Method and device for microwave photocatalytic degradation treatment of organic wastewater

Abstract

The application relates to the technical field of organic wastewater treatment, in particular to an organic wastewater microwave photocatalytic degradation treatment method and device.The organic wastewater microwave photocatalytic degradation treatment method comprises the following steps: a, mixing a composite catalyst and organic wastewater according to a mass-volume ratio of 1:100-1:1000; b, placing the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjusting the wavelength of an ultraviolet light source to 180-280 nm, adjusting the power of a microwave generator to 100-800 W, and keeping for 10-60 min to obtain treated wastewater; wherein the composite catalyst is a biochar-based composite photocatalyst. The application provides an organic wastewater microwave photocatalytic degradation treatment method and device, so as to solve the problems of slow reaction rate and poor degradation rate in the microwave photocatalytic treatment of organic wastewater in the prior art.

Description

Technical Field

[0001] This application relates to the field of organic wastewater treatment technology, and in particular to a microwave photocatalytic degradation treatment method and apparatus for organic wastewater. Background Technology

[0002] With rapid industrialization and urbanization, the problem of organic wastewater discharge has become increasingly serious, posing a severe threat to the ecological environment and human health. The efficient treatment of organic wastewater has become an important issue for environmental protection and sustainable development.

[0003] In existing technologies, the main methods for treating organic wastewater include biological treatment, physical treatment, and advanced oxidation methods. Biological treatment utilizes the metabolism of microorganisms to convert organic matter in organic wastewater into inorganic matter, but its treatment time is relatively long and it has high requirements for water quality and temperature. Physicochemical methods remove pollutants from organic wastewater through physical or chemical means, but they may cause secondary pollution and have high treatment costs. Advanced oxidation methods use strong oxidants to generate free radicals to oxidize and decompose organic matter in organic wastewater, and have advantages such as high treatment efficiency and wide applicability.

[0004] Microwave photocatalysis is an advanced oxidation method that can rapidly treat high concentrations of organic pollutants without adding any chemicals, thus avoiding secondary pollution. However, microwave photocatalysis requires the use of photocatalysts, which come into dynamic contact with organic pollutants, resulting in slow reaction rates and poor degradation rates. Summary of the Invention

[0005] This application provides a method and apparatus for microwave photocatalytic degradation treatment of organic wastewater, in order to solve the problems of slow reaction rate and poor degradation rate in microwave photocatalytic treatment of organic wastewater in related technologies.

[0006] In a first aspect, a microwave photocatalytic degradation treatment method for organic wastewater is provided, which includes the following steps:

[0007] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass-to-volume ratio of 1:100 to 1:1000;

[0008] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 180-280nm, adjust the power of the microwave generator to 100-800W, and maintain for 10-60 minutes to obtain the treated wastewater.

[0009] The composite catalyst is a biochar-based composite photocatalyst, and the preparation method of the biochar-based composite photocatalyst includes:

[0010] S1. Preparation of modified wood biochar: The wood raw material is washed, dried and crushed, and then impregnated in the modification solution at a mass-volume ratio of 1:50 to 1:100. The mixture is stirred or ultrasonically treated for 10 to 20 minutes. The impregnated wood raw material is taken out and carbonized at 400 to 900°C for 2 to 6 hours under a nitrogen atmosphere. After cooling, the initial product is obtained. The initial product is washed with anhydrous ethanol and deionized water respectively and then dried to obtain modified wood biochar.

[0011] S2. Preparation of ZnS nanoparticles;

[0012] S3. Preparation of N / ZnS precursor solution: The ZnS nanoparticles are dispersed in deionized water, and an auxiliary agent is added under continuous stirring. The temperature is maintained at 300-600℃ and stirred for 0.5-1h to obtain N / ZnS precursor solution. The auxiliary agent is selected from urea and ammonia.

[0013] S4. Preparation of Sb / N / ZnS solution: Heat the N / ZnS precursor solution to 80-160℃, and under stirring conditions, add 0.01mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5 to 1:10, and keep stirring and heating for 1-6 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0014] S5. Preparation of biochar-based composite photocatalyst: The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Sb / N / ZnS solution was added dropwise under stirring and stirring was maintained for 0.5 to 2 hours. After centrifugation, washing with anhydrous ethanol and deionized water, and drying, the biochar-based composite photocatalyst was obtained.

[0015] Preferably, the modified solution comprises 1-5 parts zinc chloride, 1-5 parts ammonium phosphate, and 50 parts deionized water.

[0016] Preferably, the modified liquid further includes ammonium dithiocarbamate, urea and thiourea in a mass ratio of 1:2:1, and the mass ratio of ammonium dithiocarbamate to ammonium phosphate is 1:1 to 1:3.

[0017] Preferably, the wood material is selected from one of birch, teak, pine and oak.

[0018] Preferably, after carbonization at 400–900°C for 2–6 hours under a nitrogen atmosphere, step S1 further includes:

[0019] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60–80 °C and stirred for 2–4 h. The solid product was obtained by centrifugation, washed with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0020] Preferably, step S2 includes:

[0021] S201. Zinc acetate and sodium thiosulfate are mixed and dissolved in 100 mL of deionized water at a molar ratio of 1:1. The pH is adjusted to 5-6 using acetic acid. The molar amount of zinc acetate is 0.01-0.03 mol.

[0022] S202. Add 0.05-0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201. React at 90-180℃ for 1-6 h under stirring. After cooling to room temperature, centrifuge to obtain solid product. Wash with anhydrous ethanol and deionized water respectively, and dry at 60-70℃ to obtain ZnS nanoparticles.

[0023] Preferably, the ZnS nanoparticles have a particle size of 1–8 nm.

[0024] Secondly, a microwave photocatalytic treatment device for organic wastewater is provided, comprising:

[0025] A microwave reaction chamber, which includes a microwave generator;

[0026] A wastewater reaction chamber is provided in the microwave reaction chamber. The wastewater reaction chamber includes an inlet, an outlet, and a feed port. The feed port is located at the top of the wastewater reaction chamber and is used to add composite photocatalyst. The feed port is connected to an airflow valve.

[0027] An ultraviolet light source is installed inside the wastewater reaction chamber and is connected to a power source.

[0028] Preferably, a stirrer is provided in the wastewater reaction chamber.

[0029] The beneficial effects of the technical solution provided in this application include:

[0030] This application provides a microwave photocatalytic degradation treatment method and apparatus for organic wastewater. Using wood biochar as a substrate, the biochar is modified by introducing -NH and -SH to improve its adsorption capacity for organic pollutants. Simultaneously, the specific surface area and porosity of the biochar are increased, further enhancing its adsorption capacity. Furthermore, ZnS is loaded onto the modified wood biochar. Under microwave irradiation, the photocatalyst on the modified wood biochar generates photogenerated electrons and holes, thereby generating superoxide radicals (O2). -• and hydroxyl radicals (·OH) promote the oxidative degradation of organic pollutants;

[0031] Simultaneously, doping the loaded ZnS with N and Sb alters the electronic and band structures of ZnS, broadens its photoresponse range, promotes the separation of photogenerated electrons and holes in ZnS nanoparticles, reduces recombination efficiency, and effectively improves its photocatalytic performance.

[0032] The composite catalyst is excited under microwave irradiation, generating highly reactive free radicals. These free radicals attack the organic matter in the wastewater, causing it to undergo oxidative decomposition. Under the attack of free radicals, the organic matter gradually decomposes into smaller molecules. Ultimately, the recalcitrant organic matter is transformed into easily degradable small molecules, directly generating CO2 and H2O. Due to the excellent photocatalytic performance of the composite catalyst, it can effectively improve the reaction rate and degradation rate. Therefore, it can solve the problems of slow reaction rate and poor degradation rate in microwave photocatalytic treatment of organic wastewater in related technologies. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A flowchart of the microwave photocatalytic treatment method for organic wastewater provided in this application;

[0035] Figure 2 A flowchart illustrating the method for preparing the biochar-based composite photocatalyst provided in this application;

[0036] Figure 3 This is a schematic diagram of the structure of the microwave photocatalytic device for organic wastewater provided in the embodiments of this application.

[0037] In the diagram: 1. Wastewater reaction chamber; 101. Inlet; 102. Outlet; 103. Agitator; 104. Filter screen; 2. Microwave reaction chamber; 201. Microwave generator; 3. Feed port; 301. Airflow valve; 4. Ultraviolet light source; 5. Power supply. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application provides a microwave photocatalytic degradation method for organic wastewater, which solves the problems of slow reaction rate and poor degradation rate in related technologies for microwave photocatalytic treatment of organic wastewater. See also... Figures 1-2 As shown, the microwave photocatalytic degradation treatment method for organic wastewater includes the following steps:

[0040] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass-to-volume ratio of 1:100 to 1:1000;

[0041] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 180-280nm, adjust the power of the microwave generator to 100-800W, and maintain for 10-60 minutes to obtain the treated wastewater.

[0042] The composite catalyst used is a biochar-based composite photocatalyst, and the preparation method of the biochar-based composite photocatalyst includes the following steps:

[0043] S1. Preparation of modified wood biochar: The wood raw material is washed, dried and crushed, and then impregnated in the modification solution at a mass-volume ratio of 1:100. The mixture is stirred or ultrasonically treated for 10-20 minutes. The impregnated wood raw material is then removed and carbonized at 400-900℃ for 2-6 hours under a nitrogen atmosphere. After cooling, the initial product is obtained. The initial product is washed with anhydrous ethanol and deionized water respectively and then dried to obtain modified wood biochar.

[0044] In some embodiments, the wood material is selected from one of birch, teak, pine and oak.

[0045] In some embodiments, the modified solution comprises 1 to 5 parts zinc chloride and 1 to 5 parts ammonium phosphate, wherein the zinc chloride and ammonium phosphate are dissolved in 50 parts deionized water.

[0046] In some embodiments, the modified liquid further includes ammonium dithiocarbamate, urea, and thiourea in a mass ratio of 1:2:1, wherein the mass ratio of ammonium dithiocarbamate to ammonium phosphate is 1:1 to 1:3.

[0047] In some embodiments, after carbonization at 400–900°C for 2–6 hours under a nitrogen atmosphere in step S1, step S1 further includes:

[0048] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60–80 °C and stirred for 2–4 h. The solid product was obtained by centrifugation, washed with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0049] Specifically, wood biochar contains functional groups such as carboxyl, phenolic hydroxyl, and lactone groups. In microwave photocatalytic degradation technology, its porous structure and functional groups can be used to adsorb and enrich organic pollutants. By subsequently loading ZnS onto modified wood biochar, under microwave irradiation, the photocatalyst on the modified wood biochar generates photogenerated electrons and holes, thereby generating superoxide radicals (O2). - ·) and hydroxyl radicals (·OH) promote the oxidative degradation of organic pollutants.

[0050] Furthermore, by impregnating the modified wood biochar with a modified liquid, amino groups are introduced to improve the photocatalytic activity of the modified wood biochar and enhance its ability to adsorb and degrade organic pollutants.

[0051] Furthermore, by impregnating the modified wood biochar with a modified liquid containing ammonium dithiocarbamate, urea, and thiourea, the surface of the modified wood biochar is enriched with functional groups such as -NH and -SH, thereby improving its adsorption capacity for organic pollutants and thus improving the removal efficiency of organic matter.

[0052] Furthermore, after obtaining the initial product, it was further dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60–80 °C and stirred for 2–4 h to further oxidize and modify the initial product, introducing anchoring sites (-COOH, -OH functional groups) on the biochar surface that are conducive to the loading of ZnS nanoparticles.

[0053] S2. Preparation of ZnS nanoparticles.

[0054] In some embodiments, the ZnS nanoparticles have a particle size of 1–8 nm.

[0055] In some embodiments, step S2 includes the following steps:

[0056] S201. Zinc acetate and sodium thiosulfate are mixed and dissolved in 100 mL of deionized water at a molar ratio of 1:1. The pH is adjusted to 5-6 using acetic acid. The molar amount of zinc acetate is 0.01-0.03 mol.

[0057] S202. Add 0.05-0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201. React at 90-180℃ for 1-6 h under stirring. After cooling to room temperature, centrifuge to obtain solid product. Wash with anhydrous ethanol and deionized water respectively, and dry at 60-70℃ to obtain ZnS nanoparticles.

[0058] S3. Disperse the ZnS nanoparticles in deionized water, add an auxiliary agent while stirring continuously, maintain the temperature at 300-600℃ and stir for 0.5-1h to obtain an N / ZnS precursor solution. The auxiliary agent is selected from urea and ammonia.

[0059] During the heat treatment process, urea and ammonia decompose to produce ammonia gas. The ammonia gas reacts with Zn or S atoms on the surface of ZnS nanoparticles, doping nitrogen into the ZnS lattice, thus obtaining N-doped ZnS nanoparticles. This doping can change the band structure of ZnS, improve its photocatalytic performance, and at the same time improve the charge distribution in ZnS nanoparticles, increase the separation efficiency of photogenerated electrons and holes, and reduce recombination.

[0060] S4. Heat the N / ZnS precursor solution to 80-160°C. Under stirring, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5 to 1:10, and keep stirring and heating for 1-6 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0061] Introducing antimony ions into the crystal lattice of ZnS nanoparticles alters their electronic and band structures, broadening their photoresponse range. Furthermore, antimony doping can promote the separation of photogenerated electrons and holes within the ZnS nanoparticles, reducing their recombination probability and thus further enhancing their photocatalytic activity.

[0062] S5. The modified wood biochar is dissolved in anhydrous ethanol at a mass ratio of 1:20. The Sb / N / ZnS solution is added at a rate of 60 drops / minute using a 0.05 mL / drop dropper under stirring conditions, and stirring is maintained for 0.5 to 2 hours. After centrifugation, washing with anhydrous ethanol and deionized water, and drying, the biochar-based composite photocatalyst is obtained.

[0063] Example 1

[0064] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0065] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0066] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0067] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this embodiment includes the following steps:

[0068] S1. Preparation of modified wood biochar: Teak wood is washed, dried and crushed. 10g of the crushed teak wood is weighed and immersed in 500ml of modification solution. The mixture is ultrasonically treated for 20min. The immersed teak wood is carbonized at 800℃ for 5h under nitrogen atmosphere. After cooling, the initial product is obtained. The modification solution includes 3g zinc chloride, 3g ammonium phosphate, 1g ammonium dithiocarbamate, 2g urea and 1g thiourea. The zinc chloride, ammonium phosphate, ammonium dithiocarbamate, urea and thiourea are dissolved in 500mL of deionized water to form the modification solution.

[0069] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60°C and stirred for 3 h. The solid product was obtained by centrifugation, washed three times with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0070] S2. Preparation of ZnS nanoparticles:

[0071] S201. Dissolve 0.03 mol zinc acetate and 0.03 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 6 using acetic acid;

[0072] S202. Add 0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 160 °C for 3 h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65 °C to obtain ZnS nanoparticles.

[0073] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0074] S4. Heat the N / ZnS precursor solution to 80°C. Under stirring conditions, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5, and keep stirring and heating for 3 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0075] S5. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, the Sb / N / ZnS solution was added at a rate of 60 drops / minute using a 0.05 mL / drop dropper. The mixture was stirred for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0076] Example 2

[0077] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0078] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0079] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 180nm, adjust the power of the microwave generator to 100W, and maintain for 50 minutes to obtain the treated wastewater.

[0080] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this embodiment includes the following steps:

[0081] S1. Preparation of modified wood biochar: Teak wood is washed, dried, and crushed. 10g of the crushed teak wood is weighed and immersed in 500ml of modification solution. The mixture is ultrasonically treated for 20min. The immersed teak wood is carbonized at 900℃ under nitrogen atmosphere for 2h. After cooling, the initial product is obtained. The modification solution includes 3g zinc chloride, 3g ammonium phosphate, 1g ammonium dithiocarbamate, 2g 25wt% ammonia water, and 1g thiourea. The zinc chloride, ammonium phosphate, ammonium dithiocarbamate, urea, and thiourea are dissolved in 500mL of deionized water to form the modification solution.

[0082] The initial product was washed three times with anhydrous ethanol and three times with deionized water, and then dried to obtain modified lignobiochar.

[0083] S2. Preparation of ZnS nanoparticles:

[0084] S201. Dissolve 0.03 mol zinc acetate and 0.03 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 6 using acetic acid;

[0085] S202. Add 0.05 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 160 °C for 3 h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65 °C to obtain ZnS nanoparticles.

[0086] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0087] S4. Heat the N / ZnS precursor solution to 80°C. Under stirring conditions, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5, and keep stirring and heating for 3 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0088] S5. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, the Sb / N / ZnS solution was added at a rate of 60 drops / minute using a 0.05 mL / drop dropper. The mixture was stirred for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0089] Example 3

[0090] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0091] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0092] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 280nm, adjust the power of the microwave generator to 800W, and maintain for 30 minutes to obtain the treated wastewater.

[0093] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this embodiment includes the following steps:

[0094] S1. Preparation of modified wood biochar: After washing and drying birch wood, crush it. Weigh 10g of crushed teak wood and immerse it in 500ml of modification solution. Sonicate it for 20min. Carbonize the impregnated teak wood at 400℃ for 6h under nitrogen atmosphere. After cooling, obtain the initial product. The modification solution includes 3g of zinc chloride and 3g of ammonium phosphate. The zinc chloride and ammonium phosphate are dissolved in 500mL of deionized water to form the modification solution.

[0095] The initial product was washed three times with anhydrous ethanol and three times with deionized water, and then dried to obtain modified lignobiochar.

[0096] S2. Preparation of ZnS nanoparticles:

[0097] S201. Dissolve 0.01 mol zinc acetate and 0.01 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 5 using acetic acid;

[0098] S202. Add 0.1g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 90℃ for 3h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65℃ to obtain ZnS nanoparticles.

[0099] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0100] S4. Heat the N / ZnS precursor solution to 80°C. Under stirring conditions, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5, and keep stirring and heating for 3 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0101] S5. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, the Sb / N / ZnS solution was added at a rate of 60 drops / minute using a 0.05 mL / drop dropper. The mixture was stirred for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0102] Example 4

[0103] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0104] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0105] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 200nm, adjust the power of the microwave generator to 600W, and maintain for 60min to obtain the treated wastewater.

[0106] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this embodiment includes the following steps:

[0107] S1. Preparation of modified wood biochar: Teak wood is washed, dried and crushed. 10g of the crushed teak wood is weighed and immersed in 500ml of modification solution. The mixture is ultrasonically treated for 20min. The immersed teak wood is carbonized at 800℃ for 5h under nitrogen atmosphere. After cooling, the initial product is obtained. The modification solution includes 3g of zinc chloride and 3g of ammonium phosphate. The zinc chloride and ammonium phosphate are dissolved in 500mL of deionized water to form the modification solution.

[0108] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60°C and stirred for 3 h. The solid product was obtained by centrifugation, washed three times with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0109] S2. Preparation of ZnS nanoparticles:

[0110] S201. Dissolve 0.02 mol zinc acetate and 0.02 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 6 using acetic acid;

[0111] S202. Add 0.08 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 180 °C for 3 h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65 °C to obtain ZnS nanoparticles.

[0112] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0113] S4. Heat the N / ZnS precursor solution to 80°C. Under stirring conditions, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5, and keep stirring and heating for 3 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0114] S5. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, the Sb / N / ZnS solution was added at a rate of 60 drops / minute using a 0.05 mL / drop dropper. The mixture was stirred for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0115] Example 5

[0116] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0117] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500, that is, add 1g of composite photocatalyst to 500mL of organic wastewater;

[0118] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0119] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The difference between the preparation method of the biochar-based composite photocatalyst in this embodiment and that in Example 1 is that the wood material used in this embodiment is pine wood.

[0120] Example 6

[0121] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0122] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:200;

[0123] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0124] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. In this embodiment, except that the woody raw material in step S1 is replaced with oak, the preparation method of the biochar-based composite photocatalyst is the same as in Example 1.

[0125] Example 7

[0126] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0127] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:1000;

[0128] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0129] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this embodiment is the same as that in Example 1.

[0130] Example 8

[0131] The microwave photocatalytic degradation method for organic wastewater provided in this embodiment includes the following steps:

[0132] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500, that is, add 1g of composite photocatalyst to 500mL of organic wastewater;

[0133] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0134] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The difference between the preparation method of the biochar-based composite photocatalyst in this embodiment and that in Example 1 is that in step S1, the modified liquid includes 5g zinc chloride, 5g ammonium phosphate, 2g ammonium dithiocarbamate, 4g urea, and 2g thiourea. The zinc chloride, ammonium phosphate, ammonium dithiocarbamate, urea, and thiourea are dissolved in 500mL of deionized water to form the modified liquid.

[0135] Comparative Example 1

[0136] The microwave photocatalytic degradation method for organic wastewater provided in this comparative example includes the following steps:

[0137] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0138] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0139] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this comparative example includes the following steps:

[0140] S1. Preparation of wood biochar: Teak wood is washed, dried and crushed. 10g of crushed teak wood is weighed and carbonized at 800℃ for 5h under nitrogen atmosphere. After cooling, the initial product is obtained.

[0141] The initial product was washed three times with anhydrous ethanol and three times with deionized water, and then dried to obtain lignobiochar.

[0142] S2. Preparation of ZnS nanoparticles:

[0143] S201. Dissolve 0.03 mol zinc acetate and 0.03 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 6 using acetic acid;

[0144] S202. Add 0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 160 °C for 3 h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65 °C to obtain ZnS nanoparticles.

[0145] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0146] S4. Heat the N / ZnS precursor solution to 80°C. Under stirring conditions, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5, and keep stirring and heating for 3 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0147] S5. Dissolve the wood biochar in anhydrous ethanol at a mass ratio of 1:20. Add the Sb / N / ZnS solution at a rate of 60 drops / minute using a 0.05 mL / drop dropper while stirring for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst is obtained.

[0148] Comparative Example 2

[0149] The microwave photocatalytic degradation method for organic wastewater provided in this comparative example includes the following steps:

[0150] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0151] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0152] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this comparative example includes the following steps:

[0153] S1. Preparation of modified wood biochar: Teak wood is washed, dried and crushed. 10g of crushed teak wood is weighed and carbonized at 800℃ for 5h under nitrogen atmosphere. After cooling, the initial product is obtained.

[0154] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60°C and stirred for 3 h. The solid product was obtained by centrifugation, washed three times with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0155] S2. Preparation of ZnS nanoparticles:

[0156] S201. Dissolve 0.03 mol zinc acetate and 0.03 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 6 using acetic acid;

[0157] S202. Add 0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 160 °C for 3 h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65 °C to obtain ZnS nanoparticles.

[0158] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0159] S4. Heat the N / ZnS precursor solution to 80°C. Under stirring conditions, add 0.01 mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5, and keep stirring and heating for 3 hours. After cooling, the Sb / N / ZnS solution is obtained.

[0160] S5. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, the Sb / N / ZnS solution was added at a rate of 60 drops / minute using a 0.05 mL / drop dropper. The mixture was stirred for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0161] Comparative Example 3

[0162] The microwave photocatalytic degradation method for organic wastewater provided in this comparative example includes the following steps:

[0163] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0164] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0165] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this comparative example includes the following steps:

[0166] S1. Preparation of modified wood biochar: Teak wood is washed, dried and crushed. 10g of the crushed teak wood is weighed and immersed in 500ml of modification solution. The mixture is ultrasonically treated for 20min. The immersed teak wood is carbonized at 800℃ for 5h under nitrogen atmosphere. After cooling, the initial product is obtained. The modification solution includes 3g zinc chloride, 3g ammonium phosphate, 1g ammonium dithiocarbamate, 2g urea and 1g thiourea. The zinc chloride, ammonium phosphate, ammonium dithiocarbamate, urea and thiourea are dissolved in 500mL of deionized water to form the modification solution.

[0167] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60°C and stirred for 3 h. The solid product was obtained by centrifugation, washed three times with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0168] S2. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, a 10wt% urea solution with a mass ratio of 1:1 to anhydrous ethanol was added at a rate of 60 drops / minute using a dropper. After stirring continuously for 30 minutes, a 0.01mol / L antimony nitrate solution with a volume ratio of 1:5 to anhydrous ethanol was added at a rate of 60 drops / minute using a dropper. Stirring was maintained for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0169] Comparative Example 4

[0170] The microwave photocatalytic degradation method for organic wastewater provided in this comparative example includes the following steps:

[0171] a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass ratio of 1:500;

[0172] b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 254nm, adjust the power of the microwave generator to 600W, and maintain for 60 minutes to obtain the treated wastewater.

[0173] In step a above, the composite catalyst used is a biochar-based composite photocatalyst. The preparation method of the biochar-based composite photocatalyst in this comparative example includes the following steps:

[0174] S1. Preparation of modified wood biochar: Teak wood is washed, dried and crushed. 10g of the crushed teak wood is weighed and immersed in 500ml of modification solution. The mixture is ultrasonically treated for 20min. The immersed teak wood is carbonized at 800℃ for 5h under nitrogen atmosphere. After cooling, the initial product is obtained. The modification solution includes 3g zinc chloride, 3g ammonium phosphate, 1g ammonium dithiocarbamate, 2g urea and 1g thiourea. The zinc chloride, ammonium phosphate, ammonium dithiocarbamate, urea and thiourea are dissolved in 500mL of deionized water to form the modification solution.

[0175] The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60°C and stirred for 3 h. The solid product was obtained by centrifugation, washed three times with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

[0176] S2. Preparation of ZnS nanoparticles:

[0177] S201. Dissolve 0.03 mol zinc acetate and 0.03 mol sodium thiosulfate in 100 mL of deionized water, and adjust the pH to 6 using acetic acid;

[0178] S202. Add 0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201, react at 160 °C for 3 h under stirring, cool to room temperature, centrifuge to obtain solid product, wash with anhydrous ethanol and deionized water respectively, and dry at 65 °C to obtain ZnS nanoparticles.

[0179] S3. Disperse the ZnS nanoparticles in deionized water, add urea while stirring continuously, maintain the temperature at 400℃ and stir for 1 hour to obtain an N / ZnS precursor solution.

[0180] S4. The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:20. Under stirring conditions, N / ZnS solution was added at a rate of 60 drops / minute using a 0.05 mL / drop dropper. Stirring was maintained for 1 hour. After centrifugation, washing with anhydrous ethanol and deionized water three times each, and drying, the biochar-based composite photocatalyst was obtained.

[0181] Specifically, the preparation methods and the amount of modified liquid added in Examples 1-8 and Comparative Examples 1-4 are compared in Table 1.

[0182] Table 1 compares the modified biochar preparation methods in Examples 1-8 with those in Comparative Examples 1-4.

[0183]

[0184]

[0185] Using methylene blue as the target pollutant, the biochar-based composite photocatalysts prepared in Examples 1-8 and Comparative Examples 1-4 were used for microwave photocatalytic treatment of organic wastewater. Specifically, 10 L of organic wastewater with an initial methylene blue concentration of 100 mg / L was provided. The biochar-based composite photocatalyst was added according to the addition ratio of Examples 1-8 and Comparative Examples 1-4, mixed and stirred, and reacted at room temperature (25-27°C) for 5 h. Wastewater samples were taken at 1 h, 2 h, 4 h, and 5 h to detect the methylene blue concentration and calculate the removal rate. The removal rate test results are shown in Table 2. The mass ratio in Table 2 is the mass ratio of biochar-based composite photocatalyst to organic wastewater.

[0186] Table 2. Removal of p-methylene blue wastewater in Examples 1-8 and Comparative Examples 1-4

[0187]

[0188] It can be seen that the methods provided in Examples 1 and 7 of this application, as well as the biochar-based composite photocatalyst used therein, have high removal efficiency and higher degradation rate. This is because the modified wood-based biochar has had impurities removed after modification, its surface groups improved, its specific surface area and porosity increased, and its adsorption performance enhanced. This effectively enriches organic pollutants on the surface of the biochar-based composite photocatalyst, and then, through Sb doping... 2+ In addition, nitrogen element regulates the band structure of ZnS nanoparticles, enhancing their ability to absorb visible light.

[0189] In the preferred method for treating organic wastewater in this application, the removal rate of organic matter in the organic wastewater can reach over 98%.

[0190] This application also provides a treatment device for the microwave photocatalytic degradation of organic wastewater, see [link to relevant documentation]. Figure 3 As shown, it includes a microwave reaction chamber 2, a wastewater reaction chamber 1, and an ultraviolet light source 4. The microwave reaction chamber 2 includes a microwave generator 201, and the wastewater reaction chamber 1 is disposed in the microwave reaction chamber 2. The microwave generator 201 is disposed on the inner wall of the microwave reaction chamber 2 facing the wastewater reaction chamber.

[0191] Preferably, see Figure 3 As shown, the ultraviolet light source 4 is located outside the wastewater reaction chamber 1 and inside the microwave reaction chamber 2. The wastewater reaction chamber 1 is made of transparent material, so that the ultraviolet light emitted by the ultraviolet light source 4 can pass through the wastewater reaction chamber 1 to cause the biochar-based composite photocatalyst to react.

[0192] Furthermore, combined Figure 3 As shown, the wastewater reaction chamber 1 includes an inlet 101, an outlet 102, and a feed port 3. The feed port 3 is located at the top of the wastewater reaction chamber 1 and is used to add biochar-based composite photocatalyst. The feed port 3 is connected to an airflow valve 301. When adding the biochar-based composite photocatalyst from the feed port 3, the airflow valve 301 can be opened to allow the biochar-based composite photocatalyst to be more uniformly dispersed in the organic wastewater.

[0193] Furthermore, a stirrer 103 is installed in the wastewater reaction chamber 1. The stirrer 103 is connected to a power supply 105. After adding the biochar-based composite photocatalyst, the organic wastewater can be stirred by the stirrer 103, so that the biochar-based composite photocatalyst and the organic wastewater are fully mixed.

[0194] Furthermore, a filter screen 104 is provided in the outlet 102 to prevent the biochar-based composite photocatalyst from being lost or blocked during the drainage process. After the wastewater reaction chamber 1 stops draining, the biochar-based composite photocatalyst can be recovered by removing the filter screen 104.

[0195] Furthermore, the stirrer 103, the ultraviolet light source 4, and the microwave generator 201 are connected to the power supply 5.

[0196] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for microwave photocatalytic degradation treatment of organic wastewater, characterized in that, It includes the following steps: a. Mix the composite catalyst and organic wastewater in the wastewater reaction chamber at a mass-to-volume ratio of 1:100 to 1:1000; b. Add the composite catalyst to the wastewater reaction chamber and stir. Place the mixed organic wastewater and composite catalyst in a microwave reaction chamber, adjust the wavelength of the ultraviolet light source to 180-280nm, adjust the power of the microwave generator to 100-800W, and maintain for 10-60 minutes to obtain the treated wastewater. The composite catalyst is a biochar-based composite photocatalyst, and the preparation method of the biochar-based composite photocatalyst includes: S1. Preparation of modified wood biochar: The wood raw material is washed, dried and crushed, and then impregnated in the modification solution at a mass-volume ratio of 1:50 to 1:

100. The mixture is stirred or ultrasonically treated for 10 to 20 minutes. The impregnated wood raw material is taken out and carbonized at 400 to 900°C for 2 to 6 hours under a nitrogen atmosphere. After cooling, the initial product is obtained. The initial product is washed with anhydrous ethanol and deionized water respectively and then dried to obtain modified wood biochar. S2. Preparation of ZnS nanoparticles; S3. Preparation of N / ZnS precursor solution: The ZnS nanoparticles are dispersed in deionized water, and an auxiliary agent is added under continuous stirring. The temperature is maintained at 300-600℃ and stirred for 0.5-1h to obtain N / ZnS precursor solution. The auxiliary agent is selected from urea and ammonia. S4. Preparation of Sb / N / ZnS solution: Heat the N / ZnS precursor solution to 80-160℃, and under stirring conditions, add 0.01mol / L antimony nitrate solution dropwise to the N / ZnS precursor solution at a volume ratio of 1:5 to 1:10, and keep stirring and heating for 1-6 hours. After cooling, the Sb / N / ZnS solution is obtained. S5. Preparation of biochar-based composite photocatalyst: The modified wood biochar was dissolved in anhydrous ethanol at a mass ratio of 1:

20. Under stirring conditions, Sb / N / ZnS solution was added dropwise using a dropper and stirring was maintained for 0.5 to 2 hours. After centrifugation, washing with anhydrous ethanol and deionized water, and drying, the biochar-based composite photocatalyst was obtained.

2. The microwave photocatalytic degradation treatment method for organic wastewater as described in claim 1, characterized in that: The modified solution comprises 1-5 parts zinc chloride, 1-5 parts ammonium phosphate, and 50 parts deionized water.

3. The microwave photocatalytic degradation treatment method for organic wastewater as described in claim 2, characterized in that: The modified liquid also includes ammonium dithiocarbamate, urea and thiourea in a mass ratio of 1:2:1, and the mass ratio of ammonium dithiocarbamate to ammonium phosphate is 1:1 to 1:

3.

4. The microwave photocatalytic degradation treatment method for organic wastewater as described in claim 1, characterized in that: The wood material is selected from one of birch, teak, pine and oak.

5. The microwave photocatalytic degradation treatment method for organic wastewater as described in claim 1, characterized in that, After carbonization at 400–900°C for 2–6 hours under a nitrogen atmosphere, step S1 further includes: The initial product was dispersed and impregnated in a 0.1 mol / L nitric acid solution at 60–80 °C and stirred for 2–4 h. The solid product was obtained by centrifugation, washed with anhydrous ethanol and deionized water respectively, and then dried to obtain modified lignobiochar.

6. The microwave photocatalytic degradation treatment method for organic wastewater as described in claim 1, characterized in that, Step S2 includes: S201. Zinc acetate and sodium thiosulfate are mixed and dissolved in 100 mL of deionized water at a molar ratio of 1:

1. The pH is adjusted to 5-6 using acetic acid. The molar amount of zinc acetate is 0.01-0.03 mol. S202. Add 0.05-0.1 g of hexadecyltrimethylammonium bromide to the solution obtained in step S201. React at 90-180℃ for 1-6 h under stirring. After cooling to room temperature, centrifuge to obtain solid product. Wash with anhydrous ethanol and deionized water respectively, and dry at 60-70℃ to obtain ZnS nanoparticles.

7. The microwave photocatalytic degradation treatment method for organic wastewater as described in claim 1 or 6, characterized in that: The ZnS nanoparticles have a particle size of 1–8 nm.

8. A microwave photocatalytic degradation treatment device for organic wastewater, used to implement the treatment method according to any one of claims 1 to 7, characterized in that, It includes: A microwave reaction chamber, which includes a microwave generator; A wastewater reaction chamber is provided in the microwave reaction chamber. The wastewater reaction chamber includes an inlet, an outlet, and a feed port. The feed port is located at the top of the wastewater reaction chamber and is used to add composite photocatalyst. The feed port is connected to an airflow valve. An ultraviolet light source is installed inside the wastewater reaction chamber and is connected to a power source.

9. The microwave photocatalytic degradation treatment device for organic wastewater as described in claim 8, characterized in that: The wastewater reaction chamber is equipped with a stirrer, which is connected to a power source.

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