A magnetic metal organic framework adsorbent material, a preparation method and application thereof

Abstract

The application discloses a kind of magnetic metal organic framework adsorption materials and preparation method and application thereof, including preparation magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH and preparation magnetic metal organic framework adsorption material Fe3O4@CuZnAl-LDH@MIL-100 (Fe). The present application takes Fe3O4 as core, two kinds of nanometer materials of double-layer hydroxide and metal organic skeleton are loaded on its surface, and the magnetic nanometer material with metal organic skeleton as shell structure is prepared, which greatly increases the specific surface area and action site of the composite material;The present application avoids using a large number of toxic organic solvents (such as acetone, chloroform, etc.) in the whole synthesis process, is more green and environmental protection, reduces the harm to human body and environment;The preparation of the material of the present application is convenient, low in cost, and the material has good repeatability, can be used repeatedly, is conducive to large-scale production and application;The material of the present application has quick and good adsorption capacity for triazole fungicide in water, reaches adsorption saturation in 10 minutes, and the whole adsorption removal process is rapid and efficient.

Description

Technical Field

[0001] This invention relates to the field of adsorption and separation materials for water pollutants, and in particular to a magnetic metal-organic framework adsorption material, its preparation method, and its application. Background Technology

[0002] Triazole fungicides are a class of pesticides with strong pest control capabilities in farmland. However, their widespread use inevitably leads to significant pesticide residues in the environment, posing ecological safety concerns. Therefore, a suitable and sensitive adsorption and separation method is crucial for removing pesticide pollutants from the environment. Currently, magnetic solid-phase extraction (MSE) is attracting increasing attention due to its speed and high extraction efficiency. The design of high-extraction-capacity magnetic nanomaterials is central to MSE.

[0003] Among numerous nanomaterials, metal-organic frameworks (MOFs) have attracted widespread attention due to their high stability, large surface area, and excellent adsorption capacity for compounds. Furthermore, layered hydroxides (LDHs), with their high anion substitution capacity and large specific surface area, are also used in adsorption. However, LDHs are mostly used for the adsorption of dyes and metal ions (Zaghouane-Boudiaf H et al, Removal of methyl orange from aqueous solution by uncalcined and calcined MgNiAl layered double hydroxides (LDHs), 2012; Zhang X et al, Removal of uranium (VI) from aqueous solutions by magnetic Mg-Al layered double hydroxide intercalated with citrate: kinetic and thermodynamic investigation, 2012), with limited research on their application in the adsorption of organic pollutants. Considering that composite nanomaterials can not only improve the performance of individual nanomaterials but also benefit practical applications in various fields, the design and exploration of LDHs / MOF hybrid materials represent a promising application prospect for magnetic solid-phase extraction.

[0004] MIL-100(Fe) is a green, low-cost, and water-stable MOF material. However, its application in the adsorption and separation of triazole fungicides has not yet been studied.

[0005] Therefore, combining the magnetic core with the bilayer hydroxide material CuZnAl-LDH and the metal-organic framework material MIL-100(Fe) results in a composite material that possesses both the rapid separation properties of magnetic materials and the advantages of high specific surface area and high porosity of bilayer hydroxide and metal-organic framework materials, making it a promising candidate for the adsorption and removal of pollutants in aquatic environments. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a magnetic metal-organic framework adsorbent material, its preparation method, and its application.

[0007] To achieve the above objectives, the present invention is implemented according to the following technical solution:

[0008] The first objective of this invention is to provide a method for preparing a magnetic metal-organic framework adsorbent material, comprising the following steps:

[0009] S1. Preparation of magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH:

[0010] S11. Disperse 0.4g of Fe3O4 microspheres ultrasonically into 50mL of a methanol-water mixture with a volume ratio of 1:1 for 10min to obtain a mixture;

[0011] S12. Dissolve Cu(NO3)2·3H2O, Zn(NO3)2·6H2O and Al(NO3)3·9H2O in water with a molar ratio of (1-2):(1-2):1 to obtain 50 mL of mixed salt solution;

[0012] S13. The mixed salt solution was added dropwise to the above mixture, and 50 mL of alkaline solution with pH 9-11 was added at the same time. After stirring at room temperature for 1 h, the product was washed with deionized water and ethanol, and dried under vacuum at 70 °C to obtain magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH.

[0013] S2. Preparation of magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe):

[0014] S21. 0.2g of magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH was dispersed in 30mL of ethanol solution containing 0.24g FeCl3·6H2O, heated at 70-140℃ for 15min, and the resulting material was washed with ethanol to obtain material A.

[0015] S22. Add material A to 30 mL of ethanol solution containing 0.25 g of 1,3,5-benzenetricarboxylic acid, heat at 70-140 °C for 15 min, separate the obtained material by magnetic adsorption, collect the magnetic material and wash it with ethanol to obtain material B.

[0016] S23. Disperse the above material B into 30 mL of an ethanol solution containing 0.49 g FeCl3·6H2O and 0.50 g 1,3,5-benzenetricarboxylic acid, heat at 70-140 °C for 6 h, separate the obtained material by magnetic adsorption, collect the magnetic material and wash it several times with ethanol, and dry it under vacuum at 70 °C to obtain the magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0017] Preferably, in step S12, the molar ratio of Cu(NO3)2·3H2O, Zn(NO3)2·6H2O, and Al(NO3)3·9H2O is 1:1:1.

[0018] Furthermore, in step S13, the alkaline solution is a mixed alkaline solution of NaOH and Na2CO3.

[0019] Preferably, the heating temperature in step S21 is 120°C.

[0020] Preferably, the heating temperature in step S22 is 120°C.

[0021] Preferably, the heating temperature in step S23 is 120°C.

[0022] The second objective of this invention is to provide a magnetic metal-organic framework adsorbent material prepared using the above method.

[0023] The third objective of this invention is to provide an application of magnetic metal-organic framework adsorbents in the adsorption and separation of triazole bactericides.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) This invention uses Fe3O4 as the core and loads two nanomaterials, bilayer hydroxide and metal-organic framework, onto its surface to prepare magnetic nanomaterials with metal-organic framework as the shell structure, which greatly increases the specific surface area and active sites of the composite material.

[0026] (2) The entire synthesis process of this invention avoids the use of large amounts of toxic organic solvents (such as acetone, chloroform, etc.), making it more green and environmentally friendly, and reducing harm to the human body and the environment;

[0027] (3) The preparation of the material of the present invention is convenient, low in cost, and has good repeatability. It can be recycled multiple times, which is conducive to large-scale production and application.

[0028] (4) The material of the present invention has a rapid and good adsorption capacity for triazole bactericides in water, and reaches adsorption saturation in 10 minutes. The entire adsorption and removal process is fast and efficient. Attached Figure Description

[0029] Figure 1 The effect of Cu / Zn / Al molar ratio on the adsorption capacity of Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0030] Figure 2 The effect of reaction temperature on the adsorption capacity of Fe3O4@CuZnAl-LDH@MIL-100(Fe) was investigated.

[0031] Figure 3 SEM characterization images of Fe3O4(A), Fe3O4@CuZnAl-LDH(B), and Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0032] Figure 4 FT-IR characterizations of Fe3O4, Fe3O4@CuZnAl-LDH and Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0033] Figure 5 Hysteresis curves of Fe3O4, Fe3O4@CuZnAl-LDH and Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0034] Figure 6 The BET plots are for Fe3O4, Fe3O4@CuZnAl-LDH and Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0035] Figure 7 Pore ​​size distribution diagrams for Fe3O4, Fe3O4@CuZnAl-LDH and Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0036] Figure 8 Thermogravimetric analysis (TGA) diagrams for Fe3O4, Fe3O4@CuZnAl-LDH, and Fe3O4@CuZnAl-LDH@MIL-100(Fe) are shown.

[0037] Figure 9 Static adsorption isotherms of three triazole fungicides, paclobutrazol, uniconazole, and furazolidone, on the adsorption material are shown.

[0038] Figure 10 The images show the dynamic adsorption curves of three triazole fungicides—paclobutrazol, uniconazole, and furazolidone—on the adsorption material.

[0039] Figure 11The reusability of Fe3O4@CuZnAl-LDH@MIL-100(Fe) adsorbent material after 8 adsorption-desorption cycles. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0041] Example 1

[0042] S1. Preparation of magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH:

[0043] S11. Disperse 0.4g of Fe3O4 microspheres ultrasonically into 50mL of a methanol-water mixture with a volume ratio of 1:1 for 10min to obtain a mixture;

[0044] S12. Dissolve 0.36g Cu(NO3)2·3H2O, 0.45g Zn(NO3)2·6H2O, and 0.56g Al(NO3)3·9H2O in water to obtain 50mL of mixed salt solution;

[0045] S13. The mixed salt solution was added dropwise to the above mixture, and 50 mL of an alkaline solution with pH 10 (containing 3 g NaOH and 2.65 g Na2CO3) was added at the same time. After stirring at room temperature for 1 h, the product was washed with deionized water and ethanol and dried under vacuum at 70 °C to obtain magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH.

[0046] S2. Preparation of magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe):

[0047] S21. 0.2g of magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH was dispersed in 30mL of ethanol solution containing 0.24g FeCl3·6H2O, heated at 120℃ for 15min, and the resulting material was washed with ethanol to obtain material A.

[0048] S22. Add material A to 30 mL of ethanol solution containing 0.25 g of 1,3,5-benzenetricarboxylic acid, heat at 120 °C for 15 min, separate the obtained material by magnetic adsorption, collect the magnetic material and wash it with ethanol to obtain material B.

[0049] S23. Disperse the above material B into 30 mL of an ethanol solution containing 0.49 g FeCl3·6H2O and 0.50 g 1,3,5-benzenetricarboxylic acid, heat at 120 °C for 6 h, separate the obtained material by magnetic adsorption, collect the magnetic material and wash it several times with ethanol, and dry it under vacuum at 70 °C to obtain the magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0050] Example 2

[0051] The difference from Example 1 is that the molar ratio of Cu(NO3)2·3H2O, Zn(NO3)2·6H2O, and Al(NO3)3·9H2O in step S12 is 2:1:1.

[0052] Example 3

[0053] The difference from Example 1 is that the molar ratio of Cu(NO3)2·3H2O, Zn(NO3)2·6H2O, and Al(NO3)3·9H2O in step S12 is 1:2:1.

[0054] Example 4

[0055] The difference from Example 1 is that the molar ratio of Cu(NO3)2·3H2O, Zn(NO3)2·6H2O, and Al(NO3)3·9H2O in step S12 is 2:2:1.

[0056] Example 5

[0057] The difference from Example 1 is that the heating temperature in steps S21, S22, and S23 is 70°C.

[0058] Example 6

[0059] The difference from Example 1 is that the heating temperature in steps S21, S22, and S23 is 100°C.

[0060] Example 7

[0061] The difference from Example 1 is that the heating temperature in steps S21, S22, and S23 is 140°C.

[0062] To investigate the adsorption performance of Fe3O4@CuZnAl-LDH@MIL-100(Fe) on three triazole fungicides—paclobutrazol, uniconazole, and bromuconazole—static and dynamic adsorption experiments were conducted.

[0063] Static adsorption experiment: 200 mg of Fe3O4@CuZnAl-LDH@MIL-100 (Fe) adsorbent was dispersed in 100 mL of a series of different concentrations (10-300 mg / L). -1 Adsorption isotherm experiments were conducted on a mixed aqueous solution of triazole fungicides. The mixed solution was shaken in a shaker (25℃, 200rpm) for 30 minutes, and then the adsorbent and solution phases were separated by magnetic separation and filtration through a 0.22μm filter membrane. The residual concentration of triazole fungicides in the supernatant was then analyzed by HPLC-UV. Each experiment was performed three times, and the average value was taken. The adsorption amount was calculated by the following equation (1):

[0064]

[0065] Q e It is the adsorption capacity of the adsorbent (mg / g) -1 ), C0 and C e These are the initial and equilibrium concentrations of the analyte in the solution, respectively. V is the volume of the solution (100 mL), and m is the amount of adsorbent (200 mg).

[0066] Dynamic adsorption experiment: 1g of Fe3O4@CuZnAl-LDH@MIL-100(Fe) adsorbent was dispersed in 500mL of a mixed aqueous solution of triazole fungicide (initial concentration of each analyte was 80mg / L). -1 The mixed solution was shaken in a shaker (25℃, 200rpm) for different times. At each time point, 200μL of solution was drawn with a syringe, filtered through a 0.22μm filter membrane, and injected for analysis. The residual concentration of triazole fungicide in the supernatant was calculated by HPLC-UV. Each experiment was performed three times, and the average value was taken. The adsorption amount was calculated by equation (1).

[0067] The effects of Fe3O4@CuZnAl-LDH@MIL-100(Fe) prepared in Examples 1-4 on the adsorption capacity of three pesticides are as follows: Figure 1 As shown. By Figure 1 It was found that the adsorption capacity of the three pesticides was the highest when the molar ratio of Cu / Zn / Al was 1:1:1. Therefore, a Cu / Zn / Al molar ratio of 1:1:1 was used for further research.

[0068] The effect of Fe3O4@CuZnAl-LDH@MIL-100 (Fe) adsorption performance prepared in Examples 1, 5-7 is as follows: Figure 2 As shown. By Figure 2It can be seen that as the reaction temperature increases from 70℃ to 120℃, the adsorption of the three pesticides by Fe3O4@CuZnAl-LDH@MIL-100(Fe) increases. However, with further increases in temperature, the adsorption performance of Fe3O4@CuZnAl-LDH@MIL-100(Fe) does not significantly improve. Therefore, the reaction temperature for MIL-100(Fe) was chosen to be 120℃. Thus, Example 1 is the optimal implementation method for subsequent implementation.

[0069] Characterization of the magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe) prepared in Example 1:

[0070] First, the morphology and structure of Fe3O4, Fe3O4@CuZnAl-LDH, and Fe3O4@CuZnAl-LDH@MIL-100(Fe) in Example 1 were characterized using SEM. Figure 3 As shown in Figure A, the Fe3O4 nanoparticles exhibit good sphericity, with an average diameter of 300-500 nm. After the CuZnAl-LDH coating, the Fe3O4 surface displays many nanosheet structures. Figure 3 B). From Figure 3 As can be seen from C, the surface of Fe3O4@CuZnAl-LDH@MIL-100(Fe) is rougher than that of Fe3O4@CuZnAl-LDH, indicating that MIL-100(Fe) was successfully modified on the surface of Fe3O4@CuZnAl-LDH.

[0071] Then, the surface group structures of Fe3O4, Fe3O4@CuZnAl-LDH and Fe3O4@CuZnAl-LDH@MIL-100(Fe) were characterized by FT-IR (see [link to FT-IR]). Figure 4 The results show the successful synthesis of Fe3O4@CuZnAl-LDH@MIL-100(Fe).

[0072] The hysteresis curves of Fe3O4, Fe3O4@CuZnAl-LDH, and Fe3O4@CuZnAl-LDH@MIL-100(Fe) were measured at room temperature (25℃) using a vibrating sample magnetometer. Figure 5 As shown, Fe3O4@CuZnAl-LDH@MIL-100(Fe) exhibits superparamagnetism. The saturation magnetization of Fe3O4, Fe3O4@CuZnAl-LDH, and Fe3O4@CuZnAl-LDH@MIL-100(Fe) is 78.2 emu g. -1 38.8 emu g -1 and 29.0 emu g -1Due to surface modification, Fe3O4@CuZnAl-LDH@MIL-100(Fe) has a low saturation magnetization, but it is sufficient for magnetic separation.

[0073] To further confirm the structure of the material, N2 adsorption-desorption experiments were conducted (see [link to experiment]). Figure 6 and 7 The BET specific surface areas of Fe3O4, Fe3O4@CuZnAl-LDH, and Fe3O4@CuZnAl-LDH@MIL-100(Fe) are 6.9, 78.4, and 486.0 m², respectively. 2 g -1 The results show that the introduction of the CuZnAl-LDH layer and the MIL-100(Fe) layer helps to increase the specific surface area of ​​Fe3O4. The hysteresis loop shape indicates the presence of micropores and mesopores in Fe3O4@CuZnAl-LDH@MIL-100(Fe) (see [link to study]). Figure 6 Barrett-Joyner-Halenda (BJH) aperture distribution curve (see...) Figure 7 The results show that the pore size of Fe3O4@CuZnAl-LDH@MIL-100(Fe) is mainly distributed in the range of 1.7-10 nm, with an average pore size of 4.8 nm. These results indicate the successful synthesis of Fe3O4@CuZnAl-LDH@MIL-100(Fe). The high specific surface area and pore volume of Fe3O4@CuZnAl-LDH@MIL-100(Fe) provide more active sites, thereby improving its adsorption capacity and extraction performance.

[0074] In air, at a temperature range of 20-800℃, the heating rate is 10℃ / min. -1 Under the specified conditions, the thermal stability of Fe3O4, Fe3O4@CuZnAl-LDH, and Fe3O4@CuZnAl-LDH@MIL-100(Fe) was characterized using thermogravimetric analysis. The results are as follows: Figure 8 As shown. From Figure 8It can be seen that the mass of Fe3O4 remains essentially constant with increasing temperature. For Fe3O4@CuZnAl-LDH, in the first heating step (20-150℃), 9.0% of the weight loss is attributed to the evaporation of low molecular weight solvents (such as H2O) on the material surface. Between 150-300℃, a 7.4% weight loss occurs due to dehydrogenation and partial decomposition of LDH into oxides. In the 300-800℃ range, a 4.5% weight loss may be related to the decomposition of carbonates in the LDH structure. The TGA curves of Fe3O4@CuZnAl-LDH@MIL-100(Fe) at 20-300℃ are similar to those of Fe3O4@CuZnAl-LDH. At 300-500℃, the mass of Fe3O4@CuZnAl-LDH@MIL-100(Fe) decreases sharply due to the decomposition of MIL-100(Fe). These results further demonstrate that MIL-100(Fe) was successfully coated on the Fe3O4@CuZnAl-LDH surface.

[0075] The magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe) prepared in Example 1 was used to adsorb paclobutrazol, uniconazole, and furazolidone. The static adsorption isotherms of paclobutrazol, uniconazole, and furazolidone on the adsorbent material are shown below. Figure 9 As shown, at lower initial concentrations, the adsorption capacity of the three triazole fungicides increases sharply with increasing initial concentration due to the sufficient adsorption sites on the Fe3O4@CuZnAl-LDH@MIL-100(Fe) adsorbent material. When the initial concentration increases to a certain range, the active sites on Fe3O4@CuZnAl-LDH@MIL-100(Fe) gradually become saturated, thus slowing down the adsorption rate.

[0076] The magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe) prepared in Example 1 was used to adsorb paclobutrazol, uniconazole, and furazolidone. The dynamic adsorption curves of paclobutrazol, uniconazole, and furazolidone on the adsorbent are shown below. Figure 10 As shown, the three triazole fungicides reached adsorption equilibrium after 10 minutes of adsorption. The adsorption efficiency of Fe3O4@CuZnAl-LDH@MIL-100(Fe) adsorbent material at 80 mg / L was calculated. -1 The equilibrium adsorption capacities of paclobutrazol, uniconazole, and furazolidone were 37.93 mg / g, respectively. -1 39.27mg g -1 and 42.40 mg g -1 .

[0077] Study on the reusability of the magnetic metal-organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe) prepared in Example 1:

[0078] First, 10 mg of Fe3O4@CuZnAl-LDH@MIL-100(Fe) adsorbent was added to 5 mL of a water sample containing three triazole fungicides (spiked concentration 1 mg / L). -1 Add 24% (w / v) sodium chloride to the water sample to adjust the ionic strength, and sonicate at 25°C for 5 min. Then, collect the adsorbent with a magnet and wash with 2 mL of ultrapure water. Subsequently, add 2.3 mL of acetone solution containing 10% (v / v) ammonia, sonicate for 2 min, and collect the adsorbent with a magnet, thus completing one sample extraction. Next, sonicate the adsorbent in 2.3 mL of acetone solution containing 10% (v / v) ammonia for 10 min, and then wash twice with 2 mL of acetone to regenerate the adsorbent. The adsorbent obtained after magnetic separation is dried under a nitrogen flow at 30°C for reuse. Figure 11 It can be seen that after 8 cycles, the extraction rates of the three triazole bactericides were all greater than 85%, indicating that the Fe3O4@CuZnAl-LDH@MIL-100(Fe) adsorbent material has good regeneration performance and great potential in actual water sample treatment.

[0079] The technical solutions of the present invention are not limited to the specific embodiments described above. Any technical modifications made in accordance with the technical solutions of the present invention fall within the protection scope of the present invention.

Claims

1. A method of preparing a magnetic metal-organic framework adsorbent material, characterized by, The method comprises the following steps: S1, preparing magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH: S11, dispersing 0.4 g of Fe3O4 microspheres in 50 mL of a mixed solution of methanol and water with a volume ratio of 1:1 for 10 min to obtain a mixture; S12, dissolving Cu(NO3)2·3H2O, Zn(NO3)2·6H2O and Al(NO3)3·9H2O with a molar ratio of (1-2):(1-2):1 in water to obtain a 50 mL mixed salt solution; S13, adding the mixed salt solution dropwise into the above mixture, and adding 50 mL of an alkaline solution with a pH of 9-11 at the same time, stirring at room temperature for 1 h, and then washing the product with deionized water and ethanol, and vacuum drying at 70°C to obtain the magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH; S2, preparing magnetic metal organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe): S21, dispersing 0.2 g of magnetic double-layer hydroxide Fe3O4@CuZnAl-LDH in 30 mL of an ethanol solution containing 0.24 g of FeCl3·6H2O, and heating at 70-140°C for 15 min, and then washing the obtained material with ethanol to obtain material A; S22, adding material A into 30 mL of an ethanol solution containing 0.25 g of 1,3,5-benzenetricarboxylic acid, and heating at 70-140°C for 15 min, and then collecting the magnetic material by magnetic adsorption and washing the material with ethanol to obtain material B; S23, dispersing the above material B into 30 mL of an ethanol solution containing 0.49 g of FeCl3·6H2O and 0.50 g of 1,3,5-benzenetricarboxylic acid, and heating at 70-140°C for 6 h, and then collecting the magnetic material by magnetic adsorption and washing the material with ethanol for several times, and vacuum drying at 70°C to obtain the magnetic metal organic framework adsorbent Fe3O4@CuZnAl-LDH@MIL-100(Fe).

2. The method for preparing the magnetic metal-organic framework adsorbent material according to claim 1, characterized in that, In the step S12, the molar ratio of Cu(NO3)2·3H2O, Zn(NO3)2·6H2O and Al(NO3)3·9H2O is 1:1:

1.

3. The method for preparing the magnetic metal-organic framework adsorbent material according to claim 1, characterized in that, In the step S13, the alkaline solution is a mixed alkaline solution of NaOH and Na2CO3.

4. The method for preparing the magnetic metal-organic framework adsorbent material according to claim 1, characterized in that, The heating temperature in the step S21 is 120°C.

5. The method for preparing the magnetic metal-organic framework adsorbent material according to claim 1, characterized in that, The heating temperature in the step S22 is 120°C.

6. The method for preparing the magnetic metal-organic framework adsorbent material according to claim 1, characterized in that, The heating temperature in the step S23 is 120°C.

7. A magnetic metal organic framework adsorbent prepared by the method according to any one of claims 1-6.

8. Application of the magnetic metal organic framework adsorbent according to claim 7 in adsorption and separation of triazole fungicides.

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