Preparation Method and Application of Reboundable and Selective PAM / xNBR-AO Uranium Adsorption Material

Abstract

Preparation method and application of PAM / xNBR-AO uranium adsorption material with resilience and selectivity. The present invention relates to the technical field of uranium adsorbent preparation. The present invention is to solve the technical problems of existing uranium adsorption materials, such as complete swelling, compression and fragmentation under force, poor adsorption selectivity, and low adsorption efficiency. The present invention uses acrylamide and nano carboxylated nitrile rubber as raw materials, and prepares a PAM / xNBR-AO uranium adsorption material with resilience and selectivity through the methods of radiation-induced graft polymerization and amidoximation. The present invention obtains a PAM / xNBR-AO three-dimensional gel material with excellent resilience performance, high adsorption selectivity, high-efficiency uranium adsorption performance, easy recovery and recyclability, and good adsorption stability. The present invention prepares the PAM / xNBR-AO uranium adsorption material for treating uranium-containing wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of uranium adsorbent preparation. Background Art

[0002] The removal of uranium in radioactive waste liquid generated by the nuclear industry cycle mainly adopts methods such as adsorption method, chemical deposition method, ion exchange method, solvent extraction method, membrane separation method and biological method, etc. Among them, the adsorption method utilizes the interaction between the adsorbent and the adsorbate to adsorb uranyl ions on the surface of the adsorbent, and then achieves the purpose of adsorption and separation. And the adsorption method has the advantages of simple operation, strong pertinence, wide material sources, etc. Among different physical and chemical interactions, the chelation in adsorption is an important mechanism for the directional adsorption of target pollutants. At the same time, constructing a nucleophilic ligand chelation is an effective method for selective adsorption, and the amidoxime group is a good nucleophilic ligand for adsorbing uranium. Therefore, the amidoxime-based adsorbent has high efficiency and selectivity for adsorbing uranium. At present, the substrate materials for preparing amidoxime-based adsorption materials include powder materials such as carbon-based and biomass; fiber materials such as nylon and non-woven fabrics; magnetic materials such as iron oxide-loaded and ferrocenyl cyanide-loaded; membrane materials such as polyacrylonitrile and poly(imidoxime); gel materials such as polyacrylamide and polyacrylic acid, etc. The above materials often have problems such as cumbersome preparation, poor stability, the need to introduce a cyano group donor, poor selectivity and mechanical properties during the preparation and application processes, which limit their application in the field of purifying radioactive uranium-containing wastewater.

[0003] Polyacrylamide (PAM) has good hydrophilicity, contains active groups such as carbon-carbon double bonds and amide groups on the molecule, and is easy to be functionalized and modified. It has a three-dimensional network structure, a large specific surface area and good recyclability in the water environment, and has broad application prospects in the field of uranium adsorption. However, after PAM absorbs water and swells to saturation, it is fragile under compression and has poor resilience, and has poor stability, selectivity and mechanical properties in the actual uranium solution. In addition, after polyacrylamide swells sufficiently, the pores of the formed three-dimensional gel network become larger, and the uranium solution can fully contact with the functional groups on PAM, but there are no functional groups on the PAM molecule that can coordinate well with uranium, thus limiting the uranium adsorption performance of PAM.

[0004] Carboxylated nitrile rubber (xNBR) is a nano-rubber emulsion that has a mechanical toughening effect on the matrix material. The xNBR molecular chain contains functional groups such as carbon-carbon double bonds, terminal carboxyl groups, and cyano groups. In the PAM matrix, xNBR is introduced by the method of radiation-induced graft polymerization. On the one hand, it prevents PAM from completely swelling, being compressed and fragmented under force, and increases the resilience performance. On the other hand, the cyano groups on the xNBR molecules are modified to form amidoxime groups (-AO) through amidoximation reaction, which simplifies the experimental process without introducing a cyano donor. After the PAM / xNBR-AO composite material is completely swollen, uranyl ions can enter its interior and bind to the adsorption site -AO, improving the adsorption selectivity of the PAM / xNBR-AO composite material; at the same time, it has a specific pore structure and a certain resilience performance, is easy to recycle, and is a material close to industrialization.

[0005] In view of the problems of poor resilience, adsorption stability, adsorption selectivity, and low adsorption efficiency of the current uranium adsorbents for radioactive waste liquid, it is urgent to develop a uranium adsorption composite material with good mechanical resilience performance, high adsorption selectivity, easy recycling and reusability, and simple preparation. Summary of the Invention

[0006] The present invention is to solve the technical problems of complete swelling, compression and fragmentation under force, poor adsorption selectivity, and low adsorption efficiency of existing uranium adsorption materials, and provides a preparation method and application of a PAM / xNBR-AO uranium adsorption material with resilience and selectivity.

[0007] The PAM / xNBR-AO uranium adsorption material with resilience and selectivity is prepared by the method of radiation-induced graft polymerization, using acrylamide (AM) as the matrix, xNBR as the toughness enhancer and cyano group provider, and is made through free radical polymerization and amidoximation reaction.

[0008] The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity is specifically carried out according to the following steps:

[0009] I. Put the xNBR nano-rubber emulsion into a PET bottle, irradiate it according to the preset γ-ray irradiation dose to obtain a pre-irradiated xNBR nano-rubber emulsion, and add an acrylamide solution to the pre-irradiated xNBR nano-rubber emulsion, stir evenly to obtain a PAM / xNBR mixed solution;

[0010] II. Irradiate the PAM / xNBR mixed solution obtained in step I according to the preset γ-ray irradiation dose to obtain PAM / xNBR, and then perform sufficient swelling;

[0011] III. Prepare a mixed solvent, then add hydroxylamine hydrochloride, add an alkaline solution to adjust the pH value to 6 - 9, and then add the swollen PAM / xNBR from Step II to carry out the amidoximation reaction. Control the temperature at 60 - 80 °C and react for 4 - 24 h, then wash to obtain the PAM / xNBR-AO uranium adsorption material with resilience and selectivity.

[0012] Application of the described PAM / xNBR-AO uranium adsorption material with resilience and selectivity. This PAM / xNBR-AO uranium adsorption material is used as an adsorption material in the treatment of uranium-containing wastewater.

[0013] Application of the described PAM / xNBR-AO uranium adsorption material with resilience and selectivity. The method for the PAM / xNBR-AO uranium adsorption material to treat uranium-containing wastewater is as follows: Add the PAM / xNBR-AO uranium adsorption material to the uranium-containing wastewater. The mass ratio of the PAM / xNBR-AO uranium adsorption material to the volume of the uranium-containing wastewater is 0.6 g / L. Use 0.5 mol / L HNO3 solution and 0.5 mol / L NaOH solution to adjust the pH of the uranium-containing wastewater to 2.0 - 7.0. The adsorption time is 30 - 1080 min, where the uranium concentration is 50 - 500 mg / L, the adsorption temperature is 25 °C, and the oscillation speed is 150 r / min.

[0014] The present invention solves the technical problems that after polyacrylamide absorbs water and swells to saturation, it is fragile when compressed under force, has poor resilience, the preparation of uranium adsorbents is cumbersome, has poor stability, requires the introduction of a cyano group donor, and has poor adsorption stability, selectivity, and mechanical properties in actual uranium solutions.

[0015] Advantages of the present invention:

[0016] Compared with the prior art, the present invention has the following characteristics:

[0017] (1) The method for preparing the PAM / xNBR-AO uranium adsorption material in the present invention is simple, environmentally friendly by using the radiation method, and the material structure is stable and has resilience, improving the preparation efficiency of the material and being conducive to large-scale application.

[0018] (2) The PAM / xNBR-AO uranium adsorption material prepared in the present invention contains a large number of amidoxime groups on its surface, which can have a coordination effect with uranyl ions. At the same time, it has a three-dimensional network structure, which is conducive to the full contact of uranyl ions with active groups, thus improving the adsorption performance of uranyl ions.

[0019] (3) The PAM / xNBR-AO uranium adsorption material prepared in the present invention has excellent selectivity for uranyl ions.

[0020] (4) The PAM / xNBR-AO uranium adsorption material prepared by the present invention realizes rapid and high-capacity adsorption of uranyl ions in solution, providing a new scheme for the preparation of functional adsorbents.

[0021] The PAM / xNBR-AO uranium adsorption material prepared by the present invention is used to treat uranium-containing wastewater. Description of the Drawings

[0022] Figure 1 It is the preparation process of Example 1 and the adsorption mechanism diagram of the obtained PAM / xNBR-AO uranium adsorption material;

[0023] Figure 2 It is the infrared spectrogram of PAM / xNBR and PAM / xNBR-AO before and after the amidoxime reaction in Example 1;

[0024] Figure 3 It is the scanning electron micrograph of the surface of the PAM / xNBR-AO uranium adsorption material prepared in Example 1;

[0025] Figure 4 It is the stress-strain curve diagram (ε = 90%) during 20 cycles of compression of the PAM / xNBR-AO uranium adsorption material prepared in Example 1;

[0026] Figure 5 It is the diagram of the influence of pH on the adsorption capacity of the PAM / xNBR-AO uranium adsorption material prepared in Example 1;

[0027] Figure 6 It is the diagram of the influence of adsorption time on the adsorption capacity of the PAM / xNBR-AO uranium adsorption material prepared in Example 1;

[0028] Figure 7 It is the adsorption isotherm diagram of the PAM / xNBR-AO uranium adsorption material prepared in Example 1;

[0029] Figure 8 It is the diagram of the influence of competitive ions on the adsorption capacity of the PAM / xNBR-AO uranium adsorption material prepared in Example 1;

[0030] Figure 9 It is the diagram of the comparison of the adsorption performance of the uranium adsorbents prepared in Example 1, Example 3, Example 4, and Example 5. Detailed Embodiments

[0031] Detailed Embodiment 1: The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity is carried out according to the following steps:

[0032] 1. Put the xNBR nano rubber latex into a PET bottle, irradiate it according to a preset γ-ray irradiation dose to obtain a pre-irradiated xNBR nano rubber latex, add the acrylamide solution to the pre-irradiated xNBR nano rubber latex, stir evenly, and obtain a PAM / xNBR mixed solution;

[0033] 2. irradiating the PAM / xNBR mixed solution obtained in step 1 according to a preset γ-ray irradiation dose to obtain PAM / xNBR, and then fully swelling it;

[0034] 3. Prepare a mixed solvent, then add hydroxylamine hydrochloride, add an alkaline solution to adjust the pH value to 6-9, then add the PAM / xNBR swollen in step 2, carry out amidoximation reaction, control the temperature to 60-80°C for 4-24h, and then wash to obtain a PAM / xNBR-AO uranium adsorption material with resilience and selectivity.

[0035] Specific embodiment 2: This embodiment is different from the specific embodiment 1 in that the irradiation dose of the xNBR nano rubber latex in step 1 is 50 to 250 kGy. The rest is the same as the specific embodiment 1.

[0036] Specific embodiment 3: This embodiment is different from specific embodiment 1 or 2 in that: the mass percentage of the xNBR nano rubber latex in step 1 is 42%, the mass percentage of the acrylamide solution is 30%, and the mass ratio of the pre-irradiated xNBR nano rubber latex to the acrylamide solution is (4-144):36. Others are the same as specific embodiment 1 or 2.

[0037] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that the irradiation dose of the PAM / xNBR mixed solution in step 2 is 1-100 kGy and the irradiation time is 6 to 20 hours. It is the same as specific embodiments 1 to 3.

[0038] Specific implementation method 5: This implementation method is different from specific implementation methods 1 to 4 in that: step 3 uses deionized water to wash three times, and then soaks in a large amount of deionized water for 12 hours. It is the same as specific implementation methods 1 to 4.

[0039] Specific embodiment 6: This embodiment is different from specific embodiments 1 to 5 in that: the mixed solvent in step 3 is a mixture of one or more of DMSO, DMF, H2O, CH3OH and CH3CH2OH and H2O in a volume ratio of 1:1. It is the same as specific embodiments 1 to 5.

[0040] Specific Embodiment Seven: The difference between this embodiment and any one of Specific Embodiments One to Six is that after adding hydroxylamine hydrochloride in Step Three, the mass concentration of hydroxylamine hydrochloride in the solution is 5-10%. It is the same as any one of Specific Embodiments One to Six.

[0041] Specific Embodiment Eight: The difference between this embodiment and any one of Specific Embodiments One to Seven is that the alkaline solution in Step Three is one or a mixture of several of Na2CO3, NaHCO3, NaOH, and triethylamine. It is the same as any one of Specific Embodiments One to Seven.

[0042] Specific Embodiment Nine: This embodiment has the application of a resilient and selective PAM / xNBR-AO uranium adsorption material, and this PAM / xNBR-AO uranium adsorption material is used as an adsorption material in treating uranium-containing wastewater.

[0043] Specific Embodiment Ten: The difference between this embodiment and Specific Embodiment Nine is that the method for treating uranium-containing wastewater with the PAM / xNBR-AO uranium adsorption material is as follows: The PAM / xNBR-AO uranium adsorption material is added to the uranium-containing wastewater, and the mass ratio of the PAM / xNBR-AO uranium adsorption material to the volume of the uranium-containing wastewater is 0.6 g / L. The pH of the uranium-containing wastewater is adjusted to 2.0-7.0 with 0.5 mol / L HNO3 solution and 0.5 mol / L NaOH solution. The adsorption time is 30-1080 min, where the uranium concentration is 50-500 mg / L, the adsorption temperature is 25 °C, and the oscillation speed is 150 r / min. It is the same as Specific Embodiment Nine.

[0044] The content of the present invention is not limited to the content of the above embodiments, and the combination of one or several specific embodiments can also achieve the purpose of the invention.

[0045] Example 1: This example has a preparation method of a resilient and selective PAM / xNBR-AO uranium adsorption material, which is specifically carried out according to the following steps:

[0046] 1. Put the xNBR nano-rubber emulsion into a PET bottle and irradiate it according to a γ-ray irradiation dose of 100 kGy (the irradiation dose rate is 10 kGy / h and the irradiation time is 10 h) to obtain a pre-irradiated xNBR nano-rubber emulsion. Add an acrylamide solution with a mass concentration of 30% to the pre-irradiated xNBR nano-rubber emulsion. The mass ratio of xNBR nano-rubber to the acrylamide solution is 54:36, and stir evenly at room temperature for 0.5 h to obtain a PAM / xNBR mixed solution;

[0047] II. Irradiate the PAM / xNBR mixed solution obtained in Step I at a γ-ray irradiation dose of 5 kGy (irradiation dose rate: 0.5 kGy / h, irradiation time: 10 h) to obtain PAM / xNBR, and then perform sufficient swelling;

[0048] III. Prepare 80 mL of a mixed solvent with Vmethanol:Vdeionized water = 1:1, then add hydroxylamine hydrochloride with a mass concentration of 10%, add triethylamine to adjust the pH value to 7, and then add the PAM / xNBR after swelling in Step II to carry out the amidoximation reaction. Control the temperature at 70 °C and react for 6 h, then wash 3 times with deionized water and soak in a large amount of deionized water for 12 h to obtain the PAM / xNBR-AO uranium adsorption material with resilience and selectivity.

[0049] Example 2:

[0050] The difference between this example and Example 1 is that in Step I, the irradiation is carried out at a γ-ray irradiation dose of 200 kGy. Others are the same as in Example 1.

[0051] Example 3:

[0052] The difference between this example and Example 1 is that in Step I, the mass ratio of xNBR nano-rubber to acrylamide solution is 9:36. Others are the same as in Example 1.

[0053] Example 4:

[0054] The difference between this example and Example 1 is that in Step I, the mass ratio of xNBR nano-rubber to acrylamide solution is 24:36. Others are the same as in Example 1.

[0055] Example 5:

[0056] The difference between this example and Example 1 is that in Step I, the mass ratio of xNBR nano-rubber to acrylamide solution is 144:36. Others are the same as in Example 1.

[0057] Example 6:

[0058] The difference between this example and Example 1 is that in Step II, the irradiation is carried out at a γ-ray irradiation dose of 10 kGy. Others are the same as in Example 1.

[0059] Example 7:

[0060] The difference between this example and Example 1 is that in Step II, the irradiation is carried out at a γ-ray irradiation dose of 15 kGy. Others are the same as in Example 1.

[0061] Example 8:

[0062] The difference between this example and Example 1 is that in Step 3, the mixed solvent is a 1:1 volume ratio mixture of DMSO and deionized water. Others are the same as in Example 1.

[0063] Example 9:

[0064] The difference between this example and Example 1 is that in Step 3, Na2CO3 is used to adjust the pH value. Others are the same as in Example 1.

[0065] Example 10:

[0066] The difference between this example and Example 1 is that in Step 3, the pH value is adjusted to 6.5. Others are the same as in Example 1.

[0067] Example 11:

[0068] The difference between this example and Example 1 is that in Step 3, the reaction is carried out at 80 °C for 8 h. Others are the same as in Example 1.

[0069] Figure 1 It is the preparation process of Example 1 and the adsorption mechanism diagram of the obtained PAM / xNBR-AO uranium adsorption material.

[0070] Figure 2 It is the infrared spectrum diagram of PAM / xNBR and PAM / xNBR-AO before and after the amidoxime reaction in Example 1;

[0071] In PAM / xNBR and PAM / xNBR-AO, the peak at 2237 cm -1 is the -CN characteristic peak, and this peak weakens significantly after amidoximation. In

[0072] the infrared spectrum of PAM / xNBR-AO, new characteristic peaks appear at 1173 cm -1 and 932 cm -1 , which are attributed to

[0073] the stretching vibrations of C-N and N-O respectively, indicating that the amidoximation reaction is successful and there are amidoxime groups on the surface of the adsorption material.

[0074] Figure 3 It is the scanning electron microscope image of the surface of the PAM / xNBR-AO uranium adsorption material prepared in Example 1. PAM / xNBR-AO has a three-dimensional porous structure, which helps the uranyl ions in the solution to fully contact with the surface active groups, thus improving the adsorption performance.

[0075] Figure 4 It is the stress-strain curve diagram (ε = 90%) during the 20th cycle compression of the PAM / xNBR-AO uranium adsorption material prepared in Example 1. From Figure 4It can be seen that the PAM / xNBR-AO uranium adsorption material can still be greater than 60% of the maximum compressive strength after 20 cycles of compression and rebound.

[0076] The PAM / xNBR-AO uranium adsorption material with resilience and selectivity prepared in Example 1 was added to the uranium-containing wastewater. The mass ratio of the PAM / xNBR-AO uranium adsorption material to the volume of the uranium-containing wastewater was 0.6 g / L. The pH of the uranium-containing wastewater was adjusted to 2.0 - 7.0 with 0.5 mol / L HNO3 solution and 0.5 mol / L NaOH solution. The adsorption time was 30 - 1080 min, the uranium concentration was 100 mg / L, the adsorption temperature was 25 °C, and the oscillation speed was 150 r / min.

[0077] An ultraviolet spectrophotometer was used to measure and calculate the adsorption amount of PAM / xNBR-AO for uranyl ions.

[0078] Figure 5 It is a graph showing the effect of pH on the adsorption amount of the PAM / xNBR-AO uranium adsorption material prepared in Example 1 (adsorption time is 1080 min); when the pH increases from 2.0 to 5.5, the adsorption amount of PAM / xNBR-AO for uranyl ions gradually increases. When the pH continues to increase, the adsorption capacity gradually decreases, and the adsorption capacity is the largest at a pH of 5.5 for the uranium adsorption test.

[0079] Under the conditions of a uranium solution concentration of 100 mg / L, a solid-liquid ratio of 0.6 g / L, a pH of 5.5, and a temperature of 25 °C, the adsorption time was controlled at 30 min, 60 min, 90 min, 120 min, 180 min, 360 min, 480 min, 720 min, 840 min, 960 min, and 1080 min to test the effect of adsorption time on the adsorption amount of PAM / xNBR-AO.

[0080] Figure 6 It is a graph showing the effect of adsorption time on the adsorption amount of the PAM / xNBR-AO uranium adsorption material prepared in Example 1. The results show that the adsorbent in Example 1 has a high adsorption efficiency for uranium, and the adsorption efficiency reaches 90% within 480 min and reaches adsorption equilibrium at 720 min.

[0081] Under the conditions of a solid-liquid ratio of 0.6 g / L, a pH of 5.5, an adsorption time of 720 min, and a temperature of 25 °C, the uranium solution concentration was adjusted to 50 mg·L -1 、100 mg·L -1 、125 mg·L -1 、143 mg·L -1 、167 mg·L -1 、200 mg·L -1 、250 mg·L-1 、333 mg·L -1 、400 mg·L -1 、500 mg·L -1 , calculate the adsorption capacity of the adsorbent at different uranium solution concentrations.

[0082] Figure 7 Figure 2 shows the adsorption isotherm of the PAM / xNBR-AO uranium adsorbent prepared in Example 1. The isotherm was fitted and analyzed, and it conforms to the Langumir model. The maximum adsorption capacity obtained by fitting calculation is 386.10 mg / g, indicating that the adsorption of uranyl ions by this adsorbent is mainly monolayer chemisorption and has a high adsorption capacity.

[0083] Prepare a mixed solution of CaCl2, MgCl2, K2(SO4)2, Ni(NO3)2, Cu(NO3)2, NaNO3, and UO2(NO3)2·6H2O with a concentration of 100 mg / L, and adjust the pH of the solution to 5.5. Pipette 20 mL of the above solution into a 50 mL centrifuge tube, add 12 mg of the adsorbent, and shake at 298 K for 12 h. After adsorption, take the supernatant and measure the concentrations of uranyl ions and other metal cations in the supernatant by ICP-MS, and calculate the adsorption capacity and adsorption efficiency of the adsorbent for the above ions.

[0084] Figure 8 Figure 3 shows the effect of competitive ions on the adsorption capacity of the PAM / xNBR-AO uranium adsorbent prepared in Example 1. As can be seen from the figure, among many ions, the adsorption amount of uranium by this adsorbent is much larger than that of other metal ions, indicating that the PAM / xNBR-AO uranium adsorbent prepared in Example 1 has excellent adsorption selectivity.

[0085] Under the conditions of uranium solution concentration of 100 mg / L, solid-liquid ratio of 0.6 g / L, pH of 5.5, adsorption time of 720 min, and temperature of 25 °C, measure the adsorption amount of the adsorption material.

[0086] Figure 9 Figure 4 shows the comparison of the adsorption performance of the uranium adsorbents prepared in Example 1, Example 3, Example 4, and Example 5; the results show that the saturated adsorption capacities of the adsorbents prepared in Example 3, Example 4, and Example 5 are lower than that of the adsorbent obtained in Example 1.

Claims

1. Preparation method of a PAM / xNBR-AO uranium adsorption material with resilience and selectivity, characterized in that The method is specifically carried out in the following steps:

1. Put the xNBR nano rubber latex into a PET bottle, irradiate it according to a preset γ-ray irradiation dose to obtain a pre-irradiated xNBR nano rubber latex, add the acrylamide solution to the pre-irradiated xNBR nano rubber latex, stir evenly, and obtain a PAM / xNBR mixed solution; 2. irradiating the PAM / xNBR mixed solution obtained in step 1 according to a preset γ-ray irradiation dose to obtain PAM / xNBR, and then fully swelling it; 3. Prepare a mixed solvent, then add hydroxylamine hydrochloride, add an alkaline solution to adjust the pH value to 6-9, then add the PAM / xNBR swollen in step 2, carry out amidoximation reaction, control the temperature to 60-80°C for 4-24h, and then wash to obtain a PAM / xNBR-AO uranium adsorption material with resilience and selectivity.

2. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, characterized in that The irradiation dose of the xNBR nano rubber latex in step 1 is 50 to 250 kGy.

3. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, characterized in that In step 1, the mass percentage of the xNBR nano rubber latex is 42%, the mass percentage of the acrylamide solution is 30%, and the mass ratio of the pre-irradiated xNBR nano rubber latex to the acrylamide solution is (4-144):

36.

4. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, wherein In step 2, the irradiation dose of the PAM / xNBR mixed solution is 1-100 kGy, and the irradiation time is 6-20 h.

5. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, characterized in that Step three: rinse with deionized water three times, and then soak in a large amount of deionized water for 12 hours.

6. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, characterized in that The mixed solvent in step 3 is a mixture of one or more of DMSO, DMF, H2O, CH3OH and CH3CH2OH and H2O in a volume ratio of 1:

1.

7. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, characterized in that Step 3: After adding hydroxylamine hydrochloride, the mass concentration of hydroxylamine hydrochloride in the solution is 5-10%.

8. The preparation method of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 1, characterized in that In step 3, the alkaline solution is a mixture of one or more of Na2CO3, NaHCO3, NaOH and triethylamine.

9. Use of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity prepared as claimed in claim 1, characterized in that The PAM / xNBR-AO uranium adsorption material is used as an adsorption material in treating uranium-containing wastewater.

10. Use of the PAM / xNBR-AO uranium adsorption material with resilience and selectivity according to claim 9, characterized in that The method for treating uranium-containing wastewater with the PAM / xNBR-AO uranium adsorption material is as follows: adding the PAM / xNBR-AO uranium adsorption material to the uranium-containing wastewater, wherein the mass ratio of the PAM / xNBR-AO uranium adsorption material to the volume of the uranium-containing wastewater is 0.6 g / L, adjusting the pH of the uranium-containing wastewater to 2.0-7.0 using 0.5 mol / L HNO3 solution and 0.5 mol / L NaOH solution, and the adsorption time is 30-1080 min, wherein the uranium concentration is 50-500 mg / L, the adsorption temperature is 25°C, and the oscillation speed is 150 r / min.

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