Preparation methods of strontium-based metal-organic framework materials and their applications in separating water and heavy water.

Abstract

This invention discloses a method for preparing strontium-based metal-organic framework materials and their application in separating water and heavy water, belonging to the field of environmental functional materials preparation and application. The preparation method includes: dispersing a strontium source and an organic ligand in a mixed solution, and reacting them in a reactor to obtain the strontium-based metal-organic framework material. This method does not require strong acids or bases, and the raw materials used in the synthesis are inexpensive, allowing for large-scale preparation. The strontium metal center coordinates with both the carboxyl and hydroxyl groups in the organic ligand, thus the prepared strontium-based metal-organic framework material exhibits good water stability and demonstrates excellent water and heavy water adsorption and separation performance at room temperature. Compared with the traditional distillation method (separation factor 1.02), the H2O / D2O adsorption ratio is increased by 24%, which is expected to achieve efficient separation of low-content D2O under practical conditions, significantly reducing the energy consumption required for water isotope separation.

Description

Technical Field

[0001] This invention belongs to the field of environmental functional materials preparation and application, and relates to a method for preparing a flexible ultraporous metal-organic framework material and its application in the field of water and heavy water separation. Background Technology

[0002] The separation of hydrogen isotopes is one of the most challenging research areas in modern separation technology. Heavy water, as the most important isotope of water, is widely used in basic research and industry. In nature, heavy water always coexists with water, with an extremely low deuterium-to-hydrogen ratio of only 150 ppm; moreover, they have the same atomic number and similar chemical properties, with the boiling points of D₂O and H₂O differing by only 1.42℃. However, the concentration of D₂O required in industrial reactions is as high as 99.75 mol%, requiring hundreds of cycles from natural water to heavy water, resulting in a very low separation factor (1.02) and extremely high energy consumption. Despite numerous attempts, efficient separation of water and heavy water at room temperature remains elusive. Therefore, developing a simple and rapid method for separating water and heavy water is crucial for meeting industrial and scientific needs.

[0003] In recent years, various porous materials such as carbon nanotubes, zeolites, mesoporous silica and metal-organic frameworks have been widely used for the separation of hydrogen isotopes. Among them, metal-organic frameworks have attracted widespread attention due to their large specific surface area, highly tunable crystal structure and good chemical stability, and have made some research progress in the field of hydrogen isotope separation.

[0004] Metal-organic frameworks (MOFs) primarily rely on quantum sieving of pores to separate water and heavy water. This involves precisely designing the pore size of the quantum sieve to amplify the difference in diffusion rates between water and heavy water within the pores, achieving efficient separation. However, most MOFs are coordination polymers, and their structures are prone to collapse in aqueous environments, limiting their practical application. To address these issues, CN115337915A discloses a method to improve the water stability of MOFs, synthesizing a water-stable core-shell MOF through a two-step process. However, due to the poor hydrophilicity of the rare-earth outer shell MOF, it does not adsorb water molecules at room temperature, making it difficult to achieve efficient separation of water and heavy water using quantum sieving.

[0005] There is an urgent need to develop a method for preparing metal-organic framework materials with good hydrophilicity and high stability, which can achieve efficient separation of water and heavy water simply through quantum sieving of the pores at room temperature. Summary of the Invention

[0006] The present invention aims to provide a method for preparing a strontium-based metal-organic framework (MOF) material for separating water and heavy water at room temperature. This MOF possesses advantages such as good stability, high hydrophilicity, low cost, and scalability. The adsorbent uses a strontium salt with a high coordination number as the metal source, and a MOF with a small pore structure is prepared via a hydrothermal method, enabling efficient separation of heavy water and water at room temperature through quantum sieving.

[0007] To achieve the above objectives, the present invention provides the following solution.

[0008] Firstly, this invention provides a method for preparing strontium-based metal-organic framework materials. The metal-organic framework is prepared by hydrothermal synthesis using soluble strontium-containing compounds as metal ions and organic ligands in a solution of a certain volume. Although Sr is an alkaline earth metal, its large atomic radius and 18-electron rule exhibit typical transition metal bonding characteristics. The gain and loss of its d-orbital electrons allow for more coordination modes in the synthesis of metal-organic frameworks. Furthermore, the non-toxic, harmless, and highly water-stable properties of alkaline earth metals enable long-term and effective separation of water and heavy water under high humidity conditions.

[0009] The preparation method includes the following steps:

[0010] S1 Disperses a soluble strontium-containing compound and an organic ligand in a mixed solvent to obtain a homogeneous solution;

[0011] S2 Take the above homogeneous solution and carry out a hydrothermal reaction;

[0012] S3 involves centrifuging, filtering, washing, and drying the hydrothermal reaction product from step S2 to obtain a strontium-based metal-organic framework material.

[0013] Further, the soluble strontium-containing compound mentioned in step S1 is selected from one or more of SrCl2, SrBr2, SrI2, Sr(NO2)2, Sr(NO3)2, Sr(ClO3)2, Sr(ClO4)2, Sr(BrO3)2, Sr(CN)2 and Sr(OH)2, preferably one or more of SrCl2, Sr(NO3)2 and Sr(OH)2.

[0014] Further, the organic ligands mentioned in step S1 include hydroxycarboxylic acid organic ligands, 2,5-dihydroxyterephthalic acid, and 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid, and also include structural analogs, homologues, isomers, and derivatives obtained through various chemical modifications of the above organic ligands. These modifications include substitution reactions on the aromatic ring, modification of the carbon skeleton, and heteroatom doping, such as... Figure 1 As shown.

[0015] Further, in step S1, the molar ratio of the soluble strontium-containing compound to the organic ligand is (1~10):(1~10).

[0016] Further, the mixed solvent in step S1 is a mixture of anhydrous ethanol, deionized water and N,N-dimethylformamide (DMF); preferably, the volume ratio of anhydrous ethanol, deionized water and N,N-dimethylformamide (DMF) in the mixed solvent is (1~10):(1~10):(1~10); preferably, the dispersion method is microwave ultrasound; more preferably, the microwave ultrasound time is 5-30 min.

[0017] Furthermore, the temperature of the hydrothermal reaction in step S2 is 80-150℃, and the reaction time is 6-72h.

[0018] Furthermore, in step S3, the centrifugal filtration of the strontium-based metal-organic framework is performed at a rotation speed of 4000-1000 r / min for a centrifugation time of 4-10 min.

[0019] Further, in step S3, the solvent used for washing includes N,N-dimethylformamide (DMF) and methanol. Preferably, the solvent used for washing includes N,N-dimethylformamide (DMF) and methanol; more preferably, the washing is first performed with N,N-dimethylformamide, and then with methanol.

[0020] Further, in step S3, the drying is vacuum drying; preferably, the vacuum drying temperature is 40-100℃ and the time is 2-8h.

[0021] Secondly, the present invention provides a strontium-based metal-organic framework material, wherein the microporous strontium-based metal-organic framework material is obtained by the preparation method described in the first aspect, and the prepared metal-organic framework has uniformly distributed pore size and high hydrophilicity.

[0022] Thirdly, the present invention provides a use of the strontium-based metal-organic framework material as described in the second aspect for the adsorption and separation of water and heavy water at room temperature.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) This invention is the first to use strontium salt and organic ligand to prepare microporous strontium-based metal-organic framework materials through a one-step hydrothermal synthesis method, which expands the types of metal-organic framework materials. This method does not require the use of strong acid and strong base substances and has the characteristics of being inexpensive, fast, efficient and environmentally friendly.

[0025] (2) Compared with commonly used adsorbents such as activated carbon, molecular sieves, and metal oxides, the metal center of the strontium-based metal-organic framework prepared in this invention is coordinated with both carboxyl and hydroxyl groups, forming a metal-organic framework material with an ultra-high coordination number. Therefore, it has better adsorption selectivity, large adsorption capacity, and high chemical stability, and can exist stably in the water environment.

[0026] (3) This invention is the first to use strontium-based metal-organic framework materials for the separation of water and heavy water at room temperature. The small pore structure and flexible channels of the adsorbent allow the differences in the kinetic adsorption and diffusion of water isotopes with similar chemical properties to be infinitely amplified in the micropore channels. The separation factor can be increased by 24% at room temperature. Moreover, the strontium-based metal-organic framework material still maintains good stability after being soaked in water for a week. This adsorbent can separate water and heavy water simply and conveniently, avoiding the high energy consumption and cumbersome procedures of traditional distillation purification and electrolytic separation. It is expected to replace traditional separation technology. Attached Figure Description

[0027] Figure 1 The diagram shows the organic ligand structure of the strontium-based metal-organic framework material provided by this invention, where X represents H, OH, NO2, Cl, or Br.

[0028] Figure 2 The image shows the XRD pattern of the strontium-based metal-organic framework material in Example 1.

[0029] Figure 3 The image shows the FT-IR spectrum of the strontium-based metal-organic framework material in Example 1.

[0030] Figure 4 The coordination mode of the strontium-based metal-organic framework material in Example 1 is shown.

[0031] Figure 5 This is a SEM image of the strontium-based metal-organic framework material from Example 1.

[0032] Figure 6 The isotherms of water and heavy water adsorption of the strontium-based metal-organic framework material in Example 1 are shown at room temperature.

[0033] Figure 7 The adsorption ratio curves of water and heavy water for the strontium-based metal-organic framework material of Example 1 at room temperature are shown.

[0034] Figure 8 The image shows the XRD pattern of the strontium-based metal-organic framework material from Example 1 after immersion in water for one week. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention. Example 1

[0036] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0037] The preparation method includes the following steps:

[0038] A mixture of 0.1136 g (0.43 mol) SrCl2·6H2O and 0.1 g (0.22 mol) 4,4'-(anthracene-9,10-diyl)bis-2-hydroxybenzoic acid was dissolved in a mixed solution of 11 mL N,N-dimethylformamide (DMF), 10 mL deionized water, and 3 mL anhydrous ethanol. After sonication for 30 min at room temperature, a uniformly dispersed solution was obtained. The solution was transferred to a 50 mL reaction vessel liner and heated at 120 °C for 48 h. After natural cooling to room temperature, the resulting solution was centrifuged at 8000 r / min for 15 min to collect the solid. The solid was then collected by sonication with N,N-dimethylformamide and methanol in sequence. After drying at 60 °C for 4 h, the strontium-based metal-organic framework material was obtained.

[0039] Figure 2 and Figure 3 The XRD and FT-IR spectra of the strontium-based metal-organic framework material obtained in Example 1 are shown respectively, proving that the strontium-based metal-organic framework material was successfully synthesized. The XRD spectra show rearrangement of crystal diffraction peaks before and after activation, and exhibit a certain degree of reversibility, indicating that the structure has a certain degree of flexibility.

[0040] like Figure 4 As shown, the Sr atom coordinates with both the hydroxyl oxygen and carboxyl oxygen on 2,5-dihydroxyterephthalic acid. Each Sr atom forms an Sr-0 cluster with eight oxygen atoms, and there is also a free water molecule around the Sr atom. The coordination number is as high as 9, forming a strontium-based metal-organic framework material with one-dimensional channels, which has good chemical stability.

[0041] Figure 5 The image shows a SEM image of the strontium-based metal-organic framework material obtained in Example 1. The compound exhibits layered crystals with crystal sizes reaching the micrometer level. Figure 6 The adsorption isotherms of the strontium-based metal-organic framework material obtained in Example 1 for the adsorption of water and heavy water at room temperature show that the vapor adsorption capacities of water and heavy water can reach 8.39 and 6.51 mmol / g, respectively, at 25°C. Figure 7 The adsorption ratio curves of water and heavy water for the strontium-based metal-organic framework material obtained in Example 1 are shown. At 25°C and 0.7 bar, the adsorption ratio of H2O and D2O can reach 1.27. The adsorption amount of H2O is significantly higher than that of D2O, indicating that at room temperature, the strontium-based metal-organic framework material always preferentially adsorbs water molecules while achieving efficient enrichment of D2O. Figure 8 The XRD pattern of the strontium-based metal-organic framework material obtained in Example 1 after immersion in water for one week shows good crystallinity. Example 2

[0042] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used is SrCl2·6H2O, and the organic ligand is 2,5-dihydroxyterephthalic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0043] The preparation method includes the following steps:

[0044] A mixture of 1.307 g (4.52 mol) SrCl2·6H2O and 0.2892 g (1.46 mol) 2,5-dihydroxyterephthalic acid was dissolved in 180 mL of a mixed solution of N,N-dimethylformamide (DMF), deionized water, and anhydrous ethanol (v=1∶1∶1). The solution was sonicated at room temperature for 10 min to obtain a clear and transparent solution. The solution was transferred to the lining of a 250 mL reaction vessel and heated at 100 °C for 24 h. After naturally cooling to room temperature, the resulting solution was centrifuged at 8000 r / min for 10 min to collect the solid. The solid was then collected by sonication with N,N-dimethylformamide and methanol in sequence. After drying at 60 °C for 4 h, the strontium-based metal-organic framework material was obtained. Example 3

[0045] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used is Sr(NO3)2·4H2O, and the organic ligand is 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0046] The difference between this embodiment and Example 1 is that the type of soluble strontium-containing compound used is Sr(NO3)2·4H2O, while the rest are the same as in Example 1. Example 4

[0047] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used is Sr(OH)₂·8H₂O, and the organic ligand is 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0048] The difference between this embodiment and Example 1 is that the type of soluble strontium-containing compound used is Sr(OH)2·8H2O, while the rest are the same as in Example 1. Example 5

[0049] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was amino-modified 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0050] The difference between this embodiment and Example 1 is that the organic ligand is amino-modified 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid, while the rest is the same as in Example 1. Example 6

[0051] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was halogen-modified 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0052] The difference between this embodiment and Example 1 is that the organic ligand is halogen-modified 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid, while the rest is the same as in Example 1. Example 7

[0053] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0054] The difference between this embodiment and Example 1 is that the molar ratio of soluble strontium-containing compound to organic ligand in the hydrothermal synthesis is 4:1, while the rest is the same as in Example 1. Example 8

[0055] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0056] The difference between this embodiment and Example 1 is that the molar ratio of soluble strontium-containing compound to organic ligand in the hydrothermal synthesis is 1:4, while the rest is the same as in Example 1. Example 9

[0057] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0058] The difference between this embodiment and Embodiment 1 is that the hydrothermal synthesis reaction temperature is 150°C, while the rest is the same as Embodiment 1. Example 10

[0059] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0060] The difference between this embodiment and Example 1 is that the reaction temperature for hydrothermal synthesis is 80°C, while the rest is the same as in Example 1. Example 11

[0061] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 .

[0062] The difference between this embodiment and Embodiment 1 is that the hydrothermal time in the hydrothermal synthesis is 72 hours, while the rest is the same as in Embodiment 1. Example 12

[0063] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+The soluble strontium-containing compound used was SrCl2·6H2O, and the organic ligand was 4,4'-(anthracite-9,10-diyl)bis-2-hydroxybenzoic acid. The structure of the organic ligand is shown in [reference needed]. Figure 1 ;

[0064] The difference between this embodiment and Embodiment 1 is that the hydrothermal time in the hydrothermal synthesis is 24 hours, while the rest is the same as in Embodiment 1.

[0065] Comparative Example 1

[0066] This comparative example provides a strontium-based metal-organic framework material, which differs from Example 1 in that the organic ligand is 4,4'-(anthracite-9,10-diyl)bisbenzoic acid;

[0067] The preparation method includes the following steps:

[0068] A mixture of 0.1136 g (0.43 mol) SrCl2·6H2O and 0.093 g (0.22 mol) 4,4'-(anthracene-9,10-diyl)bisbenzoic acid was dissolved in a mixed solution of 11 mL N,N-dimethylformamide (DMF), 10 mL deionized water, and 3 mL anhydrous ethanol. After sonication for 30 min at room temperature, a uniformly dispersed solution was obtained. The solution was transferred to a 50 mL reaction vessel liner and heated at 120 °C for 48 h. After natural cooling to room temperature, the resulting solution was centrifuged at 8000 r / min for 15 min to collect the solid. The solid was then collected by sonication with N,N-dimethylformamide and methanol in sequence. After drying at 60 °C for 4 h, the strontium-based metal-organic framework material was obtained.

[0069] Comparative Example 2

[0070] This embodiment provides a strontium-based metal-organic framework material, wherein the metal cation is Sr. 2+ The soluble strontium-containing compound used is SrCl2·6H2O, and the organic ligand is terephthalic acid;

[0071] The preparation method includes the following steps:

[0072] A mixture of 1.307 g (4.52 mol) SrCl2·6H2O and 0.2892 g (1.46 mol) terephthalic acid was dissolved in 180 mL of a mixed solution of N,N-dimethylformamide (DMF), deionized water, and anhydrous ethanol (v=1∶1∶1). The solution was sonicated at room temperature for 10 min to obtain a clear and transparent solution. The solution was transferred to the lining of a 250 mL reaction vessel and heated at 100 °C for 24 h. After naturally cooling to room temperature, the resulting solution was centrifuged at 8000 r / min for 10 min to collect the solid. The solid was then collected by sonication with N,N-dimethylformamide and methanol in sequence. After drying at 60 °C for 4 h, the strontium-based metal-organic framework material was obtained.

[0073] The vapor adsorption capacity of the above examples and comparative examples was determined. The specific test methods and conditions are as follows:

[0074] The strontium-based metal-organic framework materials provided in the examples and comparative examples were activated by vacuum degassing at 120°C for 12 hours. The adsorption amounts of water and heavy water at 25°C and 1 bar were measured using a vapor adsorption analyzer. Furthermore, the adsorption ratio of water to heavy water by the strontium-based metal-organic framework materials at 25°C was calculated based on the adsorption amounts. The test results are shown in the table below.

[0075]

[0076] As can be seen from the table above:

[0077] (1) All strontium-based metal-organic framework materials prepared by the method described in this invention can adsorb water and heavy water at room temperature, and the adsorption capacity of water at room temperature is always greater than that of heavy water. This indicates that in a mixed solution of heavy water and water, the adsorbent always preferentially adsorbs water molecules. As can be seen from the comparison between Example 1 and Example 2, this invention prepares strontium-based metal-organic framework materials with different pore sizes by changing the type of hydroxyl and carboxyl organic ligands. A suitable pore size is more conducive to the efficient separation of water and heavy water by quantum sieving. Therefore, in Example 2, by reducing the length of the organic ligand, water and heavy water only form weak adsorption on the surface of the obtained strontium-based metal-organic framework material, resulting in a very low adsorption capacity of less than 1 mmol / g.

[0078] (2) Comparison of Examples 1 with Examples 3 and 4 shows that changing the type of strontium salt has little effect on the adsorption capacity of water and heavy water by the adsorbent, and the separation ratios are all between 1.1 and 1.2. Comparison of Examples 1 with Examples 5 and 6 shows that introducing hydrophilic functional groups into the organic ligand can improve the adsorption capacity of the adsorbent for water and heavy water at room temperature, and to a certain extent improve its water and heavy water separation performance. Comparison of Examples 1 with Examples 7 and 8 shows that the molar ratio of strontium source to organic ligand should have a fixed value in hydrothermal synthesis. When the strontium source content is too high, the excess metal ions will generate a large number of uncoordinated metal connection points, leading to a decrease in the stability of MOFs. When the organic ligand content is too high, it will lead to a decrease in yield and a decrease in stability, thereby affecting the adsorption performance of the adsorbent. A comparison of Examples 1 with Examples 9 and 10 shows that the reaction temperature for hydrothermal synthesis should be within a suitable range. When the reaction temperature is too high, carbonization of some organic ligands occurs, leading to a decrease in the purity of the strontium-based metal-organic framework material. When the reaction temperature is too low, the crystallization temperature of the strontium-based metal-organic framework is not reached, resulting in the generation of various byproducts, which in turn reduces the vapor adsorption performance of the strontium-based metal-organic framework material at room temperature. A comparison of Examples 1 with Examples 11 and 12 shows that a suitable hydrothermal reaction time can yield strontium-based metal-organic framework materials with good crystallinity and excellent adsorption performance.

[0079] (3) As can be seen from the comparison between Examples 1 and 2 and Comparative Examples 1 and 2, the strontium-based metal-organic framework obtained by using monocarboxylic acid organic ligands in the comparative examples showed good adsorption capacity for both water and heavy water. However, the adsorption ratio of water and heavy water at 25°C was only 1.03 and 1.05, respectively, which could not show good separation performance.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that these embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and alterations to the above embodiments within the scope of the present invention without departing from its principles and spirit. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. Use of a strontium-based metal-organic framework material for the adsorptive separation of water and heavy water at room temperature, the strontium-based metal-organic framework material being prepared by the following steps: S1. Dispersing a soluble strontium-containing compound and an organic ligand in a mixed solvent to obtain a uniform solution; the soluble strontium-containing compound is selected from one or more of SrCl2, SrBr2, Sr(NO3)2 and Sr(OH)2, the organic ligand is 2,5-dihydroxyterephthalic acid or 4,4'- (anthracene-9,10-diyl)bis-2-hydroxybenzoic acid, and the mixed solvent is a mixture of anhydrous ethanol, deionized water and N,N-dimethylformamide; S2. Subjecting the uniform solution to a hydrothermal reaction; S3. Centrifuging and filtering the product of the hydrothermal reaction of step S2, and drying to obtain the strontium-based metal-organic framework material.

2. Use according to claim 1, characterized in that, The soluble strontium-containing compound in step S1 is selected from one or more of SrCl2, Sr(NO3)2 and Sr(OH)2.

3. Use according to claim 1, characterized in that, The molar ratio of the soluble strontium-containing compound to the organic ligand in step S1 is (1-10):(1-10).

4. Use according to claim 1, characterized in that, The volume ratio of anhydrous ethanol, deionized water and N,N-dimethylformamide in the mixed solvent is (1-10):(1-10):(1-10).

5. Use according to claim 1, characterized in that, The dispersion method is microwave ultrasonic.

6. Use according to claim 5, characterized in that, The microwave ultrasonic time is 5-30 min.

7. Use according to claim 1, characterized in that, The temperature of the hydrothermal reaction in step S2 is 80-150°C, and the reaction time is 6-72 h.

8. Use according to claim 1, characterized in that, The centrifuging speed in step S3 is 4000-1000 r / min, and the time is 4-10 min.

9. Use according to claim 8, characterized in that, The solvent used for washing includes N,N-dimethylformamide and methanol.

10. Use according to claim 9, characterized in that, The washing is first performed using N,N-dimethylformamide, and then using methanol.

11. Use according to claim 1, characterized in that, The drying in step S3 is vacuum drying.

12. Use according to claim 11, characterized in that, The temperature of the vacuum drying is 40-100°C, and the time is 2-8 h.

Images