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

Abstract

According to the method for synthesizing the cobalt-modified tungsten disulfide material in a second-level ultra-fast mode, through the combination of ultrasonic treatment, rotary evaporation and magnetic induction heating technologies, the preparation time of the material is remarkably shortened, and meanwhile the catalytic performance of the material is improved. The method is simple and convenient to operate, efficient and suitable for large-scale production. 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 ultra-fast synthesis of cobalt-modified tungsten disulfide material and its piezoelectric catalytic sterilization application, in particular to a method for rapidly preparing cobalt-modified tungsten disulfide piezoelectric catalytic material by magnetic induction heating and its application in the sterilization field, belonging to the field of environmental engineering technology. [Background technology]

[0002] With the development of society and the advancement of science and technology, the problems of infection and disease caused by bacteria are becoming increasingly serious, especially in the fields of medical health, food safety and public environment. There is an urgent need for effective sterilization technology. 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 certain temperature-sensitive items. Therefore, there is an urgent need to develop new, efficient and environmentally friendly sterilization technologies.

[0003] Piezoelectric catalytic technology has attracted much attention in recent years due to its high efficiency and environmental friendliness in the field of sterilization. Tungsten disulfide (WS2), as a transition metal sulfide, shows good prospects in sterilization applications due to its unique layered structure and excellent catalytic performance. However, pure tungsten disulfide 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 methods to modify tungsten disulfide, such as doping with metal elements, to improve its conductivity and catalytic activity.

[0004] Cobalt (Co), as a transition metal, is an ideal doping element due to its variable oxidation state and unique electronic structure. Cobalt-modified tungsten disulfide materials show better catalytic performance than pure tungsten disulfide. However, the existing synthesis methods of cobalt-modified tungsten disulfide materials generally have problems such as cumbersome steps, long time consumption and high cost, making it difficult to achieve large-scale preparation and application.

[0005] The present invention proposes a method for ultra-fast synthesis of cobalt-modified tungsten disulfide materials in seconds. By combining ultrasonic treatment, rotary evaporation and magnetic induction heating technology, the preparation time of the material is significantly shortened, while the catalytic performance of the material is improved. The method is not only simple to operate and efficient, but also suitable for large-scale production.

[0006] In addition, cobalt-modified tungsten disulfide materials show 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 effects. 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 and health care, food safety, and the protection of the public environment. [Summary of the invention]

[0007] [Technical issues to be solved]

[0008] The purpose of the present invention is to provide a method for ultra-fast synthesis of cobalt-modified tungsten disulfide materials and their piezoelectric catalytic sterilization applications. The method overcomes the complexity and high cost problems existing in traditional methods by solid-phase reaction magnetic induction heating. The method is simple to operate and has a short preparation time. It can prepare efficient cobalt-modified tungsten 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 the fields of water, air and daily life sterilization.

[0009] [Technical solution]

[0010] A method for ultra-fast synthesis of cobalt-modified tungsten disulfide material and its piezoelectric catalytic sterilization application, characterized in that the ultra-fast synthesis of cobalt-modified tungsten disulfide material comprises the following steps:

[0011] (1) 0.1-5 g of sodium tungstate, 0.1-10 g of thiourea and 5-100 mg of cobalt chloride are dissolved in 5 mL to 50 mL of ethanol and treated by ultrasonication to obtain a transparent solution.

[0012] (2) Add 50 mg to 200 mg of carbon black to the above transparent solution and mix well.

[0013] (3) The mixture was dried by rotary evaporation.

[0014] (4) The dried mixture is further dried in a vacuum oven at 50° C. to 100° C. for 4 to 12 hours.

[0015] (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.

[0016] (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.

[0017] (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).

[0018] (8) After magnetic induction heating, the sample is allowed to cool naturally to room temperature, and finally a cobalt-modified tungsten disulfide-based piezoelectric catalytic material is obtained.

[0019] [Beneficial Effects]

[0020] Cobalt-modified tungsten disulfide materials show remarkable effects in piezoelectric catalytic sterilization. Active species generated by piezoelectric catalytic reactions, such as hydroxyl radicals and superoxide anions, can effectively destroy bacterial cell walls and cell membranes, thereby achieving efficient sterilization effects. 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 and health care, food safety, and the protection of the public environment.

Brief Description of the Drawings

[0021] Figure 1 : A transmission electron microscope (TEM) image of the cobalt / WS2 piezoelectric catalytic material prepared after Example 1 is shown, showing its microstructure.

[0022] Figure 2 : The piezoelectric response current diagram of the cobalt / WS2 piezoelectric catalytic material prepared after Example 1 is shown, showing its piezoelectric catalytic current response.

[0023] Figure 3 :The effect diagram of the cobalt / WS2 piezoelectric catalytic material prepared after Example 1 in sterilization is shown, illustrating its application potential in sterilization in multiple scenarios. [Specific implementation method]

[0024] Embodiment 1:

[0025] (1) Take 1 g of sodium tungstate 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.

[0026] (2) The mixed solution is placed in an ultrasonic processor and the ultrasonic treatment time is set to 30 minutes and the frequency is set to 40 kHz to ensure that the cobalt ions are evenly dispersed in the tungsten disulfide.

[0027] (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.

[0028] (4) The dried powder is placed in a magnetic induction heating furnace, and the heating current is set to 500 A and the heating time is set to 10 seconds to ensure that the cobalt element is uniformly doped into the tungsten disulfide matrix.

[0029] (5) After the heating is completed, the mixture is naturally cooled to room temperature, and the cobalt-modified tungsten disulfide material is collected. Its morphology and structure are observed by transmission electron microscopy. Figure 1 , the piezoelectric response is tested as shown in the attached Figure 2 .

[0030] (6) The prepared cobalt-modified tungsten disulfide material is dispersed in deionized water to prepare a suspension with a concentration of 1 g / L.

[0031] (7) Take 100 ml of E. coli suspension (concentration is about 106 CFU / mL) and add it to the beaker containing the suspension.

[0032] (8) Place the mixed solution beaker containing bacteria and materials on a magnetic stirrer and stir at 800 rpm for 30 minutes.

[0033] (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.

[0034] Embodiment 2:

[0035] (1) Take 0.5 g of sodium tungstate, 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).

[0036] (2) The mixed solution is placed in an ultrasonic processor and the ultrasonic treatment time is set to 20 minutes and the frequency is set to 60 kHz to ensure that the cobalt ions are evenly dispersed in the tungsten disulfide.

[0037] (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.

[0038] (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 tungsten disulfide matrix.

[0039] (5) After heating, the mixture is naturally cooled to room temperature and the cobalt-modified tungsten disulfide material is collected for later use.

[0040] (6) The prepared cobalt-modified tungsten disulfide material is dispersed in deionized water to prepare a suspension with a concentration of 2 g / L.

[0041] (7) Take 100 ml of E. coli suspension (concentration is about 106 CFU / mL) and add it to the beaker containing the suspension.

[0042] (8) Place the mixed solution beaker containing bacteria and materials on a magnetic stirrer and stir at 800 rpm for 30 minutes.

[0043] (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 tungsten disulfide material, comprising the following steps: (1) 0.1-5 g of sodium tungstate, 0.1-10 g of thiourea and 5-100 mg of cobalt chloride are dissolved in 5 mL to 50 mL of ethanol and treated by ultrasonication 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 tungsten disulfide-based piezoelectric catalytic material is obtained. (9) The prepared cobalt-modified tungsten 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 minutes. Take 200 μL of the mixed solution 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 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 kW to 10 kW, 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 wt-50 wt%.

5. The method according to claim 1, wherein the molar ratio of sodium tungstate 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 (6), 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 / tungsten disulfide-based piezoelectric catalytic material is used for piezoelectric catalytic sterilization and has high catalytic performance and stability.

10. The method according to claim 1, wherein the tungsten 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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