Photocatalysis and electrochemical coupling sulfur hexafluoride degradation device

Abstract

The invention discloses a photocatalytic and electrochemical coupled sulfur hexafluoride degradation device, and relates to the technical field, the photocatalytic and electrochemical coupled sulfur hexafluoride degradation device comprises an electrochemical assembly and a photochemical assembly, the electrochemical assembly comprises a power supply, a cathode piece, an anode piece, a first container and a second container, and the cathode piece and the anode piece are respectively located in the first container and the second container and are connected with the power supply; and the first container is communicated with the second container. The photochemical assembly comprises a photoreaction container, a photocatalyst and a light source, a photoreaction cavity is formed in the photoreaction container, an outlet of the photoreaction cavity is communicated with the first container, the light source and the photocatalyst are both located in the photoreaction cavity, and ultraviolet light emitted by the light source can perform photoreaction degradation on sulfur hexafluoride entering the photoreaction cavity under catalysis of the photocatalyst. Sulfur hexafluoride is degraded for multiple times through the electrochemical assembly and the photochemical assembly, and the pollution degree of finally degraded and discharged gas is low.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas degradation, and in particular to a photocatalytic and electrochemically coupled sulfur hexafluoride degradation device. Background Art

[0002] Sulfur hexafluoride has excellent insulation and arc extinguishing properties and is widely used in electrical equipment. However, SF6 is a strong greenhouse gas with an extremely high greenhouse effect potential (GWP), about 23,500 times that of carbon dioxide. It is extremely stable in the atmosphere and can exist for a long time, which has a significant impact on global warming. Therefore, the development of efficient SF6 degradation methods and devices is of great significance to environmental protection.

[0003] The prior art with the announcement number CN118320586A discloses an electrochemical device for degrading sulfur hexafluoride waste gas, including an electrolytic cell and two washing components, including a cathode area, an anode area and a cation exchange membrane separating the cathode area and the anode area, wherein a cathode is provided in the cathode area, an anode is provided in the anode area, and the cathode and the anode are respectively electrically connected to the negative electrode and the positive electrode of a DC power supply; the washing component includes a washing column and a spray component, wherein the two washing columns are respectively connected to the cathode area and the anode area, the washing column in the cathode area is connected to the anode area through a gas pipeline, the spray component connects the washing column and the cathode area or the anode area, and the spray component is used to extract electrolyte and spray it into the washing column. The present application can perform countercurrent washing on the SF6 and other intermediate gas products that have escaped or not completely degraded, thereby achieving deep degradation of SF6.

[0004] However, the prior art still has some shortcomings. For example, the electrochemical device only degrades sulfur hexafluoride through electrochemical reaction, and the degradation capacity is limited. Finally, the gas discharged after degradation still contains gas with a high degree of pollution. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a photocatalytic and electrochemically coupled sulfur hexafluoride degradation device to solve the technical problems that the electrochemical device in the prior art only degrades sulfur hexafluoride by electrochemical reaction, has limited degradation capacity, and finally the gas discharged after degradation still has residual gas with a high degree of pollution.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a photocatalytic and electrochemical coupled sulfur hexafluoride degradation device, comprising: An electrochemical component, comprising a power source, a cathode member, an anode member, a first container and a second container, wherein the cathode member and the anode member are respectively located in the first container and the second container and connected to the power source, and the first container is in communication with the second container; and A photochemical component comprises a photoreaction container, a photocatalyst and a light source. A photoreaction chamber is arranged in the photoreaction container, an outlet of the photoreaction chamber is connected to the first container, the light source and the photocatalyst are both located in the photoreaction chamber, and ultraviolet light emitted by the light source can photoreact and degrade sulfur hexafluoride entering the photoreaction chamber under the catalysis of the photocatalyst.

[0007] In some embodiments, the photoreaction container is located inside the first container, and a receiving cavity for containing electrolyte is formed between the outer wall circumference of the photoreaction container and the inner wall circumference of the first container.

[0008] In some embodiments, the photochemical component further includes an aeration head, and the aeration head is disposed at the outlet of the photoreaction chamber, and the outlet of the photoreaction chamber is disposed at the bottom of the accommodating chamber.

[0009] In some embodiments, the photochemical component further comprises a plurality of transparent partitions, which are arranged in a staggered manner in the photoreaction chamber to form a continuous arcuate channel, and the arcuate channel is connected to the outlet of the photoreaction chamber.

[0010] In some embodiments, the photocatalyst and the light source are disposed on opposite sides of the transparent partition.

[0011] In some embodiments, the electrochemical component further includes a connecting container and a cation exchange membrane, wherein both ends of the connecting container are connected to the first container and the second container, and the cation exchange membrane is located in the connecting container and isolates the first container and the second container.

[0012] In some embodiments, the photochemical components have two groups, one of which is located in the first container, and the other is located in the second container and connected to the gas outlet of the first container through a connecting tube.

[0013] In some embodiments, the photocatalytic and electrochemically coupled sulfur hexafluoride degradation device also includes an exhaust gas detection component, which includes a concentration detector, a three-way valve and an exhaust gas treatment component. The concentration detector is connected to the outlet of the second container and the three-way valve, and the three-way valve is connected to the exhaust gas treatment component.

[0014] In some embodiments, the tail gas treatment component includes an alkali liquid absorption tower and an adsorbent filler, the adsorbent filler is located in the alkali liquid absorption tower, the alkali liquid absorption tower has a sodium hydroxide solution, and the adsorbent filler is activated alumina.

[0015] In some embodiments, the photocatalytic and electrochemically coupled sulfur hexafluoride degradation device also includes a sulfur hexafluoride gas cylinder, an inert gas cylinder and a confluence pipe, wherein the sulfur hexafluoride gas cylinder and the inert gas cylinder are connected to one end of the confluence pipe, and the other end of the confluence pipe is connected to the inlet of the photoreaction container.

[0016] Compared with the prior art, the photocatalytic and electrochemically coupled sulfur hexafluoride degradation device provided by the present invention has a light reaction chamber that can be connected to the sulfur hexafluoride to be degraded. After the sulfur hexafluoride enters the light reaction chamber, a photocatalytic degradation reaction is performed on the sulfur hexafluoride to degrade the sulfur hexafluoride into secondary polluted gas. The gas then flows into the first container and undergoes an electrochemical reaction with the electrolyte and cathode of the first container to degrade the gas again, so that the gas is degraded into a gas with a lower degree of pollution. Since the first container is connected to the second container, the gas can enter the second container again and undergo an electrochemical reaction with the electrolyte and anode of the second container to degrade the gas again. The present invention degrades sulfur hexafluoride multiple times by using electrochemical components and photochemical components together, and the pollution level of the gas discharged from the final degradation is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a photocatalytic and electrochemically coupled sulfur hexafluoride degradation device provided in an embodiment of the present invention; Figure 2 It is a schematic top view of a first container provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem that the electrochemical device in the prior art degrades sulfur hexafluoride only by electrochemical reaction, the degradation capacity is limited, and the gas discharged after degradation still has residual gas with a high degree of pollution, the present invention provides a photocatalytic and electrochemical coupled sulfur hexafluoride degradation device, which can realize multiple degradation of sulfur hexafluoride by electrochemical components and photochemical components, and the pollution level of the gas discharged after degradation is low.

[0020] See also Figure 1 , Figure 11 is a schematic structural diagram of a photocatalytic and electrochemically coupled sulfur hexafluoride degradation device in one embodiment of the present invention. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device includes an electrochemical component and a photochemical component. The electrochemical component includes a power supply 1, a cathode component 2, an anode component 3, a first container 4 and a second container 5. The cathode component 2 and the anode component 3 are respectively located in the first container 4 and the second container 5, and are connected to the positive and negative electrodes of the power supply 1. The first container 4 is connected to the second container 5.

[0021] The photochemical component includes a photoreaction container 6 and a light source 7. A photoreaction chamber 61 is provided in the photoreaction container 6. The outlet of the photoreaction chamber 61 is connected to the first container 4. The light source 7 is located in the photoreaction chamber 61 and is used to emit ultraviolet light to irradiate the sulfur hexafluoride entering the photoreaction chamber 61. The light source 7 includes a lamp post 71 and a light strip 72 ( Figure 2 As shown), the lamp post 71 can emit light in all directions at 360°, and the light strip 72 can assist in emitting light to enhance the lighting.

[0022] The photoreaction container 6 of this embodiment is used to connect the sulfur hexafluoride to be treated. When the sulfur hexafluoride flows into the photoreaction chamber 61 of the photoreaction container 6, the light source 7 can emit ultraviolet light to perform a photocatalytic degradation reaction on the sulfur hexafluoride in the photoreaction chamber 61, so as to degrade the sulfur hexafluoride into secondary polluted gas. The secondary polluted gas then flows into the first container 4, and undergoes an electrochemical reaction with the electrolyte and the cathode component 2 of the first container 4 to degrade the gas again, so that the gas is degraded into a gas with a lower degree of pollution. Since the first container 4 is connected to the second container 5, the gas can enter the second container 5 again, and undergo an electrochemical reaction with the electrolyte and the anode component 3 of the second container 5 to degrade the gas again. The present invention degrades sulfur hexafluoride multiple times by using electrochemical components and photochemical components together, and the gas discharged from the final degradation has a low degree of pollution and will not cause a significant impact on the environment.

[0023] The cathode component 2 is preferably a nano-copper impregnated carbon fiber modified electrode, which has unique physical and chemical properties and can significantly improve the efficiency of the electrochemical reaction. The anode component 3 is preferably a platinum electrode, whose good conductivity and chemical inertness help maintain the stability of the anode reaction.

[0024] In one embodiment, see Figure 1 , the photoreaction container 6 is located inside the first container 4, and a receiving chamber 41 for receiving the electrolyte is formed between the outer wall of the photoreaction container 6 and the inner wall of the first container 4. In this embodiment, the photoreaction container 6 is located inside the first container 4 to save space. The electrolyte 411 in the receiving chamber 41 is an alkaline solution, such as potassium hydroxide or sodium hydroxide.

[0025] In one embodiment, see Figure 1The photochemical component further includes an aeration head 8, which is disposed at the outlet of the photoreaction chamber 61, and the outlet of the photoreaction chamber 61 is disposed near the bottom of the accommodating chamber 41. In this embodiment, the aeration head 8 is provided to allow the gas generated by the reaction in the photoreaction chamber 61 and the residual sulfur hexafluoride to fully enter the accommodating chamber 41 to contact the alkaline solution, further increasing the gas-liquid contact area and improving the reaction efficiency.

[0026] In one embodiment, see Figure 1 and Figure 2 The photochemical assembly further includes a plurality of transparent partitions 62, which are arranged at staggered intervals in the photoreaction chamber 61 and form a continuous arcuate channel 63, which is connected to the outlet of the photoreaction chamber 61. In this embodiment, the light source 7 is arranged on one of the transparent partitions 62, or a plurality of light sources 7 can be arranged, and each transparent partition 62 is provided with a light source 7, and the light source 7 can emit ultraviolet light to irradiate sulfur hexafluoride to decompose sulfur hexafluoride.

[0027] For further information, see Figure 2 The photochemical component also includes a photocatalyst 9, and the photocatalyst 9 and the light strip 72 are arranged on opposite sides of the transparent partition 62. In this embodiment, the photocatalyst 9 can be used to improve the decomposition efficiency of sulfur hexafluoride. The photocatalyst 9 in this embodiment is polyisoprene nanoparticles. The polyisoprene nanoparticles are loaded on activated carbon fibers, which are porous carrier materials. The activated carbon fibers are then installed on the other side of the transparent partition 62 of the photoreaction chamber to increase the contact area between the photocatalyst and sulfur hexafluoride and improve the photocatalytic efficiency. Under ultraviolet light, the polyisoprene nanoparticles generate reducing free radicals (mainly allyl free radicals and excited C=C bonds) through double bond breakage, hydrogen extraction and chain breakage paths. R is an allyl radical, R1 is an excited C=C bond, and all decomposition products produced are SO2F2, SiF4, SF4, SiH4, HF and SO2, etc.

[0028] In one embodiment, see Figure 1, the electrochemical component also includes a connecting container 10 and a cation exchange membrane 11, the two ends of the connecting container 10 are connected to the first container 4 and the second container 5, and the cation exchange membrane 11 is located in the connecting container 10 and isolates the first container 4 and the second container 5. In this embodiment, the cation exchange membrane is a Nafion117 type cation exchange membrane, which has high selectivity and good ion conductivity, and can effectively realize the separation and transmission of ions. The cathode component 2 and the anode component 3 are connected to the negative electrode and the positive electrode of the power supply 1 through wires, respectively. This connection method allows electrons to flow smoothly between the cathode component 2 and the power supply 1 during the electrochemical reaction, thereby driving the redox reaction. In addition, the power supply 1 is a DC regulated power supply with the function of adjusting voltage and current. This feature enables the electrochemical system to flexibly adjust the voltage and current parameters according to different reaction conditions and requirements. By accurately controlling the voltage and current, the reaction rate and product selectivity can be optimized, and the performance and efficiency of the entire device can be improved.

[0029] In one embodiment, see Figure 1 , the photochemical components have two groups, one of which is located in the first container 4, and the other is located in the second container 5, and is connected to the gas outlet of the first container 4 through the connecting pipe 12. In this embodiment, the gas generated after the sulfur hexafluoride reacts in the first container 4 can enter the photochemical components of the second container 5 through the connecting pipe 12, and the photocatalytic reaction occurs again to degrade the gas again. The gas generated after degradation is aerated by the aeration head and fully contacts with the electrolyte inside the second container, thereby improving the reaction efficiency. A control valve 121 is provided on the connecting pipe 12, and the control valve 121 is used to control the on-off of the connecting pipe 12 to control whether the gas generated by the reaction in the first container 5 enters the second container 6 or not.

[0030] The electrolyte 51 in the second container 5 is a sulfuric acid solution containing silver ions, and the silver ions undergo oxidation reaction in the anode reaction to generate corresponding products. The selection and configuration of this electrolyte is based on a deep understanding of the electrochemical reaction mechanism and optimized design, aiming to achieve an efficient sulfur hexafluoride degradation process.

[0031] In one embodiment, see Figure 1, the photocatalytic and electrochemically coupled sulfur hexafluoride degradation device also includes a tail gas detection component, which includes a concentration detector 13, a three-way valve 14, a tail gas treatment component 15 and an alarm 21. The concentration detector 13 is connected to the outlet of the second container 5 and the three-way valve 14, the three-way valve 14 is connected to the tail gas treatment component 15, and the alarm 21 is connected to the concentration detector 13. In this embodiment, the tail gas detection component can be used to detect whether there are still more harmful gases in the tail gas after sulfur hexafluoride is treated by photocatalysis and electrochemistry. The concentration detector 13 is used to detect the concentration of harmful gases. When the concentration of harmful gases exceeds the standard, the alarm 21 sounds an alarm, and the three-way valve 14 controls the switch direction so that the tail gas flows into the tail gas treatment component 15 to absorb the tail gas and avoid the tail gas from polluting the air. When the concentration detector 13 detects that the harmful gases in the tail gas do not exceed the standard, the three-way valve 14 controls the direct discharge of the tail gas.

[0032] In one embodiment, see Figure 1 The tail gas treatment part includes an alkali liquid absorption tower 16 and an adsorbent filler 17. The adsorbent filler 17 is located in the alkali liquid absorption tower 16. The alkali liquid absorption tower 16 has a sodium hydroxide solution, and the adsorbent filler 17 is activated alumina. In this embodiment, the sodium hydroxide solution is used to absorb acidic gases in the tail gas after the reaction, such as sulfur dioxide, hydrogen fluoride, etc. The adsorbent bed is filled with activated alumina to further absorb the residual harmful gases to ensure that the tail gas meets the emission standards.

[0033] In one embodiment, see Figure 1 The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device also includes a sulfur hexafluoride gas cylinder 18, an inert gas cylinder 19 and a confluence pipe 20. The sulfur hexafluoride gas cylinder 18 and the inert gas cylinder 19 are connected to one end of the confluence pipe 20, and the other end of the confluence pipe 20 is connected to the inlet of the photoreaction container 6. In this embodiment, the sulfur hexafluoride gas cylinder 18 stores sulfur hexafluoride, and the inert gas cylinder 19 stores helium. The sulfur hexafluoride and the helium enter the confluence pipe 20 together to mix, and then enter the photoreaction container 6 together to perform a photocatalytic reaction. The line connecting the sulfur hexafluoride gas cylinder 18 to the confluence pipe 20 is sequentially provided with a first pressure reducing valve 181, a first flow meter 182 and a first solenoid valve 183. The first pressure reducing valve 181 can be used to adjust the gas pressure of the sulfur hexafluoride gas cylinder 18, the first flow meter 182 can adjust the output speed of sulfur hexafluoride, and the first solenoid valve 183 can control whether sulfur hexafluoride is output or not.

[0034] A second pressure reducing valve 191, a second flow meter 192 and a second solenoid valve 193 are sequentially arranged on the line connecting the inert gas bottle 19 to the confluence pipe 20. The second pressure reducing valve 191 can be used to adjust the gas pressure of the inert gas bottle 19, the second flow meter 192 can adjust the output speed of helium, and the second solenoid valve 193 can control the output of helium or not.

[0035] The confluence pipe 20 is provided with a main solenoid valve 201 , which can be used to control whether the mixed gas of sulfur hexafluoride and helium enters into the photoreaction container 6 or not.

[0036] In order to better understand the present invention, the following Figure 1 The technical solution of the present invention is described in detail: Using the photocatalytic and electrochemically coupled sulfur hexafluoride degradation device provided by the present invention, at the gas supply source, the sulfur hexafluoride gas cylinder 18 and the inert gas cylinder 19 store sulfur hexafluoride and helium respectively, and the first flowmeter 182 and the second flowmeter 192 accurately control the flow of the two, so that sulfur hexafluoride and helium are initially mixed in a certain proportion through the pipeline and then transported to the gas inlet of the photoreaction container 6. Before the gas is introduced, the power supply 1 is turned on, the working voltage is set to 4.0V, and the gas is started after waiting for ten minutes. The initial intake flow rate of sulfur hexafluoride is controlled to 8ml / min, and the initial intake flow rate of helium is controlled to 800ml / min, and the gas undergoes photocatalytic and electrochemical coupling reactions.

[0037] After the mixed gas undergoes a photocatalytic reaction in the photoreaction container 6, the sulfur hexafluoride molecules are gradually decomposed into more easily degradable substances such as SO2F2, SiF4, SF4, SiH4, HF and SO2.

[0038] In the electrochemical system, the cathode component 2 of the first container 4 uses a nano-copper impregnated carbon fiber modified electrode 11, the anode component 3 of the second container 5 uses a platinum electrode 13, and a Nafion117 type cation exchange membrane 11 is installed between the first container 4 and the second container 5. The cathode component 2 and the anode component 3 are respectively connected to the negative electrode and the positive electrode of the DC voltage-stabilized power supply 1. The power supply 1 can adjust the voltage and current. By accurately controlling the voltage and current, the reaction rate and product selectivity can be optimized. The electrolyte of the first container 4 is a potassium hydroxide solution 41, and the electrolyte of the second container 5 is a sulfuric acid solution 51 containing silver ions. After the electrochemical reaction, the sulfur hexafluoride waste gas and the intermediate products that are not completely degraded by the photocatalytic reaction are further degraded; some of the intermediate products that are not degraded enter the photocatalytic component of the second container 5 and are degraded again. Then, the intermediate product is degraded again in the second container 5, and the degraded product enters the concentration detector. According to the detection, under this working condition, the final outgas sulfur hexafluoride degradation rate reaches 95%, and the degradation effect can be maintained stably within eight hours of continuous reaction, and the tail gas is basically free of toxic and harmful gases such as sulfur dioxide and hydrogen fluoride. If the concentration of sulfur hexafluoride in the tail gas is too high, the intake amount of helium can be appropriately increased.

[0039] After running for a period of time, the concentration detector 13 finds that the degradation effect of sulfur hexafluoride is slightly reduced, and the alarm 21 sounds an alarm. The operator adjusts the voltage and current in time to optimize the reaction conditions.

[0040] Electrocatalytic reaction: The chemical reaction occurring in the first container is: 6X + +3SF6+12HO2 - +3H2O→6X 2+ +SOF2↑+SO2↑+6OF2↑+SF4↑+18OH - X may be Ni, Co or Cu.

[0041] The chemical reaction occurring in the second container is: 6Ag 2+ +SF4+SOF2+SO2+9H2O→6Ag + +3SO4 2- +6HF+12H + 6OF2+6H2O→12HF+6O2↑ The overall reaction equation for the electrocatalytic degradation of sulfur hexafluoride is as follows: 3SF6+12HO2 - +6H + →3SO4 2- +18HF+6O2↑.

[0042] The above embodiments are only partial examples of the present invention. In practical applications, the device parameters can be adjusted according to specific circumstances to achieve the best degradation effect.

[0043] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A photocatalytic and electrochemical coupled sulfur hexafluoride degradation device, characterized in that: include: An electrochemical component, comprising a power source, a cathode member, an anode member, a first container and a second container, wherein the cathode member and the anode member are respectively located in the first container and the second container and connected to the power source, and the first container is in communication with the second container; and A photochemical component comprises a photoreaction container, a photocatalyst and a light source. A photoreaction chamber is arranged in the photoreaction container, an outlet of the photoreaction chamber is connected to the first container, the light source and the photocatalyst are both located in the photoreaction chamber, and ultraviolet light emitted by the light source can photoreact and degrade sulfur hexafluoride entering the photoreaction chamber under the catalysis of the photocatalyst.

2. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 1, characterized in that: The photoreaction container is located inside the first container, and a receiving cavity for receiving electrolyte is formed between the outer wall circumference of the photoreaction container and the inner wall circumference of the first container.

3. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 2, characterized in that: The photochemical component further comprises an aeration head, which is arranged at the outlet of the photoreaction chamber, and the outlet of the photoreaction chamber is arranged at the bottom of the accommodating chamber.

4. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 3, characterized in that: The photochemical component further comprises a plurality of transparent partitions, which are arranged in a staggered manner in the photoreaction chamber to form a continuous arcuate channel, and the arcuate channel is connected to the outlet of the photoreaction chamber.

5. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 4, characterized in that: The photocatalyst and the light source are arranged on opposite sides of the transparent partition.

6. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 1, characterized in that: The electrochemical component further includes a connecting container and a cation exchange membrane. The two ends of the connecting container are connected to the first container and the second container. The cation exchange membrane is located in the connecting container and isolates the first container and the second container.

7. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 1, characterized in that: The photochemical components have two groups, one of which is located in the first container, and the other is located in the second container and is connected to the gas outlet of the first container through a connecting pipe.

8. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 1, characterized in that: The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device also includes a tail gas detection component, which includes a concentration detector, a three-way valve and a tail gas treatment component. The concentration detector is connected to the outlet of the second container and the three-way valve, and the three-way valve is connected to the tail gas treatment component.

9. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 8, characterized in that: The tail gas treatment component comprises an alkali liquid absorption tower and an adsorbent filler, wherein the adsorbent filler is located in the alkali liquid absorption tower, the alkali liquid absorption tower has a sodium hydroxide solution, and the adsorbent filler is activated alumina.

10. The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device according to claim 1, characterized in that: The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device also includes a sulfur hexafluoride gas cylinder, an inert gas cylinder and a confluence pipe, wherein the sulfur hexafluoride gas cylinder and the inert gas cylinder are connected to one end of the confluence pipe, and the other end of the confluence pipe is connected to the inlet of the photoreaction container.

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