A photocatalytic water splitting reaction system

Abstract

The present invention belongs to the field of photocatalytic technology, and specifically relates to a photocatalytic complete water splitting reaction system, comprising a light source carrying device, a reactor provided inside the light source carrying device, and a magnetic stirrer provided at the bottom of the reactor; the present invention can prevent the photocatalyst from stacking or sinking to the bottom, greatly improve the absorption capacity of the photocatalyst, and improve the photocatalytic water splitting efficiency; the present invention can further improve the photohydrolysis efficiency while improving the utilization rate of the light source; the present invention can improve the stability of the external light source, and at the same time ensure that the photocatalytic water splitting reaction is carried out at a set temperature.

Description

Technical Field

[0001] The present invention belongs to the technical field of photocatalysis, and in particular relates to a photocatalytic complete water splitting reaction system. Background Art

[0002] As a clean and efficient new energy source, hydrogen energy is becoming a new energy star in the future that the world is competing to develop due to its flexibility, efficiency, cleanliness, low carbon and wide application. The development of sustainable hydrogen energy has become an important issue.

[0003] Semiconductor photocatalysts are crucial for the effectiveness of photocatalytic water splitting reactions. Examples include strontium titanate (SrTiO3), cadmium sulfide (CdS), and carbon nitride (g-C3N4), all of which are excellent photocatalytic water splitting catalysts. However, current photocatalytic water splitting for hydrogen production generally suffers from low solar-to-hydrogen conversion rates. While research on various aspects of photocatalyst modification has been extensive, improvements to photocatalytic reactor devices suitable for photocatalytic participation have been limited.

[0004] The photocatalytic reactor is one of the important factors affecting the efficiency of photolysis of water and is an important place for photochemical reactions to occur. Improving the utilization rate of light sources is the most direct solution.

[0005] Chinese patent application number CN201621073748.5 relates to a novel simulated sunlight photocatalytic reactor. Its technical solution comprises a quartz glass tube, a xenon lamp, and a magnetic stirring device. The xenon lamp is fixed directly above the quartz glass tube, emitting light that is evenly and directly directed into the tube. Light intensity in the reactor is controlled by adjusting the distance between the light source and the tube and the power of the light source. The quartz glass tube is placed on the magnetic stirring device, and a magnetic rotor is placed within the tube. Catalyst material is placed at the bottom of the tube. The stirring action of the magnetic stirring device and magnetic rotor ensures sufficient contact and reaction between the catalyst material and the wastewater. The contact between the catalyst material and the solution is controlled by controlling the speed of the magnetic stirring device. The entire photocatalytic reaction device is placed in a darkroom to eliminate the influence of other light sources on the reaction.

[0006] However, this patented photocatalyst may experience stacking problems in the photocatalytic reactor due to the small stirring range of the rotor and insufficient stirring force, resulting in a significant decrease in the photocatalyst's light absorption capacity, thereby reducing the photolysis water efficiency.

[0007] Therefore, how to improve the utilization of light sources and enhance the efficiency of photolysis of water is a technical problem that needs to be solved urgently. Summary of the Invention

[0008] The purpose of the present invention is to overcome the above-mentioned defects. The present invention provides a photocatalytic water splitting reaction system. The present invention can prevent the photocatalyst from stacking or sinking to the bottom, greatly improve the absorption capacity of the photocatalyst, and improve the photocatalytic water splitting efficiency; while improving the utilization rate of the light source, the photohydrolysis efficiency can be further improved; the present invention can improve the stability of the external light source and at the same time ensure that the photocatalytic water splitting reaction is carried out at a set temperature.

[0009] In order to achieve the above objectives, a photocatalytic water splitting reaction system is proposed, and the technical solution is as follows:

[0010] A photocatalytic water splitting reaction system comprises a light source supporting device, a reactor is provided inside the light source supporting device, and a magnetic stirrer is provided at the bottom of the reactor;

[0011] The reactor includes a transparent reaction pool with an opening at the top, a light-transmitting cover movably inserted at the top opening of the reaction pool, the reaction pool includes an outer cavity and an inner cavity, the outer cavity and the inner cavity are connected to form a sealed thermal insulation interlayer, the lower left end of the outer cavity is connected to a water inlet, and the upper right end of the outer cavity is connected to a water outlet; the upper right end of the inner cavity is connected to a gas sampling port, and the upper left end of the inner cavity is connected to an air inlet pipe, the air inlet pipe and the gas sampling port both pass through the outer cavity and extend to the outside of the reaction pool; the gas sampling port is located above the water outlet; a magnetic rotor device is provided inside the reaction pool.

[0012] Preferably, the rotor device comprises a cylindrical rotor with magnetism, a rotation groove is provided in the middle of the rotor, and stirring devices made of polytetrafluoroethylene are symmetrically provided at both ends of the top of the rotor.

[0013] More preferably, the stirring device includes an L-shaped connecting column, two of the L-shaped connecting columns are symmetrically fixedly connected to the two ends of the top of the rotor, and the end of the L-shaped connecting column away from the rotor is rotatably connected to the middle of the stirring disk through a bearing. A plurality of stirring blades are evenly fixedly connected around the stirring disk, and the angle between the plane where the stirring blades are located and the plane where the stirring disk is located is 30 to 60°.

[0014] More preferably, the outlet end of the air inlet pipe faces the inner bottom surface of the reaction tank, the outlet end of the air inlet pipe is threadedly connected to an exhaust pipe made of polytetrafluoroethylene, and the end of the exhaust pipe away from the air inlet pipe is a trumpet structure.

[0015] More preferably, the exhaust pipe passes through the rotation groove of the rotor and is rotationally connected to the rotation groove, and the maximum outer diameter of the trumpet structure at one end of the exhaust pipe is larger than the inner diameter of the rotation groove.

[0016] More preferably, the distance between the end of the exhaust pipe away from the air inlet pipe and the inner bottom surface of the reaction tank is 2 to 5 cm.

[0017] More preferably, the light source carrying device includes a carrying frame, a carrying ring is fixedly connected to the bottom of the inner wall of the carrying frame, and C-shaped long grooves are symmetrically arranged at the front and rear ends of the carrying frame. The end of the C-shaped long groove away from the carrying frame serves as a supporting end, and a rack is movably inserted in the C-shaped long groove, and the tooth surface of the rack extends out of the groove of the C-shaped long groove. A threaded hole is commonly provided at the connection between the C-shaped long groove and the carrying frame, and the threaded hole is screwed to a limiting screw.

[0018] More preferably, ear plates are provided on both sides of the C-shaped long groove, and the ear plates are fixedly connected to the supporting frame. The middle parts of two adjacent ear plates are rotatably connected to a rotating shaft, and the middle part of the rotating shaft is fixedly connected to a gear, and the gear is engaged with the rack. Both ends of the rotating shaft pass through the ear plates and the two ends of the rotating shaft are commonly connected to an arc-shaped reflective plate.

[0019] More preferably, one end of the two racks close to the carrying frame is commonly connected to a control frame.

[0020] More preferably, the number of stirring blades on each stirring plate is 6 or more.

[0021] Compared with the prior art, the present invention provides a photocatalytic water splitting reaction system with the following beneficial effects:

[0022] (1) The present invention controls the rotor device to perform magnetic stirring through a magnetic stirrer, so that the rotor device realizes circular rotation for preliminary stirring. During the circular rotation of the rotor device, due to the obstruction of the suspension in the reaction tank, and the angle design of the stirring plate and the stirring blade of the present invention causes the stirring plate and the stirring blade to rotate, driving the suspension in the reaction tank to stir and circulate up and down, thereby preventing the photocatalyst from stacking or sinking to the bottom. Then, by introducing gas into the air inlet pipe and blowing air to the bottom of the reaction tank through the trumpet-shaped exhaust pipe, the photocatalyst at the bottom of the reaction tank is fully blown up, further preventing the stacking or sinking phenomenon, thereby greatly improving the absorption capacity of the photocatalyst and improving the efficiency of photolysis of water.

[0023] (2) The present invention adopts the design of a light source carrying device, places an external light source on the carrying ring and the carrying frame, and then pulls the control frame up and down to drive the rack to move. The gear rotates through the engagement of the rack and the gear, thereby opening or closing the arc reflector, thereby realizing the reflection adjustment of the arc reflector to the light source. While improving the utilization rate of the light source, the rotor device and the exhaust pipe are combined to enable the light source to evenly illuminate the suspension to be reacted, and the photohydrolysis efficiency is further improved.

[0024] (3) The control frame of the present invention can not only control the displacement of the rack, but also cooperate with the bearing frame to limit the external light source, thereby improving the stability of the external light source.

[0025] (4) The present invention uses a thermal insulation interlayer and a water inlet and outlet design with the left side lower and the right side higher, so that circulating water with temperature enters from the water inlet and is discharged from the water outlet, so that the thermal insulation interlayer has the functions of heating and heat preservation, thereby ensuring that the photolysis water reaction is carried out at the set temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a photocatalytic water splitting reaction system of the present invention;

[0027] Figure 2 This is a schematic diagram of the dispersed structure of a photocatalytic water splitting reaction system of the present invention;

[0028] Figure 3 This is a schematic structural diagram of a rotor device in a photocatalytic water splitting reaction system according to the present invention;

[0029] Figure 4 This is a schematic structural diagram of a light source carrying device of a photocatalytic water splitting reaction system of the present invention;

[0030] Figure 5 This is a partial cross-sectional structural diagram of a photocatalytic water splitting reaction system of the present invention.

[0031] The figures are marked as follows: light source carrying device 100; carrying frame 110; carrying ring 111; ear plate 112; gear 113; rotating shaft 114; control frame 115; rack 116; arc-shaped reflector 117; C-shaped long groove 118; screw 119; reactor 200; light-transmitting cover 210; rotor device 220; rotor 221; rotating groove 222; L-shaped connecting column 223; stirring plate 224; bearing 225; stirring blade 226; exhaust pipe 230; reaction tank 240; water inlet 241; water outlet 242; gas sampling port 243; air inlet pipe 244; outer cavity 245; inner cavity 246; magnetic stirrer 300. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below in conjunction with the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other if there is no conflict.

[0033] Example 1:

[0034] A photocatalytic water splitting reaction system includes a light source carrying device 100, a reactor 200 is provided inside the light source carrying device 100, and a magnetic stirrer 300 is provided at the bottom of the reactor 200;

[0035] The reactor 200 includes a transparent reaction pool 240 with an opening at the top, and a translucent cover 210 is movably inserted at the top opening of the reaction pool 240. The reaction pool 240 includes an outer cavity 245 and an inner cavity 246. The outer cavity 245 and the inner cavity 246 are connected to form a sealed thermal insulation interlayer. The lower left end of the outer cavity 245 is connected to a water inlet 241, and the upper right end of the outer cavity 245 is connected to a water outlet 242; the upper right end of the inner cavity 246 is connected to a gas sampling port 243, and the upper left end of the inner cavity 246 is connected to an air inlet pipe 244. The air inlet pipe 244 and the gas sampling port 243 both pass through the outer cavity 245 and extend to the outside of the reaction pool 240; the gas sampling port 243 is located above the water outlet 242; and a magnetic rotor device 220 is provided inside the reaction pool 240.

[0036] The reaction tank 240 is opened and closed through the light-transmitting cover 210 , and catalysts and materials are added from the top opening of the reaction tank 240 .

[0037] The gas generated by the photocatalytic reaction can be collected and sampled through the gas sampling port 243 .

[0038] It is worth noting that the water inlet 241, the water outlet 242, the air inlet pipe 244 and the gas sampling port 243 are all equipped with valves to control the operating state of each port and achieve flexible adjustment. The magnetic stirrer 300 is an existing mature technology and will not be described in detail here.

[0039] The present invention uses a thermal insulation interlayer and a water inlet 220 and a water outlet 240 that are lower on the left and higher on the right, so that circulating water with temperature enters from the water inlet 220 and is discharged from the water outlet 240, so that the thermal insulation interlayer has heating and heat preservation functions, thereby ensuring that the photolysis water reaction is carried out at the set temperature.

[0040] In this embodiment, the rotor device 220 includes a cylindrical rotor 221 with magnetic properties. A rotation groove 222 is formed in the middle of the rotor 221 . Stirring devices made of polytetrafluoroethylene are symmetrically provided at both ends of the top of the rotor 221 .

[0041] In this embodiment, the stirring device includes an L-shaped connecting column 223, and the two L-shaped connecting columns 223 are symmetrically fixedly connected to the two ends of the top of the rotor 221. The end of the L-shaped connecting column 223 away from the rotor 221 is rotatably connected to the middle of the stirring disk 224 through a bearing 225. A plurality of stirring blades 226 are evenly fixedly connected around the stirring disk 224, and the angle between the plane where the stirring blades 226 are located and the plane where the stirring disk 224 is located is 30 to 60°.

[0042] In this embodiment, the outlet end of the air inlet pipe 244 faces the inner bottom surface of the reaction tank 240, and the outlet end of the air inlet pipe 244 is threadedly connected to the exhaust pipe 230 made of polytetrafluoroethylene. The end of the exhaust pipe 230 away from the air inlet pipe 244 is a trumpet structure.

[0043] The threaded connection between the outlet end of the air inlet pipe 244 and the exhaust pipe 230 allows the exhaust pipe 230 to be easily disassembled, thereby facilitating the disassembly, assembly and cleaning of the exhaust pipe 230 and the rotor device 220 .

[0044] In this embodiment, the exhaust pipe 230 passes through the rotation slot 222 of the rotor 221 and is rotationally connected to the rotation slot 222 . The maximum outer diameter of the horn structure at one end of the exhaust pipe 230 is greater than the inner diameter of the rotation slot 222 .

[0045] The design of the exhaust pipe 230 can limit the rotor device 220 to prevent the rotor device 220 from deviating during the rotation process.

[0046] In this embodiment, the distance between the end of the exhaust pipe 230 away from the air inlet pipe 244 and the inner bottom surface of the reaction tank 240 is 2 to 5 cm.

[0047] In this embodiment, the light source carrying device 100 includes a carrying frame 110, and a carrying ring 111 is fixedly connected to the bottom of the inner wall of the carrying frame 110. The front and rear ends of the carrying frame 110 are symmetrically provided with C-shaped long grooves 118. The end of the C-shaped long groove 118 away from the carrying frame 110 serves as a supporting end. A rack 116 is movably inserted in the C-shaped long groove 118, and the tooth surface of the rack 116 extends out of the groove of the C-shaped long groove 118. A threaded hole is commonly provided at the connection between the C-shaped long groove 118 and the carrying frame 110, and the threaded hole is screwed to a limiting screw 119.

[0048] In this embodiment, ear plates 112 are provided on both sides of the C-shaped long groove 118, and the ear plates 112 are fixedly connected to the supporting frame 110. The middle parts of two adjacent ear plates 112 are rotatably connected to a rotating shaft 114, and the middle part of the rotating shaft 114 is fixedly connected to a gear 113, and the gear 113 is engaged with the rack 116. The two ends of the rotating shaft 114 pass through the ear plates 112 and the two ends of the rotating shaft 114 are commonly connected to an arc-shaped reflective plate 117.

[0049] In this embodiment, one end of the two racks 116 close to the carrying frame 110 is commonly connected to the control frame 115 .

[0050] The control frame 115 of the present invention can not only control the displacement of the rack 116, but also cooperate with the carrying frame 110 to limit the external light source, thereby improving the stability of the external light source.

[0051] In this embodiment, the number of stirring blades 226 on each stirring disk 224 is more than 6.

[0052] The present invention controls the rotor device 400 to perform magnetic stirring through the magnetic stirrer 300, so that the rotor device 400 realizes circular rotation for preliminary stirring. During the circular rotation of the rotor device 400, it is hindered by the suspension in the reaction tank 200, and the angle design of the stirring plate 430 and the stirring blade 432 of the present invention causes the stirring plate 430 and the stirring blade 432 to rotate, driving the suspension in the reaction tank 200 to stir and circulate up and down, thereby preventing the photocatalyst from stacking or sinking to the bottom. Then, by introducing a specified gas, such as nitrogen, into the air inlet pipe 244, the trumpet-shaped exhaust pipe 230 blows air to the bottom of the reaction tank 240, so that the photocatalyst at the bottom of the reaction tank 240 is fully blown up, further preventing stacking or sinking, thereby greatly improving the absorption capacity of the photocatalyst and improving the efficiency of photolysis of water.

[0053] The present invention adopts the design of the light source carrier device 100, places an external light source on the carrier ring 111 and the carrier frame 110, and then pulls the control frame 115 up and down to drive the rack 116 to move. The gear 113 is rotated by the engagement of the rack 116 and the gear 113, so that the arc reflector 117 is opened or closed, thereby realizing the reflection adjustment of the arc reflector 117 to the light source. While improving the utilization rate of the light source, in conjunction with the rotor device 220 and the exhaust pipe 230, the light source can evenly illuminate the suspension to be reacted, and the photohydrolysis efficiency is further improved.

[0054] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and variations to this specification. Such modifications, improvements, and variations are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

[0055] In addition, it will be understood by those skilled in the art that various aspects of this specification may be illustrated and described by a number of patentable categories or situations, including any new and useful process, machine, product or combination of substances, or any new and useful improvement thereof. Accordingly, various aspects of this specification may be performed entirely by hardware, entirely by software including firmware, resident software, microcode, etc., or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". In addition, various aspects of this specification may be represented as a computer product located in one or more computer-readable media, which includes computer-readable program code.

[0056] It should be noted that if the descriptions, definitions, and / or usage of terms in the accompanying materials of this specification are inconsistent or conflicting with the contents of this specification, the descriptions, definitions and / or usage of terms in this specification shall prevail.

[0057] Finally, it should be understood that the embodiments described in this specification are intended only to illustrate the principles of the embodiments of this specification. Other variations are also possible and fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the implementations explicitly described and illustrated in this specification.

Claims

1. A photocatalytic water splitting reaction system, characterized in that: It comprises a light source carrying device (100), a reactor (200) is provided inside the light source carrying device (100), and a magnetic stirrer (300) is provided at the bottom of the reactor (200); The reactor (200) comprises a transparent reaction pool (240) with an opening at the top, a light-transmitting cover (210) being movably inserted at the top opening of the reaction pool (240), the reaction pool (240) comprising an outer cavity (245) and an inner cavity (246), the outer cavity (245) and the inner cavity (246) being connected to form a sealed heat-insulating interlayer, the lower left end of the outer cavity (245) being connected to a water inlet (241), and the upper right end of the outer cavity (245) being connected to a water outlet (242); the upper right end of the inner cavity (246) is connected to a gas sampling port (243), and the upper left end of the inner cavity (246) is connected to an air inlet pipe (244), and the air inlet pipe (244) and the gas sampling port (243) both pass through the outer cavity (245) and extend to the outside of the reaction tank (240); the gas sampling port (243) is located above the water outlet (242); a magnetic rotor device (220) is provided inside the reaction tank (240); The rotor device (220) comprises a cylindrical rotor (221) with magnetism, a rotation groove (222) is provided in the middle of the rotor (221), and stirring devices made of polytetrafluoroethylene are symmetrically provided at both ends of the top of the rotor (221); The stirring device comprises an L-shaped connecting column (223), wherein two L-shaped connecting columns (223) are symmetrically fixedly connected to the two ends of the top of the rotor (221), and one end of the L-shaped connecting column (223) away from the rotor (221) is rotatably connected to the middle of the stirring disk (224) via a bearing (225). A plurality of stirring blades (226) are evenly fixedly connected around the stirring disk (224), and the angle between the plane where the stirring blades (226) are located and the plane where the stirring disk (224) is located is 30-60 degrees. The outlet end of the air inlet pipe (244) faces the inner bottom surface of the reaction tank (240), and the outlet end of the air inlet pipe (244) is threadedly connected to an exhaust pipe (230) made of polytetrafluoroethylene, and the end of the exhaust pipe (230) away from the air inlet pipe (244) is a trumpet structure; The exhaust pipe (230) passes through the rotation groove (222) of the rotor (221) and is rotationally connected to the rotation groove (222), and the maximum outer diameter of the horn structure at one end of the exhaust pipe (230) is greater than the inner diameter of the rotation groove (222); The light source carrying device (100) comprises a carrying frame (110), the bottom of the inner wall of the carrying frame (110) is fixedly connected to a carrying ring (111), the front and rear ends of the carrying frame (110) are symmetrically provided with C-shaped long grooves (118), one end of the C-shaped long groove (118) away from the carrying frame (110) serves as a supporting end, a rack (116) is movably inserted into the C-shaped long groove (118), the tooth surface of the rack (116) extends out of the groove of the C-shaped long groove (118), and a threaded hole is commonly provided at the connection between the C-shaped long groove (118) and the carrying frame (110), and the threaded hole is screwed to a limiting screw (119); Ear plates (112) are provided on both sides of the C-shaped long groove (118), and the ear plates (112) are fixedly connected to the supporting frame (110). The middle parts of two adjacent ear plates (112) are rotatably connected to a rotating shaft (114), and the middle part of the rotating shaft (114) is fixedly connected to a gear (113), and the gear (113) is meshed with a rack (116). Both ends of the rotating shaft (114) pass through the ear plates (112) and the two ends of the rotating shaft (114) are commonly connected to an arc-shaped reflective plate (117).

2. The photocatalytic water splitting reaction system according to claim 1, characterized in that: The distance between the end of the exhaust pipe (230) away from the air inlet pipe (244) and the inner bottom surface of the reaction tank (240) is 2 to 5 cm.

3. The photocatalytic water splitting reaction system according to claim 1, characterized in that: One end of the two racks (116) close to the carrying frame (110) is commonly connected to a control frame (115).

4. The photocatalytic water splitting reaction system according to claim 1, characterized in that: The number of stirring blades (226) on each stirring disk (224) is more than 6.

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