Ultrafast synthesized cobalt-modified molybdenum disulfide material and method for applying cobalt-modified molybdenum disulfide material to piezoelectric catalytic sterilization

Abstract

The invention provides an ultra-fast synthesized cobalt-doped molybdenum disulfide material and an application method thereof in piezoelectric catalytic sterilization. According to the method, through solid-phase reaction and magnetic induction heating, the problems of complexity and high cost of a traditional method are solved. The method is simple to operate and short in preparation time, and the efficient cobalt-doped molybdenum disulfide-based piezoelectric catalytic material can be synthesized in a short time. Meanwhile, the material can be triggered by weak energy such as stirring, has excellent piezoelectric catalytic sterilization performance and stability, and can be widely applied to the fields of water, air and life sterilization and the like.

Description

[Technical field]

[0001] The present invention relates to a method for rapidly synthesizing a cobalt-doped molybdenum disulfide material and its application in piezoelectric catalytic sterilization, in particular to a method for rapidly preparing a cobalt-doped molybdenum disulfide piezoelectric catalytic material by magnetic induction heating technology and its application in the sterilization field, belonging to the field of environmental engineering technology. [Background technology]

[0002] With the continuous development of society and technology, the problems of infection and disease caused by bacteria are becoming more and more serious, especially in the fields of medical health, food safety and public environment. The demand for efficient sterilization technology is very urgent. Although traditional sterilization methods such as chemical disinfection and thermal sterilization are effective, they have some limitations. For example, chemical disinfectants may remain and cause harm to the environment and human body, and thermal sterilization may damage some temperature-sensitive items. Therefore, it is urgent to develop new, efficient and environmentally friendly sterilization technologies.

[0003] In recent years, piezoelectric catalytic technology has attracted widespread attention due to its high efficiency and environmental protection in the field of sterilization. Molybdenum disulfide (MoS2), as a transition metal sulfide, shows good prospects in sterilization applications due to its unique layered structure and excellent catalytic performance. However, pure MoS2 materials have some shortcomings in practical applications, such as poor conductivity and insufficient active sites, which limit the further improvement of their catalytic performance. In order to overcome these defects, researchers have proposed to modify MoS2 by doping metal elements to improve its conductivity and catalytic activity. Cobalt (Co), as a transition metal, has become an ideal doping element due to its variable oxidation state and unique electronic structure. Cobalt-doped MoS2 materials show better catalytic performance than pure MoS2. However, the existing synthesis methods of Co-doped MoS2 materials usually have problems such as cumbersome steps, long time consumption and high cost, which makes it difficult to achieve large-scale preparation and application.

[0004] The present invention proposes a method for ultra-fast synthesis of cobalt-doped molybdenum disulfide materials, which significantly shortens the material preparation time and improves the catalytic performance of the material by combining ultrasonic treatment, rotary evaporation and magnetic induction heating technology. The method is simple to operate, efficient and suitable for large-scale production.

[0005] In addition, cobalt-doped molybdenum disulfide materials have shown significant effects in piezoelectric catalytic sterilization. Active species generated by piezoelectric catalytic reactions, such as hydroxyl radicals and superoxide anions, can effectively destroy the cell walls and cell membranes of bacteria, thereby achieving efficient sterilization. This material has broad application prospects in the field of sterilization and is expected to solve many problems in existing technologies and provide new solutions for medical care, food safety and public environmental protection. [Summary of the invention]

[0006] [Technical issues to be solved]

[0007] The purpose of the present invention is to provide a method for ultra-fast synthesis of cobalt-doped molybdenum disulfide materials and their application in piezoelectric catalytic sterilization. The method overcomes the complexity and high cost of traditional methods through solid-phase reaction and magnetic induction heating. The method is simple to operate and has a short preparation time, and can synthesize efficient cobalt-doped molybdenum disulfide-based piezoelectric catalytic materials in a short time. At the same time, the material can be triggered by weak energy such as stirring, has excellent piezoelectric catalytic sterilization performance and stability, and can be widely used in water, air and daily life sterilization and other fields.

[0008] [Technical solution]

[0009] A method for ultra-fast synthesis of cobalt-modified molybdenum disulfide material and its piezoelectric catalytic sterilization application, characterized in that an ultra-fast synthesis of cobalt-modified molybdenum disulfide material comprises the following steps:

[0010] (1) 100-500 mg of sodium molybdate, 100-500 mg of thiourea and 5-100 mg of cobalt chloride are dissolved in 5 mL to 50 mL of ethanol and treated with ultrasound to obtain a transparent solution.

[0011] (2) Add 50 mg to 200 mg of carbon black to the above transparent solution and mix well.

[0012] (3) The mixture was dried by rotary evaporation.

[0013] (4) The dried mixture is further dried in a vacuum oven at 50° C. to 100° C. for 4 to 12 hours.

[0014] (5) The dried material is loaded onto an iron sheet covered with a graphite paper with a thickness of 0.01 mm to 0.05 mm, and the size of the iron sheet is 2 cm to 5 cm×2 cm to 5 cm×0.1 mm to 0.5 mm.

[0015] (6) Place the above assembly in a refractory brick inside a quartz tube and purge with high-purity inert gas for 5 to 30 minutes.

[0016] (7) The quartz tube is placed in a multi-turn induction coil with a diameter of 3 cm to 7 cm and subjected to magnetic induction heating for 5 seconds to 30 seconds under a controlled current (X=50 to 800 A).

[0017] (8) After magnetic induction heating, the sample is allowed to cool naturally to room temperature, and finally a cobalt-modified molybdenum disulfide-based piezoelectric catalytic material is obtained.

[0018] [Beneficial Effects]

[0019] Cobalt-doped molybdenum disulfide materials have shown remarkable effects in piezoelectric catalytic sterilization. Active species generated by piezoelectric catalytic reactions, such as hydroxyl radicals and superoxide anions, can effectively destroy the cell walls and cell membranes of bacteria, thereby achieving efficient sterilization. This material has broad application prospects in the field of sterilization and is expected to solve many problems in existing technologies and provide new solutions for medical health, food safety and public environmental protection.

Brief Description of the Drawings

[0020] Figure 1 : A transmission electron microscope (TEM) image of the cobalt / MoS2 piezoelectric catalytic material prepared after Example 1 is shown, showing its microstructure.

[0021] Figure 2 :The effect diagram of the cobalt / MoS2 piezoelectric catalytic material prepared after Example 1 in sterilization is shown, illustrating its application potential in sterilization in multiple scenarios. [Specific implementation method]

[0022] Embodiment 1:

[0023] (1) Take 1 g of sodium molybdate powder, 2 g of thiourea and 0.2 g of cobalt nitrate (Co(NO3)2·6H2O) and dissolve them in a mixed solution of 50 ml of ethanol and 50 ml of deionized water.

[0024] (2) The mixed solution was placed in an ultrasonic processor and the ultrasonic treatment time was set to 30 minutes and the frequency was set to 40 kHz to ensure that the cobalt ions were evenly dispersed in the molybdenum disulfide.

[0025] (3) The solution after ultrasonic treatment was transferred to a rotary evaporator, set the temperature to 60°C, and evaporate under reduced pressure until a dry powder was obtained.

[0026] (4) The dried powder was placed in a magnetic induction heating furnace, and the heating current was set to 500 A and the heating time was set to 10 seconds to ensure that the cobalt element was uniformly doped into the molybdenum disulfide matrix.

[0027] (5) After the heating is completed, the mixture is naturally cooled to room temperature, and the cobalt-modified molybdenum disulfide material is collected and its morphology and structure are observed by transmission electron microscopy. Figure 1 .

[0028] (6) The prepared cobalt-modified molybdenum disulfide material is dispersed in deionized water to prepare a suspension with a concentration of 1 g / L.

[0029] (7) Take 100 ml of E. coli suspension (concentration is about 10 6 CFU / mL) and added to the beaker containing the suspension.

[0030] (8) Place the mixed solution beaker containing bacteria and materials on a magnetic stirrer and stir at 800 rpm for 30, 60, 240 and 320 minutes.

[0031] (9) Take 200 μL of the mixed solution for coating and culture observation, and take the untreated bacterial solution for coating as the control group. After culturing in a biochemical incubator for 24 hours, observe the growth of colonies and calculate the sterilization rate based on the colony situation. See the attached Figure 2 .

[0032] Embodiment 2:

[0033] (1) Take 0.5 g of sodium molybdate, 2 g of thiourea powder and 0.1 g of cobalt chloride (CoCl2·6H2O) and dissolve them in 100 ml of ethanol-water solution (ethanol:water volume ratio is 1:1).

[0034] (2) The mixed solution was placed in an ultrasonic processor and the ultrasonic treatment time was set to 20 minutes and the frequency was set to 60 kHz to ensure that the cobalt ions were evenly dispersed in the molybdenum disulfide.

[0035] (3) The solution after ultrasonic treatment was transferred to a rotary evaporator, set the temperature to 70°C, and evaporate under reduced pressure until a dry powder was obtained.

[0036] (4) The dried powder was placed in a magnetic induction heating furnace, and the heating current was set to 600 A and the heating time was set to 5 seconds to ensure that the cobalt element was uniformly doped into the molybdenum disulfide matrix.

[0037] (5) After the heating is completed, the mixture is naturally cooled to room temperature and the cobalt-modified molybdenum disulfide material is collected for later use.

[0038] (6) The prepared cobalt-modified molybdenum disulfide material is dispersed in deionized water to prepare a suspension with a concentration of 2 g / L.

[0039] (7) Take 100 ml of E. coli suspension (concentration is about 10 6 CFU / mL) and added to the beaker containing the suspension.

[0040] (8) Place the mixed solution beaker containing bacteria and materials on a magnetic stirrer and stir at 800 rpm for 30, 60, 240 and 320 minutes.

[0041] (9) Take 200 μL of the mixed solution for smear culture observation, and take the untreated bacterial solution for smear culture as the control group. After culturing in a biochemical incubator for 24 hours, observe the colony growth and calculate the sterilization rate based on the colony situation.

Claims

1. A method for ultra-fast synthesis of cobalt-modified molybdenum disulfide materials, comprising the following steps: (1) 100-500 mg of sodium molybdate, 100-500 mg of thiourea and 5-100 mg of cobalt chloride are dissolved in 5 mL to 50 mL of ethanol and treated with ultrasound to obtain a transparent solution. (2) Add 50 mg to 200 mg of carbon black to the above transparent solution and mix well. (3) The mixture was dried by rotary evaporation. (4) The dried mixture is further dried in a vacuum oven at 50° C. to 100° C. for 4 to 12 hours. (5) The dried material is loaded onto an iron sheet covered with a graphite paper with a thickness of 0.01 mm to 0.05 mm, and the size of the iron sheet is 2 cm to 5 cm×2 cm to 5 cm×0.1 mm to 0.5 mm. (6) Place the above assembly in a refractory brick inside a quartz tube and purge with high-purity inert gas for 5 to 30 minutes. (7) The quartz tube is placed in a multi-turn induction coil with a diameter of 3 cm to 7 cm and subjected to magnetic induction heating for 5 seconds to 30 seconds under a controlled current (X=50 to 800 A). (8) After magnetic induction heating, the sample is allowed to cool naturally to room temperature, and finally a cobalt-modified molybdenum disulfide-based piezoelectric catalytic material is obtained. (9) The prepared cobalt-modified molybdenum disulfide material was resuspended in 9 mL of 0.9% NaCl solution and placed in a centrifuge tube for ultrasonic treatment for 1 h. The treated resuspended solution was quickly mixed with 1 mL of the prepared Escherichia coli or Staphylococcus aureus solution, and the bacterial concentration in the mixed system was finally 10 5 CFU / mL, the piezoelectric material concentration was 1000 mg / L. (10) Place the mixed solution beaker containing bacteria and materials on a magnetic stirrer and stir at 800 rpm for 30, 60, 240 and 320 minutes. Take 200 μL of the mixed solution at different time points for coating and culture observation. Take the untreated bacterial solution for coating as a control group. After culturing in a biochemical incubator for 24 hours, observe the growth of the colonies and calculate the sterilization rate based on the colony situation.

2. The method according to claim 1, wherein the magnetic induction heating method is electromagnetic induction heating, ferromagnetic induction heating or infrared radiation magnetic induction heating.

3. The method according to claim 1, wherein the frequency of the magnetic induction heating is 50 kHz to 1 MHz, the power of the induction coil is 1 kMO to 10 kMO, and the time of the magnetic induction heating is 1 second to 60 seconds.

4. The method according to claim 1, wherein the loading amount of the cobalt chloride is 1-50wt%.

5. The method according to claim 1, wherein the molar ratio of sodium molybdate to thiourea is 1:1 to 1:

3. The method according to claim 1 , wherein the particle size of the carbon black is 10 nm to 100 nm.

7. The method according to claim 1, wherein in step (f), the flow rate of the inert gas is 50 mL / min to 500 mL / min.

8. The method according to claim 1, wherein the surface of the iron sheet is pretreated to improve the adhesion of the graphite paper.

9. The method according to claim 1, wherein the obtained cobalt / molybdenum disulfide-based piezoelectric catalytic material is used for piezoelectric catalytic sterilization and has high efficient catalytic performance and stability.

10. The method according to claim 1, wherein the molybdenum disulfide-based piezoelectric catalytic material is used for sterilization applications, including but not limited to water system sterilization and air sterilization treatment.

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