CN111511088A - Preparation method, device and application of alkaline plasma activating solution - Google Patents
Preparation method, device and application of alkaline plasma activating solution Download PDFInfo
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- CN111511088A CN111511088A CN202010356357.9A CN202010356357A CN111511088A CN 111511088 A CN111511088 A CN 111511088A CN 202010356357 A CN202010356357 A CN 202010356357A CN 111511088 A CN111511088 A CN 111511088A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
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Abstract
The application provides a preparation method, a device and application of alkaline plasma activating solution. The method prepares the plasma activating liquid rich in the RONS by adopting the alkaline working gas and/or the aqueous solution to be treated, has higher concentration of the RONS compared with the acidic and neutral conditions, can be stored for a longer time, can be prepared and stored in advance (can be adjusted to be acidic if needed in use), realizes commercialization, and overcomes the defect that the traditional preparation of the plasma activating liquid needs to be used as soon as possible. The device has simple structure and low cost for preparing the activation solution.
Description
Technical Field
The invention relates to a plasma activating solution and a preparation method thereof.
Background
At present, the atmospheric pressure cold plasma has wide application prospects in the fields of biomedicine (disinfection and sterilization, mutation breeding, battlefield biochemical decontamination and the like), flow control, combustion supporting, environmental protection and the like.
In terms of disinfection and sterilization, with the development of the world's large cities and the increasing population density, the large-scale spread and pollution of various bacteria and viruses are a major challenge in the public health field. Since various medical facilities and devices are indispensable in large scale in disease diagnosis and treatment places such as hospitals and clinics, the requirements for killing microorganisms such as sterilization, disinfection, and the like brought by instruments and workplaces are consistent and continuous. Conventional sterilization methods include ultraviolet radiation sterilization, ethylene oxide, high temperature and high pressure steam, and the like. However, ultraviolet rays and ethylene oxide may cause damage to the human body, and high-temperature and high-pressure steam may cause damage to precision instruments. The high chemical activity free radical generated by the plasma liquid phase kills microorganisms to become a novel sterilization and disinfection technology, and has the advantages of safe and simple operation, high efficiency, low cost, no drug residue and the like.
Therefore, how to improve the survival life of the active radical particles in the plasma activation solution, improve the storage time, and develop the efficient plasma activation solution is one of the difficulties and hot spots of the current research.
Disclosure of Invention
The purpose of the application is to improve the survival life of active free radical particles in a plasma activating solution and maintain high chemical activity of the active free radical particles based on an atmospheric pressure cold plasma technology.
The inventive concept of the present application is as follows:
at present, the traditional research mainly focuses on the action effect and the preparation method of the acid/neutral plasma activating solution, because the chemical activity of the radical particles is generally considered to be higher in the acidic environment. The acid/neutral activating solution is characterized by high concentration of active particles, complex chemical components and simple and quick preparation. However, applicants have recognized that the concentration of reactive oxygen nitrogen particles (RONS) decays very rapidly when the acid/neutral activation solution is allowed to stand, limiting flexibility and timeliness for applications in biomedical applications and the like; by preparing an alkaline plasma activating solution of highly chemically active radical particles and performing experimental analysis, the applicant has clarified that: the alkaline activating solution has higher concentration of active particles and longer storage time, so that it can be prepared and stored in advance (or adjusted to be acidic if necessary) and can act on living body for a longer time.
The technical scheme of the application is as follows:
in a first aspect, an alkaline plasma activating solution (particularly commercially available with a shelf life of 2 hours or more) has a pH greater than 7 and is enriched with liquid phase active oxygen nitrogen particles (RONS).
In a second aspect, the alkaline plasma activating solution is used for storage.
In a third aspect, a method for preparing the alkaline plasma activating solution adopts a cold plasma generating module with a surface discharge structure to be assembled with an activating solution container containing a solution to be treated, and enables the cold plasma generating interface to have a gas gap; making the aqueous solution to be treated and/or the working gas alkaline; under the excitation of a high-voltage power supply, the cold plasma generating module generates cold plasma to treat the solution to be treated; the pH value of the solution is more than 7 and meets the requirement by adjusting the discharge time length and the discharge gap.
Further, the pH value of the solution to be treated is more than 7, and the gas is air or oxygen; or the pH value of the solution to be treated is 7, and the gas is NH3A mixed gas with an inert gas;
further preferably:
the solution to be treated is NaOH solution, and the concentration is 1 mol/L.
Or the solution to be treated contains Na2HPO4And KH2PO4With hydrochloric acid and sodium hydroxide to a pH greater than 7.
Or, the solution to be treated is deionized water, and the gas is NH3Mixed gas with Ar, wherein Ar accounts for 98 percent, NH3Accounting for 2 percent, and leading the corresponding ammonia water concentration to reach 0.75 percent.
In a fourth aspect, an apparatus for preparing the above alkaline plasma activating solution comprises: the device comprises a high-voltage power supply, a cold plasma generation module adopting a creeping discharge structure and an activation liquid container containing a solution to be treated;
the cold plasma generation module comprises an insulating dielectric plate for dielectric barrier discharge, a high-voltage electrode and a ground electrode with a grid structure, wherein the ground electrode is used as a cold plasma generation interface for creeping discharge, and a gas gap is formed between the ground electrode and the activation liquid container; the aqueous solution to be treated and/or the working gas is alkaline;
the positive output end and the negative output end of the high-voltage power supply are respectively connected with a high-voltage electrode and a ground electrode of the cold plasma generation module, and the cold plasma is generated by exciting the cold plasma generation module to process the solution to be processed; the discharge time and the discharge gap meet the requirement that the pH value of the solution is more than 7.
Further preferably: the distance of the gas gap is 12 mm.
Further preferably: the cold plasma generating interface is in sealed butt joint with or keeps a gap with an opening at the upper end of the activating liquid container, and the activating liquid container (when in sealed butt joint, the side face of the upper part of the activating liquid container) is provided with a gas inlet and a liquid outlet.
Further preferably: the cold plasma generation module is formed by connecting one or more creeping discharge assemblies in parallel.
Further preferably: the high-voltage power supply adopts a high-voltage sine power supply or a high-voltage pulse power supply.
The invention has the following advantages:
(1) the transfer of plasma-generated highly reactive chemical species into the liquid may undergo some chemical reaction, thereby generating ron, and may cause prolonged biochemical and biological effects over a longer time scale;
(2) the RONS in the alkaline plasma activating solution has higher concentration under alkaline conditions compared with acidic and neutral conditions, and can be stored for a longer time, so that the RONS can be prepared and stored in advance (can be adjusted to be acidic if needed) to realize commercialization, and the defect that the traditional plasma activating solution preparation needs to be used as soon as possible is overcome.
(3) The device has simple structure and low cost for preparing the activation solution.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an apparatus for preparing an alkaline plasma activating solution according to the present invention; in the figure, 100-a cold plasma generation module adopting a creeping discharge structure; 200-discharge gas (gas gap); 300-a solution to be treated; 1-high voltage electrode, 2-dielectric plate, 3-ground electrode.
Fig. 2 shows the concentration of ron in the plasma activation solution under acidic (pH 3) and basic (pH 10) conditions; in the figure, the dark (left) column corresponds to pH 3 and the light (right) column corresponds to pH 10.
Fig. 3 shows the change of the liquid phase active particle concentration with time under acidic (pH 3) and basic (pH 10) conditions; in the figure, the upper two curves correspond to pH 10 and the lower two curves correspond to pH 3.
Detailed Description
The present application will be described in further detail below by way of examples with reference to the accompanying drawings. It should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, nor are the inventors' specific development procedures limited thereto.
As shown in fig. 1, a cold plasma generation module adopting a creeping discharge structure is assembled with an activating liquid container containing a solution to be treated, and a cold plasma generation interface is formed and a gas gap is formed; the high voltage electrode and the ground electrode are respectively connected to two sides of the insulating medium plate to form a cold plasma generation module for dielectric barrier discharge, and ozone, hydrogen peroxide, nitric acid and nitrous acid particles can be generated by taking air as discharge gas. In this embodiment, the aqueous solution to be treated and/or the working gas are alkaline. The solution to be treated is placed in a container, the container is placed under the cold plasma generation module, and the solution to be treated is placed at a specific distance from the ground electrode. The distance between the solution to be treated and the atmospheric pressure cold plasma generation module can be properly adjusted, and is preferably 12 mm.
The material of the dielectric barrier discharge insulating dielectric plate can be selected according to the requirement.
The power supply of the atmospheric pressure cold plasma generation module can select a high-voltage sine power supply or a high-voltage pulse power supply.
The atmospheric pressure cold plasma generation module can be formed by connecting one or more creeping discharge assemblies in parallel.
Starting a high-voltage power supply, introducing discharge gas, and under the excitation of the high-voltage power supply, generating plasma on the surface of one side of a ground electrode of the plasma generation module to indirectly treat the solution to be treated. The discharge duration and the discharge gap are adjusted so that the pH of the solution meets the practical requirements and is still greater than 7.
Optionally, when the discharge gas is air, the treatment solution may be a sodium hydroxide solution or a phosphoric acid buffer solution; the discharge gas being Ar/NH3When mixed, the treatment solution may be deionized water. For example:
1. the alkaline plasma activating solution with variable pH can be obtained by treating an alkaline NaOH solution, wherein the pH can be adjusted according to actual needs, and the alkaline plasma activating solution with different pH (preferably the concentration is 1 mol/L) can be obtained by treating different time.
2. Treatment with Na2HPO4And KH2PO4Phosphate Buffered Saline (PBS) to a pH of greater than 7 prior to treatment to obtain a constant pH alkaline plasma activator solution, e.g., 6m L0.1.1 mol/L Na2HPO4And 4m L0.1 mol/L KH2PO4PBS was formulated at pH 7, and pH was adjusted by hydrochloric acid and sodium hydroxide. Wherein Na2HPO4And KH2PO4And the function of caching is realized.
3. With Ar/NH3The mixed gas of (1) is substituted for air, wherein Ar accounts for 98%, NH3Accounting for 2 percent, treating the deionized water to obtain alkalescent plasma activating solution (the concentration of the ammonia solution is preferably 0.75 percent).
As can be seen from fig. 2, the concentration of ron in the alkaline plasma-activated liquid is higher than that in the acidic plasma-activated liquid as a whole.
As can be seen from fig. 3, the active particle concentration of the acidic plasma activation solution after being left standing for 2 hours is already close to 0, while the active particle concentration of the alkaline plasma activation solution is still stably maintained at a higher level (the life of the active particles of the plasma activation solution is prolonged).
Claims (10)
1. An alkaline plasma activating solution, which is characterized in that: the pH value is more than 7, and the oxygen nitrogen oxide particle (RONS) is rich in liquid phase.
2. Use of the alkaline plasma-activating liquid according to claim 1 for storage and use.
3. A method for preparing the alkaline plasma activating solution according to claim 1, characterized in that:
a cold plasma generating module with a surface discharge structure is assembled with an activating liquid container containing a solution to be treated, and an interface generated by cold plasma and a gas gap are formed;
making the aqueous solution to be treated and/or the working gas alkaline;
under the excitation of a high-voltage power supply, the cold plasma generating module generates cold plasma to treat the solution to be treated; the pH value of the solution is more than 7 and meets the requirement by adjusting the discharge time length and the discharge gap.
4. The method of claim 3, wherein: the pH value of the solution to be treated is more than 7, and the gas is air or oxygen; or the pH value of the solution to be treated is 7, and the gas is NH3Mixed gas with inert gas.
5. The method of claim 3, wherein:
the solution to be treated is NaOH solution, and the concentration is 1 mol/L.
Or the solution to be treated contains Na2HPO4And KH2PO4With hydrochloric acid and sodium hydroxide to a pH greater than 7.
Or, the solution to be treated is deionized water, and the gas is NH3Mixed gas with Ar, wherein Ar accounts for 98 percent, NH3Accounting for 2 percent, and leading the corresponding ammonia water concentration to reach 0.75 percent.
6. An apparatus for preparing the alkaline plasma activating liquid according to claim 1, comprising: the device comprises a high-voltage power supply, a cold plasma generation module adopting a creeping discharge structure and an activation liquid container containing a solution to be treated;
the cold plasma generation module comprises an insulating dielectric plate for dielectric barrier discharge, a high-voltage electrode and a ground electrode with a grid structure, wherein the ground electrode is used as a cold plasma generation interface for creeping discharge, and a gas gap is formed between the ground electrode and the activation liquid container; the aqueous solution to be treated and/or the working gas is alkaline;
the positive output end and the negative output end of the high-voltage power supply are respectively connected with a high-voltage electrode and a ground electrode of the cold plasma generation module, and the cold plasma is generated by exciting the cold plasma generation module to process the solution to be processed; the discharge time and the discharge gap meet the requirement that the pH value of the solution is more than 7.
7. The apparatus of claim 6, wherein: the distance of the gas gap is 12 mm.
8. The apparatus of claim 6, wherein: the cold plasma generating interface is in sealed butt joint with or keeps a gap with an opening at the upper end of the activating liquid container, and the activating liquid container is provided with a gas inlet and a liquid outlet.
9. The apparatus of claim 6, wherein: the cold plasma generation module is formed by connecting one or more creeping discharge assemblies in parallel.
10. The apparatus of claim 6, wherein: the high-voltage power supply adopts a high-voltage sine power supply or a high-voltage pulse power supply.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112125374A (en) * | 2020-09-14 | 2020-12-25 | 西安交通大学 | Method and device for preserving plasma activated water and method for preparing finished product |
| CN112689372A (en) * | 2020-12-10 | 2021-04-20 | 西安交通大学 | Method for restoring/enhancing chemical activity of plasma activation solution |
| CN114890499A (en) * | 2022-06-07 | 2022-08-12 | 珠海格力电器股份有限公司 | Plasma activated water preparation device |
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