Magnetic field reinforced piezoelectric-photocatalytic reaction device

Abstract

The invention discloses a piezoelectric-photocatalytic reactor which is used for water treatment and disinfection, the piezoelectric-photocatalytic reactor comprises a rotary aeration system, a circulating sand pump, a rotary sand blasting device, a photocatalytic lamp source, a reaction zone and a settling zone, piezoelectric-photocatalytic quartz sand particles need to be added into the device, the rotary aeration system is arranged at the bottom of the device, and the rotary sand blasting device is arranged at the bottom of the device. The photocatalytic lamp tubes are fixed on the lamp holder to form a photocatalytic lamp set, the reaction area has a piezoelectric effect and a photocatalytic effect at the same time to conduct catalytic reaction degradation on pollutants, the electromagnets arranged around the reaction area can generate a magnetic field and strengthen the piezoelectric photocatalytic reaction rate, and the precipitation area can achieve separation of piezoelectric photocatalytic particles and treated water. Treated water flows into the water outlet tank through the water outlet weir and then is discharged through the water outlet pipe, so that purification and disinfection of wastewater are realized.

Description

Technical Field

[0001] The present invention relates to a water treatment reactor for water purification and disinfection, belonging to the field of water treatment and environmental protection technology. The reactor adopts a piezoelectric-photocatalytic composite material, combines the collision effect generated by aeration disturbance and stirring and the photocatalytic effect, and applies a magnetic field to the piezoelectric photocatalytic material through an electromagnet to further increase the piezoelectric photocatalytic reaction rate, thereby achieving efficient purification and disinfection of the water body. Background Art

[0002] Photocatalytic technology is a green high-tech technology with important application prospects in the environmental field. It has attracted widespread attention in the field of environmental protection and has been successfully applied to the degradation research of various organic pollutants.

[0003] Piezoelectric materials generate electric potential after being asymmetrically affected by external forces. The generated built-in electric field can promote charge separation on a macro scale for catalysis. Compared with photocatalysis or electrocatalysis, only mechanical energy is used, and the dependence on light and electricity is reduced.

[0004] Combining piezoelectric materials with photocatalysts is considered an effective way to achieve photoinduced carrier separation and migration. The internal electric field generated by piezoelectric materials under strain provides a driving force for the transport of photoinduced charges in the photocatalyst body and surface, thereby promoting their separation and inhibiting their recombination. This new catalytic mechanism that simultaneously utilizes light energy and mechanical energy is called "piezoelectric photocatalysis."

[0005] When piezoelectric materials are subjected to external forces (such as ultrasound or vibration), charge separation occurs and an electric field effect is formed, thereby enhancing charge migration. However, this external force usually requires a high strength, and the external force provided by the hydrodynamic field in nature often has limited effect. For this reason, by loading piezoelectric materials on sandy particles, the inertia of the particles can be increased, thereby enhancing the stress of collision between particles and ultimately enhancing the piezoelectric effect.

[0006] The patent with publication number CN 117142566 A provides a method for promoting piezoelectric photocatalysis by using acoustic pressure mechanical waves, wherein the acoustic waves excite piezoelectric ceramics to generate a bias electric field, thereby improving the separation efficiency of photogenerated electrons and photogenerated holes.

[0007] The patent with the publication number of CN 117049644 A provides a cyclonic tube type photocatalytic reactor, in which the photocatalyst used is a photocatalytic film. In order to reduce the cost of photocatalyst separation, a photocatalytic film is often used in a photocatalytic reactor.

[0008] In a magnetic field, moving carriers are affected by the Lorentz force. The electrons and holes generated by photocatalysis and piezoelectric catalysis carry negative and positive charges respectively. When they move in the same direction, the Lorentz forces they experience are in opposite directions, which promotes the separation of electrons and holes and thus improves the efficiency of piezoelectric photocatalytic reactions.

[0009] In a magnetic field, moving carriers are affected by the Lorentz force. The electrons and holes generated by photocatalysis and piezoelectric catalysis carry negative and positive charges respectively. When they move in the same direction, the Lorentz forces they experience are in opposite directions, which promotes the separation of electrons and holes and thus improves the efficiency of piezoelectric photocatalytic reactions.

[0010] The patent with publication number CN 116161759 A provides a mechanical accelerated clarification tank, which can achieve rapid clarification of flocs. Summary of the invention

[0011] The purpose of the present invention is to provide a piezoelectric photocatalytic reactor, which promotes particle collision and enhances the piezoelectric effect through aeration by a rotary aeration system, and increases the dissolved oxygen in the treated water and the generation of superoxide free radicals; at the same time, a light source is added to trigger the photocatalytic oxidation to improve the catalytic reaction efficiency. An electromagnet is placed in the reactor, and the magnetic field generated by the electromagnet enhances the piezoelectric photocatalytic reaction efficiency.

[0012] In order to realize aeration-driven piezoelectric effect to enhance the efficiency of photocatalytic reaction, and to realize magnetic field-enhanced piezoelectric photocatalytic reaction efficiency, the present invention provides the following technical solutions: a piezoelectric-photocatalytic reaction device, the upper end of which is a hollow cylinder, the bottom of which is a conical hollow structure, the bottom of the reactor is a particle hopper, the upper center is a reaction zone, and the periphery of the reaction zone is a precipitation zone.

[0013] Furthermore, a water inlet pipe (16) and an emptying pipe (17) are arranged at the bottom of the particle hopper, and a rotary aeration device is arranged at the upper end of the particle hopper, comprising an air inlet pipe (23), a rotary joint (15), a perforated aeration pipe (13), and a paddle (12).

[0014] Furthermore, the water inlet pipe (16) is provided at the lower part of the particle hopper, and a curved pipe is provided before the water inlet pipe is connected to the reactor, so that water enters the device to generate a swirling flow.

[0015] Furthermore, the aeration method is perforated aeration, the aeration holes (14) are evenly arranged on the aeration pipe, and the aeration holes on the aeration branches on both sides are arranged in opposite directions. Aeration generates a counterclockwise driving force, and the turbulence generated by aeration causes the piezoelectric photocatalytic particles to collide with each other, while oxygenating the water and enhancing the formation of superoxide free radicals.

[0016] Furthermore, the aeration device comprises a paddle (12), and the driving force generated by aeration and the driving force of the bubbles on the pulp plate cause the paddle to rotate. The rotating paddle has a stirring effect, which promotes mass transfer and particle collision.

[0017] Furthermore, the reaction zone (19) is a piezoelectric-photocatalytic oxidation reaction zone, in which a lamp tube (20) is arranged inside and an electromagnet (21) is arranged on the side wall. The magnetic field generated by the electromagnet can affect the arrangement of molecules and atoms and the electron spin mode and spin orientation, thereby inhibiting the recombination of electron-hole pairs and promoting the efficiency of the piezoelectric-photocatalytic reaction.

[0018] Furthermore, a rotary sandblasting device is provided at the upper part of the reaction zone (19), comprising a rotary joint (6), a rotary sandblasting tube (4), and a sandblasting port (5). The rotary sandblasting device is connected to the bottom of the particle hopper through a circulation tube (2) and a circulating sand pump (18). The piezoelectric photocatalytic particles deposited in the particle hopper can be pumped to the upper end of the reactor by the circulating sand pump (18), and then uniformly dispersed to the reaction zone (19) by the rotary sandblasting device.

[0019] Furthermore, the rotating sandblasting tube (4) rotates clockwise, which is opposite to the rotation direction of the aeration device, so that the particles are evenly distributed in the device.

[0020] The periphery of the reaction zone is a sedimentation zone (10). After the piezoelectric photocatalytic particles and wastewater are mixed and reacted in the reaction zone, they are transferred to the sedimentation zone (10) for sedimentation separation. The piezoelectric photocatalytic particles sink into the particle hopper, and the treated water flows into the outlet trough (8) through the outlet weir, and then is discharged from the reactor through the outlet pipe (9), thereby completing the purification of the wastewater.

[0021] In summary, the present invention adopts the above technical solution, and the beneficial effects of the present invention are:

[0022] In the present invention, a catalyst prepared by coating piezoelectric catalysts and photocatalysts on quartz sand particles is used as a piezoelectric photocatalyst. A circulating sand pump and a rotary sandblasting device are used to achieve uniform distribution of the piezoelectric photocatalytic particles in the reaction zone of the device. Aeration is used to cause the piezoelectric photocatalytic particles to collide with each other, thereby producing a good piezoelectric effect.

[0023] The driving force and bubbles generated by aeration drive the stirring paddle to rotate, enhance the collision of piezoelectric photocatalytic particles, and rotate the aeration tube to make the aeration more uniform. Aeration and oxygenation increase the generation of superoxide free radicals.

[0024] The driving force generated by aeration and the driving force of bubbles prolong the residence time of the piezoelectric photocatalytic particles in the reaction zone, thereby enhancing the piezoelectric photocatalytic reaction effect.

[0025] The device promotes the piezoelectric photocatalytic particles to produce a good piezoelectric photocatalytic reaction effect through aeration and light source irradiation.

[0026] The magnetic field promotes the separation of holes and electrons in the piezoelectric photocatalytic particles, increases the residence time of electron-hole pairs on the catalyst surface, increases strong oxidizing substances such as hydroxyl radicals and superoxide radicals, and thus improves the piezoelectric photocatalytic oxidation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a piezoelectric-photocatalytic device of the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of a piezoelectric-photocatalytic device of the present invention.

[0029] Figure 3 It is a schematic diagram of the lamp stand structure of the device of the present invention.

[0030] Markings in the figure: 1-device body, 2-circulation pipe, 3-grid cover, 4-rotating sandblasting pipe, 5-sandblasting port, 6-rotating joint (sandblasting pipe), 7-baffle, 8-water outlet trough, 9-water outlet pipe, 10-sedimentation area, 11-piezoelectric photocatalytic particles, 12-blades, 13-perforated aeration pipe, 14-aeration holes, 15-rotating joint (aeration pipe), 16-water inlet pipe, 17-emptying pipe, 18-circulating sand pump, 19-piezoelectric photocatalytic reaction area, 20-lamp tube, 21-electromagnet, 22-lamp holder, 23-inlet pipe. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0032] Piezoelectric-photocatalytic particles are added to the reactor, and oxygen aeration is performed while water is introduced. The rotary aeration device plays the role of aeration and stirring. The particles are flushed by the water body, and the rotating aeration tube makes the aeration more uniform.

[0033] The photocatalytic lamp is turned on, and the piezoelectric photocatalytic particles are fully in contact with the water in the reaction zone. Under aeration and paddle stirring, the residence time of the piezoelectric photocatalytic particles in the reaction zone is increased, and the water is subjected to piezoelectric-photocatalytic degradation.

[0034] Turn on the electromagnet, and the magnetic field generated by the electromagnet intensifies the piezoelectric photocatalytic reaction rate.

[0035] After the water body is degraded, it passes through the water flow channel and enters the sedimentation area for separation of particles and water flow. The particles are settled in the particle hopper, and the water flows through the outlet weir and overflows into the outlet trough.

[0036] The piezoelectric-photocatalytic particles deposited at the bottom of the device are pumped to the upper end of the device by a circulating sand pump, and then evenly sprayed into the device by a rotating sand blasting device, so that the piezoelectric photocatalytic particles are evenly distributed in the reaction area, thereby enhancing the efficiency of the piezoelectric photocatalytic reaction.

[0037] The purified or disinfected water flows from the drainage weir into the drainage trough and is then discharged from the outlet pipe.

Claims

1. A piezoelectric photocatalytic reactor for water treatment, characterized in that: It includes a conical particle hopper, a reaction zone, and a sedimentation zone. A water inlet pipe and an emptying pipe are arranged at the lower end of the particle hopper, and a rotating aeration device is arranged at the upper end of the particle hopper. A light source is arranged in the reaction zone, and an electromagnet is arranged on the side wall of the reaction zone. The sedimentation zone is outside the reaction zone. Piezoelectric photocatalytic particles are separated from the water body in the sedimentation zone through a water flow channel. The particles are precipitated in the particle hopper, and the water overflows into the water outlet trough and then discharged from the reactor through the water outlet pipe.

2. A piezoelectric-photocatalytic reaction device as claimed in claim 1, characterized in that: Piezoelectric photocatalytic particles need to be added into the reaction zone.

3. A piezoelectric-photocatalytic reaction device as claimed in claim 1, characterized in that: The reaction zone needs to be provided with a lamp (20), which can be visible light or ultraviolet light.

4. A piezoelectric-photocatalytic reaction device as claimed in claim 1, characterized in that: The lamp tube (20) has the characteristics of corrosion resistance, aging resistance, high strength, etc.

5. The piezoelectric-photocatalytic reaction device according to claim 1, characterized in that: The aeration device is composed of a rotary joint (15), a perforated aeration pipe (13), an aeration hole (14) and a paddle (12). During aeration, the aeration device rotates counterclockwise to have stirring and aeration effects.

6. The piezoelectric-photocatalytic reaction device according to claim 1, characterized in that: The electromagnet (21) needs to be waterproofed so that it does not come into contact with wastewater.

7. The piezoelectric-photocatalytic reaction device according to claim 1, characterized in that: The water inlet pipe of the sand pump (18) is arranged at the bottom of the device, the water outlet pipe is arranged at the top of the device, and a rotary sandblasting device is arranged at the end of the water outlet pipe, which is composed of a rotary joint (6), a sandblasting pipe (4), and a sandblasting port (5) and can evenly distribute piezoelectric photocatalytic particles.

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