Persulfate advanced oxidation system, application of persulfate advanced oxidation system in degradation of acetaminophen and application method of persulfate advanced oxidation system

Abstract

The invention discloses a persulfate advanced oxidation system, application of the persulfate advanced oxidation system in degradation of acetaminophen and an application method of the persulfate advanced oxidation system. The persulfate advanced oxidation system comprises P-Fe and V2-MXene and PMS. Treating a to-be-treated object containing acetaminophen by adopting a system; the method comprises the following steps: adding the P-Fe and V2-MXene into the p-acetaminophen-containing wastewater, and adding PMS (Polymethyl Sulfonate) for reaction. According to the method, P-Fe and V2-MXene is adopted as a catalyst to activate PMS, Fe and V2-MXene have a strong synergistic effect, PMS can be efficiently activated, metal leaching is reduced through surface phosphorization, secondary pollution is prevented, the method has efficient PMS activation capacity, low energy consumption, low cost and anti-interference capacity, metal leaching is well reduced through surface phosphorization, and the method has a great application prospect in practical application and is suitable for industrial production. The paracetamol can be degraded in a short time, and the treatment requirement of paracetamol-containing sewage is met.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a persulfate advanced oxidation system and its application and application method in the degradation of acetaminophen. Background Technology

[0002] In recent years, acetaminophen (Acet) has been widely used as a drug effective in treating fever, inflammation, pain, and other ailments. However, due to the release of large amounts of Acet into the aquatic environment during production and human metabolism, it has become widespread in global waters, posing a significant water pollution problem for all humanity and causing considerable harm to human health and the ecological environment. Traditional wastewater treatment methods (such as biological methods and physical adsorption) are insufficient to completely degrade Acet; therefore, there is an urgent need for an efficient, safe, environmentally friendly, and economical Acet degradation technology.

[0003] Advanced oxidation processes (AOPs) based on persulfate (PMS) are widely used in water treatment and soil remediation due to the higher redox potential, longer half-life, and wider pH range of the sulfate radicals they generate. Iron is often used to activate PMS to degrade target pollutants; however, Fe2+ in solution is oxidized to Fe3+ after reacting with PMS and cannot be recycled, severely affecting pollutant degradation. Furthermore, secondary pollution caused by metal leaching to water bodies also limits the practical application of iron.

[0004] Therefore, providing a persulfate advanced oxidation system that has the advantages of high efficiency in activating PMS, low energy consumption, low cost and strong anti-interference ability, and meets the treatment requirements of wastewater containing acetaminophen, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a persulfate advanced oxidation system and its application and application method in the degradation of acetaminophen.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A persulfate advanced oxidation system comprising P-Fe@V2C-MXene and PMS.

[0008] Preferably, the P-Fe@V2C-MXene is any one of Fe, V2C-MXene, and P composite materials.

[0009] Preferably, the preparation method of P-Fe@V2C-MXene includes the following steps:

[0010] Step 1: Mix lithium fluoride with the first hydrochloric acid solution to prepare a mixed solution;

[0011] Step 2: Add V2AlC material to the mixed solution in Step 1, carry out the etching reaction in the reactor, perform the first centrifugation, wash the solid phase with the second hydrochloric acid solution, dry, and prepare V2C-MXene;

[0012] Step 3: Mix the V2C-MXene material from Step 2 with pure water to prepare a suspension;

[0013] Step 4: Mix FeCl2 with the V2C-MXene suspension from Step 3, perform continuous ultrasonic treatment, and then stir under nitrogen protection;

[0014] Step 5: Mix sodium borohydride with pure water to prepare a sodium borohydride solution;

[0015] Step 6: Add the sodium borohydride solution from Step 5 dropwise to the above suspension, stir slowly under nitrogen protection, centrifuge, rinse alternately with pure water and ethanol, and dry to prepare Fe@V2C-MXene;

[0016] Step 7: Place the Fe@V2C-MXene material and NaH2PO2 from Step 6 on the downstream and upstream sides of a tube furnace and calcine them under an argon atmosphere to prepare P-Fe@V2C-MXene.

[0017] Preferably, the molar concentration of the first hydrochloric acid solution is 6-12 mol / L;

[0018] The mass-to-volume ratio of lithium fluoride to the first hydrochloric acid solution is 1g:10-30mL;

[0019] The mass ratio of the V2AlC material to the lithium fluoride is 0.3-1:1;

[0020] The molar concentration of the second hydrochloric acid solution is 1-3 mol / L;

[0021] The mass-to-volume ratio of the V2C-MXene material to pure water is 1g:10-20mL;

[0022] The mass-to-volume ratio of FeCl2 to V2C-MXene suspension is 1g:8-32mL;

[0023] The mass-to-volume ratio of sodium borohydride to pure water is 1g:3-6mL;

[0024] The mass ratio of Fe@V2C-MXene material to NaH2PO2 is 1:20-30;

[0025] The conditions for mixing lithium fluoride with the first hydrochloric acid solution include: stirring at 300-800 rpm for 30-60 min;

[0026] The etching reaction conditions include: 90-120℃ for 72-144 hours;

[0027] The conditions for mixing the V2C-MXene material with pure water include: ultrasonic treatment for 30-60 minutes;

[0028] The conditions for mixing the FeCl2 and V2C-MXene suspension include: ultrasonic treatment for 30-60 min, and stirring at 300-800 rpm for 60-120 min under nitrogen protection.

[0029] The sodium borohydride solution was added dropwise to the above suspension, and under nitrogen protection, the conditions for slow stirring included: stirring at a speed of 100-300 rpm for 120-150 min;

[0030] The conditions for calcination in the tubular furnace include: heating the sample at 350-400℃ for 2-3 hours at a heating rate of 2-6℃ / min in an argon flow rate of 35-50 sccm.

[0031] Application of a persulfate advanced oxidation system in the degradation of acetaminophen.

[0032] A method for applying a persulfate advanced oxidation system in the degradation of acetaminophen, wherein the persulfate advanced oxidation system is used to treat a substance containing acetaminophen.

[0033] The substance to be treated containing acetaminophen includes wastewater containing acetaminophen.

[0034] Preferred, including:

[0035] The P-Fe@V2C-MXene described in any one of claims 1-4 is added to wastewater containing p-acetaminophen, and PMS is added to carry out the reaction.

[0036] Preferably, the mass-to-volume ratio of P-Fe@V2C-MXene to the wastewater containing p-acetaminophen is 1g:40-200mL;

[0037] The amount of PMS added to the wastewater containing acetaminophen is 0.1-0.2 mM;

[0038] The pH of the wastewater containing acetaminophen is 3-7.

[0039] The present invention achieves the following technical effects compared to the prior art:

[0040] (1) The persulfate advanced oxidation system of the present invention uses P-Fe@V2C-MXene prepared by iron doping V2C-MXene and phosphating as a catalyst to activate PMS. The synergistic effect between Fe and V2C-MXene efficiently activates PMS to degrade target pollutants.

[0041] In addition, surface phosphating effectively reduces metal leaching and has great application prospects in practical applications;

[0042] (2) The persulfate advanced oxidation system of the present invention produces active substances with higher redox potential, longer half-life and strong resistance to external interference.

[0043] In addition, this system has the advantages of high PMS utilization, low cost and easy operation. It can degrade acetaminophen in a short time and meet the treatment requirements of wastewater containing acetaminophen. Attached Figure Description

[0044] Figure 1 (a) is V2C-MXene of Example 1, (b) is P-Fe@V2C-MXene of Example 1, and (cf) is EDS diagram of P-Fe@V2C-MXene of Example 1;

[0045] Figure 2 (a) shows the degradation curves of Acet in different systems. Figure 2 (b) Metal leaching of iron and vanadium with different catalysts;

[0046] Figure 3 (a) shows the effect curve of P-Fe@V2C-MXene dosage on Acet degradation performance; Figure 3 (b) shows the effect curve of PMS dosage on the degradation performance of Acet;

[0047] Figure 4 The curve shows the effect of pH on the degradation performance of Acet. Detailed Implementation

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] In this invention, numerical intervals (i.e., numerical ranges) are involved. Unless otherwise specified, the distribution of selectable values ​​within a numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include numerical interval types such as percentage intervals, ratio intervals, and proportion intervals.

[0050] In this invention, the term "room temperature" generally refers to 4-35°C, and preferably 20±5°C. In embodiments of this invention, room temperature refers to 20-30°C.

[0051] In this invention, unless otherwise specified, the temperature parameters are allowed to be either constant-temperature treatment or vary within a certain temperature range. It should be understood that constant-temperature treatment allows temperature fluctuations within the precision range controlled by the instrument. Fluctuations are permitted within ranges such as ±5℃, ±4℃, ±3℃, ±2℃, and ±1℃.

[0052] In this invention, if the unit of a data range is only followed by the right endpoint, it indicates that the units of the left and right endpoints are the same. For example, 2-5h means that the units of the left endpoint "2" and the right endpoint "5" are both h (hours).

[0053] This invention discloses a persulfate advanced oxidation system, which includes P-Fe@V2C-MXene and PMS.

[0054] Advanced persulfate oxidation technology is mainly based on advanced oxidation techniques (AOPs) of persulfate (PMS). Because the sulfate radicals generated have higher redox potentials, longer half-lives, and wider pH ranges, it is widely used in water treatment.

[0055] Due to its low cost and environmental friendliness, iron is used as an iron source to activate PMS for the degradation of target pollutants. Fe in solution 2+ It is oxidized to Fe after reacting with PMS. 3+ This prevents the recycling of iron, severely impacting its efficient utilization. Two-dimensional transition metal carbides / nitrides MXene (M n+1 X nDue to its excellent hydrophilicity, superior electrical conductivity, and extremely low metal leaching rate, V2C is highly sought after by environmental workers and used in environmental remediation. Furthermore, its unique accordion morphology provides a large specific surface area, offering more attachment space for nanomaterials and providing more reactive sites. Compared to Ti3C2, V2C exhibits higher chemical activity, primarily due to its higher number of active sites per unit mass (fewer atomic layers in its structure; V2C has three atomic layers, while Ti3C2 has five), and the multiple oxidation states of the transition metal vanadium (+2, +3, +4, +5). Therefore, the multiple oxidation states of vanadium in V2C will affect Fe... 3+ Reduced to Fe 2+ This makes it possible. The strong synergistic effect of Fe and V2C-MXene will enable efficient activation of PMS, thereby achieving efficient degradation of Acet. In addition, metal leaching of the catalyst will cause secondary pollution to the treated water, which is not conducive to practical application. Therefore, phosphating treatment is performed on the Fe@V2C-MXene surface to reduce metal leaching.

[0056] P-Fe@V2C-MXene is any one of Fe, V2C-MXene, and P composite materials.

[0057] The preparation method of P-Fe@V2C-MXene includes the following steps:

[0058] Step 1: Mix lithium fluoride with the first hydrochloric acid solution to prepare a mixed solution;

[0059] Step 2: Add V2AlC material to the mixed solution in Step 1, carry out the etching reaction in the reactor, perform the first centrifugation, wash the solid phase with the second hydrochloric acid solution, dry, and prepare V2C-MXene;

[0060] Step 3: Mix the V2C-MXene material from Step 2 with pure water to prepare a suspension;

[0061] Step 4: Mix FeCl2 with the V2C-MXene suspension from Step 3, perform continuous ultrasonic treatment, and then stir under nitrogen protection;

[0062] Step 5: Mix sodium borohydride with pure water to prepare a sodium borohydride solution;

[0063] Step 6: Add the sodium borohydride solution from Step 5 dropwise to the above suspension, stir slowly under nitrogen protection, centrifuge, rinse alternately with pure water and ethanol, and dry to prepare Fe@V2C-MXene;

[0064] Step 7: Place the Fe@V2C-MXene material and NaH2PO2 from Step 6 on the downstream and upstream sides of a tube furnace and calcine them under an argon atmosphere to prepare P-Fe@V2C-MXene.

[0065] P-Fe@V2C-MXene was prepared by placing Fe@V2C-MXene material and NaH2PO2 on the downstream and upstream sides of a tube furnace and calcining them under an argon atmosphere.

[0066] The V2AlC material can be a commercially available product or prepared in-house.

[0067] The molar concentration of the first hydrochloric acid solution is 6-12 mol / L, specifically 6 mol / L, 7 mol / L, 8 mol / L, 9 mol / L, 10 mol / L, 11 mol / L, 12 mol / L, etc.

[0068] The mass-to-volume ratio of lithium fluoride to the first hydrochloric acid solution is 1g:(10-30)mL, specifically 1g:10mL, 1g:15mL, 1g:20mL, 1g:25mL, 1g:30mL, etc.

[0069] The mass ratio of V2AlC material to lithium fluoride is (0.3-1):1, specifically 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, etc.

[0070] The molar concentration of the second hydrochloric acid solution is 1-3 mol / L, specifically 1 mol / L, 1.5 mol / L, 2 mol / L, 2.5 mol / L, 3 mol / L, etc.

[0071] The mass-to-volume ratio of V2C-MXene material to pure water is 1g:(10-20)mL, specifically 1g:10mL, 1g:15mL, 1g:20mL, etc.

[0072] The mass-to-volume ratio of FeCl2 to V2C-MXene suspension is 1g:(8-32)mL, specifically 1g:8mL, 1g:16mL, 1g:24mL, 1g:32mL, etc.

[0073] The mass-volume ratio of sodium borohydride to pure water is 1g:(3-6)mL, specifically 1g:3mL, 1g:4mL, 1g:5mL, 1g:6mL, etc.

[0074] The mass ratio of Fe@V2C-MXene material to NaH2PO2 is 1:(20-30), specifically 1:20, 1:25, 1:30, etc.

[0075] The mixing conditions for lithium fluoride and the first hydrochloric acid solution include: stirring at a speed of 300-800 rpm for 30-60 minutes, with specific stirring speeds of 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, and 800 rpm; and specific stirring times of 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, and 60 minutes, etc.

[0076] The etching reaction conditions include: 90-120℃ for 72-144h, with specific temperatures including 90℃, 100℃, 110℃, and 120℃; and reaction times including 72h, 96h, 120h, and 144h.

[0077] The conditions for mixing V2C-MXene material with pure water include: ultrasonic treatment for 30-60 minutes, and the ultrasonic time can be 30 minutes, 40 minutes, 50 minutes, 60 minutes, etc.

[0078] The conditions for mixing FeCl2 with V2C-MXene suspension include: ultrasonic treatment for 30-60 min, stirring at 300-800 rpm for 60-120 min under nitrogen protection, and ultrasonic time can be 30 min, 40 min, 50 min, 60 min, etc.

[0079] The stirring speed can be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, or 800 rpm.

[0080] The stirring time can be 60 min, 80 min, 100 min, 120 min, etc.

[0081] Sodium borohydride solution is added dropwise to the above suspension. Under nitrogen protection, the stirring conditions include: stirring at a speed of 100-300 rpm for 120-150 min, where the specific stirring speed can be 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, etc.; and the stirring time can be 120 min, 130 min, 140 min, 150 min, etc.

[0082] The conditions for calcination in a tube furnace include: heating the sample at 350-400℃ for 2-3 hours at a heating rate of 2-6℃ / min in an argon flow rate of 35-50 sccm. The argon flow rate can be 35 sccm, 40 sccm, 45 sccm, 50 sccm, etc.

[0083] The heating rate can be 2℃ / min, 3℃ / min, 4℃ / min, 5℃ / min, etc.;

[0084] The heating temperature can be 350℃, 360℃, 370℃, 380℃, 390℃, 400℃, etc.;

[0085] The heating time can be 2 hours, 2.5 hours, or 3 hours.

[0086] This invention also discloses the application of a persulfate advanced oxidation system in the degradation of acetaminophen.

[0087] This invention also discloses a method for using a persulfate advanced oxidation system in the degradation of acetaminophen, wherein a persulfate advanced oxidation system is used to treat a substance containing acetaminophen.

[0088] Among them, the substances to be treated containing acetaminophen include wastewater containing acetaminophen.

[0089] Also includes:

[0090] P-Fe@V2C-MXene was added to wastewater containing p-acetaminophen, and PMS was added to carry out the reaction.

[0091] The mass-to-volume ratio of P-Fe@V2C-MXene to wastewater containing p-acetaminophen is 1g:(40-200)mL, specifically 1g:40mL, 1g:70mL, 1g:100mL, 1g:150mL, 1g:200mL, etc.

[0092] The dosage of PMS in wastewater containing acetaminophen is 0.1-0.2 mM, specifically 0.1 mM, 0.15 mM, 0.2 mM, etc.

[0093] The pH of wastewater containing acetaminophen is 3-7, specifically 3, 4, 5, 6, 7, etc.

[0094] Unless otherwise specified, the raw materials used in the following experiments are all commercially available. The following are exemplary descriptions of some of the raw materials used in the examples:

[0095] V2AlC was purchased from Jilin Yiyi Technology Co., Ltd., and FeCl2, NaBH4, and NaH2PO2 were purchased from Aladdin Reagent (Shanghai) Co., Ltd.

[0096] Example 1:

[0097] The specific steps for P-Fe@V2C-MXene are as follows:

[0098] 1) Prepare 6M hydrochloric acid solution and 3M hydrochloric acid solution;

[0099] 2) Slowly add 20 mL of 18 wt% HCl to 100 mL of polytetrafluoroethylene, then slowly add 2 g of LiF to the above hydrochloric acid and stir magnetically for 30 min;

[0100] 3) Slowly add 1g of V2AlC to the etching solution in step 2);

[0101] 4) Place polytetrafluoroethylene in a reaction vessel and react at 90°C for 120 h in a forced-air drying oven; after etching, centrifuge the solution from step 4) at 3500 rpm for 5 minutes, discard the supernatant, wash several times with the 3M hydrochloric acid solution from step 1), discard the supernatant, wash several times with water until pH≥6, and then freeze-dry to obtain V2C powder.

[0102] 5) Place 0.1g of V2C into a 100mL beaker and sonicate continuously in an ice bath for 30min;

[0103] 6) Add 12 mg FeCl2 to the V2C suspension in step 5); sonicate the mixture in step 6) in an ice bath for 30 min, and stir for 1 h under nitrogen protection;

[0104] 7) Under slow mechanical stirring and nitrogen purging, 18 mg NaBH4 was dissolved in 50 mL of deoxygenated deionized water. Sodium borohydride solution was added dropwise to the mixture in step 6). After slow stirring at room temperature for 2 h, the suspension obtained in step 7) was centrifuged to discard the supernatant. The suspension was then washed alternately with ethanol and pure water. The precipitate was then freeze-dried to obtain the Fe@V2C composite material.

[0105] 8) Place 50 mg Fe@V2C and 1 g NaH2PO2 from step 7) on the downstream and upstream sides of a tube furnace, respectively. Before heating, purge the tube furnace with argon for 1 h. Subsequently, heat the sample at 350 °C for 2 h at a heating rate of 2 °C / min in an Ar atmosphere (35 sccm) to obtain P-Fe@V2C-MXene;

[0106] The obtained SEM and EDS images of V2C and P-Fe@V2C-MXene are shown below. Figure 1 As shown.

[0107] Example 2:

[0108] Using P-Fe@V2C-MXene from Example 1 as a catalyst, PMS was activated to provide a persulfate advanced oxidation system, and its degradation performance on wastewater containing p-acetaminophen was studied.

[0109] Simulated wastewater with an initial Acet solution concentration of 0.5 mg / L was prepared to study the effects of P-Fe@V2C-MXene, Fe@V2C-MXene, P-V2C, P-Fe, and PMS on the degradation of Acet. In Example 1, the dosage of P-Fe@V2C-MXene was 15 mg / L, the dosage of PMS was 0.15 mM, and the reaction time was 30 min.

[0110] The pH of the wastewater was around 7 before the experiment.

[0111] After the experiment, the concentration of Acet was measured and the removal rate was calculated.

[0112] Removal rate calculation formula:

[0113] η=(C0-C e Equation (1) is: )×100 / C0;

[0114] In equation (1), η is the removal rate (%); C0, C e The values ​​represent the initial concentration of Acet before treatment and the concentration of Acet after treatment (mg / L), respectively.

[0115] The experimental results are as follows Figure 2 As shown in (a), A represents the degradation effect of Acet when PMS is added only; B represents the degradation effect of Acet when P-Fe@V2C-MXene is added only; C represents the degradation effect of Acet when P-Fe@V2C-MXene and PMS are added; D represents the degradation effect of Acet when Fe@V2C-MXene and PMS are added; E represents the degradation effect of Acet when P-V2C and PMS are added; and F represents the degradation effect of Acet when P-Fe and PMS are added.

[0116] like Figure 2 As shown in (b), A represents phosphated P-Fe@V2C-MXene; B represents unphosphated Fe@V2C-MXene.

[0117] from Figure 2 As shown in (a) and (b), Acet hardly degrades when PMS and P-Fe@V2C-MXene are used alone. Activating PMS with P-Fe@V2C-MXene and Fe@V2C-MXene can significantly improve the degradation rate of Acet.

[0118] Phosphated P-Fe@V2C-MXene exhibits lower iron and vanadium leaching compared to Fe@V2C-MXene.

[0119] Example 3:

[0120] Using P-Fe@V2C-MXene from Example 1 as a catalyst, PMS was activated to provide an advanced persulfate oxidation system. The optimal catalyst and PMS dosages were used to evaluate the performance of wastewater degradation of p-acetaminophen.

[0121] Prepare simulated wastewater with an initial concentration of 0.5 mg / L Acet solution, add the material prepared in Example 1, add 0.5, 1, 1.5, 2, and 2.5 mg of catalyst (100 mL of simulated wastewater), add 0.02, 0.05, 0.1, 0.15, and 0.2 mM PMS, and react for 30 min.

[0122] After the experiment, the concentration of Acet was measured and the degradation rate was calculated.

[0123] The experimental results are as follows Figure 3 As shown, it can be seen that the removal rate of Acet increases with the increase of the amount of catalyst and PMS. For P-Fe@V2C-MXene in Example 1, when the amount of catalyst added reaches 2 mg and the concentration of H2O2 reaches 0.2 mM, the degradation rate of Acet can reach 100%.

[0124] Example 4:

[0125] Using P-Fe@V2C-MXene from Example 1 as a catalyst, PMS was activated to provide a persulfate advanced oxidation system. The effects of initial Acet solution conditions such as pH on the degradation performance of Acet wastewater were investigated.

[0126] Simulated wastewater with an initial concentration of 0.5 mg / L Acet solution was prepared (pH adjusted to 3.2, 5.1, 7.5, 8.9), and 20 mg / L of the material prepared in Example 1 was added. 0.2 mM PMS was added, and the reaction was carried out for 30 min.

[0127] The experimental results are as follows Figure 4 As shown, the persulfate advanced oxidation system corresponding to Example 1 has a certain removal effect under conditions of pH 3-9. Among them, the removal rate under alkaline conditions is lower than that under acidic and neutral conditions, and the treatment effect is optimal when the initial pH of the Acet solution is 3.2.

[0128] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A persulfate advanced oxidation system, characterized in that, The system includes P-Fe@V2C-MXene and PMS.

2. The persulfate advanced oxidation system according to claim 1, characterized in that, The P-Fe@V2C-MXene is any one of Fe, V2C-MXene, and P composite materials.

3. The persulfate advanced oxidation system according to claim 1, characterized in that, The preparation method of the P-Fe@V2C-MXene includes the following steps: Step 1: Mix lithium fluoride with the first hydrochloric acid solution to prepare a mixed solution; Step 2: Add V2AlC material to the mixed solution in Step 1, carry out the etching reaction in the reactor, perform the first centrifugation, wash the solid phase with the second hydrochloric acid solution, dry, and prepare V2C-MXene; Step 3: Mix the V2C-MXene material from Step 2 with pure water to prepare a suspension; Step 4: Mix FeCl2 with the V2C-MXene suspension from Step 3, perform continuous ultrasonic treatment, and then stir under nitrogen protection; Step 5: Mix sodium borohydride with pure water to prepare a sodium borohydride solution; Step 6: Add the sodium borohydride solution from Step 5 dropwise to the above suspension, stir slowly under nitrogen protection, centrifuge, rinse alternately with pure water and ethanol, and dry to prepare Fe@V2C-MXene; Step 7: Place the Fe@V2C-MXene material and NaH2PO2 from Step 6 on the downstream and upstream sides of a tube furnace and calcine them under an argon atmosphere to prepare P-Fe@V2C-MXene.

4. The persulfate advanced oxidation system according to claim 3, characterized in that, The molar concentration of the first hydrochloric acid solution is 6-12 mol / L; The mass-to-volume ratio of lithium fluoride to the first hydrochloric acid solution is 1g:10-30mL; The mass ratio of the V2AlC material to the lithium fluoride is 0.3-1:1; The molar concentration of the second hydrochloric acid solution is 1-3 mol / L; The mass-to-volume ratio of the V2C-MXene material to pure water is 1g:10-20mL; The mass-to-volume ratio of FeCl2 to V2C-MXene suspension is 1g:8-32mL; The mass-to-volume ratio of sodium borohydride to pure water is 1g:3-6mL; The mass ratio of Fe@V2C-MXene material to NaH2PO2 is 1:20-30; The conditions for mixing lithium fluoride with the first hydrochloric acid solution include: stirring at 300-800 rpm for 30-60 min; The etching reaction conditions include: 90-120℃ for 72-144 hours; The conditions for mixing the V2C-MXene material with pure water include: ultrasonic treatment for 30-60 minutes; The conditions for mixing the FeCl2 and V2C-MXene suspension include: ultrasonic treatment for 30-60 min, and stirring at 300-800 rpm for 60-120 min under nitrogen protection. The sodium borohydride solution was added dropwise to the above suspension, and under nitrogen protection, the conditions for slow stirring included: stirring at a speed of 100-300 rpm for 120-150 min; The conditions for calcination in the tubular furnace include: heating the sample at 350-400℃ for 2-3 hours at a heating rate of 2-6℃ / min in an argon flow rate of 35-50 sccm.

5. The application of a persulfate advanced oxidation system according to any one of claims 1-4 in the degradation of acetaminophen.

6. A method for applying a persulfate advanced oxidation system in the degradation of acetaminophen, characterized in that, The persulfate advanced oxidation system according to any one of claims 1-4 is used to treat the substance containing acetaminophen; The substance to be treated containing acetaminophen includes wastewater containing acetaminophen.

7. The persulfate advanced oxidation system according to claim 6 and its application in the degradation of acetaminophen, characterized in that, include: The P-Fe@V2C-MXene described in any one of claims 1-4 is added to wastewater containing p-acetaminophen, and PMS is added to carry out the reaction.

8. The persulfate advanced oxidation system according to claim 6 and its application in the degradation of acetaminophen, characterized in that, The mass-to-volume ratio of P-Fe@V2C-MXene to the wastewater containing p-acetaminophen is 1g:40-200mL; The amount of PMS added to the wastewater containing acetaminophen is 0.1-0.2 mM; The pH of the wastewater containing acetaminophen is 3-7.

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