Coaxial DBD plasma generating device

Abstract

The invention discloses a coaxial DBD plasma generating device which comprises a coaxial DBD discharge reactor with a medium tube, an activated carbon loaded AgMnOx catalyst is arranged in the medium tube, and the molar ratio of Ag to Mn in the activated carbon loaded AgMnOx catalyst is (5-10): 1. The coaxial DBD discharge reactor is combined with a specific type of AgMnOx catalyst, so that the ozone concentration is reduced while the sterilization effect of the plasma generator is ensured, namely, the device disclosed by the invention realizes the purpose of reducing the ozone release of the plasma while efficiently sterilizing the microorganisms.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to a coaxial DBD plasma generating device. Background Art

[0002] Plasma is a fourth state of matter, in addition to gas, liquid, and solid. It is composed of numerous electrons, ions, neutral particles, and free radicals, and contains a variety of high-energy particles. The reactive oxygen free radicals contained in plasma can disinfect microorganisms and can be used for sterilization. Ozone plays a major role in this sterilization.

[0003] Research has proven that applying high voltage between electrodes can create a plasma discharge, which ionizes the air and produces high-concentration ozone (3O2 → 2O3). If the voltage is too low, plasma discharge cannot occur, or the ozone generated after the plasma discharge is too low, resulting in too little ozone. Low ozone levels can lead to poor sterilization effectiveness. Achieving the desired sterilization effect often requires a high input voltage, which consumes a lot of energy and makes the amount of ozone produced difficult to control. The resulting ozone concentration is generally high, often far exceeding safe levels for human exposure, significantly limiting its further application.

[0004] At present, in order to solve the ozone problem, the discharge voltage is generally controlled to reduce ozone production, but the corresponding sterilization performance will be weakened; or an ozone reduction network is added to the back end of the plasma generator to decompose the ozone, which will increase the cost. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is how to reduce the ozone concentration while ensuring the sterilization effect of the plasma generator, thereby providing a coaxial DBD plasma generator with a low ozone content.

[0006] A coaxial DBD plasma generating device comprises: a coaxial DBD discharge reactor having a dielectric tube;

[0007] An activated carbon-supported AgMnOx catalyst is arranged in the medium tube, and the molar ratio of Ag to Mn in the activated carbon-supported AgMnOx catalyst is (5-10):1.

[0008] The porosity of the activated carbon in the activated carbon-supported AgMnOx catalyst is 60% to 70%, and / or the pore size is 2 to 50 nm;

[0009] And / or, the loading amount of the AgMnOx catalyst in the activated carbon-supported AgMnOx catalyst is 5 wt.% to 15 wt.%.

[0010] The particle size of the activated carbon-supported AgMnOx catalyst is 1 to 3 mm.

[0011] The preparation process of the activated carbon-supported AgMnOx catalyst is as follows:

[0012] dissolving a Mn precursor salt and an Ag precursor salt in deionized water to obtain a mixed solution;

[0013] subjecting the mixed solution to a hydrothermal reaction to obtain a hydrothermal reaction solution;

[0014] Adding activated carbon to the hydrothermal reaction solution for static adsorption;

[0015] After standing and adsorption, wash and dry;

[0016] After drying, the catalyst was calcined to obtain an activated carbon-supported AgMnOx catalyst.

[0017] The reaction conditions of the hydrothermal reaction are: 100-150° C. for 10-15 hours.

[0018] The drying temperature is 80°C to 120°C.

[0019] The calcination conditions are: calcination at 200° C. to 400° C. for 2 to 4 hours, and a heating rate of 2 to 5° C. / min.

[0020] The Mn precursor salt is a water-soluble manganese salt, preferably at least one of potassium permanganate, manganese nitrate, and manganese acetate.

[0021] The Ag precursor salt is a water-soluble silver salt, preferably at least one of silver nitrate and silver chloride.

[0022] The coaxial DBD discharge reactor comprises:

[0023] inner electrode;

[0024] The outer electrode is an annular structure and is coaxially arranged with the inner electrode;

[0025] a dielectric tube, located between the inner electrode and the outer electrode, the dielectric tube having a gas outlet and a gas inlet;

[0026] a high voltage source for applying high voltage to the inner electrode and the outer electrode;

[0027] The outer electrode is located between the gas outlet and the gas inlet, and the area between the inner electrode and the outer electrode is the plasma area; the activated carbon-supported AgMnOx catalyst is arranged in the dielectric tube located in the plasma area.

[0028] The above-mentioned outer electrode is a metal mesh electrode, and the inner electrode is a copper cylindrical electrode. The outer electrode and the inner electrode are coaxially arranged, and the dielectric tube is arranged between the coaxial outer electrode and the inner electrode, and the axis of the dielectric tube is parallel to or coincides with the inner electrode. The dielectric tube is provided with a gas outlet and a gas inlet, and the outer electrode is arranged between the gas outlet and the gas inlet of the dielectric tube. The dielectric tube located in the plasma area is filled with an activated carbon-loaded AgMnOx catalyst.

[0029] The dielectric tube may be a concentric sleeve structure composed of two quartz dielectric cylinders, with a gas outlet and a gas inlet provided on the outer cylinder, the inner cylinder being sleeved on the inner electrode, and the outer electrode being wrapped between the gas outlet and the gas inlet of the outer cylinder.

[0030] The above-mentioned dielectric tube can be composed of a quartz dielectric cylinder fixed on an inner electrode through high-temperature resistant silicone. The cylindrical inner electrode passes through the cylinder, and the gap between the inner electrode and the cylinder serves as the catalyst filling space of the dielectric tube. A gas outlet and a gas inlet are set at the position of the high-temperature silicone or on the cylinder. The outer electrode is wrapped on the outer wall of the cylinder between the gas outlet and the gas inlet, so that the outer electrode and the inner electrode are coaxially arranged. In order to avoid direct contact between the catalyst and the inner electrode, which may easily lead to unstable discharge phenomena such as arcing and sparking, the surface of the inner electrode is also provided with a layer of insulating coating to achieve isolation between the catalyst and the electrode, so that they do not interfere with each other and can achieve long-term stable discharge.

[0031] The technical solution of the present invention has the following advantages:

[0032] 1. The present invention provides a coaxial DBD plasma generator that utilizes a coaxial DBD discharge reactor combined with a specific type of AgMnOx catalyst to reduce ozone concentration while ensuring the sterilization effect of the plasma generator. That is, the device of the present invention achieves the goal of highly efficient microbial disinfection while reducing ozone release from the plasma. Specifically, the coaxial DBD discharge reactor can completely fill the activated carbon-loaded AgMnOx catalyst into the plasma region within the dielectric tube of the coaxial DBD discharge reactor itself, achieving micro-discharge within the pores of the porous structure. The catalytic active sites within the pores can convert ozone into more oxidizing O2 in real time. - 、O2 2 , reducing ozone release while ensuring a sterilizing effect; and the AgMnOx catalyst itself also has the effect of degrading organic pollutants such as VOCs. Therefore, the device of the present invention can be used for both microbial disinfection and gaseous pollution removal, while also achieving the goal of low ozone levels.

[0033] 2. The AgMnOx catalyst supported on activated carbon used in the device provided by the present invention is modified by doping the activated carbon with Ag and Mn elements in a specific ratio, thereby generating more lattice defects and improving the catalytic performance. Using activated carbon as a carrier, the large amount of ozone released by the plasma can also be converted into O2 in real time within the activated carbon pores by taking advantage of the loose and porous properties of the activated carbon surface. - 、O2 2 , while further improving the strong oxidizing properties of plasma. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 It is a structural schematic diagram of the coaxial DBD plasma generating device in the present invention.

[0036] The description of the accompanying drawings is as follows:

[0037] 1-Inner electrode, 2-Insulation coating, 3-Dielectric tube, 4-Fixed structure, 5-Outer electrode, 6-High voltage power supply. DETAILED DESCRIPTION

[0038] The following examples are provided for a better understanding of the present invention and are not intended to limit the best mode of implementation. They do not limit the content and scope of protection of the present invention. Any product identical or similar to the present invention obtained by anyone under the guidance of the present invention or by combining the features of the present invention with other prior arts shall fall within the scope of protection of the present invention.

[0039] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in this field can be used. If the manufacturer of the reagents or instruments is not specified, they are all commercially available conventional reagents.

[0040] Example 1

[0041] A coaxial DBD plasma generating device, such as Figure 1 As shown, it includes a coaxial DBD discharge reactor and an activated carbon-supported AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0042] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0043] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0044] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0045] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0046] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0047] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0048] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0049] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0050] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0051] Example 2

[0052] A coaxial DBD plasma generating device, such as Figure 1 As shown, it includes a coaxial DBD discharge reactor and an activated carbon-supported AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0053] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0054] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0055] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 7:1, and dissolve them in deionized water to obtain a mixed solution;

[0056] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0057] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0058] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0059] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0060] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0061] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0062] Example 3

[0063] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0064] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0065] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0066] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of 5:1 and dissolve them in deionized water to obtain a mixed solution;

[0067] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0068] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0069] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0070] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0071] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0072] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0073] Example 4

[0074] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0075] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0076] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0077] 1) Weighing a Mn precursor salt, manganese nitrate, and an Ag precursor salt, silver chloride, with a molar ratio of Mn to Ag of 10:1, and dissolving them in deionized water to obtain a mixed solution;

[0078] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0079] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0080] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0081] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0082] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0083] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0084] Example 5

[0085] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0086] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0087] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0088] 1) Weighing a Mn precursor salt, manganese acetate, and an Ag precursor salt, silver nitrate, with a molar ratio of Mn to Ag of 10:1, and dissolving them in deionized water to obtain a mixed solution;

[0089] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0090] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0091] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0092] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0093] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0094] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0095] Example 6

[0096] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0097] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0098] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0099] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0100] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 100° C. for 15 h to obtain a hydrothermal reaction solution;

[0101] 3) Add activated carbon (porosity 60%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0102] 3) After standing overnight, wash and filter, and then dry at 120°C overnight;

[0103] 4) Calcination in a muffle furnace at 400° C. for 2 h with a heating rate of 2° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0104] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0105] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0106] Example 7

[0107] A coaxial DBD plasma generating device, such as Figure 1 As shown, it includes a coaxial DBD discharge reactor and an activated carbon-supported AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0108] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0109] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0110] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0111] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 150° C. for 10 h to obtain a hydrothermal reaction solution;

[0112] 3) Add activated carbon (porosity 70%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0113] 3) After standing overnight, wash and filter, and then dry at 80°C overnight;

[0114] 4) Calcination in a muffle furnace at 200° C. for 4 h with a heating rate of 5° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 10 wt.%.

[0115] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0116] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0117] Example 8

[0118] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0119] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0120] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0121] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0122] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0123] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0124] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0125] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 5 wt.%.

[0126] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0127] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0128] Example 9

[0129] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0130] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0131] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0132] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0133] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0134] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0135] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0136] 4) Calcination in a muffle furnace at 300° C. for 3 h with a heating rate of 3° C. / min to obtain an activated carbon-supported AgMnOx catalyst, wherein the loading amount of the AgMnOx catalyst in the activated carbon is 15 wt.%.

[0137] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0138] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0139] Comparative Example 1

[0140] A coaxial DBD plasma generating device differs from Example 1 only in that it includes a coaxial DBD discharge reactor, in which no activated carbon-supported AgMnOx catalyst is placed, and other structural arrangements are the same as those of Example 1.

[0141] The application of the above-mentioned coaxial DBD plasma generator in microbial disinfection is as follows:

[0142] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0143] Comparative Example 2

[0144] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded CuMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0145] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylindrical structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, sealing and fixing both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 constitutes the catalyst filling space, which is used to fill the activated carbon-supported CuMnOx catalyst of the present invention.

[0146] The specific preparation process of the above-mentioned activated carbon-supported CuMnOx catalyst is as follows:

[0147] 1) Weigh potassium permanganate (a Mn precursor salt) and copper nitrate (a Cu precursor salt) at a molar ratio of Mn to Cu of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0148] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0149] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0150] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0151] 4) Calcination in a muffle furnace at 300°C for 3 h with a heating rate of 3°C / min to obtain an activated carbon-supported CuMnOx catalyst.

[0152] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0153] A bacterial solution having a viable bacterial count of V1 was applied to a glass sheet. The glass sheet and the coaxial DBD plasma generator were placed in a 50L confined space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the confined space was tested, and the number of viable microorganisms V2 on the glass sheet was detected to obtain a microbial kill rate (% = (v1-v2) / v1*100%). The microorganism used in this comparative example was Staphylococcus aureus.

[0154] Comparative Example 3

[0155] A coaxial DBD plasma generating device, such as Figure 1 As shown, it includes a coaxial DBD discharge reactor and a CeO2-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0156] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, sealing and fixing both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the CeO2-loaded AgMnOx catalyst of the present invention.

[0157] The specific preparation process of the CeO2-loaded AgMnOx catalyst is as follows:

[0158] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 10:1, and dissolve them in deionized water to obtain a mixed solution;

[0159] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0160] 3) Add CeO2 (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0161] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0162] 4) Calcinate in a muffle furnace at 300°C for 3 h with a heating rate of 3°C / min to obtain a CeO2-loaded AgMnOx catalyst.

[0163] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0164] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0165] Comparative Example 4

[0166] A coaxial DBD plasma generating device comprises a coaxial DBD discharge reactor and an activated carbon-loaded AgMnOx catalyst arranged in the coaxial DBD discharge reactor.

[0167] The coaxial DBD discharge reactor comprises an inner electrode 1 with a copper cylinder structure; an insulating coating 2 attached to the surface of the inner electrode 1; a dielectric tube 3 made of quartz glass, sleeved on the inner electrode 1; a fixing structure 4, such as high-temperature-resistant silicone, that seals and secures both ends of the dielectric tube 3 to the inner electrode 1; a gas outlet and a gas inlet provided on the dielectric tube 3; a metal mesh outer electrode 5 sleeved on the dielectric tube 3 and coaxially arranged with the inner electrode 1; and a high-voltage power supply 6 connected to the outer electrode 5. The other end of the high-voltage power supply 6 is grounded, as is the outer electrode 5; and the outer electrode 5 is located between the gas outlet and the gas inlet. The space formed by the insulating coating 2, the fixing structure 4, and the dielectric tube 3 is the catalyst filling space, which is used to fill the activated carbon-supported AgMnOx catalyst of the present invention.

[0168] The specific preparation process of the above-mentioned activated carbon-supported AgMnOx catalyst is as follows:

[0169] 1) Weigh potassium permanganate (a Mn precursor salt) and silver nitrate (an Ag precursor salt) at a molar ratio of Mn to Ag of 2:1, and dissolve them in deionized water to obtain a mixed solution;

[0170] 2) The mixed solution was transferred to a hydrothermal reactor and reacted at 120° C. for 12 h to obtain a hydrothermal reaction solution;

[0171] 3) Add activated carbon (porosity 65%, pore size 2-50 nm, particle size 1-3 mm) to the hydrothermal reaction solution, stir thoroughly, and let it stand overnight;

[0172] 3) After standing overnight, wash and filter, and then dry at 100°C overnight;

[0173] 4) Calcination in a muffle furnace at 300°C for 3 h with a heating rate of 3°C / min to obtain an activated carbon-supported AgMnOx catalyst.

[0174] The application of coaxial DBD plasma generator in microbial disinfection, the specific application process is as follows:

[0175] A bacterial solution having a viable bacterial count of V1 was applied to a glass slide. The glass slide and the coaxial DBD plasma generator were placed in a 50L enclosed space. An AC voltage of Vpp = 11 to 20 kV was applied to the device, and the discharge was performed for 10 minutes. The amount of ozone released in the enclosed space was tested, and the number of viable microorganisms V2 on the glass slide was detected to obtain a microbial kill rate (%) = (v1-v2) / v1*100%. The microorganism used in this embodiment is Staphylococcus aureus.

[0176] The test results of the above examples and comparative examples are shown in Table 1 below.

[0177] Table 1

[0178]

[0179]

[0180] The device produced by the present invention incorporates a high-temperature-resistant AgMnOx catalyst capable of catalytically converting ozone onto activated carbon. The modified activated carbon is then placed within a plasma zone. The device is simple and efficient to use, achieving low ozone release and excellent sterilization effectiveness by applying high pressure.

[0181] This invention creates a novel, highly efficient photocatalyst, AgMnOx, by doping and coupling different active components, Mn and Ag, in specific molar ratios. This catalyst, when combined with a coaxial DBD discharge reactor, exhibits excellent ozone conversion performance and high-temperature stability. It converts plasma-released ozone into active species such as hydroxyl radicals and superoxide radicals in real time, achieving highly effective microbial disinfection through the combined effects of the active species and the plasma's electric field.

[0182] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A coaxial DBD plasma generating device, comprising: A coaxial DBD discharge reactor with a dielectric tube is characterized in that: An activated carbon-supported AgMnOx catalyst is arranged in the medium tube, and the molar ratio of Ag to Mn in the activated carbon-supported AgMnOx catalyst is (5-10):

1.

2. The device according to claim 1, characterized in that The porosity of the activated carbon in the activated carbon-supported AgMnOx catalyst is 60% to 70%, and / or the pore size is 2 to 50 nm; And / or, the loading amount of the AgMnOx catalyst in the activated carbon-supported AgMnOx catalyst is 5 wt.% to 15 wt.%.

3. The device according to claim 1, characterized in that The particle size of the activated carbon-supported AgMnOx catalyst is 1 to 3 mm.

4. The device according to any one of claims 1 to 3, characterized in that The preparation process of the activated carbon-supported AgMnOx catalyst is as follows: dissolving a Mn precursor salt and an Ag precursor salt in deionized water to obtain a mixed solution; subjecting the mixed solution to a hydrothermal reaction to obtain a hydrothermal reaction solution; Adding activated carbon to the hydrothermal reaction solution for static adsorption; After standing and adsorption, wash and dry; After drying, the catalyst was calcined to obtain an activated carbon-supported AgMnOx catalyst.

5. The device according to claim 4, characterized in that The reaction conditions of the hydrothermal reaction are: 100-150° C. for 10-15 hours.

6. The device according to claim 4, characterized in that The drying temperature is 80°C to 120°C.

7. The device according to claim 4, characterized in that The calcination conditions are: calcination at 200° C. to 400° C. for 2 to 4 hours, and a heating rate of 2 to 5° C. / min.

8. The device according to claim 4, characterized in that The Mn precursor salt is a water-soluble manganese salt, preferably at least one of potassium permanganate, manganese nitrate, and manganese acetate.

9. The device according to claim 4, characterized in that The Ag precursor salt is a water-soluble silver salt, preferably at least one of silver nitrate and silver chloride.

10. The device according to any one of claims 1 to 9, characterized in that The coaxial DBD discharge reactor comprises: inner electrode; The outer electrode is an annular structure and is coaxially arranged with the inner electrode; a dielectric tube, located between the inner electrode and the outer electrode, the dielectric tube having a gas outlet and a gas inlet; a high voltage source for applying high voltage to the inner electrode and the outer electrode; The outer electrode is located between the gas outlet and the gas inlet, and the area between the inner electrode and the outer electrode is the plasma area; the activated carbon-supported AgMnOx catalyst is arranged in the dielectric tube located in the plasma area.

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