Application of CoNi-LDH-MXene film

Abstract

The invention relates to an application of a CoNi-LDH-MXene thin film, the CoNi-LDH-MXene thin film is combined with peroxymonosulfate to treat a polluted water body, and the pollutant of the polluted water body is bisphenol A. The CoNi-LDH-MXene thin film has the advantages that the CoNi-LDH-MXene thin film can be used for treating the polluted water body; according to the method, the CoNi-LDH-MXene thin film is used for activating the peroxymonosulfate to remove the endocrine disrupter in the water, and the method has the advantages of being easy to operate, small in secondary pollution and high in pollutant removal rate.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and particularly to the application of a CoNi-LDH-MXene film. Background Art

[0002] In recent years, emerging pollutants, including personal care products, endocrine disruptors, pharmaceuticals, and persistent organic pollutants, etc., have attracted wide global attention. Many of these pollutants have been proven to be harmful to human health and are closely associated with the occurrence of various diseases, such as endocrine diseases, cerebrovascular sclerosis, and cancer. Endocrine disruptors (EDCs) are a class of chemical substances that can interfere with the endocrine system of organisms and are commonly found in environmental pollutants, industrial chemicals, and certain consumer products. They affect the reproductive, developmental, and metabolic processes of organisms by mimicking or blocking the action of hormones. Long-term exposure may lead to health problems such as reproductive abnormalities, endocrine diseases, and certain cancers, posing a potential threat to humans and the ecological environment. Bisphenol A (BPA) is a common environmental endocrine disruptor that widely exists in plastic products, food packaging, and some personal care products. It interferes with the human endocrine system by mimicking the action of estrogen, resulting in various health problems. Therefore, there is an urgent need to find effective methods to solve the pollution problem of BPA in the water environment. Facing the deterioration of the environment affected by pollutants, advanced oxidation technologies (AOPs) based on strong reactive oxygen species (ROS) are currently widely used. Among them, the PMS oxidation process technology has high reaction efficiency and strong oxidation ability for pollutants, standing out in the treatment of emerging pollutants.

[0003] Layered double metal hydroxides (LDHs), also known as hydrotalcites, are a class of highly ordered layered two-dimensional materials mainly composed of positively charged host lamellae and interlayer charge-compensating anions. Currently, catalysts based on layered double metal hydroxides (LDHs), such as Fe-Co-LDH, Co-Mn-LDH, etc., have been proven to be effective heterogeneous catalysts for degrading pollutants.

[0004] MXene (Ti 3 C 2 T x ) materials are carbon-based materials with exposed metal sites on the surface, which can provide stronger adsorption and activation capabilities. After electrostatic combination of MXene and LDHs, the electronic composition and density of the catalytic centers of LDHs can be reassembled, thereby regulating the catalytic performance of LDHs in the PMS system. At the same time, the interfacial interaction between the two materials can also effectively prevent the leaching of metal ions from LDHs. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide an application of CoNi-LDH-MXene film in view of the above deficiencies in the prior art. It uses CoNi-LDH-MXene film to activate peroxymonosulfate to remove endocrine disruptors in water, and has the advantages of simple operation, little secondary pollution, and high pollutant removal rate.

[0006] The above object of the present invention is achieved by the following technical solutions: An application of CoNi-LDH-MXene film, combining CoNi-LDH-MXene film with peroxymonosulfate to treat contaminated water, and the pollutant in the contaminated water is bisphenol A.

[0007] Furthermore, the preparation method of the CoNi-LDH-MXene film includes, The process of preparing a monolayer (few-layer) MXenes dispersion by reacting concentrated hydrochloric acid (12 mol / L HCl), lithium fluoride (LiF), and aluminum carbonitride (Ti 3 A1C 2 ); The process of preparing CoNi-LDH powder by reacting cobalt nitrate (Co(NO 3 )) 2 ), nickel nitrate hexahydrate (Ni(NO 3 )) 3 ·6H 2 O) and urea; And the process of preparing CoNi-LDH-MXene film by reacting monolayer MXenes dispersion and CoNi-LDH powder.

[0008] Furthermore, in the process of preparing the monolayer MXenes dispersion, first add 15-25 mL of concentrated hydrochloric acid into a polytetrafluoroethylene reaction kettle, then slowly add 1.5-2.5 g of lithium fluoride, stir with a magnetic stirrer until dissolved, then slowly add 0.5-1.5 g of aluminum carbonitride, and stir and react at 30-50 °C for 45-50 h to etch the aluminum carbonitride. After the etching is completed, perform post-treatment to obtain a monolayer MXenes dispersion.

[0009] Furthermore, in the process of preparing the monolayer MXenes dispersion, after the etching is completed, the reaction solution is centrifuged at 3500 - 4500 r / min for 4 - 6 min, the precipitate is collected, and then washed with dilute hydrochloric acid (1 mol / L HCl) to remove lithium fluoride. Then it is centrifuged at 3500 - 4500 r / min for 4 - 6 min and repeated multiple times until the supernatant is colorless and transparent. Then it is washed with pure water, centrifuged at 3500 - 4500 r / min for 4 - 6 min and repeated multiple times until the pH of the supernatant is 5.5 - 6.5. The precipitate is collected and ultrasonicated with pure water. Inert gas is introduced and ice - water bath is used for protection. The ultrasonic time lasts for 1.5 - 2.5 h, and the ice bag is changed every 25 - 35 min. After the ultrasonic treatment is completed, it is centrifuged at 3500 - 4500 r / min for 4 - 6 min to obtain the monolayer MXenes dispersion.

[0010] Furthermore, in the process of preparing the CoNi - LDH powder, first add 0.55 - 0.65 g of cobalt nitrate and 0.55 - 0.65 g of nickel nitrate hexahydrate, then add a mixed solution of 8 - 12 mL of ethanol and 35 - 45 mL of deionized water, stir and mix for 25 - 35 min, then add 0.5 - 0.7 g of urea, continue to stir for 25 - 35 min until dissolved. Then transfer the mixed solution to a stainless - steel autoclave lined with polytetrafluoroethylene and put it into an oven, heat - react at 110 - 130 °C for 20 - 30 h. After the reaction is completed, through post - treatment, the CoNi - LDH powder is obtained.

[0011] Furthermore, in the process of preparing the CoNi - LDH powder, after the reaction is completed, the reaction solution and the precipitate are centrifuged at 1500 - 2500 r / min for 4 - 6 min, the precipitate is collected, dried in a vacuum oven at 50 - 70 °C for 10 - 15 h, and then ground to obtain the CoNi - LDH powder.

[0012] Furthermore, in the process of preparing the CoNi - LDH - MXene film, first add 0.050 - 0.060 g of CoNi - LDH powder into 100 - 150 ml of pure water, ultrasonically disperse for 30 min, then add 35 - 45 mL of monolayer MXenes dispersion, stir and mix evenly. Then take 10 - 15 mL of the mixed solution and vacuum - filter it on a PVDF microporous membrane to obtain the CoNi - LDH - MXene film.

[0013] Furthermore, in the process of preparing the CoNi - LDH - MXene film, control the mass ratio of MXene to CoNi - LDH to be 1.0:0.6 - 1.0.

[0014] Further, after adding the peroxymonosulfate into the contaminated water body, it passes through the CoNi-LDH-MXene film by a peristaltic pump and is filtered through a 0.22 μm Teflon membrane filter to remove the pollutants in the contaminated water body.

[0015] Furthermore, the pollutant concentration of the contaminated water body is 1-10 mg / mL.

[0016] Still further, the dosage of peroxymonosulfate in the contaminated water body is 0.1-0.3 mol / L.

[0017] In summary, the beneficial technical effects of the present invention are as follows: The CoNi-LDH-MXene composite material has a high specific surface area, which is conducive to the contact between the catalyst and the reactants, thereby improving the reaction efficiency. At the same time, the introduction of MXene enables the active sites of CoNi-LDH to be better exposed, enhancing its catalytic activity; There is a synergistic effect between CoNi-LDH and MXene. The high conductivity of MXene can promote the rapid transfer of electrons in CoNi-LDH, further improving the activation efficiency of PMS. Thus, it selectively generates 1 O 2 so that BPA has a high removal rate of 99.9%; Using the CoNi-LDH-MXene film of the present invention can efficiently activate peroxymonosulfate to remove bisphenol A in water (the removal rate exceeds 99%). This system is easy to operate, has a high removal efficiency, can be used continuously for a long time, has little environmental pollution, and has good economic benefits. Description of the Drawings

[0018] Figure 1 It is a graph of the removal rate of bisphenol A in the contaminated water bodies of Example 2 and Comparative Examples 1-4 of the present invention.

[0019] Figure 2 It is an SEM image of the cross-section of the CoNi-LDH-MXene film prepared in Example 2 of the present invention and its elemental mapping image. Detailed Embodiments

[0020] In order to make the technical means, creative features, achieved purposes and functions of the present invention clearer and easier to understand, the present invention will be further described below with reference to the drawings and specific embodiments.

[0021] Example 1: An application of a CoNi-LDH-MXene film disclosed in the present invention, in which the CoNi-LDH-MXene film is combined with peroxymonosulfate to treat a contaminated water body, and the pollutant in the contaminated water body is bisphenol A.

[0022] Specifically, after adding peroxymonosulfate to the contaminated water body at a concentration of 1 - 10 mg / mL, the dosage of peroxymonosulfate in the contaminated water body is 0.1 - 0.3 mol / L. Then, it passes through the CoNi-LDH-MXene film by a peristaltic pump and is filtered through a 0.22 μm Teflon membrane filter to remove the pollutants in the contaminated water body, and is analyzed by HPLC.

[0023] Example 2: An application of the CoNi-LDH-MXene film disclosed in the present invention. The difference from Example 1 is that the preparation method of the CoNi-LDH-MXene film includes S1 is the process of preparing a monolayer (few-layer) MXenes dispersion by reacting concentrated hydrochloric acid (12 mol / L HCl), lithium fluoride (LiF), and aluminum carbonitride (Ti 3 A1C 2 ) Among them, first add 20 mL of concentrated hydrochloric acid to a polytetrafluoroethylene reaction kettle, then slowly add 2 g of lithium fluoride, and stir with a magnetic stirrer until dissolved. Then slowly add 1 g of aluminum carbonitride and stir and react at 40 °C for 48 h to etch the aluminum carbonitride. After the etching is completed, centrifuge the reaction solution at 4000 r / min for 5 min, collect the precipitate, and wash it with dilute hydrochloric acid (1 mol / L HCl) to remove lithium fluoride. Centrifuge at 4000 r / min for 5 min and repeat several times until the supernatant is colorless and transparent. Then add pure water for washing, centrifuge at 4000 r / min for 5 min and repeat several times until the pH of the supernatant is 6.0. Collect the precipitate, add pure water for ultrasonic treatment, pass an inert gas and use an ice-water bath for protection. The ultrasonic time lasts for 2 h, and the ice bag is changed every 30 min. After the ultrasonic treatment is completed, centrifuge at 4000 r / min for 5 min to obtain a 3.52 g / L monolayer MXenes dispersion; S2 is the process of preparing CoNi-LDH powder by reacting cobalt nitrate (Co(NO 3 ) 2 ), nickel nitrate hexahydrate (Ni(NO 3 ) 3 ·6H 2 O) and urea; Among them, first add 0.58 g of cobalt nitrate and 0.58 g of nickel nitrate hexahydrate, then add a mixed solution of 10 mL of ethanol and 40 mL of deionized water, stir and mix for 30 min, then add 0.6 g of urea, and continue to stir for 30 min until dissolved. Then transfer the mixed solution to a stainless steel autoclave lined with polytetrafluoroethylene and put it into an oven, heat and react at 120 °C for 24 h. After the reaction is completed, centrifuge the reaction solution and the precipitate at 2000 r / min for 5 min, collect the precipitate, dry it in a vacuum oven at 60 °C for 12 h, and grind it to obtain CoNi-LDH powder; Process of preparing CoNi-LDH-MXene film by reacting single-layer MXenes dispersion with CoNi-LDH powder in S3.

[0024] Among them, first add 0.056 g of CoNi-LDH powder into 120 ml of pure water, ultrasonically disperse for 30 min, then add 40 mL of single-layer MXenes dispersion, stir and mix evenly, then extract 12 mL of the mixed solution and vacuum filter it on a PVDF microporous membrane to obtain the CoNi-LDH-MXene film.

[0025] Example 3: An application of the CoNi-LDH-MXene film disclosed in the present invention, which is different from Example 1 in that the preparation method of the CoNi-LDH-MXene film includes, Process of preparing single-layer (few-layer) MXenes dispersion in S1 by reacting concentrated hydrochloric acid (12 mol / L HCl), lithium fluoride (LiF) and aluminum carbonitride (Ti 3 A1C 2 ) Among them, first add 15 mL of concentrated hydrochloric acid into a polytetrafluoroethylene reaction kettle, then slowly add 1.5 g of lithium fluoride, and stir with a magnetic stirrer until dissolved, then slowly add 0.5 g of aluminum carbonitride, and stir and react at 30 °C for 45 h to etch the aluminum carbonitride. After the etching is completed, centrifuge the reaction solution at 3500 r / min for 4 min, collect the precipitate, and wash it with dilute hydrochloric acid (1 mol / L HCl) to remove lithium fluoride, centrifuge at 3500 r / min for 4 min, repeat multiple times until the supernatant is colorless and transparent, then add pure water for washing, centrifuge at 3500 r / min for 4 min, repeat multiple times until the pH of the supernatant is 5.5, collect the precipitate, and add pure water for ultrasonic treatment, pass inert gas and use an ice-water bath for protection, the ultrasonic time lasts for 1.5 h, change the ice bag every 25 min during this period, and after the ultrasonic treatment is completed, centrifuge at 3500 r / min for 4 min to obtain the single-layer MXenes dispersion; Process of preparing CoNi-LDH powder in S2 by reacting cobalt nitrate (Co(NO 3 )) 2 ), nickel nitrate hexahydrate (Ni(NO 3 )) 3 ·6H 2 O) and urea; Among them, first add 0.55 g of cobalt nitrate and 0.65 g of nickel nitrate hexahydrate, then add a mixed solution of 8 mL of ethanol and 35 mL of deionized water, stir and mix for 25 min, then add 0.5 g of urea, and continue to stir for 25 min until dissolved. Then transfer the mixed solution to a stainless steel autoclave lined with polytetrafluoroethylene, and put it into an oven, heat and react at 110 °C for 20 h. After the reaction, centrifuge the reaction solution and the precipitate at 1500 r / min for 4 min, collect the precipitate, dry it in a vacuum oven at 50 °C for 10 h, and obtain CoNi-LDH powder after grinding; S3 is the process of preparing CoNi-LDH-MXene film by reacting a monolayer MXenes dispersion and CoNi-LDH powder.

[0026] Among them, first add 0.050 - 0.060 g of CoNi-LDH powder to 100 ml of pure water, ultrasonically disperse for 30 min, then add 35 mL of monolayer MXenes dispersion, stir and mix evenly, then extract 10 mL of the mixed solution and vacuum filter it on a PVDF microporous membrane to obtain CoNi-LDH-MXene film.

[0027] Example 4: An application of the CoNi-LDH-MXene film disclosed in the present invention, which is different from Example 1 in that the preparation method of the CoNi-LDH-MXene film includes, S1 is the process of preparing a monolayer (few-layer) MXenes dispersion by reacting concentrated hydrochloric acid (12 mol / L HCl), lithium fluoride (LiF), and aluminum carbonitride (Ti 3 A1C 2 ) Among them, first add 25 mL of concentrated hydrochloric acid to a polytetrafluoroethylene reaction kettle, then slowly add 2.5 g of lithium fluoride, and stir with a magnetic stirrer until dissolved. Then slowly add 0.5 g of aluminum carbonitride, and stir and react at 30 °C for 45 h to etch the aluminum carbonitride. After the etching is completed, centrifuge the reaction solution at 4500 r / min for 6 min, collect the precipitate, and wash it with dilute hydrochloric acid (1 mol / L HCl) to remove lithium fluoride, centrifuge at 4500 r / min for 6 min, repeat multiple times until the supernatant is colorless and transparent. Then add pure water for washing, centrifuge at 4500 r / min for 6 min, repeat multiple times until the pH of the supernatant is 5.5. Collect the precipitate, add pure water for ultrasonic treatment, protect it by passing an inert gas and using an ice-water bath, the ultrasonic time lasts for 1.5 h, and change the ice bag every 25 min during this period. After the ultrasonic treatment is completed, centrifuge at 4500 r / min for 6 min to obtain a monolayer MXenes dispersion; S2 is from cobalt nitrate (Co(NO 3 ) 2 )、nickel nitrate hexahydrate (Ni(NO3 ) 3 ·6H 2 O) and urea to prepare CoNi-LDH powder; Among them, first add 0.65 g of cobalt nitrate and 0.55 g of nickel nitrate hexahydrate, then add a mixed solution of 12 mL of ethanol and 45 mL of deionized water, stir and mix for 35 min, then add 0.7 g of urea, continue to stir for 35 min until dissolved, then transfer the mixed solution to a stainless steel autoclave lined with polytetrafluoroethylene, and put it into an oven, heat and react at 130 °C for 30 h. After the reaction is completed, centrifuge the reaction solution and precipitate at 2500 r / min for 6 min, collect the precipitate, dry it in a vacuum oven at 70 °C for 15 h, and grind it to obtain CoNi-LDH powder; S3 is the process of preparing CoNi-LDH-MXene film by reacting a monolayer MXenes dispersion and CoNi-LDH powder.

[0028] Among them, first add 0.060 g of CoNi-LDH powder to 150 ml of pure water, ultrasonically disperse for 30 min, then add 45 mL of monolayer MXenes dispersion, stir and mix evenly, then extract 15 mL of the mixed solution and vacuum filter it on a PVDF microporous membrane to obtain CoNi-LDH-MXene film.

[0029] Comparative Example 1: An application of the CoNi-LDH-MXene film disclosed in the present invention, which is different from Example 2 in that in S3, it is not vacuum filtered into a film, that is, a CoNi-LDH-MXene mixed solution is used instead of the CoNi-LDH-MXene film, and the contaminated water body is treated in combination with peroxymonosulfate, and the pollutant in the contaminated water body is bisphenol A.

[0030] Comparative Example 2: An application of the CoNi-LDH-MXene film disclosed in the present invention, which is different from Comparative Example 1 in that PMS is not used, that is, the contaminated water body is treated only with the CoNi-LDH-MXene mixed solution, and the pollutant in the contaminated water body is bisphenol A..

[0031] Comparative Example 3: An application of the CoNi-LDH-MXene film disclosed in the present invention, which is different from Example 2 in that PMS is not used, that is, the contaminated water body is treated only with the CoNi-LDH-MXene film, and the pollutant in the contaminated water body is bisphenol A.

[0032] Comparative Example 4: An application of the CoNi-LDH-MXene film disclosed in the present invention. The difference from Example 2 is that the CoNi-LDH-MXene film is not used, that is, peroxymonosulfate is used alone to treat the polluted water body, and the pollutant in the polluted water body is bisphenol A.

[0033] Test Example 1: The water bodies treated by the methods of Example 2 and Comparative Examples 1-4 were detected to compare the removal effects of bisphenol A by different application methods. Figure 1 It shows the removal of bisphenol A under different working conditions.

[0034] Figure 1 It shows the removal of bisphenol A under different working conditions. As shown in the figure, the adsorption effects of pure PMS and CoNi-LDH-MXene powder for removing BPA are both very limited, with a removal ability of less than 10%. However, after adding PMS to the reaction system, the CoNi-LDH-MXene film can reach a removal rate of 99.9% for BPA at the beginning of the reaction. Although the reaction removal effect of CoNi-LDH-MXene powder is good, it requires at least 10 minutes of reaction time. At the same time, the adsorption capacity of the CoNi-LDH-MXene film is also limited, and it can still have a 20% adsorption capacity for removing bisphenol A after adsorption saturation.

[0035] Test Example 2: Microscopic detection was carried out on the CoNi-LDH-MXene film prepared in Example 2. Figure 2 It is the SEM image of the cross-section of the CoNi-LDH-MXene film material and the corresponding element mapping image. It is obvious in the image that the MXene nanosheets are electrostatically adsorbed on the surface of the CoNi-LDH nanospheres.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An application of a CoNi-LDH-MXene film, characterized in that: The CoNi-LDH-MXene film was combined with peroxymonosulfate to treat contaminated water, wherein the pollutant in the contaminated water was bisphenol A.

2. The use of a CoNi-LDH-MXene film according to claim 1, characterized in that: The preparation method of the CoNi-LDH-MXene film comprises: The process of preparing a monolayer MXenes dispersion by reacting concentrated hydrochloric acid, lithium fluoride and aluminum carbonitride; The process of preparing CoNi-LDH powder by reacting cobalt nitrate, nickel nitrate hexahydrate and urea; And, the process of preparing CoNi-LDH-MXene film by reacting single-layer MXenes dispersion and CoNi-LDH powder.

3. The use of a CoNi-LDH-MXene film according to claim 2, characterized in that: In the process of preparing the single-layer MXenes dispersion, 15-25 mL of concentrated hydrochloric acid is first added to a polytetrafluoroethylene reactor, and then 1.5-2.5 g of lithium fluoride is slowly added and stirred with a magnetic stirrer until dissolved, and then 0.5-1.5 g of aluminum carbonitride is slowly added, and the reaction is stirred at 30-50° C. for 45-50 hours, and the aluminum carbonitride is etched. After the etching is completed, the single-layer MXenes dispersion is obtained by post-treatment.

4. The use of a CoNi-LDH-MXene film according to claim 3, characterized in that: In the process of preparing the monolayer MXenes dispersion, after etching, the reaction solution is centrifuged at 3500-4500 r / min for 4-6 min, the precipitate is collected, and diluted hydrochloric acid (1 mol / L HCl) is added to wash and remove lithium fluoride, and centrifuged at 3500-4500 r / min for 4-6 min, which is repeated multiple times until the supernatant is colorless and transparent, then pure water is added for washing, and centrifuged at 3500-4500 r / min for 4-6 min, which is repeated multiple times until the pH of the supernatant is 5.5-6.5, the precipitate is collected, and pure water is added for ultrasonic treatment, inert gas is passed and an ice water bath is used for protection, the ultrasonic time lasts for 1.5-2.5 h, and the ice bag is changed every 25-35 min during this period. After the ultrasonic treatment, centrifuged at 3500-4500 r / min for 4-6 min to obtain a monolayer MXenes dispersion.

5. The use of a CoNi-LDH-MXene film according to claim 2, characterized in that: In the process of preparing the CoNi-LDH powder, 0.55-0.65 g of cobalt nitrate and 0.55-0.65 g of nickel nitrate hexahydrate are first added, and then a mixed solution of 8-12 mL of ethanol and 35-45 mL of deionized water is added, and the mixture is stirred for 25-35 minutes. Then, 0.5-0.7 g of urea is added, and stirring is continued for 25-35 minutes until it is dissolved. Then, the mixed solution is transferred to a stainless steel autoclave lined with polytetrafluoroethylene, and placed in an oven, and heated at 110-130° C. for reaction for 20-30 hours. After the reaction is completed, the CoNi-LDH powder is obtained by post-treatment.

6. The use of a CoNi-LDH-MXene film according to claim 5, characterized in that: In the process of preparing the CoNi-LDH powder, after the reaction is completed, the reaction solution and the precipitate are centrifuged at 1500-2500 r / min for 4-6 min, the precipitate is collected, dried in a vacuum oven at 50-70° C. for 10-15 h, and ground to obtain the CoNi-LDH powder.

7. The use of a CoNi-LDH-MXene film according to claim 2, characterized in that: In the process of preparing the CoNi-LDH-MXene film, 0.050-0.060 g of CoNi-LDH powder is first added to 100-150 ml of pure water, ultrasonically dispersed for 30 minutes, and then 35-45 ml of a single-layer MXene dispersion is added. After stirring and mixing, 10-15 ml of the mixed solution is extracted and vacuum filtered on a PVDF microporous filter membrane to obtain a CoNi-LDH-MXene film.

8. The use of a CoNi-LDH-MXene film according to claim 1, characterized in that: After the peroxymonosulfate is added to the contaminated water, it passes through the CoNi-LDH-MXene film through a peristaltic pump and is filtered through a 0.22 μm Teflon membrane filter to remove pollutants from the contaminated water.

9. The use of a CoNi-LDH-MXene film according to claim 8, characterized in that: The pollutant concentration of the polluted water body is 1-10 mg / mL.

10. The use of a CoNi-LDH-MXene film according to claim 9, characterized in that: The dosage of peroxymonosulfate in the polluted water body is 0.1-0.3 mol / L.

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