258 results about "Bacterial virus" patented technology

The invention provides an electrochemical active oxygen supply device for a washing machine and a preparation method. The device comprises a shell, a single closed reaction chamber is formed in the shell, a bifunctional anode electrode and a bifunctional cathode electrode are integrated in the reaction chamber, and a compact and uniform reaction area is formed between the anode electrode and the cathode electrode. When water flows through the reaction area, hydrogen peroxide (H2O2) and / or hydroxyl radicals (OH) are / is electrochemically generated on the surface in situ by accurately adjusting the electrode potential of the difunctional anode, so that instant generation and instant utilization of active oxygen are realized. The active oxygen directly enters a washing system of the washing machine along with water flow, bacteria, viruses and fungi can be efficiently inactivated under the normal-temperature or low-temperature washing condition without additionally adding chemical disinfectants, organic stains and peculiar smell molecules are synchronously degraded, and green, efficient and intelligent healthy washing is achieved.

The invention discloses a mesoporous biological ceramic filter sponge as well as a preparation method and application thereof, and belongs to the technical field of water treatment and air purification. The filtering sponge adopts a three-layer composite structure and comprises a three-dimensional porous sponge framework, a mesoporous ceramic transition layer and a nano metal thorn functional layer. Microorganism inactivation is achieved through a unique'adsorption-locking-puncturing 'physical mechanism, the inactivation rate of bacteria and viruses exceeds 99.9% under the condition that no chemical agent is used, meanwhile, heavy metal pollutants can be selectively removed, and beneficial mineral substances are reserved. The filtering sponge has the advantages of high porosity, large specific surface area, long service life and the like, and can be widely applied to the fields of drinking water treatment, sewage treatment, air purification and the like.

The invention provides a wastewater multi-stage treatment device for paper production, and relates to the technical field of wastewater treatment.The wastewater multi-stage treatment device comprises a tank body, a disinfection mechanism is arranged in the tank body, the outer surface of an inner cylinder is rotationally connected with a rotating ring plate through a bearing, and the upper surface of the rotating ring plate is fixedly connected with a first gear ring; the outer surface of the inner cylinder is rotatably connected with a plurality of supporting rods through bearings, and the outer surfaces of the supporting rods are fixedly connected with first gears. According to the invention, the ultraviolet lamp mounted on the outer surface of the rotating cylinder realizes multi-angle dynamic irradiation; by means of the design, the contact area of ozone and wastewater is remarkably increased, the coverage range and the sterilization path of the ultraviolet lamp are more comprehensive, the two treatment modes of ozone sterilization and ultraviolet irradiation act synergistically, the inactivation and decomposition effects on bacteria, viruses, organic pollutants and the like in the wastewater are effectively enhanced, the overall sterilization treatment efficiency is greatly improved, and the treatment cost is reduced. The wastewater treatment quality is ensured.

A household tap water pulsed intense light disinfection and sterilization device belongs to the technical field of household water equipment and comprises a water inlet connector, a water storage pipe body, a water outlet connector and a pulsed intense light sterilization lamp, the water inlet connector and the water outlet connector are communicated with an inner cavity of the water storage pipe body, and the pulsed intense light sterilization lamp is installed in the inner cavity of the water storage pipe body in a water insulation mode. The pulsed intense light sterilization lamp is arranged in the water storage pipe body and located between the water inlet connector and the water outlet connector, the wavelength of the pulsed intense light sterilization lamp is 200-1100 nm, the pulsed intense light sterilization lamp is installed in a household tap water pipe, and when water at the water inlet end of tap water flows into the inner cavity of the water storage pipe body from the water inlet connector, the whole process is irradiated by the pulsed intense light sterilization lamp. Bacteria, viruses and microorganisms in a water body can be thoroughly killed or decomposed under the irradiation of the intensive pulse light, so that each drop of water discharged from the faucet by people can be ensured to be non-toxic, sterile, sanitary and safe water.

The present invention relates to a method for preparing Gram-negative bacterial outer membrane-derived nanovesicles (OMNVs) and uses thereof. Additionally, the present invention provides a method for treating or diagnosing cancer using OMNVs. Furthermore, the present invention provides a method for delivering therapeutic or diagnostic substances to target cells or tissues by loading them into OMNVs. Also, the present invention provides a method for preventing and treating various diseases, including cancer and bacterial / viral infections, by co-administering OMNVs with antigens or administering OMNVs expressing antigens.

The present disclosure relates to a filter for a smoking device, such as, but not limited to, a water pipe, or a cigarette, such as, but not limited to, a cannabis cigarette. The filter includes a body that is positionable over a mouthpiece of the smoking device, to filter impurities from smoke drawn therethrough, and a base that secures the body over the mouthpiece such that smoke is drawn therethrough, prior to inhalation by a user. The body can include one of more filtration layers, such as a first layer formed from a material selected to filter carcinogens and other impurities from the smoke prior to inhalation, and a second layer formed from a material selected to minimize or prevent the transmission of bacteria, viruses, or other contagions from a user's mouth to the smoking device. Each of the filtration layers can also be formed from one or more materials.

The invention relates to compound herba houttuyniae eye drops as well as a preparation method and application of the compound herba houttuyniae eye drops. Comprising the following preparation raw materials in percentage by mass: 1-6% of a herba houttuyniae extracting solution, 1-5% of an aglaia odorata extracting solution, 1-2% of a gelidium amansii extracting solution, 0.1-0.3% of acyclovir, 0.1-0.3% of tobramycin, 0.01-0.1% of dexamethasone sodium phosphate, 0.1-1% of sodium hyaluronate, 0.1-3% of glycerol and 88-93% of purified water. According to the compound herba houttuyniae eye drops prepared by the preparation method disclosed by the invention, the herba houttuyniae extracting solution, the aglaia odorata extracting solution, the gelidium amansii extracting solution, the acyclovir, the tobramycin and the dexamethasone sodium phosphate are combined for use, so that the compound herba houttuyniae eye drops have a relatively good curative effect on pets suffering from bacterium and virus mixed infection type conjunctivitis / keratitis; the compound herba houttuyniae eye drops are good in high-temperature-resistant storage stability and good in curative effect, the problem of frequent administration can be reduced, and the compound herba houttuyniae eye drops are more convenient to use and store.

Photocatalytic sterilization technology is a technology that uses active substances generated by specific materials under light conditions to kill bacteria, viruses and other microorganisms. This technology mainly relies on the performance of photocatalytic materials, especially semiconductor materials such as titanium dioxide (TiO2). When the photocatalyst is irradiated by light of a specific wavelength, the electrons in the material transition from the valence band to the conduction band, forming electron-hole pairs. These electrons and holes have high chemical activity and can react with water or oxygen to generate free radicals with strong oxidizing ability, which can destroy the cell wall or cell membrane of microorganisms, causing the leakage of intracellular substances, thereby achieving the effect of sterilization. The present application aims to solve the problems of low light utilization rate and insufficient active sites of TiO2 photocatalytic materials, and proposes a TiO2@Ag / Ti-MOF functional material. The TiO2@Ag / Ti-MOF functional material is based on the Ti-MOF skeleton to construct Ag-MOF, realizing the controlled slow release of Ag ions and having a long-term effective sterilization effect.

The utility model relates to the technical field of medical instruments, and discloses a dysphagia nursing out-call box which comprises a sealing assembly, a sealing part, a sealing door, a sliding frame, a rack and a gear, the sliding frame is fixed to one side of the sealing door, the rack is fixed to the bottom of the sliding frame, the gear is located on one side of the rack, and the sealing door is connected with the gear. The gear is meshed with the rack, the moving assembly is arranged on the gear and comprises a moving part, the moving part comprises a moving strip, a guide strip, a guide plate and a shifting plate, and the moving strip is located on one side of the gear. The box has the advantages that the box covers are arranged to be in the opening and closing type, when the box body needs to be completely opened, the two box covers can be simultaneously and oppositely opened, when small articles are taken, the box body can be half opened, the interior does not need to be completely exposed, large-area exposure is avoided, invasion of dust, bacteria, viruses and the like is reduced, the articles are kept in a sterile state, and the hidden danger of infection of patients is reduced.

The utility model relates to the technical field of injection molding processing, in particular to a softened injection molding material feeding mechanism with a spray sterilization device. According to the technical scheme, an auger is rotationally installed in a charging barrel through a first retainer, a cover plate is installed at the top end of the charging barrel, a motor is installed on the cover plate, and a magnetic coupler is installed at the top end of the auger; the motor is in magnetic coupling with a magnetic coupler of the auger through a magnetic coupler of the speed reducer, a medicament box is installed on the portion, located on one side of the motor, of the cover plate, a liquid storage box is installed above the magnetic coupler of the speed reducer, and medicaments in the medicament box are sprayed out through an atomizing nozzle of the liquid storage box. According to the utility model, medicaments in the liquid storage box are pumped out through the water pump and are uniformly sprayed on raw materials in the charging barrel through the atomizing nozzle, so that microorganisms such as bacteria, viruses and the like in the raw materials are effectively killed, and the sanitary quality and the safety of products are improved.

The utility model relates to the technical field of operating room air supply devices, in particular to an operating room air supply device with an air treatment system, which comprises a ventilation pipeline, a baffle is fixedly mounted on the lower side of the ventilation pipeline, and a plurality of ventilation openings are formed in the baffle. The automatic replacement structure is driven by the motor to automatically replace the filter element, so that medical staff do not need to manually replace the filter element, the old filter element can be automatically cleaned and sterilized after being replaced, the risk that the medical staff is infected by the filter element is reduced, the replacement process is simple and easy to operate, the air supply structure is further driven to send out gas with bacteria and viruses, and the service life of the medical staff is prolonged. And through the combined action of the multiple fans, the situation that the suction force of the air supply device is weak due to external factors during air supply, and consequently the purification efficiency of air in the operating room is low is avoided.

The environment-friendly technology for rubber paste production comprises the following steps that S1, pretreatment is conducted, specifically, waste water generated in the rubber paste production process enters a pretreatment pool to be pretreated, a grating and a screen are arranged in the pretreatment pool, and large suspended solids in the waste water are removed; s2, mixing reaction: introducing water into stirring equipment, adding a liquid medicine according to the quality of the wastewater, and rapidly mixing the liquid medicine with the wastewater through the stirring equipment to neutralize the pH value and the drug power in the wastewater. S4, precipitation: feeding the wastewater subjected to the mixed reaction into a precipitation tank, and standing for a certain time to obtain preliminarily clarified water. And S5, filtering: enabling the clarified water to pass through a filter tank, and intercepting residual fine suspended matters and colloidal substances. S6, disinfection: adding a disinfectant into the filtered water to kill pathogenic microorganisms such as bacteria and viruses in the water. The stirring equipment in the step S2 comprises a stirring tank, so that the liquid medicine can be quickly diffused in each layer and region of the water body.

According to the secondary water supply reservoir capable of guaranteeing continuous water supply, the sterilization and disinfection mechanism capable of being folded is installed in the reservoir body, during normal water supply, a first connecting rod in the sterilization and disinfection mechanism is horizontally arranged, a second connecting rod in the sterilization and disinfection mechanism is vertically arranged, all ultraviolet sterilization lamps can be evenly arranged in the reservoir body, and the corresponding sterilization and disinfection effect is achieved; when a worker needs to enter the water tank for cleaning, the second connecting rod can be rotationally close to and connected to the first connecting rod, and is folded and gathered to be stored in the center of the water tank when not in use, so that interference of a traditional fixed disinfection device on cleaning operation of the worker is avoided, and the cleaning efficiency is improved; meanwhile, the ultraviolet germicidal lamp is arranged so that microorganisms such as bacteria and viruses in water can be effectively killed, the water quality safety is improved, and water supply sanitation is guaranteed.

The utility model discloses an indoor microorganism disinfection and purification system which comprises a shell, the shell is provided with an air inlet and an air outlet, the shell is provided with a purification device, a disinfection device and a centrifugal fan, and the purification device, the disinfection device and the centrifugal fan are sequentially arranged in the airflow direction; the disinfection device comprises a photocatalyst layer and a plurality of ultraviolet lamp tubes, and the photocatalyst layer and the ultraviolet lamp tubes are sequentially arranged in the direction from the air inlet to the air outlet. The disinfection device is composed of a photocatalyst layer and a plurality of ultraviolet lamp tubes, under ultraviolet irradiation, the photocatalyst layer can generate hydroxyl free radicals and superoxide anion free radicals with strong oxidizing property, and the free radicals can be rapidly subjected to oxidation-reduction reaction with bacteria, viruses, formaldehyde and other harmful microorganisms and organic pollutants in the air, so that the disinfection effect is achieved. The cell structure or molecular chain is destroyed and decomposed into harmless substances such as carbon dioxide, water and the like, so that the purposes of disinfection and purification are achieved.

An air sterilization device includes a housing, a porous wheel, a fan and a sterilization module. The housing has an air inlet and an air outlet. The fan is arranged in the housing to draw external air into the housing through the air inlet. The external air is filtered and sterilized by the porous wheel and the sterilization module, and then the clean air is discharged from the air outlet. The sterilization module is arranged beside the porous wheel. The sterilization module can sterilize the air flowing through the sterilization module and sterilize the porous wheel by relative rotation between the porous wheel and the sterilization module to kill the bacteria and viruses attached to the porous wheel, so that the sterilization efficiency of the air sterilization device is improved.

The invention discloses a respiratory nursing, diagnosis and detection device for the pneumology department, and belongs to the technical field of medical instruments, the respiratory nursing, diagnosis and detection device comprises a respirator, the outer wall of the respirator is communicated with an oxygen connector used for introducing oxygen, an electric push rod is fixedly installed on the outer wall of the respirator and located below the oxygen connector, and an electric push rod is fixedly installed on the inner side of the respirator. A gooseneck pipe is arranged corresponding to the telescopic end of the electric push rod, the other end of the gooseneck pipe is connected with a first spring seat, exhaled gas is directly discharged through the independent first output pipe to be detected, mixing dilution of the exhaled gas and inhaled oxygen is effectively prevented, the purity of an exhaled gas sample is guaranteed, and the exhaled gas sample can be accurately detected. Therefore, the accuracy of the analysis result of the gas sensor is improved, a piston cylinder disinfection mechanism integrated with automatic disinfection and pollution residue prevention is adopted, disinfection gas can be automatically sucked and pushed after each time of use, a nose connector and a sampling pipeline are sterilized, and cross contamination caused by bacterial virus reproduction to subsequent detection is avoided.

The utility model relates to a monkey animal transfer cage which is characterized in that a base is arranged at the bottom of a transfer cage body, a cage door is arranged on the front side of the transfer cage body, the cage door and a stand column on one side of the transfer cage body are rotatably mounted, a feeding trough is mounted at the position, close to the bottom, of the front side of the cage door, and a drinking bottle is mounted at the position, located on the left side, of the front side of the cage door; the rotating handle is rotated to enable the conveying belt to drive excrement to be conveyed into the collecting box, in the conveying process of the conveying belt, the scraping plate installed at the top of the collecting box can scrape the surface of the conveying belt, the excrement is prevented from being attached to the conveying belt, cleaning is more thorough, and the excrement is prevented from being accumulated in the transfer cage; and meanwhile, a second screw rod is rotated, so that a fixed seat is separated, and a worker can conveniently replace or clean the scraping plate.

The invention provides a medical lighting system with a regulation and control function, and relates to the field of medical lighting. A hoisting cylinder is fixedly arranged at the bottom of the mounting seat, and an adjusting column is movably arranged in the hoisting cylinder; a first angle adjusting assembly is fixedly arranged at the bottom end of the adjusting column, and a second angle adjusting assembly is fixedly arranged at the bottom of the first angle adjusting assembly. A lighting unit is fixedly arranged at the bottom of the second angle adjusting assembly, and an adjusting and controlling assembly is fixedly arranged on the outer side of the lighting unit. Energy-saving units are fixedly arranged on the two sides of the lighting unit, a control structure is fixedly arranged on the outer side of the lighting unit, and bacteria and viruses attached to the surface of the lens plate can be decomposed and killed through the lighting unit and the energy-saving units; meanwhile, the power generation plate can be used for generating power, the energy-saving effect is improved, and the problems that disinfection is difficult, and a hotbed for bacterium breeding is likely to be formed are solved.

The utility model discloses an ultraviolet disinfection lamp for drinking water, which comprises a base, an electric cylinder body, a ring body, a ring body and a power component, the base is connected with a support plate through a bracket, the electric cylinder body is arranged on the support plate, a telescopic rod of the electric cylinder body vertically extends downwards and is connected with a movable plate, and an ultraviolet disinfection lamp group is arranged on the lower side of the movable plate. The ring body is rotationally arranged on the movable plate, a movable rod is arranged on the ring body, the movable rod vertically extends downwards, a shifting piece is arranged on the movable rod, and the power assembly is used for driving the ring body to rotate; the movable rod rotates around the ultraviolet disinfection lamp set, and drinking water stored in the container is disturbed through the shifting piece, so that the drinking water flows in the container and is fully irradiated by the ultraviolet disinfection lamp set, the disinfection effect on the drinking water is effectively provided, and bacteria, viruses and the like contained in the drinking water are killed; the ultraviolet disinfection lamp can be moved to different positions to disinfect drinking water in different containers.

The present invention provides a network-based intelligent contactless toilet mat replacement device, comprising: a replacement chamber housing, a toilet body, a toilet cover, and a control unit; the replacement chamber housing is disposed on the toilet body, a toilet mat storage chamber and a conveying device are disposed within the replacement chamber housing, the toilet mat storage chamber being used to place a multi-layer folded toilet mat, a working outlet is disposed at the bottom of the housing, and the conveying device is capable of driving the toilet mat from the working outlet to the outside of the replacement chamber housing; the toilet cover is rotatably disposed on the housing, with the working outlet located below the toilet cover; a control unit is disposed within the replacement chamber housing, the control unit controls the conveying device to open or close according to an input signal, and the control unit controls the rotation of the toilet cover according to the input signal. In this solution, the buttocks washing and drying functions are abandoned, better isolation and suppression of the spread and cross-infection of bacteria and viruses are achieved, and safety and comfort are improved.

The application provides a virus aerosol transmission blocking device, comprising: a base; an air outlet assembly arranged on the base and provided with an air outlet; a high-pressure fan arranged on the base and having an air outlet end communicated with the air outlet through an air supply pipeline; the high-pressure fan provides high-pressure gas which is sprayed out through the air outlet to form an air curtain; and a disinfection assembly arranged at an air inlet end of the high-pressure fan and used for disinfecting the air inlet of the high-pressure fan. The blocking device forms an air curtain between two parties in communication by using purified air, the air curtain can isolate the air circulation of two areas, thereby blocking the aerosol transmission path and preventing the transmission of bacteria and viruses.

The utility model discloses multifunctional deodorization and sterilization equipment, which relates to the technical field of deodorization and sterilization equipment, and comprises a casing, a purification cavity and a control cavity are arranged in the casing, a laminate is arranged in the purification cavity, the purification cavity is divided into an upper channel and a lower channel by the laminate, and the upper channel is communicated with the control cavity. An upper layer ultraviolet lamp set is fixedly installed on the upper end face of the layer plate, a lower layer ultraviolet lamp set is fixedly installed at the bottom of the layer plate, a first photocatalyst carrier is fixedly installed at the bottom of the lower channel, and a second photocatalyst carrier is fixedly installed at the top of the upper channel. According to the utility model, the purification cavity is divided into the upper channel and the lower channel by the laminate, and air sequentially passes through the two channels, so that the purification time in the equipment is obviously prolonged; the upper channel and the lower channel are respectively provided with the ultraviolet lamp group and the photocatalyst carrier, and are matched with the activated carbon filter plates in the intercommunication holes to form a multi-layer purification system, so that peculiar smell and harmful gas in the air can be more effectively removed, microorganisms such as bacteria and viruses can be killed, and the purification effect is greatly improved.

The present invention relates to a device (100; 200) for disinfecting any bacteria, viruses, dust or any other organic or inorganic bodies present in the air of public or private spaces using a disinfection chamber (110, 110"; 210) provided with a filter of laser beams (115, 115", 215). A dense grid of laser beams (115, 115", 215) is formed that saturates the disinfection chamber (110, 110"; 210). The air forced to pass through the entire disinfection chamber (110, 110"; 210) impacts every small particle, bacteria, virus, even nanometric, with laser beams (115, 115", 215), completely pulverizing, destroying and / or neutralizing itself by means of irradiation from a time ranging from 0.5 to 2 seconds of great beam energy.

The utility model relates to the technical field of water treatment, and discloses water treatment circulating filtration equipment for a container plant factory, which comprises a mounting base, a water inlet arranged at the top of a settling tank, a filter tank, a water storage tank, a water outlet arranged at the top of the settling tank, and a water outlet arranged at the top of the filter tank, firstly, a filter plate can block and remove large-particle floating objects, a handle can quickly take out the filter plate to be replaced and cleaned, an activated carbon layer removes organic matters, peculiar smell and pigments in water, a ceramic filter layer efficiently filters and retains beneficial minerals to remove bacteria, viruses and macromolecular organic matters, and the filter plate can be quickly taken out to be replaced and cleaned. Meanwhile, beneficial mineral substances such as potassium and sodium in the water are retained, the ultraviolet sterilizer sterilizes the filtered water, bacteria and viruses in the water are effectively killed again, the water quality safety is ensured, and the reverse osmosis equipment can further improve the water quality.

The present disclosure provides method of whole genome sequencing of microorganisms such as Gram-positive bacteria, Gram-negative bacteria, viruses, and fungi. The various methods comprising steps of isolating nucleic acid from the microorganism and preparing a library of the isolated nucleic acid. Preferably, the methods of whole genome sequencing described herein are automated to provide a robust and efficient sequencing product for various utilities.

The utility model discloses ozone sterilization equipment for barreled water production, which belongs to the technical field of barreled water ozone sterilization and is characterized in that a sealing cover is mounted at the upper end of a storage tank, a communicating pipeline is arranged at the upper part of the side wall of the storage tank, and a sterilization device is connected with the communicating pipeline through a connecting pipeline, a butt joint pipeline and an ozone radiating pipe; ozone is input into sterilization equipment to sterilize the barreled water; a first radiating fin and a second radiating fin are arranged outside the ozone radiating tube, and the first radiating fin and the second radiating fin are fixed through a fastening bolt. The ozone is used for disinfecting the barreled water, destroying the microbial structure and guaranteeing the water quality safety. According to the method, bacteria and viruses are effectively killed, peculiar smell is removed, and the water quality purity is improved. The ozone sterilization equipment adopts a double-radiating-fin design, so that the radiating efficiency is improved, the stable and reliable operation of the equipment is ensured, the service life is prolonged, and the maintenance cost is reduced. The valve adjusting system allows flexible control of ozone flow and pressure, meets water treatment requirements of different scales, and optimizes the sterilization effect.

The invention relates to the technical field of clothes treatment, in particular to clothes treatment equipment, and aims to solve the problem that the sterilization effect is reduced due to the fact that existing ozone is easily decomposed into oxygen in the conveying process. In order to achieve the purpose, the clothes treating equipment comprises an outer barrel, an inner barrel, a driving assembly and an oxygen activating assembly; the inner cylinder is positioned in the outer cylinder; the output end of the driving assembly is connected with the inner cylinder, and the driving assembly is arranged to be capable of driving the inner cylinder to rotate; the ozone assembly is arranged between the inner cylinder and the outer cylinder and is arranged to be capable of electrolyzing liquid in the outer cylinder to generate ozone. The liquid in the outer barrel is directly electrolyzed in the washing machine to generate ozone, the problem that a common detergent in a traditional washing machine cannot effectively remove peculiar smells, bacteria and viruses on clothes is solved, ozone is directly generated in the washing machine, ozone decomposition and degerming effect reduction in the conveying process are avoided, and the service life of the washing machine is prolonged. And the degerming effect in the washing process is ensured.

To provide a light source device and an inactivation device which are capable of inactivating bacteria and viruses without adversely affecting the human body even when an irradiation object in which many proteins are present is irradiated with ultraviolet light.SOLUTION: A light source device comprises a light-emitting unit that emits ultraviolet light and an optical system that propagates light emitted from the light-emitting unit, wherein the light-emitting unit comprises a point light source that emits light within a range of 225 nm or more and 235 nm or less, and the optical system receives light emitted from the light-emitting unit, exhibits a peak wavelength within a range of 225 nm or more and 235 nm or less, and emits light in which ultraviolet light within a range of 240 nm or more and 280 nm or less is limited.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of indoor environment adjustment, and discloses an indoor ecological health-care system which comprises an ecological room, and an embedded air pipe is fixedly mounted on the inner side of the ecological room. According to the indoor ecological health care system, by arranging the filter plate, the electrostatic dust collection net, the photocatalytic net, the negative ion generator, the cleaning assembly and other assemblies, the traditional passive purification mode of filter net interception is changed, the filter plate and the electrostatic dust collection net can effectively intercept particulate pollutants, the photocatalytic net can actively inhibit or decompose the activity of microorganisms, and the purification effect is improved. The negative ion generator generates negative ions, suspended particles in the air can be adsorbed and coagulated, the negative ions can be combined with bacteria, viruses and the like in the air, the structure of the air is destroyed, the microbial activity is reduced, multiple assemblies act synergistically, the purification treatment efficiency is greatly improved, the risk of secondary pollution in the high-humidity environment is reduced, frequent replacement of a filter screen is not needed, and the cost is reduced. The maintenance cost and the operation complexity are reduced, and a healthier and fresher indoor air environment is created.

The invention provides photocatalyst nanoparticles for air sterilization and a preparation method of the photocatalyst nanoparticles. The preparation method of the photocatalyst nano-particles for air sterilization comprises the steps of preparing nitrogen-doped titanium dioxide precursor sol, preparing nitrogen-doped titanium dioxide nano-particles, preparing a second mixed system and preparing Ag / Cu bimetallic loaded nitrogen-doped titanium dioxide nano-particles. According to the preparation method, the nitrogen doping amount, the calcining temperature and the heat preservation time are synergistically optimized, so that the obtained nitrogen-doped TiO2 nanoparticles have relatively high crystallinity and relatively large specific surface area while keeping stable existence of an anatase phase, thereby improving the separation efficiency of photo-induced electron-hole pairs and the number of surface active sites; under the irradiation of visible light, more hydroxyl free radicals, superoxide anion free radicals and peroxides can be generated, and bacteria, viruses and volatile organic compounds in the air can be efficiently oxidized, decomposed and inactivated. The invention also provides an air filtration nanofiber membrane.