Porous compost product charcoal as well as preparation method and application thereof

Abstract

The invention discloses porous compost product biochar as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing humic acid and a nitrogen-containing solution to obtain a mixed solution, putting a compost product into the mixed solution for dipping, and calcining to obtain the porous compost product biochar. According to the preparation method disclosed by the invention, the generation of a pore structure of the compost product and the increase of a specific surface area and reaction active sites are promoted through the repolymerization effect of humic acid on a raw material aggregate structure of the compost product and the impact force of gas generated by volatilization of a nitrogen-containing compound in a calcining process; therefore, the porous compost product biochar which is rich in pore structure, large in specific surface area and multiple in reaction active sites is prepared. The porous compost product biochar is used for treating organic pollutant water, has the advantages of convenience, rapidness, simplicity in operation, high treatment efficiency, good removal effect and the like, and can realize efficient removal of organic pollutants in the environment.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a porous compost product biochar and a preparation method and application thereof. Background Art

[0002] Biochar has been widely used in the field of environmental remediation due to its environmental friendliness, abundant raw materials, and simple preparation process. The strong oxidizing active species generated by biochar activation of persulfate can efficiently degrade organic pollution, so it is considered to be an ideal environmental pollution control technology. However, the limited pore structure and reaction active sites of biochar limit its adsorption performance and catalytic activity. To solve the above problems, the commonly used biochar modification methods currently include constructing composite biochar catalysts or introducing external metal elements for doping. However, composite catalysts are prone to collapse, and when biochar introduces external metal elements, the leaching of metal elements is prone to cause secondary pollution risks, which slows down the performance optimization process of biochar. Therefore, how to overcome the above problems and obtain a porous compost product biochar that is green, environmentally friendly, has no secondary pollution risk, has high treatment efficiency, and has good removal effect is of great significance for achieving efficient removal of organic pollutants in the environment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a porous compost product biochar with rich pore structure, large specific surface area, multiple reaction active sites, green and environmentally friendly, no secondary pollution risk, high treatment efficiency and good removal effect, as well as a preparation method and application thereof.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] A method for preparing porous compost product biochar, comprising the following steps:

[0006] (1) mixing humic acid and a nitrogen-containing solution to obtain a mixed solution;

[0007] (2) placing the compost product in the mixed solution obtained in step (1), immersing the compost product in the mixed solution, and drying the mixed solution to obtain a mixture;

[0008] (3) calcining the mixture obtained in step (2) to obtain a porous compost product biochar.

[0009] The above preparation method is further improved, in step (1), the concentration of humic acid in the mixed solution is 0.02kg / L to 0.15kg / L, the concentration of the nitrogen-containing solution is 1M to 11M, the pH value of the nitrogen-containing solution is greater than 7, and the nitrogen-containing solution is at least one of urea solution, melamine solution and dicyandiamide solution.

[0010] The above preparation method is further improved in that in step (2), the mass ratio of the compost product to humic acid is 1:0.02-0.3.

[0011] The above preparation method is further improved, in step (2), the immersion time is 0.5h to 6h, the immersion is carried out under stirring conditions, the stirring speed is 200rpm to 500rpm, the drying temperature is 50℃ to 80℃, and the drying time is 10h to 20h.

[0012] The above preparation method is further improved, in step (2), the compost product is at least one of a cow dung compost product, a sheep dung compost product, a vermicompost product and a dead branch and leaf compost product, and the compost product is pretreated as follows before use: the compost product is dried, crushed and sieved; the drying temperature is 50°C to 80°C, the drying time is 10h to 20h, and the sieving is through a 200-mesh sieve.

[0013] The above preparation method is further improved in that in step (3), the calcination is carried out under a nitrogen atmosphere, the calcination temperature is 500° C. to 800° C., and the calcination time is 2 h to 4 h.

[0014] As a general technical concept, the present invention also provides a porous compost product biochar obtained by the above-mentioned preparation method.

[0015] As a general technical concept, the present invention also provides a use of the above-mentioned porous compost product biochar in treating water bodies with organic pollutants.

[0016] The above application is further improved and includes the following steps: mixing the porous compost product biochar and the organic pollutant water, adding persulfate to react, and removing the organic pollutants in the water; the ratio of the porous compost product biochar to the organic pollutant water is 0.1g~0.5g:1L.

[0017] The above application is further improved, wherein the concentration of organic pollutants in the organic pollutant water body is ≤20 mg / L, the organic pollutants in the organic pollutant water body are antibiotics, and the antibiotics are tetracycline hydrochloride; the ratio of persulfate to organic pollutant water body is 0.1 mmol~1 mmol:1L, the persulfate is at least one of peroxymonosulfate and peroxydisulfate, the peroxymonosulfate is potassium peroxymonosulfate, and the peroxydisulfate is sodium peroxydisulfate; the mixing time is 0.5h~1.5h, the reaction time is 0.5h~3.5h, the reaction temperature is 20℃~30℃, the reaction is carried out under stirring conditions, and the stirring speed is 200rpm~600rpm.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The present invention provides a method for preparing porous compost product biochar, using loose compost product as raw material, humic acid as modifier, nitrogen-containing solution as pore former and solvent promoter, and promoting the formation of pore structure of compost product raw material and the increase of specific surface area and reactive sites through the reaggregation effect of humic acid on the aggregate structure of compost product raw material and the impact force of gas generated by volatilization of nitrogen-containing compounds during calcination, thereby preparing porous compost product biochar with rich pore structure, large specific surface area and many reactive sites. In the preparation method of the present invention, the materials and reagents used do not contain metal ions or toxic non-metallic ions, and the prepared biochar has the characteristics of green environmental protection and environmental friendliness, avoiding the risk of secondary pollution caused by ion overflow during the use of biochar, and having the advantages of simple preparation process, low cost, and batch production, and can realize industrial large-scale production, which is convenient for industrial utilization.

[0020] (2) The present invention also provides an application of porous compost product biochar in treating water bodies containing organic pollutants, wherein the porous compost product biochar and water bodies containing organic pollutants are mixed for adsorption, and persulfate is added for reaction to achieve removal of organic pollutants in the water body. The application of the present invention has the advantages of being convenient and fast, simple to operate, high in treatment efficiency, and good in removal effect, and has a good application prospect, and can achieve efficient removal of organic pollutants in the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Scanning electron microscope images of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the common humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3.

[0022] Figure 2 The X-ray diffraction patterns of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the common humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3 are shown.

[0023] Figure 3 It is a Fourier infrared spectrum diagram of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the common humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3.

[0024] Figure 4The nitrogen adsorption-desorption curves and the specific surface area and pore volume distribution diagrams are of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the ordinary humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3.

[0025] Figure 5 This is a diagram showing the removal effect of tetracycline hydrochloride on the porous compost product biochar, conventional cow dung compost product biochar, common humic acid modified cow dung compost product biochar, and urea modified cow dung compost product biochar in Example 2 of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby. The materials and instruments used in the following embodiments are all commercially available.

[0027] Embodiment 1:

[0028] A method for preparing porous compost product biochar of the present invention comprises the following steps:

[0029] (1) The cow dung compost product was placed in a forced air drying oven and dried at 60° C. for 12 h; then crushed by a pulverizer and passed through a 200-mesh sieve to obtain a cow dung compost product powder. The cow dung compost product was purchased from Macheng Siweibo Biotechnology Co., Ltd.

[0030] (2) Weigh 0.1 g of humic acid and put it into 5 mL of 9 M urea solution, and stir at 300 rpm for 2 h at room temperature to obtain a mixed solution. In this step, the pH value of the urea solution is 8.4.

[0031] (3) Weigh 5 g of the cow dung compost product powder obtained in step (1) and put it into the mixed solution obtained in step (2), and stir and immerse it at a rotation speed of 300 rpm for 2 h to obtain a compost product mixture.

[0032] (4) Drying the compost product mixture obtained in step (3) at 60° C. for 12 h, and grinding to obtain humic acid compost product mixture powder.

[0033] (5) Weigh 5 g of the humic acid compost product mixture powder obtained in step (4) and place it in a crucible. Under the protection of a nitrogen atmosphere, heat it to 800° C. at a heating rate of 10° C. / min, calcine it at 800° C. for 2 h, and then grind it to obtain porous compost product biochar.

[0034] Comparative Example 1:

[0035] A method for preparing biochar from conventional cow dung composting products comprises the following steps:

[0036] (1) The cow dung compost product was placed in a forced air drying oven, dried at 60° C. for 12 h, crushed by a pulverizer, and passed through a 200-mesh sieve to obtain cow dung compost product powder.

[0037] (2) Weigh 5 g of the cow dung compost product powder obtained in step (1) and put it into 5 mL of distilled water, stir and soak it at a speed of 300 rpm for 2 h to obtain a soaked cow dung compost product.

[0038] (3) drying the soaked cow dung compost product obtained in step (2) at 60° C. for 12 h, and then grinding to obtain a treated cow dung compost product powder.

[0039] (4) Weigh 5 g of the treated cow dung compost product powder obtained in step (3) and place it in a crucible. Under the protection of a nitrogen atmosphere, heat it to 800° C. at a heating rate of 10° C. / min, calcine it at 800° C. for 2 h, and then grind it to obtain conventional cow dung compost product biochar.

[0040] Comparative Example 2:

[0041] A method for preparing biochar from common humic acid modified cow dung compost product, comprising the following steps:

[0042] (1) The cow dung compost product was placed in a forced air drying oven, dried at 60° C. for 12 h, crushed by a pulverizer, and passed through a 200-mesh sieve to obtain cow dung compost product powder.

[0043] (2) Weigh 0.1 g of humic acid and put it into 5 mL of distilled water. Stir and immerse the mixture at room temperature and at a rotation speed of 300 rpm for 2 h to obtain a humic acid suspension.

[0044] (3) Weigh 5 g of the cow dung compost product powder obtained in step (1) and put it into 5 mL of the humic acid suspension obtained in step (2), and stir at a rotation speed of 300 rpm for 2 h to obtain a cow dung compost product mixture.

[0045] (4) drying the cow dung compost product mixture obtained in step (3) at 60° C. for 12 h, and then grinding to obtain a mixture powder.

[0046] (5) Weigh 5 g of the mixture powder obtained in step (4) and place it in a crucible. Under nitrogen atmosphere protection, heat it to 800° C. at a heating rate of 10° C. / min, and calcine it at 800° C. for 2 h. Then grind it to obtain ordinary humic acid modified cow dung compost product biochar.

[0047] Comparative Example 3:

[0048] A method for preparing biochar from urea-modified cow dung compost product, comprising the following steps:

[0049] (1) The cow dung compost product was placed in a forced air drying oven, dried at 60° C. for 12 h, crushed by a pulverizer, and passed through a 200-mesh sieve to obtain cow dung compost product powder.

[0050] (2) Weigh 2.7 g of urea and put it into 5 mL of distilled water. Dissolve it at room temperature and at a rotation speed of 300 rpm for 1 min to obtain a urea solution.

[0051] (3) Weigh 5 g of the cow dung compost product powder obtained in step (1) and put it into 5 mL of the urea solution obtained in step (2), and stir and immerse for 2 h at a rotation speed of 300 rpm to obtain a cow dung compost product mixture.

[0052] (4) drying the cow dung compost product mixture obtained in step (3) at 60° C. for 12 h, and then grinding to obtain a mixture powder.

[0053] (5) Weigh 5 g of the mixture powder obtained in step (4) and place it in a crucible. Under the protection of a nitrogen atmosphere, heat it to 800° C. at a heating rate of 10° C. / min, and calcine it at 800° C. for 2 h. Then grind it to obtain urea-modified cow dung compost product biochar.

[0054] Scanning electron microscopy, X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, and fully automatic specific surface and porosity analyzer were used to characterize the morphology, lattice characteristics, surface functional group characteristics, and pore and specific surface area characteristics of the biochar prepared by the above method.

[0055] Figure 1 Scanning electron microscope images of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the common humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3. Figure 1 Among them, (a) is the biochar produced by porous composting, (b) is the biochar produced by conventional cow dung composting, (c) is the biochar produced by ordinary humic acid-modified cow dung composting, and (d) is the biochar produced by urea-modified cow dung composting. Figure 1 As can be seen from (a), the porous cow dung compost product biochar has a large amount of loose particles, rich pore structure, and loose overall structure. Figure 1 It can be observed in (b) that the biochar produced by conventional cow dung composting has no fine loose particles on its surface and has a relatively compact structure. Figure 1 As can be seen in (c), the surface of the biochar produced by ordinary humic acid modified cow dung compost is dotted with abundant needle-like structures, but the overall structure of the biochar is relatively compact. Figure 1(d) It can be observed that the surface of the urea-modified cow dung composting product biochar has a more loose and porous structure, but the overall structure is relatively compact. It can be seen that the humic acid treatment alone cannot increase the pore structure of the cow dung composting product biochar, and the overall structure of the urea-modified cow dung composting product biochar is still relatively compact and not loose enough. In contrast, urea combined with humic acid treatment can effectively improve the pore structure of the cow dung composting product biochar, and the overall structure is loose, which is more conducive to the adsorption of organic pollutants and the activation of persulfate.

[0056] Figure 2 The X-ray diffraction patterns of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the common humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3. Compared with the conventional cow dung compost product biochar, the lattice structure of the cow dung compost product biochar modified by humic acid, urea, and humic acid and urea did not show obvious changes, which indicates that urea and humic acid will not affect the lattice structure of the cow dung compost product biochar.

[0057] Figure 3 It is a Fourier infrared spectrum diagram of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the common humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3. Figure 3 Medium, 600-900cm -1 The absorption peak caused by the aromatic ring is 975cm -1 is the bending vibration of the CH bond in the outer plane of the olefin, 1041 cm -1 It is caused by the stretching vibration of CO bond, 1458cm -1 Originated from C=O interaction, 1051~1558cm -1 Corresponding to C=C bonding, 3500~3850cm -1 The absorption peaks at are caused by -OH and -NH bonds. Compared with conventional cow dung compost biochar, the CO bond, C=O bond and C=C bond adsorption peak intensity of compost biochar increased after modification with humic acid alone and urea alone. The CO bond, C=O bond and C=C adsorption intensity of porous compost biochar was further improved after modification with urea combined with humic acid, indicating that the combination of humic acid and urea can increase the number of surface functional groups of cow dung compost biochar.

[0058] Figure 4The nitrogen adsorption-desorption curves and the specific surface area and pore volume distribution diagrams are of the porous compost product biochar in Example 1 of the present invention, the conventional cow dung compost product biochar in Comparative Example 1, the ordinary humic acid modified cow dung compost product biochar in Comparative Example 2, and the urea modified cow dung compost product biochar in Comparative Example 3. Figure 4 In the figure, (a) is the nitrogen adsorption-desorption curve, and (b) is the specific surface area and pore volume distribution diagram. Figure 4 (a) It can be seen that compared with conventional cow dung compost product biochar, the adsorption capacity of conventional humic acid modified cow dung compost product biochar, urea modified cow dung compost product biochar, and porous cow dung compost product biochar are all improved, and the adsorption capacity of porous cow dung compost product biochar is the most significantly improved, indicating that the adsorption capacity of compost product biochar can be effectively improved after combined treatment with humic acid and urea, that is, the order of adsorption performance is: porous compost product biochar>urea modified cow dung compost product biochar>conventional humic acid modified cow dung compost product biochar>conventional cow dung compost product biochar. Figure 4 (b) It can be seen that the specific surface areas of conventional cow dung composting biochar, ordinary humic acid modified cow dung composting biochar, urea modified cow dung composting biochar, and porous composting biochar are 50.95m 2 ·g -1 、52.16m 2 ·g -1 、53.66m 2 ·g -1 、63.18m 2 ·g -1 , and their pore volumes are 0.074 cm 3 ·g -1 、0.076cm 3 ·g -1 、0.078cm 3 ·g -1 、0.095cm 3 ·g -1 , that is, the specific surface area and pore volume of compost product biochar are ranked as follows: porous compost product biochar > urea modified cow dung compost product biochar > ordinary humic acid modified cow dung compost product biochar > conventional cow dung compost product biochar. It can be seen that compared with conventional cow dung compost product biochar, urea modified cow dung compost product biochar, and ordinary humic acid modified cow dung compost product biochar, the specific surface area and pore structure of porous compost product biochar modified by urea and humic acid are significantly increased, which significantly increases the reactive sites of porous compost product biochar, thereby effectively enhancing the reactive activity of porous compost product biochar.

[0059] Embodiment 2:

[0060] An application of the porous compost product biochar of the present invention in treating water bodies with organic pollutants, specifically using the porous compost product biochar to activate persulfate to remove tetracycline hydrochloride in water bodies, comprises the following steps:

[0061] Take 10 mg of each of the porous compost product biochar prepared in Example 1, the conventional cow dung compost product biochar prepared in Comparative Example 1, the ordinary humic acid modified cow dung compost product biochar prepared in Comparative Example 2, and the urea modified cow dung compost product biochar prepared in Comparative Example 3, and add them to 50 mL of a tetracycline hydrochloride (TCH) solution with a concentration of 10 mg / L and a pH of 4.86, mix them evenly, and adsorb and treat tetracycline hydrochloride for 60 minutes at room temperature (25°C) and 300 rpm to reach adsorption-desorption equilibrium; then, add 0.5 mL of a 100 mM potassium peroxymonosulfate (KHSO5, PMS) solution, and continue the reaction for 150 minutes at room temperature (25°C) and a rotation speed of 300 rpm to complete the degradation of tetracycline hydrochloride in the water.

[0062] Figure 5 The figure is a graph showing the removal effect of tetracycline hydrochloride by porous compost product biochar, conventional cow dung compost product biochar, common humic acid modified cow dung compost product biochar, and urea modified cow dung compost product biochar in Example 2 of the present invention. Figure 5 It can be seen that in the adsorption equilibrium stage, the adsorption capacity of different biochars for tetracycline hydrochloride (TCH) is ranked as follows: porous composting product biochar > urea-modified cow dung composting product biochar > ordinary humic acid-modified cow dung composting product biochar > conventional cow dung composting product biochar; in the PMS activation and degradation of tetracycline hydrochloride stage, within 150 minutes, the degradation efficiencies of porous composting product biochar, conventional cow dung composting product biochar, ordinary humic acid-modified cow dung composting product biochar, and urea-modified cow dung composting product biochar for tetracycline hydrochloride were 90.7%, 76%, 80%, and 84.5%, respectively, that is, the degradation efficiency was ranked as follows: porous composting product biochar > urea-modified cow dung composting product biochar > ordinary humic acid-modified cow dung composting product biochar > conventional cow dung composting product biochar. It can be seen that the porous compost product biochar of the present invention has the best adsorption effect on tetracycline hydrochloride and can better activate persulfate to efficiently degrade tetracycline hydrochloride.

[0063] The preparation method of porous compost product biochar of the present invention uses loosely structured compost products as raw materials, humic acid as a modifier, and nitrogen-containing solution as a pore-forming agent and humic acid dissolution promoter. The humic acid regulation during the calcination process and the impact of the gas generated by the volatilization of nitrogen-containing compounds promote the generation of the pore structure of the compost product, as well as the increase of the specific surface area and the reactive sites, thereby achieving the efficient adsorption of organic pollutants by the porous compost product biochar and the effective activation of persulfate, and finally efficiently degrading the organic pollutants. The preparation method of the present invention has the advantages of simple preparation process, safe raw materials, low cost, batch production, etc., can realize industrial large-scale production, and is convenient for industrial utilization; the porous compost product biochar prepared by the method has the advantages of rich pore structure, large specific surface area, and many reactive sites, and is a new type of biochar with excellent performance, which can be widely used in the treatment of organic pollutants, has high use value, and has good application prospects.

[0064] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in the preferred embodiment, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention, still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing porous compost product biochar, characterized in that: The following steps are involved: (1) mixing humic acid and a nitrogen-containing solution to obtain a mixed solution; (2) placing the compost product in the mixed solution obtained in step (1), immersing the compost product in the mixed solution, and drying the mixed solution to obtain a mixture; (3) calcining the mixture obtained in step (2) to obtain a porous compost product biochar.

2. The method for preparing porous compost product biochar according to claim 1, characterized in that: In step (1), the concentration of humic acid in the mixed solution is 0.02kg / L to 0.15kg / L, the concentration of the nitrogen-containing solution is 1M to 11M, the pH value of the nitrogen-containing solution is greater than 7, and the nitrogen-containing solution is at least one of a urea solution, a melamine solution and a dicyandiamide solution.

3. The method for preparing porous compost product biochar according to claim 2, characterized in that: In step (2), the mass ratio of the compost product to humic acid is 1:0.02-0.

3.

4. The method for preparing porous compost product biochar according to any one of claims 1 to 3, characterized in that: In step (2), the immersion time is 0.5 h to 6 h, the immersion is carried out under stirring conditions, the stirring speed is 200 rpm to 500 rpm, the drying temperature is 50° C. to 80° C., and the drying time is 10 h to 20 h.

5. The method for preparing porous compost product biochar according to claim 4, characterized in that: In step (2), the compost product is at least one of a cow dung compost product, a sheep dung compost product, a vermicompost product and a dead branch and leaf compost product, and the compost product is pretreated as follows before use: the compost product is dried, crushed and sieved; the drying temperature is 50° C. to 80° C., the drying time is 10 h to 20 h, and the sieving is through a 200-mesh sieve.

6. The method for preparing porous compost product biochar according to any one of claims 1 to 3, characterized in that: In step (3), the calcination is carried out under a nitrogen atmosphere, the calcination temperature is 500° C. to 800° C., and the calcination time is 2 h to 4 h.

7. A porous compost product biochar prepared by the preparation method according to any one of claims 1 to 6.

8. Use of the porous compost product biochar as claimed in claim 7 in treating water bodies with organic pollutants.

9. The use according to claim 8, characterized in that: The following steps are involved: The porous compost product biochar and the organic pollutant water are mixed, and persulfate is added to react to achieve the removal of organic pollutants in the water; the ratio of the porous compost product biochar to the organic pollutant water is 0.1g-0.5g:1L.

10. The use according to claim 9, characterized in that: The concentration of organic pollutants in the organic pollutant water body is ≤20 mg / L, the organic pollutants in the organic pollutant water body are antibiotics, and the antibiotics are tetracycline hydrochloride; the ratio of persulfate to organic pollutant water body is 0.1 mmol-1 mmol:1 L, the persulfate is at least one of peroxymonosulfate and peroxydisulfate, the peroxymonosulfate is potassium peroxymonosulfate, and the peroxydisulfate is sodium peroxydisulfate; the mixing time is 0.5 h-1.5 h, the reaction time is 0.5 h-3.5 h, the reaction temperature is 20° C.-30° C., the reaction is carried out under stirring conditions, and the stirring speed is 200 rpm-600 rpm.

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