Silver-loaded copper oxide nanoarray photocatalytic antibacterial material and its preparation and application

Abstract

The present invention discloses a silver-loaded copper oxide nanoarray photocatalytic antibacterial material and its preparation and application. The material comprises a base copper mesh and an Ag / CuO-Vo nanoarray in-situ grown on the copper mesh. The Ag / CuO-Vo nanoarray comprises a CuO-Vo nanoarray and nanosilver loaded on the surface of the CuO-Vo nanoarray. The CuO-Vo nanoarray is a CuO nanoarray with oxygen vacancies (V), has high sterilization efficiency, and is simple to prepare.

Description

[0001] Process field

[0002] The present invention relates to the technical field of catalytic materials, and in particular to a silver-loaded copper oxide nano-array photocatalytic antibacterial material and its preparation and application. Background Art

[0003] Pathogenic contamination of surface water in rivers, lakes, and other areas is becoming increasingly serious due to human-induced wastewater discharge, such as industrial, rural, and urban wastewater. For example, wastewater discharged from biopharmaceutical plants, hospitals, slaughterhouses, and aquaculture farms contains large amounts of Escherichia coli, Salmonella, Shigella, and Staphylococcus, contaminating surface water sources and soil, ultimately endangering human health. Therefore, developing technologies to treat pathogenic microbial contamination in wastewater discharge is crucial to remove pathogens from water bodies.

[0004] Compared with traditional sterilization processes such as ultraviolet, chlorine water, and ozone sterilization, the photocatalytic process is an advanced oxidation process with low cost, high energy utilization, clean and pollution-free, and thorough purification. It can destroy bacterial cell membranes, DNA, proteins, etc. to kill bacteria.

[0005] However, the photocatalyst preparation process reported by current research is complex, has poor absorption of visible light, and has low efficiency in inactivating pathogenic microorganisms. Summary of the Invention

[0006] In view of this, the present application provides a silver-loaded copper oxide nanoarray photocatalytic antibacterial material and its preparation and application, which has high sterilization efficiency and a simple material preparation method.

[0007] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0008] In the first aspect, the present application provides a silver-loaded copper oxide nanoarray photocatalytic antibacterial material, comprising a base copper mesh and an Ag / CuO-Vo nanoarray in situ grown on the copper mesh; the Ag / CuO-Vo nanoarray comprises a CuO-Vo nanoarray and nanosilver loaded on the surface of the CuO-Vo nanoarray, and the CuO-Vo nanoarray is a CuO nanoarray with oxygen vacancies Vo.

[0009] In a second aspect, the present application provides a method for preparing a silver-loaded copper oxide nanoarray photocatalytic antibacterial material, comprising the following steps:

[0010] S1. calcining a clean copper mesh to obtain a copper mesh having a CuO nanoparticle array;

[0011] S2. Laser engraving of the front and back surfaces of a copper mesh with a CuO nanoparticle array using a laser 3D printing process to obtain a copper mesh with a CuO-Vo nanoparticle array;

[0012] S3. The copper mesh with CuO-Vo nanoarray is immersed in a silver nitrate solution, and then laser engraved on both sides using a laser 3D printing process to obtain a copper mesh with Ag / CuO-Vo nanoarray, which is a silver-loaded copper oxide nanoarray photocatalytic antibacterial material.

[0013] Preferably, in step S2 and step S3, the power of laser 3D printing is 1-5W, the depth of laser 3D printing is 2-5nm, and the light source of laser 3D printing is one or more of blue light, infrared light, and ultraviolet light.

[0014] Preferably, in step S2 and step S3, the light source for laser 3D printing is one or more of blue light, infrared light, and ultraviolet light.

[0015] Preferably, the calcination temperature is 500-600° C., the calcination heating rate is 10-15° C. / min, and the calcination time is 3-5 h.

[0016] Preferably, the concentration of the silver nitrate solution is 0.1-1 mg / ml.

[0017] Preferably, the mesh size of the copper mesh is 80-180 meshes.

[0018] Preferably, in step S3, the copper mesh with the CuO-Vo nanoarray is immersed in a silver nitrate solution, taken out, washed, and dried to obtain a copper mesh with an AgNO3 / CuO-Vo nanoarray, and then the copper mesh with the AgNO3 / CuO-Vo nanoarray is laser engraved on both sides using a laser 3D printing process to obtain a copper mesh with an Ag / CuO-Vo nanoarray, which is a silver-loaded copper oxide nanoarray photocatalytic antibacterial material.

[0019] In a third aspect, the present application provides an application of a silver-loaded copper oxide nanoarray photocatalytic antibacterial material in water pollution control.

[0020] Preferably, the silver-loaded copper oxide nanoarray photocatalytic antibacterial material performs catalytic sterilization under visible light irradiation.

[0021] The beneficial effects of the present application are as follows: The present application prepares silver-loaded copper oxide nanoarray photocatalytic antibacterial materials based on the laser 3D printing process, with few operating steps, a simple and efficient method; the silver-loaded copper oxide nanoarray photocatalytic antibacterial material is rich in oxygen vacancies and active oxygen species, and has a suitable band gap in photocatalysis, has a good response in the visible light range, and can produce a plasma effect under light conditions, promote the separation of photogenerated carriers of the photocatalyst, has an efficient sterilization effect, and has the effects of oxidative stress damage, physical damage, and chemical disinfection, which makes up for the shortcomings of the existing catalyst synthesis method being complex and having low sterilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of laser 3D printing technology.

[0023] In the figure: 1. Laser head; 2. Blue light; 3. Ag / CuO-V O Nanoarray agents.

[0024] Figure 2 Schematic diagrams of SEM and EDS for each material in Example 1; wherein, Figure 2 a is the SEM diagram of the copper mesh at 10 μm; Figure 2 b is a SEM diagram of 10 μm copper oxide nanoarrays grown in situ on a copper mesh substrate; Figure 2 c is the in-situ growth of AgNO3 / CuO-V using the laser 3D printing technology as the substrate of copper mesh O SEM schematic diagram of nanoarray at 1 μm; Figure 2 d is the in-situ growth of Ag / CuO-V using laser 3D printing technology on a copper mesh substrate. O SEM schematic diagram of nanoarray at 10 μm; Figure 2 e is the in-situ growth of Ag / CuO-V using laser 3D printing technology on a copper mesh substrate. O SEM schematic diagram of nanoarray at 1 μm; Figure 2 f is the in-situ growth of Ag / CuO-V using laser 3D printing technology on a copper mesh substrate. O Schematic diagram of EDS of nanoarray.

[0025] Figure 3 The Ag / CuO-V prepared by laser 3D printing technology with copper mesh as the substrate in Example 1 O Schematic diagram of XRD and EPR oxygen vacancies of nanoarrays; Figure 3 a is a copper mesh substrate with in-situ growth of copper oxide nanoarrays and Ag / CuO-V O XRD schematic diagram of nanoarray; Figure 3 b is the in-situ growth of Ag / CuO-V using a copper mesh as the substrate using laser 3D printing technology O Nanoarrays, Ag / CuO, CuO-V O , Schematic diagram of EPR oxygen vacancy characterization of CuO.

[0026] Figure 4 is the performance diagram of different catalysts in inactivating Escherichia coli; Figure 4 a is a schematic diagram of E. coli survival observed using the plate coating method with different catalysts; Figure 4 b is a schematic diagram of the performance of different catalysts in inactivating E. coli; Figure 4 c is Ag / CuO-VO Schematic diagram of the nanoarray's E. coli inactivation performance at different times; Figure 4 d is Ag / CuO-V loaded with different concentrations of silver nitrate O Schematic diagram of the nanoarray's performance in inactivating E. coli; Figure 4 e is Ag / CuO-V with different mesh sizes O Schematic diagram of the nanoarray's performance in inactivating E. coli. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The present application provides a silver-loaded copper oxide nanoarray photocatalytic antibacterial material, comprising a base copper mesh and an Ag / CuO-Vo nanoarray in situ grown on the copper mesh; the Ag / CuO-Vo nanoarray comprises a CuO-Vo nanoarray and nanosilver loaded on the surface of the CuO-Vo nanoarray, and the CuO-Vo nanoarray is a CuO nanoarray with oxygen vacancies Vo.

[0029] CuO can enhance the specific surface area and optical activity of photocatalysts, while silver has a strong plasmon resonance effect, which can promote the separation of photogenerated carriers, thereby increasing the production of reactive oxygen species. Both have a certain bactericidal effect. The inventors have found that Ag / CuO catalysts without oxygen vacancies (Vo) rely solely on the oxidative stress of silver and copper oxide to inactivate microorganisms. This inactivation efficiency is low, and they have poor visible light absorption and cannot produce sufficient reactive oxygen species. The silver-loaded copper oxide nanoarray photocatalytic antibacterial material of this application, based on the Ag / CuO catalyst, promotes the rapid and easy formation of oxygen vacancies (Vo) in copper oxide by adjusting the energy of the laser. On the one hand, oxygen vacancies Vo can regulate the electronic structure of the copper oxide surface, improve light absorption performance, and promote carrier separation. As active sites, they enable photogenerated electrons to be efficiently transferred from copper oxide to oxygen molecules, effectively promoting the adsorption and activation of molecular O2, thereby promoting the generation of active oxygen species. On the other hand, oxygen vacancies Vo are conducive to copper oxide (CuO) to load more silver nitrate (AgNO3), because the presence of oxygen vacancies can promote silver (Ag) to transfer electrons to copper oxide (CuO), generating AgNO3. + , enhancing antibacterial activity.

[0030] The present application provides a method for preparing a silver-loaded copper oxide nanoarray photocatalytic antibacterial material, comprising the following steps:

[0031] S1. calcining a clean copper mesh to obtain a copper mesh having a CuO nanoparticle array;

[0032] S2. Laser 3D printing was used to laser engrave the front and back of a copper mesh with CuO nanoparticle arrays to obtain a copper mesh with CuO-Vo nanoparticle arrays. The laser 3D printing process relies on a laser engraver (model: D2-7W). By adjusting the power and engraving depth of the laser engraver, the CuO-Vo nanoparticle arrays can be grown in situ on the copper mesh using the laser 3D printing process.

[0033] S3. The copper mesh with the CuO-Vo nanoarray is immersed in a silver nitrate solution to obtain a copper mesh with an AgNO3 / CuO-Vo nanoarray. The copper mesh with the AgNO3 / CuO-Vo nanoarray is then laser engraved on both sides using a laser 3D printing process to obtain a copper mesh with an Ag / CuO-Vo nanoarray, which is a silver-loaded copper oxide nanoarray photocatalytic antibacterial material.

[0034] This application uses copper mesh and silver nitrate as raw materials. First, a copper oxide nanoarray is grown in situ via calcination. Next, a laser 3D printing process is used to engrave the CuO nanoarray, creating oxygen vacancies (Vo). The nanoarray is then immersed in a silver nitrate solution. Finally, a further engraving process is performed using laser 3D printing to prepare an Ag / CuO-Vo nanoarray catalyst containing oxygen vacancies that exhibits excellent response in the visible light region. Laser 3D printing primarily induces the formation of CuO surface defects through rapid thermal excitation.

[0035] In step S2, the power of the laser 3D printing, i.e., the laser engraving machine, is set to 1-5W, the depth of the laser 3D printing, i.e., the laser engraving machine, is set to 2-5nm, and the light source of the laser 3D printing, i.e., the laser engraving machine, is set to one or more of blue light, infrared light, and ultraviolet light; laser 3D printing in step S2 can cause certain defects (Vo) on the surface of the copper oxide mesh array, which can not only better promote the loading of silver nitrate, but also the oxygen vacancies can adjust the electronic structure of the copper oxide surface, and can serve as active sites to promote molecular activation; if the laser power and engraving depth are too high, the CuO nanoarray on the copper mesh surface may be easily destroyed; if the laser power and engraving depth are too low, the oxygen vacancy generation conditions may not be met.

[0036] In step S3, the power of the laser 3D printing, i.e., the laser engraving machine, is set to 1-5W, the depth of the laser 3D printing, i.e., the laser engraving machine, is set to 2-5nm, and the light source of the laser 3D printing, i.e., the laser engraving machine, is set to one or more of blue light, infrared light, and ultraviolet light; in step S3, laser engraving using laser 3D printing can remove volatile impurities on the surface of the material, such as H2O and NOx, and at the same time convert silver ions into nanosilver loaded on the CuO-Vo nanoarray.

[0037] The calcination temperature is 500-600° C., the calcination heating rate is 10-15° C. / min, and the calcination time is 3-5 hours, so that the red copper mesh is converted into a copper mesh with a black copper oxide nanoarray on the surface.

[0038] The concentration of the silver nitrate solution is 0.1-1 mg / ml, and the immersion time is 3-5 minutes. A high silver nitrate content will cover the copper oxide nanoarray, so that the catalyst material cannot achieve a good photocatalytic effect.

[0039] The mesh number of the copper mesh is 80-180 meshes, including but not limited to 80 meshes, 120 meshes, and 180 meshes; the copper content in the copper mesh is about 99.99%.

[0040] In step S3, the copper mesh with the CuO-Vo nanoarray is immersed in a silver nitrate solution, taken out, washed, and dried, and then laser engraved on both sides using a laser engraving machine to obtain a copper mesh with an Ag / CuO-Vo nanoarray, which is a silver-loaded copper oxide nanoarray photocatalytic antibacterial material.

[0041] The present invention has few operating steps, is simple and efficient, and is inexpensive and readily available. A black Ag / CuO-Vo nanoarray catalyst rich in oxygen vacancies is obtained by calcining a copper mesh, impregnating it with a silver nitrate solution, and then laser 3D printing. The oxygen vacancies serve as electron capture centers, effectively promoting the adsorption and activation of O2 and generating more active oxygen species. The Ag / CuO-Vo nanoarray catalyst prepared using the laser 3D printing process has a suitable band gap in photocatalysis, has a good response in the visible light range, and can generate a plasma effect under light conditions, promoting the separation of photogenerated carriers in the photocatalyst, thereby promoting the generation of active oxygen species.

[0042] The present application provides an application of a silver-loaded copper oxide nanoarray photocatalytic antibacterial material in water pollution control.

[0043] The silver-loaded copper oxide nanoarray photocatalytic antibacterial material performs catalytic sterilization under visible light irradiation. The silver-loaded copper oxide nanoarray photocatalytic antibacterial material of the present application can promote the generation of more reactive oxygen species under visible light irradiation conditions. Specifically, under the action of light, the photogenerated electrons and holes of the silver-loaded copper oxide nanoarray photocatalytic antibacterial material are promoted to separate and combine with O2 or water molecules to produce more highly oxidizing reactive oxygen species, such as: O 2- , ·OH, 1 O2, thereby destroying the bacterial cell membrane, DNA, protein, etc. to kill the bacteria; the silver-loaded copper oxide nanoarray photocatalytic antibacterial material of the present application has a highly efficient sterilization effect, and has the effects of oxidative stress damage, physical damage, and chemical disinfection, which makes up for the shortcomings of the existing catalyst synthesis method being complex and having low sterilization efficiency.

[0044] The present invention is further described below through specific examples.

[0045] Example 1

[0046] A silver-loaded copper oxide nanoarray photocatalytic antibacterial material comprises a base copper mesh and an Ag / CuO-Vo nanoarray in-situ grown on the copper mesh; the Ag / CuO-Vo nanoarray comprises a CuO-Vo nanoarray and nanosilver loaded on the surface of the CuO-Vo nanoarray; the CuO-Vo nanoarray is a CuO nanoarray with oxygen vacancies Vo.

[0047] The preparation method of the silver-loaded copper oxide nanoarray photocatalytic antibacterial material is as follows:

[0048] S1. First, cut the 80-mesh copper mesh into a 4cm×4cm square shape, place the square copper mesh in a beaker filled with deionized water, wash away the particulate impurities on the surface of the copper mesh, and ultrasonically clean it. The copper mesh with the removed particulate impurities is immersed in a beaker filled with anhydrous ethanol and ultrasonically cleaned; the ultrasonic power is 100-200W, and the ultrasonic time is 10-20min; after treatment, the copper mesh is placed in an oven for drying to obtain a clean copper mesh; first, place a porcelain boat in a muffle furnace, and place the clean copper mesh on the porcelain boat for calcination. The muffle furnace calcination temperature is set to 500℃, the calcination time is 3h, and the muffle furnace heating rate is 10℃ / min to obtain a black copper oxide mesh array sample, i.e., a copper mesh with CuO nanoarray, wherein the SEM image of the CuO nanoarray is as shown below. Figure 2 As shown in b;

[0049] S2. Laser 3D printing was used to laser engrave the front and back surfaces of a copper mesh with a CuO nanoparticle array. The power of the laser engraver was set to 2.5W, the depth of the laser engraver was set to 5nm, and the laser engraving light source was blue light to obtain a copper mesh with a CuO-Vo nanoparticle array.

[0050] S3. The copper mesh with CuO-Vo nanoarray was immersed in silver nitrate solution, and then taken out after repeated immersion. It was then washed with distilled water three times and then dried at 60°C to obtain a copper mesh with AgNO3 / CuO-Vo nanoarray (the SEM image of which is shown in FIG. Figure 2 c), and then a laser engraving machine is used to laser engrave the front and back of the copper mesh with the AgNO3 / CuO-Vo nanoarray. The laser engraving power is 5W, the laser engraving depth is 2nm, and the laser engraving light source is blue light. The copper mesh with the Ag / CuO-Vo nanoarray is obtained, which is a silver-loaded copper oxide nanoarray photocatalytic antibacterial material.

[0051] The SEM diagram of each material in the process of preparing silver-loaded copper oxide nanoarray photocatalytic antibacterial material in this application is as follows Figure 2 As shown, specifically, Figure 2 a is the SEM diagram of the raw copper mesh at 10 μm, and it can be observed that the surface is relatively smooth; Figure 2 b is a SEM diagram of the in-situ growth of copper oxide nanoarrays (CuO nanoarrays) at 10 μm on a copper mesh substrate, showing a relatively uniform nanoarray growing on the surface; Figure 2 c is a SEM diagram of the in-situ growth of 1 μm AgNO3 / CuO-Vo nanoarrays using a copper mesh as a substrate using a laser 3D printing process. It can be seen from the figure that silver nitrate mainly exists in the form of nanosheets; Figure 2 d is a SEM diagram of the in-situ growth of 10 μm Ag / CuO-Vo nanoarrays using a copper mesh as a substrate using laser 3D printing technology; Figure 2 e is a SEM diagram of the in-situ growth of 1 μm Ag / CuO-Vo nanoarray using a laser 3D printing process on a copper mesh as a substrate, with Ag nanoparticles in the form of particles loaded on the surface; Figure 2 f is an EDS-Mapping schematic diagram of the in-situ growth of Ag / CuO-Vo nanoarray using a laser 3D printing process on a copper mesh as a substrate. It can be seen from the figure that it is mainly composed of three elements: Ag, Cu, and O, and is evenly distributed. Figure 3 Ag / CuO-V prepared by laser 3D printing process with copper mesh as substrate O Schematic diagram of XRD and EPR oxygen vacancies of nanoarrays; Figure 3 a is a schematic diagram of the XRD pattern of in-situ growth of copper oxide nanoarrays and Ag / CuO-Vo nanoarrays on a copper mesh substrate. The diffraction peaks show that Ag / CuO-Vo was successfully synthesized, but no Ag peak was detected in the figure, indicating that Ag did not reach the detection limit. Figure 3 b is a schematic diagram of the EPR oxygen vacancy characterization of Ag / CuO-Vo nanoarrays, Ag / CuO, CuO-Vo, and CuO grown in situ using a laser 3D printing process on a copper mesh as a substrate, indicating that the CuO-Vo prepared in this application is rich in oxygen vacancies, and the oxygen vacancies of the Ag / CuO-Vo nanoarray are further improved. After Ag loading, the lattice stress and lattice constant of the CuO nanoarray can be increased. After laser 3D printing, Ag can better combine with CuO, thereby promoting the increase in oxygen vacancy concentration.

[0052] Example 2-3

[0053] A silver-loaded copper oxide nanoarray photocatalytic antibacterial material, the other contents of which are the same as those of Example 1, except that the mesh sizes of the raw copper mesh are adjusted to 120 mesh and 180 mesh respectively.

[0054] Examples 4-5

[0055] A silver-loaded copper oxide nanoarray photocatalytic antibacterial material, the other contents are the same as those in Example 1, except that the concentrations of the silver nitrate solution are adjusted to 1 mg / mL and 0.5 mg / mL respectively.

[0056] Evaluation Test

[0057] The antibacterial properties of the silver-loaded copper oxide nanoarray photocatalytic antibacterial materials in Examples 1-5 were tested using CuO and Ag / CuO as comparisons:

[0058] Step 1: Cultivate E. coli bacteria in liquid culture medium.

[0059] Step 2: Place the Ag / CuO-Vo nanoarray agent grown in situ on the copper mesh into the cultured and diluted Escherichia coli reaction solution for reaction.

[0060] Step 3: Using copper mesh as the base and various catalysts as control samples, conduct E. coli experimental tests.

[0061] Step 4: After 10 minutes of reaction, samples were taken and the survival of E. coli was detected using the plate spreading method.

[0062] Wherein: Preparation of Ag / CuO: The CuO nanoarray was immersed in a 0.1 mg / mL silver nitrate solution for 3 minutes and calcined at 300° C. for 1 hour to obtain an Ag / CuO nanoarray catalyst.

[0063] like Figure 4 Shown is a schematic diagram of the performance evaluation of the catalyst in inactivating Escherichia coli. Figure 4 a is a schematic diagram of the survival of E. coli observed by the plate coating method with different catalysts; it can be observed from the figure that after 20 minutes of reaction, no E. coli grew on the plate after the reaction of the Ag / CuO-Vo catalyst, indicating that the sterilization efficiency reached 99.99%, which is better than that of other catalysts. Figure 4 b is a schematic diagram of the performance of inactivating E. coli after 10 minutes of reaction with different catalysts. The inactivation efficiency of Ag / CuO-Vo reached 1.16Log, and the sterilization efficiency reached 92%. Figure 4 c is the Ag / CuO-V O Schematic diagram of the performance of nanoarray catalyst in inactivating E. coli. It can be seen from the figure that the E. coli inactivation rate reached 99.99% after 20 minutes. Figure 4 d is Ag / CuO-V loaded with different concentrations of silver nitrate OSchematic diagram of the performance of the nanoarray catalyst in inactivating E. coli. When the silver nitrate loading is 0.1 mg / mL, the inactivation efficiency can reach 99.99%. As the silver nitrate content increases, the inactivation efficiency remains consistent. Figure 4 e is Ag / CuO-V with different mesh sizes O Schematic diagram of the performance of nanoarray catalyst inactivating E. coli. The denser the mesh, the better the sterilization effect. Table 1 shows the inactivation efficiency of E. coli under different catalysts at different times. It can be seen from Table 1 that at 20 minutes, Ag / CuO-V O The fire extinguishing rate is 99.99%, which is a better sterilization level than other catalysts.

[0064] Table 1 Inactivation efficiency of Escherichia coli with different catalysts at different times

[0065]

[0066] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A silver-loaded copper oxide nanoarray photocatalytic antibacterial material, characterized in that: The invention comprises a base copper mesh and an Ag / CuO-Vo nanoarray in-situ grown on the copper mesh; the Ag / CuO-Vo nanoarray comprises a CuO-Vo nanoarray and nanosilver in-situ loaded on the surface of the CuO-Vo nanoarray, and the CuO-Vo nanoarray is a CuO nanoarray with oxygen vacancies Vo; the mesh size of the copper mesh is 80-180.

2. A method for preparing the silver-supported copper oxide nanoarray photocatalytic antibacterial material according to claim 1, characterized in that: The following steps are involved: S1. calcining a clean copper mesh to obtain a copper mesh having a CuO nanoparticle array; S2. The copper mesh having the CuO nanoarray is laser engraved on both sides using a laser 3D printing process to obtain a copper mesh having a CuO-Vo nanoarray; S3. After soaking the copper mesh with the CuO-Vo nanoarray in a silver nitrate solution, taking it out, washing it, and drying it to obtain a copper mesh with an AgNO3 / CuO-Vo nanoarray. Then, using a laser 3D printing process, the copper mesh with the AgNO3 / CuO-Vo nanoarray is laser engraved on both sides to obtain a copper mesh with an Ag / CuO-Vo nanoarray, which is the silver-loaded copper oxide nanoarray photocatalytic antibacterial material. The power of the laser 3D printing is 1-5W, and the depth of the laser 3D printing is 2-5nm. The light source of the laser 3D printing is one or more of blue light, infrared light, and ultraviolet light.

3. The preparation method according to claim 2, characterized in that The calcination temperature is 500-600° C., the calcination heating rate is 10-15° C. / min, and the calcination time is 3-5 hours.

4. The preparation method according to claim 2, characterized in that The concentration of the silver nitrate solution is 0.1-1 mg / ml.

5. Use of the silver-loaded copper oxide nanoarray photocatalytic antibacterial material according to claim 1 in water pollution control.

6. The use according to claim 5, characterized in that The silver-loaded copper oxide nano-array photocatalytic antibacterial material performs catalytic sterilization under visible light irradiation.

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