Copper-zinc composite antibacterial agent for purifying water and air and preparation method thereof

Abstract

The application provides a copper-zinc composite antibacterial agent for purifying water and air and a preparation method thereof, and relates to the technical field of purification. The copper-zinc composite antibacterial agent for purifying water and air comprises the following components: an antibacterial agent carrier, a copper oxide precursor, a zinc oxide precursor and an organic solvent, and the mass ratio of the copper oxide precursor, the zinc oxide precursor and the antibacterial agent carrier is 1.18-2.36:0.92-1.84:10. The copper-zinc composite antibacterial agent is obtained through in-situ sintering technology after pre-dispersing treatment of the copper-zinc oxide precursor and the antibacterial agent carrier by a mechanical physical method, and has the advantages of high antibacterial component loading, uniform particle size, uniform dispersion, high bonding strength and the like, and meanwhile, the copper ion and zinc ion precipitation amount is low, and the copper-zinc composite antibacterial agent is safe and harmless. Through testing, the copper-zinc composite antibacterial agent shows excellent and efficient antibacterial performance, and the material can be applied to water purification and air purification filter core materials as an antibacterial additive to endow the filter material with excellent antibacterial performance.

Description

Technical Field

[0001] This invention relates to the field of purification technology, and in particular to a copper-zinc composite antibacterial agent for water and air purification and its preparation method. Background Technology

[0002] With technological advancements and social development, people have increasingly higher demands for drinking water safety and air quality. Water purification and air purification are crucial for maintaining human health, preventing the spread of disease, and ensuring environmental hygiene and safety. Currently, water purifier cartridges, including those used for medical wastewater, industrial wastewater, and drinking water purification, are made of ceramic, activated carbon, or polymer materials. However, over time, these cartridges are easily clogged by contaminants, leading to reduced water flow and decreased water quality. Furthermore, prolonged contact with water sources and the resulting humid environment easily breeds harmful microorganisms such as bacteria, viruses, and mold, causing discoloration, mold growth, and excessive levels of microorganisms and oxygen consumption in the effluent, threatening users' drinking water safety.

[0003] In the field of air purification, airborne transmission, especially in high-density urban residential and office environments, provides a breeding ground for the rapid spread of infectious diseases. Effective air purification systems can block the transmission routes of harmful microorganisms, thereby protecting vulnerable populations. However, current air purification filter technology primarily targets pollutants such as harmful gases, odors, and dust, with limited effectiveness in adsorbing and filtering harmful microorganisms such as bacteria and viruses.

[0004] Currently, silver ion antibacterial agents are commonly used in the water and air purification filter industry to remove harmful microorganisms. However, the production and use of silver ion antibacterial agents are expensive. Furthermore, their leaching bactericidal mechanism leads to the accumulation of released silver ions in the human body, which, through endocytosis and diffusion, pose potential hazards to human health and safety. Copper-based antibacterial agents (such as copper oxide and cuprous oxide) and zinc-based antibacterial agents (zinc oxide) are increasingly being used in the antibacterial market due to their low cost, safety, non-toxicity, broad-spectrum antibacterial and antifungal properties, and virus inactivation capabilities. In particular, copper oxide and cuprous oxide have been reported to have highly effective virus inactivation. In addition, copper oxide, cuprous oxide, and zinc oxide also have the function of adsorbing and catalytically decomposing organic pollutants, showing broad prospects in water purification and air purification fields such as medical wastewater and sewage treatment.

[0005] Therefore, it is necessary to provide a new copper-zinc composite antibacterial agent for water purification and air purification, and its preparation method, to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a copper-zinc composite antibacterial agent for water purification and air purification, characterized by high antibacterial component loading rate, uniform dispersion, strong binding force, high safety, and no biotoxicity, as well as its preparation method.

[0007] The copper-zinc composite antibacterial agent for water and air purification provided by this invention comprises the following components: The mixture comprises an antibacterial agent carrier, a copper oxide precursor, a zinc oxide precursor, and an organic solvent, wherein the mass ratio of the copper oxide precursor, the zinc oxide precursor, and the antibacterial agent carrier is 1.18-2.36:0.92-1.84:10, and the organic solvent is 2-5 times the mass of the antibacterial agent carrier.

[0008] Preferably, the antibacterial agent carrier is one or a mixture of diatomaceous earth, mesoporous silica, vermiculite, zeolite, titanium dioxide, talc, and activated alumina; the copper oxide precursor is one or a mixture of copper oxalate, copper formate, copper lactate, copper 8-hydroxyquinoline salt, copper oleate, copper tartrate, basic copper carbonate, and copper acetate; the zinc oxide precursor is one or a mixture of zinc propionate, zinc acetate, zinc 4-benzoate, zinc acetylacetonate, zinc hydroxide, and zinc 3-methylbenzoate; and the organic solvent is one of n-hexane, acetone, anhydrous ethanol, isopropanol, and ethyl acetate.

[0009] Preferably, the particle size of the copper oxide precursor is 200 nm-5 μm; the particle size of the zinc oxide precursor is 200 nm-5 μm.

[0010] A method for preparing a copper-zinc composite antibacterial agent for water and air purification includes the following steps: S1. The antibacterial agent carrier is placed in a crystallization dish and washed with deionized water, anhydrous ethanol and acetone by ultrasonic vibration and / or mechanical stirring and / or magnetic stirring to remove impurities and potential heavy metal ions. After washing, it is vacuum filtered and then dried in a forced-air drying oven. Finally, it is sieved through a stainless steel screen to obtain a dry, dispersed, high-purity antibacterial agent carrier with uniform particle size. S2, copper oxide precursor, zinc oxide precursor, pretreated antibacterial agent carrier and organic solvent are thoroughly mixed by mechanical stirring and / or magnetic stirring, the solvent is removed by vacuum filtration, and dried in a forced-air drying oven to obtain a uniformly dispersed mixture precursor; S3, a quartz boat carrying 5g of the mixed precursor is placed in a sintering furnace and solid-phase sintering is carried out under certain conditions. After the furnace body is cooled to room temperature, the copper-zinc composite antibacterial agent is obtained.

[0011] Preferably, in step S1, the ultrasonic oscillation time is 20-40 min; the mechanical stirring time is 30 min-2 h with a stirring rate of 200-500 rpm; and the magnetic stirring time is 1-2 h with a stirring rate of 400-800 rpm.

[0012] Preferably, the drying temperature in step S1 is 70°C and the drying time is 6 hours; the stainless steel screen mesh sizes are 50-100 mesh and 325-400 mesh.

[0013] Preferably, in step S2, the mechanical stirring speed is set to 250 rpm and the stirring time is 12 hours; the magnetic stirring speed is set to 400 rpm and the stirring time is 12 hours. The drying temperature is 70°C and the drying time is 6 hours.

[0014] Preferably, the solid-state sintering step in S3 is as follows: after placing the quartz boat carrying the mixed precursor in the isothermal zone of the furnace, vacuum evacuation is performed. When the gas pressure inside the tube is lower than 0.1 mbar, argon gas is introduced and restored to atmospheric pressure. Then, the heating program is started, wherein the heating rate is set to 8-12 min / ℃; the sintering temperature is set to 300-600℃; the holding time is set to 30 min-2 h depending on the different mixed precursors and processes; after the temperature inside the tube reaches 100℃, oxygen is introduced, and the gas flow rates of oxygen and argon are set to 50-200 mbar and 200-500 mbar, respectively.

[0015] Compared with related technologies, the copper-zinc composite antibacterial agent for water purification and air purification and its preparation method provided by the present invention have the following beneficial effects: This invention provides a method for preparing a copper-zinc composite antibacterial agent for water purification and air purification. After dispersing a copper-zinc mixture precursor and an antibacterial agent carrier by mechanical and physical action, copper-zinc oxide particles are grown in situ on the surface of the antibacterial agent carrier by solid-phase sintering under different partial pressures and atmospheres. This method has the advantages of uniform particle size, uniform dispersion, and high loading of antibacterial components. At the same time, the amount of copper and zinc ions released is low, making it safe and harmless. This invention provides a copper-zinc composite antibacterial agent for water and air purification, in which copper oxide and zinc oxide maintain a strong bonding force with the activated carbon carrier interface; at the same time, it is easy to use and has good processability. As an antibacterial adjuvant, it can be directly added in proportion to prepare various water and air purification filter materials, giving them resistance to harmful microorganisms. Attached Figure Description

[0016] Figure 1 The images of "ad" in the examples are sample images of the copper-zinc composite antibacterial agents prepared in Examples 1-4, respectively. Figure 2 The image shows a scanning electron microscope (SEM) image of the cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material prepared in Example 1.

[0017] Figure 3 The image shows the energy dispersive spectroscopy (EDS) elemental distribution of the cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material prepared in Example 1.

[0018] Figure 4 The graph shows the release concentrations of copper and zinc ions over 7 consecutive days for the cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material prepared in Example 1. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1 A copper-zinc composite antibacterial agent for water and air purification includes the following components in its raw materials: antibacterial agent carrier, copper oxide precursor, zinc oxide precursor, and organic solvent. The mass ratio of the copper oxide precursor, zinc oxide precursor, and antibacterial agent carrier is 1.18-2.36:0.92-1.84:10, and the organic solvent is 2-5 times the mass of the antibacterial agent carrier.

[0021] The antibacterial agent carrier is diatomaceous earth; the copper oxide precursor is copper oxalate; the zinc oxide precursor is zinc propionate; and the organic solvent is anhydrous ethanol.

[0022] A method for preparing a copper-zinc composite antibacterial agent for water and air purification includes the following steps: S1. Place 25g of diatomaceous earth powder in a crystallizing dish and wash it with deionized water, anhydrous ethanol and acetone by ultrasonic vibration, mechanical stirring and magnetic stirring respectively to remove impurities and potential heavy metal ions. After washing, it is vacuum filtered and then dried in a forced-air drying oven. Finally, it is sieved through a stainless steel sieve to obtain dry, dispersed, high-purity diatomaceous earth powder with uniform particle size. S2, weigh 2.36g of copper oxalate, 1.84g of zinc propionate and 10g of pretreated diatomaceous earth powder into a crystallizing dish, add 50mL of anhydrous ethanol, mix thoroughly by mechanical stirring and magnetic stirring respectively, remove ethanol solvent by vacuum filtration, and dry in a forced-air drying oven at 70℃ for 6h to obtain a uniformly dispersed mixture precursor; S3, a quartz boat carrying 5g of the mixed precursor is placed in the isothermal zone of the quartz tube in a chemical vapor deposition furnace for solid-phase sintering. After the furnace body is cooled to room temperature, a cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material is obtained.

[0023] In S1, the ultrasonic oscillation time is 30 min; the mechanical stirring time is 2 h, and the stirring rate is 500 rpm; the magnetic stirring time is 1 h, and the stirring rate is 500 rpm; the drying temperature in S1 is 70℃, and the drying time is 6 h; the stainless steel screen mesh numbers are 50 mesh and 400 mesh, respectively.

[0024] In S2, the particle size of both copper oxalate and acrylic acid is approximately 500 nm; the mechanical stirring speed is set to 250 rpm and the stirring time is 12 h; the magnetic stirring speed is set to 400 rpm and the stirring time is 12 h.

[0025] In step S3, the solid-state sintering process is as follows: A quartz boat carrying the mixed precursor is placed in the isothermal zone of the furnace and then evacuated under vacuum. When the pressure inside the tube drops below 0.1 mbar, argon gas is introduced and the pressure is restored to atmospheric pressure. Then, a heating program is started, with a heating rate set at 10 min / ℃; a sintering temperature set at 500℃; and a holding time set at 2 h. After the temperature inside the tube reaches 100℃, oxygen is introduced, with the oxygen and argon gas flow rates set at 50 mbar and 400 mbar, respectively.

[0026] Example 2 A copper-zinc composite antibacterial agent for water and air purification includes the following components in its raw materials: antibacterial agent carrier, copper oxide precursor, zinc oxide precursor, and organic solvent. The mass ratio of the copper oxide precursor, zinc oxide precursor, and antibacterial agent carrier is 1.18-2.36:0.92-1.84:10, and the organic solvent is 2-5 times the mass of the antibacterial agent carrier.

[0027] The antibacterial agent carrier is mesoporous silica; the copper oxide precursor is copper formate; the zinc oxide precursor is zinc propionate; and the organic solvent is acetone.

[0028] A method for preparing a copper-zinc composite antibacterial agent for water and air purification includes the following steps: S1. 25g of mesoporous silica powder was placed in a crystallizing dish and washed with deionized water, anhydrous ethanol and acetone by ultrasonic vibration and magnetic stirring to remove impurities and potential heavy metal ions. After washing, it was vacuum filtered and then dried in a forced-air drying oven. Finally, it was sieved through a stainless steel sieve to obtain dry, dispersed, high-purity and uniform-sized mesoporous silica powder. S2, weigh 2.36g copper formate, 1.84g zinc acetate and 10g pretreated mesoporous silica into a crystallizing dish, add 50mL acetone, mix thoroughly by mechanical stirring and magnetic stirring respectively, remove solvent by vacuum filtration, dry in a forced-air drying oven at 70℃ for 6h to obtain a uniformly dispersed mixture precursor; S3, a quartz boat carrying 5g of the mixed precursor is placed in the isothermal zone of the quartz tube in a chemical vapor deposition furnace for solid-state sintering. After the furnace body is cooled to room temperature, a cuprous oxide-zinc oxide-mesoporous silica composite antibacterial agent material is obtained.

[0029] In S1, the ultrasonic oscillation time is 20 min; the mechanical stirring time is 1 h, and the stirring speed is 500 rpm; the magnetic stirring time is 1 h, and the stirring speed is 500 rpm; the drying temperature in S1 is 70℃, and the drying time is 6 h; the stainless steel screen mesh numbers are 325 mesh and 400 mesh, respectively.

[0030] In S2, the particle size of both copper formate and zinc acetate is approximately 400nm-500nm; the mechanical stirring speed is set to 250rpm for 12 hours; the magnetic stirring speed is set to 400rpm for 12 hours. In step S3, the solid-state sintering process is as follows: A quartz boat carrying the mixed precursor is placed in the isothermal zone of the furnace and then evacuated under vacuum. When the pressure inside the tube drops below 0.1 mbar, argon gas is introduced and the pressure is restored to atmospheric pressure. Then, a heating program is started, with a heating rate set at 10 min / ℃; a sintering temperature set at 550℃; and a holding time set at 2 h. After the temperature inside the tube reaches 100℃, oxygen is introduced, with the oxygen and argon gas flow rates set at 50 mbar and 500 mbar, respectively.

[0031] Example 3 A copper-zinc composite antibacterial agent for water and air purification includes the following components in its raw materials: antibacterial agent carrier, copper oxide precursor, zinc oxide precursor, and organic solvent. The mass ratio of the copper oxide precursor, zinc oxide precursor, and antibacterial agent carrier is 1.18-2.36:0.92-1.84:10, and the organic solvent is 2-5 times the mass of the antibacterial agent carrier.

[0032] The antibacterial agent carrier is zeolite; the copper oxide precursor is 8-hydroxyquinoline copper salt; the zinc oxide precursor is 4-zinc benzoate salt; and the organic solvent is isopropanol.

[0033] A method for preparing a copper-zinc composite antibacterial agent for water and air purification includes the following steps: S1. Place 25g of zeolite powder in a crystallizing dish and wash it with deionized water, anhydrous ethanol and acetone by ultrasonic vibration and magnetic stirring to remove impurities and potential heavy metal ions. After washing, the powder is vacuum filtered and then dried in a forced-air drying oven. Finally, the powder is sieved through a stainless steel sieve to obtain dry, dispersed, high-purity zeolite powder with uniform particle size. S2, weigh 2.36 g of 8-hydroxyquinoline copper salt, 1.84 g of 4-(1,1-dimethylethyl)benzoate zinc salt and 10 g of pretreated zeolite powder and place them in a crystallizing dish, add 50 mL of isopropanol, mix thoroughly by mechanical stirring and magnetic stirring respectively, remove the solvent by vacuum filtration, and dry in a forced-air drying oven at 70 °C for 6 h to obtain a uniformly dispersed mixture precursor.

[0034] S3, a quartz boat carrying 5g of the mixed precursor is placed in the isothermal zone of a chemical vapor deposition furnace quartz tube for solid-state sintering. After the furnace body is cooled to room temperature, a cuprous oxide-copper oxide-zinc oxide-zeolite composite antibacterial agent material is obtained. In S1, the ultrasonic oscillation time is 20 min; the mechanical stirring time is 1 h, and the stirring speed is 500 rpm; the magnetic stirring time is 1 h, and the stirring speed is 500 rpm; the drying temperature in S1 is 70℃, and the drying time is 6 h; the stainless steel screen mesh numbers are 325 mesh and 400 mesh respectively. In S2, the particle size of both the 8-hydroxyquinoline copper salt and the 4-(1,1-dimethylethyl)benzoate zinc salt is 200nm-500nm; the mechanical stirring speed is set to 300rpm and the stirring time is 12h; the magnetic stirring speed is set to 500rpm and the stirring time is 12h. In step S3, the solid-state sintering process is as follows: A quartz boat carrying the mixed precursor is placed in the isothermal zone of the furnace and then evacuated under vacuum. When the pressure inside the tube drops below 0.1 mbar, argon gas is introduced and the pressure is restored to atmospheric pressure. Then, a heating program is started, with a heating rate set at 10 min / ℃; a sintering temperature set at 500℃; and a holding time set at 2 h. After the temperature inside the tube reaches 100℃, oxygen is introduced, with the oxygen and argon gas flow rates set at 50 mbar and 400 mbar, respectively.

[0035] Example 4 A copper-zinc composite antibacterial agent for water and air purification includes the following components in its raw materials: antibacterial agent carrier, copper oxide precursor, zinc oxide precursor, and organic solvent. The mass ratio of the copper oxide precursor, zinc oxide precursor, and antibacterial agent carrier is 1.18-2.36:0.92-1.84:10, and the organic solvent is 2-5 times the mass of the antibacterial agent carrier.

[0036] The antibacterial agent carrier is vermiculite; the copper oxide precursor is copper tartrate; the zinc oxide precursor is zinc acetylacetonate; and the organic solvent is ethyl acetate.

[0037] A method for preparing a copper-zinc composite antibacterial agent for water and air purification includes the following steps: S1. Place 25g of vermiculite powder in a crystallizing dish and wash it with deionized water, anhydrous ethanol and acetone by ultrasonic vibration and magnetic stirring to remove impurities and potential heavy metal ions. After washing, it is vacuum filtered and then dried in a forced-air drying oven. Finally, it is sieved through a stainless steel sieve to obtain dry, dispersed vermiculite powder with high purity and uniform particle size.

[0038] S2, weigh 2.36g of copper tartrate, 1.84g of zinc acetylacetonate and 10g of pretreated vermiculite powder into a crystallizing dish, add 50mL of ethyl acetate, mix thoroughly by mechanical stirring and magnetic stirring respectively, remove the solvent by vacuum filtration, and dry in a forced-air drying oven at 70℃ for 6h to obtain a uniformly dispersed mixture precursor; S3, a quartz boat carrying 5g of the mixed precursor is placed in the isothermal zone of the quartz tube in a chemical vapor deposition furnace for solid-phase sintering. After the furnace body is cooled to room temperature, a cuprous oxide-copper oxide-zinc oxide-vermiculite composite antibacterial agent material is obtained.

[0039] In S1, the ultrasonic oscillation time is 20 min; the mechanical stirring time is 1 h, and the stirring rate is 500 rpm; the magnetic stirring time is 1 h, and the stirring rate is 500 rpm; the drying temperature in S1 is 70℃, and the drying time is 6 h; the stainless steel screen mesh numbers are 100 mesh and 325 mesh, respectively.

[0040] In S2, the particle size of both copper tartrate and zinc acetylacetonate is approximately 500 nm; the mechanical stirring speed is set to 300 rpm and the stirring time is 12 h; the magnetic stirring speed is set to 500 rpm and the stirring time is 12 h.

[0041] In step S3, the solid-state sintering process is as follows: A quartz boat carrying the mixed precursor is placed in the isothermal zone of the furnace and then evacuated under vacuum. When the pressure inside the tube drops below 0.1 mbar, argon gas is introduced and the pressure is restored to atmospheric pressure. Then, a heating program is started, with a heating rate set at 10 min / ℃; a sintering temperature set at 500℃; and a holding time set at 2 h. After the temperature inside the tube reaches 100℃, oxygen is introduced, with the oxygen and argon gas flow rates set at 50 mbar and 400 mbar, respectively.

[0042] Example 5 Example 5 is the control group of Example 1. The steps are basically the same as those of Example 1, except that in step 2, the copper oxide precursor and zinc oxide precursor are changed to copper lactate and zinc 3-methylbenzoate, respectively. The other steps remain unchanged. Finally, in step 3, cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material is obtained.

[0043] Example 6 Example 6 is the control group of Example 1. The steps are basically the same as those of Example 1, except that in step 2, the copper oxide precursor is changed to basic copper carbonate. The other steps remain unchanged. Finally, in step 3, cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material is obtained.

[0044] Example 7 Example 7 is the control group of Example 1. The steps are basically the same as those of Example 1, except that in step 3, the sintering temperature is adjusted to 600℃ and the holding time is 1.5h. Other steps remain unchanged, and finally, a cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material is obtained.

[0045] Example 8 Example 8 is the control group of Example 1. The steps are basically the same as those of Example 1, except that in step 3, the sintering temperature is adjusted to 450℃, and the oxygen and argon gas flow rates are adjusted to 150mbar and 300mbar respectively. Other steps remain unchanged. Finally, in step 3, cuprous oxide-zinc oxide-diatomite composite antibacterial agent material is obtained.

[0046] Material characterization and performance testing analysis The morphology and elemental distribution of the cuprous oxide-copper oxide-zinc oxide-diatomite composite antibacterial agent material prepared in Example 1 were analyzed. Figure 2 The image shows energy dispersive spectroscopy (EDS) images of the material at different magnifications. The images reveal that the diatomaceous earth support surface and micropores are filled with uniformly sized particles, exhibiting high loading and good dispersion. Elemental analysis using surface scanning electron microscopy (ESM) further confirms the presence of these particles. Figure 3 The particles are cuprous oxide, copper oxide, and zinc oxide particles. As can be seen from the figure, copper and zinc elements are distributed very evenly on the surface of the diatomaceous earth carrier, which further illustrates that the preparation method described in this invention can uniformly disperse copper oxide and zinc oxide, greatly improving the composite material's resistance to harmful microorganisms and its water and air purification performance.

[0047] The release levels of copper and zinc elements in water purification materials are crucial to users' drinking water safety. According to the "Evaluation Standard for Hygienic Safety of Drinking Water Transmission and Distribution Equipment and Protective Equipment" (2001), this application conducted a safety test on the cuprous oxide-copper oxide-zinc oxide-diatomaceous earth composite antibacterial agent material prepared in Example 1. While the original standard tested the element concentration in the soaking water over 24 hours, this patent tested the copper and zinc ion concentrations of the sample prepared in Example 1 for 7 consecutive days (168 hours), which is equivalent to implementing a more stringent safety testing standard. Figure 4 As shown, the concentrations of copper and zinc ions remained below 0.2 ppm after immersion in water for 7 days, indicating a high safety factor.

[0048] Under the premise of complying with the "Evaluation Standard for Sanitary Safety of Drinking Water Transmission and Distribution Equipment and Protective Equipment" (2001), the antibacterial agent material prepared in Example 1 was subjected to antibacterial tests. As shown in Table 1, the test samples prepared in Example 1 achieved a bactericidal rate of over 99.99% against Escherichia coli and Staphylococcus aureus, demonstrating excellent and efficient bactericidal performance.

[0049]

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing a copper-zinc composite antibacterial agent for water purification and air purification, characterized in that, Includes the following steps: S1. The antibacterial agent carrier is placed in a crystallization dish and washed with deionized water, anhydrous ethanol and acetone by ultrasonic vibration and / or mechanical stirring and / or magnetic stirring to remove impurities and potential heavy metal ions. After washing, it is vacuum filtered and then dried in a forced-air drying oven. Finally, it is sieved through a stainless steel screen to obtain a dry, dispersed, high-purity antibacterial agent carrier with uniform particle size. S2, copper oxide precursor, zinc oxide precursor, pretreated antibacterial agent carrier and organic solvent are thoroughly mixed by mechanical stirring and / or magnetic stirring, the solvent is removed by vacuum filtration, and dried in a forced-air drying oven to obtain a uniformly dispersed mixture precursor; S3. A quartz boat carrying 5g of the mixed precursor is placed in a sintering furnace for solid-state sintering. The specific steps are as follows: After placing the quartz boat carrying the mixed precursor in the isothermal zone of the furnace, vacuum evacuation is performed. When the gas pressure inside the tube is lower than 0.1mbar, argon gas is introduced and restored to atmospheric pressure. Then, the heating program is started, with the heating rate set to 8-12℃ / min; the sintering temperature set to 300-600℃; and the holding time set to 30min-2h depending on the different mixed precursors and processes. After the temperature inside the tube reaches 100℃, oxygen is introduced, and the partial pressures of oxygen and argon are set to 50-200mbar and 200-500mbar, respectively. After the furnace body is cooled to room temperature, the copper-zinc composite antibacterial agent is obtained. The mass ratio of the copper oxide precursor, zinc oxide precursor, and antibacterial agent carrier is 1.18-2.36:0.92-1.84:10, respectively. The organic solvent is 2-5 times the mass of the antibacterial agent carrier. The antibacterial agent carrier is one or a mixture of diatomaceous earth, mesoporous silica, vermiculite, zeolite, titanium dioxide, talc, and activated alumina. The copper oxide precursor is one or a mixture of copper oxalate, copper formate, copper lactate, 8-hydroxyquinoline copper salt, copper oleate, copper tartrate, basic copper carbonate, and copper acetate. The zinc oxide precursor is one or a mixture of zinc propionate, zinc acetate, zinc 4-benzoate, zinc acetylacetonate, zinc hydroxide, and zinc 3-methylbenzoate. The organic solvent is one of n-hexane, acetone, anhydrous ethanol, isopropanol, and ethyl acetate.

2. The method for preparing a copper-zinc composite antibacterial agent for water and air purification according to claim 1, characterized in that, The copper oxide precursor has a particle size of 200 nm to 5 μm; the zinc oxide precursor has a particle size of 200 nm to 5 μm.

3. The method for preparing a copper-zinc composite antibacterial agent for water purification and air purification according to claim 1, characterized in that, In S1, the ultrasonic oscillation time is 20-40 min; the mechanical stirring time is 30 min-2 h with a stirring rate of 200-500 rpm; and the magnetic stirring time is 1-2 h with a stirring rate of 400-800 rpm.

4. The method for preparing a copper-zinc composite antibacterial agent for water purification and air purification according to claim 3, characterized in that, The drying temperature in S1 is 70℃, and the drying time is 6h; the stainless steel screen mesh sizes are 50-100 mesh and 325-400 mesh.

5. The method for preparing a copper-zinc composite antibacterial agent for water purification and air purification according to claim 3, characterized in that, In S2, the mechanical stirring speed is set to 250 rpm and the stirring time is 12 h; the magnetic stirring speed is set to 400 rpm and the stirring time is 12 h; the drying temperature is 70℃ and the drying time is 6 h.

6. The copper-zinc composite antibacterial agent prepared by the method for preparing the copper-zinc composite antibacterial agent for water purification and air purification according to any one of claims 1-5.

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