A photocatalytic antiviral and antibacterial cleanroom plate and its preparation method

Abstract

This invention discloses a photocatalytic antiviral and antibacterial cleanroom plate and its preparation method, belonging to the field of plate technology. The cleanroom plate includes a substrate and an antibacterial and antiviral composite photocatalytic material layer disposed on the outer surface of the substrate. The preparation method of the antibacterial and antiviral composite photocatalytic material includes the following steps: S1. Dispersing melamine and boric acid in deionized water, heating and stirring, drying, and then calcining at 1000-1200℃ for 3-5 hours, followed by cooling to 600-800℃ and natural cooling to obtain boron nitride material; S2. Dispersing a graphitic carbon nitride precursor in ethylene glycol, then adding the boron nitride material, stirring evenly to obtain a mixture, immersing carbon fiber cloth in the mixture, removing it, drying it, and then placing it in a muffle furnace for secondary calcination to obtain the antibacterial and antiviral composite photocatalytic material. The cleanroom plate of this invention effectively adsorbs and inactivates viruses under visible light irradiation, achieving an inactivation rate of over 97% for the novel coronavirus (Omeprone strain) in the visible light range, and can efficiently inhibit and kill viruses.

Description

Technical Field

[0001] This invention belongs to the field of sheet technology, specifically relating to a photocatalytic antiviral and antibacterial clean panel and its preparation method. Background Technology

[0002] Currently, the vast majority of antiviral boards use wood as their substrate. However, wood substrates have poor fire resistance, water resistance, corrosion resistance, environmental friendliness, and safety, and wood resources are relatively scarce in my country, leading to a year-on-year increase in the cost of wood substrates, making it difficult to meet the demands of modern decoration. Some research suggests using ordinary iron tailings as the substrate layer for decorative boards, which can provide fire resistance, water resistance, and corrosion resistance. However, because ordinary iron tailings have low levels of active ingredients, it takes a long time for them to take effect, and their weak bonding with materials can easily result in a loose structure, affecting the molding strength of the decorative board substrate layer. This leads to easy deformation during construction and use, and a short service life.

[0003] In public environments such as hospitals, shopping malls, and schools, the surface layers of decorative panels such as furniture boards, wall panels, and flooring are highly susceptible to the adhesion of viruses and bacteria. Conventional methods for eliminating these adhering viruses and bacteria involve spraying alcohol and 84 disinfectant. However, alcohol and disinfectants have short residual times, poor sterilization and disinfection persistence, requiring frequent use. Furthermore, alcohol is flammable, and disinfectants are highly irritating, posing safety hazards and high risks. Moreover, existing decorative panel surface layers lack antibacterial and antiviral capabilities or have unsatisfactory antibacterial and antiviral effects, making it easy for viruses and bacteria in public areas to spread to humans. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, one objective of this invention is to provide a photocatalytic antiviral and antibacterial cleanroom panel. The cleanroom panel of this invention has an antibacterial and antiviral composite photocatalytic material layer on its surface, which can effectively adsorb and inactivate viruses under visible light irradiation, and can efficiently inhibit and kill viruses, thus solving the problem of unsatisfactory antibacterial and antiviral effects of existing panel surface layers.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0006] A photocatalytic antiviral and antibacterial cleanroom panel includes a substrate and an antibacterial and antiviral composite photocatalytic material layer disposed on the outer surface of the substrate;

[0007] The antibacterial and antiviral composite photocatalytic material layer includes an antibacterial and antiviral composite photocatalytic material and an adhesive; the antibacterial and antiviral composite photocatalytic material includes boron nitride, carbon fiber cloth, and graphitic carbon nitride;

[0008] The preparation method of the antibacterial and antiviral composite photocatalytic material includes the following steps:

[0009] S1. Disperse melamine and boric acid in deionized water, heat and stir until melamine and boric acid are completely dissolved, cool and dry, then place at 1000-1200℃ for constant temperature calcination for 3-5 hours, then cool down to 600-800℃, and naturally cool to obtain boron nitride material;

[0010] S2. Disperse the graphite phase carbon nitride precursor in ethylene glycol, then add the boron nitride material obtained in step S1, stir evenly to obtain a mixture, immerse the carbon fiber cloth in the mixture, take it out and dry it, and then place it in a muffle furnace for secondary calcination to obtain an antibacterial and antiviral composite photocatalytic material.

[0011] The boron nitride material prepared by this invention is a porous fibrous material with a high specific surface area. In the composite photocatalytic material of this invention, boron nitride and carbon fiber cloth have high adsorption capacity, which can enrich viruses in the environment on the clean plate and increase the probability of contact between virus molecules and the composite photocatalytic material. At the same time, the synergistic effect of boron nitride and carbon fiber can improve the uniform distribution of graphitic carbon nitride on boron nitride and carbon fiber, and increase the specific surface area and stability of graphitic carbon nitride. Under the synergistic effect of boron nitride, carbon fiber and graphitic carbon nitride, the inactivation effect of antibacterial clean plate on viruses is enhanced. The resulting antibacterial clean plate can effectively adsorb and inactivate viruses under visible light irradiation, effectively inhibit and kill viruses, has a high inactivation efficiency for viruses, and has a high reusability rate.

[0012] Preferably, the mass ratio of boron nitride, carbon fiber cloth and graphite phase carbon nitride is (80-100):(5-6):1.

[0013] Preferably, in step S1, the mass ratio of melamine to boric acid is (1-1.5):1.

[0014] Preferably, in step S2, the graphitic carbon nitride precursor includes at least one of melamine, urea, and dicyandiamide.

[0015] Preferably, in step S2, the calcination temperature is 500-600℃ and the time is 2-4 hours.

[0016] Preferably, in step S2, the carbon fiber cloth is first ultrasonically dispersed in a mixed solution of water, ethanol, and acetone for 0.5–1 hour, then removed and soaked in aqua regia. After washing and drying, it is then soaked in the mixed solution again. The main purpose of ultrasonic dispersion in the mixed solution of water, ethanol, and acetone is to remove oily substances from the surface of the carbon fiber cloth and to disperse the fiber bundles. Soaking in aqua regia, using an acidification method, can remove impurities such as metals and amorphous carbon from the surface of the carbon fiber cloth.

[0017] Preferably, the adhesive includes at least one of epoxy resin adhesive, acrylic adhesive, polyurethane adhesive, and glue.

[0018] This invention also provides a method for preparing the photocatalytic antiviral and antibacterial clean plate, comprising the following steps:

[0019] P1. Mix the antibacterial and antiviral composite photocatalytic material and adhesive, stir evenly to obtain an adhesive solution; then evenly coat the adhesive solution onto the surface of the adhesive paper and dry the surface to obtain the impregnated paper;

[0020] P2. The impregnated paper obtained in step P1 is hot-pressed and fused with the substrate to obtain the photocatalytic antiviral and antibacterial clean plate.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] (1) Under the synergistic effect of boron nitride, carbon fiber and graphite phase carbon nitride, the present invention enhances the inactivation effect of antibacterial clean plate on virus. The resulting antibacterial clean plate effectively adsorbs and inactivates the virus under visible light irradiation. The inactivation rate of novel coronavirus (Omicron strain) in the visible light range is as high as 97% or more, which can effectively inhibit and kill the virus.

[0023] (2) The antibacterial and antiviral composite photocatalytic material of the present invention will not change or be lost during the reaction process and has a high reusability. Therefore, the clean plate can continue to play an antibacterial and antiviral role under visible light irradiation. It can be used for a long time as long as the surface is kept clean, without the need for replacement. Attached Figure Description

[0024] Figure 1 The detection conditions for the virus inactivation test of the antibacterial clean plate of the present invention;

[0025] Figure 2 This is the test report for the virus inactivation test of the antibacterial clean plate of this invention. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] This embodiment provides a photocatalytic antiviral and antibacterial cleanroom plate, the cleanroom plate comprising a calcium silicate board and an antibacterial and antiviral composite photocatalytic material layer disposed on the surface of the calcium silicate board;

[0029] The antibacterial and antiviral composite photocatalytic material layer includes an antibacterial and antiviral composite photocatalytic material and an adhesive; the antibacterial and antiviral composite photocatalytic material includes boron nitride, carbon fiber cloth and graphite phase carbon nitride in a mass ratio of 90:5.5:1.

[0030] The preparation method of antibacterial and antiviral composite photocatalytic materials includes the following steps:

[0031] S1. Melamine and boric acid in a mass ratio of 1.02:1 were dispersed in ultrapure water, heated to 90°C in a water bath, and stirred until the melamine and boric acid were completely dissolved. After cooling to room temperature, flocculent material was obtained. After drying at 90°C for 12 hours, the material was placed in a tube furnace and heated to 1100°C at a rate of 8°C / min in an NH3 atmosphere. The temperature was kept constant for 4 hours, and then cooled to 700°C at a rate of 5°C / min. After natural cooling, boron nitride material was obtained. As can be seen from the scanning electron microscope, the boron nitride material prepared in this embodiment is a porous fibrous material with a high specific surface area.

[0032] S2. The carbon fiber was placed in a mixed solution of water, ethanol and acetone (volume ratio 1:1:1) and ultrasonically treated for 30 min. After being removed, it was soaked in aqua regia for 24 h, then washed with deionized water and dried to obtain the pretreated carbon fiber cloth.

[0033] Melamine was dispersed in ethylene glycol, and then boron nitride material obtained in step S1 was added. The mixture was stirred until homogeneous. The pretreated carbon fiber cloth was immersed in the mixture and ultrasonically treated for 30 minutes. After removal, it was placed in a 60°C oven for drying. Then, it was placed in a muffle furnace and heated to 550°C at a heating rate of 5°C / min. It was then calcined for 3 hours and allowed to cool naturally to room temperature. After removal, it was washed three times with water and ethanol to obtain an antibacterial and antiviral composite photocatalytic material.

[0034] The preparation method of the photocatalytic antiviral and antibacterial clean plate in this embodiment includes the following steps:

[0035] P1. Mix the antibacterial and antiviral composite photocatalytic material and adhesive at a mass ratio of 25:75, stir well to obtain an adhesive solution; apply the adhesive solution evenly to the surface of the adhesive paper by rolling a brush, with a coating amount of 0.4 g / cm³. 2 Then, the surface is dried to obtain the impregnated paper;

[0036] P2. The impregnated paper obtained in step P1 is hot-pressed and fused with the substrate. The hot-pressing temperature is 180℃, the hot-pressing pressure is 19MPa, and the hot-pressing time is 20s, thus obtaining the photocatalytic antiviral and antibacterial clean plate.

[0037] The inactivation effect of the prepared clean plate on the novel coronavirus (Omeprón strain) was tested using the following method: (See below for specific testing conditions) Figure 1 (As shown)

[0038] (1) Preparation of virus suspension: Take a titer of 10 6 TCTD 50 / mL-10 7 TCTD 50 / mL of the novel coronavirus (Omicron BA.2.2 strain) was stored at room temperature for later use;

[0039] (2) Experimental group: 10 μL of virus suspension was dropped onto the coated surface of the plate, spread evenly, and allowed to dry for 20 minutes. After irradiation at a height of 5 cm under an excitation lamp for 60 minutes, the plate was placed in a 12-well cell culture plate containing 1 mL of cell maintenance medium. The virus was repeatedly eluted by pipetting and aspiration, and the virus was removed using TCTD. 50 Virus titration by titration method;

[0040] (3) Control group: The blank sample was a calcium silicate plate of the same material and specifications, but without an antibacterial and antiviral composite photocatalytic material layer on the surface. 10 μL of virus suspension was dropped onto the surface of the blank sample, spread evenly, and allowed to stand for 20 minutes to dry. After irradiation at a distance of 5 cm from the excitation lamp for 60 minutes, the virus was washed off and titrated according to the method of the experimental group. The negative control cells used the same batch of cell maintenance medium.

[0041] 4) Repeat the test: After testing the virus titer value, clean the clean plate with ultrasonic for 10 minutes, and then perform the second test. Repeat the above steps (1) to (3) 9 times.

[0042] The test results are as follows: Figure 2 As shown, after the clean plate in this embodiment was irradiated at a distance of 5 cm under a 30W double-ended fluorescent tube for 60 minutes, the average inactivation rate of the novel coronavirus (Omega strain) was 97% on the first irradiation and 95% on the ninth irradiation.

[0043] Example 2

[0044] This embodiment provides a photocatalytic antiviral and antibacterial cleanroom plate, the cleanroom plate comprising a calcium silicate board and an antibacterial and antiviral composite photocatalytic material layer disposed on the surface of the calcium silicate board;

[0045] The antibacterial and antiviral composite photocatalytic material layer includes an antibacterial and antiviral composite photocatalytic material and an epoxy resin adhesive; the antibacterial and antiviral composite photocatalytic material includes boron nitride, carbon fiber cloth and graphite phase carbon nitride in a mass ratio of 100:6:1.

[0046] The preparation method of antibacterial and antiviral composite photocatalytic materials includes the following steps:

[0047] S1. Melamine and boric acid in a mass ratio of 1.1:1 were dispersed in ultrapure water, heated to 90°C in a water bath, and stirred until melamine and boric acid were completely dissolved. After cooling to room temperature, flocculent material was obtained. After drying at 90°C for 12 hours, the material was placed in a tube furnace and heated to 1000°C at a rate of 8°C / min in an NH3 atmosphere. The material was calcined at a constant temperature for 5 hours, then cooled to 600°C at a rate of 5°C / min. After natural cooling, boron nitride material was obtained.

[0048] S2. The carbon fiber was placed in a mixed solution of water, ethanol and acetone (volume ratio 1:1:1) and ultrasonically treated for 30 min. After being removed, it was soaked in aqua regia for 24 h, then washed with deionized water and dried to obtain the pretreated carbon fiber cloth.

[0049] Melamine was dispersed in ethylene glycol, and then boron nitride material obtained in step S1 was added. The mixture was stirred evenly to obtain a solution. The pretreated carbon fiber cloth was immersed in the solution and ultrasonically treated for 30 minutes. After being removed, it was placed in a 60°C oven for drying. Then it was placed in a muffle furnace and heated to 500°C at a heating rate of 5°C / min. It was then calcined for 4 hours and allowed to cool naturally to room temperature. After being removed, it was washed three times with water and ethanol to obtain an antibacterial and antiviral composite photocatalytic material.

[0050] The preparation method of the photocatalytic antiviral and antibacterial clean plate in this embodiment includes the following steps:

[0051] P1. Mix the antibacterial and antiviral composite photocatalytic material and adhesive at a mass ratio of 30:70, stir evenly to obtain an adhesive solution; apply the adhesive solution evenly to the surface of the adhesive paper by rolling and brushing, and then dry the surface to obtain the impregnated paper;

[0052] P2. The impregnated paper obtained in step P1 is hot-pressed and fused with the substrate. The hot-pressing temperature is 160℃, the hot-pressing pressure is 16MPa, and the hot-pressing time is 15s, thus obtaining the photocatalytic antiviral and antibacterial clean plate.

[0053] Tests showed that after the clean plate of this embodiment was irradiated at a distance of 5 cm under a 30W double-ended fluorescent lamp for 60 minutes, the average inactivation rate of the novel coronavirus (Omeprón strain) was 95% on the first irradiation and 93% on the ninth irradiation.

[0054] Example 3

[0055] This embodiment provides a photocatalytic antiviral and antibacterial cleanroom plate, the cleanroom plate comprising a calcium silicate board and an antibacterial and antiviral composite photocatalytic material layer disposed on the surface of the calcium silicate board;

[0056] The antibacterial and antiviral composite photocatalytic material layer comprises an antibacterial and antiviral composite photocatalytic material and an acrylic adhesive; the antibacterial and antiviral composite photocatalytic material comprises boron nitride, carbon fiber cloth and graphitic carbon nitride in a mass ratio of 80:5:1.

[0057] The preparation method of antibacterial and antiviral composite photocatalytic materials includes the following steps:

[0058] S1. Melamine and boric acid in a mass ratio of 1.2:1 were dispersed in ultrapure water, heated to 90°C in a water bath, and stirred until melamine and boric acid were completely dissolved. After cooling to room temperature, flocculent material was obtained. After drying at 90°C for 12 hours, the material was placed in a tube furnace and heated to 1200°C at a rate of 8°C / min in an NH3 atmosphere. The temperature was kept constant for 3 hours, and then cooled to 800°C at a rate of 5°C / min. After natural cooling, boron nitride material was obtained.

[0059] S2. The carbon fiber was placed in a mixed solution of water, ethanol and acetone (volume ratio 1:1:1) and ultrasonically treated for 30 min. After being removed, it was soaked in aqua regia for 24 h, then washed with deionized water and dried to obtain the pretreated carbon fiber cloth.

[0060] Melamine was dispersed in ethylene glycol, and then boron nitride material obtained in step S1 was added. The mixture was stirred evenly to obtain a solution. The pretreated carbon fiber cloth was immersed in the solution and ultrasonically treated for 30 minutes. After being removed, it was placed in a 60°C oven for drying. Then it was placed in a muffle furnace and heated to 600°C at a heating rate of 5°C / min. It was calcined at this temperature for 2 hours and then naturally cooled to room temperature. After being removed, it was washed three times with water and ethanol to obtain an antibacterial and antiviral composite photocatalytic material.

[0061] The preparation method of the photocatalytic antiviral and antibacterial clean plate in this embodiment includes the following steps:

[0062] P1. Mix the antibacterial and antiviral composite photocatalytic material and adhesive at a mass ratio of 40:60, stir evenly to obtain an adhesive solution; apply the adhesive solution evenly to the surface of the adhesive paper by rolling and brushing, and then dry the surface to obtain the impregnated paper;

[0063] P2. The impregnated paper obtained in step P1 is hot-pressed and fused with the substrate. The hot-pressing temperature is 140℃, the hot-pressing pressure is 17MPa, and the hot-pressing time is 16s, thus obtaining the photocatalytic antiviral and antibacterial clean plate.

[0064] Tests showed that after the clean plate of this embodiment was irradiated at a distance of 5 cm under a 30W double-ended fluorescent lamp for 60 minutes, the average inactivation rate of the novel coronavirus (Omeprón strain) was 96% on the first irradiation and 94% on the ninth irradiation.

[0065] Comparative Example 1

[0066] This comparative example is basically the same as Example 1, except that the antibacterial and antiviral composite photocatalytic material in this comparative example includes carbon fiber cloth and graphitic carbon nitride in a mass ratio of 95.5:1, and its preparation method includes the following steps:

[0067] Carbon fibers were placed in a mixed solution of water, ethanol and acetone (volume ratio 1:1:1) and ultrasonically treated for 30 min. After being removed, they were soaked in aqua regia for 24 h, washed with deionized water, and dried to obtain the pretreated carbon fiber cloth.

[0068] Melamine was dispersed in ethylene glycol and stirred evenly to obtain a mixture. The pretreated carbon fiber cloth was immersed in the mixture and ultrasonically treated for 30 minutes. After being removed, it was placed in a 60°C oven for drying. Then, it was placed in a muffle furnace and heated to 550°C at a heating rate of 5°C / min. It was then calcined at this temperature for 3 hours and allowed to cool naturally to room temperature. After being removed, it was washed three times with water and ethanol to obtain an antibacterial and antiviral composite photocatalytic material.

[0069] Tests showed that after the clean plate in this comparative example was irradiated for 60 minutes at a distance of 5 cm under a 30W double-ended fluorescent lamp, the average inactivation rate of the novel coronavirus (Omecron strain) was 56% on the first irradiation and 45% on the ninth irradiation.

[0070] Comparative Example 2

[0071] This comparative example is basically the same as Example 1, except that the antibacterial and antiviral composite photocatalytic material in this comparative example includes boron nitride and graphitic carbon nitride in a mass ratio of 95.5:1, and its preparation method includes the following steps:

[0072] S1. Melamine and boric acid in a mass ratio of 1.02:1 were dispersed in ultrapure water, heated to 90°C in a water bath, and stirred until melamine and boric acid were completely dissolved. After cooling to room temperature, flocculent material was obtained. After drying at 90°C for 12 hours, the material was placed in a tube furnace and heated to 1100°C at a rate of 8°C / min in an NH3 atmosphere. The material was calcined at a constant temperature for 4 hours, then cooled to 700°C at a rate of 5°C / min. After natural cooling, boron nitride material was obtained.

[0073] S2. Melamine is dispersed in ethylene glycol, and then boron nitride material obtained in step S1 is added. The mixture is stirred evenly to obtain a solution. After filtration, washing, and drying, the solution is placed in a muffle furnace and heated to 550°C at a heating rate of 5°C / min. The solution is then calcined at this temperature for 3 hours and allowed to cool naturally to room temperature. The solution is then removed and washed three times with water and ethanol to obtain an antibacterial and antiviral composite photocatalytic material.

[0074] Tests showed that the clean plate in this comparative example, after being irradiated for 60 minutes at a distance of 5 cm under a 30W double-ended fluorescent lamp, had an average inactivation rate of 67% against the novel coronavirus (Omecron strain), and an average inactivation rate of 51% against the novel coronavirus (Omecron strain) after the ninth irradiation.

[0075] Compared with Example 1, the composite photocatalytic material of Comparative Example 1 lacked boron nitride and correspondingly increased the amount of carbon fiber cloth. The composite photocatalytic material of Comparative Example 2 lacked carbon fiber cloth and correspondingly increased the amount of boron nitride. However, the average inactivation rate of the novel coronavirus on the clean plate was significantly reduced. This indicates that the synergy between boron nitride and carbon fiber cloth can improve the uniform distribution of graphitic carbon nitride on boron nitride and carbon fiber cloth, thereby improving the inactivation efficiency of the composite photocatalytic material against the novel coronavirus.

[0076] Comparative Example 3

[0077] This comparative example is basically the same as Example 1, except that the antibacterial and antiviral composite photocatalytic material in this comparative example includes boron nitride, carbon fiber cloth and graphite phase carbon nitride in a mass ratio of 90:5.5:1.

[0078] The preparation method of antibacterial and antiviral composite photocatalytic materials includes the following steps:

[0079] S1. Melamine and boric acid in a mass ratio of 1.02:1 were dispersed in ultrapure water, heated to 90°C in a water bath, and stirred until melamine and boric acid were completely dissolved. After cooling to room temperature, flocculent material was obtained. After drying at 90°C for 12 hours, the material was placed in a tube furnace and heated to 900°C at a rate of 8°C / min in a N2 atmosphere. The material was calcined at a constant temperature for 5 hours and then cooled naturally to obtain boron nitride material.

[0080] S2. The carbon fiber was placed in a mixed solution of water, ethanol and acetone (volume ratio 1:1:1) and ultrasonically treated for 30 min. After being removed, it was soaked in aqua regia for 24 h, then washed with deionized water and dried to obtain the pretreated carbon fiber cloth.

[0081] Boron nitride was dispersed in ultrapure water and ultrasonically dispersed for 3 hours to obtain a boron nitride dispersion. Graphite-phase carbon nitride was dispersed in ultrapure water and ultrasonically dispersed for 3 hours to obtain a carbon nitride dispersion. The boron nitride dispersion and carbon nitride dispersion were then mixed and added to carbon fiber cloth, ultrasonically dispersed for 2 hours, filtered, dried, and then kept at 350℃ for 2 hours to obtain an antibacterial and antiviral composite photocatalytic material.

[0082] Tests showed that the clean plate in this comparative example, after being irradiated for 60 minutes at a distance of 5 cm under a 30W double-ended fluorescent lamp, had an average inactivation rate of 70% against the novel coronavirus (Omecron strain), and the average inactivation rate against the novel coronavirus (Omecron strain) was 60% after the ninth irradiation.

[0083] Compared with Example 1, Comparative Example 3 changed the preparation method of the antibacterial and antiviral composite photocatalytic material. Scanning electron microscopy revealed that boron nitride was in the form of yarn wrapped around the surface of the composite photocatalyst. This structure could not effectively improve the uniform distribution of carbon nitride, and the inactivation efficiency of the composite photocatalytic material against the novel coronavirus was significantly reduced.

[0084] Comparative Example 4

[0085] This comparative example is basically the same as Example 1, except that the antibacterial and antiviral composite photocatalytic material in this comparative example includes boron nitride, carbon fiber cloth and nano titanium dioxide in a mass ratio of 90:5.5:1.

[0086] Tests showed that the clean plate in this comparative example, after being irradiated for 60 minutes at a distance of 5 cm under a 30W double-ended fluorescent lamp, had an average inactivation rate of 78% against the novel coronavirus (Omecron strain), and an average inactivation rate of 66% against the novel coronavirus (Omecron strain) after the ninth irradiation.

[0087] Compared to Example 1, Comparative Example 4 replaced graphitic carbon nitride with nano-titanium dioxide, resulting in a significant decrease in the inactivation efficiency of the composite photocatalytic material against the novel coronavirus. This indicates that the combined action of boron nitride, carbon fiber cloth, and graphitic carbon nitride is necessary to effectively improve the inactivation efficiency of the composite photocatalytic material against the novel coronavirus.

[0088] The above results demonstrate that the synergistic effect of boron nitride, carbon fiber, and graphitic carbon nitride enhances the inactivation effect of the antibacterial cleanroom plate against viruses. This results in an inactivation rate of over 97% against the novel coronavirus in the visible light range, effectively inhibiting and killing the virus. Furthermore, the antibacterial and antiviral composite photocatalyst material remains unchanged and undamaged during the reaction process, exhibiting high reusability. The cleanroom plate can sustain its antibacterial and antiviral effects under visible light irradiation, requiring only surface cleanliness for long-term use. Changing the composition or preparation method of the composite photocatalyst will reduce its inactivation effect against the novel coronavirus.

[0089] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A photocatalytic antiviral and antibacterial cleanroom plate, characterized in that, It includes a substrate and an antibacterial and antiviral composite photocatalytic material layer disposed on the outer surface of the substrate; The antibacterial and antiviral composite photocatalytic material layer includes an antibacterial and antiviral composite photocatalytic material and an adhesive; the antibacterial and antiviral composite photocatalytic material includes boron nitride, carbon fiber cloth, and graphitic carbon nitride; The preparation method of the antibacterial and antiviral composite photocatalytic material includes the following steps: S1. Disperse melamine and boric acid in deionized water, heat and stir until melamine and boric acid are completely dissolved, cool and dry, then place at 1000-1200℃ for constant temperature calcination for 3-5 hours, then cool down to 600-800℃, and naturally cool to obtain boron nitride material; S2. Disperse the graphite phase carbon nitride precursor in ethylene glycol, then add the boron nitride material obtained in step S1, stir evenly to obtain a mixture, immerse the carbon fiber cloth in the mixture, take it out and dry it, and then place it in a muffle furnace for secondary calcination to obtain an antibacterial and antiviral composite photocatalytic material.

2. The photocatalytic antiviral and antibacterial cleanroom plate according to claim 1, characterized in that, The mass ratio of boron nitride, carbon fiber cloth, and graphite phase carbon nitride is (80-100):(5-6):

1.

3. The photocatalytic antiviral and antibacterial cleanroom plate according to claim 1, characterized in that, In step S1, the mass ratio of melamine to boric acid is (1-1.5):

1.

4. The photocatalytic antiviral and antibacterial cleanroom plate according to claim 1, characterized in that, In step S2, the graphitic carbon nitride precursor includes at least one of melamine, urea, and dicyandiamide.

5. The photocatalytic antiviral and antibacterial cleanroom plate according to claim 1, characterized in that, In step S2, the temperature of the secondary calcination is 500-600℃, and the time is 2-4 hours.

6. The photocatalytic antiviral and antibacterial cleanroom plate according to claim 1, characterized in that, In step S2, the carbon fiber cloth is first placed in a mixed solution of water, ethanol and acetone and ultrasonically dispersed for 0.5 to 1 hour. After being taken out, it is soaked in aqua regia. After washing and drying, it is then soaked in the mixed solution again.

7. The photocatalytic antiviral and antibacterial cleanroom plate according to claim 1, characterized in that, The adhesive includes at least one of epoxy resin adhesive, acrylic adhesive, polyurethane adhesive, and glue.

8. The method for preparing the photocatalytic antiviral and antibacterial clean plate according to any one of claims 1 to 7, characterized in that, Includes the following steps: P1. Mix the antibacterial and antiviral composite photocatalytic material and adhesive, stir evenly to obtain an adhesive solution; then evenly coat the adhesive solution onto the surface of the adhesive paper and dry the surface to obtain the impregnated paper; P2. The impregnated paper obtained in step P1 is hot-pressed and fused with the substrate to obtain the photocatalytic antiviral and antibacterial clean plate.

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