Inorganic / polymer multi-component photocatalyst for antibiosis and its preparation method and application

Abstract

The application provides an inorganic / polymer multi-component photocatalyst for antibiosis and a preparation method and application thereof. The method comprises the following steps: preparing a porous sheet layer graphite phase carbon nitride with negative electricity and a polyethylene imine modified reduced graphene oxide with positive electricity respectively; adopting an electrostatic assembly method to obtain a polyethylene imine / reduced graphene oxide / graphite phase carbon nitride "sandwiched" assembly structure; introducing chloroaurate ions into the obtained assembly structure; and utilizing the reducing property of the polyethylene imine to penetrate gold nano ions into the surface interface of the assembly structure, so as to obtain a multi-component photocatalyst of the polyethylene imine / reduced graphene oxide / graphite phase carbon nitride / gold nano particle composite. The multi-component photocatalyst is prepared by the technical means of electrostatic assembly and polyelectrolyte reduction, is efficient and low in energy consumption, can be used for efficiently generating hydrogen peroxide in situ, and can further obtain effective photocatalytic antibiosis performance, and has a wide application prospect in the field of antibacterial materials.

Description

Technical Field

[0001] This invention belongs to the field of materials science and technology, specifically relating to an inorganic / polymer multi-component photocatalyst for antibacterial purposes, its preparation method, and its application. Background Technology

[0002] Supramolecular self-assembly is an effective strategy for chemical researchers to develop novel multi-component coupled functional systems by enabling assembly units to spontaneously form ordered and controllable structures through non-covalent interactions. The non-covalent interactions primarily relied upon for self-assembly include electrostatics, hydrogen bonding, host-guest interactions, and π-π stacking interactions. Among these, electrostatic assembly is currently the most widely used method, primarily relying on electrostatic interactions to assemble two materials with opposite charges, thereby obtaining assembled materials with good stability. This method is simple, efficient, and uses widely available assembly materials, without being limited by shape.

[0003] With societal development, people's health awareness has increased. Currently, infectious diseases caused by bacteria have become a deadly problem for humanity. Many traditional antibacterial materials that rely on antibiotics, metal ions, and quaternary ammonium ions have drawbacks such as ecotoxicity, environmental harm, limited application methods, low antibacterial efficacy, easy inactivation, inability to repeatedly generate antibacterial efficacy, and inconvenience in daily use.

[0004] The development of photocatalysis has promoted the application of various photocatalysts in antibacterial therapy. Photocatalytic antibacterial action mainly falls into two categories. One method, unlike enzyme-based treatments, uses hydrogen peroxide as an essential external reactant specifically added to catalyze the generation of hydroxyl radicals. This photocontrolled catalytic therapy is not limited by hydrogen peroxide, but requires a large input of light energy to generate reactive oxygen species, which can be harmful to the human body and hinders practical application. The other method involves using light energy to perform a redox reaction to produce hydrogen peroxide, thereby achieving an antibacterial effect. However, in the current photocatalytic hydrogen peroxide production process, photogenerated electrons and holes easily recombine, reducing photocatalytic performance and limiting its large-scale application.

[0005] Therefore, designing a simple method to obtain a photocatalyst for the efficient production of hydrogen peroxide, thereby achieving excellent antibacterial properties, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing an inorganic / polymer multi-component photocatalyst for antibacterial purposes. Specifically, a multi-component synergistic photocatalyst is rapidly constructed through electrostatic assembly. The overall process is simple, efficient, green, and sustainable, with low energy consumption and equipment requirements. The production process is easy to control, exhibits good stability, and is particularly suitable for large-scale industrial production.

[0007] To achieve the above objectives, the present invention provides a method for preparing an inorganic / polymeric multi-component photocatalyst for antibacterial purposes, comprising the following steps:

[0008] Negatively charged porous sheet-like carbon nitride and positively charged polyethyleneimine-modified reduced graphene oxide were prepared separately. Using an electrostatic assembly method, a "sandwich" assembly structure of polyethyleneimine / reduced graphene oxide / carbon nitride was obtained.

[0009] Chloroaurate ions were introduced into the obtained assembly structure, and gold nanoparticles were inserted into the interface of the assembly structure by utilizing the self-reducing property of polyethyleneimine, thus obtaining a multi-component photocatalyst of polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite.

[0010] In a preferred embodiment, the porous sheet-like graphitic carbon nitride is prepared by the following method: melamine is uniformly dispersed in deionized water; the resulting solution is first subjected to a hydrothermal reaction, and the resulting product is dried; then calcined at a high temperature of 500-550°C to obtain porous sheet-like graphitic carbon nitride.

[0011] Preferably, the mass-to-volume ratio of melamine to deionized water is (0.63-2.52) g:(17.5-70) mL;

[0012] Preferably, the hydrothermal reaction temperature is 140-220℃ and the hydrothermal reaction time is 12-36 hours;

[0013] Preferably, the drying conditions can be conventional methods known to those skilled in the art, such as placing the reaction product in a forced-air drying oven and drying it at 60-80°C for 2-4 hours;

[0014] Preferably, the high-temperature calcination time is 3-6 hours.

[0015] In a preferred embodiment, the polyethyleneimine-modified reduced graphene oxide is prepared by the following method: dissolving graphene oxide and polyethyleneimine separately in water to obtain a graphene oxide dispersion and a polyethyleneimine aqueous solution; mixing the graphene oxide dispersion and the polyethyleneimine aqueous solution at a volume ratio of 1:(0.5-2) and stirring to react; heating the mixture obtained from the reaction in an oil bath, washing and drying the reaction product to obtain the polyethyleneimine-modified reduced graphene oxide;

[0016] Preferably, the concentration of the graphene oxide dispersion is 50-500 mg / L, and the concentration of the polyethyleneimine aqueous solution is 2.5-10 g / L;

[0017] Preferably, the volume ratio of the graphene oxide dispersion to the polyethyleneimine aqueous solution is 1:1;

[0018] Preferably, the stirring reaction time is 10-15 minutes;

[0019] Preferably, the oil bath heating temperature is 80-100℃, and the oil bath heating time is 2-4 hours;

[0020] Preferably, the washing method can be a conventional method known to those skilled in the art, such as centrifugal washing with deionized water, and the drying conditions can be a conventional method known to those skilled in the art, such as placing the product obtained from the reaction in a forced-air drying oven and drying it at 60-80°C for 2-4 hours.

[0021] In a preferred embodiment, the electrostatic assembly method includes the following steps: dissolving the porous sheet-like graphitic carbon nitride and polyethyleneimine-modified reduced graphene oxide in water respectively; mixing the resulting liquids at a volume ratio of 1:(0.5-2) and stirring to react; washing and drying the resulting reactants to obtain a polyethyleneimine / reduced graphene oxide / graphitic carbon nitride "sandwich" assembled structure;

[0022] Preferably, the concentration of the porous sheet graphitic carbon nitride solution is 50-200 mg / L, and the concentration of the polyethyleneimine-modified reduced graphene oxide solution is 2.5-10 g / L.

[0023] Preferably, the volume ratio of the obtained liquids is 1:1;

[0024] Preferably, the stirring reaction time is 1-3 hours;

[0025] Preferably, the washing method can be a conventional method known to those skilled in the art, such as rinsing with deionized water 2-4 times, and the drying conditions can be a conventional method known to those skilled in the art, placing the reaction product in a forced-air drying oven and drying at 60-80°C for 2-4 hours.

[0026] In a preferred embodiment, the method for introducing chloroaurate ions into the obtained assembly structure includes the following steps: dissolving the assembly structure and chloroauric acid tetrahydrate in water respectively; mixing the resulting liquids at a volume ratio of 1:(0.5-2) and stirring to react; washing and drying the resulting reactants to obtain the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride "sandwich" assembly structure.

[0027] Preferably, the concentration of the assembled structure dispersion is 125-500 mg / L, and the concentration of the chloroauric acid tetrahydrate aqueous solution is 5-20 mmol / L;

[0028] Preferably, the volume ratio of the obtained liquids is 1:1;

[0029] Preferably, the stirring reaction time is 3-72 hours;

[0030] Preferably, the washing method can be a conventional method known to those skilled in the art, such as rinsing with deionized water 2-4 times, and the drying conditions can be a conventional method known to those skilled in the art, placing the reaction product in a forced-air drying oven and drying at 60-80°C for 2-4 hours.

[0031] Another object of the present invention is to provide an inorganic / polymer multi-component photocatalyst for antibacterial purposes prepared by any of the above methods. In the obtained multi-component photocatalyst, gold nanoparticles are embedded in the interface of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride assembly structure, which can efficiently promote the separation of electron / hole pairs, thereby improving the photocatalytic activity of the material.

[0032] Another object of the present invention is to provide the application of the inorganic / polymer multi-component photocatalyst for antibacterial purposes prepared by any of the above methods in the production of hydrogen peroxide and / or inactivation of bacteria.

[0033] In a preferred embodiment, the method for producing hydrogen peroxide includes the following steps:

[0034] The multi-component photocatalyst is dissolved in isopropanol and / or deionized water to obtain a dispersion with a concentration of 400-440 mg / L. The pH of the dispersion is adjusted to 2-8, and hydrogen peroxide can be produced under light conditions.

[0035] Preferably, the volume ratio of isopropanol to deionized water is 1:(3-5); more preferably, the volume ratio of isopropanol to deionized water is 1:4.

[0036] Preferably, the pH of the adjusted dispersion is 3-7; more preferably, the pH of the adjusted dispersion is 3, 4, 5, 6, or 7.

[0037] Preferably, when the dispersion is at pH 3, a xenon lamp light source is used to simulate sunlight, and the hydrogen peroxide yield is 2207.1 μmol / g / h; more preferably, the xenon lamp light source is 300W.

[0038] In a preferred embodiment, the method for inactivating bacteria includes the following steps:

[0039] The multi-component photocatalyst is dissolved in isopropanol and / or deionized water. The dispersion is then mixed with the bacterial solution at a volume ratio of 1:(0.5-2), allowed to stand, and the bacteria are inactivated under light conditions.

[0040] Preferably, the volume ratio of isopropanol to deionized water is 1:(3-5); more preferably, the volume ratio of isopropanol to deionized water is 1:4.

[0041] Preferably, the concentration of the dispersion is 400-440 mg / L;

[0042] Preferably, the concentration of the bacterial solution is 1.0 × 10⁻⁶. 7 CFU mL -1 .

[0043] Preferably, the volume ratio of the dispersion to the bacterial solution is 1:(0.5-2); more preferably, the volume ratio of the dispersion to the bacterial solution is 1:1.

[0044] Preferably, the settling time is 0.5-1 hour.

[0045] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0046] (1) This invention uses electrostatic assembly and polyelectrolyte reduction techniques to prepare an inorganic / polymer multi-component photocatalyst for antibacterial purposes with high efficiency and low energy consumption. The overall process is simple to operate, energy-saving and environmentally friendly, highly repeatable, and can be mass-produced, with a promising future for sustainable development.

[0047] (2) The gold nanoparticles in the photocatalyst prepared in this invention are embedded in the interface of the polyethyleneimine / reduced graphene oxide / graphite phase carbon nitride assembly structure, which can efficiently promote the separation of electron / hole pairs, thereby effectively improving the photocatalytic performance.

[0048] (3) The photocatalyst prepared by the present invention can be used to efficiently generate hydrogen peroxide in situ, thereby obtaining effective photocatalytic antibacterial properties. Attached Figure Description

[0049] These and / or other aspects and advantages of the present invention will become clearer and more readily understood from the following detailed description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

[0050] Figure 1 This is a potential change spectrum of each component sample obtained in Example 1 of the present invention.

[0051] Figure 2 The image shown is a transmission electron microscope (TEM) image of the product obtained in Example 1 of this invention; wherein, Figure 2 a is a transmission electron microscope image of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride "sandwich" assembly structure obtained in step 6. Figure 2 b is a transmission electron microscope image of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite obtained in step 7.

[0052] Figure 3 The fluorescence lifetime spectrum of the sample obtained in steps 3 and 7 of Example 1 of this invention is shown.

[0053] Figure 4 The graph shows the hydrogen peroxide production performance of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite obtained in Example 1 of this invention under sunlight.

[0054] Figure 5 The image shows the antibacterial properties of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite obtained in Example 1 of this invention. Detailed Implementation

[0055] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0056] This invention provides an inorganic / polymer multi-component photocatalyst for antibacterial purposes, its preparation method, and its application. This addresses the problems in the prior art where the preparation of photocatalysts is complex, energy-intensive, and prone to recombination of photogenerated electrons and holes during the photocatalytic production of hydrogen peroxide, leading to a decrease in photocatalytic performance.

[0057] The technical solution of this application will be described in detail below through specific embodiments:

[0058] Unless otherwise specified, the technical means used in this invention are conventional means well known to those skilled in the art. All raw materials, reagents, instruments, and equipment used in this invention can be purchased commercially or prepared using existing methods. Unless otherwise specified, all reagents used in this invention are of analytical grade.

[0059] Example 1

[0060] I. Preparation of porous sheet-like graphitic carbon nitride:

[0061] 1. Weigh 1.26g of melamine and place it in 35mL of deionized water, then ultrasonically disperse it evenly;

[0062] 2. The dispersion from step 1 was reacted at 180°C for 24 hours using a hydrothermal synthesis method. After the reaction was completed, the product was dried in a forced-air oven at 60°C for 2 hours.

[0063] 3. The product obtained in step 2 is calcined at 520℃ for 4 hours to obtain porous sheet-like graphitic carbon nitride;

[0064] II. Preparation of polyethyleneimine / reduced graphene oxide composite structure:

[0065] 4. Using water as a solvent, prepare a 500 mg / L graphene oxide dispersion and a 10 g / L polyethyleneimine aqueous solution, respectively.

[0066] 5. Mix the graphene oxide dispersion and the polyethyleneimine aqueous solution at a volume ratio of 1:1 for 15 minutes. Then, place the mixture in an oil bath at 100°C for 4 hours, centrifuge and wash with deionized water, and then dry it in a forced-air oven at 60°C for 2 hours to obtain a polyethyleneimine / reduced graphene oxide composite structure.

[0067] III. Preparation of a polyethyleneimine / reduced graphene oxide / graphitic carbon nitride "sandwich" assembly structure:

[0068] 6. Add water to the samples obtained in steps two and three to prepare concentrations of 100 mg / L and 5 g / L respectively, mix and stir at a volume ratio of 1:1 for 2 hours, wash with deionized water by centrifugation and dry at 60°C for 2 hours to obtain a polyethyleneimine / reduced graphene oxide / graphitic carbon nitride "sandwich" assembly structure.

[0069] IV. Preparation of Polyethyleneimine / Reduced Graphene Oxide / Graphite Phase Carbon Nitride / Gold Nanoparticle Composite Photocatalyst:

[0070] 7. Using water as a solvent, prepare a 250 mg / L polyethyleneimine / reduced graphene oxide / graphitic carbon nitride dispersion and a 10 mmol / L chloroauric acid tetrahydrate aqueous solution. Mix the two samples at a volume ratio of 1:1 and react for 1 day. Then, wash with deionized water by centrifugation and dry at 60°C for 2 hours to obtain a multi-component photocatalyst in which gold nanoparticles penetrate the interface of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride assembly structure.

[0071] V. Effect Verification: The prepared multi-component photocatalyst was subjected to hydrogen peroxide production and antibacterial experiments, respectively. The specific steps included:

[0072] Hydrogen peroxide production: A mixed solution was prepared using isopropanol and deionized water at a volume ratio of 1:4. The multi-component photocatalyst prepared was then used to prepare a dispersion with a concentration of 420 mg / L. The pH of the dispersion was adjusted using hydrochloric acid and sodium hydroxide as acid-base regulators. The dispersion was then irradiated with a 300 W xenon lamp. The concentration of hydrogen peroxide in the dispersion was determined using the tetramethylbenzidine colorimetric method at different time points.

[0073] Antibacterial: A mixed solution was prepared using isopropanol and deionized water at a volume ratio of 1:4. The prepared multi-component photocatalyst was then formulated into a dispersion with a concentration of 420 mg / L using this mixed solution. The cultured Staphylococcus aureus solution (1.0 × 10⁻⁶) was then... 7 CFU mL -1The mixture was combined with the obtained multi-component photocatalyst dispersion at a volume ratio of 1:1, allowed to stand in the dark for 1 hour, and then sterilized by irradiation with a 300W xenon lamp for 10 minutes. After the experiment, the bacteria were freeze-dried and scanned using a scanning electron microscope to observe their morphology.

[0074] Example 2

[0075] The difference between this embodiment and Example 1 is that in step 7, a 5 mmol / L aqueous solution of chloroauric acid tetrahydrate is prepared; otherwise, it is the same as Example 1.

[0076] Example 3

[0077] The difference between this embodiment and Example 1 is that in step 7, a 15 mmol / L aqueous solution of chloroauric acid tetrahydrate is prepared; otherwise, it is the same as Example 1.

[0078] Example 4

[0079] The difference between this embodiment and Example 1 is that step 7 involves preparing a 20 mmol / L aqueous solution of chloroauric acid tetrahydrate; otherwise, it is the same as Example 1.

[0080] Example 5

[0081] The difference between this embodiment and Embodiment 1 is that the reaction time in step 7 is 3 hours; otherwise, it is the same as Embodiment 1.

[0082] Example 6

[0083] The difference between this embodiment and Embodiment 1 is that the reaction time in step 7 is 3 days; otherwise, it is the same as Embodiment 1.

[0084] Results and Discussion:

[0085] Figure 1 The potential change spectra of the components obtained in Example 1 of this invention show that the potential of the graphitic carbon nitride obtained in step 3 is -26 eV, the potential of the reduced graphene oxide / polyethyleneimine composite structure obtained in step 5 is +39 eV, and after assembly, the potential of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite photocatalyst obtained in step 7 is -20 eV, indicating that the assembly process was successful.

[0086] Figure 2 a represents the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride "sandwich" assembly structure obtained in step 6 of Example 1 of this invention. Figure 2 b is a transmission electron microscope image of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite obtained in step 7 of Example 1 of the present invention, indicating that the synthesis of the multi-component photocatalyst was successful.

[0087] Figure 3 The fluorescence lifetime spectrum of the sample obtained in steps 3 and 7 of Example 1 of this invention is shown. The fluorescence lifetime of pure graphitic carbon nitride is 3.8 nanoseconds, which is less than the 5.9 nanoseconds of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite. This indicates that the composite promotes the separation of electron / hole pairs.

[0088] Figure 4 The graph shows the hydrogen peroxide production performance of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite obtained in Example 1 of this invention under sunlight. The hydrogen peroxide concentration produced by the composite at pH 7 for 8 hours reached 4.41 mmol / L, which is 6.3 times that of pure graphitic carbon nitride. When the pH was adjusted to 3, the concentration of hydrogen peroxide produced by the composite reached 7.71 mmol / L.

[0089] Figure 5 The image shows the antibacterial properties of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite obtained in Example 1 of this invention. The antibacterial experiment shows that when the composite was added to Staphylococcus aureus for cultivation, the bacteria showed no damage before light exposure (Figure b). However, after light exposure, the bacterial morphology was largely destroyed (Figure c), indicating that the composite has a significant bactericidal ability under light. Figure a represents the control group. Figure 5 It can be seen that the multi-component photocatalyst prepared in the embodiments of the present invention has an antibacterial rate of over 99% after 10 minutes of light irradiation.

[0090] This invention enables the simple and efficient construction of multi-component photocatalysts, exhibiting excellent dispersibility in water, along with high-efficiency hydrogen peroxide production and antibacterial properties. It holds great promise for long-term use in antibacterial protective materials. The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical applications, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for preparing an inorganic / polymer multi-component photocatalyst for antibacterial purposes, characterized in that, Includes the following steps: Negatively charged porous sheet-like carbon nitride and positively charged polyethyleneimine-modified reduced graphene oxide were prepared separately. Using an electrostatic assembly method, a sandwich assembly structure of polyethyleneimine / reduced graphene oxide / carbon nitride was obtained. Chloroaurate ions were introduced into the obtained assembly structure, and gold nanoparticles were inserted into the surface and interface of the assembly structure by utilizing the self-reducing property of polyethyleneimine, thus obtaining a multi-component photocatalyst of polyethyleneimine / reduced graphene oxide / graphitic carbon nitride / gold nanoparticle composite. The porous sheet-like graphitic carbon nitride is prepared by the following method: melamine is uniformly dispersed in deionized water; the resulting solution is first subjected to a hydrothermal reaction, and the product is dried; then calcined at a high temperature of 500-550℃ to obtain porous sheet-like graphitic carbon nitride; wherein the mass-volume ratio of melamine to deionized water is (0.63-2.52) g : (17.5-70) mL; The polyethyleneimine-modified reduced graphene oxide is prepared by the following method: graphene oxide and polyethyleneimine are dissolved in water to obtain a graphene oxide dispersion and a polyethyleneimine aqueous solution; the graphene oxide dispersion and the polyethyleneimine aqueous solution are mixed at a volume ratio of 1:(0.5-2) and stirred to react; the mixture obtained from the reaction is heated in an oil bath, and the reaction product is washed and dried to obtain the polyethyleneimine-modified reduced graphene oxide; wherein the concentration of the graphene oxide dispersion is 50-500 mg / L, and the concentration of the polyethyleneimine aqueous solution is 2.5-10 g / L.

2. The preparation method of the inorganic / polymer multi-component photocatalyst for antibacterial purposes as described in claim 1, characterized in that, The electrostatic assembly method includes the following steps: dissolving the porous sheet graphitic carbon nitride and polyethyleneimine-modified reduced graphene oxide in water respectively; mixing the resulting liquids at a volume ratio of 1:(0.5-2) and stirring to react; washing and drying the resulting reactants to obtain a sandwich assembly structure of polyethyleneimine / reduced graphene oxide / graphitic carbon nitride; wherein the concentration of the porous sheet graphitic carbon nitride solution is 50-200 mg / L, and the concentration of the polyethyleneimine-modified reduced graphene oxide solution is 2.5-10 g / L.

3. The preparation method of the inorganic / polymer multi-component photocatalyst for antibacterial purposes as described in claim 1, characterized in that, The method for introducing chloroaurate ions into the obtained assembly structure includes the following steps: dissolving the assembly structure and chloroauric acid tetrahydrate in water respectively; mixing the resulting liquids at a volume ratio of 1:(0.5-2) and stirring to react; washing and drying the resulting reactants to obtain a multi-component photocatalyst in which gold nanoparticles penetrate the interface of the polyethyleneimine / reduced graphene oxide / graphitic carbon nitride assembly structure; wherein the concentration of the assembly structure dispersion is 125-500 mg / L and the concentration of the chloroauric acid tetrahydrate aqueous solution is 5-20 mmol / L.

4. An inorganic / polymer multi-component photocatalyst for antibacterial purposes prepared by the method described in any one of claims 1-3.

5. The application of the antibacterial inorganic / polymer multi-component photocatalyst prepared by any one of claims 1-3 in the production of hydrogen peroxide.

6. The application as described in claim 5, characterized in that, The method for producing hydrogen peroxide includes the following steps: dissolving the multi-component photocatalyst in isopropanol and / or deionized water to obtain a dispersion with a concentration of 400-440 mg / L, adjusting the pH of the dispersion to 2-8, and then producing hydrogen peroxide under light conditions.

7. The application as described in claim 6, characterized in that, With the dispersion at pH 3, a xenon lamp light source was used to simulate sunlight, and the hydrogen peroxide yield was 2207.1 μmol / g / h.

8. The application of the inorganic / polymer multi-component photocatalyst for antibacterial purposes prepared by the method according to any one of claims 1-3 in the inactivation of bacteria.

9. The application as described in claim 8, characterized in that, The method for inactivating bacteria includes the following steps: The multi-component photocatalyst is dissolved in isopropanol and / or deionized water, the dispersion is mixed with the bacterial solution, and after standing, the bacteria can be inactivated under light conditions.

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