A method for degrading acetaminophen in water using PCN-224-activated persulfate.
The PCN-224 photocatalyst was used to activate persulfate, which solved the problems of high energy input and secondary pollution in the existing persulfate activation methods. This enabled the rapid and complete degradation of acetaminophen and is suitable for the efficient removal of acetaminophen from water.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2026-03-10
AI Technical Summary
Existing persulfate activation methods suffer from high energy input, secondary pollution, and susceptibility to interference from background water quality, making it difficult to effectively remove acetaminophen from water.
PCN-224 photocatalyst was used to activate persulfate. The PCN-224 photocatalyst was prepared by hydrothermal reaction using tetra(4-carboxyphenyl)porphyrin and zirconium oxychloride as raw materials. It was used to degrade acetaminophen in water. The abundant microporous and mesoporous structures and specific functional groups of PCN-224 can rapidly adsorb and activate persulfate, thereby achieving efficient degradation of acetaminophen.
It achieves 100% degradation of acetaminophen within 4 minutes. The method is simple, easy to operate, widely applicable, and has no risk of secondary pollution. It is suitable for the efficient removal of acetaminophen from water bodies.
Smart Images
Figure CN119349752B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of advanced oxidation treatment of environmental pollutants, specifically relating to a method for degrading acetaminophen in water by activating persulfate with PCN-224. Background Technology
[0002] Acetaminophen is a commonly used antipyretic and analgesic drug. Due to its high solubility and poor adsorption capacity, it is widely left in the aquatic environment. Wastewater containing acetaminophen and some of its degradation byproducts can pose a threat to aquatic life and the ecological environment, and may also harm embryos, infants, children, debilitated adults, and people sensitive to the drug. Therefore, developing technologies for the effective removal of acetaminophen is crucial.
[0003] Advanced persulfate-based oxidation processes have been widely used in the treatment of recalcitrant organic pollutants due to their simple operation and strong oxidizing power. Although persulfate itself is a strong oxidant, it cannot be directly used for the oxidative decomposition of organic matter; it usually requires an activation process. Common persulfate activation methods include transition metal activation, thermal activation, radiation activation, carbon-based material activation, alkali activation, and electro-activation. However, the high energy input, secondary pollution (unavoidable metal leaching), and inherent limitations of free radical activation pathways (susceptibility to interference from the water matrix in the environmental background) restrict the potential application of these PDS activation methods. Therefore, overcoming these challenges and obtaining a PCN-224 photocatalyst that is simple to process, easy to operate, has good removal efficiency, wide applicability, and no risk of secondary pollution is of great significance for achieving effective activation of persulfate to completely remove acetaminophen from water. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for degrading acetaminophen in water by activating persulfate with PCN-224, which is simple in process, convenient in operation, has good removal effect, wide applicability, and no risk of secondary pollution.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.
[0006] A method for degrading acetaminophen in water by activating persulfate with PCN-224, wherein the method utilizes PCN-224 photocatalyst to activate persulfate to degrade water containing acetaminophen; the PCN-224 photocatalyst is prepared by hydrothermal reaction of tetrakis(4-carboxyphenyl)porphyrin and zirconium oxychloride; the temperature of the hydrothermal reaction is 65℃~80℃.
[0007] In a further improvement to the above method, the mass ratio of tetra(4-carboxyphenyl)porphyrin to zirconium oxychloride is 7:20-30.
[0008] A further improvement to the above method, the preparation method of the PCN-224 photocatalyst includes the following steps:
[0009] S1. Zirconium oxychloride and N,N-dimethylformamide are mixed to obtain suspension A;
[0010] S2. Mix the suspension A obtained in step S1 with tetrakis(4-carboxyphenyl)porphyrin, add acetic acid, and obtain suspension B;
[0011] S3. The suspension B obtained in step S2 is subjected to a hydrothermal reaction to obtain the PCN-224 photocatalyst.
[0012] In a further improvement to the above method, in step S1, the ratio of zirconium oxychloride to N,N-dimethylformamide is 10mg to 15mg: 5mL, and the zirconium oxychloride is zirconium oxychloride octahydrate.
[0013] In a further improvement to the above method, in step S2, the ratio of tetra(4-carboxyphenyl)porphyrin to acetic acid is 7 mg: 2 mL to 3 mL.
[0014] In a further improvement to the above method, in step S1, the mixing time is 30 min to 60 min, and the mixing is carried out under stirring conditions;
[0015] In step S2, the mixing time is 10 min to 15 min, and the mixing is carried out under stirring conditions;
[0016] In step S3, the hydrothermal reaction time is 48h to 72h, and the hydrothermal reaction is followed by the following treatment: washing, drying and grinding the reaction product.
[0017] A further improvement to the above method is that the degradation treatment involves mixing PCN-224 photocatalyst with water containing acetaminophen, adding persulfate, and carrying out a degradation reaction under light conditions to complete the degradation of acetaminophen in the water.
[0018] In a further improvement to the above method, the ratio of the PCN-224 photocatalyst to the water containing acetaminophen is 0.05 g to 0.2 g: 1 L, and the ratio of the persulfate to the water containing acetaminophen is 0.25 mmol to 1 mmol: 1 L.
[0019] In a further improvement to the above method, the initial concentration of acetaminophen in the water containing acetaminophen is 2.5 mg / L to 20 mg / L, the initial pH value of the water containing acetaminophen is 3 to 9, and the persulfate is sodium persulfate.
[0020] In a further improvement to the above method, the initial pH value of the acetaminophen-containing water is 3-7, the mixing time is 30-60 minutes, the mixing is carried out under light-proof and stirring conditions, the degradation reaction time is 2-10 minutes, and the degradation reaction temperature is 10℃-30℃.
[0021] Compared with the prior art, the advantages of the present invention are as follows:
[0022] This invention provides a method for degrading acetaminophen in water using PCN-224 photocatalyst activated by persulfate. The PCN-224 photocatalyst is prepared from tetrakis(4-carboxyphenyl)porphyrin and zirconium oxychloride via a hydrothermal reaction at 65℃–80℃. The PCN-224 photocatalyst used in this invention possesses, on the one hand, abundant microporous and mesoporous structures, which not only facilitates the rapid adsorption of acetaminophen but also provides mass transfer channels for persulfate and reactive oxygen species, shortening the reaction distance between acetaminophen and reactive oxygen species and enhancing the activation effect on persulfate; on the other hand, the zirconium in the PCN-224 photocatalyst is converted into Zr... 4+ The carbon exists in an amorphous state and possesses abundant functional groups such as C=O and CN. These structures make the PCN-224 photocatalyst more conducive to the adsorption and degradation of acetaminophen, and it can rapidly activate persulfate, thereby ultimately achieving efficient and complete degradation of acetaminophen. The method of this invention can achieve 100% rapid degradation of acetaminophen within 4 minutes, and has advantages such as simple process, convenient operation, good removal effect, wide applicability, and no risk of secondary pollution. It has practical significance for the treatment of acetaminophen wastewater in the environment. Attached Figure Description
[0023] Figure 1 This is a SEM image of the PCN-224 photocatalyst prepared in Example 1 of the present invention.
[0024] Figure 2 This is a TEM image of the PCN-224 photocatalyst prepared in Example 1 of the present invention.
[0025] Figure 3 This is an elemental distribution diagram of the PCN-224 photocatalyst prepared in Example 1 of the present invention.
[0026] Figure 4 The image shows the XRD pattern of the PCN-224 photocatalyst prepared in Example 1 of this invention.
[0027] Figure 5 The image shows the UV-Vis spectrum of the PCN-224 photocatalyst prepared in Example 1 of this invention.
[0028] Figure 6 The image shows the XPS spectrum of the PCN-224 photocatalyst prepared in Example 1 of this invention.
[0029] Figure 7 The nitrogen adsorption-desorption curve and pore volume distribution diagram of the PCN-224 photocatalyst prepared in Example 1 of this invention are shown.
[0030] Figure 8 The graphs show the degradation effects of PCN-224 photocatalyst on acetaminophen in different reaction systems in Example 1 of this invention.
[0031] Figure 9 The graph shows the degradation effect of PCN-224 photocatalyst activated by the degradation of acetaminophen by persulfate under different catalyst addition amounts in Example 2 of the present invention.
[0032] Figure 10 This is a graph showing the degradation effect of PCN-224 photocatalyst on the degradation of acetaminophen by persulfate under different persulfate addition amounts in Example 3 of the present invention.
[0033] Figure 11 The graph shows the degradation effect of PCN-224 photocatalyst activated by persulfate on acetaminophen under different pH conditions in Example 4 of this invention.
[0034] Figure 12 This is a graph showing the degradation effect of PCN-224 photocatalyst activated by persulfate on acetaminophen under different ion interference conditions in Example 5 of the present invention. Detailed Implementation
[0035] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. All materials and instruments used in the following embodiments are commercially available.
[0036] Example 1:
[0037] A method for degrading acetaminophen in water using PCN-224 activated persulfate according to the present invention includes the following steps:
[0038] Weigh 10 mg of PCN-224 photocatalyst and add it to 100 mL of acetaminophen solution with a concentration of 3.1 mg / L (the initial pH of the solution is 5.8). Maintain the temperature at 25 °C using a low-temperature circulating water device and stir for 60 min under light-protected conditions to reach adsorption-desorption equilibrium. Then, add sodium persulfate (chemical formula: Na2S2O8) (PDS) to make the concentration of PDS in the system 0.5 mM. Under light conditions, carry out the catalytic degradation reaction for 4 min to complete the degradation of acetaminophen in the water.
[0039] Control group 1 (Vis): No PCN-224 or PDS added, all other conditions are the same.
[0040] Control group 2 (PDS): No PCN-224 added, no light exposure, all other conditions are the same.
[0041] Control group 3 (PDS / Vis): PCN-224 was not added, and all other conditions were the same.
[0042] Control group 4 (PCN-224 / PDS): No light exposure was applied; the catalytic degradation reaction was carried out directly under the same conditions.
[0043] Control group 5 (PCN-224 / Vis): PDS was not added, and all other conditions were the same.
[0044] In the catalytic degradation reaction, 1 mL of reaction solution was taken at time points of 0 min (adsorption 30 min), 0.5 min, 1 min, 1.5 min, 2 min, 2.5 min, 3 min, 3.5 min, and 4 min, filtered through a 0.22 μm filter, and added to a liquid chromatography vial containing 200 μL of 100 mM sodium thiosulfate solution. The concentration of acetaminophen in the solution was detected by liquid chromatography.
[0045] In this embodiment, the preparation method of the PCN-224 photocatalyst includes the following steps:
[0046] (1) Weigh 120 mg of zirconium oxychloride octahydrate and add it to 50 mL of N,N-dimethylformamide. Stir for 30 min to disperse and suspend it evenly to obtain suspension A.
[0047] (2) Add 35 mg of tetrakis(4-carboxyphenyl)porphyrin to the above suspension A, stir at 25 °C for 10 min, and then add 12.5 mL of acetic acid to obtain suspension B.
[0048] (3) The above suspension B was subjected to hydrothermal reaction at 65°C for 72 hours. After washing, drying and grinding, PCN-224 photocatalyst was obtained.
[0049] Figure 1 This is a SEM image of the PCN-224 photocatalyst prepared in Example 1 of this invention. Figure 1 As can be seen from the above, the PCN-224 photocatalyst of the present invention exhibits a roughly cubic crystal structure with a size distribution in the range of 3 to 5 micrometers.
[0050] Figure 2 This is a TEM image of the PCN-224 photocatalyst prepared in Example 1 of this invention. Figure 2 Clear lattice edges can be observed, with lattice fringes measured at 0.34 nm, which correspond well to the (002) crystal plane of PCN-224.
[0051] Figure 3 This is an elemental distribution diagram of the PCN-224 photocatalyst prepared in Example 1 of this invention. Figure 4 As can be seen from the data, C, O, N and Zr are evenly distributed, indicating that the PCN-224 photocatalyst has a good synthesis effect.
[0052] Figure 4 The image shows the XRD pattern of the PCN-224 photocatalyst prepared in Example 1 of this invention. Figure 5 It can be seen that the characteristic peaks of the PCN-224 photocatalyst of the present invention are consistent with the characteristic peaks of the standard PCN-224, indicating the successful synthesis of the PCN-224 photocatalyst.
[0053] Figure 5 This is the UV-Vis spectrum of the PCN-224 photocatalyst prepared in Example 1 of this invention. From... Figure 6 It is known that the PCN-224 photocatalyst has excellent photon absorption in the wavelength range of 250–720 nm, which enables the electrons of the PCN-224 photocatalyst to quickly enter the excited state under visible light irradiation.
[0054] Figure 6 The image shows the XPS spectrum of the PCN-224 photocatalyst prepared in Example 1 of this invention. Figure 7 It can be seen that, unlike the binding energy of metallic Zr (178.9 eV), Zr 3d has two peaks at 182.79 eV and 185.26 eV, which correspond to the 3d energy of tetravalent Zr, respectively. 3 / 2 and 3D 5 / 2 The binding energy indicates that zirconium in the PCN-224 photocatalyst of this invention is in the form of Zr. 4+ The state exists. In addition, three peaks were observed in C1s at 288.8, 286.21 and 284.8 eV, corresponding to C=O, CN and uncertain carbon (CC), respectively.
[0055] Figure 7This image shows the nitrogen adsorption-desorption curve and pore volume distribution of the PCN-224 photocatalyst prepared in Example 1 of this invention. Figure 7 It can be seen that the PCN-224 photocatalyst has abundant microporous and mesoporous structures, which not only facilitates the rapid adsorption of pollutants, but also provides mass transfer channels for persulfate and reactive oxygen species, shortens the reaction distance between micro-pollutants and reactive oxygen species, and enhances the activation effect on persulfate.
[0056] Figure 8 This image shows the degradation effect of PCN-224 photocatalyst on acetaminophen in different reaction systems in Example 1 of this invention. Figure 8 It can be seen that within 4 minutes, the degradation rate of acetaminophen in the Vis group, PDS group, and PDS / Vis group was almost zero; the PCN-224 / PDS / Vis system, after reaching adsorption equilibrium, could adsorb 3.32% of acetaminophen, and the degradation rate of acetaminophen was 100% after 4 minutes of degradation reaction. Therefore, under the conditions of initial pH 5.8, PDS concentration 0.5 mM, and photocatalyst dosage 0.1 g / L, the PCN-224 photocatalyst can degrade 100% of acetaminophen within 4 minutes, demonstrating excellent catalytic performance and the ability to efficiently activate persulfate to completely remove acetaminophen from water. Furthermore, the method of this invention uses a lower dose of oxidant, avoiding the problem of secondary pollution caused by excessive oxidant addition.
[0057] Example 2:
[0058] The effect of different catalyst dosages on the degradation of acetaminophen was investigated. Specifically, PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:
[0059] Weigh out 5 mg, 10 mg, 15 mg, and 20 mg of the PCN-224 photocatalyst from Example 1, and add them to 100 mL and 3.1 mg / L of acetaminophen solution (the initial pH of the solution is 5.8), respectively. Maintain the temperature at 25°C using a low-temperature circulating water device and stir for 60 min under light-protected conditions to reach adsorption-desorption equilibrium. Then, add sodium persulfate (PDS) to make the concentration of PDS in the system 0.5 mM. Under light conditions, carry out the catalytic degradation reaction for 4 min to complete the degradation of acetaminophen in the water.
[0060] Figure 9 This image shows the degradation effect of PCN-224 photocatalyst on the degradation of acetaminophen by persulfate under different catalyst addition amounts in Example 2 of this invention. Figure 9 It can be seen that the dosage of PCN-224 photocatalyst has a significant positive effect on the degradation of acetaminophen.
[0061] Example 3:
[0062] The effect of different persulfate addition amounts on the degradation of acetaminophen was investigated. Specifically, PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:
[0063] Four 10mg portions of the PCN-224 photocatalyst from Example 1 were weighed and added to 100mL and 5mg / L acetaminophen solutions respectively (the initial pH of the solution was 5.8). The temperature was maintained at 25°C using a low-temperature circulating water device, and the mixture was stirred for 60min under light-protected conditions to reach adsorption-desorption equilibrium. Then, sodium persulfate (PDS) was added to make the concentrations of PDS in the system 0.25mM, 0.5mM, 1mM and 1.5mM respectively. The catalytic degradation reaction was carried out for 4min under light conditions to complete the degradation of acetaminophen in the water.
[0064] Figure 10 This image shows the degradation effect of PCN-224 photocatalyst on acetaminophen degradation by persulfate under different persulfate addition amounts in Example 3 of this invention. Figure 10 It can be seen that when the amount of sodium persulfate increases from 0.25 mM to 1.5 mM, the degradation rate of acetaminophen shows a trend of first increasing and then decreasing. This may be attributed to the fact that excessive sodium persulfate reacts with SO42-. - The reaction reduces the number of active species that can be effectively degraded, thereby decreasing the degradation efficiency of acetaminophen.
[0065] Example 4:
[0066] The effect of different pH values on the degradation of acetaminophen was investigated. Specifically, PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:
[0067] Four 100 mL portions of acetaminophen solution (concentration 3.1 mg / L, initial pH 5.8) were taken. The pH values of the four acetaminophen solutions were adjusted to 3, 5, 7, and 9 respectively using 0.1 mol / L hydrochloric acid and sodium hydroxide solution. 10 mg of PCN-224 photocatalyst from Example 1 was added to each solution. The temperature was maintained at 25°C using a low-temperature circulating water device. The mixture was stirred for 60 min under light-protected conditions to reach adsorption-desorption equilibrium. Then, sodium persulfate (PDS) was added to make the concentration of PDS in the system 0.5 mM. The catalytic degradation reaction was carried out for 4 min under light conditions to complete the degradation of acetaminophen in the water.
[0068] Figure 11This image shows the degradation effect of PCN-224 photocatalyst on persulfate degradation of acetaminophen under different pH conditions in Example 4 of this invention. From... Figure 11 It can be seen that the removal rates of acetaminophen by the PCN-224 photocatalyst were 97.46%, 96.29%, 92.86%, and 73.19% respectively under pH conditions of 3, 5, 7, and 9. When the initial pH was adjusted to 3 and 5, the degradation rate of acetaminophen was almost unaffected; when the initial pH was increased to pH 7, the degradation rate of acetaminophen decreased slightly, but the effect was not significant; when the initial pH was increased to 9, the degradation rate of acetaminophen decreased by about 26%, which may be because at pH 9, both the PCN-224 photocatalyst and the acetaminophen molecule exhibit electronegativity, resulting in electrostatic repulsion and reducing the adsorption of acetaminophen on the photocatalyst. Therefore, the degradation system constructed by the PCN-224 photocatalyst and PDS in this invention has a wide pH range, and the degradation rate of acetaminophen can reach over 92% within a pH range of 3–7.
[0069] Example 5:
[0070] The effects of different ion interference conditions on the degradation of acetaminophen were investigated. Specifically, PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:
[0071] Five 10mg portions of PCN-224 photocatalyst from Example 1 were weighed and added to 100mL of 3.1mg / L acetaminophen solution (the initial pH of the solution was 5.8). The temperature was maintained at 25°C using a low-temperature circulating water device. Sodium humate, sodium bicarbonate, sodium sulfate, sodium chloride, and sodium nitrate were then added. The mixture was stirred for 60min under light-protected conditions to reach adsorption-desorption equilibrium. Then, sodium persulfate (PDS) was added to make the concentration of PDS in the system 0.5mM. The catalytic degradation reaction was carried out for 4min under light conditions to complete the degradation of acetaminophen in the water.
[0072] Figure 12 This image shows the degradation effect of PCN-224 photocatalyst activated on persulfate to degrade acetaminophen under different ion interference conditions in Example 5 of this invention. Figure 12 It can be seen that adding sodium bicarbonate (CO3) 2- When using sodium humate (HA), the degradation rates of acetaminophen were 51% and 56%, respectively, i.e., CO3. 2- The presence of HA inhibits the degradation performance of PCN-224 photocatalyst to some extent because: CO3 2-As a scavenger of superoxide radicals, HA reduces the number of active species in the degradation reaction system. The abundant hydroxyl and carboxyl groups on the HA surface compete with acetaminophen for these active species, thus lowering the degradation rate of acetaminophen. In contrast, the presence of SO4 in the degradation reaction system... 2- Cl - NO3 - When ions are present, the effect on the degradation rate of acetaminophen is relatively small.
[0073] In summary, the method of degrading acetaminophen in water by activating persulfate with PCN-224 according to the present invention has the advantages of simple process, convenient operation, high treatment efficiency, good removal effect, good reusability, wide applicability, and no risk of secondary pollution. It can achieve efficient and thorough removal of acetaminophen in water, has high use value, and good application prospects.
[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.
Claims
1. A method for degrading acetaminophen in an aqueous body using PCN-224-activated persulfate, characterized by, The method utilizes PCN-224 photocatalyst to activate persulfate to degrade and treat water containing acetaminophen; the PCN-224 photocatalyst is prepared by hydrothermal reaction of tetrakis(4-carboxyphenyl) porphyrin and zirconium oxychloride; the hydrothermal reaction is carried out at a temperature of 65-80℃. The degradation treatment is as follows: PCN-224 photocatalyst is mixed with water containing acetaminophen, persulfate is added, and the degradation reaction is carried out under light to complete the degradation of acetaminophen in the water; the ratio of PCN-224 photocatalyst to water containing acetaminophen is 0.05-0.2g:1L, and the ratio of persulfate to water containing acetaminophen is 0.25-1mmol:1L; the initial concentration of acetaminophen in the water containing acetaminophen is 2.5-20mg / L, and the persulfate is sodium persulfate.
2. The method of claim 1 for the degradation of acetaminophen in an aqueous body using PCN-224 activated persulfate, wherein, The mass ratio of tetrakis(4-carboxyphenyl) porphyrin to zirconium oxychloride is 7:20-30.
3. The method of claim 2 for the degradation of acetaminophen in an aqueous body using PCN-224 activated persulfate, wherein, The preparation method of the PCN-224 photocatalyst comprises the following steps: S1, mixing zirconium oxychloride and N,N-dimethylformamide to obtain suspension A; S2, mixing suspension A obtained in step S1 and tetrakis(4-carboxyphenyl) porphyrin, and adding acetic acid to obtain suspension B; S3, carrying out hydrothermal reaction on suspension B obtained in step S2 to obtain PCN-224 photocatalyst.
4. The method of claim 3, wherein the PCN-224 activates the persulfate salt to degrade acetaminophen in the water body. In step S1, the ratio of zirconium oxychloride to N,N-dimethylformamide is 10-15mg:5mL, and the zirconium oxychloride is zirconium oxychloride octahydrate.
5. The method of claim 4, wherein the PCN-224 activates persulfate salts to degrade acetaminophen in water. In step S2, the ratio of tetrakis(4-carboxyphenyl) porphyrin to acetic acid is 7mg:2-3mL.
6. The method of claim 5, wherein the PCN-224 activates persulfate salts to degrade acetaminophen in water. In step S1, the mixing time is 30-60min, and the mixing is carried out under stirring; In step S2, the mixing time is 10-15min, and the mixing is carried out under stirring; In step S3, the hydrothermal reaction time is 48-72h, and the treatment after the hydrothermal reaction further comprises the following steps: washing, drying and grinding the reaction product.
7. The method of degrading acetaminophen in water using PCN-224 activated persulfate according to any one of claims 1-6, wherein, The initial pH value of the water containing acetaminophen is 3-9.
8. The method of claim 7, wherein the PCN-224 activates persulfate salts to degrade acetaminophen in water. The initial pH value of the water containing acetaminophen is 3-7, the mixing time is 30-60min, the mixing is carried out under light shielding and stirring, the degradation reaction time is 2-10min, and the degradation reaction temperature is 10-30℃.