A Ce SA-MXene composite material, its preparation method and application

Abstract

The application discloses a Ce SA-MXene composite material and a preparation method and application thereof, the Ce SA-MXene composite material is formed by anchoring single-atom cerium on MXene, and the anchoring amount of the single-atom cerium accounts for 1-50 wt% of the total composite material; the preparation method comprises the following steps: adding cerium salt into a MXene suspension, fully mixing, filtering, washing and drying the obtained mixed solution, and then performing step-by-step calcination treatment, and the Ce SA-MXene composite material is obtained after the end of the step-by-step calcination treatment. The Ce SA-MXene composite material synthesized by the application has a large specific surface area, the metal cerium is dispersed in the form of atoms, the metal active sites are fully exposed, the reactivity and stability of the Ce SA-MXene composite material are enhanced by increasing the active sites, the Ce SA-MXene composite material is applied to the field of water pollution as a catalyst, can efficiently adsorb pollutants, such as artificial sweetener aspartame, can also realize recycling of the metal cerium, has the advantages of high catalytic efficiency, high use value, easy recycling and the like, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of metal single-atom and MXene composite materials, specifically to a Ce SA-MXene composite material, its preparation method, and its application. Background Technology

[0002] Aspartame (ASP), a typical artificial sweetener, suffers from long degradation times and is difficult to completely remove using traditional wastewater biological treatment processes. Therefore, advanced oxidation processes (AOPs) have been proposed as an effective alternative for aspartame degradation. In recent years, heterogeneous catalysts have gradually gained importance in the field of advanced oxidation due to their ease of recovery and reusability. Among them, single-atom catalysts (SACs) have attracted widespread attention in catalysis due to their significant catalytic activity and maximum atom utilization. SACs can not only maximize the utilization of active sites but also improve efficiency, reduce metal usage, and enhance catalytic selectivity in the conversion process. In the synthesis and application of single-atom catalysts, the interaction between individual atoms and the support is a key factor affecting their catalytic activity and stability.

[0003] Patent CN115060775A discloses a method for preparing MXene-supported gold nanoclusters composite material. The preparation process yields nanoclusters supported on MXene. However, this method has the drawbacks of incomplete metal site exposure and low metal utilization. Patent CN114335563A discloses a single-atom iron catalyst and its preparation method. It uses the Fe single-atom catalyst, which is currently the most studied. However, it has the technical problem of weak metal-support interaction, easy metal leaching, and secondary pollution. Summary of the Invention

[0004] Purpose of the invention: In order to solve the technical problems existing in the prior art, the present invention aims to provide a Ce SA-MXene composite material with fully exposed metal sites, high catalytic activity, strong metal-support interaction and good stability. The present invention also provides a method for preparing the Ce SA-MXene composite material and its application.

[0005] Technical solution: The Ce SA-MXene composite material of the present invention is formed by anchoring cerium atoms onto MXene, wherein the anchoring amount of cerium atoms accounts for 1-50 wt% of the total composite material, preferably, the anchoring amount of cerium atoms accounts for 12-50 wt% of the total composite material.

[0006] Furthermore, the MXene is a two-dimensional layered Ti3C2 structure.

[0007] The preparation method of CeSA-MXene composite material of the present invention includes the following steps: adding cerium salt to MXene suspension, mixing thoroughly, filtering, washing, drying and then performing stepwise calcination treatment on the resulting mixture, and finally obtaining CeSA-MXene composite material.

[0008] Further, the stepwise calcination specifically involves four steps of calcination in a nitrogen or argon atmosphere; wherein, the first step of calcination is carried out at a temperature of 150-200℃ for 0.6-0.8h; the second step of calcination is carried out at a temperature of 300-320℃ for 0.4-0.6h; the third step of calcination is carried out at a temperature of 500-520℃ for 0.4-0.6h; and the fourth step of calcination is carried out at a temperature of 600-650℃ for 1-2h.

[0009] Furthermore, the cerium salt is cerium nitrate hexahydrate or cerium chloride; the mass ratio of the cerium salt to MXene in the MXene suspension is 1:1-20.

[0010] Furthermore, the conditions for thorough mixing are: stirring for 2-5 hours, during which the Ce in the added cerium salt... 3+ It is electrostatically adsorbed by the end groups on the MXene surface.

[0011] Further, the MXene is Ti3C2, and the preparation method of the Ti3C2 suspension is as follows: Ti3AlC2 is added to a mixed solution of hydrofluoric acid and hydrochloric acid for etching reaction. After the reaction, the resulting black solution is centrifuged and washed to obtain a black solid. The black solid is dried to obtain a black powder, which is then dissolved in a solvent and ultrasonically treated to obtain a uniformly dispersed Ti3C2 suspension. In the mixed solution of hydrofluoric acid and hydrochloric acid, the volume ratio of hydrofluoric acid to hydrochloric acid is 3:4-5, and the concentration of hydrochloric acid is 10-12 mol / mL. The etching reaction conditions are: at room temperature, the stirring speed is 850-1000 r / min, and the stirring time is 20-30 h. The concentration of the Ti3C2 suspension is 1-15 mg / mL.

[0012] Further, the specific steps of centrifugation and washing are as follows: the black solution is first centrifuged at a speed of 3000-5000 r / min for 10-20 min, the supernatant is discarded and its pH is measured, the precipitate is washed several times with deionized water until the pH is greater than 5; then the supernatant after the last centrifugation is filtered and washed to collect the black solid.

[0013] Furthermore, the drying conditions are: vacuum drying at 80-90℃ for 6-10 hours.

[0014] Furthermore, the solvent is deionized water, and the ultrasonic treatment time is 30-60 minutes.

[0015] The application of the Ce SA-MXene composite material described in this invention as a catalyst in the degradation of aspartame in wastewater.

[0016] Further, the application steps are as follows: Ce SA-MXene composite material as a catalyst is added to wastewater containing aspartame, ultrasonically dispersed, and then potassium persulfate solution as an oxidant is added, followed by stirring to carry out the degradation reaction;

[0017] Furthermore, the concentration of the aspartame-containing wastewater is 10-50 mg / L, the concentration of the Ce SA-MXene composite material is 0.1-0.5 g / L, preferably 0.2-0.5 g / L, the concentration of the potassium persulfate solution is 1-4 mmol / L, preferably 4 mmol / L, and the degradation reaction time is 10-120 min, preferably 30-60 min.

[0018] Invention Principle: In this invention, a stepwise calcination method is used to anchor single-atom Ce onto Ti3C2: the first step of calcination removes impurity ions adsorbed on Ti vacancies, and the second step of calcination weakens Ce. 3+ The electrostatic adsorption of surface groups increases the number of Ti vacancies, and the third step of calcination utilizes the strong reducing power of Ti vacancies, Ce 3+ Ce is captured and reduced by nearby Ti vacancies, and the fourth step of calcination causes Ce to... 3+ Ce-C bonds are formed with surrounding C atoms, enhancing the interaction between the metal support and resulting in a stable structure. The subsequent four calcination steps further stabilize the Ce-C bond. 3+ Chemical bonds are formed between Ce and the support, ensuring that Ce is anchored as a single atom at the Ti vacancy in MXene. Without stepwise calcination, this could lead to Ce... 3+ The cerium dioxide nanoparticles are directly oxidized to form cerium dioxide nanoparticles instead of being captured and reduced by the Ti vacancies on Ti3C2, which affects their stability and catalytic performance.

[0019] Rare earth metal single-atom catalysts, due to the electronic properties and large radius of rare earth metals, exhibit strong metal-support interactions, making them more stable and longer-lasting than transition metal and noble metal-based catalysts. Among rare earth metals, Ce is the most abundant element, and like Fe, Ce exhibits significant redox coupling (Ce... 3+ / Ce 4+MXene exhibits an oxidation state transition between trivalent and tetravalent cerium. In the synthesis of single-atom catalysts, MXene is formed by etching MAX with an etchant, which strips away transition metal atoms, leaving highly reducing Ti vacancies—ideal sites for anchoring individual metal atoms. Simultaneously, the negatively charged surface groups on the MXene surface facilitate the electrostatic adsorption of metal precursors, thereby promoting the subsequent reduction and anchoring of individual metal atoms.

[0020] Therefore, MXene electrostatically adsorbs Ce 3+ On its surface, highly reducing Ti vacancy reduction anchors individual Ce. 3+ The synthesized CeSA-MXene composite material can effectively adsorb pollutants, increase metal active sites, enhance reactivity and stability, and stably and efficiently remove ASP, thus realizing the recycling of cerium.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0022] (1) The Ce SA-MXene composite material of the present invention anchors rare earth metal Ce single atoms on MXene, which has strong metal-carrier interaction, large specific surface area, multiple metal active sites, high reaction efficiency and strong stability. Experimental verification shows that the removal rate of aspartame by Ce SA-MXene composite material can be increased from 37% to 99% within 10-30 min of degradation, and the removal rate reaches 100% when the degradation is more than 30 min.

[0023] (2) This invention applies Ce SA-MXene composite material to the field of water pollution. Applying Ce SA-MXene composite material to the peroxymonosulfate activated degradation ASP system can achieve complete removal of ASP. During the treatment process, the reaction conditions are normal temperature and pressure, and there is no need to adjust the pH of the system. It is easy to operate and reduces the actual treatment cost. Attached Figure Description

[0024] Figure 1 SEM image of the Ce SA-MXene composite material prepared in Example 1;

[0025] Figure 2 The XRD patterns are of the Ce SA-MXene composite materials prepared in Examples 1, 2 and 3.

[0026] Figure 3 The graph shows the degradation effect of Example 1, Comparative Example 1, and Comparative Example 2 on aspartame wastewater.

[0027] Figure 4 The graph shows the degradation effect of aspartame wastewater in different systems in Application Example 4. Detailed Implementation

[0028] The present invention will now be further described in conjunction with specific embodiments and accompanying drawings.

[0029] Example 1: The Ce SA-MXene composite material provided in this example is formed by anchoring single-atom cerium onto MXene. The anchoring amount of single-atom cerium accounts for 12.61 wt% of the total composite material. The specific preparation method is as follows:

[0030] (1) In a 50 mL polytetrafluoroethylene beaker, 15 mL of hydrofluoric acid and 20 mL of 12 mol / L hydrochloric acid solution were mixed and mechanically stirred at 800 r / min for 5 min to obtain a clear mixed solution of hydrofluoric acid and hydrochloric acid.

[0031] (2) Weigh 3g of Ti3AlC2 powder and slowly add it to the beaker in step (1) several times. After no more bubbles are generated, adjust the reaction temperature to 25℃, set the speed to 850r / min, and stir continuously for 20h.

[0032] (3) Divide the black solution obtained in step (2) into two centrifuge tubes, centrifuge at 3000 r / min for 10 min using a high-speed centrifuge, discard the supernatant and measure its pH, wash the precipitate with deionized water several times until the pH is greater than 5.

[0033] (4) The supernatant after the last centrifugation in step (3) was filtered and washed, and the black solid was collected and dried under vacuum at 80°C for 6 hours to obtain black powder.

[0034] (5) Disperse 1.5g of the powder collected in step (4) in 100mL of ultrapure water and sonicate for 30min to prepare a Ti3C2 suspension of 15mg / mL.

[0035] (6) 1.5 g of cerium nitrate hexahydrate was added to the above Ti3C2 suspension and stirred for 2 h. The resulting mixed solution was filtered, washed, and vacuum dried at 80 °C for 6 h. The black powder was then placed in a vacuum tube furnace and heated sequentially to 200 °C, 300 °C, and 500 °C at 5 °C / min under an argon atmosphere, and held at each temperature for 0.5 h. The temperature was then further increased to 600 °C at 2 °C / min and held for 1 h. Finally, after the temperature of the tube furnace dropped to room temperature, the black powder sample was washed and vacuum dried at 80 °C for 6 h to obtain the black powder, which is the Ce SA-MXene composite material. The SEM image is shown below. Figure 1 As shown in the figure, the composite material retains the structural characteristics of MXene and has a large specific surface area. Ce SA is uniformly dispersed in the accordion-shaped Ti3C2T x The surface of MXene.

[0036] Application Example 1: This example provides the application of CeSA-MXene composite material. The CeSA-MXene composite material obtained in Example 1 is used as a catalyst for the degradation of aspartame in wastewater, as detailed below:

[0037] 1) Add 30 mg of Ce SA-MXene composite material as a catalyst to 100 mL of aspartame wastewater with a concentration of 50 mg / L, and sonicate for 2 min;

[0038] 2) Add 3 mmol / L potassium persulfate solution as an oxidant to the solution in step 1), and start the reaction with magnetic stirring. The removal rate of aspartame is 99% at room temperature for 30 min.

[0039] Example 2: The Ce SA-MXene composite material provided in this example is formed by anchoring single-atom cerium onto MXene. The anchoring amount of single-atom cerium accounts for 6.89 wt% of the total composite material. The specific preparation method is as follows:

[0040] (1) In a 50 mL polytetrafluoroethylene beaker, 15 mL of hydrofluoric acid and 20 mL of 12 mol / L hydrochloric acid solution were mixed and mechanically stirred at 800 r / min for 5 min to obtain a clear mixed solution of hydrofluoric acid and hydrochloric acid.

[0041] (2) Weigh 3g of Ti3AlC2 powder and slowly add it to the beaker in step (1) several times. After no more bubbles are generated, adjust the reaction temperature to 25℃, set the speed to 850r / min, and stir continuously for 20h.

[0042] (3) Divide the black solution obtained in step (2) into two centrifuge tubes, centrifuge at 3000 r / min for 10 min using a high-speed centrifuge, discard the supernatant and measure its pH, wash the precipitate with deionized water several times until the pH is greater than 5.

[0043] (4) The supernatant after the last centrifugation in step (3) was filtered and washed, and the black solid was collected and dried under vacuum at 80°C for 6 hours to obtain black powder.

[0044] (5) Disperse 400 mg of the powder collected in step (4) in 400 mL of ultrapure water and sonicate for 30 min to prepare a 1 mg / mL Ti3C2 suspension.

[0045] (6) 100 mg of cerium chloride was added to the above Ti3C2 suspension and stirred for 2 h. The resulting mixed solution was filtered, washed, and vacuum dried at 80 °C for 6 h. The black powder was then placed in a vacuum tube furnace and heated to 200 °C, 300 °C, and 500 °C sequentially at 5 °C / min under an argon atmosphere, and held at each temperature for 0.5 h. The temperature was then further increased to 600 °C at 2 °C / min and held for 1 h. Finally, after the temperature of the tube furnace dropped to room temperature, the black powder sample was washed and vacuum dried at 80 °C for 6 h to obtain the black powder, which is the Ce SA-MXene composite material.

[0046] Application Example 2: This example provides the application of CeSA-MXene composite material. The CeSA-MXene composite material obtained in Example 2 is used as a catalyst for the degradation of aspartame in wastewater, as detailed below:

[0047] 1) Add 30 mg of Ce SA-MXene composite material as a catalyst to 100 mL of aspartame wastewater with a concentration of 10 mg / L, and sonicate for 2 min;

[0048] 2) Add 2 mmol / L potassium persulfate solution as an oxidant to the solution in step 1), and start the reaction with magnetic stirring. The removal rate of aspartame is 79% after 120 min at room temperature.

[0049] Example 3: The Ce SA-MXene composite material provided in this example is formed by anchoring single-atom cerium onto MXene. The anchoring amount of single-atom cerium accounts for 1.73 wt% of the total composite material. The specific preparation method is as follows:

[0050] (1) In a 50 mL polytetrafluoroethylene beaker, 15 mL of hydrofluoric acid and 20 mL of 12 mol / L hydrochloric acid solution were mixed and mechanically stirred at 800 r / min for 5 min to obtain a clear mixed solution of hydrofluoric acid and hydrochloric acid.

[0051] (2) Weigh 3g of Ti3AlC2 powder and slowly add it to the beaker in step (1) several times. After no more bubbles are generated, adjust the reaction temperature to 25℃, set the speed to 850r / min, and stir continuously for 20h.

[0052] (3) Divide the black solution obtained in step (2) into two centrifuge tubes, centrifuge at 3000 r / min for 10 min using a high-speed centrifuge, discard the supernatant and measure its pH, wash the precipitate with deionized water several times until the pH is greater than 5.

[0053] (4) The supernatant after the last centrifugation in step (3) was filtered and washed, and the black solid was collected and dried under vacuum at 80°C for 6 hours to obtain black powder.

[0054] (5) Disperse 1g of the powder collected in step (4) in 100mL of ultrapure water and sonicate for 30min to prepare a Ti3C2 suspension of 10mg / mL.

[0055] (6) 50 mg of cerium nitrate hexahydrate was added to the above Ti3C2 suspension and stirred for 2 h. The resulting mixed solution was filtered, washed, and vacuum dried at 80 °C for 6 h. The black powder was then placed in a vacuum tube furnace and heated sequentially to 200 °C, 300 °C, and 500 °C at 5 °C / min under an argon atmosphere, and held at each temperature for 0.5 h. The temperature was then further increased to 600 °C at 2 °C / min and held for 1 h. Finally, after the temperature of the tube furnace dropped to room temperature, the black powder sample was washed and vacuum dried at 80 °C for 6 h to obtain the black powder, which is the Ce SA-MXene composite material.

[0056] Application Example 3: This example provides the application of the CeSA-MXene composite material. The CeSA-MXene composite material obtained in Example 3 is used as a catalyst for the degradation of aspartame in wastewater, as detailed below:

[0057] 1) Add 30 mg of Ce SA-MXene composite material as a catalyst to 100 mL of aspartame wastewater with a concentration of 10 mg / L, and sonicate for 2 min;

[0058] 2) Add 2 mmol / L potassium persulfate solution as an oxidant to the solution in step 1), and start the reaction with magnetic stirring. The removal rate of aspartame is 60% at room temperature for 120 min.

[0059] Figure 2 The XRD patterns of Ce SA-MXene composite materials prepared in Examples 1, 2 and 3 are shown. As can be seen from the figures, the composite materials have characteristic peaks of MXene and Ce. With the increase of Ce addition (from Example 3 to Example 1), the characteristic peak of MXene weakens and the characteristic peak of Ce strengthens, which proves the successful doping of Ce and shows that the composite materials retain the structural characteristics of MXene.

[0060] Comparative Example 1: This comparative example provides an MXene catalyst whose preparation method differs from that of Example 1 in that Ce(NO3)3·6H2O is not added in step (6).

[0061] The MXene catalyst prepared in Comparative Example 1 and the CeSA-MXene composite material prepared in Example 1 were each added in 100 mL of aspartame wastewater with a concentration of 10 mg / L, and 0.1 mol / L potassium persulfate solution was added. The reaction was carried out for 120 min, and the results were as follows. Figure 3 As shown, the removal rates of Comparative Example 1 and Example 1 were 53% and 98%, respectively. This indicates that the present invention, by doping Ce into MXene, increases the number of metal active sites, enhances reactivity, and improves catalytic performance.

[0062] Comparative Example 2: This comparative example provides a Ce SA-MXene composite material, the preparation method of which differs from that of Example 1 in that the calcination conditions are different: in step (6), the black powder is calcined in one step: under an argon atmosphere, the temperature is increased to 600℃ at 5℃ / min and held for 2h.

[0063] The CeSA-MXene composite materials prepared in Comparative Example 2 and Example 1 were each added in 100 mL of 10 mg / L aspartame wastewater, followed by 0.1 mol / L potassium persulfate solution. The reaction was carried out for 120 minutes, and the results were as follows. Figure 3 As shown, the removal rates of Comparative Example 2 and Example 1 were 79% and 98%, respectively. This indicates that the calcination conditions of the present invention allow CeSA to be fully anchored on MXene, further increasing the number of metal active sites and enhancing stability and catalytic performance.

[0064] Application Example 4: Investigating the degradation effect of aspartame wastewater in different systems.

[0065] Experimental group: The catalyst prepared in Example 1 of this invention has the best performance. Take 30 mg of Ce SA-MXene composite material prepared in Example 1 of this invention, add it to 100 mL of aspartame wastewater with a concentration of 10 mg / L, add 3 mmol / L potassium persulfate solution, and react for 120 min.

[0066] Control group 1: 100 mL of aspartame wastewater with a concentration of 10 mg / L was taken, without the addition of any catalyst or sodium persulfate solution, and everything else was the same as the experimental group;

[0067] Control group 2: 100 mL of aspartame wastewater with a concentration of 10 mg / L was taken, without adding any catalyst, and everything else was the same as the experimental group;

[0068] Control group 3: 100 mL of aspartame wastewater with a concentration of 10 mg / L was taken, without the addition of potassium persulfate solution, and all other aspects were the same as those of the experimental group.

[0069] The results are as follows Figure 3 As shown, the experimental group achieved a degradation efficiency of 98% for aspartame after 120 minutes, while the degradation efficiencies of control groups 1, 2, and 3 were 1.3%, 0%, and 2.11%, respectively. This indicates that the addition of both catalyst and peroxymonosulfate is indispensable in the entire system.

[0070] Application Example 5: The degradation effect of Ce SA-MXene composite material prepared in Example 1 on aspartame wastewater in different systems was investigated.

[0071] I. Effect of aspartame concentration on degradation efficiency

[0072] 30 mg of the Ce SA-MXene composite material prepared in Example 1 of this invention was added to 100 mL of aspartame wastewater with concentrations of 10, 20, 30, and 40 mg / L. A 0.1 mol / L potassium persulfate solution was added, and the reaction was carried out for 120 min. The results showed that when the aspartame concentration was 10, 20, 30, and 40 mg / L, the removal rates were 99%, 80%, 65%, and 62%, respectively.

[0073] II. Effect of Catalyst Dosage on Degradation Efficiency

[0074] 10 mg, 20 mg, 30 mg, 40 mg, and 50 mg of the Ce SA-MXene composite material prepared in Example 1 of the invention were added to 100 mL of aspartame wastewater with a concentration of 10 mg / L, and 0.1 mol / L potassium persulfate solution was added. The reaction was carried out for 120 min. The results showed that when the catalyst dosage was 10 mg, 20 mg, 30 mg, 40 mg, and 50 mg, the removal rates were 85%, 100%, 100%, 100%, and 100%, respectively.

[0075] III. Effect of potassium persulfate solution concentration on degradation efficiency

[0076] Take 30 mg of the Ce SA-MXene composite material prepared in Example 1 of this invention, add it to 100 mL of aspartame wastewater with a concentration of 10 mg / L, add 0.1 mol / L potassium persulfate, and react for 120 min. The results show that when the concentration of potassium persulfate solution is 1, 2, 3, and 4 mmol / L, the removal rates are 72%, 86%, 95%, and 96%, respectively.

Claims

1. A Ce SA-MXene composite material, characterized in that, The Ce SA-MXene composite material is formed by anchoring cerium atoms onto MXene, with the anchoring amount of cerium atoms accounting for 1-50 wt% of the total composite material. The preparation method of the Ce SA-MXene composite material includes the following steps: adding cerium salt to an MXene suspension, mixing thoroughly, filtering, washing, drying the resulting mixture, and then performing stepwise calcination treatment to obtain the Ce SA-MXene composite material; the stepwise calcination specifically involves four steps of calcination in a nitrogen or argon atmosphere; wherein, the first step of calcination is performed at a temperature of 150-200 ℃ for 0.6-0.8 h; the second step of calcination is performed at a temperature of 300-320 ℃ for 0.4-0.6 h; the third step of calcination is performed at a temperature of 500-520 ℃ for 0.4-0.6 h; and the fourth step of calcination is performed at a temperature of 600-650 ℃ for 1-2 h.

2. The Ce SA-MXene composite material according to claim 1, characterized in that, The MXene is a two-dimensional layered Ti3C2 structure.

3. The Ce SA-MXene composite material according to claim 1, characterized in that, The cerium salt is cerium nitrate hexahydrate or cerium chloride.

4. The Ce SA-MXene composite material according to claim 1, characterized in that, The mass ratio of the cerium salt to MXene in the MXene suspension is 1:1-20.

5. The Ce SA-MXene composite material according to claim 1, characterized in that, The MXene is Ti3C2, and the preparation method of the Ti3C2 suspension is as follows: Ti3AlC2 was added to a mixed solution of hydrofluoric acid and hydrochloric acid for etching. After the reaction, the resulting black solution was centrifuged and washed to obtain a black solid. The black solid was dried to obtain a black powder, which was then dissolved in a solvent and ultrasonically treated to obtain a uniformly dispersed Ti3C2 suspension. In the mixed solution of hydrofluoric acid and hydrochloric acid, the volume ratio of hydrofluoric acid to hydrochloric acid was 3:4-5, and the concentration of hydrochloric acid was 10-12 mol / mL. The etching reaction conditions were: at room temperature, a stirring speed of 850-1000 r / min, and stirring for 20-30 h. The concentration of the Ti3C2 suspension was 1-15 mg / mL.

6. The application of the Ce SA-MXene composite material of claim 1 as a catalyst in the degradation of aspartame in wastewater.

7. The application according to claim 6, characterized in that, The steps are as follows: Ce SA-MXene composite material as a catalyst is added to the aspartame-containing wastewater, ultrasonically dispersed, and then potassium persulfate solution as an oxidant is added, followed by stirring to carry out the degradation reaction.

8. The application according to claim 7, characterized in that, The concentration of the aspartame-containing wastewater is 10-50 mg / L, the concentration of CeSA-MXene composite material is 0.1-0.5 g / L, the concentration of potassium persulfate solution is 1-4 mmol / L, and the degradation reaction time is 10-120 min.

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