Cationic polymer material, preparation method thereof and application of cationic polymer material in rhenium adsorption separation

Abstract

The application discloses a cationic polymer material and a preparation method and application thereof in rhenium adsorption separation, and the preparation method comprises the following steps: 2,4,6-tri(4-pyridyl)pyridine is prepared from 2,4,6-tri-bromopyridine, pyridine-4-boronic acid, potassium carbonate and a palladium catalyst; 2,4,6-tri(4-pyridyl)pyridine is subjected to a heating reaction with 5,5'-bis(bromomethyl)-2,2'-bipyridine, so that the reactants are subjected to a quaternary ammonium polymerization reaction, and a cationic polymer precursor is generated; the cationic polymer precursor is purified to obtain an unmethylated cationic polymer; a methylating agent is added to the unmethylated cationic polymer, so that the pyridine groups in the polymer skeleton are subjected to a methylation reaction; solid products are obtained through filtration separation, and the solid products are added into a sodium chloride aqueous solution to be subjected to an anion exchange treatment, so that a methylated cationic polymer material is obtained. The cationic polymer material prepared by the application has more effective active sites capable of participating in rhenium adsorption, so that the cationic polymer material has a higher adsorption capacity for perrhenate ions.

Description

Technical Field

[0001] This invention belongs to the field of adsorbent technology, specifically relating to a cationic polymer material, its preparation method, and its application in rhenium adsorption and separation. Background Technology

[0002] Rhenium is an important rare and dispersed precious metal with significant applications in aerospace high-temperature structural materials, catalysts, and electronic materials. However, its abundance in nature is extremely low, and it mostly exists in low concentrations in ore leachates or industrial wastewater, making recovery and enrichment difficult. Adsorption separation is widely used for rhenium separation and recovery due to its simplicity and adaptability. However, existing adsorption materials generally suffer from limited adsorption capacity per unit mass, making it difficult to achieve efficient enrichment in low-concentration or large-volume systems, thus restricting the efficient utilization of rhenium resources.

[0003] In recent years, cationic polymer materials have attracted attention due to their excellent binding ability to anionic species. For example, CN115403767A discloses a method for preparing a cationic organic polymer and its application in the adsorption of perrhenate. This method uses 1,3,5-tris(bromomethyl)-2,4,6-trimethylbenzene and 1,4-di(1H-imidazol-1-yl)benzene as raw materials to prepare a reaction mixture, and then introduces nitrogen gas into the reaction mixture to prepare the cationic organic polymer. Sodium perrhenate is dissolved in deionized water to prepare perrhenate solutions of different concentrations (50-1400 mg / L), and then added to 10 mL of ReO4... - Adding 10 mg of the cationic organic polymer TBTTCB to the solution yields the cationic organic polymer p-ReO4. - The maximum adsorption capacity is 678 mg / g.

[0004] CN116284769 A discloses a three-dimensional cationic polymer, its preparation method, and its application. The method involves mixing tetrakis(4-(bromomethyl)phenyl)methane, 2,2′,6,6′-tetramethyl-4,4′-bipyridine, and 1-methyl-2-pyrrolidone, followed by degassing to obtain a reaction solution. This solution is then subjected to a Menschutkin reaction to yield the three-dimensional cationic polymer. 5 mg of the three-dimensional cationic polymer is added to 10 mL of a solution containing different concentrations of perrhenate ions. Calculations show the effect of the three-dimensional cationic polymer on ReO4. - The adsorption capacity is 918.7 mg / g.

[0005] However, the density of effective adsorption sites for rhenium in the above materials is insufficient, and the material structure cannot fully utilize the potential adsorption capacity of rhenium, resulting in limited improvement in adsorption capacity and failing to meet the requirements of efficient rhenium recovery in practical applications. Therefore, it is necessary to develop a cationic polymer material with a higher density of effective adsorption sites and significantly improved adsorption capacity per unit mass from the perspective of material structure design and site construction, and to achieve ultra-high capacity adsorption and efficient recovery of rhenium in rhenium-containing solutions. Summary of the Invention

[0006] The purpose of this invention is to provide a cationic polymer material, its preparation method, and its application in rhenium adsorption and separation. By introducing polypyridine structural units into the polymer backbone and subjecting them to quaternization and anion exchange treatment, a cationic polymer material with high density and uniformly distributed cationic sites is constructed, which significantly increases the number of effective active sites that can participate in rhenium adsorption per unit mass, enabling the cationic polymer material to have an ultra-high adsorption capacity for high rhenium ions.

[0007] To achieve the above objectives, this invention discloses a method for preparing a cationic polymer material, comprising the following steps:

[0008] (1) Under nitrogen protection, 2,4,6-tribromopyridine, pyridine-4-boronic acid and potassium carbonate were added to a dry reaction vessel, and a mixed solvent of tetrahydrofuran and water was added to form a suspension under stirring. Then palladium catalyst was added and the reaction was carried out under nitrogen atmosphere to make the reactants undergo coupling reaction. After the reaction was completed, the mixture was cooled to room temperature and purified by silica gel column chromatography to obtain 2,4,6-tris(4-pyridyl)pyridine.

[0009] (2) The 2,4,6-tris(4-pyridyl)pyridine obtained in step (1) and 5,5′-bis(bromomethyl)-2,2′-bipyridine are added to the reaction vessel in a predetermined molar ratio, and a reaction solvent is added to form a reaction system. The reaction system is subjected to alternating nitrogen purging and vacuuming to remove oxygen from the system and form an inert atmosphere. The reaction system is then sealed under an inert atmosphere and heated at a set temperature to cause the reactants to undergo quaternization polymerization to generate a cationic polymer precursor.

[0010] (3) After the reaction is completed, the reaction system is cooled to room temperature, and the solid cationic polymer precursor is obtained by filtration. The cationic polymer precursor is purified by Soxhlet extraction and dried to obtain the unmethylated cationic polymer.

[0011] (4) The unmethylated cationic polymer obtained in step (3) is dispersed in a polar solvent, and then a methylating agent is added. The reaction is carried out under heating and stirring conditions to methylate the pyridine groups in the polymer backbone.

[0012] (5) After the reaction is completed, the solid product is obtained by filtration and washing. Then, the obtained solid product is added to an aqueous sodium chloride solution for anion exchange treatment. After separation, washing and drying, methylated cationic polymer material is obtained.

[0013] Preferably, in step (1), the molar ratio of 2,4,6-tribromopyridine to pyridine-4-boronic acid is 1:(3-6); the amount of potassium carbonate used is 2-10 times the molar amount of 2,4,6-tribromopyridine; the volume ratio of tetrahydrofuran to water in the mixed solvent is (3-10):1, and the amount ratio of the mixed solvent to 2,4,6-tribromopyridine is 30-50 mL: 1 g; the palladium catalyst is tetra(triphenylphosphine)palladium, and the amount of tetra(triphenylphosphine)palladium used is 1-10 mol% of the molar amount of 2,4,6-tribromopyridine; the coupling reaction is carried out at the reflux temperature of tetrahydrofuran for 6-72 h.

[0014] Preferably, in step (2), the molar ratio of 2,4,6-tris(4-pyridyl)pyridine to 5,5′-bis(bromomethyl)-2,2′-bipyridine is 1:(1-3); the reaction solvent is a polar organic solvent, which is at least one of acetonitrile, N,N-dimethylformamide or mesitylene, and the ratio of the polar organic solvent to the 2,4,6-tris(4-pyridyl)pyridine is (8-25) mL:1 g.

[0015] Preferably, in step (2), the reaction of the reaction system is carried out under a closed inert atmosphere, wherein the inert gas of the inert atmosphere is nitrogen or argon; the temperature of the heating reaction is 80-140 °C, and the reaction time is 12-168 h.

[0016] Preferably, in step (3), the solvent used for Soxhlet extraction is at least one of tetrahydrofuran, methanol, ethanol or water, and the Soxhlet extraction time is 12 to 48 h.

[0017] Preferably, in step (4), the polar solvent is at least one of dichloromethane, anhydrous acetonitrile, or nitrobenzene, and the ratio of the polar solvent to the unmethylated cationic polymer is (100-1000) mL:1 g; the methylating agent is at least one of iodomethane, methyl trifluoromethanesulfonate, or dimethyl sulfate, and the ratio of the methylating agent to the unmethylated cationic polymer is (4-10) mL:1 g.

[0018] Preferably, in step (5), the concentration of the sodium chloride aqueous solution is 0.1-3 mol / L, the ratio of the sodium chloride aqueous solution to the unmethylated cationic polymer is (5-20) mL:5 mg, and the anion exchange treatment time is 4-24 h.

[0019] The present invention also provides a cationic polymer material prepared by the above preparation method.

[0020] The present invention also provides the application of the above-mentioned cationic polymer material in rhenium adsorption and separation. The cationic polymer material is added to a rhenium-containing solution and stirred, so that the cationic polymer material adsorbs and separates rhenium-containing anions in the rhenium-containing solution through ion exchange, thereby achieving the adsorption and separation of rhenium.

[0021] Preferably, the rhenium-containing solution is a rhenium leachate, metallurgical waste liquid, or a simulated rhenium-containing solution.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention introduces polypyridine structural units into the polymer backbone and performs quaternization and anion exchange treatment on them to construct a cationic polymer material with high density and uniformly distributed cationic sites. This significantly increases the number of effective active sites per unit mass that can participate in rhenium adsorption, enabling the cationic polymer material to exhibit an ultra-high adsorption capacity for perrhenate ions that is far higher than that of existing adsorption materials.

[0024] 2. The cationic polymer prepared in this invention, relying on its stable porous structure and strong ion exchange capacity, can still achieve a rapid and efficient adsorption process in low-concentration rhenium-containing solutions, and maintains excellent adsorption selectivity and good reusability under various coexisting anion interference conditions. The ultra-high adsorption capacity and rapid adsorption behavior stem from the specific molecular structure design and site construction method of this invention, effectively overcoming the technical bottleneck of limited adsorption capacity caused by insufficient adsorption site density in traditional adsorption materials. Taking the prepared TPyP-BB2By-Cl as an example, its maximum saturated adsorption capacity calculated based on structural theory reaches 1963.5 mg / g, and the maximum saturated adsorption capacity obtained by fitting using the Langmuir isotherm model is 1716.52 mg / g, indicating that the cationic polymer material has significant technological advancements and broad engineering application prospects in the field of rhenium adsorption and separation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the synthesis of 2,4,6-tris(4-pyridyl)pyridine in this invention;

[0026] Figure 2This is a schematic diagram of the synthesis of the unmethylated cationic polymer in this invention;

[0027] Figure 3 This is a schematic diagram illustrating the synthesis of the cationic polymer material in this invention;

[0028] Figure 4 These are the infrared spectra of 2,4,6-tris(4-pyridyl)pyridine (TPyP), 5,5′-bis(bromomethyl)-2,2′-bipyridine (BB2By), the unmethylated cationic polymer (TPyP-BB2By), and the cationic polymer material (TPyP-BB2By-Cl) in this invention.

[0029] Figure 5 This is the isothermal adsorption fitting curve of the unmethylated cationic polymer in this invention;

[0030] Figure 6 This is the isothermal adsorption fitting curve of the cationic polymer material in this invention;

[0031] Figure 7 The cationic polymer material in this invention is used to react with ReO4. - Adsorption kinetics diagram;

[0032] Figure 8 The cationic polymer material in this invention is used to react with ReO4. - Adsorption selectivity. Detailed Implementation

[0033] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described below in conjunction with specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. All equivalent substitutions or modifications made based on the technical solutions of this invention should fall within the scope of protection of this invention.

[0034] Unless otherwise specified, all raw materials and reagents used in the following examples are commercially available products with a purity of analytical grade or higher.

[0035] Example 1

[0036] Under nitrogen protection, 1.00 g (3.17 mmol) of 2,4,6-tribromopyridine, 1.16 g (9.51 mmol) of pyridine-4-boronic acid, and 2.50 g (18.1 mmol) of potassium carbonate were added to a dry round-bottom flask. 40 mL of a 4:1 mixture of tetrahydrofuran and deionized water was added, and a suspension was formed under stirring. Subsequently, 0.05 g (0.043 mmol) of tetra(triphenylphosphine)palladium was added as a catalyst, and the mixture was heated to reflux under nitrogen atmosphere with vigorous stirring for 72 h. After the reaction was complete, the mixture was cooled to room temperature, and the solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography to give 2,4,6-tris(4-pyridyl)pyridine as a white solid. The reaction formula is as follows. Figure 1 As shown.

[0037] 0.50 g (1.67 mmol) of 2,4,6-tris(4-pyridyl)pyridine and 0.78 g (2.50 mmol) of 5,5′-bis(bromomethyl)-2,2′-bipyridine were added to a reaction vessel, along with 8 mL of acetonitrile as the reaction solvent, to ensure thorough dispersion of the reactants and form a reaction system. The reaction system was then subjected to multiple nitrogen purging treatments to remove oxygen and create an inert atmosphere. The reaction vessel was then sealed under this inert atmosphere and placed in an oven at 100 °C for 72 h to induce quaternization polymerization. After the reaction was complete, the mixture was cooled to room temperature, and the solid product was obtained by filtration. Soxhlet extraction with tetrahydrofuran was performed for 24 h to remove unreacted monomers and low-molecular-weight impurities. The product was then vacuum dried at 60 °C for 24 h to obtain the unmethylated cationic polymer, denoted as TPyP-BB2By. The reaction equation is as follows: Figure 2 As shown.

[0038] 50 mg of the obtained TPyP-BB2By was added to a dry 15 mL round-bottom flask, followed by 5.0 mL of anhydrous acetonitrile. The polymer was then thoroughly dispersed under magnetic stirring. Subsequently, 0.40 mL of methyl trifluoromethanesulfonate was slowly added under nitrogen protection. The reaction system was heated to reflux and stirred for 24 h to induce methylation of the pyridine groups in the polymer backbone.

[0039] After the reaction was completed and cooled to room temperature, the solid product was separated by centrifugation and washed successively with acetonitrile to remove unreacted methylating agents and soluble impurities, followed by washing with anhydrous diethyl ether to further remove residual organic matter, yielding the methylated polymer solid. The solid was added to 20 mL of a 1 mol / L sodium chloride aqueous solution and stirred at room temperature for at least 12 h to achieve anion exchange. After treatment, the solid product was separated by vacuum filtration and washed with deionized water until the filtrate no longer contained significant chloride ions. It was then dried under vacuum at 60 °C for 12 h to obtain the final reddish-brown cationic polymer material, denoted as TPyP-BB2By-Cl. The reaction equation is as follows: Figure 3 As shown.

[0040] Figure 4 These are the infrared spectra of 2,4,6-tris(4-pyridyl)pyridine (TPyP), 5,5′-bis(bromomethyl)-2,2′-bipyridine (BB2By), TPyP-BB2By, and TPyP-BB2By-Cl. Compared to BB2By, TPyP-BB2By and TPyP-BB2By-Cl show stronger infrared spectra at approximately 610 cm⁻¹. -1 The characteristic C-Br absorption peak disappears at approximately 1160 cm⁻¹, while it appears to disappear at 1160 cm⁻¹. -1 C–N appeared at this location. + The characteristic absorption peak indicates that the quaternization reaction has successfully occurred, proving the successful synthesis of the target compound.

[0041] Application Example 1

[0042] Weigh 5 mg of TPyP-BB2By and TPyP-BB2By-Cl prepared in Example 1 and add them to 10 mL of ReO4. - In a solution (20–1400 ppm), stir for at least 12 h until adsorption equilibrium is reached. Separate the solid using a 0.22 μm microporous membrane and detect the ReO4 content in the filtrate using ultraviolet spectrophotometry. - Concentrations were determined to obtain the effects of TPyP-BB2By and TPyP-BB2By-Cl on ReO4. - Calculate the maximum saturated adsorption capacity and plot the isothermal adsorption fitting curve.

[0043] The adsorption performance of TPyP-BB2By is as follows: Figure 5 As shown, the unmethylated TPyP-BB2By on ReO4 - It exhibits high adsorption capacity. Its adsorption behavior is in high agreement with the Langmuir isotherm model, with a correlation coefficient R0. 2= 0.988, indicating that the adsorption process is mainly a monolayer adsorption mechanism. The maximum saturated adsorption capacity was calculated to be 658.36 mg / g. This result demonstrates that the cationic sites formed by quaternization polymerization can effectively interact with ReO4 through ion exchange. - Combine.

[0044] The adsorption performance results of TPyP-BB2By-Cl are as follows: Figure 6 As shown, TPyP-BB2By-Cl, after methylation enhancement and uniform chloride ion exchange treatment, affects ReO4. - The adsorption capacity is significantly improved. Its adsorption behavior also highly conforms to the Langmuir isotherm model, with a correlation coefficient R0. 2 = 0.983, indicating that the cation sites in TPyP-BB2By-Cl are uniformly distributed and the adsorption process is mainly based on monolayer ion exchange. Fitting calculations show that its maximum saturated adsorption capacity reaches 1716.52 mg / g. Compared with unmethylated cationic polymers, the adsorption capacity is increased by more than 2.6 times.

[0045] Application Example 2

[0046] Weigh 5 mg of TPyP-BB2By-Cl prepared in Example 1 and add it to 10 mL of ReO4. - In the solution (20 ppm), after stirring was started, samples were taken at time intervals of 30 s, 1 min, 2 min, 3 min, 5 min, 10 min, 15 min, 20 min, and 30 min, respectively. The samples were filtered, and the ReO4 content in the solution was measured by inductively coupled plasma mass spectrometry. - Concentration, to obtain TPyP-BB2By-Cl for lower concentrations of ReO4 - Adsorption kinetics.

[0047] The results are as follows Figure 7 As shown, TPyP-BB2By-Cl affects ReO4 - It exhibits extremely rapid adsorption kinetics, achieving a removal rate of approximately 70% within 1 minute, exceeding 94% within 5 minutes, and approaching adsorption equilibrium around 20 minutes, with a final removal rate approaching 99%. This indicates that TPyP-BB2By-Cl effectively removes ReO4. - It has rapid and efficient adsorption and separation capabilities.

[0048] Since TPyP-BB2By and TPyP-BB2By-Cl originate from the same three-dimensional crosslinked framework and have the same polymerization conditions, and the post-treatment steps did not change the pore structure and macroscopic morphology of the materials, the significant increase in adsorption capacity cannot be attributed to changes in specific surface area or pore size. Instead, it mainly stems from the additional pyridinium cation sites introduced by secondary methylation and the enhanced ion exchange driving force and site accessibility through unified chloride ion exchange. The high similarity between the theoretical maximum adsorption capacity of 1963.5 mg / g and the experimental value indicates that the vast majority of cation sites in the material can effectively participate in monolayer exchange adsorption, demonstrating the high uniformity of site distribution and the effectiveness of the structural design. Compared to the typical adsorption level of 600–800 mg / g for existing cationic polymers, the capacity leap achieved by this invention through "tripyridine core construction + secondary site enhancement + unified anion exchange" exhibits a significant non-linear improvement characteristic, representing a significant technological advancement exceeding conventional optimization expectations.

[0049] Application Example 3

[0050] Weigh 5 mg of TPyP-BB2By-Cl prepared in Example 1 and add it to 10 mL of ReO4. - In a solution (20 ppm), add an equimolar amount of interfering ions, such as Cl-. - CO3 2- NO3 - SO4 2- and PO4 3- Stir for at least 12 hours, filter, and then measure the ReO4 content in the solution using inductively coupled plasma mass spectrometry. - Concentration, to obtain TPyP-BB2By-Cl for ReO4 - The adsorption separation selectivity.

[0051] The results are as follows Figure 8 As shown, TPyP-BB2By-Cl affects ReO4 - It exhibits extremely high adsorption and separation selectivity, in equimolar Cl - NO3 - SO4 2- CO3 2- and PO4 3- Under conditions of interference with anion coexistence, TPyP-BB2By-Cl affects ReO4 - The removal rate remains above 98%, almost unaffected by interfering ions.

[0052] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A method for preparing a cationic polymer material, characterized in that, Includes the following steps: (1) Under nitrogen protection, 2,4,6-tribromopyridine, pyridine-4-boronic acid and potassium carbonate were added to a dry reaction vessel, and a mixed solvent of tetrahydrofuran and water was added to form a suspension under stirring. Then palladium catalyst was added and the reaction was carried out under nitrogen atmosphere to make the reactants undergo coupling reaction. After the reaction was completed, the mixture was cooled to room temperature and purified by silica gel column chromatography to obtain 2,4,6-tris(4-pyridyl)pyridine. (2) The 2,4,6-tris(4-pyridyl)pyridine obtained in step (1) and 5,5′-bis(bromomethyl)-2,2′-bipyridine are added to the reaction vessel in a predetermined molar ratio, and a reaction solvent is added to form a reaction system. The reaction system is subjected to alternating nitrogen purging and vacuuming to remove oxygen from the system and form an inert atmosphere. The reaction system is then sealed under an inert atmosphere and heated at a set temperature to cause the reactants to undergo quaternization polymerization to generate a cationic polymer precursor. (3) After the reaction is completed, the reaction system is cooled to room temperature, and the solid cationic polymer precursor is obtained by filtration. The cationic polymer precursor is purified by Soxhlet extraction and dried to obtain the unmethylated cationic polymer. (4) The unmethylated cationic polymer obtained in step (3) is dispersed in a polar solvent, and then a methylating agent is added. The reaction is carried out under heating and stirring conditions to methylate the pyridine groups in the polymer backbone. (5) After the reaction is completed, the solid product is obtained by filtration and washing. Then, the obtained solid product is added to an aqueous sodium chloride solution for anion exchange treatment. After separation, washing and drying, methylated cationic polymer material is obtained.

2. The method for preparing the cationic polymer material according to claim 1, characterized in that, In step (1), the molar ratio of 2,4,6-tribromopyridine to pyridine-4-boronic acid is 1:(3-6); the amount of potassium carbonate used is 2-10 times the molar amount of 2,4,6-tribromopyridine; the volume ratio of tetrahydrofuran to water in the mixed solvent is (3-10):1, and the amount ratio of the mixed solvent to 2,4,6-tribromopyridine is (30-50) mL:1 g; the palladium catalyst is tetra(triphenylphosphine)palladium, and the amount of tetra(triphenylphosphine)palladium used is 1-10 mol% of the molar amount of 2,4,6-tribromopyridine; the coupling reaction is carried out at the reflux temperature of tetrahydrofuran for 6-72 h.

3. The method for preparing the cationic polymer material according to claim 1, characterized in that, In step (2), the molar ratio of 2,4,6-tris(4-pyridyl)pyridine to 5,5′-bis(bromomethyl)-2,2′-bipyridine is 1:(1-3); the reaction solvent is a polar organic solvent, which is at least one of acetonitrile, N,N-dimethylformamide or mesitylene, and the ratio of the polar organic solvent to the 2,4,6-tris(4-pyridyl)pyridine is (8-25) mL: 1 g.

4. The method for preparing the cationic polymer material according to claim 1, characterized in that, In step (2), the reaction of the reaction system is carried out under a closed inert atmosphere, and the inert gas in the inert atmosphere is nitrogen or argon; the temperature of the heating reaction is 80 to 140 °C, and the reaction time is 12 to 168 h.

5. The method for preparing the cationic polymer material according to claim 1, characterized in that, In step (3), the solvent used for Soxhlet extraction is at least one of tetrahydrofuran, methanol, ethanol or water, and the Soxhlet extraction time is 12 to 48 hours.

6. The method for preparing the cationic polymer material according to claim 1, characterized in that, In step (4), the polar solvent is at least one of dichloromethane, anhydrous acetonitrile, or nitrobenzene, and the ratio of the polar solvent to the unmethylated cationic polymer is (100-1000) mL:1 g; the methylating agent is at least one of iodomethane, methyl trifluoromethanesulfonate, or dimethyl sulfate, and the ratio of the methylating agent to the unmethylated cationic polymer is (4-10) mL:1 g.

7. The method for preparing the cationic polymer material according to claim 1, characterized in that, In step (5), the concentration of the sodium chloride aqueous solution is 0.1-3 mol / L, the ratio of the sodium chloride aqueous solution to the unmethylated cationic polymer is (5-20) mL:5 mg, and the anion exchange treatment time is 4-24 h.

8. A cationic polymer material prepared by any one of claims 1-7.

9. The application of the cationic polymer material as described in claim 8 in rhenium adsorption separation, characterized in that, The cationic polymer material is added to a rhenium-containing solution and stirred, so that the cationic polymer material adsorbs and separates rhenium-containing anions in the rhenium-containing solution through ion exchange, thereby achieving the adsorption and separation of rhenium.

10. The application of the cationic polymer material according to claim 9 in rhenium adsorption separation, characterized in that, The rhenium-containing solution is a rhenium leaching solution, metallurgical waste liquid, or a simulated rhenium-containing solution.

Images