Ultramicroporous carbon material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of air pollution control, in particular to an ultra-microporous carbon material as well as a preparation method and application thereof. The preparation method comprises the following steps: contacting a porous carbon material with a phenolic compound, and carrying out thermal cracking treatment to obtain the ultra-microporous carbon material. According to the preparation method, the phenolic compound is adsorbed onto the porous carbon material, and then is heated and cracked, so that carbon atoms are deposited on the surface of a pore channel of the porous carbon material, the micropore diameter of the porous carbon material is reduced, the ultramicropore volume is increased, and the adsorption acting force on small-molecule volatile organic compounds such as dichloromethane is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of air pollution control, and particularly relates to a super-microporous carbon material, a preparation method thereof, and an application thereof. Background Art

[0002] Volatile organic compounds (VOCs) can participate in atmospheric photochemical reactions and are important precursors for the formation of tropospheric ozone and particulate pollutants in the atmosphere. Among them, chlorinated VOCs have higher biological toxicity and chemical stability, are more difficult to degrade, are prone to generate secondary pollutants, and have a more significant negative impact on the environment and human health.

[0003] At present, activated carbon and activated carbon fibers are commonly used adsorbents for the adsorption recovery or adsorption removal of VOCs. However, many chlorinated VOCs are small molecule compounds. For example, the diameter of a dichloromethane molecule is only about 0.3 nm, and it has a strong adsorption force on super-microporous materials because the relative pore walls of the super-microporous channels can create an adsorption effect superposition effect. The main micropore distribution of general activated carbon or activated carbon fibers is greater than 0.9 nm, so there are problems such as weak adsorption force and low adsorption capacity. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, the present invention provides a super-microporous carbon material, a preparation method thereof, and an application thereof. The preparation method adsorbs phenolic compounds onto a porous carbon material and then pyrolyzes them, so that carbon atoms are deposited on the surface of the pores of the porous carbon material, reducing the micropore diameter of the porous carbon material and increasing the super-micropore volume, thereby enhancing the adsorption force on small molecule volatile organic compounds such as dichloromethane.

[0005] For this reason, a first aspect of the present invention provides a preparation method of a super-microporous carbon material, and the preparation method includes:

[0006] Contacting a porous carbon material with a phenolic compound and performing pyrolysis treatment to obtain the super-microporous carbon material.

[0007] The super-microporous carbon material can be prepared by using the preparation method provided by the present invention. The super-microporous carbon material has a relatively high super-micropore volume and has good adsorption capacity for dichloromethane.

[0008] According to an embodiment of the present invention, the phenolic compound includes at least one of phenol, benzenediol, and benzenetriol.

[0009] According to an embodiment of the present invention, the porous carbon material includes activated carbon.

[0010] According to an embodiment of the present invention, the mass ratio of the porous carbon material to the phenolic compound is (5-20):1.

[0011] According to an embodiment of the present invention, the contact time is 0.2 h - 24 h.

[0012] According to an embodiment of the present invention, the contact includes at least one of the following methods:

[0013] Mixing the porous carbon material with a solution containing phenolic compounds;

[0014] Mixing the porous carbon material with a solution containing phenolic compounds and performing a shaking treatment;

[0015] Mixing the porous carbon material with a solution containing phenolic compounds and performing a stirring treatment;

[0016] Flowing the solution containing phenolic compounds through a packed column filled with a porous carbon material.

[0017] According to an embodiment of the present invention, the temperature of the pyrolysis treatment is 700 °C - 1100 °C.

[0018] According to an embodiment of the present invention, the time of the pyrolysis treatment is 0.5 h - 3 h.

[0019] According to an embodiment of the present invention, the pyrolysis treatment is carried out in an inert atmosphere.

[0020] According to an embodiment of the present invention, the total volume of ultra-micropores in the ultra-microporous carbon material accounts for 5% - 15% of the total pore volume;

[0021] Among them, the pore diameter of the ultra-micropores is 0 - 0.8 nm and not 0.

[0022] The second aspect of the present invention provides an ultra-microporous carbon material obtained by the preparation method according to the first aspect.

[0023] The ultra-microporous carbon material provided by the present invention has a relatively high ultra-micropore volume and has good adsorption capacity for small molecule volatile organic compounds such as dichloromethane.

[0024] The third aspect of the present invention provides the application of the ultra-microporous carbon material obtained by the preparation method according to the first aspect or the ultra-microporous carbon material according to the second aspect in the control of volatile organic compound pollution, and the volatile organic compounds include dichloromethane.

[0025] The beneficial effects of the present invention compared with the prior art:

[0026] By heating and pyrolyzing the phenolic compounds adsorbed on the porous carbon material, carbon atoms are deposited on the surface of the pores of the porous carbon material, reducing the pore diameter of the porous carbon material and increasing the number of ultra-micropores. The pore diameter of the ultra-micropores matches the size of dichloromethane small molecules, and the adsorption forces of the opposite pore walls on dichloromethane are superimposed, ensuring a relatively high adsorption capacity for dichloromethane.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 The cumulative pore volume diagrams of the ultra-microporous carbon material prepared in Example 2 of the present invention and untreated granular activated carbon are shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiments of the present invention will be described in detail below. The following described embodiments are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0031] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Further, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0032] In the ranges disclosed herein, the endpoints and any value are not limited to the exact range or value. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and a single point value, and between single point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0033] To make the present invention easier to understand, certain technical and scientific terms are specifically defined below. Unless otherwise clearly defined elsewhere in this document, all other technical and scientific terms used herein have the meanings commonly understood by those of ordinary skill in the art to which the present invention pertains.

[0034] In this document, the term "comprising" or "including" is an open expression, that is, it includes the content specified by the present invention, but does not exclude other aspects.

[0035] In this document, the terms "optionally", "optional" or "option" generally mean that the subsequent events or conditions may or may not occur, and this description includes the cases where the events or conditions occur and the cases where the events or conditions do not occur.

[0036] According to an embodiment of the present invention, a first aspect of the present invention provides a method for preparing a super-microporous carbon material, and the preparation method includes:

[0037] Contacting a porous carbon material with a phenolic compound and performing a thermal cracking treatment to obtain the super-microporous carbon material.

[0038] By heating and cracking the phenolic compound adsorbed on the porous carbon material, carbon atoms are deposited on the surface of the pores of the porous carbon material, reducing the pore size of the porous carbon material and increasing the number of super-micropores. The pore size of the super-micropores matches the size of small molecules such as dichloromethane, and the adsorption forces of the opposite pore walls on small molecule volatile organic compounds such as dichloromethane are superimposed, ensuring a high adsorption capacity for small molecule volatile organic compounds such as dichloromethane.

[0039] According to a specific embodiment of the present invention, the type of the phenolic compound is not particularly limited. As some specific examples, the phenolic compound includes at least one of phenol, benzenediol, and benzenetriol. Specifically, the arrangement of phenolic hydroxyl groups in benzenediol and benzenetriol is not particularly limited. For example, the phenolic hydroxyl groups can be in the ortho, meta, or para position.

[0040] According to a specific embodiment of the present invention, the type of the porous carbon material is not particularly limited. As some specific examples, the porous carbon material includes, but is not limited to, activated carbon. Specifically, the morphology of the activated carbon is not particularly limited. For example, it can be granular activated carbon or activated carbon fiber.

[0041] According to a specific embodiment of the present invention, the mass ratio of the porous carbon material to the phenolic compound is (5-20):1. As some specific examples, the mass ratio of the porous carbon material to the phenolic compound can be 5:1, 10:1, 15:1, 20:! etc.

[0042] According to a specific embodiment of the present invention, the contact time is 0.2h-24h. As some specific examples, the contact time can be 0.2h, 0.5h, 1h, 2h, 5h, 10h, 15h, 20h, 24h, etc.

[0043] According to a specific embodiment of the present invention, the contact method is not particularly limited. As some specific examples, the contact includes at least one of the following methods:

[0044] Mixing the porous carbon material with a solution containing a phenolic compound;

[0045] Mixing the porous carbon material with a solution containing a phenolic compound and performing a shaking treatment;

[0046] Mixing the porous carbon material with a solution containing a phenolic compound and performing a stirring treatment;

[0047] Flow a solution containing phenolic compounds through a packed column filled with a porous carbon material.

[0048] According to specific embodiments of the present invention, the type of solvent in the solution containing phenolic compounds is not particularly limited. As some specific examples, the solvent includes but is not limited to water.

[0049] According to specific embodiments of the present invention, the temperature of the pyrolysis treatment is 700°C - 1100°C. As some specific examples, the temperature of the pyrolysis treatment can be 700°C, 800°C, 900°C, 1000°C, 1100°C, etc.

[0050] According to specific embodiments of the present invention, the time of the pyrolysis treatment is 0.5 h - 3 h. As some specific examples, the time of the pyrolysis treatment can be 0.5 h, 1 h, 2 h, 3 h, etc.

[0051] According to specific embodiments of the present invention, the pyrolysis treatment is carried out in an inert atmosphere. Specifically, the inert atmosphere is not particularly limited. As some specific examples, the inert atmosphere includes but is not limited to nitrogen.

[0052] According to specific embodiments of the present invention, the total volume of ultra - micropores in the ultra - microporous carbon material accounts for 5% - 15% of the total pore volume; wherein, the pore diameter of the ultra - micropores is 0 - 0.8 nm and not 0.

[0053] According to specific embodiments of the present invention, the preparation method further includes: contacting the porous carbon material with phenolic compounds, filtering, drying, and performing pyrolysis treatment to obtain the ultra - microporous carbon material.

[0054] According to an embodiment of the present invention, a second aspect of the present invention provides an ultra - microporous carbon material obtained by the preparation method according to the first aspect.

[0055] The ultra - microporous carbon material provided by the present invention has a relatively high ultra - micropore volume and has good adsorption capacity for small - molecule volatile organic compounds such as dichloromethane.

[0056] According to an embodiment of the present invention, a third aspect of the present invention provides the application of the ultra - microporous carbon material obtained by the preparation method according to the first aspect or the ultra - microporous carbon material according to the second aspect in the control of volatile organic compound pollution, and the volatile organic compounds include dichloromethane.

[0057] The solution of the present invention will be explained below in conjunction with embodiments. Those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. For those without specific techniques or conditions noted in the embodiments, the techniques or conditions described in the literature in the art or according to the product specifications are followed. For reagents or instruments without the manufacturer noted, they are all conventional products that can be obtained through commercial purchase.

[0058] Examples 1 - 8:

[0059] Examples 1 - 8 provide a super - microporous carbon material and a preparation method thereof. The preparation method includes the following steps:

[0060] Place 100 mL of an aqueous solution of phenolic compound (A) with a concentration of 0.1 wt% in a 150 - mL stoppered conical flask, and then add 1 g of activated carbon material (B) to this solution. Place the conical flask in a bench - top constant - temperature oscillator and oscillate for 3 h at ambient temperature to adsorb the phenolic compound (A) onto the surface of the activated carbon. Use a suction filtration device to separate the solid, and then place it in an oven for drying. Place the dried solid in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to the set temperature (T), hold for the set time (t), and after cooling, obtain the super - microporous carbon material.

[0061] Among them, the types of raw materials and condition parameters used in Examples 1 - 8 are shown in Table 1. The cumulative pore volume diagrams of the super - microporous carbon material prepared in Example 2 and the untreated granular activated carbon are as Figure 1 shown.

[0062] Table 1

[0063] A B T(℃) t(h) Example 1 Phenol Granular activated carbon 700 2 Example 2 Phenol Granular activated carbon 900 2 Example 3 Phenol Granular activated carbon 1100 2 Example 4 Phenol Activated carbon fiber 900 2 Example 5 Phenol Granular activated carbon 900 0.5 Example 6 Phenol Granular activated carbon 900 3 Example 7 Hydroquinone Granular activated carbon 900 2 Example 8 Phloroglucinol Granular activated carbon 900 2

[0064] Example 9

[0065] This example provides a super - microporous carbon material and a preparation method thereof. The preparation method includes the following steps:

[0066] Place 250 mL of an aqueous phenol solution with a concentration of 0.1 wt% in a 500 - mL beaker, add 5 g of granular activated carbon to this solution, and mechanically stir for 0.2 h at ambient temperature to adsorb phenol onto the surface of the granular activated carbon. Use a suction filtration device to separate the solid, and then place it in an oven for drying. Place the dried solid in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 900 °C, hold for 2 h, and after cooling, obtain the super - microporous carbon material.

[0067] Example 10

[0068] This embodiment provides a super-microporous carbon material and a preparation method thereof. The preparation method includes the following steps:

[0069] Place 100 mL of an aqueous phenol solution with a concentration of 0.1 wt% in a 250 mL beaker. Add 1 g of granular activated carbon to this solution and let it stand at ambient temperature for 24 hours to allow phenol to gradually adsorb onto the surface of the granular activated carbon. Use a suction filtration device to separate the solid, and then place it in an oven for drying. Place the dried solid in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 900 °C, hold for 2 h, and after cooling, obtain the super-microporous carbon material.

[0070] Example 11

[0071] This embodiment provides a super-microporous carbon material and a preparation method thereof. The preparation method includes the following steps:

[0072] Prepare 1 L of a phenol solution with a concentration of 0.06 wt% in a 2 L beaker. Fill 3 g of activated carbon fibers in a continuous flow tubular glass reactor with an inner diameter of 20 mm, and use a peristaltic pump to continuously circulate the phenol solution through the activated carbon fiber column (flow rate 30 mL / min) to adsorb phenol on the activated carbon fibers. After 3 h, take out the activated carbon fibers, dry them, place them in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 900 °C, hold for 2 h, and after cooling, obtain the super-microporous carbon material.

[0073] Comparative Example 1

[0074] This comparative example provides a carbon material and a preparation method thereof. The preparation method includes the following steps:

[0075] Place 1 g of granular activated carbon in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 700 °C, hold for 2 h, and after cooling, obtain the carbon material.

[0076] Comparative Example 2

[0077] This comparative example provides a carbon material and a preparation method thereof. The preparation method includes the following steps:

[0078] Place 1 g of granular activated carbon in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 900 °C, hold for 2 h, and after cooling, obtain the carbon material.

[0079] Comparative Example 3

[0080] This comparative example provides a carbon material and a preparation method thereof. The preparation method includes the following steps:

[0081] Place 1 g of granular activated carbon in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 1100 °C, keep the temperature for 2 h, and after cooling, obtain the carbon material.

[0082] Comparative Example 4

[0083] This comparative example provides a carbon material and a preparation method thereof. The preparation method includes the following steps:

[0084] Place 1 g of activated carbon fiber in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 900 °C, keep the temperature for 2 h, and after cooling, obtain the carbon material.

[0085] Comparative Example 5

[0086] This comparative example provides a carbon material and a preparation method thereof. The preparation method includes the following steps:

[0087] Place 100 mL of an aqueous solution of phenolic compound with a concentration of 0.1 wt% in a 150 mL stoppered conical flask, and then add 1 g of granular activated carbon to this solution. Place the conical flask in a bench-top constant temperature oscillator and oscillate for 3 h at ambient temperature to adsorb the phenolic compound onto the surface of the activated carbon. Use a suction filtration device to separate the solid. Place the obtained solid in a hydrothermal reaction kettle, add 10 mL of formaldehyde solution (concentration 36% - 38%) to it, then place the hydrothermal reaction kettle in an oven at 60 °C and process for 12 h. Filter the reaction solution by suction, and then place the solid in an oven to dry. Place the dried solid in a quartz tube with an inner diameter of 30 mm, introduce nitrogen with a flow rate of 100 mL / min, heat up to 900 °C, keep the temperature constant for 2 h, and after cooling, obtain the carbon material.

[0088] Test Example

[0089] Test the BET specific surface area, total pore volume, ultramicropore volume, and dichloromethane adsorption capacity of the carbon materials prepared in the examples and comparative examples and the activated carbon raw material without any treatment (blank control). The test results are shown in Table 2, and the test methods are as follows:

[0090] (1) BET specific surface area, total pore volume, ultramicropore volume test:

[0091] Use the nitrogen adsorption method to measure the BET specific surface area, total pore volume, and ultramicropore volume of the above various carbon materials. Among them, the total pore volume is calculated based on the nitrogen adsorption amount at a relative pressure of 0.99. Here, the ultramicropore volume refers to the cumulative pore volume with a pore diameter < 0.8 nm, which is read from the cumulative pore volume curve obtained by the NLDFT method.

[0092] (2) Dichloromethane adsorption capacity test:

[0093] The dynamic adsorption performance of dichloromethane in gas was evaluated in a continuous flow reactor. The evaluation conditions were as follows: temperature was 25 °C, dichloromethane concentration was 700 ppm, the balance gas was nitrogen, and the gas flow rate was 0.5 m / s. The adsorption capacity was calculated based on the dichloromethane adsorption breakthrough curve (using the time point with a 10% breakthrough rate as the breakthrough point).

[0094] Table 2

[0095]

[0096]

[0097] Figure 1 By comparing the cumulative pore size distribution curves of Example 2 and the original granular activated carbon, it can be seen that below a pore size of 1.4 nm, the cumulative pore volume of Example 2 is higher than that of the original granular activated carbon, while at larger pore sizes, the former's cumulative pore volume is lower than the latter's. This means that during the high-temperature treatment of the activated carbon adsorbed with phenol, the carbon atoms generated by the cracking of phenol are deposited on the surface of the larger pores, reducing the pore size. As a result, the micropore volume below 1.4 nm increases, but due to the deposition of carbon atoms occupying the internal space of the pores, the total pore volume of Example 2 decreases.

[0098] From the data in Table 2, it can be seen that by comparing the original granular activated carbon and the high-temperature-treated activated carbon obtained through Comparative Examples 1-3, as the treatment temperature increases, the specific surface area and total pore volume of the material decrease. However, compared with the original activated carbon, after high-temperature treatment, the ultramicropore volume of the material increases, and the adsorption capacity for dichloromethane also increases. The dichloromethane adsorption capacities after treatment at 700 °C, 900 °C, and 1100 °C increased by 8.2%, 12.9%, and 2.3% respectively. Similarly, by comparing the original activated carbon fiber and the material obtained through Comparative Example 4, it can be seen that after treatment at 900 °C, the ultramicropore specific surface area and total pore volume of the material decrease, but the ultramicropores increase, and the adsorption capacity for dichloromethane increases by 8.5%. This shows that ultramicropores play an important role in the adsorption of dichloromethane.

[0099] Comparing Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, Example 3 and Comparative Example 3, Example 4 and Comparative Example 4, the examples and the corresponding comparative examples were heat-treated at the same temperature. Generally, the specific surface area and total pore volume of the examples were lower than those of the corresponding comparative examples, but the ultramicropore volume and the adsorption amount of dichloromethane of the examples were higher than those of the corresponding comparative examples. In Examples 1-4, after the granular activated carbon or activated carbon fiber adsorbed phenol and then was heat-treated, the carbon atoms formed by the pyrolysis of phenol were deposited on the micropore surface of the original activated carbon material, reducing the micropore diameter. Therefore, the ultramicropore volume increased, enhancing the adsorption force for dichloromethane and thus increasing the adsorption amount. Compared with the original granular activated carbon or original activated carbon fiber, the adsorption amounts of dichloromethane of the materials obtained in Examples 1, 2, 3, and 4 increased by 16.4%, 49.4%, 12.9%, and 46.2% respectively.

[0100] In Examples 5 and 6, the granular activated carbon adsorbed with phenol was heat-treated at 900 °C for 0.5 and 3 hours respectively. The adsorption amounts of dichloromethane of the obtained materials increased by about 27.1% and 44.7% respectively, indicating that heat treatment for 0.5 and 3 hours could also improve the adsorption performance of the materials, but the improvement degree was lower than that of the material obtained in Example 2 (49.4%). For the raw materials used, heat treatment for 2 hours was more appropriate.

[0101] In Examples 7 and 8, hydroquinone and phloroglucinol were used as raw materials. Compared with the original granular activated carbon, the ultramicropore volume of the materials increased, and the adsorption amounts of dichloromethane increased by 35.3% and 29.4% respectively, indicating that using these two phenolic compounds could also modify the activated carbon.

[0102] When adsorbing phenol onto the granular activated carbon in Examples 9 and 10, the methods of stirring for 0.2 h to promote adsorption and standing for 24 h for adsorption were adopted respectively. Compared with the original granular activated carbon, the adsorption amounts of dichloromethane of the final products increased by 41.2% and 50.6% respectively, indicating that these two operation methods could also meet the adsorption of phenol onto the activated carbon.

[0103] During the operation of Example 11, the phenol solution was passed through the activated carbon fiber adsorption column in a continuous flow-through manner to adsorb phenol onto the surface of the activated carbon fiber. Compared with the original activated carbon fiber, the adsorption amount of dichloromethane of the final product increased by 39.6%, indicating that the continuous flow-through method could also meet the adsorption of phenol onto the activated carbon.

[0104] Under the same treatment conditions, the carbon material prepared from activated carbon fiber as the raw material had a larger ultramicropore volume than the carbon material prepared from granular activated carbon as the raw material (Comparative Example 4 and Comparative Example 2, Example 4 and Example 2), and the dichloromethane adsorption amount of the former was also higher than that of the latter.

[0105] In Comparative Example 5, after phenol was adsorbed onto granular activated carbon, it was hydrothermally treated with a formaldehyde solution. The purpose was to react with the phenol adsorbed on the surface of the activated carbon to form a resin polymer structure. After high-temperature pyrolysis, carbon atom deposition was formed on the surface of the activated carbon pores. However, the specific surface area, total pore volume, and ultramicropore volume of the carbon material obtained by this method were all lower than those of the material obtained in Example 2, and the dichloromethane adsorption amount was also significantly lower than that of the latter. This may be because resin pyrolysis caused blockage of more pores.

[0106] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0107] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a super-microporous carbon material, characterized in that, The preparation method includes: Contacting a porous carbon material with a phenolic compound and performing pyrolysis treatment to obtain the ultra-microporous carbon material.

2. The preparation method according to claim 1, wherein The phenolic compound includes at least one of phenol, benzenediol, and benzenetriol.

3. The preparation method according to claim 1, characterized in that, The porous carbon material includes activated carbon.

4. The preparation method according to claim 1, wherein The mass ratio of the porous carbon material to the phenolic compound is (5-20):

1.

5. The preparation method according to claim 1, characterized in that, The contact time is 0.2 h - 24 h.

6. The preparation method according to claim 1, characterized in that, The contact includes at least one of the following methods: Mixing the porous carbon material with a solution containing a phenolic compound; Mixing the porous carbon material with a solution containing a phenolic compound and performing shaking treatment; Mixing the porous carbon material with a solution containing a phenolic compound and performing stirring treatment; Flowing a solution containing a phenolic compound through a packed column filled with a porous carbon material.

7. The preparation method according to claim 1, characterized in that, The temperature of the pyrolysis treatment is 700°C - 1100°C; Optionally, the time of the pyrolysis treatment is 0.5 h - 3 h; Optionally, the pyrolysis treatment is carried out in an inert atmosphere.

8. The preparation method according to claim 1, characterized in that, The total volume of ultra-micropores in the ultra-microporous carbon material accounts for 5% - 15% of the total pore volume; Among them, the pore diameter of the ultra-micropores is 0 - 0.8 nm and not 0.

9. An ultra-microporous carbon material obtained by the preparation method according to any one of claims 1 - 8.

10. Use of the ultra-microporous carbon material obtained by the preparation method according to any one of claims 1-8 or the ultra-microporous carbon material according to claim 9 in the control of volatile organic compound pollution, characterized in that, The volatile organic compound includes dichloromethane.

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