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CN-122006344-A - Nano catalytic antibacterial filter material for direct drinking machine and preparation method thereof

CN122006344ACN 122006344 ACN122006344 ACN 122006344ACN-122006344-A

Abstract

The invention relates to the technical field of water treatment materials, and discloses a nano catalytic antibacterial filter material for a direct drinking machine, which comprises, by mass, 8-20% of a broad-spectrum nano antibacterial component, 55-85% of a base material, 4-10% of a binder, 2-5% of a dispersing agent and 2-6% of an auxiliary agent, wherein the broad-spectrum nano antibacterial component is Ag-TiO2/ZnO-CuO quaternary composite nano particles, and the mass ratio of Ag, tiO2, znO and CuO is 1:2-4:1-3:0.5-1.5. The nano catalytic antibacterial filter material and the preparation method thereof have inhibition and killing rates of more than or equal to 99.9% on gram negative bacteria (escherichia coli, pseudomonas aeruginosa and klebsiella pneumoniae), gram positive bacteria (staphylococcus aureus, bacillus subtilis and methicillin-resistant staphylococcus aureus) and fungi (candida albicans and aspergillus niger).

Inventors

  • DU YANDAN
  • DONG SHUWEI
  • ZHANG JIANPING
  • DU YANMEI
  • ZHANG JUTAO

Assignees

  • 陕西中赐丹实业有限公司

Dates

Publication Date
20260512
Application Date
20260122

Claims (10)

  1. 1. A nano catalytic antibacterial filter material for a direct drinking machine is characterized by comprising, by weight, 55-85% of a base material, 8-20% of a broad-spectrum nano antibacterial component, 4-10% of a binder, 2-5% of a dispersing agent and 2-6% of an auxiliary agent; The broad-spectrum nano antibacterial component is Ag-TiO 2 /ZnO-CuO quaternary composite nano particles, wherein the mass ratio of Ag to TiO 2 to ZnO to CuO is 1:2-4:1-3:0.5-1.5.
  2. 2. The nano catalytic antibacterial filter material for the direct drinking machine and the preparation method thereof according to claim 1, wherein the base material is one or more of modified columnar activated carbon, porous ceramic and molecular sieve; the modified columnar activated carbon is subjected to reflux treatment for 2-3 hours at 80 ℃ by 10-15% nitric acid solution, and the specific surface area is more than or equal to 1000m <2 >/g.
  3. 3. The nano-catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the binder is one or two selected from gamma-aminopropyl triethoxysilane (KH 550) and aqueous polyurethane, and the two are compounded according to a ratio of 1:1.
  4. 4. The nano-catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the dispersing agent is selected from one of polyvinylpyrrolidone (PVP) and trisodium citrate.
  5. 5. The nano-catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the auxiliary agent is selected from one of nano-hydroxyapatite and attapulgite.
  6. 6. The nano catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the antibacterial rate of the filter material on escherichia coli, staphylococcus aureus, pseudomonas aeruginosa, klebsiella pneumoniae and candida albicans is more than or equal to 99.9%.
  7. 7. The nano catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the shedding rate of the antibacterial component is less than or equal to 0.05%, and the antibacterial rate of the antibacterial component on mixed flora is still more than or equal to 99.5% after 18 months of continuous use.
  8. 8. The nano catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the total leaching amount of heavy metals of Ag, zn and Cu is less than or equal to 0.0005mg/L, and the removal rate of phenol in water is more than or equal to 90%.
  9. 9. The method for preparing the nano catalytic antibacterial filter material for the direct drinking machine according to claim 1, comprising the following steps: S1, preprocessing a base material, namely drying the base material after the base material is processed, wherein the modified columnar activated carbon is required to be subjected to nitric acid oxidation treatment, and the porous ceramic is required to be subjected to hydrofluoric acid treatment; S2, preparing a broad-spectrum nano antibacterial component, namely dispersing TiO 2 in water, adding silver nitrate, zinc nitrate and copper nitrate solution, adjusting the pH value to 7.5-8.5,50-80 ℃ for reaction for 3-4 hours, drying and calcining at 500-600 ℃ for 2-3 hours; s3, carrying out load treatment, namely mixing and pulping a base material, a nano antibacterial component, a binder, a dispersing agent and an auxiliary agent, performing ultrasonic dispersion for 90 minutes, and performing vacuum impregnation-lifting for 3-4 times at a lifting speed of 3-8mm/S; S4, solidifying and forming, namely pre-baking for 2-3 hours at 90-110 ℃, sintering for 3-4 hours at 400-500 ℃ under the protection of nitrogen, and cooling to obtain a finished product.
  10. 10. The method for preparing the nano catalytic antibacterial filter material for the direct drinking machine according to claim 1, wherein the ultrasonic dispersion power in the step 2 is 300W, the ultrasonic dispersion power in the step 3 is 500W, and the vacuum degree of vacuum impregnation is-0.08 MPa.

Description

Nano catalytic antibacterial filter material for direct drinking machine and preparation method thereof Technical Field The invention relates to the technical field of water treatment materials, in particular to a nano catalytic antibacterial filter material for a direct water dispenser and a preparation method thereof. Background The direct drinking machine is used as terminal drinking water purifying equipment, and the antibacterial performance of the core filter material directly relates to the sanitation and safety of the discharged water. With the rise of public health consciousness, pathogenic bacteria (such as escherichia coli, staphylococcus aureus, pseudomonas aeruginosa, klebsiella pneumoniae, candida albicans, methicillin-resistant staphylococcus aureus, aspergillus niger and the like) possibly existing in drinking water have become a focus, however, the existing filter materials of the direct drinking water machine have remarkable limitation on antibacterial performance, and are mainly characterized in the following aspects: 1. The antibacterial spectrum is narrow, the pertinence is single, the existing filter material is mostly dependent on a single antibacterial component (such as silver ions, zinc oxide, quaternary ammonium salt and the like), the filter material has obvious selectivity on the inhibition of pathogenic bacteria, for example, the silver ions have a good inhibition effect on gram-negative bacteria (such as escherichia coli), but the antibacterial rate on gram-positive bacteria (such as staphylococcus aureus) is usually only 85% -90%, the zinc oxide is effective on part of bacteria, but the inhibition rate on fungi (such as candida albicans) is less than 70%, the traditional activated carbon adsorption filter material can only realize the physical interception of bacteria, can not kill the bacteria, and is easy to cause hidden trouble of secondary pollution due to bacterial breeding temperature beds in the filter material. 2. The complex flora inhibition capability is weak, pathogenic bacteria in an actual drinking water environment often exist in a mixed flora form (such as escherichia coli, pseudomonas aeruginosa and klebsiella pneumoniae are contained simultaneously), and the existing filter material is difficult to inhibit a plurality of different types of pathogenic bacteria simultaneously and efficiently due to a single antibacterial mechanism. Research shows that the total antibacterial rate of the traditional silver-loaded filter material after 3 months is reduced to below 60% on mixed flora, and secondary pollution risk exists; 3. The antibacterial durability contradicts with the broad spectrum, namely, part of the improved filter material tries to widen the antibacterial spectrum by increasing the dosage of the antibacterial agent, but leads to easy shedding of antibacterial components (shedding rate is more than 5 percent), shortens the service life (usually less than 3 months), possibly causes heavy metal leaching (such as silver ion leaching amount is more than 0.01 mg/L), and obviously violates the mandatory requirement of GB5749-2022 sanitary Standard for Drinking Water. 4. The lack of a synergistic antibacterial design in the prior art does not fully utilize the synergistic effect of different antibacterial components, for example, the rapid sterilization of metal ions and the long-acting catalytic antibacterial effect of semiconductor nano materials are not complemented, so that the inhibition effect on intractable pathogenic bacteria (such as methicillin-resistant staphylococcus aureus) is very little, and the safety guarantee requirements of complex drinking water scenes such as campuses, offices and the like are difficult to meet. Therefore, the nano catalytic filter material which can simultaneously and efficiently inhibit various pathogenic bacteria such as gram-positive bacteria, gram-negative bacteria, fungi and the like, has wide antibacterial spectrum, strong durability and no secondary pollution is developed, becomes a key for solving the drinking safety problem of the direct drinking machine, and has important industrial value and civil significance. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a nano catalytic antibacterial filter material for a direct water dispenser and a preparation method thereof, which solve the problems. (II) technical scheme The invention provides a nano catalytic antibacterial filter material for a direct drinking machine, which comprises, by weight, 55-85% of a base material, 8-20% of a broad-spectrum nano antibacterial component, 4-10% of a binder, 2-5% of a dispersing agent and 2-6% of an auxiliary agent; The broad-spectrum nano antibacterial component is Ag-TiO 2/ZnO-CuO quaternary composite nano particles, wherein the mass ratio of Ag to TiO 2 to ZnO to CuO is 1:2-4:1-3:0.5-1.5. Preferably, the substrate is selected from one or more of modified