baffle device 6-2 does not affect the fluidity of the water flow, and has a recoil effect on the water flow at the outlet; preferably, each layer of baffles 6 is placed horizontally, and the overall length direction of each layer of baffles 6 is perpendicular to the flow direction of the overall water flow in the river channel.

[0036] The length direction of the wavy grooves on the upper and lower surfaces of each layer of baffles is parallel to the length direction of the left floating plate 4-1 and the right floating plate 4-2; preferably, the wavy grooves are V-shaped grooves.

[0037] The piezoelectric column 5 is located in the area surrounded by the water inlet 2, the water outlet 3, the left floating plate 4-1, and the right floating plate 4-2; the piezoelectric column 5 is connected and fixed to the floating plate through an elastic rope 7.

[0038] There are a plurality of piezoelectric columns 5, which are distributed in the area surrounded by the water inlet 2, the water outlet 3, the left floating plate 4-1, and the right floating plate 4-2. The piezoelectric columns 5 are connected to each other through elastic ropes 7. The piezoelectric column 5 close to the left floating plate 4-1 is connected to the left floating plate 4-1 through the elastic rope 7, and the piezoelectric column 5 close to the right floating plate 4-2 is connected to the right floating plate 4-2 through the elastic rope 7. There are a plurality of elastic ropes 7, which are respectively used for different piezoelectric columns 5. The present invention can change the water flow velocity, water flow rate and water flow direction at the water inlet 2 and the water outlet 3 through the setting of the first deflection device 6-1 and the second deflection device 6-2, thereby enhancing the turbulence and vortex shear force exerted on the piezoelectric columns 5, increasing the water flow impact on the piezoelectric columns 5 in the horizontal direction and the vertical direction, enhancing the piezoelectric effect, and further promoting the photocatalytic degradation effect of the photocatalytic-piezoelectric film 8.

[0039] The water inlet 2 and the water outlet 3 each have an upper fixed plate 10 and a lower fixed plate 11; one end of the upper fixed plate 10 and the lower fixed plate 11 are connected to the left floating plate 4-1, and the other end of the upper fixed plate 10 and the lower fixed plate 11 are connected to the right floating plate 4-2; the upper fixed plate 10 and the lower fixed plate 11 at the water inlet 2 are placed in parallel up and down, the upper fixed plate 10 is located above the lower fixed plate 11, and the first deflection device 6-1 is distributed between the upper fixed plate 10 and the lower fixed plate 11 at the water inlet 2; the upper fixed plate 10 and the lower fixed plate 11 at the water outlet 3 are also placed in parallel up and down, and the upper fixed plate 10 is located above the lower fixed plate 11 A second deflection device 6-2 is distributed between the upper fixed plate 10 and the lower fixed plate 11 at the water outlet 3; the two ends of the upper fixed plate 10 at the respective positions of the water inlet 2 and the water outlet 3 are respectively connected to the upper edges of the left floating plate 4-1 and the right floating plate 4-2, and the two ends of the lower fixed plate 11 at the respective positions of the water inlet 2 and the water outlet 3 are respectively connected to the lower edges of the left floating plate 4-1 and the right floating plate 4-2; when working, the river water flowing between the upper fixed plate 10 and the lower fixed plate 11 at the water inlet 2 flows to the area where the piezoelectric columns 5 are distributed after passing through the first deflection device 6-1 at the water inlet 2, and then flows out through the second deflection device 6-2 at the water outlet 3.

[0040] The surface of the piezoelectric column 5 is coated with a photocatalytic-piezoelectric film 8, and a reflector 9 is installed at the lower end of the piezoelectric column 5, and the reflector 9 forms a certain angle with the horizontal plane; preferably, the reflective surface of the reflector 9 is inclined upward; when working, the reflector 9 can refract the light beam onto the photocatalytic-piezoelectric film 8, which is beneficial to increase the intensity of light irradiated to the surface of the photocatalytic-piezoelectric film 8. The photocatalytic-piezoelectric film 8 undergoes a photocatalytic reaction under the action of light. At the same time, the piezoelectric column 5 is affected by the vortex shear force of the water flow, which produces a piezoelectric effect, further promoting the photocatalytic degradation effect of the photocatalytic-piezoelectric film 8, which is beneficial to the photocatalytic degradation process of pollutants in the river channel by the photocatalytic-piezoelectric film 8, and under the action of the vortex shear force of the water flow and light, the efficient degradation of pollutants is achieved.

[0041] The method for preparing the photocatalytic-piezoelectric film 8 comprises the following steps:

[0042] 1) Adding nano-piezoelectric photocatalyst to an organic solvent in which a thin film substrate is dissolved to form a mixed solution;

[0043] 2) Apply the mixed solution on the substrate;

[0044] 3) Spray deionized water on the surface of the substrate at a uniform speed;

[0045] 4) A photocatalytic-piezoelectric film with uniform pores is formed after solvent replacement.

[0046] After the solvent replacement, the photocatalytic-piezoelectric film will automatically fall off from the substrate, and then the fallen photocatalytic-piezoelectric film is coated on the surface of the columnar mold to form a piezoelectric column 5 with the surface coated with the photocatalytic-piezoelectric film.

[0047] The film substrate is preferably a high molecular polymer polyvinylidene fluoride (PVDF) with piezoelectric effect; the dissolution process of the film substrate in an organic solvent includes: blending polyvinylidene fluoride (PVDF) with an organic solvent, and stirring until a transparent uniform solution is formed; preferably, blending polyvinylidene fluoride (PVDF) with an organic solvent at ≥85°C, and stirring until a transparent uniform solution is formed; further preferably, blending polyvinylidene fluoride (PVDF) with an organic solvent at 90°C, and stirring until a transparent uniform solution is formed; the organic solvent is preferably triethyl phosphate.

[0048] The nano-piezoelectric photocatalyst comprises one, two or three of nano-ZnO, nano-BaTiO3 and single-layer MoS2 with piezoelectric effect.

[0049] The deionized water is sprayed on the substrate surface by a spray pot at a uniform speed. The uniform speed spraying helps the piezoelectric film to form a uniform pore structure.

[0050] The solvent replacement is to use water to precipitate the organic solvent dissolved in the film substrate, and in this process, the porous structure of the piezoelectric film is formed.

[0051] The photocatalytic-piezoelectric film 8 of the present invention is composed of a high molecular polymer with piezoelectric effect and a nano-piezoelectric photocatalyst, and can stimulate piezoelectric potential and drive the efficient separation of carriers.

Claims

1. A suspension device for underwater piezoelectric photocatalysis using river water power, characterized in that It comprises a water inlet (2), a water outlet (3), a floating plate, and a piezoelectric column (5); wherein the floating plate comprises a left floating plate (4-1) and a right floating plate (4-2); the left floating plate (4-1) and the right floating plate (4-2) are arranged relatively parallel to each other; one end of the left floating plate (4-1) and the right floating plate (4-2) together form the water inlet (2); the other end of the left floating plate (4-1) and the right floating plate (4-2) together form the water outlet (3); a first deflection device (6-1) is installed at the water inlet (2); a second deflection device (6-2) is installed at the water outlet (3); and the piezoelectric column (5) is located between the water inlet (2) and the water outlet (3); the surface of the piezoelectric column (5) is coated with a photocatalytic-piezoelectric film (8); There are a plurality of piezoelectric columns (5), and the plurality of piezoelectric columns (5) are distributed in an area surrounded by a water inlet (2), a water outlet (3), a left floating plate (4-1), and a right floating plate (4-2). The plurality of piezoelectric columns (5) are connected to each other via elastic ropes (7). The piezoelectric column (5) close to the left floating plate (4-1) is connected to the left floating plate (4-1) via the elastic rope (7), and the piezoelectric column (5) close to the right floating plate (4-2) is connected to the right floating plate (4-2) via the elastic rope (7). There are a plurality of elastic ropes (7), which are used for connecting different piezoelectric columns (5) and connecting the piezoelectric columns (5) to the floating plate. The left floating plate (4-1), the right floating plate (4-2), the first baffle device (6-1), and the second baffle device (6-2) together form an overall frame of a suspension device for underwater piezoelectric photocatalysis using river water power; the suspension device for underwater piezoelectric photocatalysis using river water power is an overall hollow frame structure, and the bottom and top of the suspension device for underwater piezoelectric photocatalysis using river water power are both open; The bottom of the left floating plate (4-1) and the bottom of the right floating plate (4-2) are both connected to the riverbed via ropes (1); the length directions of the left floating plate (4-1) and the right floating plate (4-2) are parallel to the direction of water flow in the river channel; the water inlet (2) faces upstream of the river channel, and the water outlet (3) faces downstream of the river channel; The first baffle device (6-1) and the second baffle device (6-2) both comprise a plurality of layers of baffle plates (6); the baffle plates (6) are wavy plates, one end of the baffle plates (6) is connected to the left floating plate (4-1), and the other end of the baffle plates (6) is connected to the right floating plate (4-2); the overall length direction of each layer of baffle plates (6) is perpendicular to the length directions of the left floating plate (4-1) and the right floating plate (4-2); the plate surface of each layer of baffle plates (6) is a wavy structure; and the upper and lower surfaces of each layer of baffle plates (6) are provided with a plurality of wavy grooves; The plurality of layers of baffles (6) in the first baffle device (6-1) are arranged in sequence from top to bottom, and the plurality of layers of baffles (6) in the first baffle device (6-1) are parallel to each other; the plurality of layers of baffles (6) in the second baffle device (6-2) are also arranged in sequence from top to bottom, and the plurality of layers of baffles (6) in the second baffle device (6-2) are also parallel to each other; each layer of baffles (6) is arranged horizontally, and the overall length direction of each layer of baffles (6) is perpendicular to the flow direction of the overall water flow in the river channel; The piezoelectric column (5) is located in an area surrounded by the water inlet (2), the water outlet (3), the left floating plate (4-1), and the right floating plate (4-2); the piezoelectric column (5) is connected and fixed to the floating plate via an elastic rope (7).

2. The suspension device for underwater piezoelectric photocatalysis using river water power according to claim 1, characterized in that The length directions of the wavy grooves on the upper and lower surfaces of each layer of baffles are parallel to the length directions of the left floating plate (4-1) and the right floating plate (4-2).

3. The suspension device for underwater piezoelectric photocatalysis using river water power according to claim 1, characterized in that The water inlet (2) and the water outlet (3) each have an upper fixing plate (10) and a lower fixing plate (11); one end of the upper fixing plate (10) and the lower fixing plate (11) are connected to the left floating plate (4-1), and the other end of the upper fixing plate (10) and the lower fixing plate (11) are connected to the right floating plate (4-2); the upper fixing plate (10) and the lower fixing plate (11) at the water inlet (2) are arranged in parallel up and down; the upper fixing plate (10) and the lower fixing plate (11) at the water inlet (2) are connected to the left floating plate (4-1), and the other end of the upper fixing plate (10) and the lower fixing plate (11) are connected to the right floating plate (4-2). The fixed plate (10) is located above the lower fixed plate (11) at the water inlet (2), and a first deflection device (6-1) is distributed between the upper fixed plate (10) and the lower fixed plate (11) at the water inlet (2); the upper fixed plate (10) and the lower fixed plate (11) at the water outlet (3) are also placed in parallel up and down, the upper fixed plate (10) at the water outlet (3) is located above the lower fixed plate (11) at the water outlet (3), and the lower fixed plate (11) at the water outlet (3) is located above the lower fixed plate (11) at the water outlet (3). A second deflection device (6-2) is distributed between the upper fixed plate (10) and the lower fixed plate (11); the two ends of the upper fixed plate (10) at the respective positions of the water inlet (2) and the water outlet (3) are respectively connected to the upper edges of the left floating plate (4-1) and the right floating plate (4-2); and the two ends of the lower fixed plate (11) at the respective positions of the water inlet (2) and the water outlet (3) are respectively connected to the lower edges of the left floating plate (4-1) and the right floating plate (4-2). When in operation, river water flowing between the upper fixed plate (10) and the lower fixed plate (11) at the water inlet (2) flows through the first deflection device (6-1) at the water inlet (2) to the area where the piezoelectric columns (5) are distributed, and then flows out through the second deflection device (6-2) at the water outlet (3); a reflector (9) is installed at the lower end of the piezoelectric column (5), the reflector (9) forms a certain angle with the horizontal plane, and the reflective surface of the reflector (9) is inclined upward.

4. The suspension device for underwater piezoelectric photocatalysis using river water power according to claim 1, characterized in that The preparation method of the photocatalytic-piezoelectric film (8) comprises: 1) Adding nano-piezoelectric photocatalyst to an organic solvent in which a thin film substrate is dissolved to form a mixed solution; 2) Apply the mixed solution on the substrate; 3) Spray deionized water on the surface of the substrate at a uniform speed; 4) A photocatalytic-piezoelectric film with uniform pores is formed after solvent replacement.

5. The suspension device for underwater piezoelectric photocatalysis using river water power according to claim 4, characterized in that The film substrate is polyvinylidene fluoride; The dissolution process of the film substrate in the organic solvent includes: blending polyvinylidene fluoride with the organic solvent and stirring until a transparent and uniform solution is formed; The nano-piezoelectric photocatalyst includes one, two or three of nano-ZnO, nano-BaTiO3 and single-layer MoS2.

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