Oxygen-doped carbon nitride for antibacterial and method of preparation and use thereof

Abstract

The present application relates to a kind of for antibacterial oxygen-doped carbon nitride and its preparation method and application.Preparation method includes: after mixing urea, melamine, oxygen source and solvent, it is made into supermolecular state solid, wherein the mass ratio of the urea, the melamine and the oxygen source is (2-5):(1-3):(0.5-4);The supermolecular state solid is calcined, and oxygen-doped carbon nitride is obtained, the morphology of the oxygen-doped carbon nitride is nanosheet, and oxygen doping rate is 5%-60%.The oxygen-doped carbon nitride obtained by the preparation method has excellent photocatalytic activity, and has excellent inhibitory effect on bacteria.

Description

Technical Field

[0001] This invention relates to the field of antibacterial technology, and in particular to an oxygen-doped carbon nitride for antibacterial purposes, its preparation method, and its application. Background Technology

[0002] Early blight of tomato, also known as ring spot or summer blight, is a plant disease caused by *Alternaria solanacearum*. Its most prominent characteristic is the presence of distinct concentric rings on lesions, whether on fruit, leaves, or main stem, hence the name "ring spot." Fruit lesions often appear near the fruit stem, stem lesions frequently occur at branching points, and leaf lesions appear on the leaf tissue. Early blight is a significant disease affecting tomatoes, and can infect both greenhouse and open-field cultivation. Severe infection can cause leaf and fruit drop, branch breakage, and yield reductions exceeding 30%. Besides tomatoes, this disease can also affect potatoes, eggplants, and peppers.

[0003] Carbon nitride can kill pathogens through local photothermal effects and the generation of reactive oxygen species. However, the conventional carbon nitride has an excessively fast electron-hole recombination rate, resulting in low photocatalytic efficiency and poor antibacterial effect. Summary of the Invention

[0004] Therefore, it is necessary to address the above problems by providing an oxygen-doped carbon nitride for antibacterial purposes, its preparation method, and its application. The oxygen-doped carbon nitride obtained by this preparation method has excellent photocatalytic activity and excellent inhibitory effect on pathogens.

[0005] A method for preparing oxygen-doped carbon nitride for antibacterial purposes includes the following steps:

[0006] Urea, melamine, oxygen source and solvent are mixed to form a supramolecular solid, wherein the mass ratio of urea, melamine and oxygen source is (2-5):(1-3):(0.5-4);

[0007] The supramolecular solid was calcined to obtain oxygen-doped carbon nitride, which had a morphology of nanosheets and an oxygen doping rate of 5%-60%.

[0008] In one embodiment, the mass ratio of the urea, the melamine and the oxygen source is (3-4):(1-2):(1-4).

[0009] In one embodiment, the mass ratio of urea to solvent is 2:50-5:70.

[0010] In one embodiment, the oxygen source is selected from ammonium oxalate;

[0011] And / or, the solvent is selected from water.

[0012] In one embodiment, urea, melamine, oxygen source and solvent are mixed and kept at 70°C-90°C for 8-10 hours to obtain the supramolecular solid.

[0013] In one embodiment, the calcination temperature of the supramolecular solid is 550°C-600°C, and the calcination time is 5h-6h.

[0014] In one embodiment, the heating rate in the step of calcining the supramolecular solid is 15°C / min to 25°C / min.

[0015] An oxygen-doped carbon nitride for antibacterial purposes, prepared by the method described above, wherein the oxygen-doped carbon nitride has a morphology of nanosheets and an oxygen doping rate of 5%-60%.

[0016] In one embodiment, the oxygen doping rate of the oxygen-doped carbon nitride is 20%-40%.

[0017] An oxygen-doped carbon nitride, as described above, is used as an antibacterial agent.

[0018] In the preparation method of oxygen-doped carbon nitride for antibacterial purposes of this invention, by selecting the type of precursor and controlling the mass ratio of precursor to oxygen source, and by regulating the preparation of a supramolecular solid intermediate state, oxygen-doped carbon nitride with a high degree of polymerization and a graphitic phase is obtained through synergistic effect. The morphology of the oxygen-doped carbon nitride is a regular nanosheet, and the oxygen doping rate is 5%-60%. This makes the oxygen-doped carbon nitride not only have the characteristics of graphitic phase carbon nitride, but also have excellent specific surface area and electron delocalization degree, thus having advantages such as excellent electron-hole pair transfer ability and carrier separation efficiency. In this way, the oxygen-doped carbon nitride has excellent photocatalytic activity and can effectively inhibit bacteria. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a scanning electron microscope image of oxygen-doped carbon nitride for antibacterial purposes obtained in Example 1.

[0021] Figure 2 The X-ray diffraction pattern of oxygen-doped carbon nitride for antibacterial purposes obtained in Example 1;

[0022] Figure 3 The diagram shows the pore size distribution, where L is the pore size distribution of oxygen-doped carbon nitride for antibacterial purposes obtained in Example 1, and M is the pore size distribution of carbon nitride obtained in Comparative Example 1.

[0023] Figure 4 Here are impedance test diagrams, where H is the impedance test diagram of oxygen-doped carbon nitride for antibacterial purposes obtained in Example 1, and G is the impedance test diagram of carbon nitride obtained in Comparative Example 1.

[0024] Figure 5 The figures are photocurrent test diagrams, where J is the photocurrent test diagram of oxygen-doped carbon nitride for antibacterial purposes obtained in Example 1, and K is the photocurrent test diagram of carbon nitride obtained in Comparative Example 1.

[0025] Figure 6 The images show the antibacterial activity of *Phytophthora infestans* in tomato under different light exposure times. A represents the antibacterial activity of PDA medium without additives under light exposure for 0 min, 15 min, 30 min, 45 min, and 60 min. B represents the antibacterial activity of carbon nitride obtained in Comparative Example 1 under light exposure for 0 min, 15 min, 30 min, 45 min, and 60 min. C represents the antibacterial activity of oxygen-doped carbon nitride obtained in Example 1 under light exposure for 0 min, 15 min, 30 min, 45 min, and 60 min. D represents the antibacterial activity of oxygen-doped carbon nitride obtained in Example 2 under light exposure for 0 min, 15 min, 30 min, 45 min, and 60 min. E represents the antibacterial activity of oxygen-doped carbon nitride obtained in Example 3 under light exposure for 0 min, 15 min, 30 min, 45 min, and 60 min. F represents the antibacterial activity of oxygen-doped carbon nitride obtained in Example 4 under light exposure for 0 min, 15 min, 30 min, 45 min, and 60 min. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more complete description will be given below with reference to relevant embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments or examples only and is not intended to limit the invention. The optional scope of the term "and / or" as used herein includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all related listed items.

[0028] This invention provides a method for preparing oxygen-doped carbon nitride for antibacterial purposes, comprising the following steps:

[0029] S1, urea, melamine, oxygen source and solvent are mixed to form a supramolecular solid, wherein the mass ratio of urea, melamine and oxygen source is (2-5):(1-3):(0.5-4);

[0030] S2, the supramolecular solid is calcined to obtain oxygen-doped carbon nitride, the morphology of the oxygen-doped carbon nitride is nanosheet, and the oxygen doping rate is 5%-60%.

[0031] In step S1, urea and melamine are used as precursors for carbon nitride. By selecting the type of precursor and controlling the mass ratio of precursor to oxygen source, urea and melamine are linked by ionic bonds to self-assemble into a supramolecular solid. Since both urea and melamine are compounds with triazine ring structures, the carbon nitride formed by self-assembling a supramolecular solid using urea and melamine as precursors and then polymerizing it has a high degree of polymerization.

[0032] In one embodiment, the oxygen source is selected from ammonium oxalate, and the solvent is selected from water, preferably pure water.

[0033] To better prepare a supramolecular solid, the preferred mass ratio of urea, melamine and oxygen source is (3-4):(1-2):(1-4).

[0034] In one embodiment, the mass ratio of urea to solvent is 2:50-5:70.

[0035] There are various methods for preparing a supramolecular solid by mixing urea, melamine, oxygen source, and solvent, and this invention does not limit this method. In one embodiment, the specific steps for preparing a supramolecular solid by mixing urea, melamine, oxygen source, and solvent are as follows: after mixing urea, melamine, oxygen source, and solvent, the mixture is kept at a temperature of 70℃-90℃ for 8-10 hours to obtain the supramolecular solid.

[0036] In step S2, urea and melamine in the supramolecular solid are calcined to polymerize and form carbon nitride with a regular nanosheet morphology. In addition, the oxygen source is decomposed into oxygen atoms during calcination and then doped into the carbon nitride to obtain oxygen-doped carbon nitride. At the same time, by controlling the mass ratio of urea, melamine and oxygen source, the oxygen doping rate in the oxygen-doped carbon nitride is controlled. Through the doping of oxygen atoms, the degree of electron delocalization of carbon nitride can be increased.

[0037] The above-described method for preparing oxygen-doped carbon nitride achieves several advantages. First, the resulting oxygen-doped carbon nitride possesses the characteristics of graphite-like carbon nitride. Its unique graphite layered structure and electronic structure give it advantages such as strong mechanical properties, good thermal stability, and resistance to acid and alkali corrosion. Second, the resulting carbon nitride exhibits a regular nanosheet morphology, resulting in an excellent specific surface area. Furthermore, the oxygen atoms doped within it give the carbon nitride an excellent degree of electron delocalization, leading to superior electron-hole pair transfer capabilities and carrier separation efficiency. Consequently, the oxygen-doped carbon nitride exhibits excellent photocatalytic activity and can effectively inhibit bacteria.

[0038] In order to make the calcination more complete, in one embodiment, the calcination temperature is 550℃-600℃ and the calcination time is 5h-6h.

[0039] In order to better incorporate oxygen atoms into carbon nitride, in one embodiment, the heating rate during the calcination of the supramolecular solid is 15°C / min-25°C / min.

[0040] The present invention also provides an oxygen-doped carbon nitride for antibacterial purposes, prepared by the method described above. The oxygen-doped carbon nitride has a nanosheet morphology and an oxygen doping rate of 5%-60%. At this time, the oxygen-doped carbon nitride has a regular nanosheet morphology and a specific oxygen doping rate, thus exhibiting excellent specific surface area and electron delocalization. As a result, the oxygen-doped carbon nitride has advantages such as excellent electron-hole pair transfer capability and carrier separation efficiency, thereby exhibiting excellent photocatalytic activity and effectively inhibiting bacteria.

[0041] For better antibacterial properties, the oxygen doping rate of the oxygen-doped carbon nitride is preferably 20%-40%.

[0042] Furthermore, the present invention can use oxygen-doped carbon nitride for antibacterial purposes as described above as an antibacterial agent. Since oxygen-doped carbon nitride for antibacterial purposes has excellent photocatalytic activity, it can effectively inhibit the growth of pathogens, and therefore has excellent antibacterial effect when used as an antibacterial agent.

[0043] The following specific examples will further illustrate the oxygen-doped carbon nitride for antibacterial purposes, its preparation method, and its application.

[0044] Example 1

[0045] 2.5g urea, 2.25g melamine, 0.25g ammonium oxalate and 60g pure water were mixed and stirred for 60min to obtain a mixture. The mixture was then kept at 80℃ for 8h to obtain a supramolecular solid.

[0046] The supramolecular solid obtained above was placed in a crucible, which was then calcined in a muffle furnace at a temperature of 550℃, a heating rate of 20℃ / min, and a calcination time of 6 h. After calcination, the mixture was cooled to obtain graphite-like oxygen-doped carbon nitride with a morphology of nanosheets, an oxygen doping rate of 5%, and a specific surface area of ​​10.95 m². 2 / g.

[0047] The scanning electron microscope image of oxygen-doped carbon nitride obtained in this embodiment is as follows: Figure 1 As shown, the well-structured nanosheets mean that the oxygen-doped carbon nitride obtained in this embodiment has superior electron-hole pair transfer capability and higher carrier separation efficiency.

[0048] The X-ray diffraction pattern of oxygen-doped carbon nitride obtained in this embodiment is as follows: Figure 2 As shown, by Figure 2 As can be seen, there are two obvious diffraction peaks in the X-ray diffraction pattern. One is a weak peak at 13.6°, which corresponds to the (100) crystal plane of graphitic carbon nitride. This peak indicates the periodic arrangement of heptaazine rings in the plane of graphitic carbon nitride. The second is an obvious diffraction peak at 27.1°, which corresponds to the (002) crystal plane of graphitic carbon nitride. This peak is formed by the accumulation of aromatic rings between planes in graphitic carbon nitride.

[0049] Example 2

[0050] 1.5g urea, 0.75g melamine, 0.25g ammonium oxalate and 60g pure water were mixed and stirred for 120min to obtain a mixture. The mixture was then kept at 70℃ for 8h to obtain a supramolecular solid.

[0051] The supramolecular solid obtained above was placed in a crucible, which was then placed in a muffle furnace for calcination at 600℃. The heating rate during calcination was 15℃ / min, and the calcination time was 5 h. After calcination, the mixture was cooled to obtain graphite-like oxygen-doped carbon nitride with a morphology of nanosheets, an oxygen doping rate of 10%, and a specific surface area of ​​11.73 m². 2 / g.

[0052] Example 3

[0053] 1.25g urea, 0.75g melamine, 0.5g ammonium oxalate and 60g pure water were mixed and stirred for 60 minutes to obtain a mixture. The mixture was then kept at 80℃ for 8 hours to obtain a supramolecular solid.

[0054] The supramolecular solid obtained above was placed in a crucible, which was then calcined in a muffle furnace at 550℃ with a heating rate of 20℃ / min for 6 hours. After calcination, the mixture was cooled to obtain graphite-like oxygen-doped carbon nitride with a nanosheet morphology, an oxygen doping rate of 20%, and a specific surface area of ​​11.23 m². 2 / g.

[0055] Example 4

[0056] 1.25g urea, 0.5g melamine, 0.75g ammonium oxalate and 60g pure water were mixed and stirred for 60 minutes to obtain a mixture. The mixture was then kept at 80℃ for 8 hours to obtain a supramolecular solid.

[0057] The supramolecular solid obtained above was placed in a crucible, which was then calcined in a muffle furnace at a temperature of 550℃, a heating rate of 20℃ / min, and a calcination time of 6 h. After calcination, the mixture was cooled to obtain oxygen-doped carbon nitride with a graphite-like phase morphology of nanosheets, an oxygen doping rate of 30%, and a specific surface area of ​​12.06 m². 2 / g.

[0058] Example 5

[0059] 1g of urea, 0.5g of melamine, 1g of ammonium oxalate and 60g of pure water were mixed and stirred for 60 minutes to obtain a mixture. The mixture was then kept at 80℃ for 8 hours to obtain a supramolecular solid.

[0060] The supramolecular solid obtained above was placed in a crucible, which was then calcined in a muffle furnace at a temperature of 550℃, a heating rate of 20℃ / min, and a calcination time of 6 h. After calcination, the mixture was cooled to obtain oxygen-doped carbon nitride with a graphite-like phase morphology of nanosheets, an oxygen doping rate of 40%, and a specific surface area of ​​12.78 m². 2 / g.

[0061] Example 6

[0062] 2g of urea, 1g of melamine, 4g of ammonium chloride and 60g of pure water were mixed and stirred for 60 minutes to obtain a mixture. The mixture was then kept at 90℃ for 10 hours to obtain a supramolecular solid.

[0063] The supramolecular solid obtained above was placed in a crucible, which was then placed in a muffle furnace for calcination at 550℃. The heating rate during calcination was 25℃ / min, and the calcination time was 6 hours. After calcination, the mixture was cooled to obtain graphite-like oxygen-doped carbon nitride with a nanosheet morphology, an oxygen doping rate of 60%, and a specific surface area of ​​13.06 m². 2 / g.

[0064] Comparative Example 1

[0065] 2.5g of urea, 2.25g of melamine and 60g of pure water were mixed and stirred for 60 minutes to obtain a mixture. The mixture was then kept at 80℃ for 8 hours to obtain a supramolecular solid.

[0066] The supramolecular solid obtained above was placed in a crucible, which was then placed in a muffle furnace for calcination at 550℃. The heating rate during calcination was 20℃ / min, and the calcination time was 6 hours. After calcination, the solid was cooled to obtain a specific surface area of ​​9.89 m². 2 / g of carbon nitride.

[0067] A comparison of the pore size distribution of oxygen-doped carbon nitride obtained in Example 1 and carbon nitride obtained in Comparative Example 1 is shown in the figure below. Figure 3 As shown, by Figure 3 It can be seen that the oxygen-doped carbon nitride obtained in Example 1 has a larger pore size than the carbon nitride obtained in Comparative Example 1, thus having a larger specific surface area.

[0068] The impedance test diagrams of oxygen-doped carbon nitride obtained in Example 1 and carbon nitride obtained in Comparative Example 1 are shown below. Figure 4 As shown, by Figure 4 As can be seen, the oxygen-doped carbon nitride obtained in Example 1 has the lowest impedance and therefore has excellent electron-hole separation efficiency.

[0069] The photocurrent test patterns of oxygen-doped carbon nitride obtained in Example 1 and carbon nitride obtained in Comparative Example 1 are shown below. Figure 5 As shown, by Figure 5 It can be seen that the oxygen-doped carbon nitride obtained in Example 1 has the largest photocurrent, and therefore has excellent electron-hole separation efficiency.

[0070] Comparative Example 2

[0071] 1g of dicyandiamide, 0.5g of cyanuric acid, 1g of ammonium oxalate and 60g of pure water were mixed and stirred for 60 minutes to obtain a mixture. The mixture was then kept at 80℃ for 8 hours to obtain a supramolecular solid.

[0072] The supramolecular solid obtained above was placed in a crucible, which was then placed in a muffle furnace for calcination at 550℃. The heating rate during calcination was 20℃ / min, and the calcination time was 6 hours. After calcination, the mixture was cooled to obtain oxygen-doped carbon nitride with an oxygen doping rate of 40% and a specific surface area of ​​11.34 m². 2 / g.

[0073] Comparative Example 3

[0074] 0.5g urea, 0.25g melamine, 1.75g ​​ammonium oxalate and 60g pure water were mixed and stirred for 60min to obtain a mixture. The mixture was then kept at 80℃ for 8h to obtain a supramolecular solid.

[0075] The supramolecular solid obtained above was placed in a crucible, which was then placed in a muffle furnace for calcination at 550℃. The heating rate during calcination was 20℃ / min, and the calcination time was 6 hours. After calcination, the mixture was cooled to obtain oxygen-doped carbon nitride with an oxygen doping rate of 70% and a specific surface area of ​​13.58 m². 2 / g.

[0076] Comparative Example 4

[0077] Mix 1g of urea, 0.5g of melamine, 1g of ammonium oxalate and 60g of pure water and stir for 10 minutes to obtain a mixture. Then keep the mixture at 60℃ for 5 hours.

[0078] The above-mentioned heat-preserved mixture was placed in a crucible, and then the crucible was placed in a muffle furnace for calcination at 550℃. The heating rate during calcination was 20℃ / min, and the calcination time was 6 hours. After calcination, the mixture was cooled to obtain oxygen-doped carbon nitride with an oxygen doping rate of 40% and a specific surface area of ​​12.29 m². 2 / g.

[0079] Test Example 1

[0080] The oxygen-doped carbon nitride obtained in Examples 1-4 and the carbon nitride obtained in Comparative Example 1 were subjected to photocatalytic antibacterial experiments. The specific process is as follows:

[0081] Carbon nitride obtained in Comparative Example 1 and oxygen-doped carbon nitride obtained in Examples 1-4 were used as additives and dispersed in PDA (potato dextrose agar) medium (additive concentration: 0.1 mg / mL) by ultrasound to prepare solutions. *Phytophthora indicum* was inoculated into both PDA medium without additives and the aforementioned PDA medium with additives. Irradiation was performed using a xenon lamp with a 420 nm spectrum and a power of 300 W, equipped with a filter. The illumination times for each group were 0 min, 15 min, 30 min, 45 min, and 60 min, respectively. After illumination, the medium was placed in an incubator at a controlled temperature of 26 °C. Mycelial growth was observed and recorded after 3 days of incubation.

[0082] Mycelial growth as follows Figure 6 As shown in the figure, after 3 days, in the PDA medium without additives, the mycelia completely filled the medium regardless of whether there was light exposure. In the PDA medium with added carbon nitride, the mycelia completely filled the medium without light exposure, and the mycelial growth slowed down slightly after light exposure, but the slowdown was slow. In the medium with oxygen-doped carbon nitride, the mycelia still completely filled the medium without light exposure, but the mycelial growth slowed down significantly after light exposure, and the inhibitory effect on mycelia was better when the light exposure time was 60 min. This indicates that oxygen doping can enhance the photocatalytic activity of carbon nitride, and the oxygen-doped carbon nitride with an oxygen doping rate of 30% completely inhibited mycelial growth after a light exposure time of 15 min. Therefore, the oxygen-doped carbon nitride with an oxygen doping rate of 30% had the best inhibitory effect on bacterial growth.

[0083] The oxygen-doped carbon nitride obtained in Examples 1-6, the carbon nitride obtained in Comparative Example 1, and the oxygen-doped carbon nitride obtained in Comparative Examples 2-4 were used as additives to conduct antibacterial experiments against *Early Leaf Spotter* of tomato using the above method. The light exposure time was 45 min, and the inhibition rate was tested after 3 days of growth. The test method is as follows, and the test results are shown in Table 1:

[0084] Inhibition rate (%) = (Coronavirus diameter of control group - Coronavirus diameter of treatment group) / (Coronavirus diameter of control group - Diameter of bacterial cake) × 100%. The control group was PDA medium without additives, and the treatment group was PDA medium with oxygen-doped carbon nitride obtained in Examples 1-6, carbon nitride obtained in Comparative Example 1, and oxygen-doped carbon nitride obtained in Comparative Examples 2-4, respectively.

[0085] Table 1

[0086] Antibacterial rate (%) Example 1 77.73 Example 2 80.26 Example 3 93.58 Example 4 100 Example 5 100 Example 6 95.49 Comparative Example 1 46.35 Comparative Example 2 66.28 Comparative Example 3 72.63 Comparative Example 4 70.26

[0087] As shown in Table 1, the oxygen-doped carbon nitride of the present invention achieves a 100% antibacterial rate. Furthermore, based on the examples and comparative examples, the oxygen doping rate of the oxygen-doped carbon nitride of the present invention, ranging from 5% to 60%, exhibits excellent antibacterial effects against *Phytophthora indicum*, with even better antibacterial effects observed at an oxygen doping rate of 20% to 40%. Therefore, the oxygen-doped carbon nitride of the present invention possesses highly efficient antibacterial effects.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for preparing oxygen-doped carbon nitride for antibacterial purposes, characterized in that, Includes the following steps: Urea, melamine, oxygen source and solvent are mixed and kept at 70℃-90℃ for 8h-10h to prepare supramolecular solid. The mass ratio of urea, melamine and oxygen source is (2-5):(1-3):(0.5-4). The oxygen source is selected from ammonium oxalate. The supramolecular solid was calcined to obtain oxygen-doped carbon nitride, which has a morphology of nanosheets and an oxygen doping rate of 5%-60%.

2. The method for preparing oxygen-doped carbon nitride for antibacterial purposes according to claim 1, characterized in that, The mass ratio of the urea, the melamine and the oxygen source is (3-4):(1-2):(1-4).

3. The method for preparing oxygen-doped carbon nitride for antibacterial purposes according to claim 1 or 2, characterized in that, The mass ratio of urea to solvent is 2:50-5:

70.

4. The method for preparing oxygen-doped carbon nitride for antibacterial purposes according to claim 1 or 2, characterized in that, The solvent is selected from water.

5. The method for preparing oxygen-doped carbon nitride for antibacterial purposes according to claim 1 or 2, characterized in that, In the step of calcining the supramolecular solid, the calcination temperature is 550℃-600℃ and the calcination time is 5h-6h.

6. The method for preparing oxygen-doped carbon nitride for antibacterial purposes according to claim 5, characterized in that, In the step of calcining the supramolecular solid, the heating rate is 15℃ / min-25℃ / min.

7. An oxygen-doped carbon nitride for antibacterial purposes, obtained by the preparation method according to any one of claims 1-6, characterized in that, The oxygen-doped carbon nitride has a morphology of nanosheets and an oxygen doping rate of 5%-60%.

8. The oxygen-doped carbon nitride for antibacterial purposes according to claim 7, characterized in that, The oxygen doping rate of the oxygen-doped carbon nitride is 20%-40%.

9. Use of oxygen-doped carbon nitride for antibacterial purposes as described in claim 7 or 8 in the preparation of antibacterial agents.

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