Application of cobalt monatomic doped strontium titanate composite catalytic material in activated peracetic acid catalytic degradation of organic pollutants

Abstract

The invention discloses a preparation method and application of a cobalt monatomic doped strontium titanate composite material, and belongs to the field of water treatment. The cobalt-doped strontium titanate composite catalytic material disclosed by the invention is formed by compounding a cobalt metal-doped strontium titanate material. According to the preparation process, tetrabutyl titanate and nitrate are used as reactants, ethylene glycol and water are used as solvents, and strontium titanate (SrTiO3: STO) is prepared through a hydrothermal method. Then, doping cobalt single atoms into strontium titanate through cobalt chloride (a cobalt source) by using an electrostatic adsorption method to form cobalt-doped strontium titanate (Co-STO); the material can efficiently activate an oxidizing agent peracetic acid and rapidly degrade various antibiotic pollutants, and especially has excellent performance in the aspect of degrading quinolones, tetracyclines and macrolide antibiotics. The catalytic material has the advantages of low cost, reproducibility, environmental protection and the like, and is very suitable for the advanced treatment process of pharmaceutical wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to application of a cobalt single atom doped strontium titanate composite catalytic material in catalytic degradation of organic pollutants by activated peracetic acid. Background Art

[0002] In recent years, Fenton-like catalytic reactions have attracted widespread attention due to their excellent performance in the degradation of organic pollutants. The Fenton reaction relies on iron ions to catalyze the decomposition of hydrogen peroxide (H2O2) to generate hydroxyl radicals (·OH), which have extremely strong oxidizing ability and can quickly and effectively degrade organic pollutants in water. However, the traditional Fenton reaction has some prominent defects in practical applications, such as rapid deactivation of the catalyst, harsh reaction conditions, and secondary pollution that may be caused by the iron source. These problems limit its promotion and use in a wider range of application scenarios.

[0003] To overcome these challenges, researchers have gradually turned their attention to Fenton-like reaction systems, exploring different metal ions or metal-based catalysts to activate peroxides, such as hydrogen peroxide (H2O2), persulfate (PMS) and peracetic acid (PAA). Among them, peracetic acid has good adaptability in treating a variety of organic pollutants due to its high oxidation ability and excellent stability. By designing and synthesizing new catalytic materials, efficient activation of peracetic acid can be achieved, thereby generating active species to quickly degrade a variety of antibiotics and other organic pollutants in water.

[0004] Among many catalytic materials, strontium titanate oxide (ABO3) has received great attention in the field of materials science and heterogeneous catalysis in recent years due to its flexible chemical composition, element abundance, rich electronic structure and high thermal stability. In this type of material, the B-site cation is usually a transition metal with an incompletely filled 3d orbital, so the B site can not only participate in the catalytic reaction, but also be the active site of the redox reaction. It can be seen that the potential of strontium titanate materials as catalytic substrate materials is very huge. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an application of a cobalt single atom doped strontium titanate composite catalytic material in the activation of peracetic acid to catalyze the degradation of organic pollutants. The cobalt-doped strontium titanate composite material proposed by the present invention is based on the above concept and provides a new and effective solution for removing organic pollutants by efficiently activating peracetic acid. This research and development achievement provides new ideas and perspectives for further developing and optimizing water treatment technology, and helps to cope with the current challenges in environmental protection.

[0006] The purpose of the present invention is to provide a cobalt single atom doped strontium titanate composite catalytic material for use in activating peracetic acid to catalyze the degradation of organic pollutants; the cobalt single atom doped strontium titanate composite catalytic material comprises a strontium titanate crystal and a cobalt single atom embedded in the strontium titanate crystal structure.

[0007] In some embodiments of the present invention, the average diameter of the cobalt single atom doped strontium titanate composite catalytic material is 30 to 200 nm; The loading amount of cobalt single atoms in the cobalt single atom doped strontium titanate composite catalytic material is 0.5 wt%-6.0wt%. For example, it can be 0.5wt%, 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, 3.0wt%, 3.5wt%, 4.0wt%, 4.5wt%, 5.0wt%, 5.5wt%, 6.0wt%, etc., or any interval value between any two values.

[0008] In some embodiments of the present invention, the organic pollutants include antibiotic pollutants.

[0009] In some embodiments of the present invention, the antibiotic pollutants include one or more of macrolides, cephalosporins, sulfonamides, tetracyclines and quinolones.

[0010] Furthermore, the macrolides include azithromycin (AZI), roxithromycin, erythromycin, clarithromycin, etc.; The cephalosporins include cefoperazone, cephradine, and ceftazidime; The sulfonamides include sulfacetamide (SCT), sulfisoxazole (SIZ), sulfamethoxazole, etc.; The tetracyclines include tetracycline (TC), oxytetracycline (OTC), chlortetracycline, doxycycline, etc.; The quinolones include norfloxacin (NOF), gatifloxacin (GAT), moxifloxacin (MOX), ciprofloxacin (CIP) and the like.

[0011] In some embodiments of the present invention, the pH of the catalytically degraded organic pollutant solution is 1-11. For example, it can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc., or any interval value between any two values; further, the pH can also be 3-9, 3-7, 3-5, 5-9, etc.

[0012] In some embodiments of the present invention, the cobalt single atom doped strontium titanate composite catalytic material is prepared by the following method: (1) adding a titanium source, nitrate and sodium hydroxide to a mixed solvent to obtain a mixed solution, heating the mixed solution for hydrothermal reaction, and after the reaction is completed, performing solid-liquid separation to obtain a solid phase product, i.e., a strontium titanate composite material; (2) Dispersing the strontium titanate composite material obtained in step (1) in a water-ethylene glycol mixture, adding a cobalt source solution, and obtaining the cobalt single atom doped strontium titanate composite catalytic material.

[0013] In some embodiments of the present invention, in step (1), the titanium source is selected from tetrabutyl titanate.

[0014] In some embodiments of the present invention, in step (1), the nitrate comprises one or more of barium nitrate, strontium nitrate and lead nitrate; The mixed solvent includes ethylene glycol and water; the volume ratio of ethylene glycol to water is (1:1) to (2:1); The concentration of the sodium hydroxide is 1-10 mmol / L.

[0015] In some embodiments of the present invention, in step (1), the hydrothermal reaction conditions are: temperature of 180-210°C, time of 12-24 h; illustratively, the temperature is 180°C, 190°C, 200°C, 210°C, etc., or any interval value between any two values; illustratively, the time can be 12h, 15h, 18h, 20h, 21h, 22h, 23h, 24h, etc., or any interval value between any two values.

[0016] In some embodiments of the present invention, in step (2), the cobalt source in the cobalt source solution is selected from one or more of cobalt chloride, cobalt nitrate, and cobalt acetylacetonate; The volume ratio of water to ethylene glycol in water-ethylene glycol is 9:1.

[0017] The above technical solution of the present invention has the following advantages compared with the prior art: The present invention can obtain a nanosheet catalytic substrate material with a specific morphology by controlling the reaction conditions, thereby improving the catalytic performance. As a transition metal catalyst, cobalt metal ions have shown good application potential in the field of water treatment due to their good catalytic performance and economy.

[0018] The synthesis methods of the composite materials of the present invention are all completed by hydrothermal method, which has the characteristics of low cost, no pollution, simple operation, etc., and is suitable for large-scale production. Compared with traditional catalysts, the cobalt single-atom strontium titanate catalytic material uses strontium titanate as a supporting material and loads cobalt single atoms on its surface. The obtained material has a higher Fenton-like catalytic activity on its surface and avoids the disadvantage that single atoms are easy to agglomerate. The prepared composite catalyst has more active sites and stronger mechanical strength, and can be widely used in industries such as wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 This is a SEM image of the cobalt single atom doped strontium titanate composite catalytic material prepared in Example 1.

[0020] Figure 2 This is a TEM image of the cobalt single atom doped strontium titanate composite catalytic material prepared in Example 1.

[0021] Figure 3 This is the activity data diagram of the strontium titanate catalytic material and the cobalt single atom doped strontium titanate catalytic material in Experimental Example 1 for degrading ciprofloxacin (CIP).

[0022] Figure 4 is the kinetic constant of the reaction of PAA to ciprofloxacin activated by the cobalt single atom doped strontium titanate composite catalytic material in Experimental Example 1.

[0023] Figure 5 This is a data chart of the degradation of ciprofloxacin by the cobalt single atom doped strontium titanate composite catalytic material under different catalytic conditions in Experimental Example 3.

[0024] Figure 6 This is a graph showing the degradation data of the cobalt single atom-doped strontium titanate composite catalytic material activated at different pH values ​​in Experimental Example 3.

[0025] Figure 7 This is the activity diagram of the degradation of ciprofloxacin by activating PAA in the presence of different ions in Experimental Example 4 using the cobalt single atom doped strontium titanate composite catalytic material.

[0026] Figure 8 This is a diagram showing the catalytic removal effect of different organic pollutants by activating PAA with cobalt single atom-doped strontium titanate composite catalytic material in Experimental Example 5. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] Example 1 This embodiment provides a preparation method and application of a cobalt single atom doped strontium titanate composite catalytic material 1. Preparation of materials: (1) Taking strontium titanate nanosheets as an example: 10 mM tetrabutyl titanate (CH3CH2CH2CH2O)4Ti) was added to 40 ml ethylene glycol and stirred at room temperature for 60 min to obtain a tetrabutyl titanate solution.

[0029] (2) Add 20 mL of 0.5 M strontium nitrate (Sr(NO3)2) solution to the tetrabutyl titanate solution of step (1) under stirring to obtain a mixed solution 1.

[0030] (3) Add 10 mL of 5 M NaOH solution to the mixed solution in step (2), stir until a clear solution is obtained, and stir for 40 min to obtain a mixed solution 2.

[0031] (4) The obtained mixed solution 2 was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel autoclave and hydrothermaled at 200 °C for 24 h. The obtained product was washed with deionized water (DI) several times until neutral, washed with ethanol several times, and vacuum dried to obtain a strontium titanate substrate material (STO-OV).

[0032] (5) 0.2 g of the strontium titanate substrate material obtained in step (4) was placed in a mixture of ethylene glycol and water (volume ratio of 9:1), and ultrasonicated for 40 min. Then, 4.0 wt% (relative to 0.2 g strontium titanate) of cobalt chloride solution containing Co ions was added, and stirred at 60 °C for 10 h. The reaction solution was subjected to solid-liquid separation, and the obtained solid product was washed and dried to obtain a green sample, which was the synthesized cobalt single atom doped strontium titanate (4.0 wt% Co-STO) composite nanomaterial.

[0033] Comparison group 1 This comparison group provides a strontium titanate material STO-OV containing internal oxygen defects.

[0034] Comparison group 2 This comparative group provides a strontium titanate material with internal oxygen defects removed Preparation method: 0.2 g of STO-Ov was placed in a muffle furnace at 400 °C for 4 h. It was then washed with deionized water and anhydrous ethanol for more than three times, dried under vacuum, and the product was named STO.

[0035] 2. Material application: Study on the activation of PAA to degrade ciprofloxacin (CIP) by using STO-OV obtained in comparison group 1, strontium titanate STO obtained in comparison group 2, and cobalt single atom doped strontium titanate Co-STO composite nanomaterials obtained in Example 1. The specific steps are as follows: 1. The concentration of ciprofloxacin is 0.05 mM. Take 100 mL of the solution and place it in a beaker. Add 0.1 mM peracetic acid PAA solution and adjust to pH = 5.0 with HCl or NaOH. Place the reactor with the above beaker at room temperature. The reaction temperature is 25 °C. Add 10 mg of STO material, STO-OV material, and Co-STO nanomaterial and mix them evenly. Then, take 1 ml of the reaction solution at regular intervals. After the reaction, separate the reaction system with a 0.22 um filter membrane. Use high performance liquid chromatography to determine the concentration of ciprofloxacin in the solution, and calculate the removal rate of ciprofloxacin by different catalysts. The experimental results are shown in Figure 3-4 .

[0036] The present invention first selected quinolone antibiotic pollutants as model pollutants, and here the application of removing the antibiotic ciprofloxacin (CIP) was selected first. Ciprofloxacin is a widely used antibiotic, and its residue in the environment may cause the problem of antibiotic resistance, so it is of great significance to efficiently remove this pollutant. The present invention successfully synthesized three different strontium titanate-based catalytic materials: strontium titanate (STO material) in comparison group 1, strontium titanate with oxygen defects (STO-Ov material) in comparison group 2, and cobalt single atom doped strontium titanate composite nanomaterial (Co-STO nanomaterial) in Example 1.

[0037] Depend on Figure 3 It can be seen that after 5 minutes of reaction, the Co-STO nanomaterials showed extremely efficient removal ability, with a removal rate of more than 98%. This is in sharp contrast to the STO material and STO-Ov material, the removal rates of the latter two are less than 20%, showing a significant performance difference.

[0038] From the perspective of reaction kinetics ( Figure 4 ), the reaction kinetic constant k of Co-STO nanomaterials reached 0.59 min⁻¹, which indicates that its reaction speed is fast, which is 21.07 times that of STO materials (0.028 min⁻¹) and 9.08 times that of STO-Ov materials (0.065 min⁻¹). These differences in reaction rate constants clearly show the significant effect of cobalt doping, which greatly improves the catalytic activity, especially in the activation of peracetic acid, which undoubtedly enhances the overall performance and practical value of the catalyst. The presence of cobalt not only improves the electronic structure and surface properties of the material, increases the number and types of active sites, but also may enhance the catalytic efficiency by introducing new reaction mechanisms. At the same time, it is proposed that it has great potential in practical water treatment applications and promotes the development of environmentally friendly catalytic technology.

[0039] Experimental Example 2 Material application: Degradation of ciprofloxacin by cobalt single atom doped strontium titanate composite catalytic material under different reaction conditions Reaction condition 1: The concentration of ciprofloxacin is 5 μM. Take 100 mL of the solution and place it in a beaker. Add PAA solution (final concentration is 0.1 mM) and adjust the pH to 5.0 using HCl or NaOH. Place the reactor at room temperature and the reaction temperature is 25 °C.

[0040] Reaction condition 2: The concentration of ciprofloxacin is 10 μM. Take 100 mL of the solution and place it in a beaker. Add PAA solution (concentration is 0.1 mM) and adjust the pH to 5.0 using HCl or NaOH. Place the reactor at room temperature and the reaction temperature is 25 °C.

[0041] Reaction condition 3: The concentration of ciprofloxacin is 10 mM. Take 100 mL of the solution and place it in a beaker. Add PAA solution (concentration is 0.05 mM) and adjust the pH to 5.0 using HCl or NaOH. Place the reactor at room temperature and the reaction temperature is 25 °C.

[0042] Under the above three reaction conditions, 10 mg of 4.0 wt% Co-STO nanomaterials were added and mixed evenly. Then, 1 ml of the reaction solution was taken at regular intervals. After the reaction, the reaction system was separated using a 0.22 um filter membrane. The concentration of ciprofloxacin in the solution was determined using high performance liquid chromatography, and the removal rate of ciprofloxacin by different catalysts was calculated.

[0043] Specific as Figure 5 As shown in the figure, the experimental results show that 4.0 wt% Co-STO nanomaterials exhibited excellent removal capabilities under all three reaction conditions. After 10 minutes of experiment, any of the reaction conditions achieved a removal rate of more than 80%. It is particularly noteworthy that under reaction condition 1, the catalyst achieved a 98.7% degradation rate of ciprofloxacin in just 5 minutes, which is a very meaningful discovery and demonstrates its great potential in efficient water treatment applications.

[0044] Experimental Example 3 Material application: Degradation performance of ciprofloxacin by cobalt single atom doped strontium titanate composite catalytic material activated by PAA at different pH The concentration of ciprofloxacin was 0.05 mM. 100 mL of the solution was placed in a beaker, and PAA solution (concentration was 0.1 mM) was added. The pH was adjusted to 1.0, 3.0, 5.0, 7.0, 9.0 and 11.0 using HCl or NaOH. The reactor was placed at room temperature, the reaction temperature was 25 °C, and 10 mg of Co-STO composite nanomaterials were added and mixed evenly. Subsequently, 1 ml of the reaction solution was taken at regular intervals. After the reaction was completed, the reaction system was separated using a 0.22 um filter membrane. The concentration of ciprofloxacin in the solution was determined using high performance liquid chromatography, and the removal rate of ciprofloxacin by different catalysts was calculated.

[0045] As the pH value increases from 1.0 to 5.0, the degradation of ciprofloxacin by 4.0 wt% Co-STO nanomaterials gradually increases; it is worth noting that the degradation capacity between pH 5.0-7.0 can reach 99.0% within 5 min; when pH>7.0, the degradation of ciprofloxacin begins to decrease. Figure 6 As shown, it can be seen that the Co-STO nanomaterial of the present invention is most suitable for sewage and wastewater treatment processes within the pH range of 3 to 9.

[0046] Experimental Example 4 Material application: Degradation performance of ciprofloxacin by PAA activated by cobalt single atom doped strontium titanate at different external ionic strengths The concentration of ciprofloxacin was 0.05 mM. 100 mL of the solution was placed in a beaker, and PAA solution (concentration was 0.1 mM) was added, followed by bicarbonate ions (HCO3 - :1 mM)、Cl - :1 mM)、phosphate ion(PO4 2- :1mM)、nitrate ion(NO3 - : 1 mM) and humic acid (HA: 100 ppm) and other substances. Use HCl or NaOH to adjust to pH = 5.0, place the reactor at room temperature, the reaction temperature is 25 ℃, and add 10 mg of Co-STO nanomaterials and mix them evenly. Then, take 1 ml of the reaction solution at regular intervals. After the reaction, use a 0.22 um filter membrane to separate the reaction system. Use high-performance liquid chromatography to determine the concentration of ciprofloxacin in the solution, and calculate the removal rate of ciprofloxacin by different catalysts. The experimental results are shown in Figure 7 .

[0047] Figure 7 The degradation ability of PAA activated by cobalt single atom doped strontium titanate composite catalytic material is shown. - , HA and NO3 -etc. have almost no effect on the degradation of the material and can be ignored, especially Cl - Under the conditions of , not only did the activation of PAA not inhibited, but the degradation capacity was increased, that is, the degradation capacity reached 98% within 3 minutes, which may be the reason for the generation of Cl free radicals. In summary, the cobalt single atom doped strontium titanate catalytic material of the present invention has good resistance to coexisting ions in water, and can activate PAA to degrade more target organic pollutants under the condition of the presence of ions, proving that the material involved in the present invention will have better practical application prospects.

[0048] Experimental Example 5 Material application: Performance test of the Co single atom-doped strontium titanate composite catalytic material prepared in Example 1 for degradation and removal of multiple antibiotics In this experiment, a variety of common antibiotics were selected as representative contaminants for testing. These antibiotics cover several common drug classes: azithromycin (AZI) represents macrolides, cefadroxil (CFR) represents cephalosporins, sulfacetamide (SCT) and sulfisoxazole (SIZ) represent sulfonamides, tetracycline (TC) and oxytetracycline (OTC) represent tetracyclines, and norfloxacin (NOF), gatifloxacin (GAT), and moxifloxacin (MOX) represent quinolones.

[0049] The experiment adopted the same experimental method as Example 1 to ensure the comparability of the results, that is, the degradation test was carried out under standardized conditions, and the reaction time was uniformly set to 5 minutes. The experimental results showed that the catalytic material exhibited extremely high removal efficiency for the above-mentioned multiple antibiotics in just 5 minutes. Specifically, except for cefadroxil, the removal rates of the other antibiotics exceeded 98%. Although cefadroxil performed slightly worse, its removal rate also reached 80%, which shows that even when faced with pollutants with more complex structures or more difficult to degrade, Co-STO nanomaterials still have strong catalytic capabilities.

[0050] These results fully demonstrate the significant potential of 4.0 wt% Co-STO nanomaterials in removing complex chemical pollutants from water ( Figure 8 ). In particular, the high efficiency of degradation in such a short reaction time highlights its value in practical water treatment applications. In the future, by further optimizing the structure of the material and the reaction conditions, it can be expected that this catalyst will show more advantages in treating a wider range of pollutants. This research provides new ideas for the development of water treatment technology and possible solutions to challenges in the field of environmental protection.

[0051] Comparative Example 1 In step (6) of Example 1, the cobalt chloride solution containing the cobalt source is replaced with other metal solutions, including an iron-containing ferric chloride solution (FeCl3), a copper-containing cupric chloride solution (CuCl2), and a nickel-containing nickel chloride solution (NiCl2). After stirring these solutions at 60 °C for 10 hours, iron-doped strontium titanate (Fe-STO), copper-doped strontium titanate (Cu-STO), and nickel-doped strontium titanate (Ni-STO) materials were successfully prepared. However, its degradation efficiency is significantly lower than that of Co-STO. Specifically, their reaction kinetic constants are: 0.31 min⁻¹ for Fe-STO material, 0.23 min⁻¹ for Cu-STO material, and 0.35 min⁻¹ for Ni-STO material. -1 This indicates that Co as a single-atom doped material plays an irreplaceable role in improving the catalytic activity of Co-STO nanomaterials.

[0052] Comparative Example 2 Further experiments also tried to change the solvent type and synthesis conditions. When ethanol was used instead of ethylene glycol as a solvent, the catalytic performance of the Co-STO nanomaterial decreased, and the degradation efficiency dropped to 90% within 5 minutes. At the same time, when the temperature of the hydrothermal synthesis was reduced to 100 ° C, the material yield decreased by 40.2%, and the degradation efficiency dropped to 85% within 5 minutes. This may be related to the reduction in the crystallinity of the material, indicating that the lower synthesis temperature may have a negative impact on the crystal structure of the material, thereby affecting its catalytic performance.

[0053] Comparative Example 3 In this comparative example, when peracetic acid (PAA) was not added during the reaction, the study observed that the Co-STO nanomaterial had almost no degradation ability for ciprofloxacin, and only 15.2% removal was achieved. This further emphasizes the importance of PAA as a synergistic catalyst, which significantly improved the degradation ability of the Co-STO nanomaterial in the reaction.

[0054] Comparative Example 4 In this set of comparative experiments, different synthetic methods were explored to prepare various forms of strontium titanate (STO materials), including nanorods and nanoparticles, to evaluate the effect of material morphology on catalytic performance. In the experiment, these different forms of STO materials were doped with single cobalt atoms to become Co-STO nanomaterials. The experimental results show that these morphological changes do not seem to have a significant effect on the degradation ability of Co-STO catalytic materials, whether in the form of nanorods or nanoparticles. Experimental data show that within a reaction time of 5 minutes, these different forms of Co-STO nanomaterials all achieved a removal rate of more than 95% for ciprofloxacin. These results show that although materials of different forms may have unique physicochemical properties in specific applications, single-atom doping of cobalt seems to play a more critical role in catalytic performance, beyond the influence of morphological differences. This finding emphasizes the central role of active sites in cobalt doping in the catalytic process, regardless of the form in which they are presented. This phenomenon not only broadens the potential synthesis pathways for such materials, but also provides greater flexibility in the selection of material morphology for specific applications.

[0055] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. An application of a cobalt single atom doped strontium titanate composite catalytic material in catalytic degradation of organic pollutants by activated peracetic acid; the cobalt single atom doped strontium titanate composite catalytic material comprises a strontium titanate crystal and a cobalt single atom embedded in the strontium titanate crystal structure.

2. The use according to claim 1, characterized in that: The average diameter of the cobalt single atom doped strontium titanate composite catalytic material is 30 to 200 nm; The loading amount of cobalt single atoms in the cobalt single atom-doped strontium titanate composite catalytic material is 0.5 wt%-6.0 wt%.

3. The use according to claim 1, characterized in that: The organic pollutants include antibiotic pollutants or endocrine disruptors.

4. The use according to claim 3, characterized in that: The antibiotic pollutants include one or more of macrolides, cephalosporins, sulfonamides, tetracyclines and quinolones.

5. The use according to claim 1, characterized in that: The pH of the organic pollutant solution for catalytic degradation is 1~11.

6. The use according to claim 1, characterized in that: The cobalt single atom doped strontium titanate composite catalytic material is prepared by the following method: (1) adding a titanium source, nitrate and sodium hydroxide to a mixed solvent to obtain a mixed solution, heating the mixed solution for hydrothermal reaction, and after the reaction is completed, performing solid-liquid separation to obtain a solid phase product, i.e., a strontium titanate composite material; (2) Dispersing the strontium titanate composite material obtained in step (1) in a water-ethylene glycol mixture, adding a cobalt source solution, and obtaining the cobalt single atom doped strontium titanate composite catalytic material.

7. The use according to claim 6, characterized in that: In step (1), the titanium source is selected from tetrabutyl titanate.

8. The use according to claim 6, characterized in that: In step (1), the nitrate includes one or more of barium nitrate, strontium nitrate and lead nitrate; The mixed solvent includes ethylene glycol and water; the volume ratio of ethylene glycol to water is (1:1) to (2:1); The concentration of the sodium hydroxide is 1-10 mmol / L.

9. The use according to claim 6, characterized in that: In step (1), the hydrothermal reaction conditions are: temperature of 180-210°C and time of 12-24 h.

10. The use according to claim 6, characterized in that: In step (2), the cobalt source in the cobalt source solution may be selected from one or more of cobalt chloride, cobalt nitrate, and cobalt acetylacetonate; The volume ratio of water to ethylene glycol in water-ethylene glycol is 9:1.

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