Fe-MOFs impregnated activated carbon composite adsorption material as well as preparation method and application thereof
By introducing Fe-MOFs and Fe3O4 into activated carbon to form a microporous structure, the problems of insufficient adsorption capacity and selectivity of traditional VOCs purification materials are solved, and efficient adsorption of VOCs is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZINGKE (CHONGQING) ADVANCED MATERIALS RES INST CO LTD
- Filing Date
- 2023-10-31
- Publication Date
- 2026-04-17
AI Technical Summary
Existing VOCs gas purification materials are not effective at adsorbing low-concentration pollutants, have weak selective adsorption capacity, and the desorption process can easily cause secondary pollution. Traditional inorganic zeolite materials and porous carbon materials have a low micropore ratio, the pores are easily blocked, they are highly hydrophilic, and the adsorption capacity is insufficient.
Fe-MOFs impregnated activated carbon composite adsorbent material is used. By introducing metal-organic framework materials Fe-MOFs and Fe3O4 into activated carbon, a large number of micropores are formed, which improves the selectivity and adsorption capacity of the adsorbent material and improves the pore structure.
It significantly improves the adsorption capacity and amount of VOCs, especially the adsorption effect on harmful gases such as SO2, benzene, and toluene, achieving highly efficient VOCs removal.
Smart Images
Figure CN121869301A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gas composite adsorption materials technology, and in particular to a Fe-MOFs impregnated activated carbon composite adsorption material, its preparation method and application. Background Technology
[0002] VOCs (volatile organic compounds) are characterized by their easy diffusion, toxicity, and volatility in the environment. They are key indicators for defining air pollution, causing serious damage to the atmospheric environment and consequently endangering human health. Studies have shown that they play a significant role in stratospheric ozone depletion, tropospheric ozone formation, ground-level smog formation, climate change, sick building syndrome, vegetation decay, atmospheric toxicity, and carcinogenicity in humans. During China's 14th Five-Year Plan period, VOCs control mainly focused on source control and industry self-regulation, implementing voluntary emission reductions. Therefore, developing highly efficient VOCs adsorption materials is particularly important for the economic regulation of industrial VOCs.
[0003] Currently, existing VOCs gas purification methods typically employ physical adsorption using materials such as activated carbon and natural zeolite. These materials have a large specific surface area and high thermal stability, and their adsorption mechanism is primarily physical adsorption, involving capillary condensation within the pore structure. However, unmodified activated carbon adsorbents have low VOCs adsorption capacity and are ineffective at adsorbing low concentrations of pollutants. Furthermore, they exhibit weak selective adsorption, few adsorption sites, and desorption processes, easily leading to secondary pollution. Traditional inorganic zeolite materials and porous carbon materials have a low proportion of micropores that play a crucial role in VOCs gas adsorption. Additionally, the pores of natural zeolite are prone to clogging, and its surface silica-oxygen structure has strong hydrophilicity. During adsorption, the presence of water molecules competes for surface active sites, consuming pore volume and reducing the adsorption capacity of target VOCs gas molecules.
[0004] Therefore, it is necessary to develop a gas adsorption material with strong adsorption capacity and large adsorption amount for VOCs. Summary of the Invention
[0005] In view of this, the purpose of this invention is to provide a Fe-MOFs impregnated activated carbon composite adsorbent material, its preparation method and application, which can improve the micropore ratio of traditional inorganic zeolite materials and porous carbon materials, and enhance the adsorption capacity and adsorption amount of VOCs gas.
[0006] The present invention solves the above-mentioned technical problems through the following technical means:
[0007] In a first aspect, the present invention provides an Fe-MOFs impregnated activated carbon composite adsorbent material, wherein the composite adsorbent material comprises a metal-organic framework material, activated carbon and Fe3O4, wherein the activated carbon accounts for 10-80% of the mass of the composite adsorbent material and the Fe3O4 accounts for 1-10% of the mass of the composite adsorbent material.
[0008] In conjunction with the first aspect, in some embodiments, the metal-organic framework material is MOF-199 or ZIF-8.
[0009] In conjunction with the first aspect, in some embodiments, the activated carbon is any one of wood-based activated carbon, coal-based activated carbon, coconut shell activated carbon, and biomass activated carbon.
[0010] The second aspect of this invention discloses a method for preparing the above-mentioned Fe-MOFs impregnated activated carbon composite adsorbent material, comprising the following steps:
[0011] The metal salt, ligand, and solvent are mixed and stirred to obtain a mixed solution;
[0012] Activated carbon and Fe3O4 were added to the mixed solution sequentially, and the mixture was stirred at 500-600 rpm for 3-5 hours. The mixture was then heated under reflux at 75-85℃ for 20-25 hours. The resulting reaction solution was cooled to room temperature, and the filtered solid was washed with ethanol and deionized water and dried to obtain Fe-MOFs impregnated activated carbon composite adsorbent material.
[0013] In conjunction with the second aspect, in some embodiments, the Fe-MOFs impregnated activated carbon composite adsorbent material is Fe-MOF-199@AC, the metal salt is any one of copper nitrate, copper acetate, and copper hydroxide, the ligand is trimesic acid, the solvent is ethanol, and the molar ratio of the metal salt to the ligand is 1.8:1.
[0014] In conjunction with the second aspect, in some embodiments, the Fe-MOFs impregnated activated carbon composite adsorbent material is Fe-ZIF-8@AC, the metal salt is any one of zinc nitrate, zinc acetate, and zinc chloride, the ligand is 2-methylimidazole, the solvent is ethanol, and the molar ratio of the metal salt to the ligand is 1:2.
[0015] In conjunction with the second aspect, in some embodiments, the preparation method of the Fe3O4 is as follows:
[0016] FeCl3·6H2O and CH3COONa were weighed and dissolved in (CH2OH)2, and reacted at 180-220℃ for 6-10 h. The reaction product was washed with methanol and deionized water and dried at 60-80℃ for 12-15 h to obtain Fe3O4.
[0017] In conjunction with the second aspect, in some embodiments, the molar ratio of FeCl3·6H2O to CH3COONa is 1:8.
[0018] Thirdly, the present invention improves the application of the above-mentioned Fe-MOFs impregnated activated carbon composite adsorbent material in VOCs gas adsorption.
[0019] In conjunction with the third aspect, in some embodiments, the VOCs gas is at least one of SO2, benzene, and toluene.
[0020] In the preparation method of the Fe-MOFs impregnated activated carbon composite adsorbent of the present invention, Fe-MOFs@AC adsorbent is synthesized in situ. The high selective adsorption of small molecule gases by MOF-199 and ZIF-8, and the high adsorption of thiophene-containing sulfur compounds and benzene compounds by Fe3O4 are utilized. The adsorption performance of the composite adsorbent for VOCs gases is improved by adjusting the mixing ratio of activated carbon (AC) and MOFs. This preparation method is simple, low-cost, and suitable for mass production.
[0021] The Fe-MOFs impregnated activated carbon composite adsorbent material of the present invention introduces mixed Fe-MOFs into a mesoporous AC framework, forming a large number of micropores between the two interfaces of Fe and MOFs and between MOFs and AC. By adjusting the pore structure and modifying the material surface, it is made to have abundant oxygen-containing functional groups, which effectively improves the adsorption performance of the adsorbent material for VOCs gas.
[0022] Tests showed that, under conditions of 298.2 K and 101.3 kPa, the mass adsorption ratio of AC for benzene was approximately 0.52% mg·g. -1 The mass adsorption ratio of toluene is approximately 0.46% mg·g. -1 The mass adsorption ratio of SO2 is approximately 0.63% mg·g. -1 The mass adsorption ratio of Fe-MOF-199@AC for benzene is approximately 2.17% mg·g. -1 The mass adsorption ratio of toluene is approximately 3.03% mg·g. -1 The mass adsorption ratio of SO2 is approximately 2.38% mg·g. -1 The mass adsorption ratio of Fe-ZIF-8@AC for benzene is approximately 2.24% mg·g. -1 The mass adsorption ratio of toluene is approximately 2.96% mg·g. -1 The mass adsorption ratio of SO2 is approximately 2.51% mg·g. -1 . Attached Figure Description
[0023] Figure 1XRD diffraction patterns of Fe-MOF-199@AC prepared for AC, MOF-199 and Example 1;
[0024] Figure 2 XRD diffraction patterns of Fe-ZIF-8@AC prepared for AC, ZIF-8 and Example 2;
[0025] Figure 3 The adsorption-desorption curves of nitrogen for AC, Fe-MOF-199@AC prepared in Example 1, and Fe-ZIF-8@AC prepared in Example 2 are shown.
[0026] Figure 4 Initial adsorption efficiency diagrams of toluene gas for AC, Fe-MOF-199@AC prepared in Example 1, and Fe-ZIF-8@AC prepared in Example 2. Detailed Implementation
[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0028] Unless otherwise specified in the following examples, the conditions are as per standard conditions or the manufacturer's recommendations. Raw materials, equipment, or instruments whose manufacturers are not specified are all commercially available products.
[0029] Traditional inorganic zeolite materials and porous carbon materials have a low proportion of micropores, which play a crucial role in VOCs adsorption. MOFs, however, have a moderate molecular size, allowing them to enter the large mesopores of activated carbon. They can fill the pores of activated carbon while maintaining high porosity, modifying mesopores into micropores, thus increasing the proportion of micropores and enhancing VOCs adsorption capacity. MOF-199 and ZIF-8 exhibit high selective adsorption for small molecule gases, and Fe3O4 also shows high adsorption for thiophene-containing sulfur compounds and benzene compounds. This invention provides an Fe-MOFs-impregnated activated carbon composite adsorbent material. It introduces the Fe-MOFs composite material into the mesoporous activated carbon (AC) framework, forming numerous micropores between the two interfaces of Fe-MOFs and AC. This increases the number of active sites, significantly improving the selective adsorption of VOCs by the impregnated carbon and enhancing the adsorption capacity of the MOFs-impregnated activated carbon.
[0030] The Fe-MOFs-impregnated activated carbon composite adsorbent of the present invention comprises a metal-organic framework material, activated carbon, and Fe3O4, wherein the activated carbon accounts for 10-80% of the mass of the composite adsorbent, and the Fe3O4 accounts for 1-10% of the mass of the composite adsorbent. The metal-organic framework material is MOF-199 or ZIF-8, and the activated carbon is any one of wood-based activated carbon, coal-based activated carbon, coconut shell activated carbon, and biomass activated carbon.
[0031] The preparation method of the Fe-MOFs impregnated activated carbon composite adsorbent of the present invention is as follows:
[0032] The metal salt, ligand, and solvent are mixed and stirred to obtain a mixed solution;
[0033] Activated carbon and Fe3O4 were added to the mixed solution sequentially, and the mixture was stirred at 500-600 rpm for 3-5 hours. The mixture was then heated under reflux at 75-85℃ for 20-25 hours. The resulting reaction solution was cooled to room temperature, and the filtered solid was washed with ethanol and deionized water and dried to obtain Fe-MOFs impregnated activated carbon composite adsorbent material.
[0034] Please refer to the following examples for details:
[0035] Example 1
[0036] In this embodiment, Fe-MOF-199 impregnated activated carbon adsorbent material (Fe-MOF-199@AC) was synthesized using an in-situ synthesis method.
[0037] (1) Synthesis of Fe3O4
[0038] 2g of FeCl3·6H2O and 5g of CH3COONa were dissolved in 60mL of (CH2OH)2, stirred until homogeneous, and reacted at 200℃ for 8 hours. The resulting reactant was washed five times with methanol and deionized water and dried at 60℃ for 12 hours to obtain Fe3O4. The Fe3O4 prepared in this way has a smaller average particle size, is easier to disperse in solution, and can achieve more uniform impregnation, resulting in better adsorption.
[0039] (2) Synthesis of Fe-MOF-199@AC
[0040] 8.75 g of Cu(NO3)2·3H2O (36.21 mmol) and 4.20 g of H3BTC (19.98 mmol) were dissolved in 150 mL of pure ethanol respectively. The two solutions were mixed and then 0.61 g (10 wt% theoretical complex) of coconut shell activated carbon was added, followed by 0.06 g of Fe3O4. The mixture was stirred at 550 rpm for 4 h. The resulting mixed solution was transferred to a round-bottom flask and heated under reflux at 80 °C for 24 h. After the reaction solution was cooled to room temperature, it was filtered to obtain Fe-MOF-199 impregnated activated carbon (i.e., Fe-MOF-199@AC). The carbon was washed twice with ethanol and deionized water respectively, and then dried at 80 °C for 12 h.
[0041] Example 2
[0042] This embodiment uses an in-situ synthesis method to synthesize Fe-ZIF-8 impregnated activated carbon adsorbent material (Fe-ZIF-8@AC):
[0043] (1) Synthesis of Fe3O4
[0044] 2g FeCl3·6H2O and 5g CH3COONa were dissolved in 60mL (CH2OH)2 and stirred until homogeneous. The mixture was then reacted at 200℃ for 8 hours. The resulting product was washed 5 times with methanol and deionized water and dried at 60℃ for 12 hours to obtain Fe3O4.
[0045] (2) Synthesis of Fe-ZIF-8@AC
[0046] 13.17 g (CH3COO)2Zn (60 mmol) was dissolved in 150 mL of pure ethanol, and 9.9 g 2-methylimidazole (120 mmol) and 5 g NaOH were dissolved in 150 mL of pure ethanol. The mixture was stirred vigorously for 3 h. Then, the two solutions were mixed and 0.61 g (10 wt% theoretical complex) of coconut shell activated carbon was added, followed by 0.06 g Fe3O4. The resulting mixed solution was stirred at 550 rpm for 8 h at room temperature, filtered and washed twice with ethanol and deionized water, and dried at 80 °C for 12 h to obtain the Fe-ZIF-8@AC adsorbent material.
[0047] Example 3
[0048] This embodiment is based on Example 1, except that the amount of activated carbon added is modified to 1.83g (30wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0049] Example 4
[0050] This embodiment is based on Example 1, except that the amount of activated carbon added is modified to 3.05g (50wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0051] Example 5
[0052] This embodiment is based on Example 1, except that the amount of activated carbon added is modified to 4.88g (80wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0053] Example 6
[0054] This embodiment is based on Example 2, except that the amount of activated carbon added is modified to 1.83g (30wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0055] Example 7
[0056] This embodiment is based on Example 2, except that the amount of activated carbon added is modified to 3.05g (50wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0057] Example 8
[0058] This embodiment is based on Example 2, except that the amount of activated carbon added is modified to 4.88g (80wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0059] Example 9
[0060] This embodiment is based on Example 1, except that the amount of Fe3O4 added is modified to 0.18g (3wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0061] Example 10
[0062] This embodiment is based on Example 1, except that the amount of Fe3O4 added is modified to 0.30g (5wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0063] Example 11
[0064] This embodiment is based on Example 1, except that the amount of Fe3O4 added is modified to 0.42g (7wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0065] Example 12
[0066] This embodiment is based on Example 1, except that the amount of Fe3O4 added is modified to 0.60g (10wt% Fe-MOFs impregnated activated carbon composite adsorbent material), while other conditions remain unchanged.
[0067] Example 13
[0068] In this embodiment, Fe-MOF-199 impregnated activated carbon adsorbent material (Fe-MOF-199@AC) was synthesized using an in-situ synthesis method.
[0069] (1) Synthesis of Fe3O4
[0070] 2g FeCl3·6H2O and 5g CH3COONa were dissolved in 60mL (CH2OH)2 and stirred until homogeneous. The mixture was then reacted at 180℃ for 10 hours. The resulting product was washed five times with methanol and deionized water and dried at 80℃ for 15 hours to obtain Fe3O4.
[0071] (2) Synthesis of Fe-MOF-199@AC
[0072] 8.75 g of Cu(NO3)2·3H2O (36.21 mmol) and 4.20 g of H3BTC (19.98 mmol) were dissolved in 150 mL of pure ethanol respectively. The two solutions were mixed and then 0.61 g (10 wt% theoretical complex) of wood-based activated carbon was added, followed by 0.06 g of Fe3O4. The mixture was stirred at 500 rpm for 5 h. The resulting mixed solution was transferred to a round-bottom flask and heated under reflux at 75 °C for 25 h. After the reaction solution was cooled to room temperature, it was filtered to obtain Fe-MOF-199 impregnated activated carbon (i.e., Fe-MOF-199@AC). The carbon was washed twice with ethanol and deionized water respectively, and then dried at 80 °C for 12 h.
[0073] Example 14
[0074] In this embodiment, Fe-MOF-199 impregnated activated carbon adsorbent material (Fe-MOF-199@AC) was synthesized using an in-situ synthesis method.
[0075] (1) Synthesis of Fe3O4
[0076] 2g FeCl3·6H2O and 5g CH3COONa were dissolved in 60mL (CH2OH)2 and stirred until homogeneous. The mixture was then reacted at 220℃ for 6 hours. The resulting product was washed 5 times with methanol and deionized water and dried at 70℃ for 13 hours to obtain Fe3O4.
[0077] (2) Synthesis of Fe-MOF-199@AC
[0078] 8.75 g of Cu(NO3)2·3H2O (36.21 mmol) and 4.20 g of H3BTC (19.98 mmol) were dissolved in 150 mL of pure ethanol respectively. The two solutions were mixed and then 0.61 g (10 wt% theoretical complex) of wood-based activated carbon was added, followed by 0.06 g of Fe3O4. The mixture was stirred at 600 rpm for 3 h. The resulting mixed solution was transferred to a round-bottom flask and heated under reflux at 85 °C for 20 h. After the reaction solution was cooled to room temperature, it was filtered to obtain Fe-MOF-199 impregnated activated carbon (i.e., Fe-MOF-199@AC). The carbon was washed twice with ethanol and deionized water respectively, and then dried at 80 °C for 12 h.
[0079] The performance of the Fe-MOFs impregnated activated carbon composite adsorbent materials prepared in Examples 1 and 2 was tested as follows:
[0080] (1) X-ray diffraction (XRD characterization): The sample was scanned using an X-ray diffractometer between 2θ = 5 and 50 °C. The test results are as follows: Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The data show that the XRD of pure AC has no characteristic peaks, but after introducing Fe-MOF-199 onto AC, typical characteristic three strong peaks appear at 6.7°, 9.5°, and 11.6°, corresponding to crystal planes (200), (220), and (222), respectively, indicating that a structurally stable MOF-199 structure is formed on AC. After introducing Fe-ZIF-8 onto AC, typical characteristic three strong peaks appear at 7.4°, 10.4°, and 12.8°, corresponding to crystal planes (011), (002), and (112), respectively, indicating that a structurally stable Fe-ZIF-8 structure is formed on AC.
[0081] (2) Specific surface area test. Under 77K conditions, N2 adsorption-desorption experiments were conducted on the composite adsorbent materials prepared in Examples 1 and 2, as well as pure activated carbon, using a physical adsorption apparatus. The adsorption-desorption curves of nitrogen for AC, Fe-MOF-199@AC, and Fe-ZIF-8@AC are shown below. Figure 3 As shown, the specific surface area (BET) of AC, Fe-MOF-199@AC, and Fe-ZIF-8@AC was calculated based on the nitrogen adsorption-desorption curves, and the results were 1215.77 m², respectively. 2 / g, 1565.61m 2 / g, 1629.47m 2 / g.
[0082] (3) Gas Adsorption Test. The adsorption equilibrium isotherms of the composite adsorbents prepared in Examples 1 and 2, as well as pure activated carbon, were measured at room temperature using a static adsorption apparatus for the adsorption of SO2, benzene, toluene, and other toxic and harmful gases using powdered activated carbon and Fe-MOF-199@AC and Fe-ZIF-8@AC adsorbents. Before adsorption measurement, the adsorbent was evacuated at 423.2 K until no mass loss was observed. Then, a certain amount of adsorbent (approximately 10 g) was carefully loaded into the adsorption cell to reduce binder wear and ensure accurate measurement of free volume. Additionally, the airflow rate of the adsorption apparatus was 15 m³ / s. 3 The test gas concentration was 9 ppm per hour. The test results are shown in Table 1.
[0083] Table 1
[0084]
[0085] Figure 4 The initial adsorption efficiency diagrams of toluene gas for AC, Fe-MOF-199@AC prepared in Example 1, and Fe-ZIF-8@AC prepared in Example 2 are shown. Figure 4 The data shows that, under the same initial conditions, the adsorption effect on toluene gas is better after introducing a mixture of Fe-MOF-199 or Fe-ZIF-8 into activated carbon AC. Therefore, the Fe-MOFs impregnated activated carbon composite adsorbent material of the present invention can be applied to the adsorption of VOCs gas, wherein the VOCs gas is at least one of SO2, benzene, and toluene.
[0086] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.
Claims
1. A Fe-MOFs impregnated activated carbon composite adsorbent material, characterized in that, The composite adsorbent material includes a metal-organic framework, activated carbon, and Fe3O4, wherein the activated carbon accounts for 10-80% of the mass of the composite adsorbent material, and the Fe3O4 accounts for 1-10% of the mass of the composite adsorbent material.
2. The Fe-MOFs impregnated activated carbon composite adsorbent material according to claim 1, characterized in that, The metal-organic framework material is MOF-199 or ZIF-8.
3. The Fe-MOFs impregnated activated carbon composite adsorbent material according to claim 1, characterized in that, The activated carbon is any one of wood-based activated carbon, coal-based activated carbon, coconut shell activated carbon, and biomass activated carbon.
4. The method for preparing the Fe-MOFs impregnated activated carbon composite adsorbent material according to any one of claims 1-3, characterized in that, Includes the following steps: The metal salt, ligand, and solvent are mixed and stirred to obtain a mixed solution; Activated carbon and Fe3O4 were added to the mixed solution sequentially, and the mixture was stirred at 500-600 rpm for 3-5 hours. The mixture was then heated under reflux at 75-85℃ for 20-25 hours. The resulting reaction solution was cooled to room temperature, and the filtered solid was washed with ethanol and deionized water and dried to obtain Fe-MOFs impregnated activated carbon composite adsorbent material.
5. The preparation method according to claim 4, characterized in that, The Fe-MOFs impregnated activated carbon composite adsorbent material is Fe-MOF-199@AC, the metal salt is any one of copper nitrate, copper acetate and copper hydroxide, the ligand is trimesic acid, the solvent is ethanol, and the molar ratio of the metal salt to the ligand is 1.8:
1.
6. The preparation method according to claim 4, characterized in that, The Fe-MOFs impregnated activated carbon composite adsorbent material is Fe-ZIF-8@AC, the metal salt is any one of zinc nitrate, zinc acetate, and zinc chloride, the ligand is 2-methylimidazole, the solvent is ethanol, and the molar ratio of the metal salt to the ligand is 1:
2.
7. The preparation method according to claim 4, characterized in that, The preparation method of Fe3O4 is as follows: FeCl3·6H2O and CH3COONa were weighed and dissolved in (CH2OH)2, and reacted at 180-220℃ for 6-10 h. The reaction product was washed with methanol and deionized water and dried at 60-80℃ for 12-15 h to obtain Fe3O4.
8. The preparation method according to claim 7, characterized in that, The molar ratio of FeCl3·6H2O to CH3COONa is 1:
8.
9. The application of the Fe-MOFs impregnated activated carbon composite adsorbent material according to any one of claims 1-3 in VOCs gas adsorption.
10. The application according to claim 9, characterized in that, The VOCs gas is at least one of SO2, benzene, and toluene.