A method for regulating the content of active substances in plasma-activated water by using a catalyst in conjunction with plasma

Abstract

The present application relates to a kind of catalyst synergistic plasma to regulate the method of active substance content in plasma activated water, belong to plasma activated water preparation technical field.The present application uses catalyst synergistic plasma to prepare the device of activated water, catalyst is filled in the discharge region of dielectric barrier discharge plasma jet device, the working gas flow of inlet pipe is adjusted by mass flowmeter, low-temperature plasma power is powered to high-voltage electrode, working gas starts discharge to generate plasma in discharge region, while, under the coupling catalysis of catalyst, the content of active substance in plasma is improved, the water body in plasma active substance activated water storage container is activated, and plasma activated water is formed;The content of active substance in plasma activated water is regulated by changing catalyst type and the component of working gas in gas cylinder.The present application improves the content of active substance in plasma working gas by catalyst coupling plasma, and the content of active substance in plasma activated water is improved.

Description

Technical Field

[0001] This invention relates to a method for regulating the content of active substances in plasma-activated water by using a catalyst in conjunction with plasma, belonging to the field of plasma-activated water preparation technology. Background Technology

[0002] Plasma-activated water is a substance composed of water and plasma. It involves activating the aqueous phase by introducing active substances generated from the ionization of a gas into the water. During the activation process, a large number of active particles, such as H+, are generated in both the gas and liquid phases. + O3, -OH, NO - NO - 2. These particles undergo a series of chemical reactions in water, generating substances such as hydrogen peroxide, nitric acid, and nitrite; thus, plasma-activated water has the effects of disinfection, sterilization, stimulating seed germination, and promoting plant growth.

[0003] Existing plasma-activated water preparation technologies mainly include direct plasma treatment and indirect plasma treatment. Compared to indirect plasma treatment, activated water produced by direct plasma treatment has relatively higher levels of reactive nitrogen and reactive oxygen species. However, even when activated water from direct plasma treatment is used as a fertilizer to promote growth, its reactive nitrogen content remains below 7600 ug / L (NOx). - 2 and NO - (The sum of 3). Summary of the Invention

[0004] To address the problem of low active substance content in plasma-activated water in existing technologies, this invention proposes a method for regulating the active substance content in plasma-activated water using a catalyst-coordinated plasma approach. The method employs a catalyst-coordinated plasma device for preparing activated water. A catalyst is filled into the discharge region of a dielectric barrier discharge plasma jet device. The working airflow in the inlet pipe is adjusted by a mass flow meter. A low-temperature plasma power supply powers the high-voltage electrode, causing the working gas in the discharge region to discharge and generate plasma. Simultaneously, under the coupled catalytic effect of the catalyst, the active substance content in the plasma is increased. The plasma active substances activate the water in the storage container, forming plasma-activated water. The active substance content in the plasma-activated water can be regulated by changing the catalyst type and the composition of the working gas in the gas cylinder.

[0005] A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, and an apparatus for preparing activated water using catalyst-coordinated plasma, the apparatus comprising a low-temperature plasma power supply, a dielectric barrier discharge plasma jet device, a water storage container, and a gas cylinder, wherein the dielectric barrier discharge plasma jet device comprises a high-voltage electrode, a quartz tube, and a low-voltage electrode, the top of the quartz tube being provided with a sealing plug, and the bottom of the quartz tube being a conical structure with an open bottom end, the conical structure of the quartz tube being inserted into the water storage container, a grid baffle being provided above the conical structure of the quartz tube, the grid baffle being filled with catalyst, a positioning through hole being provided in the center of the grid baffle, the high-voltage electrode passing through the center of the sealing plug at the top of the quartz tube and vertically inserted downward into the positioning through hole of the grid baffle, the top of the high-voltage electrode being connected to the low-temperature plasma power supply, the low-voltage electrode being sleeved on the outer wall of the quartz tube and grounded, a gas inlet being provided at the top of the quartz tube, the gas inlet being connected to the gas cylinder through an inlet pipe, and a mass flow meter being provided on the inlet pipe;

[0006] The quartz tube cavity between the bottom and top of the low-pressure electrode is the discharge region, and the catalyst is filled in the discharge region; the gas cylinder is filled with working gas.

[0007] The specific steps of the method are as follows:

[0008] (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with catalyst, then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward.

[0009] (2) Fill the water storage container with water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0010] (3) The airflow in the inlet pipe is adjusted by the mass flow meter, the low temperature plasma power supply is energized to the high voltage electrode, the working gas in the discharge area begins to discharge and generate plasma, and at the same time, the content of active substances in the plasma is increased under the coupled catalytic effect of the catalyst. The plasma active substances activate the water in the water storage container to form plasma activated water.

[0011] (4) The content of active substances in plasma-activated water can be controlled by changing the catalyst type and the composition of the working gas in the gas cylinder.

[0012] The working gas is one or more of air, nitrogen, argon, and oxygen.

[0013] The catalyst is a transition metal catalyst, a metal nitride catalyst, or a metal oxide catalyst.

[0014] The principle of catalyst-assisted plasma catalysis:

[0015] Plasma, by establishing an electric field and altering the gas composition, transfers various active species, electrons, and photons to the plasma-catalyst interaction surface. Simultaneously, the catalyst influences the reaction surface by lowering the activation barrier of the reaction. Furthermore, plasma and catalyst are interdependent; plasma affects the properties of the catalyst, and the catalyst affects the properties of the plasma. By coupling plasma with the catalyst, the content of active substances in the plasma working gas is increased, thereby increasing the content of active substances in the plasma-activated water.

[0016] The beneficial effects of this invention are:

[0017] (1) This invention increases the content of active substances in plasma working gas by catalyst coupling with plasma, thereby increasing the content of active substances in plasma-activated water; and the content of active substances in plasma-activated water can be controlled by changing the type of catalyst, thus expanding the application field of plasma-activated water.

[0018] (2) The device for preparing activated water by catalyst-co-plasma in this invention directly treats water with plasma, so that short-lived active substances can be quickly introduced into the water. It has the advantages of simple equipment, convenient process flow, and control of active substance composition and content in plasma-activated water.

[0019] (3) In this invention, the active species generated by plasma directly enter the water, avoiding the loss of a large amount of active substances during mass transfer. This improves the energy utilization efficiency of plasma, enhances the mass transfer effect, and increases the content of active substances in the activated water.

[0020] (4) The present invention can freely change the working gas to produce activated water containing different proportions of active substances, so that it can be applied in different scenarios. Attached Figure Description

[0021] Figure 1 A schematic diagram of the apparatus for preparing activated water using catalyst-co-plasma.

[0022] Figure 2 The content of active substances in plasma-activated water in Example 1 and Comparative Example 1;

[0023] Figure 3 This is a comparison of the H2O2 content of active substances in plasma-activated water between Example 1 and the comparative example.

[0024] Figure 4 Example 1: MnCe 0.1 O x XRD patterns before and after the catalyst reaction;

[0025] Figure 5 Example 2: The content of active substances in plasma-activated water;

[0026] Figure 6 This is a comparison of the content of active substances in plasma-activated water in Example 2 and the comparative example.

[0027] Figure 7 Example 2 MnLa 0.1 O x XRD patterns before and after the catalyst reaction. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0029] Overview of the Invention

[0030] The apparatus for preparing activated water by catalyst-co-plasma includes a low-temperature plasma power supply, a dielectric barrier discharge plasma jet device, a water storage container, and a gas cylinder. The dielectric barrier discharge plasma jet device includes a high-voltage electrode, a quartz tube, and a low-voltage electrode. The top of the quartz tube is equipped with a sealing plug, and the bottom of the quartz tube is a conical structure with an open bottom. The conical structure of the quartz tube is inserted into the water storage container. A grid baffle is set above the conical structure of the quartz tube, and the grid baffle is filled with catalyst. A positioning through hole is opened in the center of the grid baffle. The high-voltage electrode passes through the center of the sealing plug at the top of the quartz tube and is vertically inserted into the positioning through hole of the grid baffle. The top of the high-voltage electrode is connected to the low-temperature plasma power supply. The low-voltage electrode is sleeved on the outer wall of the quartz tube and is grounded. A gas inlet is opened at the top of the quartz tube, and the gas inlet is connected to the gas cylinder through an inlet pipe. A mass flow meter is installed on the inlet pipe.

[0031] The quartz tube cavity between the bottom and top of the low-pressure electrode is the discharge region, and the catalyst is filled in the discharge region; the gas cylinder is filled with working gas.

[0032] A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, and an apparatus for preparing activated water using catalyst-coordinated plasma, the specific steps of which are as follows:

[0033] (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with catalyst, then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward.

[0034] (2) Fill the water storage container with water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0035] (3) The airflow in the inlet pipe is adjusted by the mass flow meter, the low temperature plasma power supply is energized to the high voltage electrode, the working gas in the discharge area begins to discharge and generate plasma, and at the same time, the content of active substances in the plasma is increased under the coupled catalytic effect of the catalyst. The plasma active substances activate the water in the water storage container to form plasma activated water.

[0036] (4) The content of active substances in plasma-activated water can be controlled by changing the catalyst type and the composition of the working gas in the gas cylinder.

[0037] The working gas is one or more of air, nitrogen, argon, and oxygen.

[0038] The catalyst is a transition metal catalyst, a metal nitride catalyst, or a metal oxide catalyst.

[0039] Preferably, the active component of the transition metal catalyst is one or more of Ru, Fe, Co, and Mo, and the support is a metal oxide such as Al2O3, Y2O3, SiO2, La2O3, CeO2, ZnO, TiO2, or ZrO2; the transition metal catalyst can be prepared by impregnation method.

[0040] Preferably, the metal nitride catalyst is Co3Mo3N, Mo2N, W2N or Fe2N; the metal nitride catalyst can be prepared by the sol-gel method.

[0041] Preferably, the metal oxide catalyst is MnCe. 0.1 O x MnLa 0.1 O x The catalyst may be Co2O3 or NiO, wherein 1.1 ≤ x ≤ 2.1; the metal oxide catalyst may be prepared by sol-gel method.

[0042] Example 1: A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, employing an apparatus for preparing activated water using catalyst-coordinated plasma, and the specific steps of the method are as follows:

[0043] (1) Place the grid baffle above the conical structure of the quartz tube, vertically insert the high-voltage electrode into the quartz tube and insert the bottom end of the high-voltage electrode into the positioning through hole of the grid baffle, and fill the grid baffle with 0.5g of catalyst (MnCe prepared by conventional sol-gel method). 0.1 O xCatalyst, 1.1≤x≤2.1), then seal the top of the quartz tube with a sealing plug and pass the top of the high-voltage electrode upward through the sealing plug;

[0044] (2) Fill the water storage container with deionized water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0045] (3) Adjust the airflow in the inlet pipe to 30 ml / min using a mass flow meter. Power the high-voltage electrode with the low-temperature plasma power supply for 10 minutes. In the discharge region, the working gas is air, and plasma generation begins. Simultaneously, in the catalyst (MnCe)... 0.1 O x The content of active substances in the plasma is increased under the coupled catalytic action of the catalyst. The active substances in the plasma activate the water in the water storage container to form plasma-activated water.

[0046] Comparative Example 1: The difference between this comparative example and Example 1 is that no catalyst is filled on the mesh baffle;

[0047] A colorimetric reagent was added to both the plasma-activated water of Example 1 and Comparative Example 1. The contents of hydrogen peroxide, nitrate, and nitrite were measured using a UV-Vis spectrophotometer. Figure 2 ,from Figure 2 It can be seen that in Example 1, the catalyst (MnCe) 0.1 O x The nitrite content in plasma-activated water formed under the coupled catalytic action of the catalyst (MnCe) reached over 3640 ug / L, while the nitrite content in plasma-activated water generated by pure plasma in Comparative Example 1 was 3310 ug / L. 0.1 O x Catalyst-coupled plasma can significantly increase the amount of nitrite, an active substance in plasma-activated water; in Example 1, the increase in nitrite was 3577.8 ug / L compared to Comparative Example 1; the total active nitrogen content increased by 3907.8 ug / L in the case of catalyst coupling, and the total active nitrogen content in activated water was significantly increased in the case of catalyst coupling.

[0048] The comparison of the H2O2 content of active substances in plasma-activated water between Example 1 and Comparative Example 1 is shown in the figure. Figure 3 ,from Figure 3 It can be seen that in Example 1, the catalyst (MnCe) 0.1 O x The plasma-activated water containing hydrogen peroxide, formed under the coupled catalytic action of the catalyst, increased by an average of about one-quarter compared to Comparative Example 1.

[0049] Example 1 MnCe 0.1 O x XRD patterns before and after the catalyst reaction are shown in the figure. Figure 4 ,from Figure 4 It can be seen that the XRD pattern still maintains the Mn2O3 phase after participating in the plasma discharge reaction with a power of 24W, indicating that the catalyst is relatively stable in activated water prepared by coupled plasma.

[0050] Example 2: A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, employing an apparatus for preparing activated water using catalyst-coordinated plasma, and the specific steps of the method are as follows:

[0051] (1) Place the grid baffle above the conical structure of the quartz tube, vertically insert the high-voltage electrode into the quartz tube and insert the bottom end of the high-voltage electrode into the positioning through hole of the grid baffle, and fill the grid baffle with 0.5g of catalyst (MnLa prepared by conventional sol-gel method). 0.1 O x Catalyst, 1.1≤x≤2.1), then seal the top of the quartz tube with a sealing plug and pass the top of the high-voltage electrode upward through the sealing plug;

[0052] (2) Fill the water storage container with deionized water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0053] (3) Adjust the airflow in the inlet pipe to 30 ml / min using a mass flow meter. Power the high-voltage electrode with the low-temperature plasma power supply for 10 minutes. In the discharge region, the working gas is air, and plasma generation begins. Simultaneously, in the catalyst (MnLa... 0.1 O x The content of active substances in the plasma is increased under the coupled catalytic action of the catalyst. The active substances in the plasma activate the water in the water storage container to form plasma-activated water.

[0054] Comparative Example 2: The difference between this comparative example and Example 2 is that no catalyst is filled on the mesh baffle;

[0055] A colorimetric reagent was added to both the plasma-activated water of Example 2 and Comparative Example 2. The contents of hydrogen peroxide, nitrate, and nitrite were measured using a UV-Vis spectrophotometer. Figure 5 ,from Figure 5 It can be seen that in Example 2, the catalyst (MnLa) 0.1 O xThe nitrite content in plasma-activated water formed under the coupled catalytic action of the catalyst (MnLa) reached over 5750 ug / L, which is nearly 2000 ug / L higher than that in plasma-activated water generated by pure plasma in Comparative Example 2. 0.1 O x Catalyst-coupled plasma can significantly increase the amount of nitrite, an active substance in plasma-activated water; compared with Comparative Example 2, the nitrite content increased by 6276.7 ug / L in Example 2; the total active nitrogen content increased by 8276.7 ug / L in the case of catalyst coupling, and the total active nitrogen content in plasma-activated water was greatly improved under the synergy of catalyst and plasma.

[0056] The comparison of the H2O2 content of plasma-activated water between Example 2 and Comparative Example 2 is shown in the figure. Figure 6 ,from Figure 3 It can be seen that in the catalyst (MnCe) 0.1 O x The plasma activated by the coupled catalytic action of the catalyst significantly increased the hydrogen peroxide content in the activated water, while from... Figure 6 It can be seen that in the catalyst (MnLa) 0.1 O x The increase in hydrogen peroxide under the coupled catalytic action of the catalyst is lower than that in Example 1, but it is still about 1 μM higher.

[0057] Example 2 MnLa 0.1 O x XRD patterns before and after the catalyst reaction are shown in the figure. Figure 6 ,from Figure 6 It can be seen that the XRD pattern still maintains the Mn2O3 phase after participating in the plasma discharge reaction with a power of 24W, indicating that the catalyst is relatively stable in activated water prepared by coupled plasma.

[0058] Example 3: A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, employing an apparatus for preparing activated water using catalyst-coordinated plasma, and the specific steps of the method are as follows:

[0059] (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with 0.5g of catalyst (Ru / Al2O3 catalyst prepared by conventional impregnation method), then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward;

[0060] (2) Fill the water storage container with deionized water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0061] (3) Adjust the airflow of the inlet pipe to 30 ml / min by mass flow meter, and energize the high voltage electrode with low temperature plasma power supply for 10 min. The working gas in the discharge area is air, and plasma is generated. At the same time, under the coupled catalytic effect of the catalyst (Ru / Al2O3 catalyst), the content of active substances in the plasma is increased. The plasma active substances activate the water in the water storage container to form plasma activated water.

[0062] In this embodiment, with a Ru loading of 2%, the increase in nitrite in plasma-activated water can reach 389 μg / L, the increase in nitrate can reach 199 μg / L, and the increase in H2O2 can reach 10.29 μM. Compared with the two catalyst couplings mentioned above, the increase in active nitrogen under the synergistic effect of Ru / Al2O3 catalyst is smaller, but the content of hydrogen peroxide is significantly increased, almost doubling.

[0063] Example 4: A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, employing an apparatus for preparing activated water using catalyst-coordinated plasma, and the specific steps of the method are as follows:

[0064] (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with 0.5g of catalyst (Co / TiO2 catalyst prepared by conventional impregnation method), then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward.

[0065] (2) Fill the water storage container with deionized water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0066] (3) Adjust the airflow of the inlet pipe to 30 ml / min by mass flow meter, and energize the high voltage electrode with low temperature plasma power supply for 10 min. The working gas in the discharge area is air, and plasma is generated. At the same time, under the coupled catalytic effect of the catalyst (Co / TiO2 catalyst), the content of active substances in the plasma is increased. The plasma active substances activate the water in the water storage container to form plasma activated water.

[0067] In this embodiment, the increase in nitrite in plasma-activated water can reach 2698 ug / L, the increase in nitrate can reach 2747 ug / L, and the increase in H2O2 is about 1 μM.

[0068] Example 5: A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, employing an apparatus for preparing activated water using catalyst-coordinated plasma, and the specific steps of the method are as follows:

[0069] (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with 0.5g of catalyst (Co3Mo3N catalyst prepared by conventional sol-gel method), then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward;

[0070] (2) Fill the water storage container with deionized water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0071] (3) Adjust the airflow of the inlet pipe to 30 ml / min by mass flow meter, and energize the high voltage electrode with low temperature plasma power supply for 10 min. The working gas in the discharge area is air, and plasma is generated. At the same time, under the coupled catalytic effect of the catalyst (Co3Mo3N catalyst), the content of active substances in the plasma is increased. The plasma active substances activate the water in the water storage container to form plasma activated water.

[0072] In this embodiment, the plasma-activated water showed an increase of 1617 ug / L in nitrite, a nitrate content of up to 5441 ug / L, and an increase of 0.7 μM in H2O2.

[0073] Example 6: A method for regulating the content of active substances in plasma-activated water using catalyst-coordinated plasma, employing an apparatus for preparing activated water using catalyst-coordinated plasma, and the specific steps of the method are as follows:

[0074] (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with 0.5g of catalyst (W2N catalyst prepared by conventional sol-gel method), then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward.

[0075] (2) Fill the water storage container with deionized water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe.

[0076] (3) Adjust the airflow of the inlet pipe to 30 ml / min by mass flow meter, and energize the high voltage electrode with low temperature plasma power supply for 10 min. The working gas in the discharge area is air, and plasma is generated. At the same time, under the coupled catalytic effect of the catalyst (W2N catalyst), the content of active substances in the plasma is increased. The plasma active substances activate the water in the water storage container to form plasma activated water.

[0077] In this embodiment, the increase in nitrite in plasma-activated water can reach 2624 ug / L, the nitrate content can reach 8890 ug / L (an increase of about 5000 ug / L compared to plasma-activated water without a coupled catalyst), and the increase in H2O2 can reach 6.29 μM.

[0078] The specific embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for regulating the content of active substances in plasma-activated water by catalyst-co-plasma, characterized in that: An apparatus for preparing activated water using catalyst-coordinated plasma, the apparatus comprising a low-temperature plasma power supply, a dielectric barrier discharge plasma jet device, a water storage container, and a gas cylinder, wherein the dielectric barrier discharge plasma jet device comprises a high-voltage electrode, a quartz tube, and a low-voltage electrode, the top of the quartz tube being fitted with a sealing plug, and the bottom of the quartz tube being a conical structure with an open bottom, the conical structure of the quartz tube being inserted into the water storage container, a grid baffle being provided above the conical structure of the quartz tube, the grid baffle being filled with catalyst, a positioning through hole being provided in the center of the grid baffle, the high-voltage electrode passing through the center of the sealing plug at the top of the quartz tube and vertically inserted downward into the positioning through hole of the grid baffle, the top of the high-voltage electrode being connected to the low-temperature plasma power supply, the low-voltage electrode being sleeved on the outer wall of the quartz tube and grounded, a gas inlet being provided at the top of the quartz tube, the gas inlet being connected to the gas cylinder through an inlet pipe, and a mass flow meter being provided on the inlet pipe; The quartz tube cavity between the bottom and top of the low-pressure electrode is the discharge region, and the catalyst is filled in the discharge region; the gas cylinder is filled with working gas; the working gas is one or more of air, nitrogen, argon, and oxygen; The specific steps of the method are as follows: (1) Place the grid baffle above the conical structure of the quartz tube, insert the high voltage electrode vertically into the quartz tube and insert the bottom end of the high voltage electrode into the positioning through hole of the grid baffle, fill the grid baffle with catalyst, then seal the top of the quartz tube with the sealing plug and let the top of the high voltage electrode pass through the sealing plug upward. (2) Fill the water storage container with water, insert the conical structure of the quartz tube into the bottom of the water in the water storage container, connect the high voltage electrode to the low temperature plasma power supply, and connect the gas inlet at the top of the quartz tube to the gas cylinder through the gas inlet pipe. (3) The airflow in the inlet pipe is adjusted by the mass flow meter, the low temperature plasma power supply is energized to the high voltage electrode, the working gas in the discharge area begins to discharge and generate plasma, and at the same time, the content of active substances in the plasma is increased under the coupled catalytic effect of the catalyst. The plasma active substances activate the water in the water storage container to form plasma activated water; the catalyst is a transition metal catalyst, a metal nitride catalyst or a metal oxide catalyst. (4) The content of active substances in plasma-activated water can be controlled by changing the catalyst type and the composition of the working gas in the gas cylinder.

2. The method for regulating the content of active substances in plasma-activated water by catalyst-co-plasma according to claim 1, characterized in that: The active component of the transition metal catalyst is one or more of Ru, Fe, Co, and Mo, and the support is a metal oxide such as Al2O3, Y2O3, SiO2, La2O3, CeO2, ZnO, TiO2, or ZrO2.

3. The method for regulating the content of active substances in plasma-activated water by catalyst-co-plasma according to claim 1, characterized in that: The metal nitride catalyst is Co3Mo3N, Mo2N, W2N or Fe2N.

4. The method for regulating the content of active substances in plasma-activated water by catalyst-coordinated plasma according to claim 1, characterized in that: The metal oxide catalyst is MnCe. 0.1 O x MnLa 0.1 O x Co2O3 or NiO; 1.1≤x≤2.1.

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