Method for degrading acetaminophen in water body by using PCN-224 to activate persulfate

Abstract

The invention discloses a method for degrading acetaminophen in a water body by utilizing PCN-224 to activate persulfate. According to the method, the water body containing acetaminophen is degraded by utilizing PCN-224 photocatalyst to activate persulfate. Wherein the PCN-224 photocatalyst is prepared by taking tetra (4-carboxyl phenyl) porphyrin and zirconium oxychloride as raw materials and carrying out hydrothermal reaction at 65-80 DEG C. The PCN-224 photocatalyst disclosed by the invention has abundant micropore and mesopore structures and abundant functional groups, so that not only is rapid adsorption of acetaminophen and rapid activation of persulfate facilitated, but also the activation effect of the persulfate can be enhanced, and finally efficient and thorough degradation of acetaminophen is realized. The method has the advantages of being simple in process, convenient to operate, good in removal effect, wide in application range, free of secondary pollution risk and the like, and has practical significance on acetaminophen wastewater treatment in the environment.

Description

Technical Field

[0001] The invention belongs to the field of advanced oxidation treatment of environmental pollutants, and specifically relates to a method for degrading acetaminophen in water by activating persulfate with PCN-224. Background Art

[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 water environment. Wastewater containing acetaminophen and some of its degradation byproducts may pose a threat to aquatic organisms and the ecological environment, and may also harm embryos, infants, children, frail adults, and people who are sensitive to drugs. Therefore, it is crucial to develop technologies that can effectively remove acetaminophen.

[0003] The advanced oxidation process based on persulfate has been widely used in the treatment of refractory organic pollutants due to its advantages of simple operation and strong oxidation ability. Although persulfate itself is a strong oxidant, it cannot be directly used for the oxidative decomposition of organic matter. It usually needs to undergo a certain activation process before it can be used for the oxidative decomposition of organic matter. Common persulfate activation methods include: transition metal activation, thermal activation, radiation activation, carbon-based material activation, alkali activation and electrical activation. However, high energy input, secondary pollution (inevitable metal leaching) and inherent defects of free radical activation pathways (susceptible to interference from water matrix in the environmental background) limit the potential application of the above-mentioned PDS activation method. Therefore, how to overcome the above-mentioned difficulties and obtain a PCN-224 photocatalyst with simple process, convenient operation, good removal effect, wide application range and no secondary pollution risk is of great significance for achieving effective activation of persulfate to completely remove acetaminophen in water. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for degrading acetaminophen in water by activating persulfate with PCN-224, which has the advantages of simple process, convenient operation, good removal effect, wide application range and no secondary pollution risk.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[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 acetaminophen-containing water; the PCN-224 photocatalyst is prepared by hydrothermal reaction with tetrakis(4-carboxyphenyl)porphyrin and zirconium oxychloride as raw materials; the temperature of the hydrothermal reaction is 65°C to 80°C.

[0007] The above method is further improved in that the mass ratio of tetrakis(4-carboxyphenyl)porphyrin to zirconium oxychloride is 7:20-30.

[0008] The above method is further improved, and the preparation method of the PCN-224 photocatalyst comprises the following steps:

[0009] S1. Mix zirconium oxychloride and N,N-dimethylformamide to obtain a suspension A;

[0010] S2, mixing the suspension A obtained in step S1 and tetrakis(4-carboxyphenyl)porphyrin, adding acetic acid, and obtaining a suspension B;

[0011] S3. Perform a hydrothermal reaction on the suspension B obtained in step S2 to obtain a PCN-224 photocatalyst.

[0012] The above method is further improved, in step S1, the ratio of the zirconium oxychloride to N,N-dimethylformamide is 10mg-15mg:5mL, and the zirconium oxychloride is zirconium oxychloride octahydrate.

[0013] The above method is further improved, in step S2, the ratio of tetrakis(4-carboxyphenyl)porphyrin to acetic acid is 7 mg: 2 mL to 3 mL.

[0014] The above method is further improved, in step S1, the mixing time is 30min to 60min, and the mixing is performed under stirring conditions;

[0015] In step S2, the mixing time is 10 min to 15 min, and the mixing is performed under stirring conditions;

[0016] In step S3, the hydrothermal reaction time is 48 hours to 72 hours, and the following treatments are also included after the hydrothermal reaction: washing, drying, and grinding the reaction product.

[0017] The above method is further improved, wherein the degradation treatment is as follows: mixing the PCN-224 photocatalyst with water containing acetaminophen, adding persulfate, and performing a degradation reaction under light conditions to complete the degradation of acetaminophen in the water.

[0018] The above method is further improved in that the ratio of the PCN-224 photocatalyst to the water containing acetaminophen is 0.05g-0.2g:1L, and the ratio of the persulfate to the water containing acetaminophen is 0.25mmol-1mmol:1L.

[0019] The above method is further improved in that the initial concentration of acetaminophen in the acetaminophen-containing water is 2.5 mg / L to 20 mg / L, the initial pH value of the acetaminophen water is 3 to 9, and the persulfate is sodium peroxydisulfate.

[0020] The above method is further improved, wherein the initial pH value of the acetaminophen water body is 3 to 7, the mixing time is 30 minutes to 60 minutes, the mixing is carried out under light-proof and stirring conditions, the degradation reaction time is 2 minutes to 10 minutes, and the degradation reaction temperature is 10°C to 30°C.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The present invention provides a method for degrading acetaminophen in water by activating persulfate with PCN-224. The PCN-224 photocatalyst is prepared by hydrothermal reaction at 65°C to 80°C with tetrakis(4-carboxyphenyl)porphyrin and zirconium oxychloride as raw materials. The PCN-224 photocatalyst used in the present invention has abundant micropores and mesopores, which is not only conducive to the rapid adsorption of acetaminophen, but also provides a mass transfer channel for persulfate and active oxygen, shortens the reaction distance between acetaminophen and active oxygen, and enhances the activation effect on persulfate. On the other hand, the zirconium in the PCN-224 photocatalyst is Zr 4+ The carbon exists in an amorphous state and has rich 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 can quickly activate persulfate, thereby ultimately achieving efficient and thorough degradation of acetaminophen. The method of the present invention can achieve 100% rapid degradation of acetaminophen within 4 minutes, has the advantages of simple process, convenient operation, good removal effect, wide application range, no secondary pollution risk, etc., and has practical significance for the treatment of acetaminophen wastewater in the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[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 the element distribution diagram of the PCN-224 photocatalyst prepared in Example 1 of the present invention.

[0026] Figure 4 This is the XRD diagram of the PCN-224 photocatalyst prepared in Example 1 of the present invention.

[0027] Figure 5 This is the UV-visible spectrum of the PCN-224 photocatalyst prepared in Example 1 of the present invention.

[0028] Figure 6 This is the XPS spectrum of the PCN-224 photocatalyst prepared in Example 1 of the present invention.

[0029] Figure 7 The nitrogen adsorption-desorption curve and pore volume distribution diagram of the PCN-224 photocatalyst prepared in Example 1 of the present invention.

[0030] Figure 8 This is a diagram showing the degradation effect of acetaminophen by the PCN-224 photocatalyst under different reaction systems in Example 1 of the present invention.

[0031] Fig. 9 This is a diagram showing the degradation effect of acetaminophen activated by persulfate with different catalyst addition amounts in Example 2 of the present invention.

[0032] Fig.10 This is a diagram showing the degradation effect of acetaminophen activated by persulfate using PCN-224 photocatalyst at different persulfate addition amounts in Example 3 of the present invention.

[0033] Fig.11 This is a diagram showing the degradation effect of acetaminophen by activating persulfate with the PCN-224 photocatalyst under different pH conditions in Example 4 of the present invention.

[0034] Fig.12 This is a diagram showing the degradation effect of acetaminophen by activating persulfate with the PCN-224 photocatalyst under different ion interference conditions in Example 5 of the present invention. DETAILED DESCRIPTION

[0035] 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.

[0036] Embodiment 1:

[0037] A method for degrading acetaminophen in water by activating persulfate with PCN-224 of the present invention comprises the following steps:

[0038] 10 mg of PCN-224 photocatalyst was weighed and added to 100 mL of 3.1 mg / 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. Under light-proof conditions, the mixture was stirred for 60 min to achieve adsorption-desorption equilibrium. Then, sodium peroxydisulfate (chemical formula: Na2S2O8) (PDS) was added to a concentration of 0.5 mM PDS in the system. Under light conditions, the catalytic degradation reaction was carried out for 4 min to complete the degradation of acetaminophen in the water.

[0039] Control group 1 (Vis): no PCN-224 or PDS was added, and other conditions were the same.

[0040] Control group 2 (PDS): no PCN-224 was added, no light was applied, and other conditions were the same.

[0041] Control group 3 (PDS / Vis): PCN-224 was not added, and other conditions were the same.

[0042] Control group 4 (PCN-224 / PDS): No light was applied, and the catalytic degradation reaction was directly carried out, and other conditions were the same.

[0043] Control group 5 (PCN-224 / Vis): PDS was not added, and other conditions were the same.

[0044] In the catalytic degradation reaction, 1 mL of the 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 with a 0.22 μm filter head, and added to a liquid vial containing 200 μL of 100 mM sodium thiosulfate solution, and the concentration of acetaminophen in the solution was detected by liquid chromatography.

[0045] In this embodiment, the preparation method of the PCN-224 photocatalyst used includes the following steps:

[0046] (1) Weigh 120 mg of zirconium oxychloride octahydrate, add it to 50 mL of N,N-dimethylformamide, and stir for 30 min to disperse it evenly to obtain a 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 suspension B was subjected to a hydrothermal reaction at 65° C. for 72 h, and then washed, dried, and ground to obtain a PCN-224 photocatalyst.

[0049] Figure 1 The SEM image of the PCN-224 photocatalyst prepared in Example 1 of the present invention is shown in FIG. Figure 1 It can be seen that the PCN-224 photocatalyst of the present invention presents a roughly cubic crystal structure, and the size distribution is in the range of 3 to 5 microns.

[0050] Figure 2 TEM image of the PCN-224 photocatalyst prepared in Example 1 of the present invention. Figure 2 Clear lattice edges can be observed in the lattice, and the lattice fringe is measured to be 0.34 nm, which corresponds well to the (002) crystal plane of PCN-224.

[0051] Figure 3 Element distribution diagram of PCN-224 photocatalyst prepared in Example 1 of the present invention. Figure 4 It can be seen that C, O, N and Zr are evenly distributed, indicating that the PCN-224 photocatalyst has a good synthesis effect.

[0052] Figure 4 The XRD pattern of the PCN-224 photocatalyst prepared in Example 1 of the present invention is shown in FIG. 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 that the PCN-224 photocatalyst was successfully synthesized.

[0053] Figure 5 The UV-Visible spectrum of the PCN-224 photocatalyst prepared in Example 1 of the present invention is shown in FIG. Figure 6 It can be seen that the PCN-224 photocatalyst has excellent photon absorption in the wavelength range of 250 to 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 XPS spectrum of the PCN-224 photocatalyst prepared in Example 1 of the present invention is shown in FIG. 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 of tetravalent Zr. 3 / 2 and 3D 5 / 2 This indicates that the zirconium in the PCN-224 photocatalyst of the present invention is Zr 4+ In addition, three peaks were observed at 288.8, 286.21 and 284.8 eV for C1s, corresponding to C=O, CN and adventitious carbon (CC), respectively.

[0055] Figure 7The nitrogen adsorption-desorption curve and pore volume distribution diagram of the PCN-224 photocatalyst prepared in Example 1 of the present invention are shown in FIG. Figure 7 It can be seen that the PCN-224 photocatalyst has abundant micropores and mesopores, which is not only conducive to the rapid adsorption of pollutants, but also provides a mass transfer channel for persulfate and reactive oxygen, shortens the reaction distance between micropollutants and reactive oxygen, and enhances the activation effect on persulfate.

[0056] Figure 8 The degradation effect of PCN-224 photocatalyst on acetaminophen in different reaction systems in Example 1 of the present invention is shown in FIG. 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 is almost zero; the PCN-224 / PDS / Vis system can adsorb 3.32% of acetaminophen after reaching adsorption equilibrium, and the degradation rate of acetaminophen is 100% when the degradation reaction is 4 minutes. It can be seen that under the conditions of initial pH of 5.8, PDS concentration of 0.5mM, and photocatalyst dosage of 0.1g / L, the PCN-224 photocatalyst can degrade 100% of acetaminophen within 4 minutes, that is, the PCN-224 photocatalyst shows excellent catalytic performance, and can efficiently activate persulfate to thoroughly remove acetaminophen in water. In addition, the method of the present invention uses a relatively low dose of oxidant to avoid the problem of secondary pollution caused by excessive addition of oxidant.

[0057] Embodiment 2:

[0058] The effects of different catalyst addition amounts on the degradation of acetaminophen were investigated. Specifically, the PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:

[0059] 5 mg, 10 mg, 15 mg, and 20 mg of the PCN-224 photocatalyst in Example 1 were weighed and added to 100 mL and 3.1 mg / L acetaminophen solution, respectively (the initial pH of the solution was 5.8). The temperature was maintained at 25 ° C using a low-temperature circulating water device. Under light-proof conditions, the mixture was stirred for 60 min to reach adsorption-desorption equilibrium. Then, sodium peroxydisulfate (PDS) was added so that the concentration of PDS in the system was 0.5 mM. Under light conditions, a catalytic degradation reaction was carried out for 4 min to complete the degradation of acetaminophen in the water.

[0060] Fig. 9 The following is a graph showing the degradation effect of acetaminophen by PCN-224 photocatalyst activated persulfate at different catalyst addition amounts in Example 2 of the present invention. Fig. 9 It can be seen that the dosage of PCN-224 photocatalyst has a significant positive effect on the degradation of acetaminophen.

[0061] Embodiment 3:

[0062] The effects of different amounts of persulfate added on the degradation of acetaminophen were investigated. Specifically, the PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:

[0063] Weigh 4 portions of 10 mg of the PCN-224 photocatalyst in Example 1, add them to 100 mL and 5 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, stir for 60 min under light-proof conditions, and reach adsorption-desorption equilibrium; then, add sodium persulfate (PDS) so that the concentration of PDS in the system is 0.25 mM, 0.5 mM, 1 mM and 1.5 mM, respectively, and carry out catalytic degradation reaction for 4 min under light conditions to complete the degradation of acetaminophen in the water.

[0064] Fig.10 The following is a graph showing the degradation effect of acetaminophen by PCN-224 photocatalyst activated persulfate at different persulfate addition amounts in Example 3 of the present invention. Fig.10 It can be seen that when the dosage of sodium persulfate increased from 0.25mM to 1.5mM, the degradation rate of acetaminophen showed a trend of first increasing and then decreasing, which may be attributed to the excessive sodium persulfate reacting with SO4 - reaction, resulting in a decrease in the number of active species that can be effectively degraded, thereby reducing the degradation efficiency of acetaminophen.

[0065] Embodiment 4:

[0066] The effect of different pH values ​​on the degradation of acetaminophen was investigated. Specifically, the PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:

[0067] Take 4 portions of 100mL acetaminophen solution (the concentration of the solution is 3.1mg / L, and the initial pH is 5.8), use 0.1mol / L hydrochloric acid and sodium hydroxide solution to adjust the pH values ​​of the 4 portions of acetaminophen solution to 3, 5, 7, and 9, respectively, add 10mg of the PCN-224 photocatalyst in Example 1, maintain the temperature at 25°C using a low-temperature circulating water device, stir for 60min under light-proof conditions, and reach adsorption-desorption equilibrium; then, add sodium persulfate (PDS) so that the concentration of PDS in the system is 0.5mM, and carry out catalytic degradation reaction for 4min under light conditions to complete the degradation of acetaminophen in the water.

[0068] Fig.11The following is a graph showing the degradation effect of acetaminophen by PCN-224 photocatalyst activated persulfate under different pH conditions in Example 4 of the present invention. Fig.11 It can be seen that under the conditions of pH values ​​of 3, 5, 7, and 9, the removal rates of acetaminophen by PCN-224 photocatalyst are 97.46%, 96.29%, 92.86%, and 73.19%, respectively. When the initial pH value is adjusted to 3 and 5, the degradation rate of acetaminophen is almost unaffected; when the initial pH value is increased to pH 7, the degradation rate of acetaminophen decreases slightly, but the effect is not significant; when the initial pH value is increased to 9, the degradation rate of acetaminophen decreases by about 26%, which may be because at pH 9, both the PCN-224 photocatalyst and the acetaminophen molecules show electronegativity, thereby generating electrostatic repulsion and reducing the adsorption of acetaminophen on the photocatalyst. It can be seen that the pH application range of the degradation system constructed by PCN-224 photocatalyst and PDS in the present invention is relatively wide, and the degradation rate of acetaminophen can reach more than 92% in the pH range of 3 to 7.

[0069] Embodiment 5:

[0070] The effects of different ion interference conditions on the degradation of acetaminophen were investigated. Specifically, the PCN-224 photocatalyst was used to activate persulfate to degrade acetaminophen in water, including the following steps:

[0071] Weigh 5 portions of 10 mg of the PCN-224 photocatalyst in Example 1, 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, then add sodium humate, sodium bicarbonate, sodium sulfate, sodium chloride and sodium nitrate, respectively, and stir for 60 min under light-proof conditions to reach adsorption-desorption equilibrium; then, add sodium persulfate (PDS) so that the concentration of PDS in the system is 0.5 mM, and carry out catalytic degradation reaction for 4 min under light conditions to complete the degradation of acetaminophen in the water.

[0072] Fig.12 This is a graph showing the degradation effect of acetaminophen by PCN-224 photocatalyst activated persulfate under different ion interference conditions in Example 5 of the present invention. Fig.12 It can be seen that adding sodium bicarbonate (CO3 2- ) and sodium humate (HA), the degradation rates of acetaminophen were 51% and 56% respectively, that is, CO3 2- The presence of CO3 and HA inhibits the degradation performance of PCN-224 photocatalyst to a certain extent. This is because: 2-As a scavenger of superoxide free radicals, it will reduce the active species in the degradation reaction system. The abundant hydroxyl and carboxyl groups on the surface of HA will compete with acetaminophen for the active species in the degradation reaction system, thereby reducing the degradation rate of acetaminophen. In contrast, the presence of SO4 2- , Cl - 、NO3 - ions, the effect on the degradation rate of acetaminophen is small.

[0073] In summary, the method of utilizing PCN-224 to activate persulfate to degrade acetaminophen in water has the advantages of simple process, convenient operation, high treatment efficiency, good removal effect, good reusability, wide application range, no secondary pollution risk, etc., and can achieve efficient and thorough removal of acetaminophen in water, with high use value and good application prospects.

[0074] 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 degrading acetaminophen in water by activating persulfate with PCN-224, characterized in that: The method utilizes PCN-224 photocatalyst to activate persulfate to degrade water containing acetaminophen; the PCN-224 photocatalyst is prepared by hydrothermal reaction with tetrakis(4-carboxyphenyl)porphyrin and zirconium oxychloride as raw materials; the temperature of the hydrothermal reaction is 65°C to 80°C.

2. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 1, characterized in that: The mass ratio of the tetrakis(4-carboxyphenyl)porphyrin to zirconium oxychloride is 7:20-30.

3. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 2, characterized in that: The preparation method of the PCN-224 photocatalyst comprises the following steps: S1. Mix zirconium oxychloride and N,N-dimethylformamide to obtain a suspension A; S2, mixing the suspension A obtained in step S1 and tetrakis(4-carboxyphenyl)porphyrin, adding acetic acid, and obtaining a suspension B; S3. Perform a hydrothermal reaction on the suspension B obtained in step S2 to obtain a PCN-224 photocatalyst.

4. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 3, characterized in that: In step S1, the ratio of the zirconium oxychloride to N,N-dimethylformamide is 10 mg to 15 mg: 5 mL, and the zirconium oxychloride is zirconium oxychloride octahydrate.

5. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 4, characterized in that: In step S2, the ratio of tetrakis(4-carboxyphenyl)porphyrin to acetic acid is 7 mg: 2 mL to 3 mL.

6. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 5, characterized in that: In step S1, the mixing time is 30 min to 60 min, and the mixing is performed under stirring conditions; In step S2, the mixing time is 10 min to 15 min, and the mixing is performed under stirring conditions; In step S3, the hydrothermal reaction time is 48 hours to 72 hours, and the following treatments are also included after the hydrothermal reaction: washing, drying, and grinding the reaction product.

7. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to any one of claims 1 to 6, characterized in that: The degradation treatment comprises: mixing the PCN-224 photocatalyst with water containing acetaminophen, adding persulfate, and performing a degradation reaction under light conditions to complete the degradation of acetaminophen in the water.

8. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 7, characterized in that: 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.

9. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 8, characterized in that: The initial concentration of acetaminophen in the acetaminophen-containing water body is 2.5 mg / L to 20 mg / L, the initial pH value of the acetaminophen-containing water body is 3 to 9, and the persulfate is sodium peroxydisulfate.

10. The method for degrading acetaminophen in water by activating persulfate with PCN-224 according to claim 9, characterized in that: The initial pH value of the acetaminophen water body 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°C-30°C.

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