MXene / phytic acid composite aerogel as well as preparation method and application thereof

Abstract

The application discloses MXene / phytic acid composite aerogel as well as a preparation method and application thereof, and belongs to the technical field of environmental materials.The MXene / phytic acid composite aerogel prepared by the application has a unique three-dimensional network structure and a high specific surface area, and provides abundant active sites for adsorption.Meanwhile, a large number of phosphoric acid groups in the phytic acid and functional groups on the surface of the MXene can be combined with uranyl ions and toxic agent simulant aerosol to have the effects of complexation, electrostatic adsorption and the like, so that the adsorption capacity and adsorption selectivity of the composite aerogel are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of environmental materials technology, and in particular relates to an MXene / phytic acid composite aerogel, its preparation method and application. Background Technology

[0002] Currently, commonly used adsorbents for the adsorption treatment of uranyl ions and toxic agent simulant aerosols include activated carbon, ion exchange resins, and clay minerals. Activated carbon exhibits poor adsorption selectivity and is difficult to regenerate; ion exchange resins have poor radiation resistance and are easily degraded in radioactive environments; and clay minerals have limited adsorption capacity, making them unsuitable for practical applications. Therefore, developing a highly efficient and multifunctional adsorbent to achieve simultaneous and efficient adsorption of uranyl ions and toxic agent simulant aerosols is of significant practical importance. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an MXene / phytic acid composite aerogel, its preparation method, and its applications. The composite aerogel prepared by this invention possesses a high specific surface area, abundant functional groups, and good stability. Furthermore, this composite aerogel is applied to adsorb toxic agent mimicry aerosols and uranyl ions, overcoming the shortcomings of existing adsorption materials such as low adsorption efficiency and limited functionality, thus achieving highly efficient removal of various pollutants.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for preparing MXene / phytic acid composite aerogel, comprising the following steps: adding a crosslinking agent to a mixed solution of MXene dispersion and phytic acid solution, stirring evenly and then transferring the mixture into a mold, and washing and drying after reaction to obtain the MXene / phytic acid composite aerogel.

[0005] Furthermore, the volume ratio of the MXene dispersion to the phytic acid solution is (1-3):1.

[0006] This invention employs an etching method to prepare MXene dispersions. The specific process is as follows: MAX phase material (such as Ti3AlC2) is added to a hydrochloric acid solution containing LiF, and the mixture is stirred at 35°C for 24 hours. Excess acid and impurities are removed through centrifugation and washing to obtain a multilayer MXene suspension. Then, the multilayer MXene suspension is ultrasonically treated to exfoliate it into single-layer MXene, thus obtaining the MXene dispersion.

[0007] Further, the concentration of the MXene dispersion is 2 mg / mL; the concentration of the phytic acid solution is 0.05-0.1 mol / L; and the molar ratio of the crosslinking agent to phytic acid is (0.8-1.7):1.

[0008] Furthermore, the crosslinking agent is calcium chloride.

[0009] Calcium chloride dissolves in water and dissociates to release Ca. 2+ On the one hand, Ca 2+ Ca undergoes polydentate chelate coordination with oxygen atoms of multiple phosphate groups on phytic acid molecules, bridging phytic acid molecules to form an organic three-dimensional network; on the other hand, Ca... 2+ It can coordinate and complex with polar functional groups such as hydroxyl groups and terminal oxygen groups on the surface of MXene, and achieve interfacial crosslinking between MXene sheets and phytic acid network.

[0010] Furthermore, the reaction temperature is 30-50°C.

[0011] Secondly, the present invention provides an MXene / phytic acid composite aerogel prepared by the preparation method described above.

[0012] Thirdly, the present invention provides an application of the MXene / phytic acid composite aerogel in the adsorption of uranyl ions.

[0013] Fourthly, the present invention provides an application of the MXene / phytic acid composite aerogel in the adsorption of chemical agent aerosols.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects: The MXene / phytic acid composite aerogel prepared by this invention possesses a unique three-dimensional network structure and high specific surface area, providing abundant active sites for adsorption. Simultaneously, the numerous phosphate groups in phytic acid and the functional groups on the surface of MXene can undergo complexation and electrostatic adsorption with uranyl ions and toxic agent aerosols, significantly improving the adsorption capacity and selectivity of the composite aerogel.

[0015] This invention utilizes a crosslinking agent to form a stable network structure between MXene and phytic acid, enabling the composite aerogel to exhibit good stability under different environmental conditions, resisting decomposition and detachment, and allowing for repeated use.

[0016] The MXene / phytic acid composite aerogel prepared in this invention exhibits excellent environmental adaptability. Its unique hierarchical porous structure effectively buffers the effects of humidity changes, showing minimal fluctuations in adsorption performance for toxic agent simulants within a relative humidity range of 10%-90%. Simultaneously, the material maintains structural integrity stably under atmospheric pressure environments of 0.5-1.5 atmospheres, ensuring stable adsorption treatment effects and greatly expanding the material's practical application scenarios. Long-term exposure and accelerated aging tests have verified that the material maintains stable performance under different environmental conditions and can maintain long-term effectiveness.

[0017] The preparation method of the present invention is simple to operate, and the required equipment and raw materials are readily available, making it suitable for large-scale industrial production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A scanning electron microscope image of the MXene / phytic acid composite aerogel prepared in Example 1; Figure 2 The nitrogen adsorption-desorption isotherm of the MXene / phytic acid composite aerogel prepared in Example 1; Figure 3 The adsorption performance test results of MXene / phytic acid composite aerogel prepared in Example 1 for uranyl ions and CEES are shown. Figure 4 The results of CEES adsorption performance tests of the MXene / phytic acid composite aerogel prepared in Example 1 under different humidity conditions are shown. Figure 5 The results show the CEES adsorption performance of the MXene / phytic acid composite aerogel prepared in Example 1 under different pressure conditions. Figure 6 The nitrogen adsorption-desorption isotherm of the MXene aerogel prepared in Comparative Example 1; Figure 7 The results show the adsorption performance of MXene aerogel prepared in Comparative Example 1 for uranyl ions and CEES. Figure 8 The nitrogen adsorption-desorption isotherm of the phytic acid aerogel in Comparative Example 2; Figure 9 The results show the adsorption performance of phytic acid aerogel prepared in Comparative Example 2 for uranyl ions and CEES. Detailed Implementation

[0020] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0021] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0022] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0023] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This specification and embodiments are merely exemplary.

[0024] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0025] This invention provides a method for preparing MXene / phytic acid composite aerogel, comprising the following steps: MXene dispersion is prepared by etching; MAX phase material (e.g., Ti3AlC2) is added to a hydrochloric acid solution containing LiF, and the mixture is stirred at 35°C for 24 hours; excess acid and impurities are removed by centrifugation and washing to obtain a multilayer MXene suspension. Then, the multilayer MXene suspension is ultrasonically treated to exfoliate it into a single layer of MXene, obtaining the MXene dispersion. Phytic acid is weighed and dissolved in deionized water to prepare a phytic acid solution with a concentration of 0.05-0.1 mol / L. The above MXene dispersion and phytic acid solution are mixed at a volume ratio of (1-3):1, stirred evenly, and then a crosslinking agent (e.g., calcium chloride, with a molar ratio of (0.8-1.7):1) is added, and stirring continues to form a homogeneous mixed solution. The mixed solution was transferred to a mold and reacted at 30-50℃ for 24 hours. The resulting composite hydrogel was repeatedly washed with deionized water to remove unreacted substances, and then dried by freeze-drying to obtain MXene / phytic acid composite aerogel.

[0026] This invention also provides an MXene / phytic acid composite aerogel prepared by the above preparation method.

[0027] This invention also provides the application of the above-mentioned MXene / phytic acid composite aerogel in the adsorption of uranyl ions. A uranyl ion solution was prepared, and the MXene / phytic acid composite aerogel was added to the solution. The mixture was kept at a constant temperature of 25°C and oscillated to study its adsorption performance for uranyl ions. The concentration of uranyl ions in the solution was detected by inductively coupled plasma mass spectrometry.

[0028] This invention provides an application of the MXene / phytic acid composite aerogel in the adsorption of toxic agent simulant aerosols. Adsorption experiments were conducted using the MXene / phytic acid composite aerogel on toxic agent simulant aerosols. The prepared MXene / phytic acid composite aerogel was shaped into specific forms (such as sheets or blocks) and placed in a sealed container containing a toxic agent simulant aerosol (such as 2-chloroethyl ethyl sulfide) to study its adsorption performance on the toxic agent simulant aerosol. The concentration of 2-chloroethyl ethyl sulfide in the container was detected by gas chromatography-mass spectrometry.

[0029] Unless otherwise specified, all materials used in this invention are commercially available products.

[0030] Example 1: A method for preparing MXene / phytic acid composite aerogel (1) Add 5g of Ti3AlC2 powder to 50mL of hydrochloric acid (6mol / L) containing 2g of LiF and stir at 35℃ for 24 hours. After the reaction, centrifuge (3500rpm, 20min) and wash (wash repeatedly with deionized water 3-5 times until the pH of the washing solution is close to neutral) to obtain a multilayer MXene suspension. Sonicate the multilayer MXene suspension for 4 hours, and after determining the actual concentration of MXene by dry weight determination, add an appropriate amount of deionized water to obtain an MXene dispersion with a concentration of 2mg / mL. (2) Weigh 3.5g of phytic acid and dissolve it in 100mL of deionized water to prepare a phytic acid solution with a concentration of 0.053mol / L; (3) Mix 50 mL of the MXene dispersion prepared in step (1) with 50 mL of the phytic acid solution prepared in step (2), stir until homogeneous, add 0.5 g of calcium chloride, and continue stirring for 30 minutes to form a homogeneous mixed solution. Transfer the mixed solution to a mold and react at 30 °C for 24 hours. Wash the resulting composite hydrogel repeatedly with deionized water three times, and then freeze-dry it to obtain the MXene / phytic acid composite aerogel.

[0031] Figure 1Scanning electron microscope image of the MXene / phytic acid composite aerogel prepared for Example 1. From Figure 1 As can be seen from Example 1, the material prepared has a rich porous structure.

[0032] Figure 2 The nitrogen adsorption-desorption isotherm of the MXene / phytic acid composite aerogel prepared in Example 1 is shown below. Figure 2 The nitrogen adsorption isotherm in the sample indicates that the specific surface area of ​​the material is 590 m². 2 g -1 .

[0033] Application Example 1 Adsorption of toxic agent simulants and uranyl ions by MXene / phytic acid composite aerogel.

[0034] The MXene / phytic acid composite aerogel prepared in Example 1 was made into a sheet. 0.1 g of the sheet composite aerogel was placed in a sealed container (0.1 m³) containing 2-chloroethyl ethyl sulfide aerosol (CEES) (initial concentration of 500 mg / m³) and adsorbed at 25 °C for 24 hours.

[0035] Prepare a uranyl ion solution with a concentration of 300 mg / L and adjust the pH of the solution to 5. Take 0.1 g of the MXene / phytic acid composite aerogel prepared in Example 1 and add it to 100 mL of uranyl ion solution, and shake at 25 °C for 24 hours.

[0036] Figure 3 The adsorption performance of the MXene / phytic acid composite aerogel prepared in Example 1 for uranyl ions and CEES was tested. The results showed that for uranyl ion adsorption, the initial uranyl concentration was 300 mg / L, the remaining concentration was 13 mg / L, the adsorption capacity was 287 mg / g, and the adsorption removal rate was 95.7%. For CEES adsorption, the concentration of the toxic agent simulant aerosol was 500 mg / m³ (container size 0.1 m³), ​​the remaining CEES concentration was 43 mg / m³, the adsorption capacity was 457 mg / g, and the adsorption removal rate was 91.4%.

[0037] The environmental adaptability of the MXene / phytic acid composite aerogel prepared in Example 1 was tested: the adsorption performance of the MXene / phytic acid composite aerogel on the aerosol of the toxic agent simulator was examined under humidity of 10%, 50%, and 90% and air pressure of 0.5, 1, and 1.5 standard atmospheres.

[0038] Figure 4The results show the CEES adsorption performance of the MXene / phytic acid composite aerogel prepared in Example 1 under different humidity conditions. The results indicate that at a relative humidity of 10%, the adsorption capacity is 448 mg / g with an adsorption removal rate of 89.6%; at a relative humidity of 50%, the adsorption capacity is 457 mg / g with an adsorption removal rate of 91.4%; and at a relative humidity of 90%, the adsorption capacity is 469 mg / g with an adsorption removal rate of 93.8%, showing relatively small fluctuations in adsorption performance.

[0039] Figure 5 The results show the CEES adsorption performance of the MXene / phytic acid composite aerogel prepared in Example 1 under different pressure conditions. The CEES adsorption experiments were repeated at 0.5, 1, and 1.5 standard atmospheres. The results show that at 0.5 standard atmospheres, the adsorption capacity was 446 mg / g, with an adsorption removal rate of 89.2%; at 1 standard atmosphere, the adsorption capacity was 457 mg / g, with an adsorption removal rate of 91.4%; and at 1.5 standard atmospheres, the adsorption capacity was 467 mg / g, with an adsorption removal rate of 93.4%. The material can stably perform its adsorption function.

[0040] Accelerated aging tests were conducted on the MXene / phytic acid composite aerogel prepared in Example 1 (temperature 50 °C, humidity 90%, placed for 7 days, simulating a 1-year usage environment); the specific surface area of ​​the composite aerogel after aging and its adsorption performance for toxic agent aerosols and uranyl ions were tested. The results showed that the specific surface area of ​​the composite aerogel after aging was 546 m². 2 g -1 When adsorbing uranyl ions, the initial uranyl concentration was 300 mg / L, the remaining concentration was 21 mg / L, the adsorption capacity was 279 mg / g, and the adsorption removal rate was 93%. When adsorbing CEES, the concentration of the toxic agent simulant aerosol was 500 mg / m³ (container size was 0.1 m³), ​​the remaining CEES concentration was 75 mg / m³, the adsorption capacity was 425 mg / g, and the adsorption removal rate was 85.0%.

[0041] Example 2 (1) Add 5g of Ti3AlC2 powder to 50mL of hydrochloric acid (6mol / L) containing 2g of LiF and stir at 35℃ for 24 hours. After the reaction, centrifuge (3500rpm, 20min) and wash (wash repeatedly with deionized water 3-5 times until the pH of the washing solution is close to neutral) to obtain a multilayer MXene suspension. Sonicate the multilayer MXene suspension for 4 hours, and after determining the actual concentration of MXene by dry weight determination, add an appropriate amount of deionized water to obtain an MXene dispersion with a concentration of 2mg / mL.

[0042] (2) Weigh 3.30g of phytic acid and dissolve it in 100mL of deionized water to prepare a phytic acid solution with a concentration of 0.050mol / L.

[0043] (3) Mix 60 mL of the MXene dispersion prepared in step (1) with 30 mL of the phytic acid solution prepared in step (2), stir until homogeneous, add 0.133 g of calcium chloride, and continue stirring for 30 minutes to form a homogeneous mixed solution. The volume ratio of the MXene dispersion to the phytic acid solution is 2:1, and the molar ratio of the crosslinking agent to phytic acid is 0.8:1. Transfer the mixed solution to a mold and react at 40°C for 24 hours. Wash the resulting composite hydrogel repeatedly with deionized water three times, and then freeze-dry it to obtain the MXene / phytic acid composite aerogel.

[0044] Tests showed that the MXene / phytic acid composite aerogel prepared in Example 2 had a rich pore structure and a specific surface area of ​​562 m² / g.

[0045] Application Example 2 The MXene / phytic acid composite aerogel prepared in Example 2 was made into a sheet. 0.1g of the sheet composite aerogel was placed in a sealed container (0.1m³) containing 2-chloroethyl ethyl sulfide aerosol (CEES) (initial concentration of 500mg / m³) and adsorbed at 25°C for 24 hours.

[0046] Prepare a uranyl ion solution with a concentration of 300 mg / L and adjust the pH of the solution to 5. Add 0.1 g of the MXene / phytic acid composite aerogel prepared in Example 2 to 100 mL of the uranyl ion solution and shake at 25 °C for 24 hours.

[0047] The results showed that when adsorbing uranyl ions, the initial uranyl concentration was 300 mg / L, the remaining concentration was 26 mg / L, the adsorption capacity was 274 mg / g, and the adsorption removal rate was 91.3%. When adsorbing CEES, the concentration of the toxic agent simulant aerosol was 500 mg / m³ (container size was 0.1 m³), ​​the remaining CEES concentration was 61 mg / m³, the adsorption capacity was 439 mg / g, and the adsorption removal rate was 87.8%.

[0048] Example 3 (1) Add 5g of Ti3AlC2 powder to 50mL of hydrochloric acid (6mol / L) containing 2g of LiF and stir at 35℃ for 24 hours. After the reaction, centrifuge (3500rpm, 20min) and wash (wash repeatedly with deionized water 3-5 times until the pH of the washing solution is close to neutral) to obtain a multilayer MXene suspension. Sonicate the multilayer MXene suspension for 4 hours, and after determining the actual concentration of MXene by dry weight determination, add an appropriate amount of deionized water to obtain an MXene dispersion with a concentration of 2mg / mL.

[0049] (2) Weigh 6.60g of phytic acid and dissolve it in 100mL of deionized water to prepare a phytic acid solution with a concentration of 0.10mol / L.

[0050] (3) Mix 75 mL of the MXene dispersion prepared in step (1) with 25 mL of the phytic acid solution prepared in step (2), stir until homogeneous, add 0.333 g of calcium chloride, and continue stirring for 30 minutes to form a homogeneous mixed solution. The volume ratio of the MXene dispersion to the phytic acid solution is 3:1, and the molar ratio of the crosslinking agent to phytic acid is 1.2:1. Transfer the mixed solution to a mold and react at 50°C for 24 hours. Wash the resulting composite hydrogel repeatedly with deionized water three times, and then freeze-dry it to obtain the MXene / phytic acid composite aerogel.

[0051] Testing showed that the MXene / phytic acid composite aerogel prepared in Example 3 possessed a stable three-dimensional network structure and a specific surface area of ​​578 m². 2 / g.

[0052] Application Example 3 The MXene / phytic acid composite aerogel prepared in Example 3 was made into sheets. 0.1 g of the sheet-like composite aerogel was placed in a solution containing 2-chloroethyl ethyl sulfide aerosol (CEES) (initial concentration 500 mg / m³). 3 In a sealed container (the container size is 0.1m) 3 ), adsorbed at 25℃ for 24 hours.

[0053] Prepare a uranyl ion solution with a concentration of 300 mg / L and adjust the pH of the solution to 5. Add 0.1 g of the MXene / phytic acid composite aerogel prepared in Example 3 to 100 mL of the uranyl ion solution and shake at 25 °C for 24 hours.

[0054] Measurements showed that for uranyl ion adsorption, the initial uranyl concentration was 300 mg / L, the remaining concentration was 11 mg / L, the adsorption capacity was 289 mg / g, and the adsorption removal rate was 96.3%. For CEES adsorption, the concentration of the toxic agent simulant aerosol was 500 mg / m³ (container size 0.1 m). 3 The remaining CEES concentration was 38 mg / m³, the adsorption capacity was 462 mg / g, and the adsorption removal rate was 92.4%.

[0055] Comparative Example 1 (1) Add 5g of Ti3AlC2 powder to 50mL of hydrochloric acid (6mol / L) containing 2g of LiF, and stir at 35℃ for 24 hours. After the reaction, centrifuge (3500rpm, 20min) and wash (wash repeatedly with deionized water 3-5 times until the pH of the washing solution is close to neutral) to obtain a multilayer MXene suspension. Sonicate the multilayer MXene suspension for 4 hours to obtain an MXene dispersion with a concentration of 2mg / mL; (2) Add 0.5g of calcium chloride to 100mL of the MXene dispersion prepared in step (1) and continue stirring for 30 minutes to form a uniform mixed solution. Transfer the mixed solution to a mold and react at 30℃ for 24 hours. Wash the resulting composite hydrogel repeatedly with deionized water 3 times, and then dry it by freeze drying to obtain MXene aerogel.

[0056] Figure 6 The nitrogen adsorption-desorption isotherm of the MXene aerogel prepared in Comparative Example 1 is shown below. Figure 6 The nitrogen adsorption isotherm in the sample indicates that the specific surface area of ​​the material is 55 m². 2 g -1 .

[0057] Comparative Application Example 1 Adsorption of toxic agent simulants and uranyl ions by MXene aerogel.

[0058] The MXene aerogel prepared in Comparative Example 1 was made into a sheet. 0.1 g of the sheet aerogel was placed in a sealed container (0.1 m³) containing 2-chloroethyl ethyl sulfide aerosol (CEES) (initial concentration of 500 mg / m³) and adsorbed at 25 °C for 24 hours.

[0059] 0.1 g of MXene aerogel was added to 100 mL of a uranyl ion solution with a concentration of 300 mg / L and a pH of 5, and the solution was kept at 25 °C with shaking for 24 hours. The adsorption capacity of MXene aerogel for uranyl ions was calculated, and the results showed that the adsorption capacity was 176 mg / g.

[0060] Figure 7The results show the adsorption performance of the MXene aerogel prepared in Comparative Example 1 for uranyl ions and CEES. The initial uranyl concentration was 300 mg / L, the remaining concentration was 124 mg / L, the adsorption capacity was 176 mg / g, and the adsorption removal rate was 58.7%. For CEES adsorption, the concentration of the toxic agent simulant aerosol was 500 mg / m³ (container size 0.1 m³), ​​the remaining CEES concentration was 206 mg / m³, the adsorption capacity was 294 mg / g, and the adsorption removal rate was 58.8%.

[0061] Comparative Example 2 (1) Weigh 3.5g of phytic acid and dissolve it in 100mL of deionized water to prepare a phytic acid solution with a concentration of 0.053mol / L; (2) Add 0.5g of calcium chloride to 100mL of the phytic acid solution prepared in step (1) and continue stirring for 30 minutes to form a homogeneous mixed solution. Transfer the mixed solution to a mold and react at 30℃ for 24 hours. Wash the resulting hydrogel repeatedly with deionized water 3 times, and then freeze-dry it to obtain phytic acid aerogel.

[0062] Figure 8 The nitrogen adsorption-desorption isotherm of the phytic acid aerogel in Comparative Example 2 is shown below. Figure 8 The nitrogen adsorption isotherm in the sample indicates that the specific surface area of ​​the material is 162 m². 2 g -1 .

[0063] Comparative Application Example 2 Phytic acid aerogel adsorption of toxic agent simulants aerosols and uranyl ions.

[0064] The phytic acid aerogel prepared in Comparative Example 2 was made into a sheet. 0.1 g of the sheet aerogel was placed in a sealed container (0.1 m³) containing 2-chloroethyl ethyl sulfide aerosol (CEES) (initial concentration of 500 mg / m³) and adsorbed at 25 °C for 24 hours.

[0065] 0.1 g of the phytic acid aerogel prepared in Comparative Example 2 was added to 100 mL of a uranyl ion solution with a concentration of 300 mg / L and a pH of 5, and the solution was kept at 25 °C with shaking for 24 hours. The adsorption capacity of the phytic acid aerogel for uranyl ions was calculated, and the results showed that the adsorption capacity was 197 mg / g.

[0066] Figure 9The results show the adsorption performance of the phytic acid aerogel prepared in Comparative Example 2 for uranyl ions and CEES. The initial uranyl concentration was 300 mg / L, the remaining concentration was 103 mg / L, the adsorption capacity was 197 mg / g, and the adsorption removal rate was 65.7%. For CEES adsorption, the concentration of the toxic agent simulant aerosol was 500 mg / m³ (container size 0.1 m³), ​​the remaining CEES concentration was 187 mg / m³, the adsorption capacity was 313 mg / g, and the adsorption removal rate was 62.6%.

[0067] As can be seen from the examples and comparative examples, the MXene / phytic acid composite aerogel prepared by the present invention has significant advantages in adsorbing toxic agent simulant aerosols and uranyl ions.

[0068] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing MXene / phytic acid composite aerogel, characterized in that, Includes the following steps: A crosslinking agent was added to a mixture of MXene dispersion and phytic acid solution, stirred until homogeneous, and then transferred into a mold. After reaction, the mixture was washed and dried to obtain the MXene / phytic acid composite aerogel.

2. The preparation method according to claim 1, characterized in that, The volume ratio of the MXene dispersion to the phytic acid solution is (1-3):

1.

3. The preparation method according to claim 1, characterized in that, The concentration of the MXene dispersion is 2 mg / mL; the concentration of the phytic acid solution is 0.05-0.1 mol / L; and the molar ratio of the crosslinking agent to phytic acid is (0.8-1.7):

1.

4. The preparation method according to claim 1, characterized in that, The crosslinking agent is calcium chloride.

5. The preparation method according to claim 1, characterized in that, The reaction temperature is 30-50℃.

6. An MXene / phytic acid composite aerogel prepared by the preparation method according to any one of claims 1-5.

7. The application of the MXene / phytic acid composite aerogel according to claim 6 in the adsorption of uranyl ions.

8. The application of the MXene / phytic acid composite aerogel according to claim 6 in the adsorption of chemical agent aerosols.

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