Photocatalytic reaction device

Abstract

The utility model discloses a photocatalytic reaction device and relates to the technical field of photocatalysis. According to the scheme, the photocatalytic reaction device comprises a base and a reaction device body, a light source in the reaction device body is arranged on the outer side of a reaction tube assembly, and the light source and the reaction tube assembly are arranged close to each other, so that the light source utilization rate is increased; the heating module of the base can heat the heat-conducting medium in the transparent container provided with the reaction tube assembly while the light source irradiates, so that good experimental conditions are provided for research on photocatalytic reaction and thermocatalytic reaction at the same time.

Description

Technical Field

[0001] This application relates to the field of photocatalysis technology, and in particular to a photocatalytic reaction device. Background Technology

[0002] Photocatalysis has the advantages of mild reaction conditions and being environmentally friendly, and it is widely used in fields such as organic synthesis and pollutant degradation.

[0003] In basic research conducted in the laboratory, it is often necessary to perform photocatalytic treatment on multiple samples simultaneously. In related technologies, photocatalytic reaction devices mainly use light sources such as xenon lamps and mercury lamps to achieve photocatalytic reactions. In order to place multiple reaction tubes and achieve simultaneous photocatalytic treatment of multiple samples, the reaction tubes and the light source must be separated by a certain distance, resulting in low light source utilization and poor reaction effect. Moreover, existing photocatalytic reaction devices and thermocatalytic reaction devices are independent of each other, making it impossible to conduct research on photocatalytic and thermocatalytic reactions simultaneously. Summary of the Invention

[0004] This specification provides a photocatalytic reaction device to solve the problem in the prior art where the utilization rate of the light source is low and it is impossible to conduct photocatalytic and thermocatalytic reaction research simultaneously.

[0005] To solve the above-mentioned technical problems, the embodiments in this specification are implemented as follows:

[0006] This specification provides an embodiment of a photocatalytic reaction device, comprising:

[0007] A base, on which a heating module is mounted;

[0008] The reaction device body includes a light shield, a transparent container, a reaction tube assembly, and a light source. The light shield is mounted on a base and has an installation space. The transparent container is located within the installation space and has a hollow cavity with a first opening at the top for storing a heat-conducting medium. The reaction tube assembly is disposed within the transparent container and includes multiple reaction tubes, all of which are located close to the inner wall of the transparent container. The light source is located on the inner wall of the light shield.

[0009] The heating plate of the heating module is in contact with the transparent container.

[0010] One embodiment of this specification can achieve the following beneficial effects: The photocatalytic reaction device includes a base and a reaction device body. The light source in the reaction device body is set outside the reaction tube assembly. The light source and the reaction tube assembly are set close to each other, which improves the utilization rate of the light source. At the same time, the heating module of the base can heat the heat-conducting medium in the transparent container where the reaction tube assembly is set while the light source is irradiating it, providing good experimental conditions for the study of photocatalytic reaction and thermocatalytic reaction at the same time. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of a photocatalytic reaction device provided in the embodiments of this specification;

[0013] Figure 2 A top view of the photocatalytic reaction apparatus using plugging element A provided in the embodiments of this specification;

[0014] Figure 3 A cross-sectional view of a transparent container employing sealing element B, provided for an embodiment of this specification;

[0015] Figure 4 Comparison charts of experimental results using LED light sources and xenon lamps, respectively, provided for the embodiments in the specification;

[0016] Figure 5 The diagram shows a comparison of experimental results using an LED light source under different experimental conditions, as provided in the embodiments of the specification.

[0017] Figure descriptions: 1-Transparent container; 2-Reaction tube; 3-Light shield; 4-Light source; 5-Base; 6-Heating control module; 7-Speed ​​control module; 8-Jacket; 9-First cooling medium inlet; 10-First cooling medium outlet; 11-First sealing element; 12-Second sealing element; 13-Heat insulation device; 14-Steam outlet pipe; 15-Thermocouple; 16-Second cooling medium inlet pipe; 17-Second cooling medium outlet pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of one or more embodiments of this specification clearer, the technical solutions of one or more embodiments of this specification will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of them. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of one or more embodiments of this specification.

[0019] Photocatalysis offers advantages such as mild reaction conditions and environmental friendliness, leading to its widespread application in organic synthesis and pollutant degradation in recent years. Currently, photocatalytic reactions are primarily achieved using light sources such as xenon lamps and mercury lamps. The most commonly available "photocatalytic reactors" on the market are equipped with high-pressure mercury lamps or xenon lamps. The light source in these reactors is placed in a central cold trap, surrounded by multiple reaction tubes. The distance between the reaction tubes and the light source is relatively large, resulting in low light utilization. According to Beer-Lambert's law, light intensity decreases exponentially with distance, leading to poor photocatalytic reaction performance.

[0020] The technical solutions provided in the various embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0021] To address the shortcomings of existing technologies, this solution provides the following embodiments:

[0022] The photocatalytic reaction device provided in the embodiments of the specification will be described in detail with reference to the accompanying drawings.

[0023] The photocatalytic reaction device described in this specification may include:

[0024] Base 5, on which a heating module 6 is provided;

[0025] The reaction device body includes a light shield 3, a transparent container 1, a reaction tube assembly, and a light source 4. The light shield 3 is mounted on the base 5 and has an installation space. The transparent container 1 is located within the installation space and has a hollow cavity with a first opening at the top for storing a heat-conducting medium. The reaction tube assembly is disposed within the transparent container 1 and includes multiple reaction tubes 2, all of which are located close to the inner wall of the transparent container 1. The light source 4 is disposed on the inner wall of the light shield 3.

[0026] The heating plate of the heating module 6 is in contact with the transparent container 1.

[0027] Figure 1 This is a schematic diagram of a photocatalytic reaction device provided in the embodiments of this specification.

[0028] like Figure 1 As shown, the photocatalytic reaction device may include a base 5 and a reaction device body. The reaction device body may include, from the inside out, a reaction tube assembly, a transparent container 1, a light source 4, and a light shield 3.

[0029] In this embodiment, the transparent container 1 has a hollow cavity for storing a heat-conducting medium. The top of the transparent container 1 has an opening to facilitate the injection of the heat-conducting medium and the installation of the reaction tube assembly. The transparent container 1 is made of a transparent material, which allows light to pass through, thereby improving photocatalytic efficiency.

[0030] The reaction tube assembly may include multiple reaction tubes 2, which can simultaneously screen multiple reaction conditions, improving experimental efficiency. All reaction tubes 2 are housed within a transparent container 1 and positioned as close as possible to the inner wall of the container 1 to minimize the distance between all reaction tubes 2 and the light source 4. The transparent container 1 provides a constant temperature environment for the reaction tubes 2.

[0031] The light shield 3 can provide an installation position for the light source 4. At the same time, the light shield 3 can prevent the strong light generated by the light source from shining on the outside and causing eye damage to the experimenters. The light shield 3 is equipped with a jacket to remove the heat generated by the light source in a timely manner.

[0032] The light source 4 can be an LED light source, which may include LED strips, LED tubes, etc. The light source 4 is located on the inner wall of the light shield 3. The specific arrangement of the light source is not limited here. The light source 4 faces the reaction tube 2. The light source 4 can be placed in close contact with the transparent container 1 containing the reaction tube 2 to reduce the distance between the light source 4 and the reaction tube 2, thereby improving light utilization. Using an LED light source 4 reduces the cost compared to existing high-pressure mercury lamps or xenon lamps. Simultaneously, the low power consumption of the LED light source 4 reduces energy consumption.

[0033] The heating module 6 in base 5 heats the heat-conducting medium, combining photocatalysis and thermal catalysis to broaden the reaction temperature range. The heating module can be any module that provides heating functionality, such as resistance heating, magnetic heating, etc., and is not specifically limited here.

[0034] The transparent container 1 and the light shield 3 are both located above the base 5 and in contact with the base 5. The transparent container 1 and the light shield 3 can move freely above the base 5.

[0035] In practice, this photocatalytic reaction device can be used to carry out photocatalytic reactions, thermocatalytic reactions, and photothermal catalytic reactions.

[0036] In this embodiment, the light source 4 in the main body of the reaction device is positioned outside the reaction tube assembly. The close proximity of the light source and the reaction tube assembly improves the utilization rate of the light source. Simultaneously, the heating module 6 of the base 5 can heat the heat-conducting medium in the transparent container 1 containing the reaction tube assembly while the light source 4 is irradiating it, providing excellent experimental conditions for the simultaneous study of photocatalytic and thermocatalytic reactions. This photocatalytic reaction device has a compact overall structure, is smaller in size than existing photocatalytic reactors, and is easier to operate and maintain.

[0037] Prolonged exposure can cause the temperature of the light source 4 to rise and become damaged. Furthermore, in the embodiments of this specification, the outer side of the light shield 3 is provided with a jacket 8, and the jacket 8 is provided with a first cooling medium inlet 9 and a first cooling medium outlet 10 that can communicate with the cooling medium.

[0038] In application, the jacket 8 set on the light shield 3 removes the heat generated by the light source 4 in time, reducing the damage to the light source 4 caused by excessive temperature.

[0039] The cooling medium can be water or other cooling media. The first cooling medium inlet 9 and the first cooling medium outlet 10 provided on the jacket 8 can be connected to an external cooling medium circulation system to introduce the cooling medium into the jacket 8, and then discharge it after heat exchange, absorbing the heat generated by the light source 4 and maintaining the temperature stability of the light source 4.

[0040] To facilitate fixing the reaction tube 2, the embodiments of this specification may further include:

[0041] The first sealing element 11 is disposed at the first opening. The first sealing element 11 is provided with a plurality of first through holes, and the reaction tube 2 passes through the first through holes.

[0042] In this embodiment of the specification, the first sealing element 11 can effectively prevent the heat transfer medium from leaking out of the cavity. The first through hole can be set close to the edge of the first sealing element 11 to reduce the distance between the reaction tube 2 and the light source 4. The first through hole corresponds one-to-one with the reaction tube 2, and each reaction tube 2 can completely seal one first through hole. The reaction tube 2 and the first through hole can be connected by sealing rings or the like to ensure that the reaction tube 2 can be stably and sealed into the cavity, thus ensuring the accuracy and safety of the experiment.

[0043] Furthermore, in the embodiments of this specification, the light source 4 is spirally wound or vertically arranged along the axis of the light shield 3.

[0044] In practical applications, the arrangement of light source 4 is selected according to application requirements and experimental conditions. The length of light source 4 and the type of light source (e.g., ultraviolet light, visible light) can be adjusted according to experimental needs.

[0045] Furthermore, in the embodiments of this specification, the first sealing member 11 is provided with a second through hole or a third through hole; the second through hole includes a thermocouple through hole and a steam outlet, and the third through hole includes a second cooling medium inlet and a second cooling medium outlet.

[0046] In the embodiments of this specification, different first sealing components 11 can be used depending on the experimental conditions. When the experiment requires a high-temperature reaction, a first sealing component 11 including a first through hole and a second through hole is used. In this case, the thermocouple 15 can pass through the thermocouple through hole to monitor the temperature inside the cavity. A steam outlet pipe 14 is set at the steam outlet to discharge the steam generated inside the cavity. The steam outlet pipe 14 and the steam outlet can be connected by a sealing ring or the like. When the experiment requires a low-temperature reaction, a first sealing component 11 including a first through hole and a third through hole is used. A second cooling medium inlet pipe 16 is set at the second cooling medium inlet to allow cooling liquid or other cooling media to enter the cavity to absorb and remove the heat generated during the reaction. The second cooling medium inlet pipe 16 and the second cooling medium inlet can be connected by a sealing ring or the like. A second cooling medium outlet pipe 17 is set at the second cooling medium outlet to discharge the cooled medium after heat exchange from the cavity. The second cooling medium outlet pipe 17 and the second cooling medium outlet can be connected by a sealing ring or the like. The second cooling medium inlet pipe 16 and the second cooling medium outlet pipe 17 can be connected to a low-temperature constant temperature device for recycling. By providing a second or third through hole on the first sealing element 11, precise control of the temperature inside the cavity can be achieved.

[0047] In practical applications, the photocatalytic reaction device may also include a controller that monitors the actual temperature of the heat-conducting medium in real time via thermocouples and feeds this temperature data back to the controller. The controller compares the received actual temperature with the preset target temperature. If there is a deviation, the controller will issue corresponding control commands based on the magnitude and direction of the deviation to drive the heating module to work, thereby adjusting the temperature of the heat-conducting medium to approach the target temperature.

[0048] Figure 2 This is a top view of a photocatalytic reaction apparatus using a plugging element A, provided as an embodiment of this specification.

[0049] Figure 3 This is a cross-sectional view of a transparent container using sealing element B, provided as an embodiment of this specification.

[0050] In practical applications, room temperature can be used as the boundary. When the experiment requires the reaction temperature of reaction tube 2 to be higher than room temperature, a sealing component A with a first through hole and a second through hole can be used; when the experiment requires the reaction temperature of reaction tube 2 to be lower than room temperature, a sealing component B with a first through hole and a third through hole can be used.

[0051] To facilitate the handling of reaction tube 2 during the experiment, the light shield 3 described in this embodiment of the specification is further provided with a second opening at its top. The photocatalytic reaction device may also include:

[0052] The second sealing element 12 is disposed at the second opening, and the second sealing element 12 is provided with a fourth through hole.

[0053] In the embodiments described in this specification, the reaction tube 2 can be removed or placed using the second sealing member 12 during the experiment, avoiding overall movement of the light shield 3. The fourth through hole corresponds to the second or third through hole.

[0054] In practical applications, the shape and size of the fourth through hole can correspond to the second or third through hole. The fourth through hole can also be a universal through hole that is applicable to both the second and third through holes. The center point of the fourth through hole can be kept on the same straight line in the vertical direction as the center point of the second or third through hole, ensuring that objects passing through the second or third through hole (such as thermocouple 15, cooling medium pipe, etc.) can pass smoothly through the fourth through hole of the second sealing member 12 without being obstructed or bent.

[0055] To ensure the uniformity of the reaction solution in the reaction tube 2, the photocatalytic reaction device described in this embodiment may further include a stirring element disposed inside the reaction tube 2, and the base 5 includes a speed control module 7, which is used to control the speed of the stirring element.

[0056] In this embodiment, the rotation speed control module 7 can control the rotation speed of the stirring element located in each reaction tube 2. The stirring element can be a stir bar, and its rotation within the reaction tube 2 ensures the uniformity of the reaction solution and improves reaction efficiency. By precisely controlling the rotation speed of the stirring element, the photocatalytic reaction results can be further optimized.

[0057] In practice, base 5 can be a magnetic stirrer.

[0058] To reduce the impact of the heating module 6 of the base 5 on the light shield 3, the light shield 3 in this embodiment of the specification is further provided with a heat insulation device 13 at the bottom, and the heat insulation device 13 is disposed between the light shield 3 and the heating plate.

[0059] In the embodiments described in this specification, the heat insulation device 13 can reduce or prevent the heat generated by the heating module 6 from affecting the temperature of the light shield 3, thereby ensuring that the temperature of the light shield 3 remains stable.

[0060] When the distance between the light source 4 and the transparent container 1 is too far, the light may be attenuated during propagation, resulting in insufficient light intensity received by the reaction solution inside the transparent container 1, thereby affecting the efficiency and rate of the photocatalytic reaction. Furthermore, in the embodiments of this specification, the distance between the light source 4 and the transparent container 1 is 0-2 cm.

[0061] In the embodiments of this specification, the distance between the light source 4 and the transparent container 1 is controlled within the range of 0-2cm. This ensures that the light can fully irradiate the reaction solution while maintaining a relatively uniform light distribution, thereby optimizing the process and result of the photocatalytic reaction.

[0062] Furthermore, in the embodiments of this specification, the reaction tube 2 and the transparent container 1 are made of quartz.

[0063] In the embodiments described in this specification, the quartz material has good light transmittance, which allows the light emitted by the light source 4 to fully illuminate the solution in the reaction tube 2, thereby improving the efficiency and rate of the photocatalytic reaction.

[0064] In practice, reaction tube 2 and transparent container 1 can be made of any material with good light transmittance.

[0065] Figure 4 The accompanying diagram shows a comparison of experimental results using LED light sources and xenon lamps, respectively, for the embodiments provided in the specification.

[0066] An experiment was conducted on the photocatalytic degradation of ofloxacin wastewater using 50.0% TS-1 / C3N4 composite material as the photocatalyst, with an ofloxacin concentration of 6 mg / L and a stirring rate of 1000 r / min. The experimental steps were as follows:

[0067] (1) Weigh a certain amount of catalyst and place it in a reaction tube, then add 10 mL of ofloxacin (OFX) solution;

[0068] (2) Turn on the magnetic stirrer and stir the mixed solution in the dark for 30 minutes to reach adsorption-desorption equilibrium;

[0069] (3) Open the low-temperature thermostat bath and start the cooling water circulation;

[0070] (4) Turn on the LED light source to carry out photocatalytic degradation reaction. Sample once every 5 minutes. Centrifuge the sample, take the supernatant and filter it through a 0.22μm filter membrane. Use a UV-Vis spectrophotometer to measure the absorbance of OFX (290nm). Determine the concentration of ofloxacin in the sample based on the absorbance.

[0071] like Figure 4As shown in Figure (a), LED light source 4 is used. The parameters of the LED device are voltage 24V, power 20W / m, and length of LED light source 4 10m. Figure (b) uses a xenon lamp. The parameters of the xenon lamp device are voltage 220V and power 500W. Detailed data on photocatalytic degradation effect under different catalyst concentration conditions are shown in Table 1.

[0072] Table 1. Data on the treatment effect of ofloxacin wastewater

[0073]

[0074] Table 1 shows that when the catalyst concentration is low, the removal rate of the device using LED light source 4 is slightly lower than that of the xenon lamp device after 25 minutes of illumination. This may be because insufficient catalyst dosage affects the effective utilization of photons. When the catalyst concentration increases, for example, to 1.2 g / L, 1.4 g / L, and 1.6 g / L, the removal rate of the device using LED light source is higher than that of the xenon lamp device after 25 minutes of illumination, and the difference in removal rate increases with the increase of catalyst concentration. When the catalyst dosage is sufficient, the existing photocatalytic reaction device using xenon lamp has a reduced number of photons reaching the reaction tube 2 due to the greater distance between the reaction tube 2 and the light source, which affects the photocatalytic reaction. The following are the calculation formulas for removal rate (RE%) and removal rate difference (AD%):

[0075]

[0076] AD% = RE% (LED) - RE% (Xenon lamp)

[0077] Where C0 is the initial concentration of ofloxacin, C t The concentration of ofloxacin after t minutes of light exposure.

[0078] Figure 5 The diagram shows a comparison of experimental results using an LED light source under different experimental conditions, as provided in the embodiments of the specification.

[0079] An experiment was conducted using LED light source 4 and Bi2WO6 as a photocatalyst to perform photocatalytic degradation of ofloxacin. Figure 5 As shown in Figure (a), the experimental conditions were a catalyst concentration of 1 g / L and a stirring rate of 1000 r / min. The photocatalytic degradation effect was good under different ofloxacin concentrations. Detailed experimental data are shown in Table 2. The experimental conditions in Figure (b) were an ofloxacin concentration of 9 mg / L and a stirring rate of 1000 r / min. The photocatalytic effect was affected by different catalyst concentrations. Detailed experimental data are shown in Table 3.

[0080] Table 2. Photocatalytic treatment data under different ofloxacin (OFX) concentrations.

[0081]

[0082] Table 3. Photocatalytic treatment data under different catalyst concentrations (Ccat.).

[0083]

[0084] As shown in Table 2, when the catalyst concentration is 1 g / L, even with an ofloxacin concentration as high as 12 mg / L, the ofloxacin removal rate is still over 94% after 25 minutes of illumination. As shown in Table 3, when the catalyst concentration is 1.5 g / L, the ofloxacin removal rate is over 95% after 15 minutes of illumination, indicating that the photocatalytic reaction device using LED light source 4 can achieve good treatment results.

[0085] The foregoing has described specific embodiments of this specification; other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than those shown in the embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily have to follow the specific or sequential order shown to achieve the desired result. The various embodiments in this specification are described in a progressive manner; similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0086] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0087] The above description is merely an embodiment of this specification and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A photocatalytic reaction device, characterized in that, include: A base, on which a heating module is mounted; The reaction device body includes a light shield, a transparent container, a reaction tube assembly, and a light source. The light shield is mounted on a base and has an installation space. The transparent container is located within the installation space and has a hollow cavity with a first opening at the top for storing a heat-conducting medium. The reaction tube assembly is disposed within the transparent container and includes multiple reaction tubes, all of which are located close to the inner wall of the transparent container. The light source is located on the inner wall of the light shield. The heating plate of the heating module is in contact with the transparent container.

2. The photocatalytic reaction device according to claim 1, characterized in that, The outer side of the light shield is provided with a jacket, and the jacket is provided with a first cooling medium inlet and a first cooling medium outlet that can communicate with the cooling medium.

3. The photocatalytic reaction device according to claim 1, characterized in that, Also includes: A first sealing element is disposed at the first opening. The first sealing element has multiple first through holes, and the reaction tube passes through the first through holes.

4. The photocatalytic reaction device according to claim 1, characterized in that, The light source is either spirally wound or vertically arranged along the axis of the light shield.

5. The photocatalytic reaction device according to claim 3, characterized in that, The first sealing component is provided with a second through hole or a third through hole; the second through hole includes a thermocouple through hole and a steam outlet, and the third through hole includes a second cooling medium inlet and a second cooling medium outlet.

6. The photocatalytic reaction device according to claim 1, characterized in that, The top of the light-shielding cover is provided with a second opening, and the photocatalytic reaction device further includes: The second sealing element is disposed at the second opening, and the second sealing element has a fourth through hole.

7. The photocatalytic reaction device according to claim 1, characterized in that, The photocatalytic reaction device also includes a stirring element disposed inside the reaction tube, and the base includes a speed control module for controlling the speed of the stirring element.

8. The photocatalytic reaction device according to claim 1, characterized in that, The bottom of the light shield is provided with a heat insulation device, which is located between the light shield and the heating plate.

9. The photocatalytic reaction apparatus according to any one of claims 1-8, characterized in that, The distance between the light source and the transparent container is 0-2cm.

10. The photocatalytic reaction apparatus according to any one of claims 1-8, characterized in that, The reaction tube and the transparent container are made of quartz.

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