High-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater and preparation method of high-activity nitrogen-doped catalyst
By preparing a highly active nitrogen-doped catalyst, the problem of difficult degradation of chemical organic wastewater was solved, and efficient and rapid degradation of organic pollutants was achieved. The catalyst has a porous structure and good stability, and is suitable for treating organic wastewater such as dyes and antibiotics.
Patent Information
- Application Number
- CN202511210357.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2025-11-21
AI Technical Summary
Existing technologies are insufficient for efficiently degrading chemical organic wastewater, especially dyes and antibiotics. Traditional methods pose a risk of secondary pollution and have low treatment efficiency.
By preparing a highly active nitrogen-doped catalyst, a porous catalyst is formed by grinding and compounding a nitrogen-containing precursor with a metal salt and controlling the calcination temperature and time. This catalyst is then used to react with organic wastewater and an oxidant to degrade organic pollutants.
It achieves efficient and rapid degradation of chemical organic wastewater, with degradation rates of dyes and antibiotics reaching 100% and 99% or more, respectively, avoiding secondary pollution. The catalyst has good stability and is suitable for a wide range of chemical organic wastewater treatment.
Smart Images
Figure CN120984335A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a catalyst for treating organic wastewater and a preparation method thereof, in particular to a high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater and a preparation method thereof. BACKGROUND
[0002] Water pollution, especially chemical organic wastewater pollution, has attracted widespread attention due to its serious harm to human health and significant negative impact on the ecosystem. Various organic compounds, such as dyes derived from textile processing, leather tanning, papermaking, food processing, and hair dyeing, pharmaceutical waste from hospitals and livestock farming, and agricultural chemicals, are difficult to degrade in conventional wastewater treatment processes due to their complex molecular structure. Dye wastewater accounts for 17%-20% of total industrial wastewater and is one of the most difficult to decompose. It is usually stable, highly water-soluble, non-biodegradable, and carcinogenic. Pharmaceuticals are the most important class of emerging organic pollutants, with 100,000-200,000 tons of antibiotics used worldwide each year, resulting in significant pharmaceutical residues in environmental matrices such as surface water and groundwater. Therefore, finding a practical solution and technology to treat antibiotics and dyes in wastewater has become a challenging task today.
[0003] Traditional methods such as adsorption, filtration, and coagulation have the advantages of simple process and mature technology, however, these methods only transfer organic pollutants from liquid phase to solid or gas phase, and inevitably cause secondary pollution. Dye wastewater treatment mostly adopts secondary treatment process, mainly composed of biochemical process (anaerobic-aerobic system) and physicochemical process (coagulation sedimentation or flotation). Biological methods such as anaerobic and aerobic processes can only treat biochemical oxygen demand (BOD) in contaminated water, and show unsatisfactory performance in dealing with toxic and refractory organic matter. Moreover, new dyes and technologies have significantly changed the composition and properties of wastewater, increasing the difficulty of dye wastewater treatment, resulting in a significant decrease in the efficiency of traditional wastewater treatment. The traditional biological process has limited ability to remove organic pollutants such as dyes and antibiotics from wastewater, and microorganisms are easily killed during the treatment process. Moreover, the use of biological methods for wastewater treatment occupies a large area.
[0004] In view of the current characteristics of complex composition, poor biodegradability, and high toxicity of chemical organic wastewater, it is urgent to develop more green, efficient, rapid, and advanced methods for treating chemical organic wastewater. SUMMARY
[0005] To solve the above technical problems, the application provides a high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater and a preparation method thereof, the catalyst is prepared by fully grinding a nitrogen-containing precursor with rich nitrogen content and a metal component, and by controlling calcination (carbonization reduction) temperature, calcination (carbonization reduction) time, and the ratio of the precursor to the metal component, and the catalyst is used for chemical organic wastewater treatment to achieve efficient and rapid degradation.
[0006] To achieve the above object, the technical scheme provided by the application is as follows.
[0007] A high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater, the catalyst is prepared by self-polymerization of a nitrogen-containing or functional group-rich precursor and a metal, to anchor a large number of metal ions and provide a stable coordination environment for the metal ions through rapid self-polymerization, thereby inhibiting metal aggregation and preventing metal leaching during use, and the catalyst has a porous and rough structure with an average diameter of 40-50 microns.
[0008] The preparation method of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater is as follows: a nitrogen-containing precursor is taken, a metal salt is added, and the mixture is ground into a thick paste, and then the paste is calcined in a muffle furnace or carbonized and reduced in a tube furnace in a protective gas environment, to obtain the high-activity nitrogen-doped catalyst; wherein the calcination temperature is 100-650 DEG C, and the calcination time is 0.5-8 h; the carbonization reduction temperature is 350-850 DEG C, and the carbonization reduction time is 0.5-8 h; the nitrogen-containing precursor is one of thiourea, melamine, urea, chitosan, or dopamine, and these precursors have rich nitrogen content; and the metal salt is at least one of copper, nickel, magnesium, iron, molybdenum, or cobalt ion salt.
[0009] The nitrogen-containing precursor is thiourea, chitosan, or melamine; the metal salt is copper sulfate, nickel sulfate, or cerium sulfate; the mass ratio of the nitrogen-containing precursor to the metal salt is 10:1-10; and the protective gas is nitrogen or argon.
[0010] The nitrogen-containing precursor is thiourea, and the metal salt is copper sulfate.
[0011] The calcination temperature is 450-550 DEG C, and the calcination time is 4 h.
[0012] The application of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater in degrading chemical organic wastewater.
[0013] The application of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater in degrading chemical organic wastewater is as follows: the high-activity nitrogen-doped catalyst is uniformly mixed with organic wastewater and an oxidizing agent, and heated to 20-90 DEG C for 1-240 min; wherein, the high-activity nitrogen-doped catalyst is added in an amount of 0.01-2 g per 60 mL of chemical organic wastewater; after the reaction, the reaction liquid is filtered by using a 0.22-micron needle filter, and then the concentration is tested. There are two testing methods: when the organic wastewater is a dye, the residual reaction liquid is detected by a UV-visible spectrophotometer; when the organic wastewater is an antibiotic or a herbicide, the residual reaction liquid is filtered, and the filtered reaction liquid is detected by high-performance liquid chromatography.
[0014] The organic wastewater is one of a dye, an antibiotic or a herbicide; the dye is crystal violet, rhodamine B, methylene blue, etc.; the antibiotic is tetracycline, sulfadiazine, etc.; and the herbicide is 2,4-dichlorophenoxyacetic acid; the concentration of the organic wastewater is 0.1-1000 mg / L.
[0015] The high-activity nitrogen-doped catalyst is added in an amount of 0.01-0.05 g per 60 mL of chemical organic wastewater.
[0016] The oxidizing agent is hydrogen peroxide, persulfate or peroxymonosulfate, etc.; the organic wastewater and the oxidizing agent are added in an amount of 0.1-5 mL of the oxidizing agent per 60 mL of the organic wastewater.
[0017] The reaction temperature is 60-80 DEG C, and the reaction time is 10-30 min.
[0018] Compared with the prior art, the application has the following beneficial effects:
[0019] (1) The high-activity nitrogen-doped catalyst is constructed by a simple grinding-assisted pyrolysis method, and the active metal component is fixed on the nitrogen-containing carrier by in-situ conversion, so that a catalyst with high activity and stability is obtained, and the problems of catalyst regeneration and metal elution are solved;
[0020] (2) The catalyst can be used for degrading organic wastewater, and has the advantages of small catalyst dosage, good catalyst performance, good degradation effect, and the highest degradation rate of 100% for dyes and 99% for antibiotics, so that the catalyst has a wide application prospect in the field of chemical organic wastewater treatment. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 is a SEM image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared in Example 1 of the application.
[0022] Figure 2 is the SEM image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared in Embodiment 2 of the present application.
[0023] Figure 3 is the degradation effect image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater obtained at different calcination temperatures on methylene blue solution.
[0024] Figure 4 is the SEM image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared in Embodiment 4 of the present application.
[0025] Figure 5 is the degradation effect image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared in the present application on different organic wastewater.
[0026] Figure 6 is the degradation effect image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared in the present application on methylene blue solution; wherein (A) is the degradation effect image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared from different nitrogen-containing precursors on methylene blue solution; (B) is the degradation effect image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared from different metal salts on methylene blue solution.
[0027] Figure 7 is the degradation effect image of the high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater prepared in Embodiment 2 of the present application on methylene blue solution at different dosages. DETAILED DESCRIPTION
[0028] The specific embodiments will be described in detail in the following with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments. The raw materials and reagents used in the examples are commercially available unless otherwise specified.
[0029] Embodiment 1
[0030] Preparation of high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater: according to the mass ratio of nitrogen precursor to metal salt being 10:3, 20 g of thiourea and 6 g of copper sulfate were weighed, the thiourea was added to the copper sulfate, and was ground into a thick paste, and was calcined in a muffle furnace at 450°C for 4 h, and after cooling to room temperature, the obtained material after calcination was washed with deionized water to remove excess metal ions, to obtain a high-activity nitrogen-doped catalyst, i.e. a CuO-based catalyst, the SEM image of which is shown in Figure 1 The catalyst particles are significantly visible, have a porous and rough structure, and the average diameter is between 40-50 microns.
[0031] The CuO-based catalyst obtained above was used to degrade methylene blue solution: 0.05 g of the CuO-based catalyst obtained above was placed in a reaction bottle, 0.1 mL of oxidant hydrogen peroxide was added, and then 60 mL of methylene blue solution with an initial concentration of 50 mg / L and pH = 7.0 was added, and the mixture was uniformly mixed, sealed, and shaken at 30°C for 10 min. After the reaction was completed, the reaction solution was filtered using a 0.22-micron needle filter, and then the concentration was tested: the absorbance was calculated by ultraviolet-visible spectrophotometry, and the removal rate of methylene blue within 10 min was 99.8%.
[0032] Example 2
[0033] A highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater was prepared: according to a mass ratio of nitrogen precursor to metal salt of 10:3, 20 g of nitrogen-containing precursor thiourea and 6 g of copper sulfate were weighed, the thiourea was added to the copper sulfate, and the mixture was ground into a thick paste, calcined in a muffle furnace at 550°C for 4 h, and then cooled to room temperature. The resulting material after calcination was washed with deionized water to remove excess metal ions, thereby obtaining a highly active nitrogen-doped catalyst, a CuO-based catalyst, the SEM image of which is shown in Figure 2 As the reaction temperature increased, the number of pores on the surface of the catalyst decreased, and the surface became more dense.
[0034] The CuO-based catalyst obtained above was used to degrade tetracycline solution: 0.05 g of the CuO-based catalyst obtained above was placed in a reaction bottle, 0.1 mL of oxidant hydrogen peroxide was added, and then 60 mL of tetracycline solution with an initial concentration of 50 mg / L and pH = 7.0 was added, and the mixture was uniformly mixed, sealed, and shaken at 30°C for 20 min.
[0035] After the reaction was completed, the reaction solution was filtered using a 0.22-micron needle filter, and then the concentration was tested: the reaction solution was filtered using a water-based filter membrane, the resulting reaction solution after filtration was detected by high-performance liquid chromatography, and the removal rate of tetracycline within 20 min was 97.2%.
[0036] Example 3
[0037] A highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater was prepared: according to a mass ratio of nitrogen precursor to metal salt of 10:3, 20 g of nitrogen-containing precursor thiourea and 6 g of copper sulfate were weighed, the thiourea was added to the copper sulfate, and the mixture was ground into a thick paste, calcined in a muffle furnace at 500°C for 4 h, and then cooled to room temperature. The resulting material after calcination was washed with deionized water to remove excess metal ions, thereby obtaining a highly active nitrogen-doped catalyst, a CuO-based catalyst.
[0038] Degradation of methylene blue solution by CuO-based catalyst prepared in Example 1, Example 2 and Example 3: 0.02 g of CuO-based catalyst prepared in Example 1, Example 2 and Example 3 was respectively placed in a reaction bottle, 8 mL of oxidant hydrogen peroxide was added, 60 mL of methylene blue solution with initial concentration of 50 mg / L and pH of 7.0 was added, and then the mixture was uniformly mixed, sealed and shaken at 70 ℃ for 90 min. During the reaction, the sample was taken every 5 min and filtered by using a 0.22 micron needle filter, and then the concentration of the reaction solution was tested. The reaction solution was detected by ultraviolet-visible spectrophotometer, and the removal rate was calculated by absorbance. The results are shown in Table 1. Figure 3 As can be seen from Table 1, the CuO-based catalyst calcined at 550 ℃ has better catalytic effect. Figure 3
[0039] Example 4
[0040] Preparation of high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater: according to the mass ratio of nitrogen precursor to metal salt of 10:1, 20 g of thiourea and 2 g of copper sulfate were respectively weighed, the thiourea was added to the copper sulfate, and then the mixture was ground into a thick paste, carbonized and reduced in a tube furnace under nitrogen environment at 850 ℃ for 4 h, and then the obtained material was washed with deionized water after carbonization and reduction to remove excess metal ions, thereby obtaining the high-activity nitrogen-doped catalyst, i.e. carbon nanotube catalyst. The SEM image is shown in FIG. 2. Figure 4
[0041] Degradation of methylene blue solution by the above carbon nanotube catalyst: 0.05 g of the above carbon nanotube catalyst was placed in a reaction bottle, 0.1 mL of oxidant hydrogen peroxide was added, 60 mL of methylene blue solution with initial concentration of 50 mg / L and pH of 7.0 was added, and then the mixture was uniformly mixed, sealed and shaken at 30 ℃ for 10 min.
[0042] After the reaction was completed, the reaction solution was filtered by using a 0.22 micron needle filter, and then the concentration of the reaction solution was tested. The reaction solution was detected by ultraviolet-visible spectrophotometer, and the removal rate was calculated by absorbance. The removal rate of methylene blue within 10 min was 99.1%.
[0043] Example 5
[0044] Preparation of high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater: according to the mass ratio of nitrogen precursor to metal salt of 10:5, 20 g of thiourea and 10 g of copper sulfate were respectively weighed, the thiourea was added to the copper sulfate, and then the mixture was ground into a thick paste, calcined in a muffle furnace at 550 ℃ for 4 h, and then the obtained material was washed with deionized water after calcination to remove excess metal ions, thereby obtaining the high-activity nitrogen-doped catalyst (CuO-based catalyst).
[0045] The CuO-based catalyst obtained above was used to degrade each organic wastewater: 0.02 g of the CuO-based catalyst obtained above was placed in a reaction bottle, 0.8 mL of the oxidant hydrogen peroxide was added, and then 60 mL of the organic wastewater with an initial concentration of 50 mg / L and pH = 7.0 was added and mixed uniformly, and after being sealed, the reaction was shaken at 70°C for 30 min; the organic wastewater was methylene blue solution, methyl orange solution, rhodamine B solution, tetracycline solution, sulfadiazine solution, and 2,4-dichlorophenoxyacetic acid solution, respectively, and the removal effect of the catalyst on the above organic wastewater was tested.
[0046] After the reaction was completed, the reaction liquid was filtered using a 0.22-micron needle filter, and then its concentration was tested: when the organic wastewater was a dye, the remaining reaction liquid was detected by a UV-visible spectrophotometer; when the organic wastewater was an antibiotic or a herbicide, the remaining reaction liquid was filtered, and the reaction liquid obtained after filtration was detected by high-performance liquid chromatography. The test results showed that the degradation rate of methylene blue (MB) was 99.92% within 30 min, the degradation rates of methyl orange (MO) and rhodamine B (RhB) were 100%, the degradation rate of tetracycline (TC) was 95.72%, the degradation rate of sulfadiazine was 98.54%, and the degradation rate of 2,4-dichlorophenoxyacetic acid (2,4-D) was 83.21%. Figure 5 ).
[0047] Example 6
[0048] The nitrogen-containing precursor "thiourea" in Example 2 was replaced with "chitosan" and "melamine", respectively, and the remaining operations were the same as those in Example 2 "Preparation of a high-efficiency nitrogen-doped catalyst for degrading chemical organic wastewater", and two different CuO-based catalysts were obtained.
[0049] The two different CuO-based catalysts obtained above and the CuO-based catalyst prepared in Example 2 were used to degrade methylene blue solution: 0.02 g of the CuO-based catalyst obtained above was placed in a reaction bottle, 0.8 mL of the oxidant hydrogen peroxide was added, and then 60 mL of the methylene blue solution with an initial concentration of 50 mg / L and pH = 7.0 was added and mixed uniformly, and after being sealed, the reaction was shaken at 70°C for 100 min. During the reaction, the reaction liquid at 5 min, 10 min, 15 min, 20 min, 25 min, and 30 min was filtered using a 0.22-micron needle filter, and its concentration was tested: the reaction liquid was detected by a UV-visible spectrophotometer, and the removal rate was calculated based on the absorbance, and the results are as follows: Figure 6As shown in FIG. A. As can be seen from the figure, the degradation rates of CuO-based catalysts prepared by using chitosan, melamine and thiourea as precursors were 76.93%, 58.41% and 93.25% respectively after 5 minutes of reaction, but the degradation effects on methylene blue were all greater than 98% after 30 minutes of reaction, and the degradation efficiency was as high as 99.95% after 100 minutes of reaction, indicating that the catalysts prepared by using the three nitrogen-containing precursors all had good catalytic performance.
[0050] Example 7
[0051] Example 2 “Copper sulfate” was replaced by “nickel sulfate” and “cerium sulfate” respectively, and the rest of the operations were the same as those in Example 2 “Preparation of high-efficiency degradation of chemical organic wastewater of high-activity nitrogen-doped catalyst”, and two different CuO-based catalysts were obtained.
[0052] The two different CuO-based catalysts obtained above and the CuO-based catalyst prepared in Example 2 were used to degrade methylene blue solution: 0.02 g of the CuO-based catalyst obtained above was placed in a reaction bottle, 0.8 mL of oxidant hydrogen peroxide was added, and 60 mL of methylene blue solution with an initial concentration of 50 mg / L and pH = 7.0 was added and mixed uniformly, and then the reaction bottle was sealed and shaken at 70°C for 100 minutes. During the reaction, 0.22-micron needle filters were used to filter the reaction solutions at 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes and 100 minutes respectively, and their concentrations were tested: the reaction solutions were detected by ultraviolet-visible spectrophotometer, and the removal rate was calculated by absorbance. The results are shown in FIG. B. Figure 6 B. As can be seen from Figure 6 B, the degradation efficiencies of the nitrogen-doped catalysts prepared by using cerium sulfate, nickel sulfate and copper sulfate as precursors were 79.74%, 82.76% and 99.95% respectively after 30 minutes of reaction in the catalytic degradation reaction, and the catalyst prepared by using copper sulfate as metal source had a faster reaction rate, indicating that the type of metal played a key role in the catalytic degradation process; but with the extension of reaction time, the degradation efficiencies under the action of the three catalysts were all greater than 95%.
[0053] Example 8
[0054] Example 2, 0.01 g, 0.02 g, 0.03 g, 0.04 g, 0.05 g, respectively, were used to degrade methylene blue solution: the above different mass of CuO-based catalysts were placed in a reaction bottle, 0.8 mL of oxidant hydrogen peroxide was added, then 60 mL of methylene blue solution with initial concentration of 50 mg / L and pH = 7.0 was added and mixed uniformly, and then the reaction bottle was sealed and shaken at 70°C for 100 min. During the reaction, the reaction solution at 0 min, 5 min, 10 min, 15 min, 20 min, 25 min, 30 min was filtered using a 0.22 micron needle filter, and its concentration was tested: the reaction solution was detected by ultraviolet-visible spectrophotometer, and the removal rate was calculated by absorbance, and the results are shown in Table 2. Figure 7 As the catalyst dosage increased from 0.01 g to 0.05 g, the degradation efficiency increased from 83.14% to 96.35%. The enhancement of catalytic activity can be attributed to the increased availability of active sites provided by higher catalyst dosage, which promotes the activation of H2O2 and the generation of more active oxygen species, thus accelerating the degradation of methylene blue.
[0055] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the present application. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to allow others skilled in the art to understand the application for various exemplary embodiments with various modifications being suitable. The scope of the application is intended to be defined by the claims and their equivalents.
Claims
1. A highly active nitrogen-doped catalyst for the efficient degradation of chemical organic wastewater, characterized in that: This catalyst utilizes nitrogen-containing or functionally rich precursors to self-polymerize with metals, thereby anchoring a large number of metal ions and providing a stable coordination environment for the metal ions through rapid self-polymerization, thus inhibiting metal aggregation and preventing metal leaching during use. The catalyst has a porous and rough structure with an average diameter of 40-50 micrometers.
2. The method for preparing the highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater as described in claim 1, characterized in that: A nitrogen-containing precursor is taken, a metal salt is added, and the mixture is ground into a viscous paste. The paste is then calcined or carbonized and reduced in a protective gas environment to obtain a highly active nitrogen-doped catalyst. The calcination temperature is 100-650℃, and the calcination time is 0.5-8 h. The carbonization and reduction temperature is 350-850℃, and the carbonization and reduction time is 0.5-8 h. The nitrogen-containing precursor is one of thiourea, melamine, urea, chitosan, or dopamine. The metal salt is at least one of copper, nickel, magnesium, iron, molybdenum, or cobalt ion salts.
3. The method for preparing the highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater according to claim 2, characterized in that: The nitrogen-containing precursors are thiourea, chitosan, and melamine; the metal salts are copper sulfate, nickel sulfate, and cerium sulfate; the mass ratio of the nitrogen-containing precursor to the metal salt is 10:1-10; and the protective gas is nitrogen or argon.
4. The method for preparing the highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater according to claim 2, characterized in that: The nitrogen-containing precursor is thiourea, and the metal salt is copper sulfate.
5. The method for preparing the highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater according to claim 2, characterized in that: The calcination temperature is 450-550℃, and the calcination time is 4 hours.
6. The application of the highly active nitrogen-doped catalyst for the efficient degradation of chemical organic wastewater as described in claim 1 or the highly active nitrogen-doped catalyst for the efficient degradation of chemical organic wastewater prepared by any of the methods in claims 2-5 in the degradation of chemical organic wastewater.
7. The application according to claim 6, characterized in that: Take the highly active nitrogen-doped catalyst for efficiently degrading chemical organic wastewater, mix it evenly with organic wastewater and oxidant, and heat it to 20-90℃ for 1-240 min; wherein, the amount of highly active nitrogen-doped catalyst added is 0.01-2g of highly active nitrogen-doped catalyst per 60mL of chemical organic wastewater.
8. The application according to claim 6, characterized in that: The organic wastewater is one of a dye, antibiotic, or herbicide; the dye is crystal violet, rhodamine B, or methylene blue; the antibiotic is tetracycline or sulfadiazine; and the herbicide is 2,4-dichlorophenoxyacetic acid.
9. The application according to claim 7, characterized in that: The dosage of highly active nitrogen-doped catalyst is 0.01-0.05 g per 60 mL of chemical organic wastewater.
10. The application according to claim 7, characterized in that: The oxidant is hydrogen peroxide, persulfate, or peroxymonosulfate; the organic wastewater and the amount of oxidant added are 0.1-5 mL of oxidant per 60 mL of organic wastewater; the reaction temperature is 60-80℃, and the reaction time is 10-30 min.