A Cu-Sn-S metal sulfide adsorbent for capturing Ni 2+ from a Cu-Sn-S metal sulfide adsorbent

Abstract

The application discloses a Cu-Sn-S metal sulfide adsorbent for capturing Ni 2+ , and has the molecular formula K 2‑ x Cu x (H2O) x [Cu2Sn2S6], x =0.1~1.9; has a two-dimensional layered structure, each electronegative layer skeleton is sequentially composed of [Sn-Cu-S], [Cu-S] and [Sn-Cu-S] three sub-layers, wherein K + is located in the pores of two [Sn-Cu-S] sub-layers and is used for balancing the charge of the layer skeleton; when Ni 2+ is adsorbed, Cu + in the [Sn-Cu-S] sub-layer is exchanged with Ni 2+ , so that the high-efficiency and high-selectivity capture of Ni 2+ in radioactive wastewater is realized.

Description

Technical Field

[0001] This invention belongs to the field of radioactive wastewater treatment technology, specifically relating to a method for capturing Ni in radioactive wastewater. 2+ Cu-Sn-S metal sulfide adsorbent. Background Technology

[0002] Radioactive contaminants are inevitably produced during the operation of nuclear power reactors. If not dealt with promptly, they will pose a significant threat to public safety.

[0003] Currently, domestic and international methods for treating Ni-containing substances are being developed. 2+ The main methods for treating radioactive wastewater include chemical precipitation, evaporation and concentration, membrane treatment, biological treatment, and adsorption. Among these methods, adsorption is characterized by its simplicity, environmental friendliness, high selectivity, and low chemical reagent consumption, making it the mainstream method for both routine and emergency treatment of radioactive wastewater. In the radioactive wastewater treatment system following the Japanese nuclear accident, adsorption played an irreplaceable role as a core technology. Although there are many types of adsorbents available, most are ineffective in high-salt, strongly acidic / alkaline, radioactive, and high-temperature environments. Therefore, developing an adsorbent suitable for such environments is of great significance.

[0004] Metal sulfides are a new class of adsorbent materials whose structure consists of S-containing compounds. 2- The framework and the guest cations between the frameworks are composed of cations that can be easily exchanged with other metal ions, thus enabling the adsorption of metal sulfides. The most distinctive feature of this type of material is the sulfur (S) in the framework. 2- Ligands. According to Pearson's hard-soft acid-base theory, S 2- The ligand belongs to a soft base and is compatible with soft acids (Sr). 2+ Cs + and Ni 2+ (etc.) have a natural strong affinity, while hard acids (H) + Na + Ca 2+ and Mg 2+ The binding force of metal sulfide adsorbents is relatively weak. Thanks to this characteristic, metal sulfide adsorbents have the characteristics of fast adsorption speed, good adsorption selectivity, acid and alkali resistance and radioactivity resistance. Therefore, they have a good removal effect on various nuclides and are expected to become a new generation of radioactive wastewater adsorption materials. However, in the Cu-Sn-S system of metal sulfides, although Rb2Cu2Sn2S6 (Chemistry of Materials, 1993, 5(10): 1561-1569), (dienH2)Cu2Sn2S6 (Inorganic Chemistry, 2008, 47(20): 9606-9611) and K have been reported, the binding force of metal sulfides is relatively weak. 11 Cu32 Sn 12 S 48 Synthetic methods for materials such as ·4H2O (Inorganic Chemistry, 2015, 54(11): 5301-5308) have been developed, but these materials do not possess adsorption properties. Zhang et al. synthesized (H2en)2Cu8Sn3S using a solvothermal method. 12 The material structure was found to contain (H2en). 2+ Able to interact with Na + K + Cs + The material undergoes partial ion exchange with monovalent metal ions, but this material is sensitive to Ca... 2+ and Sr 2+ Divalent metal ions show almost no adsorption activity (Chemical Communications, 2010, 46(25): 4550-4552). Therefore, there is an urgent need to develop adsorption technologies for Ni. 2+ Cu-Sn-S metal sulfide materials with good adsorption properties. Summary of the Invention

[0005] The purpose of this invention is to provide a method for capturing Ni 2+ A Cu-Sn-S metal sulfide adsorbent. This adsorbent is used to capture Ni in water. 2+ At this time, it has the characteristics of fast adsorption speed and high selectivity, and can even efficiently remove Ni from seawater. 2 + For Ni-containing environments in complex environments 2+ The efficient treatment of radioactive wastewater is of great significance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for capturing Ni 2+ A Cu-Sn-S metal sulfide adsorbent, wherein the molecular formula of the adsorbent is K. 2-x Cu x (H2O) x [Cu2Sn2S6]( x =0.1~1.9), with a two-dimensional layered structure. Each electronegativity layer framework is composed of three sublayers stacked sequentially: [Sn-Cu-S], [Cu-S], and [Sn-Cu-S]. + Located in the pores of the two [Sn-Cu-S] sublayers, it serves to balance the charge of the layer framework. Cu in the [Sn-Cu-S] sublayers + Ni 2+ Exchange to achieve Ni exchange in radioactive wastewater 2+ Highly efficient and selective capture.

[0008] Preferably, the adsorbent crystal material belongs to the monoclinic crystal system with space group . C 2 / c The unit cell parameters are a = 10.93~10.94 Å, b = 10.93~10.94 Å, c = 19.66~19.67 Å. α =90°, β =97.97~97.98°, γ =90°, Z=8.

[0009] The preparation method of the adsorbent includes the following steps: adding KOH, Cu powder, Sn powder and S powder into a hydrothermal reactor, mixing them evenly, and then adding deionized water; sealing the hydrothermal reactor and reacting for a period of time; and washing the product after the reaction with ultrapure water, ethanol and carbon disulfide in sequence and then drying it.

[0010] Preferably, the amount of KOH used is 12-60 mmol, and more preferably 48 mmol.

[0011] Preferably, the amount of Cu powder used is 2~36 mmol, more preferably 24 mmol.

[0012] Preferably, the amount of Sn powder used is 12-60 mmol, and more preferably 24 mmol.

[0013] Preferably, the amount of S powder used is 72~120 mmol, more preferably 90 mmol.

[0014] Preferably, the amount of deionized water used is 1~30 mL, and more preferably 2 mL.

[0015] Preferably, the reaction time is 0.5 to 3 days, and more preferably 1 day.

[0016] Preferably, the reaction temperature is 150~250℃, and more preferably 200℃.

[0017] The adsorbent captures Ni in simulated radioactive wastewater. 2+ The method includes the following steps: reacting an adsorbent with a substance containing Ni 2+ The simulated radioactive wastewater is contacted and adsorbed, allowing the water treatment agent to capture Ni in the solution. 2+ .

[0018] Optionally, the adsorbent captures Ni 2+ The temperature ranges from 10 to 80℃.

[0019] Optionally, the contact time is 1 to 24 hours.

[0020] Optionally, the adsorbent contains Ni 2+ The simulated radioactive wastewater contact reached adsorption equilibrium within 1 hour.

[0021] The simulated radioactive wastewater contains Ni 2+ The concentration ranges from 3 to 1000 ppm.

[0022] Optionally, the Ni-containing 2+ The pH of the simulated radioactive wastewater is 3-11.

[0023] The adsorbent maintains structural and performance stability within a pH range of 3 to 11.

[0024] Optionally, the contact method includes:

[0025] Powder and / or crystal adsorption with Ni-containing 2+ The solution is in contact with the solution for a certain period of time.

[0026] Optionally, the contact method includes:

[0027] Will contain Ni 2+ Wastewater is passed through a chromatography column to capture Ni in the wastewater. 2+ ;

[0028] The chromatography column is filled with an adsorbent. This captures Ni... 2+ The method involves using an adsorbent-filled ion separation chromatography column to separate Ni 2+ The mixed solution has removal capabilities, with a removal rate of up to 99.6% at room temperature.

[0029] Optionally, the adsorption on Ni under neutral conditions 2+ The adsorption capacity is not less than 23.25 mg / g.

[0030] Optionally, the Ni-containing 2+ The simulated radioactive wastewater also includes the following coexisting ions: K + Na + Ca 2+ Mg 2 + 、Sr 2+ Cs + Mn 2+ Co 2+ .

[0031] Optionally, the Ni-containing 2+ The concentration of coexisting ions in the simulated radioactive wastewater ranged from 0 to 100 mmol / L.

[0032] Optionally, the Ni-containing 2+ Ni in simulated radioactive wastewater2+ With various ions such as K + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ Co 2+ In the case of one or more ions coexisting in Ni 2+ It has high selectivity and a removal rate of up to 99.9%.

[0033] The Cu-Sn-S metal sulfide adsorbent provided in this application shares structural similarities with existing Cu-Sn-S metal sulfides (such as Rb₂Cu₂Sn₂S₆ and (dienH₂)Cu₂Sn₂S₆), but also exhibits significant differences. The structures of Rb₂Cu₂Sn₂S₆ and (dienH₂)Cu₂Sn₂S₆ consist of an electronegative layer framework ([Cu₂Sn₂S₆)). 2- ) and balanced cations (Rb + and dienH2 2+ It is composed of an electronegative layer framework [Cu2Sn2S6]. 2- It is composed of three sublayers stacked sequentially: [Sn-S], [Cu-S], and [Sn-S]. The Cu-Sn-S sulfide adsorbent provided in this application also consists of an electronegative layer framework and a balanced cation (K). + The composition differs in that each electronegative layer framework is composed of three sublayers stacked sequentially: [Sn-Cu-S], [Cu-S], and [Sn-Cu-S], while K... + Located in the pores of two [Sn-Cu-S] sublayers; wherein, Cu in the [Sn-Cu-S] sublayer + Can be used with Ni 2+ Exchange, Ni 2+ Replace Cu + A [Sn-Ni-S] sublayer is subsequently formed, with strong interactions between Ni and S, and an average bond length of 2.162 Å. These structural differences result in the excellent adsorption capacity of the Cu-Sn-S metal sulfide adsorbent provided in this application for Ni… 2+ It exhibits strong selectivity and can even efficiently remove Ni from high-salt environments such as seawater. 2+ Such excellent Ni adsorption 2+ This capability is not possessed by previously reported Cu-Sn-S metal sulfides.

[0034] Furthermore, although the Cu-Sn-S metal sulfide adsorbent provided in this application is obtained through Cu + with Ni 2+ Ni in wastewater is adsorbed through ion exchange mechanisms.2+ However, in the adsorption of Ni 2+ No Cu was detected being released into the water during the process. This is because the exchanged Cu... + It is easily oxidized to Cu 2+ Then with OH - (Adsorbed Ni) 2+ The solution becomes alkaline, therefore a large amount of OH- is present in the solution. - Cu(OH)2 is generated and deposited on the surface of the adsorbent.

[0035] The beneficial effects that this application can produce include:

[0036] (1) The method for synthesizing Cu-Sn-S metal sulfide adsorbent provided in this application is simple and can be prepared in batches. The prepared Cu-Sn-S metal sulfide has a stable structure and is effective against Ni. 2+ It exhibits rapid adsorption speed and high selectivity, overcoming the bottleneck of poor adsorption performance of existing Cu-Sn-S metal sulfides, and can provide adsorption for Ni-containing metal sulfides. 2+ New materials and technologies are being developed for the treatment of radioactive wastewater.

[0037] (2) The Ni capture provided in this application 2+ The method, in Ni 2+ With various ions such as K + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ Co 2+ In the case of one or more ions coexisting, for Ni 2+ The removal rate is as high as 99.9%, effective for Ni in mineral water, tap water, and lake water. 2+ The removal rate is also higher than 99%, and it can even remove 90% of Ni in seawater. 2+ This method is suitable for Ni-containing environments in high-salt conditions. 2+ The efficient treatment of radioactive wastewater has important reference value.

[0038] (3) The Cu-Sn-S metal sulfide provided in this application does not release heavy metals such as Cu and Sn into the water during the adsorption process and does not produce secondary pollution. Therefore, it is an environmentally friendly green adsorbent. Attached Figure Description

[0039] Figure 1 (a) is a photograph of the Cu-Sn-S metal sulfide adsorbent prepared in Example 1; (bd) is a schematic diagram of the two-dimensional layered structure of the material.

[0040] Figure 2Removal of Ni by Cu-Sn-S Metal Sulfide Adsorbent 2+ The dynamic curve diagram.

[0041] Figure 3 Removal of Ni by Cu-Sn-S Metal Sulfide Adsorbent 2+ The adsorption isotherm curve.

[0042] Figure 4 In (a), Cu-Sn-S metal sulfide adsorbents react with different concentrations of K in solution. + Na + Ca 2+ Mg 2 + 、Sr 2+ Cs + Mn 2+ and Co 2+ Coexistence of Ni 2+ (a) The removal effect diagram; (b) The adsorbent reacts simultaneously with 5 mg / L K in the solution. + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ and Co 2+ Coexistence of Ni 2+ (c) Graphs showing the removal effect of ions; (d) shows the effect of the adsorbent on Ni in deionized water, mineral water, tap water, lake water and seawater backgrounds. 2+ The result of the removal is shown in the image.

[0043] Figure 5 (a) shows the effect of Cu-Sn-S metal sulfide adsorbent on Ni in the initial pH range of 1 to 11. 2+ (a) The removal effect diagram; (b) The adsorbent adsorbs Ni in pure water and solutions with different pH values. 2+ XRD patterns of the samples after ionization, with the pH range of the solution being 1–12; (c) shows the Cu adsorbent at different pH values. 2+ The leaching concentration of ions.

[0044] Figure 6 (a) shows the Ni ion exchange column. 2+ (a) Penetration curve; (b) Ni after treating simulated radioactive wastewater with different bed volumes 2+ Removal rate. Detailed Implementation

[0045] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0046] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels.

[0047] The analysis method in the embodiments of this application is as follows:

[0048] Inductively coupled plasma emission spectroscopy (ICP-OES) was performed on the Avio 200 device.

[0049] In the embodiments of this application, the removal rate is calculated in the following manner;

[0050] R= ( C 0- C e ) / C 0*100%

[0051] In formula (1), C 0 and C e Representing Ni 2+ Initial and equilibrium concentrations of the solution, in mg / L.

[0052] Example 1: Preparation of Cu-Sn-S metal sulfide adsorbent

[0053] 48 mmol KOH, 24 mmol Cu powder, 24 mmol Sn powder, and 90 mmol S powder were added to a hydrothermal reactor and mixed thoroughly. Then, 2 mL of deionized water was added. The reactor was sealed and reacted at 200 °C for 1 day. The product was then washed sequentially with ultrapure water, ethanol, and carbon disulfide, and dried at 80 °C. The resulting products were a black powder and black blocky single crystals. Figure 1 (a) Analysis of the black single-crystal structure using single-crystal X-ray diffraction reveals that the crystalline material belongs to the monoclinic crystal system with space group 1. C 2 / c The unit cell parameters are a = 10.93 Å, b = 10.93 Å, and c = 19.66 Å. α =90°, β =97.97° γ =90°, Z=8. Crystal structure as follows Figure 1 As shown in Figure b, it is a two-dimensional layered structure consisting of an electronegative layer framework and a balanced cation (K). + The framework consists of three sublayers: [Sn-Cu-S], [Cu-S], and [Sn-Cu-S], stacked sequentially. Figure 1 (bc), while hydrated K + Located in the pores of two [Sn-Cu-S] sublayers ( Figure 1 (d).

[0054] Example 2: Cu-Sn-S metal sulfide adsorbent captures Ni 2+ Dynamics test

[0055] The adsorbent powder prepared in Example 1 was mixed with a solution containing 5 ppm Ni 2+ The simulated radioactive wastewater was mixed and stirred at room temperature. m (Adsorbent mass): V (Solution volume) = 1 g / L. Small amounts of the suspension were taken at regular intervals, filtered through a 0.45 μm filter, and the Ni content in the filtrate was determined by ICP-OES. 2+ concentration. Figure 2 For Ni 2+ Concentration changes and Ni 2+ A graph showing the removal rate over time. Figure 2 It can be seen that the adsorbent has a high affinity for Ni. 2+ It has a fast adsorption rate and can reach adsorption equilibrium within 40 minutes.

[0056] Example 3: Cu-Sn-S metal sulfide adsorbent captures Ni 2+ Adsorption isotherm test

[0057] The adsorbent powder prepared in Example 1 was reacted with 5-500 ppm of Ni-containing... 2+ Simulated radioactive wastewater was mixed, and the mixture was stirred at 25°C for 24 hours. m (Adsorbent mass): V (Solution volume) = 1 g / L. After the reaction was complete, the suspension was taken, filtered through a 0.45 μm filter, and the Ni content in the filtrate was determined by ICP-OES. 2+ Concentration. Experimental results are as follows: Figure 3 According to the Langmuir model fitting, the adsorbent's effect on Ni 2+ The maximum adsorption capacity can reach 23.25 mg / g.

[0058] Example 4: Coexisting ion pair adsorbent captures Ni 2+ Impact Test

[0059] The adsorbent powder prepared in Example 1 was reacted with K containing different concentrations. + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ Co 2+ The mixture of ionic aqueous solutions contains Ni. 2+ The concentration of all components was 5 mg / L, and the mixture was stirred at 25°C for 24 hours. m (Adsorbent mass):V (Solution volume) = 1 g / L. After the reaction was complete, the suspension was taken, filtered through a 0.45 μm filter, and the Ni content in the filtrate was determined by ICP-OES. 2+ Concentration. Test results are as follows: Figure 4 As shown in (a), in competitive K + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ Co 2+ Even in the presence of excess ions, the adsorbent can still selectively remove Ni. 2+ Ions. The Ni captured in water provided in this application 2 + The method can make Ni 2+ With alkali metal and / or alkaline earth metal ions K + Na + Ca 2+ Mg 2+ and radioactive nuclide ions Sr 2+ Cs + Mn 2+ Co 2+ Separation, achieving Ni 2+ Highly efficient removal.

[0060] Example 5 Adsorbent for Ni 2+ Selective testing

[0061] The adsorbent powder prepared in Example 1 was mixed with K at a concentration of 5 mg / L. + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ Co 2+ Ni 2+ The ion-water solution was mixed, and the mixture was stirred at 25°C for 24 hours. m (Adsorbent mass): V (Solution volume) = 1 g / L. After the reaction was complete, the suspension was taken, filtered through a 0.45 μm filter, and the Ni content in the filtrate was determined by ICP-OES. 2+ Concentration. Test results are as follows: Figure 4 As shown in (b), in K + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn2+ Co 2+ Even with the presence of ions, the adsorbent can still selectively remove Ni. 2+ Ions. It is generally believed that when the partition coefficient is greater than 10... 4 At a concentration of mL / g, the adsorbent can efficiently remove pollutants. The adsorbent in the mixed solution has a high tolerance for Ni. 2+ The partition coefficient of the ions reaches 10. 6 It has a concentration of over mL / g and exhibits extremely high selectivity.

[0062] Example 6: Adsorbent captures Ni in a real water body background 2+ Test

[0063] Tap water (TW), mineral water (MW), lake water (LW), and seawater (SW) were selected as actual water bodies, and Ni was added to them. 2+ To simulate exposure to radioactive Ni 2+ The actual polluted water body, and with the addition of Ni 2+ Deionized water (DW) was used as a control group, and a simulated Ni concentration of 5 mg / L was prepared. 2+ The contaminated solutions included: pure water produced by a laboratory water purifier; tap water from the laboratory; commercially available Nongfu Spring mineral water; lake water from Furong Square of Minjiang University; and seawater from Sansha Bay in Fuzhou, Fujian Province. The concentrations of potassium (K) in different water bodies were also analyzed. + Na + Ca 2+ Mg 2+ The mass concentrations are summarized in Table 1.

[0064] The adsorbent powder prepared in Example 1 was mixed with different actual water solutions, and the mixtures were stirred at 25°C for 24 hours. m (Adsorbent mass): V (Solution volume) = 1 g / L. After the reaction was complete, the suspension was taken, filtered through a 0.45 μm filter, and the Ni content in the filtrate was determined by ICP-OES. 2+ Concentration. Test results are as follows: Figure 4 As shown in (c), the results indicate that the adsorbent is effective against Ni in mineral water, tap water, and lake water. 2+ Removal performance (removal rate >99.7%) K d >10 5 The removal performance (mL / g) is comparable to that in deionized water (removal rate = 99.71%). K d =3.68×10 5 (mL / g), even in seawater matrix, Ni 2+ The removal rate was still as high as 90.28%. Kd Approximately 10 4 mL / g. Therefore, the adsorbent is effective against Ni in water environments with high salinity. 2+ The removal of [the substance] exhibits significant selectivity.

[0065] Table 1

[0066]

[0067] Example 7: Adsorbent captures Ni at different pH levels 2+ Ability Test

[0068] The adsorbent powder prepared in Example 1 was mixed with Ni at different pH values. 2+ The ion-water solution was mixed, and the mixture was stirred at 25°C for 24 hours. m (Adsorbent mass): V (Solution volume) = 1 g / L. After the reaction was complete, the suspension was taken, filtered through a 0.45 μm filter, and the Ni content in the filtrate was determined by ICP-OES. 2+ Concentration. Test results are as follows: Figure 5 As shown in (a), the adsorbent maintains its resistance to Ni within a pH range of 1–11. 2+ Ion removal activity. Even at pH=3, for Ni 2+ Ions removal rate remains high (98.0%).

[0069] The adsorbent powder after adsorption was dried and then subjected to X-ray powder diffraction analysis. The results are as follows: Figure 5 As shown in (b), the adsorbent maintains the same structure within a pH range of 3–12, indicating that the adsorbent has high acid and alkali resistance. After adsorption, the suspension was filtered through a 0.45 μm filter, and the Cu content in the filtrate was determined by ICP-OES. 2+ Concentration, results as follows Figure 5 As shown in (c), the adsorbent adsorbs Ni 2+ Cu was not leached during the process. 2+ Ions are environmentally friendly materials.

[0070] The application provides for capturing Ni in water 2+ The method for Ni over a wide pH range 2+ It has a strong removal ability.

[0071] Example 8: Application of Adsorbent in Ion Exchange Columns

[0072] Approximately 2.4035 g of adsorbent crystal sample was packed into an ion exchange column with an inner diameter of 10 mm. Ni at a concentration of 5 ppm was then added. 2+Simulated radioactive wastewater flowed through the exchange column, and the solution at the column outlet was collected at different time intervals. After filtration through a 0.45 μm filter, the Ni content in the filtrate was determined by ICP. 2+ The concentration. Figure 6 Figure (a) shows the breakthrough curve of this ion exchange column. Clearly, this ion exchange column is effective for Ni-containing... 2+ The simulated radioactive wastewater exhibits good treatment capacity, long service life, and large treatment capacity. When treating 1600 bed volumes (BV) of simulated radioactive wastewater, Ni... 2+ The removal rate is still as high as 90%, indicating that the adsorbent can effectively remove Ni under dynamic conditions. 2+ .

[0073] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A Cu-Sn-S metal sulfide adsorbent for capturing Ni in radioactive wastewater 2+ The method is characterized by, Adding adsorbent containing Ni 2+ In radioactive wastewater, adsorption can capture Ni in the solution. 2+ The molecular formula of the adsorbent is K. 2-x Cu x (H2O) x [Cu2Sn2S6], x =0.1~1.9; It has a two-dimensional layered structure, and each electronegativity layer framework is composed of three sublayers stacked sequentially: [Sn-Cu-S], [Cu-S], and [Sn-Cu-S], where K + Located in the pores of the two [Sn-Cu-S] sublayers, it is used to balance the charge of the layer framework; for Ni 2+ During adsorption, Cu in the [Sn-Cu-S] sublayer + Be Ni 2+ Exchange to achieve Ni exchange in radioactive wastewater 2+ Highly efficient and selective capture.

2. The method according to claim 1, characterized in that, The Cu-Sn-S metal sulfide adsorbent crystal material belongs to the monoclinic crystal system and has a space group of [missing information]. C 2 / c The unit cell parameters are a = 10.93~10.94 Å, b = 10.93~10.94 Å, c = 19.66~19.67 Å. α =90°, β =97.97~97.98°, γ =90°, Z=8.

3. The method according to claim 1 or 2, characterized in that, The preparation method of Cu-Sn-S metal sulfide adsorbent includes the following steps: adding KOH, Cu powder, Sn powder and S powder into a hydrothermal reactor, mixing evenly and then adding deionized water; sealing the hydrothermal reactor and reacting for a period of time; and washing the product after reaction with ultrapure water, ethanol and carbon disulfide in sequence and then drying it.

4. The method according to claim 3, characterized in that, The amount of KOH used is 12-60 mmol, the amount of Cu powder used is 2-36 mmol, the amount of Sn powder used is 12-60 mmol, the amount of S powder used is 72-120 mmol, and the amount of deionized water used is 1-30 mL.

5. The method according to claim 3, characterized in that, The reaction temperature is 150~250℃, and the reaction time is 0.5~3 days.

6. The method according to claim 1, characterized in that, Adsorbent captures Ni 2+ The temperature range is 10~80℃; the adsorption time is 1~24 hours.

7. The method according to claim 1, characterized in that, Radioactive wastewater contains Ni 2+ The concentration ranges from 3 to 1000 ppm.

8. The method according to claim 1, characterized in that, The pH of radioactive wastewater is 3-11.

9. The method according to claim 1, characterized in that, Radioactive wastewater also contains the following coexisting ions: K + Na + Ca 2+ Mg 2+ 、Sr 2+ Cs + Mn 2+ Co 2+ .

Images