A metal sulfide ion exchanger / collagen fiber composite aerogel and a preparation method thereof and removal of Sr from an aqueous solution 2+ application of ions

Abstract

The application discloses a metal sulfide ion exchanger / collagen fiber composite aerogel and a preparation method and application of the metal sulfide ion exchanger / collagen fiber composite aerogel for removing Sr 2+ ions in an aqueous solution, and belongs to the technical field of new materials. The metal sulfide ion exchanger / collagen fiber composite aerogel is a sponge-like bulk material; the sponge-like bulk material is formed by interweaving a metal sulfide ion exchanger and collagen fibers. The composite aerogel has fast kinetic response, high adsorption capacity, excellent selectivity and a wide pH value adsorption activity range for removing Sr 2+ ions. The application of the composite aerogel for removing Sr 2+ ions in an aqueous solution not only solves the problems of poor operability and difficulty in recovery from a solution of an existing metal sulfide ion exchanger, but also realizes the reuse of leather industry waste (a source of collagen fibers). The composite aerogel has a wide application prospect in treating radioactive wastewater containing Sr.

Description

Technical Field

[0001] This application relates to a metal sulfide ion exchanger / collagen fiber composite aerogel, its preparation method, and its method for removing Sr from aqueous solutions. 2+ The application of ions belongs to the field of new materials technology. Background Technology

[0002] In a nuclear reactor, 90 Sr is 235 The fission products of U have a long half-life (t). 1 / 2 =28.8 years), high fission yield (5.89%), and strong radioactivity (high β decay energy) are considered a highly dangerous radionuclide (Sci. TotalEnviron. 2021, 76(4), 144-266). 90 Sr is usually in ionic form (Sr 2+ It exists in radioactive waste liquids and has high solubility and easy migration. Therefore, it can easily be transferred into the environment. For example, in a nuclear accident, large quantities... 90 Sr was released, resulting in total radioactivity levels in fish in nearby waters exceeding the limit (100 Bq / kg). Furthermore, Sr... 2+ Chemical properties of Ca 2+ Similarly, it can accumulate in human bone tissue, leading to diseases such as leukemia or cancer (Chem. 2019, 5(4), 977-994). On the other hand, 90 Sr can also be used as a radioactive source in fields such as cancer treatment and coal resource exploration. Therefore, capturing radioactive waste from complex waste liquids is crucial. 90 Sr is of great significance.

[0003] There are currently many methods for removing Sr. 2+ Ions, such as chemical precipitation, solvent extraction, membrane filtration and ion exchange / adsorption (Acta 1998, 81(4), 201-206). Among them, ion exchange is considered one of the most ideal methods due to its simple operation and high removal efficiency. Metal sulfide ion exchangers are a new type of ion exchange material developed in recent years. They exhibit high adsorption capacity, rapid kinetics and high selectivity for capturing radionuclides. This is due to the flexible framework of metal sulfide ion exchangers and the soft Lewis base S 2- The strong interaction between the site and radioactive metal ions. However, most metal sulfide ion exchangers currently exist primarily in powdered crystal form, which presents challenges such as difficulty in recovery from solution, operational inefficiency, and limited practical application. Therefore, there is an urgent need to develop a novel composite material that is easy to operate and conveniently recyclable for the efficient and rapid removal of Sr from aqueous solutions. 2+ ion. Summary of the Invention

[0004] To address the challenges of handling and recycling existing metal sulfide ion exchangers in practical applications, this application provides a technical solution for preparing metal sulfide ion exchanger / collagen fiber composite aerogels. This develops a simple, economical, and environmentally friendly new method for preparing metal sulfide ion exchanger-based composite materials, producing regularly shaped and easily manipulated composites applicable to radioactive Sr... 2+ Ion removal.

[0005] The technical solution adopted in this application is as follows:

[0006] According to one aspect of this application, a metal sulfide ion exchanger / collagen fiber composite aerogel is provided, wherein the metal sulfide ion exchanger / collagen fiber composite aerogel is a sponge-like bulk material;

[0007] The sponge-like bulk material is composed of interwoven metal sulfide ion exchangers and collagen fibers;

[0008] The chemical formula of the metal sulfide ion exchanger is A. x M y M' y' S z ;

[0009] Wherein, A is an alkali metal or a protonated organic amine cation, M is a group IIIA element, M' is a group IVA element, S is sulfur, x ranges from 1 to 4, y ranges from 1 to 4, y' ranges from 1 to 4, and z ranges from 2 to 8.

[0010] Optionally, the size of the sponge-like block material is 1cm to 8cm.

[0011] Optionally, the chemical formula of the metal sulfide ion exchanger is KInSnS4.

[0012] According to another aspect of this application, a method for preparing the above-mentioned metal sulfide ion exchanger / collagen fiber composite aerogel is provided, comprising the following steps:

[0013] S1. Obtain metal sulfide ion exchanger A x M y M' y' S z ;

[0014] S2, Obtain metal sulfide ion exchanger A respectively x M y M' y' S z Suspension, collagen fiber suspension;

[0015] S3. The metal sulfide ion exchanger A from step S2 x M y M' y' S z The suspension and collagen fiber suspension are mixed and stirred to obtain composite flocculants;

[0016] S4. Wash the composite flocculant from step S3 with water until the supernatant is clear, and then freeze-dry the composite flocculant to obtain the metal sulfide ion exchanger / collagen fiber composite aerogel.

[0017] This application obtains metal sulfide ion exchanger A. x M y M' y' S z The method can be achieved through various means, such as hydrothermal or vacuum solid-state methods.

[0018] Optionally, metal sulfide ion exchanger A is obtained. x M y M' y' S z The method includes step S1-a:

[0019] A metal sulfide ion exchanger A is obtained by reacting a raw material containing alkali metal or protonated organic amine cations, an S source, a Group IIIA element metal source, and a Group IVA element metal source. x M y M' y' S z .

[0020] Optionally, the metal source for Group IIIA elements is selected from In powder, the metal source for Group IVA elements is selected from Sn powder, the raw material for the cation of alkali metal or protonated organic amine is selected from potassium carbonate, and the S source is selected from sulfur powder.

[0021] Optionally, the cation source of the alkali metal or protonated organic amine, the S source, the Group IIIA element metal source, and the Group IVA element metal source are in the form of chemical formula A. x M y M' y' S z The reaction is carried out in the molar ratio of the elements in the middle, and the amount of raw materials added is not strictly limited. Those skilled in the art can adjust it as needed.

[0022] Optionally, metal sulfide ion exchanger A is obtained. x M y M' y' S z The method includes step S1-b:

[0023] Will contain A a Mb S c A mixture of materials, an S source, and a Group IVA element metal source is ground and then reacted in a vacuum atmosphere to obtain metal sulfide ion exchanger A. x M y M' y' S z ;

[0024] Where a ranges from 1 to 3, b ranges from 1 to 3, and c ranges from 2 to 4.

[0025] Optionally, in step S1-b, the reaction conditions include: reacting at a reaction temperature of 700℃~800℃ for 80h~120h, then reducing the temperature to 500℃~600℃ within 60h~80h, and then naturally cooling to room temperature after the reaction is completed.

[0026] Optionally, in step S1-b, the metal source of group IVA elements is selected from Sn powder, and the S source is selected from sulfur powder.

[0027] Optionally, in step S1-b, A a M b S c Materials, S source, and Group IVA element metal source in the form of chemical formula A x M y M' y' S z The reaction is carried out in the molar ratio of the elements in the middle, and the amount of raw materials added is not strictly limited. Those skilled in the art can adjust it as needed.

[0028] In this application, A was obtained. a M b S c The material can be processed in a variety of ways, and those skilled in the art can choose the appropriate method as needed.

[0029] Optionally, obtain A a M b S c The methods for materials include S1-a:

[0030] A reaction is carried out in a closed container with a raw material containing an S source, a Group IIIA element metal source, and an alkali metal or protonated organic amine cation to obtain A. a M b S c Material.

[0031] Optionally, in step S1-a, the group IIIA element metal source is selected from In powder, the alkali metal or protonated organic amine cation source is selected from potassium carbonate, and the S source is selected from sulfur powder.

[0032] Optionally, in step S1-a, the reaction conditions include: a reaction temperature of 210℃~230℃ and a reaction time of 36h~72h.

[0033] Optionally, in step S1-a, the S source, the Group IIIA element metal source, and the cation of the alkali metal or protonated organic amine are prepared in the form of chemical formula A. a M b S c The reaction is carried out in the molar ratio of the elements in the middle, and the amount of raw materials added is not strictly limited. Those skilled in the art can adjust it as needed.

[0034] Optionally, in step S2, metal sulfide ion exchanger A x M y M' y' S z The suspension was obtained by the following method: metal sulfide ion exchanger A... x M y M' y' S z Mix with water, ball mill, and then dilute to a fixed volume.

[0035] Optionally, in step S2, A x M y M' y' S z The concentration of the suspension is 4 g / L to 6 g / L.

[0036] Optionally, in step S2, the collagen fiber suspension is obtained by mixing collagen fibers and water, ball milling, and then diluting and adjusting the volume.

[0037] Optionally, in step S2, the concentration of the collagen fiber suspension is 8 g / L to 12 g / L;

[0038] In this application, ion exchanger A x M y M' y' S z When combined with collagen fibers, a suspension is prepared to facilitate the formation of complex flocs.

[0039] Optionally, in step S2, the ball milling time is 12h to 16h, and the ball milling speed is 400r / min to 500r / min.

[0040] Optionally, in step S3, the stirring conditions include: stirring time of 2h to 5h.

[0041] Optionally, in step S3, the metal sulfide ion exchanger A in the composite flocculant x M y M' y' S zThe weight ratio of collagen fibers is 0.5 to 1.25:1.

[0042] Optionally, in step S4, the freeze-drying conditions include a drying time of 50h to 70h.

[0043] According to another aspect of this application, a metal sulfide ion exchanger / collagen fiber composite aerogel prepared according to the above method is also provided as an adsorbent for removing Sr from aqueous solution. 2+ Applications of ions.

[0044] Optionally, the application includes:

[0045] The metal sulfide ion exchanger / collagen fiber composite aerogel was combined with Sr-containing... 2+ Ions come into contact with the solution and are adsorbed;

[0046] The contact can be dynamic or static.

[0047] Optionally, containing Sr 2+ Sr ions in solution 2+ The concentration of ions ranged from 5.29 mg / L to 235.33 mg / L.

[0048] Optionally, containing Sr 2+ The pH of the solution containing the ions is 2–12.

[0049] Optionally, the contact conditions include a contact temperature of 20°C to 35°C.

[0050] Optionally, when the contact is static contact, the contact conditions include: a contact time of 6h to 12h.

[0051] Optionally, when the contact is dynamic contact, it will contain Sr 2+ A solution of ions passes through an adsorption column;

[0052] The adsorption column is filled with the metal sulfide ion exchanger / collagen fiber composite aerogel.

[0053] The beneficial effects that this application can produce include:

[0054] The preparation method of the metal sulfide ion exchanger / collagen fiber composite aerogel provided in this application has a very simple operation process and can be used for large-scale preparation. The process does not involve the use of toxic materials and has low requirements for experimental equipment. The metal sulfide ion exchanger / collagen fiber composite aerogel prepared in this application can convert metal sulfide ion exchanger A... x M y M' y' S zThe effective combination with collagen fibers greatly improves the ease of material handling, while also solving the problems of existing metal sulfide ion exchangers A. x M y M' y' S z The challenges of practical operation and recovery from aqueous solutions were overcome, and the reuse of leather industry waste (a source of collagen fibers) was achieved. Furthermore, this composite aerogel exhibits good performance against Sr... 2+ The removal of ions has the advantages of fast adsorption kinetics, wide pH adsorption activity range, good selectivity, strong operability and easy recovery, which has broad application prospects for the treatment of radioactive wastewater containing strontium ions. Attached Figure Description

[0055] Figure 1 These are photographs of sample 3 from different angles.

[0056] Figure 2 The images are scanning electron microscope (SEM) images of samples 1–3, where (a) is sample 1, (b) is sample 2, and (c) and (d) are sample 3.

[0057] Figure 3 The X-ray powder diffraction (PXRD) patterns are for samples 1, 2, and 3.

[0058] Figure 4 Remove Sr from sample 3 2+ Ion kinetic diagram.

[0059] Figure 5 Remove Sr from sample 3 2+ Isothermal adsorption diagram of ions.

[0060] Figure 6 For sample 3, the effect of Sr on a wide pH range 2+ Distribution coefficient and removal rate of ions.

[0061] Figure 7 For sample 3, Sr adsorption in the column 2+ Data graphs of ions, where (a) is the Sr removed from sample 3 fitted with the Thomas model. 2+ (a) Ion breakthrough curve; (b) Sr removal from sample 3 during column adsorption. 2+ Ion removal rate graph.

[0062] Figure 8 Sr was artificially added to sample 3. 2+ Removal of Sr from real water samples 2+ Distribution coefficient and removal rate of ions. Detailed Implementation

[0063] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0064] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels.

[0065] Collagen fibers are derived from scraps and waste generated during leather production and are purchased from Shenzhen Yongshengye Textile Trading Co., Ltd., product number Y051.

[0066] Unless otherwise specified, all test methods are standard and all instrument settings are those recommended by the manufacturer.

[0067] The scanning electron microscope (SEM) is model JEOL JSM-6700F.

[0068] The inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma emission spectroscopy (ICP-OES) models are XSerise II and Thermo 7400.

[0069] X-ray powder diffraction (XRD) phase analysis was performed using a Miniflex II X-ray diffractometer.

[0070] In the embodiments of this application, the allocation coefficient is calculated in the following manner:

[0071]

[0072] In the embodiments of this application, the removal rate is calculated in the following way:

[0073]

[0074] In the above formula, C0 and C e K represents the initial and equilibrium concentrations of the cesium solution, respectively. d and represent the partition coefficients of ions.

[0075] For the sake of brevity, in this embodiment, the metal sulfide ion exchanger KInSnS4 is named Sample 1, the collagen fiber is named Sample 2, and the metal sulfide ion exchanger KInSnS4 / collagen fiber composite aerogel is named Sample 3.

[0076] Example 1: Preparation of Metal Sulfide Ion Exchanger / Collagen Fiber Composite Aerogel

[0077] Step S1: First, K2CO3 (9 mmol), S powder (9 mmol), In powder (30 mmol), and deionized water (1.5 mL) were mixed and stirred evenly according to the stoichiometric ratio. The mixture was then placed in a polytetrafluoroethylene (PTFE) reactor and kept in an oven at 220°C for 2 days to obtain KInS2 material. Next, KInS2 (3 mmol), S powder (6 mmol), and Sn powder (3 mmol) were mixed evenly in a mortar according to the stoichiometric ratio. The mixture was then transferred to a quartz tube, vacuum-sealed, and placed in an oven at 750°C for 4 days. The temperature was lowered to 550°C over 3 days, and the oven was then closed. After cooling to room temperature, Sample 1 was obtained.

[0078] Step S2: Use ball milling to reduce the particle size of Sample 1 and Sample 2, so that they can be better suspended in water: Put 5 mL of deionized water, 0.5 g of Sample 1 and zirconium beads into a ball milling jar, and ball mill at 400 r / min for 16 hours. After the process, transfer the ball milling suspension in the ball milling jar and dilute it with deionized water to obtain a ball milling suspension of 5 g / L for Sample 1; Put 6 mL of deionized water, 0.40 g of Sample 2 and zirconium beads into a ball milling jar, and ball mill at 400 r / min for 16 hours. After the process, transfer the ball milling suspension in the ball milling jar and dilute it with deionized water to obtain a ball milling suspension of 10 g / L for Sample 2.

[0079] Step S3: Mix 100 mL of ball milled suspension of sample 1 (5 g / L) and 40 mL of ball milled suspension of sample 2 (10 g / L) for 2 hours to obtain a uniform sample 1 / sample 2 composite flocculant.

[0080] Step S4: Wash the flocculant repeatedly with deionized water until the supernatant becomes clear. Then, rapidly freeze the flocculant with liquid nitrogen and freeze-dry for 60 hours to obtain a large, regularly shaped, bright yellow sponge-like metal sulfide ion exchanger / collagen fiber composite aerogel, namely Sample 3 (actual image shown). Figure 1 (As shown).

[0081] Test Example 1 characterizes samples 1 through 3.

[0082] Scanning electron microscopy revealed that sample 1 appeared as a sheet-like structure. Figure 2 a), Sample 2 is fibrous bundle ( Figure 2 b), Sample 3 has an interwoven "network" morphology ( Figure 2 (c-2d). Furthermore, the PXRD patterns of samples 1, 2, and 3 are as follows: Figure 3 As shown, since collagen fibers have an amorphous structure, no obvious diffraction peaks were observed in their PXRD patterns. However, characteristic Bragg peaks corresponding to those of sample 1 appeared in the PXRD pattern of sample 3, indicating that sample 1 and sample 2 were successfully combined.

[0083] Adsorption kinetics test of sample 3 in test example 2

[0084] Sample 3 was mixed with a certain initial concentration of Sr. 2+ The ion solutions were mixed and stirred at room temperature according to the condition m (mass of exchanger):V (volume of solution) = 1 g / L. Small amounts of the supernatant were taken at regular time intervals, and the ion concentrations were determined using inductively coupled plasma atomic emission spectrometry (ICP-AES). The test results are as follows: Figure 4 As shown in Table 1, sample 3 showed a 2-minute reaction time with Sr. 2+ The adsorption of ions has basically reached equilibrium.

[0085] Table 1. Removal of Sr from solution in Sample 3 2+ Ion kinetic results

[0086]

[0087]

[0088] Test Example 3 Sample 3 pairs of Sr 2+ Isothermal adsorption test model for ions

[0089] Sample 3 was mixed with different initial Sr. 2+ The ion solutions were mixed. The mixture was subjected to a shaking incubator at room temperature for 12 hours, with m (mass of exchanger):V (volume of solution) = 1 g / L. After adsorption was complete, the supernatant and the initial solution were collected, and Sr was determined by inductively coupled plasma atomic emission spectrometry. 2+ Ion concentration. Experimental results are as follows: Figure 5 As shown in Table 2, the Langmuir-Freundlich model fits sample 3 pairs of Sr 2+ The maximum adsorption capacity of ions is 41.80 mg / g.

[0090] Table 2. Removal of Sr from solution in sample 3 2+ Isothermal adsorption results of ions

[0091] Initial concentration (mg / L) Equilibrium concentration (mg / L) Adsorption capacity (mg / g) 7.23 0.0011 7.23 14.58 0.075 14.50 30.00 0.94 29.06 63.78 26.76 37.02 95.69 59.14 36.55 235.33 196.73 38.60

[0092] Test Example 4 Sample 3 Sr removal at different pH values 2+ Ion capacity test

[0093] Sample 3 was mixed with Sr at different pH values. 2+ Ion solutions were mixed and subjected to a shaking incubator at room temperature for 12 hours at a ratio of m (exchange resin mass):V (solution volume) of 1 g / L. After adsorption was complete, the supernatant and the initial solution were collected, and Sr was determined by inductively coupled plasma atomic emission spectrometry. 2+ The concentration of ions. The results are as follows: Figure 6 As shown in Table 3, the Sr removal solution provided in this application contains...2+ Ionization methods can efficiently remove Sr over a wide pH activity range. 2+ ion.

[0094] Table 3. Sr removal in Sample 3 at different pH solutions 2+ Results of ions

[0095]

[0096]

[0097] Test Example 5: Application of Sample 3 in Simulated Adsorption Column

[0098] A 50 μm sieve plate was packed into the bottom of a 0.56 cm diameter polyethylene column, and then 0.1 g of sample 3 was injected into the column to a height of approximately 3 cm. Sr was pumped into the column using a peristaltic pump at a flow rate of 0.4 mL / min. 2+ The solution (10.43 mg / L) was pumped into the column, and the effluent was collected every 5 minutes using an automatic collector. The concentration at the midpoint was considered the concentration in the tube.

[0099] Figure 7 a represents the simulated adsorption column of sample 3 for Sr 2+ The breakthrough curve of the ionic solution conforms to the Thomas model, and the maximum uranium adsorption capacity is 58.64 mg / g. Figure 7 b represents the effect of sample 3 on Sr in the column experiment. 2+ The ion removal rate, even at a bed volume of 123, still exceeded 99.28%. This indicates that sample 3 can be used as a column packing material for the removal of Sr. 2+ Dynamic adsorption of ions. Specific data are shown in Table 4:

[0100] Table 4. Removal of Sr-containing compounds using an adsorption column with sample 3 as the column packing material. 2+ Solution results of ions

[0101]

[0102]

[0103] Test Example 6, Sample 3, was treated with simulated radioactive Sr. 2+ Removal of Sr from real water samples 2+ Results of ions

[0104] To determine the adsorption performance of sample 3 in actual water samples, simulated radioactive Sr was added. 2+ Sr ion was tested in tap water, Wulong River water, and Qishan Lake water. 2+ Ion adsorption experiment. Samples 3 were subjected to Sr adsorption in tap water, Wulong River water, and Qishan Lake water. 2+The ion removal rates were 92.40%, 93.94%, and 77.78%, respectively. Figure 8 (and Table 5) indicate that sample 3 has the ability to efficiently remove Sr from complex aquatic environments. 2+ The ability of ions.

[0105] Table 5. Sample 3 after the addition of simulated radioactive Sr 2+ Removal of Sr from real water samples 2+ Results of ions

[0106]

[0107] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A metal sulfide ion exchanger / collagen fiber composite aerogel, characterized by, The metal sulfide ion exchanger / collagen fiber composite aerogel is a sponge-like bulk material. The sponge-like bulk material is interwoven by metal sulfide ion exchanger and collagen fiber. The metal sulfide ion exchanger has a chemical formula of A x M y M ' y' S z ; wherein, A is an alkali metal or a protonated organic amine cation, M is a group IIIA element, M is a group IVA element, S is a sulfur element, x has a value range of 1-4, y has a value range of 1-4, y’ has a value range of 1-4, and z has a value range of 2-8.

2. The metal sulfide ion exchanger / collagen fiber composite aerogel of claim 1, wherein, The size of the sponge-like bulk material is 1 cm-8 cm.

3. Process for the preparation of the metal sulfide ion exchanger / collagen fiber composite aerogel according to claim 1 or 2, characterized in that, The method comprises the following steps: S1, obtaining a metal sulphide ion exchanger A x M y M ' y' S z ; S2, obtaining metal sulfide ion exchanger, respectively A x M y M ' y' S z Suspension, collagen fiber suspension; S3, the metal sulfide ion exchanger of step S2 is heated to a temperature of 300-600°C A x M y M ' y' S z The suspension, the collagen fiber suspension is mixed, stirred, and a composite flocculation body is obtained. S4, washing the composite flocculation body of step S3 to clear supernatant, and then freeze-drying the composite flocculation body to obtain the metal sulfide ion exchanger / collagen fiber composite aerogel.

4. The production method according to claim 3, characterized by, In step S2, the metal sulfide ion exchanger A x M y M y' S z The suspension is obtained by mixing the metal sulfide ion exchanger A x M y M y' S z and water, ball-milling and dilution to volume.​​ 5. The preparation method according to claim 3, characterized in that, In step S2, the collagen fiber suspension is obtained by mixing collagen fiber and water, ball milling, and then diluting and constant volume.

6. The production method according to claim 5, wherein In step S2, the ball milling time is 12 h-16 h, and the ball milling rotation speed is 400 r / min-500 r / min.

7. The preparation method according to claim 3, characterized in that, In step S3, the stirring conditions include that the stirring time is 2 h-5 h.

8. The preparation method according to claim 3, characterized in that, In step S3, the metal sulfide ion exchanger in the composite flocculate A x M y M ' y' S z , the weight ratio of collagen fibers is 0.5-1.25:

1.

9. Metal sulfide ion exchanger / collagen fiber composite aerogel according to claim 1 or 2 or obtainable by the method according to any one of claims 3 to 8 for use as adsorbent material for the removal of Sr2+ ions from aqueous solutions. 2+ ions.

10. Use according to claim 9, characterized in that, The application includes: contacting the metal sulfide ion exchanger / collagen fiber composite aerogel with a solution containing Sr 2+ ions, to effect adsorption; The contact is dynamic contact and / or static contact.

11. Use according to claim 10, characterized in that, Sr 2+ Sr 2+ The concentration of the ions was 5.29 mg / L to 235.33 mg / L.

12. The use according to claim 10, characterized in that, Sr-containing 2+ The pH of the solution of ions is from 2 to 12.

13. The use according to claim 10, characterized in that, The contact conditions include that the contact temperature is 20°C-35°C.

14. The use according to claim 10, characterized in that, When the contact is static contact, the contact conditions include that the contact time is 6 h-12 h.

15. The use according to claim 10, characterized in that, When the contact is a dynamic contact, the solution containing Sr 2+ passing through the adsorption column; The metal sulfide ion exchanger / collagen fiber composite aerogel is filled in the adsorption column.

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