Preparation method and application of groundwater uranium and radium removal modified MXene adsorption material

Abstract

This invention discloses a method for preparing and applying a modified MXene adsorbent material for uranium and radium removal from groundwater, belonging to the field of groundwater pollution control technology. This invention addresses the problems of insufficient selectivity for uranium and radium, low adsorption capacity, and difficulties in solid-liquid separation and regeneration of existing adsorbent materials. This invention prepares MX-APTES-PA material through HF etching and a two-step modification reaction, enriching the material surface with numerous phosphate functional groups. This allows uranium and radium to be efficiently and selectively bound to the P-O / P=O groups on the phosphate groups of the introduced phytic acid component via monodentate bonds. Furthermore, after exfoliating MX-APTES-PA into a monolayer and loading it onto the surface of a PES membrane, high water flux is maintained while achieving efficient removal of uranium and radium. The method of this invention is simple to operate, highly adaptable to coexisting ions and common pH environments in natural groundwater, and suitable for the purification of groundwater containing radioactive nuclides uranium and radium, showing promising application prospects.

Description

Technical Field

[0001] This invention belongs to the field of groundwater pollution control technology, specifically, it relates to a method for preparing and applying a groundwater uranium and radium modified MXene adsorbent material. Background Technology

[0002] Uranium and radium are two of the most representative types of radionuclides polluting groundwater. Uranium is both a core raw material for the nuclear industry and a radioactive heavy metal element widely present in the natural environment. Once it enters the aquatic environment, it not only poses radioactive hazards but also exhibits significant chemical toxicity, particularly with the potential to damage the kidneys. While radium, as an alkaline earth metal, is typically found in lower quantities than uranium in the environment, long-term exposure still poses significant radiation health risks. With my country's increasing emphasis on ecological and environmental impact, and considering the health risks posed by uranium and radium entering groundwater and even source water bodies, my country officially implemented the "Standards for Drinking Water Quality (GB5749-2022)" in 2023, which improved the regulatory requirements for uranium and radium in drinking water, specifying the appropriate content of uranium and 226-radium in drinking water.

[0003] In the complex conditions of groundwater environments, the occurrence forms of uranium and radium are influenced by various factors, making it difficult for conventional treatment processes to simultaneously achieve both removal efficiency and selectivity in practical applications. Consequently, conventional water treatment processes often fail to meet the requirements for removing uranium and radium from water bodies. Against this backdrop, there is an urgent need to develop specific high-capacity adsorbent materials to achieve efficient removal of uranium and radium from groundwater. Two-dimensional material MXene, due to its typical layered structure, large specific surface area, and good hydrophilicity, and its surface rich in -O and -OH end groups, provides favorable conditions for ion adsorption. However, it still suffers from insufficient selectivity for uranium and radium and low adsorption capacity. In addition, adsorbent materials also face challenges such as difficulty in solid-liquid separation and inconvenient recycling and regeneration. Summary of the Invention

[0004] This invention provides a method for preparing and applying modified MXene adsorbents for uranium and radium removal from groundwater. This addresses the problems of low uranium and radium removal efficiency, generally low adsorption capacity of adsorbents, and difficulties in solid-liquid separation in existing technologies. This invention improves the surface properties of MXene by introducing a large number of phosphate functional groups through surface modification treatment, which are then bonded to the PO / P=O groups of the introduced phytic acid components via monodentate bonds. Simultaneously, the adsorbent is combined with a membrane. By constructing an adsorption membrane, the interfacial adsorption advantages of powder materials can be combined with the continuous separation, ease of operation, and convenient recovery characteristics of membrane processes. On the one hand, the functional layer loaded on the membrane surface can further enhance the removal capacity of uranium and radium while retaining the membrane separation characteristics; on the other hand, the membrane, as a stable support, can effectively prevent the loss of adsorbent during treatment and simplify subsequent separation and recovery processes.

[0005] To address the aforementioned technical problems, the present invention adopts the following technical solution: The purpose of this invention is to provide a method for preparing a groundwater uranium and radium-modified MXene adsorbent, comprising the following steps: Step 1: Add hydrofluoric acid solution slowly, in small amounts, and multiple times to the MAX phase Ti3AlC2 powder, and perform reaction etching under heating and stirring conditions to remove Al from the raw material; Step 2: Then centrifuge to separate the turbid liquid, take the lower layer, centrifuge and wash it multiple times until the pH is neutral, cool it at -15℃ to -20℃, freeze dry it to obtain MXene powder; Step 3: Take the MXene powder obtained in Step 2, add an appropriate amount of deionized water to prepare a colloidal solution, slowly add an aqueous solution of 3-aminopropyltriethoxysilane (APTES), heat and stir the reaction under inert gas protection, centrifuge after the reaction is completed, take the lower black turbid liquid, centrifuge and wash it several times, and vacuum dry it to obtain MX-APTES powder. Step 4: Take the MX-APTES powder obtained in Step 3, add an appropriate amount of deionized water to prepare a colloidal solution, add phytic acid solution, heat and stir under inert gas protection, centrifuge after the reaction is completed, take the lower black turbid liquid, perform multiple centrifugation and washing, and vacuum dry to obtain the adsorbent material.

[0006] Further specifying, in step 1, the particle size of Ti3AlC2 powder is 300 mesh to 500 mesh.

[0007] Further specifying, in step 1, the mass concentration of the hydrofluoric acid solution is 40%~45%.

[0008] Further specifying, in step 1, the volume ratio of the Ti3AlC2 powder to the hydrofluoric acid solution is 2g:40ml.

[0009] Further specifying, in step 1, the reaction temperature is 40℃~60℃, the stirring speed is 300~500r / min, and the reaction time is 36~48h.

[0010] Further specifying, in step 1, the centrifugation speed is 8000 r / min and the centrifugation time is 15 min.

[0011] To further specify, in step 1, the cooling is carried out inside a refrigerator.

[0012] Further specifying, in step 1, the freeze drying is carried out in a freeze dryer at a temperature of 0℃~4℃.

[0013] Further specifying, in step 2, after each washing and centrifugation with deionized water, a small amount of supernatant should be taken and its pH measured using a pH meter, until the pH of the final supernatant is 6-7.

[0014] Further specifying, in step 3, the mass ratio of MXene powder to APTES is 1:(4~5).

[0015] Further specifying, in step 3, the reaction temperature is 30℃~40℃; the stirring speed is 300~500r / min; and the reaction time is 8~12.

[0016] Furthermore, step 3 requires repeating the washing-centrifugation process at least 8 times.

[0017] Further specifying, in step 3, the centrifugation speed is 4000 r / min and the centrifugation time is 5 min.

[0018] Further specifying, the inert gas is nitrogen.

[0019] Furthermore, in step 4, the mass ratio of MX-APTES powder to PA is 1:(8~10).

[0020] Furthermore, in step 4, the phytic acid solution is prepared by uniformly dispersing phytic acid (PA) in deionized water.

[0021] Further specifying, in step 4, the reaction temperature is 60℃~80℃, the stirring speed is 300~500r / min, and the reaction time is 12~24h.

[0022] Furthermore, step 4 requires repeating the washing-centrifugation process at least 8 times.

[0023] Further specifying, in step 4, the centrifugation speed is 5000 r / min and the centrifugation time is 5 min.

[0024] In addition, the uses of the adsorbent materials prepared by any of the above methods are provided for their application in the preparation of adsorbent membranes for the removal of uranium and / or radium.

[0025] Another object of the present invention is to provide a method for preparing a uranium- and radium-modified MXene adsorption membrane for groundwater removal, comprising the following steps: The adsorbent material prepared by any one of claims 1-7 is dispersed in deionized water to form a colloidal solution. Under ice bath and nitrogen protection conditions, tetramethylammonium hydroxide (TMOAH) solution is added, and the solution is ultrasonically treated. After treatment, the solution is centrifuged, the supernatant is collected, diluted with deionized water, and loaded onto the surface of a polyethersulfone membrane by vacuum filtration and vacuum drying to obtain the adsorbent membrane.

[0026] Further specify that the TMOAH solution accounts for 20% to 30% of the total mass, and the volume ratio of the TMOAH solution to the colloidal solution is 1: (8 to 10).

[0027] Compared with the prior art, the present invention has the following beneficial effects: This invention, while retaining the layered framework structure of MXene, successfully introduces phosphorus- and oxygen-containing active functional groups onto its surface, forming a stable functionalized interface. After modification, the interlayer structure of the material becomes more porous, and the exposure of active sites is significantly improved, which is beneficial for the diffusion and transport of target ions into the interlayer channels.

[0028] This invention significantly enhances the adsorption capacity for uranium and radium (using barium as a simulated pollutant), effectively removing radioactive nuclides such as uranium and radium from groundwater that are difficult to treat using conventional processes. Furthermore, this invention maintains strong removal performance even under conditions of common groundwater pH and the presence of multiple coexisting interfering ions.

[0029] When this invention is used as a membrane functional layer material, it can further construct a composite adsorption membrane system that combines adsorption enrichment and continuous separation capabilities, thereby improving the removal efficiency of radionuclides and its application feasibility. Furthermore, after three regenerations, this invention can still maintain good performance, eliminating the need for frequent material replacement.

[0030] For a deeper understanding of the features and technical content of this invention, please refer to the accompanying detailed description and drawings. It should be noted that the drawings are provided for illustrative purposes only and are not intended to limit the scope of the invention. Attached Figure Description

[0031] Figure 1 Scanning electron microscope images of MXene and MX-APTES-PA; Figure 2 Graphs showing the specific surface area of ​​MXene and MX-APTES-PA; Figure 3X-ray diffraction and Fourier transform infrared spectroscopy analysis of MXene and MX-APTES-PA; Figure 4 Thermogravimetric analysis plots of MXene and MX-APTES-PA; Figure 5 The graph shows the adsorption efficiency of MXene and MX-APTES-PA for uranium and barium removal. Figure 6 The loading capacity is 0.22 mg / cm³. 2 Scanning electron microscope image of the MAP / PES membrane; Figure 7 The graph shows the pure water flux and the removal efficiency of uranium and barium for MAP / PES membranes with different loadings. Figure 8 This is a diagram illustrating the mechanism by which MAP / PES membranes remove uranium, radium, and macromolecular pollutants from water. Detailed Implementation

[0032] The present invention will be described in detail below with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but should not be considered as limiting the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0033] Example 1 The preparation method of the uranium- and radium-modified MXene adsorption membrane material for groundwater removal in this embodiment is carried out according to the following steps: Step 1: Weigh 2g of MAX phase Ti3AlC2 powder with a particle size of 400 mesh into a polytetrafluoroethylene reactor. Slowly add 40ml of hydrofluoric acid solution (HF) with a mass concentration of 40% to the reactor in small amounts. Under the conditions of heating to 50℃, stirring at 500r / min, and reacting for 36h, the reaction is etched to remove Al from the raw material. Step 2: Take the black turbid liquid after Step 1 and centrifuge it using a high-speed centrifuge. Set the centrifuge speed to 8000 r / min and the centrifugation time to 15 min. After each centrifugation, discard the supernatant and keep the lower black turbid liquid. After centrifugation, wash the black turbid liquid with deionized water and centrifuge it again. After each washing and centrifugation with deionized water, take a small amount of supernatant and measure its pH with a pH meter. Continue washing until the pH of the supernatant is 6-7. Place the black turbid liquid obtained from the last washing in a refrigerator and cool it at -20℃ for 12 h. Then transfer it to a freeze dryer and dry it for 48 h to obtain dried MXene powder. Step 3: Take 200 mg of MXene powder obtained in Step 2 and prepare a colloidal solution with 40 ml of deionized water. Slowly add an aqueous solution of 3-aminopropyltriethoxysilane (APTES) to the solution. The mass ratio of MXene powder to APTES is 1:5. React for 10 h under the conditions of heating temperature of 40℃, stirring speed of 500 r / min and nitrogen protection. After the reaction is completed, centrifuge the solution after reaction using a high-speed centrifuge. The centrifuge settings are 4000 r / min and centrifugation time of 5 min. After centrifugation, discard the supernatant and keep the lower turbid black liquid. Wash the black liquid with deionized water and centrifuge again. Repeat the washing-centrifugation process 9 times. Dry the black liquid obtained from the last washing in a vacuum drying oven at 50℃ for 24 h to obtain dried MX-APTES powder. Step 4: Take the MX-APTES powder obtained in Step 3 and prepare a colloidal solution with an appropriate amount of deionized water. Disperse phytic acid (PA) in the deionized water and add it to the solution. The mass ratio of MX-APTES powder to PA is 1:10. React for 24 hours under the conditions of heating temperature of 70℃, stirring speed of 500r / min and nitrogen protection. After the reaction is completed, centrifuge the solution after reaction using a high-speed centrifuge. The centrifuge settings are 5000r / min and centrifugation time of 5min. After centrifugation, discard the supernatant and keep the lower turbid black liquid. Wash the black turbid liquid with deionized water and centrifuge again. Repeat the washing-centrifugation process 10 times. Dry the black turbid liquid obtained from the last washing in a vacuum drying oven at 50℃.

[0034] Comparative Example 1 The original MXene material used in Comparative Example 1 was prepared and dried according to steps 1 and 2 in the specific implementation method, without undergoing the subsequent two steps of reaction modification.

[0035] The scanning electron microscope images of the original MXene material and MX-APTES-PA are shown below. Figure 1 As shown in (a) and (b), the modified MX-APTES-PA sample still maintains a layered structure similar to the original MXene, indicating that the main layered framework of MXene was not destroyed during the introduction of functional groups, and the basic structure of the material remained stable. However, its lamellar stacking state changed to some extent. This change is mainly reflected in the lamellar structure becoming more porous. This is because the grafting or intercalation of the modified groups may have weakened the van der Waals interactions between the lamellars, making the interlayer stacking more porous. This change in morphology is beneficial to increasing the specific surface area and the exposure of surface active sites, and also helps to enhance the diffusion and transport capabilities of ions or molecules in solution to the interlayer channels.

[0036] The pore size and specific surface area analysis diagrams of the original MXene material and MX-APTES-PA are shown below. Figure 2 As shown in (a) and (b), the nitrogen adsorption-desorption isotherms of the original MXene show low adsorption capacity in the low-pressure region and rapidly increase in the high-pressure region (P / P0>0.9), exhibiting a narrow H3-type hysteresis loop. This indicates that it is dominated by a macroporous structure with low micropore and mesopore content, resulting in low specific surface area and adsorption performance, with a maximum adsorption capacity of only about 30 cm³. 3 / gSTP. In comparison, the maximum adsorption capacity of MX-APTES-PA is increased to approximately 70 cm⁻¹. 3 The modified MXene exhibits a more pronounced and wider H3-type hysteresis loop, indicating a richer mesoporous structure and better pore connectivity. These results demonstrate that modification effectively optimizes the pore structure of MXene, thereby significantly improving the material's adsorption performance.

[0037] Comparison of the X-ray diffraction patterns and Fourier transform infrared spectroscopy analysis of the original MXene material and MX-APTES-PA is as follows: Figure 3 As shown in (a) and (b). Analysis Figure 3 (a) As can be seen, compared with the PDF card (pdf#52-0875) of the Ti3AlC2 phase, after etching, the (104) diffraction peak of the MXene sample near 39° was significantly weakened, while the (002) peak in the low-angle region shifted to a lower angle, indicating that the Al layer was effectively removed and the interlayer spacing increased, indicating that MXene was successfully prepared. For the MX-APTES-PA sample, its spectrum retained the typical diffraction characteristics of MXene, while the low-angle characteristic peaks shifted further to a lower angle, indicating that the interlayer spacing was further expanded, which is beneficial to the exposure of active sites and the improvement of adsorption performance. Analysis Figure 3 (b) It can be seen that the modified MX-APTES has a height of 1630.45 cm⁻¹. -1 1341.62cm -1 and 1184.30cm -1 New characteristic absorption peaks appeared, among which 1630.45 cm⁻¹ can be attributed to amino-related vibrations and adsorbed water bending vibrations, and 1341.62 cm⁻¹ and 1184.30 cm⁻¹... -1 This is mainly related to the vibrations of phosphorus-containing groups such as P=O, P–O, and P–O–C introduced by phytic acid, and may overlap with the Si–O vibration to some extent, indicating that APTES and PA have been successfully introduced into the MXene surface.

[0038] Thermogravimetric analysis (TGA) plots of the original MXene material and MX-APTES-PA are shown below. Figure 4As shown, MXene and MX-APTES-PA exhibit significant differences in thermal stability. Compared to MXene, MX-APTES-PA experiences a greater weight loss during heating, which is attributed to the gradual cleavage and dehydration condensation of the introduced APTES and PA-related groups.

[0039] The modified MX-APTES-PA adsorption uranium removal experiment includes the following steps: Step 1: Take 50 ml of the initial uranium concentration C0 (UO4) 2+ A 40 mg / L barium chloride solution was placed in a beaker, and the pH was adjusted to 7.0 using 0.1 mol / L HCl and NaOH. Step 2: Add 10mg MX-APTES-PA powder, place the beaker on a magnetic stirrer and stir at 300r / min, and control the water temperature at 25℃ using a constant temperature water bath. Step 3: Samples are taken at 5, 15, 30, 45, 60, 90, 120, and 180 min of reaction. 0.5 ml of the test solution is transferred using a pipette, a certain amount of buffer solution and azoarsine III solution as a colorimetric reagent are added, and the volume is adjusted to 5 ml with deionized water. After thorough mixing, the solution is added to a quartz colorimetric tube. The purple complex formed by the colorimetric reaction between U(VI) and azoarsine III is measured at a wavelength of 652 nm for quantitative analysis. Finally, the corresponding U(VI) concentration is calculated according to the Lambert-Beer Law using a series of pre-prepared standard solutions and the corresponding absorbance standard curve.

[0040] The modified MX-APTES-PA adsorption radium removal experiment includes the following steps: Because radium is highly radioactive and can easily harm the health of laboratory personnel, many related studies often use non-radioactive barium (Ba), which has similar chemical properties to radium, as a substitute for simulation studies to reduce experimental risks and improve the operability of the research. This is because barium and radium are elements in the same group, have similar ionic radii, behave very similarly in solution, often bind to adsorbent surfaces in similar ways, and exhibit similar properties during ion exchange. Therefore, their adsorption, exchange, and migration patterns on many materials are comparable. Based on the above theory, this study uses barium as a substitute for radium.

[0041] Step 1: Take 50ml of the initial barium concentration C0 (Ba 2+ A 10 mg / L uranyl nitrate solution was placed in a beaker, and the pH was adjusted to 7.0 with 0.1 mol / L HCl and NaOH. Step 2: Add 10mg MX-APTES-PA powder, place the beaker on a magnetic stirrer and stir at 300r / min, and control the water temperature at 25℃ using a constant temperature water bath. Step 3: Samples were taken at 5, 15, 30, 45, 60, 90, 120, and 180 min of reaction. 0.5 mL of the test solution was transferred using a pipette, and an appropriate amount of dilute nitric acid was added to adjust the pH of the system to below 2. The solution was then diluted to 5 mL with deionized water and thoroughly mixed. The concentration of Ba(II) in the pretreated samples was determined using inductively coupled plasma (ICP).

[0042] The experimental procedure for removing uranium and radium by adsorption of MXene was the same as that in Example 1.

[0043] The adsorption efficiency diagrams for uranium and radium removal by comparing the original MXene and the modified MX-APTES-PA are shown below. Figure 5 As shown, the modified MX-APTES-PA in Example 1 has a better removal effect on uranium and radium (using barium as a simulant) than the original MXene. The removal rate of uranium reached 90%, which is 69.58% higher than the original MXene, and the removal rate of radium (using barium as a simulant) reached 22.42%, which is 6.42% higher than the original MXene.

[0044] Example 2 In this embodiment, the application of the modified MXene adsorption membrane for removing uranium and radium from groundwater is carried out according to the following steps: Step 1: Disperse MX-APTES-PA in deionized water to prepare a 90ml colloidal solution. Under ice bath and nitrogen protection, add 10ml of tetramethylammonium hydroxide (TMOAH, mass concentration 30%) as an intercalating agent and sonicate for 2h at a frequency of 40kHz. After treatment, separate the solution by high-speed centrifuge at 10000r / min for 60min. Discard the bottom turbid liquid and keep the supernatant. Step 2: Dilute the supernatant with deionized water. The supernatant containing 2.7744 mg of MX-APTES-PA is then filtered through a vacuum-assisted filter to load the MX-APTES-PA onto the surface of a commercial polyethersulfone (PES) membrane. The PES membrane has a specification of 150 kDa and an area of ​​17.34 cm². 2 The MX-APTES-PA / PES membrane (hereinafter referred to as MAP / PES membrane) was obtained by vacuum drying for 12 hours. Step 3: Place the MAP / PES membrane in the dead-end filtration device and separate 50 ml of solution containing 10 mg / L U(VI) and 2 mg / L Ba(II) through the MAP / PES membrane under a pressure of 0.2 MPa.

[0045] Step 4: Transfer 0.5 ml of the separated solution using a pipette, add a certain amount of buffer solution and azoarsine III solution as a colorimetric reagent, and dilute to 5 ml with deionized water. Mix thoroughly and add to a quartz colorimetric tube. Utilize the purple complex formed by the colorimetric reaction between U(VI) and azoarsine III, and measure its absorbance at a wavelength of 652 nm for quantitative analysis. Finally, calculate the corresponding U(VI) concentration using a series of pre-prepared standard solutions and the corresponding absorbance standard curve according to the Lambert-Beer law. Transfer 0.5 ml of the separated solution using a pipette, add an appropriate amount of dilute nitric acid to adjust the pH of the system to below 2, and then dilute to 5 ml with deionized water and mix thoroughly. The concentration of Ba(II) in the pretreated sample was determined by inductively coupled plasma (ICP). Example 3: The difference between this example and Example 2 is that: In step 2, the content of MX-APTES-PA was 3.1266 mg, and the other steps and parameters were the same as in Example 2.

[0046] Example 4: The difference between this example and Example 2 is that: In step 2, the content of MX-APTES-PA was 3.474 mg, and the other steps and parameters were the same as in Example 2.

[0047] Example 5: The difference between this example and Example 2 is that: In step 2, the content of MX-APTES-PA was 3.8214 mg, and the other steps and parameters were the same as in Example 2.

[0048] Example 6: The difference between this example and Example 2 is that: In step 2, the content of MX-APTES-PA was 4.1688 mg, and the other steps and parameters were the same as in Example 2.

[0049] The loading capacity was 0.22 mg / cm³. 2 Scanning electron microscope image of the MAP / PES membrane as shown below Figure 6 As shown, the membrane surface exhibits a relatively obvious folded, layered morphology. The membrane surface is generally continuous, without obvious large pores or through cracks, indicating that after vacuum-assisted filtration, the MX-APTES-PA sheets can cover the PES substrate membrane surface relatively uniformly, forming a relatively complete surface functional layer. This folded morphology is consistent with the typical two-dimensional layered structure of MXene, indicating that the peeled single / few-layer MX-APTES-PA sheets gradually spread and overlap during the filtration process, depositing on the membrane surface in this layer-by-layer stacking manner.

[0050] The graph shows the pure water flux and removal efficiency of uranium and radium (using barium as a simulant) of MAP / PES membranes with different loadings. Figure 7 As shown, without MX-APTES-PA loading, the PES membrane exhibits a pure water flux of 639.17 LMH and shows no removal effect on uranium and radium (using barium as a simulant). However, after loading different masses of MX-APTES-PA, effective removal of uranium and radium (using barium as a simulant) can be achieved, especially at a loading of 0.22 mg / cm³. 2 Under these conditions, while maintaining a high membrane flux, it is possible to efficiently remove 52% of uranium and 12% of radium from water (using barium as a simulant).

[0051] Working principle: The modified MXene material of this invention is prepared by etching and two-step reaction modification using Ti3AlC2 (400 mesh) as raw material. The surface of this material is rich in a large number of phosphate functional groups, which can efficiently and selectively bind uranium and radium to the PO / P=O of the phosphate group of the introduced phytic acid component through monodentate bonds, thereby effectively removing radioactive nuclides uranium and radium from groundwater.

[0052] The specific embodiments of the present invention have been described in detail above. It should be noted that the present invention is not limited to the specific embodiments described above. Various modifications or alterations can be made by those skilled in the art without departing from the scope of protection defined by the claims, and all such modifications or alterations fall within the scope of the present invention.

Claims

1. A method for preparing a groundwater uranium-radium removal modified MXene adsorption material, characterized in that, Includes the following steps: Step 1: Add hydrofluoric acid solution slowly, in small amounts, and multiple times to the MAX phase Ti3AlC2 powder, and perform reaction etching under heating and stirring conditions to remove Al from the raw material; Step 2: Then centrifuge to separate the turbid liquid, take the lower layer, centrifuge and wash it multiple times until the pH is neutral, cool it at -15℃ to -20℃, freeze dry it to obtain MXene powder; Step 3: Take the MXene powder obtained in Step 2, add an appropriate amount of deionized water to prepare a colloidal solution, slowly add an aqueous solution of 3-aminopropyltriethoxysilane (APTES), heat and stir the reaction under inert gas protection, centrifuge after the reaction is completed, take the lower black turbid liquid, centrifuge and wash it several times, and vacuum dry it to obtain MX-APTES powder. Step 4: Take the MX-APTES powder obtained in Step 3, add an appropriate amount of deionized water to prepare a colloidal solution, add phytic acid (PA) solution, heat and stir under inert gas protection, centrifuge after the reaction is completed, take the lower black turbid liquid, perform multiple centrifugation and washing, and vacuum dry to obtain the adsorbent material.

2. The method of claim 1, wherein, The particle size of Ti3AlC2 powder is 300 mesh to 00 mesh.

3. The method of claim 1, wherein, In step 1, the mass concentration of the hydrofluoric acid solution is 40%~45%; the volume ratio of the Ti3AlC2 powder to the hydrofluoric acid solution is 2g:(30~50)ml.

4. The method of claim 1, wherein, In step 1, the etching reaction temperature is 40℃~60℃.

5. The method of claim 1, wherein, The mass ratio of MXene powder to APTES is 1:(4~5).

6. The method of claim 1, wherein, In step 3, the reaction temperature is 30℃~40℃.

7. The method of claim 1 wherein, In step 4, the reaction temperature is 60℃~80℃, and the mass ratio of MX-APTES powder to PA is 1:(8~10).

8. Use of the adsorbent material produced by the method according to any one of claims 1 to 7, characterized in that, Applications in the preparation of adsorption membranes for the removal of uranium and / or radium.

9. A method for preparing a groundwater uranium-radium removal modified MXene adsorption film, characterized in that, Includes the following steps: The adsorbent material prepared by any one of claims 1-7 is dispersed in deionized water to form a colloidal solution. Under ice bath and nitrogen protection conditions, tetramethylammonium hydroxide (TMOAH) solution is added, and the solution is ultrasonically treated. After treatment, the solution is centrifuged, the supernatant is collected, diluted with deionized water, and loaded onto the surface of a polyethersulfone membrane by vacuum filtration and vacuum drying to obtain the adsorbent membrane.

10. The method of claim 9, wherein, The mass of the TMOAH solution is 20% to 30%, and the volume ratio of the TMOAH solution to the colloidal solution is 1: (8 to 10).

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