P(am@aa)-cu-fe materials, methods of making and uses thereof

Abstract

This invention relates to P(AM@AA)-CuFe materials, their preparation methods, and applications. The P(AM@AA)-CuFe material comprises a hydrophilic polymer with a porous network structure and CuFe nanoparticles uniformly distributed on the surface of the hydrophilic polymer. The CuFe nanoparticles are aggregates with a size range of 100-200 nm, and are grafted onto the hydrophilic polymer via coordination bonds. The preparation method first uses a water-in-water emulsion template technique to prepare a porous hydrophilic polymer, and then uses the active functional groups -OH and -NH2 on the porous hydrophilic polymer as anchor points to grow and fix CuFe nanoparticles in situ. The obtained P(AM@AA)-CuFe material exhibits excellent properties such as high selectivity, high adsorption capacity, and rapid adsorption equilibrium when adsorbing cesium ions.

Description

Technical Field

[0001] This invention relates to the field of nanomaterials technology, specifically to P(AM@AA)-CuFe materials, their preparation methods, and applications. Background Technology

[0002] The spent fuel reprocessing process in the nuclear industry chain generates a large amount of high-level radioactive waste liquid. 137 Cs, as a highly pyrolytic nuclide found in wastewater, is easily absorbed by plants and animals once leaked into the environment, thus damaging the ecological environment and threatening human health. Furthermore, 137 Cs can also be made into heat-releasing elements, radiation sources, catalysts, etc. Therefore, 137 The separation and extraction of cesium ions from high-level radioactive waste or nuclear-contaminated water is of great significance. In existing technologies, metal-organic frameworks (MOFs) possess advantages such as large specific surface area, tunable porosity, and functionalizability, and are often used for the separation of metal ions. CuHCF, as a Prussian blue analog (PBA), is a typical MOF material that can selectively adsorb cesium ions. However, on the one hand, CuHCF nanoparticles are extremely prone to aggregation and stacking, leading to low effective utilization; on the other hand, there are also problems such as high preparation costs and harsh working conditions. Summary of the Invention

[0003] The purpose of this invention is to provide a P(AM@AA)-CuFe material with stable adsorption performance and good adsorption effect, as well as its preparation method and applications.

[0004] This invention provides a P(AM@AA)-CuFe material, comprising a hydrophilic polymer with a porous network structure and CuFe nanoparticles uniformly distributed on the surface of the hydrophilic polymer. The CuFe nanoparticles are aggregated stacks with a size range of 100~200 nm, and the CuFe nanoparticles are grafted onto the hydrophilic polymer through coordination bonds.

[0005] Furthermore, the CuFe nanoparticles in the P(AM@AA)-CuFe material of the present invention utilize the active functional groups -OH and -NH2 on the polymer as anchor grafting points, and the grafting rate of the CuFe nanoparticles in the P(AM@AA)-CuFe material is 57%~61%. Here, the grafting rate refers to the mass ratio of CuFe nanoparticles in the composite material.

[0006] Furthermore, the porosity of the P(AM@AA)-CuFe material described in this invention is ≥70%. Porosity refers to the ratio of the volume of pores inside a material to the total volume of the material, and is usually expressed as a percentage.

[0007] On the other hand, the present invention provides a method for preparing P(AM@AA)-CuFe material based on any of the above-mentioned materials. The preparation method first uses water-in-water emulsion template technology to prepare a porous hydrophilic polymer, and then uses the active functional groups -OH and -NH2 on the porous hydrophilic polymer as anchor points to grow and fix CuFe nanoparticles in situ, thereby obtaining P(AM@AA)-CuFe material.

[0008] The preparation method specifically includes the following steps:

[0009] 1) Dissolve an appropriate amount of dextran and cellulose nanocrystals in water to form solution A, wherein the mass concentration of dextran in solution A is 0.1-0.2 g / mL and the mass concentration of cellulose nanocrystals is 0.02-0.03 g / mL;

[0010] 2) Dissolve appropriate amounts of PEG and MBAM in water to form solution B, wherein the mass concentration of PEG in solution B is 0.2-0.25 g / mL and the mass concentration of MBAM is 0.1-0.15 g / mL.

[0011] 3) Add appropriate amounts of AM and AA to solution B to prepare PEG / AM-AA solution; the volume ratio of AM:AA:solution B is (1~4):(1~4):1;

[0012] 4) Mix the PEG / AM-AA solution with solution A at a volume ratio of (1~2):(4~5), place them in an ice-water bath, and stir until homogeneous to obtain a mixed solution;

[0013] 5) Add an appropriate amount of initiator to the mixed solution to obtain a sol-gel mixture, transfer the sol-gel mixture into a mold, and react in a water bath for 8-12 h to obtain intermediate product P(AM@AA); the initiator includes KPS and TMEDA, and the volume ratio of KPS:TMEDA:mixed solution is (1-2):(1-2):(25-30);

[0014] 6) The intermediate product P(AM@AA) was soaked in 0.1~0.4 M CuCl2 solution for 6~12 h, then soaked in 0.05~0.2 M K4Fe(CN)6 solution for 6~12 h, and the resulting product was placed in ultrapure water and washed for 12~36 h to obtain the P(AM@AA)-CuFe material.

[0015] In this application, AM stands for acrylamide; AA stands for acrylic acid; PEG stands for polyethylene glycol; MBAM stands for methylenebisacrylamide; KPS stands for potassium persulfate; and TMEDA stands for N,N,N',N'-tetramethylethylenediamine. Furthermore, the AA content in the preparation method must be appropriate. If too little AA is added, the adsorption capacity of the resulting P(AM@AA)-CuFe material will be low; conversely, if too much AA is added, the P(AM@AA)-CuFe material will easily absorb water, swell, and crack, resulting in poor mechanical properties.

[0016] Furthermore, in step 5) of the preparation method of the present invention, the temperature of the water bath is 40℃~50℃.

[0017] Furthermore, the cellulose nanocrystals prepared by the method of the present invention are rod-shaped cellulose with a length of 100~200nm and a diameter of 8~10nm.

[0018] Furthermore, in step 4) of the preparation method of the present invention, the temperature of the ice-water bath is -2~5℃, and in step 4) the mixture is mechanically stirred at a stirring rate of 250~350 rpm to achieve uniform mixing.

[0019] Furthermore, in step 5) of the preparation method of the present invention, the mold is a cube-shaped silicone mold with a side length of 10 mm.

[0020] Furthermore, the present invention also provides an application of the P(AM@AA)-CuFe material described above, wherein the P(AM@AA)-CuFe material is used to adsorb cesium ions in water.

[0021] Furthermore, in the application described in this invention, the maximum adsorption capacity of the P(AM@AA)-CuFe material for cesium ions is 175 mg / g, the time to reach adsorption equilibrium is t, and it satisfies 100 min ≤ t ≤ 120 min.

[0022] Furthermore, in the application described in this invention, the P(AM@AA)-CuFe material has an adsorption rate of more than 85% for cesium ions in the solution, wherein the pH of the solution is 2-8, and the solution includes one or more of strontium ions, nickel ions, aluminum ions, sodium ions, potassium ions, calcium ions, magnesium ions, and lanthanide ions.

[0023] Furthermore, in the application described in this invention, the P(AM@AA)-CuFe material has an adsorption rate of more than 90% for cesium ions in the solution, wherein the pH of the solution is 3-8, and the solution includes one or more of strontium ions, nickel ions, aluminum ions, sodium ions, potassium ions, calcium ions, magnesium ions, and lanthanide ions.

[0024] Furthermore, in the application described in this invention, after continuous adsorption-desorption, the adsorption rate of cesium ions in the fourth adsorption of the P(AM@AA)-CuFe material is greater than 80%.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] The P(AM@AA)-CuFe material of this invention has a porosity of ≥70% and comprises a hydrophilic polymer with a porous network structure and CuFe nanoparticles uniformly distributed on the surface of the hydrophilic polymer. The CuFe nanoparticles are aggregated stacks with a size range of 100~200 nm, and are grafted onto the hydrophilic polymer through coordination bonds. The CuFe nanoparticles utilize the active functional groups -OH and -NH2 on the polymer as anchor points for grafting, and the grafting rate of the CuFe nanoparticles in the P(AM@AA)-CuFe material is 57%~61%.

[0027] The preparation method described in this invention uses water-in-water (w / w) emulsion template technology to prepare porous hydrophilic polymers. The production process does not require the use of large amounts of organic solvents, thus overcoming the problem of solvent residue in the final product. It has no significant impact on the environment and is low in cost.

[0028] The P(AM@AA)-CuFe material of this invention can, on the one hand, contain Cs through the crystal cavities inside the material. + It can be contained within the material, while K also exists within the material. + With Cs + The material utilizes ion exchange to adsorb cesium ions from water. It exhibits high selectivity, high adsorption capacity, and rapid adsorption equilibrium when adsorbing cesium ions. At 25°C, the adsorption capacity for cesium ions reaches a maximum of 175 mg / g, and adsorption equilibrium is reached within 100 min. The adsorption rate of the P(AM@AA)-CuFe material for cesium ions in solution is greater than 85%, wherein the pH of the solution is 2-8, and the solution contains one or more of the following ions: strontium, nickel, aluminum, sodium, potassium, calcium, magnesium, and lanthanides. After continuous adsorption-desorption, the adsorption rate of cesium ions in the fourth adsorption by the P(AM@AA)-CuFe material is greater than 80%. Attached Figure Description

[0029] Figure 1 The image shows the microstructure of the P(AM@AA)-CuFe material described in this invention.

[0030] Figure 2 This is a magnified image of the microstructure of the P(AM@AA)-CuFe material described in this invention.

[0031] Figure 3 This is the elemental distribution diagram of the P(AM@AA)-CuFe material described in this invention;

[0032] Figure 4 This is an elemental distribution diagram of the P(AM@AA)-CuFe material after adsorption of cesium ions as described in this invention;

[0033] Figure 5 This invention provides an analysis of the effect of different initial concentrations on the adsorption of Cs ions by P(AM@AA)-CuFe material in Examples 2, 11-13 of the present invention.

[0034] Figure 6 Analysis of the adsorption process of Cs ions by P(AM@AA)-CuFe material over time;

[0035] Figure 7 Analysis of the effects of different metal ions on the adsorption of Cs ions by P(AM@AA)-CuFe material;

[0036] Figure 8 The recyclability of the P(AM@AA)-CuFe material described in this invention;

[0037] Figure 9 The adsorption rate and XRD of the P(AM@AA)-CuFe material described in Examples 2, 5-10, and Comparative Example 3 at different pH values ​​are shown.

[0038] Figure 10 These are diagrams showing the state of the P(AM@AA)-CuFe material after water absorption in Examples 14, 15, Comparative Example 1, and Comparative Example 2 of the present invention.

[0039] Figure 11 Analysis of the adsorption results of cesium ions by the P(AM@AA)-CuFe material described in Examples 14, 15 and Comparative Example 1 of this invention. Detailed Implementation

[0040] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. Where specific conditions are not specified in the detailed embodiments, conventional conditions or conditions recommended by the manufacturer shall apply.

[0041] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims. The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

[0042] The present invention will be further described in detail below with reference to specific embodiments. Specific Implementation Method 1

[0044] A P(AM@AA)-CuFe material includes a hydrophilic polymer with a porous network structure and CuFe nanoparticles uniformly distributed on the surface of the hydrophilic polymer. The CuFe nanoparticles are aggregated stacks with a size range of 100~200 nm and are grafted onto the hydrophilic polymer through coordination bonds.

[0045] In other specific embodiments, the CuFe nanoparticles of the P(AM@AA)-CuFe material are grafted using the active functional groups -OH and -NH2 on the polymer as anchor points, and the grafting rate of the CuFe nanoparticles in the P(AM@AA)-CuFe material is 57%~61%. Here, the grafting rate refers to the mass ratio of CuFe nanoparticles in the composite material.

[0046] In other specific embodiments, the porosity of the P(AM@AA)-CuFe material is ≥70%. Porosity refers to the ratio of the volume of pores inside a material to the total volume of the material, and is usually expressed as a percentage. Specific Implementation Method Two

[0048] A method for preparing P(AM@AA)-CuFe material based on any of the above embodiments, wherein the preparation method first uses water-in-water emulsion template technology to prepare a porous hydrophilic polymer, and then uses the active functional groups -OH and -NH2 on the porous hydrophilic polymer as anchor points to grow and fix CuFe nanoparticles in situ, thereby obtaining P(AM@AA)-CuFe material;

[0049] The preparation method specifically includes the following steps:

[0050] 1) Dissolve an appropriate amount of dextran and cellulose nanocrystals in water to form solution A, wherein the mass concentration of dextran in solution A is 0.1-0.2 g / mL and the mass concentration of cellulose nanocrystals is 0.02-0.03 g / mL;

[0051] 2) Dissolve appropriate amounts of PEG and MBAM in water to form solution B, wherein the mass concentration of PEG in solution B is 0.2-0.25 g / mL and the mass concentration of MBAM is 0.1-0.15 g / mL.

[0052] 3) Add appropriate amounts of AM and AA to solution B to prepare PEG / AM-AA solution; the volume ratio of AM:AA:solution B is (1~4):(1~4):1;

[0053] 4) Mix the PEG / AM-AA solution with solution A at a volume ratio of (1~2):(4~5), place them in an ice-water bath, and stir until homogeneous to obtain a mixed solution;

[0054] 5) Add an appropriate amount of initiator to the mixed solution to obtain a sol-gel mixture, transfer the sol-gel mixture into a mold, and react in a water bath for 8-12 h to obtain intermediate product P(AM@AA); the initiator includes KPS and TMEDA, and the volume ratio of KPS:TMEDA:mixed solution is (1-2):(1-2):(25-30);

[0055] 6) The intermediate product P(AM@AA) was soaked in 0.1~0.4 M CuCl2 solution for 6~12 h, then soaked in 0.05~0.2 M K4Fe(CN)6 solution for 6~12 h, and the resulting product was placed in ultrapure water and washed for 12~36 h to obtain the P(AM@AA)-CuFe material.

[0056] In other specific embodiments, the temperature of the water bath in step 5) of the preparation method is 40℃~50℃.

[0057] In other specific embodiments, the cellulose nanocrystals prepared by the method are rod-shaped cellulose with a length of 100~200 nm and a diameter of 8~10 nm.

[0058] In other specific embodiments, in step 4) of the preparation method, the temperature of the ice-water bath is -2~5℃, and in step 4) the mixture is mechanically stirred at a stirring rate of 250~350 rpm to achieve uniform mixing.

[0059] In other specific embodiments, the mold in step 5) of the preparation method is a cube-shaped silicone mold with a side length of 10 mm. Specific Implementation Method 3

[0061] One use of the P(AM@AA)-CuFe material based on any of the above specific embodiments, wherein the P(AM@AA)-CuFe material is used to adsorb cesium ions in water.

[0062] In other specific embodiments, the maximum adsorption capacity of the P(AM@AA)-CuFe material for cesium ions is 175 mg / g, the time to reach adsorption equilibrium is t, and it satisfies 100 min ≤ t ≤ 120 min.

[0063] In other specific embodiments, the P(AM@AA)-CuFe material has an adsorption rate of more than 85% for cesium ions in the solution, wherein the pH of the solution is 2-8, and the solution includes one or more of strontium ions, nickel ions, aluminum ions, sodium ions, potassium ions, calcium ions, magnesium ions, and lanthanide ions.

[0064] In other specific embodiments, after continuous adsorption-desorption, the adsorption rate of cesium ions in the fourth adsorption of the P(AM@AA)-CuFe material is greater than 80%. Example 1

[0065] 1-4 g of dextran and 0.5-1 g of cellulose nanocrystals were dissolved in 17-20 mL of water to prepare solution A. 0.5-1 g of PEG and 0.5-1 g of MBAM were dissolved in 5-10 mL of water to prepare solution B. AM and AA were then added to solution B to prepare a PEG / AM-AA solution, where the volume ratio of AM:AA:solution B was (1-4):(1-4):1. The PEG / AM-AA solution and solution A were then placed in an ice-water bath and mechanically stirred at 300 rpm until homogeneous. Initiators KPS and TMEDA were then added to the mixed solution. The sol-gelled mixture was immediately transferred to a mold and reacted in a 45°C water bath for 12 h to obtain the intermediate product P(AM@AA). The volume ratio of KPS:TMEDA:mixed solution was (1-2):(1-2):(25-30). The intermediate product P(AM@AA) was immersed in 0.1–0.4 M CuCl2 solution for 6–12 h, followed by immersion in 0.05–0.2 M K4Fe(CN)6 solution for 6–12 h, resulting in the growth of CuFe nanoparticles within the intermediate product P(AM@AA). After the reaction was complete, the product was washed in ultrapure water for 12 h to obtain the composite material P(AM@AA)-CuFe.

[0066] like Figures 1-3As shown, the P(AM@AA)-CuFe material comprises a hydrophilic polymer with a porous network structure and CuFe nanoparticles uniformly distributed on the surface of the hydrophilic polymer. The CuFe nanoparticles are aggregated stacks with a size ranging from 100 to 200 nm, and are grafted onto the hydrophilic polymer via coordination bonds. Furthermore, the grafting rate of the CuFe nanoparticles in the P(AM@AA)-CuFe material was measured to be 57% to 61%. The porosity of the P(AM@AA)-CuFe material is 70.69%. Example 2

[0067] 6-20 mg of the P(AM@AA)-CuFe material obtained in Example 1 was added to 8 mL of a CsNO3 solution with a concentration of 60-600 ppm and a pH of 7. The solution was shaken at 200 rpm on a shaker at 25°C. After continuous shaking, the solution was filtered through a 0.22 μm syringe filter membrane. The concentration of Cs ions in the filtrate was determined using inductively coupled plasma optical emission spectrometry (ICP-OES). The adsorption amount (q) was calculated according to equations (1) and (2), respectively. e The adsorbent's performance was evaluated using adsorption rates (mg / g) and adsorption percentages (RE, %).

[0068] (1)

[0069] (2)

[0070] Where c0 (mgL) −1 ) and c e (mgL −1 The initial and equilibrium concentrations of Cs ions are denoted as V(L) and m(g), respectively.

[0071] Calculations showed that the P(AM@AA)-CuFe material exhibited a maximum adsorption capacity of 175 mg / g for Cs(Ⅰ) at 25℃, and reached adsorption equilibrium within 100 min. Figure 5 and Figure 6 As shown. Figure 5 As shown, the adsorption rate of cesium ions by P(AM@AA)-CuFe material is 46-99%. Analysis of the P(AM@AA)-CuFe material after cesium ion adsorption reveals that the adsorption process utilizes the internal crystal cavities of the material to adsorb Cs ions. + It can be contained within the material, while K also exists within the material. + With Cs + Ion exchange, such as Figure 4 As shown. Example 3

[0072] The difference between Example 3 and Example 2 lies only in that the CsNO3 solution also includes strontium ions, nickel ions, aluminum ions, sodium ions, potassium ions, calcium ions, magnesium ions, as well as La ions, Eu ions, and Lu ions. The analytical results are as follows... Figure 7 As shown, the adsorption rate of P(AM@AA)-CuFe material for cesium ions is also 90-95%. This indicates that P(AM@AA)-CuFe material exhibits extremely strong selectivity for Cs ions, both in systems with multiple metal ions of different valence states and in seawater. Example 4

[0073] The P(AM@AA)-CuFe material after adsorbing cesium ions in Example 3 was eluted in 0.5-1 M KCl solution and shaken in a shaker at 25°C for 2-6 hours to obtain the eluted material. This eluted material was then directly removed and re-added with the original Cs ion solution for a new round of adsorption. After three cycles, the adsorption rate still reached over 80% in the fourth cycle. Figure 8 As shown, the P(AM@AA)-CuFe material exhibits excellent reusability. Example 5

[0074] The only difference between Example 5 and Example 2 is that the pH is 2 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 86%. Example 6

[0075] The only difference between Example 6 and Example 2 is that the pH is 3 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 91%. Example 7

[0076] The only difference between Example 7 and Example 2 is that the pH is 4 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 90.5%. Example 8

[0077] The only difference between Example 8 and Example 2 is that the pH is 5 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 92.5%. Example 9

[0078] The only difference between Example 9 and Example 2 is that the pH is 6 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 93%.

[0079] Example 10:

[0080] The only difference between Example 10 and Example 2 is that the pH is 8 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 91%.

[0081] Example 11:

[0082] The only difference between Example 11 and Example 2 is that the concentration of cesium ions in the CsNO3 solution is 700 ppm, so the adsorption capacity of P(AM@AA)-CuFe material for Cs ions at 25℃ can reach up to 165.3 mg / g, and adsorption equilibrium can be reached in 100 min. The adsorption rate of P(AM@AA)-CuFe material for cesium ions is 34%.

[0083] Example 12:

[0084] The only difference between Example 12 and Example 2 is that the concentration of cesium ions in the CsNO3 solution is 800 ppm, so the adsorption capacity of P(AM@AA)-CuFe material for Cs ions at 25℃ can reach up to 163 mg / g, and adsorption equilibrium can be reached in 100 min. The adsorption rate of P(AM@AA)-CuFe material for cesium ions is 28%.

[0085] Example 13:

[0086] The only difference between Example 13 and Example 2 is that the concentration of cesium ions in the CsNO3 solution is 900 ppm, so the adsorption capacity of P(AM@AA)-CuFe material for Cs ions at 25℃ can reach up to 164 mg / g, and adsorption equilibrium can be reached in 100 min. The adsorption rate of P(AM@AA)-CuFe material for cesium ions is 26%.

[0087] Example 14:

[0088] The only difference between Example 14 and Example 1 is that the volume ratio of added AA to solution B is 3:1, ultimately yielding 3#P(AM@AA)-CuFe material. The 3#P(AM@AA)-CuFe material underwent the adsorption process of Example 2, and the final measured adsorption rate of 3#P(AM@AA)-CuFe material for cesium ions was 52.5%, with an adsorption capacity of 105.9 mg / g. The results are as follows... Figure 11 As shown.

[0089] Example 15:

[0090] The only difference between Example 15 and Example 1 is that the volume ratio of added AA to solution B is 1:1. This yields 2#P(AM@AA)-CuFe material. The 2#P(AM@AA)-CuFe material was subjected to the adsorption process of Example 2, and the final measured adsorption rate of cesium ions for the 2#P(AM@AA)-CuFe material was 47.6%, with an adsorption capacity of 96 mg / g. The results are as follows... Figure 11 As shown.

[0091] Comparative Example 1:

[0092] The only difference between Comparative Example 1 and Example 1 is that the volume ratio of added AA to solution B is 0.5:1. The final product is 1#P(AM@AA)-CuFe material. The 1#P(AM@AA)-CuFe material was subjected to the adsorption process of Example 2. The final measured adsorption rate of 1#P(AM@AA)-CuFe material for cesium ions was 31.6%, and the adsorption capacity was 63.66 mg / g. The results are as follows... Figure 11 As shown.

[0093] Comparative Example 2:

[0094] The only difference between Comparative Example 2 and Example 1 is that the volume ratio of added AA to solution B is 5:1. Finally, 4#P(AM@AA)-CuFe material was obtained. During the adsorption process of Example 2, it was found that the 4#P(AM@AA)-CuFe material swelled and ruptured after absorbing water, as shown in Example 2. Figure 10 As shown.

[0095] Comparative Example 3:

[0096] The only difference between Comparative Example 3 and Example 2 is that the pH is 1 and the adsorption rate of cesium ions by the P(AM@AA)-CuFe material is 60%.

[0097] Comparative Example 4:

[0098] The only difference between Comparative Example 4 and Example 2 is that the pH is 9. At this pH, if the pH is too high, the CuFe nanoparticles will decompose and the adsorption effect will be poor.

[0099] This invention has been described through the specific embodiments described above. Those skilled in the art should understand that various modifications and equivalent substitutions can be made to this invention without departing from its scope. Parts not described in detail in this specification are well-known to those skilled in the art. Furthermore, various modifications can be made to this invention for specific situations or circumstances without departing from its scope. Therefore, this invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims.

Claims

1. A P(AM@AA)-CuFe material, characterized in that, The P(AM@AA)-CuFe material comprises a hydrophilic polymer with a porous network structure and CuFe nanoparticles uniformly distributed on the surface of the hydrophilic polymer. The CuFe nanoparticles are aggregated stacks with a size range of 100~200 nm and are grafted onto the hydrophilic polymer through coordination bonds. The porosity of the P(AM@AA)-CuFe material is ≥70%.

2. The P(AM@AA)-CuFe material according to claim 1, characterized in that, The CuFe nanoparticles utilize the active functional groups -OH and -NH2 on the polymer as anchor points for grafting, and the grafting rate of the CuFe nanoparticles in the P(AM@AA)-CuFe material is 57%~61%.

3. A method for preparing the P(AM@AA)-CuFe material according to claim 1 or 2, characterized in that, The preparation method first uses water-in-water emulsion template technology to prepare a porous hydrophilic polymer, and then uses the active functional groups -OH and -NH2 on the porous hydrophilic polymer as anchor points to grow and fix CuFe nanoparticles in situ on the hydrophilic polymer, thereby obtaining P(AM@AA)-CuFe material. The preparation method specifically includes the following steps: 1) Dissolve an appropriate amount of dextran and cellulose nanocrystals in water to form solution A, wherein the mass concentration of dextran in solution A is 0.1-0.2 g / mL and the mass concentration of cellulose nanocrystals is 0.02-0.03 g / mL; 2) Dissolve appropriate amounts of PEG and MBAM in water to form solution B, wherein the mass concentration of PEG in solution B is 0.2-0.25 g / mL and the mass concentration of MBAM is 0.1-0.15 g / mL. 3) Add appropriate amounts of AM and AA to solution B to prepare PEG / AM-AA solution; the volume ratio of AM:AA:solution B is (1~4):(1~4):1; 4) Mix the PEG / AM-AA solution with solution A at a volume ratio of (1~2):(4~5), place them in an ice-water bath, and stir until homogeneous to obtain a mixed solution; 5) Add an appropriate amount of initiator to the mixed solution to obtain a sol-gel mixture, transfer the sol-gel mixture into a mold, and react it in a water bath for 8-12 hours to obtain the intermediate product P(AM@AA); the initiator includes KPS and TMEDA, and the volume ratio of KPS:TMEDA:mixed solution is (1-2):(1-2):(25-30). 6) The intermediate product P(AM@AA) was soaked in 0.1~0.4 M CuCl2 solution for 6~12 h, then soaked in 0.05~0.2 M K4Fe(CN)6 solution for 6~12 h, and the resulting product was placed in ultrapure water for standing and washing for 12~36 h to obtain the P(AM@AA)-CuFe material.

4. The preparation method according to claim 3, characterized in that, The temperature of the water bath in step 5) is 40℃~50℃.

5. The preparation method according to claim 4, characterized in that, Cellulose nanocrystals are rod-shaped cellulose molecules with a length of 100-200 nm and a diameter of 8-10 nm.

6. An application of a P(AM@AA)-CuFe material, characterized in that, The P(AM@AA)-CuFe material is the P(AM@AA)-CuFe material according to claim 1 or 2, or the P(AM@AA)-CuFe material prepared by the preparation method of the P(AM@AA)-CuFe material according to any one of claims 3 to 5. The P(AM@AA)-CuFe material is used to adsorb cesium ions in water.

7. The use according to claim 6, characterized in that, The maximum adsorption capacity of the P(AM@AA)-CuFe material for cesium ions is 175 mg / g, and the time to reach adsorption equilibrium is t, which satisfies 100 min ≤ t ≤ 120 min.

8. The use according to claim 7, characterized in that, The P(AM@AA)-CuFe material has an adsorption rate of more than 85% for cesium ions in the solution, the pH of the solution is 2-8, and the solution includes one or more of strontium ions, nickel ions, aluminum ions, sodium ions, potassium ions, calcium ions, magnesium ions, and lanthanide ions.

9. The use according to claim 8, characterized in that, After three consecutive adsorption-desorption cycles, the adsorption rate of cesium ions in the fourth adsorption of the P(AM@AA)-CuFe material is greater than 80%.

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