Silicon-containing material with voc adsorption function, preparation method and application thereof

Abstract

The present application relates to the field of volatile organic compound treatment, and discloses a silicon-containing material with VOC adsorption function, and a preparation method and application thereof.The silicon-containing material has a large VOC adsorption capacity, high desorption performance, and is easy to regenerate.

Description

Technical Field

[0001] This invention relates to the field of volatile organic compound (VOC) treatment, specifically to silicon-containing materials with VOC adsorption function, their preparation methods, and applications. Background Technology

[0002] Volatile organic compounds (VOCs) are a general term for volatile organic compounds with melting points below room temperature and boiling points between 50 and 260°C, mainly originating from industrial production and transportation. Based on their chemical structures, VOCs can be classified into five categories: alkanes, alkenes, aromatic hydrocarbons, halogenated hydrocarbons, and oxygenated organic compounds. As one of the main factors in the formation of photochemical ozone and secondary organic aerosols, VOC emissions pose a significant threat to human health and the ecological environment. As a commonly used method for VOCs treatment, adsorption has attracted widespread attention due to its low cost, high efficiency, and the ability to recycle and reuse VOCs (Zhang X, Gao B, Creamer AE, et al. Journal of Hazardous Materials, 2017, 338, 102-123).

[0003] Although activated carbon and other carbon materials are widely used for the adsorption and removal of various VOCs due to their advantages such as large pore volume, simple operation, and low price, carbon materials also have problems such as poor thermal and chemical stability, flammability and explosiveness, difficulty in regeneration, easy pore clogging, poor hydrophobicity and selectivity (Makowski W, Kus'trowski P. Microporous and Mesoporous Materials, 2007, 102(1-3), 283-289), which seriously limit their practical application in industry.

[0004] Molecular sieves not only possess a large specific surface area but also exhibit strong hydrophobicity, good thermal and hydrothermal stability, and are non-toxic and harmless to the environment, making them promising candidates for adsorption applications. Hierarchical porous molecular sieves are composed of two or more different pore structures. This structure combines the characteristics of different pore structures and fully leverages the synergistic effects of multiple pore types. These advantages make hierarchical porous molecular sieves highly promising for VOCs adsorption. Therefore, developing a simple and environmentally friendly method for preparing hierarchical porous molecular sieves is of great significance. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and to provide silicon-containing materials with VOC adsorption function, their preparation methods and applications.

[0006] To achieve the above objectives, the present invention provides a method for preparing a silicon-containing material with VOC adsorption function. The method includes: hydrothermal crystallization of a crystallization raw material containing a silicon source, optionally an aluminum source, additive R1, additive R2, an alkali source, and a dispersant, wherein the weight ratio of the silicon source, R1, and R2 (calculated as SiO2) is 1000:1-150:10-300, the additive R1 is at least one of sugars, and the additive R2 is at least one of nitrogen-containing compounds.

[0007] A second aspect of the present invention provides a silicon-containing material with VOC adsorption function.

[0008] A third aspect of the present invention provides a method for processing VOCs, the method comprising: contacting the VOCs with a silicon-containing material as described above.

[0009] The fourth aspect of the present invention provides the application of silicon-containing materials as described above in the adsorption of VOCs.

[0010] Through the above technical solutions, the silicon-containing material of the present invention has a large VOC adsorption capacity, high desorption performance, and is easily regenerated (nitrogen purging is sufficient), and possesses a hierarchical porous structure. In a preferred embodiment of the present invention, high-temperature calcination is used, which gives the silicon-containing material a molecular sieve structure and good thermal stability. Furthermore, the preparation process of the present invention is simple, the raw materials are readily available, and it is easy to promote and apply. Attached Figure Description

[0011] Figure 1 This is a scanning electron microscope image of a silicon-containing material obtained according to a preferred embodiment of the present invention.

[0012] Figure 2 This is an XRD pattern of a silicon-containing material obtained according to a preferred embodiment of the present invention. Detailed Implementation

[0013] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0014] This invention provides a method for preparing a silicon-containing material with VOC adsorption function. The method is characterized by comprising: hydrothermal crystallization of a crystallization raw material containing a silicon source, optionally an aluminum source, additive R1, additive R2, an alkali source, and a dispersant, wherein the weight ratio of the silicon source, R1, and R2 (based on SiO2) is 1000:1-150:10-300, the additive R1 is at least one of carbohydrates, and the additive R2 is at least one of nitrogen-containing compounds.

[0015] In this invention, the aluminum source is a selectively contained substance (it can be used or not). The weight ratio of the aluminum source (calculated as Al2O3) to the silicon source (calculated as SiO2) can be 0-600:1000, such as 5:1000, 15:1000, 20:1000, 25:1000, 30:1000, 35:1000, 50:1000, 100:1000, 200:1000, 300:1000, 400:1000, 500:1000, 600:1000, or any value or range between the above values.

[0016] In this invention, the silicon source can be selected from substances commonly found in the art that can provide silicon, such as silicon oxide, silicic acid, silicates, silicate esters, and siloxanes. Preferably, the silicon source is selected from at least one of tetramethyl orthosilicate, tetraethyl orthosilicate, tetrapropyl orthosilicate, tetrabutyl orthosilicate, hexamethyldisiloxane, methyl silicone oil, and ethyl silicone oil.

[0017] In this invention, the aluminum source can be selected from substances commonly found in the art that can provide aluminum. For example, the aluminum source can be selected from at least one of aluminum alkoxides, aluminum oxide, aluminum hydroxide, aluminum salts, and aluminates. Preferably, the aluminum source is selected from at least one of aluminum isopropoxide, boehmite (AlOOH·nH2O, n = 0.08-0.62), anhydrous alumina (Al2O3), aluminum hydroxide, aluminum nitrate, aluminum chloride, aluminum sulfate, and sodium aluminate.

[0018] In a preferred embodiment of the present invention, the weight ratio of silicon source to R1, calculated as SiO2, is 1000:10-100, such as 1000:10, 1000:13, 1000:14, 1000:15, 1000:20, 1000:50, 1000:90, 1000:100, or any value or range between the above values.

[0019] In this invention, the additive R1 is at least one of the sugars commonly found in the art, but preferably, the additive R1 is selected from at least one monosaccharide. The monosaccharide can be an aldose and / or a ketose, and can be at least one of triose, tetroose, pentose, hexose, and heptose. Common monosaccharides such as glyceraldehyde, erythrose, thulose, arabinose, ribose, xylose, lyseose, glucose, mannose, fructose, and galactose are all suitable for this invention. More preferably, the additive R1 is selected from at least one of glucose, fructose, and mannose.

[0020] In a preferred embodiment of the present invention, the weight ratio of silicon source to R2, calculated as SiO2, is 1000:20-250, such as 1000:25, 1000:30, 1000:50, 1000:100, 1000:150, 1000:200, 1000:250, or any value or range between the above values.

[0021] In this invention, the additive R2 is at least one of the nitrogen-containing organic compounds commonly found in the art, but preferably, the additive R2 is selected from at least one nitrogen-containing compound with a nitrogen content ≥30% by weight (more preferably 30-70% by weight). The additive R2 can be a nitrogen-containing organic compound or a nitrogen-containing inorganic compound. Preferably, the carbon content of the additive is ≤30% by weight, more preferably ≤28% by weight. More preferably, the additive R2 is selected from at least one of urea, melamine, and ammonium nitrate.

[0022] According to a particularly preferred embodiment of the present invention, the weight ratio of R2 to R1 is 1-5, such as 1, 1.5, 1.8, 2, 2.2, 2.5, 3, 3.5, 4, 4.5, 5 or any value or range between the above values.

[0023] As mentioned above, by using specific weight amounts of specific types of additives R1 and R2, silicon-containing materials with superior performance can be obtained.

[0024] In this invention, OH - The weight ratio of the alkali source to the silicon source (based on SiO2) can be less than or equal to 2.8, preferably 0.02-2.5, such as 0.02, 0.05, 0.1, 0.15, 0.17, 0.18, 0.2, 0.3, 0.5, 1, 1.5, 2, 2.5, or any value or range between the above. The alkali source can be selected from substances commonly found in the art capable of hydrolyzing to produce hydroxyl groups. Preferably, the alkali source is selected from alkali metal hydroxides and / or ammonia, more preferably at least one of sodium hydroxide, potassium hydroxide, and ammonia. In this invention, ammonia is typically used as ammonia solution.

[0025] In this invention, the amount of dispersant used is such that the weight ratio of the dispersant to the silicon source (based on SiO2) is less than or equal to 20, preferably 5-15, such as 5, 8, 9, 10, 11, 12, 13, 14, 15, or any value or range between the above. The dispersant can be a substance commonly used in the art that promotes uniform dispersion of raw materials, but preferably, the dispersant is selected from at least one small molecule alcohol, particularly small molecule alcohols with 1-6 carbon atoms, especially monohydric alcohols with 1-6 carbon atoms, more preferably at least one of methanol, ethanol, n-propanol, and isopropanol.

[0026] In this invention, the amount of water used in the crystallization raw material can be such that the weight ratio of water to silicon source (calculated as SiO2) is 30-200, such as 30, 40, 45, 50, 55, 60, 80, 100, 150, 200 or any value or range between the above values.

[0027] In a preferred embodiment of the present invention, the conditions for hydrothermal crystallization include a temperature of 70-200°C, preferably 90-180°C, and more preferably 110-130°C.

[0028] In a preferred embodiment of the present invention, the hydrothermal crystallization conditions further include a time of 4-80 hours, preferably 5-60 hours, and more preferably 45-50 hours.

[0029] In this invention, preferably, the method may further include aging the crystallization raw materials before hydrothermal crystallization. The aging can be carried out at room temperature and pressure. Preferably, the aging conditions include: a temperature of 15-40℃ (room temperature) and a time of 5-24 hours, more preferably 11-13 hours.

[0030] In order to obtain a stable silicon-containing material, the method may further include drying and calcining the hydrothermal crystallization product sequentially after hydrothermal crystallization.

[0031] More preferably, the drying conditions include a temperature of 90-120°C and a time of 10-36 hours.

[0032] More preferably, the calcination conditions include a temperature of 400-600℃, more preferably 540-560℃. Even more preferably, the calcination conditions further include a time of 3-10 hours, more preferably 5-7 hours.

[0033] The present invention also provides a silicon-containing material with VOC adsorption function, characterized in that the silicon-containing material is prepared by the preparation method described above;

[0034] Alternatively, the silicon-containing material comprises Si and optionally Al, with a weight ratio of Si (based on SiO2) to Al (based on Al2O3) of 0-600 (e.g., 20, 30, 40, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600 or any value or range between the above), and the XRD pattern of the silicon-containing material has characteristic peaks of the MFI structure.

[0035] In the silicon-containing material of the present invention, Si and Al exist in the form of oxides.

[0036] Preferably, the silicon-containing material of the present invention is honeycomb-shaped and has a multi-level porous structure.

[0037] Preferably, the mesoporous specific surface area of ​​the silicon-containing material of the present invention is 350-600 m². 2 / g, more preferably 500-550m 2 / g.

[0038] Preferably, the total pore volume of the silicon-containing material of the present invention is 0.1-0.5 cm. 3 / g, more preferably 0.4-0.5cm 3 / g.

[0039] Preferably, the mesopore volume of the silicon-containing material of the present invention is 0.08-0.35 cm³. 3 / g, more preferably 0.25-0.33cm 3 / g.

[0040] Preferably, the average pore size of the silicon-containing material of the present invention is 2-8.5 nm, more preferably 5-7 nm.

[0041] The present invention also provides a method for processing VOCs, characterized in that the method includes: contacting the VOCs with the silicon-containing material as described above.

[0042] In this invention, there are no special requirements for the amount of silicon-containing material used. The VOC adsorption capacity of 100g of silicon-containing material is ≥10g of VOC. Therefore, when using the silicon-containing material for VOC treatment, those skilled in the art can determine the amount of silicon-containing material based on the adsorption capacity. Generally, the amount of silicon-containing material used can be 2-20g relative to each gram of VOC.

[0043] In this invention, the volatile organic compounds (VOCs) may include various common volatile organic compounds, including alkanes, alkenes, aromatic hydrocarbons (such as benzene, toluene, ethylbenzene, n-propylbenzene, isopropylbenzene, etc.), halogenated hydrocarbons, and oxygen-containing organic compounds.

[0044] In this invention, there are no special requirements for the contact conditions, and it can be carried out at room temperature and pressure.

[0045] The present invention also provides the application of silicon-containing materials as described above in the adsorption of VOCs.

[0046] The present invention will be described in detail below through examples. In the following examples or comparative examples, the room temperature is approximately "25°C".

[0047] Example 1

[0048] Mix 0.4 g of sodium aluminate, sodium hydroxide, glucose, urea, water and ethanol evenly, then add tetramethyl orthosilicate. Stir the prepared material at room temperature for 4 hours and let it stand for 12 hours to age. The aged material is then placed in a crystallization kettle with a polytetrafluoroethylene liner and crystallized at 120°C for 48 hours.

[0049] The weight ratios of each raw material are such that: Al2O3 / SiO2 = 0.03; R1 / SiO2 = 0.014; R2 / SiO2 = 0.028; OH - / SiO2=0.17; ethanol / SiO2=11; H2O / SiO2=50, where R1 and R2 represent sugar and nitrogen-containing organic matter, respectively.

[0050] The obtained crystallized product was washed with water, centrifuged, dried at 110℃ for 24 hours to obtain a solid sample, and then calcined at 550℃ for 6 hours.

[0051] Example 2

[0052] Mix 0.5 g of aluminum hydroxide, sodium hydroxide, fructose, melamine, water and methanol evenly, then add hexamethyldisiloxane. Stir the prepared material at room temperature for 5 hours and let it stand for 6 hours to age. Put the aged material into a crystallization kettle with a polytetrafluoroethylene liner and crystallize at 180°C for 4 hours.

[0053] The weight ratios of each raw material are such that: Al2O3 / SiO2 = 0.015; R1 / SiO2 = 0.05; R2 / SiO2 = 0.1; OH - / SiO2=0.5; ethanol / SiO2=15; H2O / SiO2=100, where R1 and R2 represent sugar and nitrogen-containing organic matter, respectively.

[0054] The obtained crystallized product was washed with water, centrifuged, dried at 120℃ for 25 hours to obtain a solid sample, and then calcined at 500℃ for 8 hours.

[0055] Example 3

[0056] Mix 1 gram of aluminum isopropoxide, ammonia, mannose, ammonium nitrate, water and ethanol evenly, then add methyl silicone oil (purchased from Sinopharm), stir the prepared material at room temperature for 8 hours, and let it stand for aging for 20 hours; put the aged material into a crystallization kettle with a polytetrafluoroethylene liner, and crystallize at 70°C for 80 hours.

[0057] The weight ratios of each raw material are such that: Al2O3 / SiO2 = 0.005; R1 / SiO2 = 0.1; R2 / SiO2 = 0.2; OH - / SiO2=2; ethanol / SiO2=10; H2O / SiO2=200, where R1 and R2 represent sugar and nitrogen-containing organic matter, respectively.

[0058] The obtained crystallized product was washed with water, centrifuged, dried at 90℃ for 36 hours to obtain a solid sample, and then calcined at 450℃ for 10 hours.

[0059] Example 4

[0060] The material was prepared according to the method of Example 1, except that sugar was replaced with ethylene glycol.

[0061] Example 5

[0062] The material was prepared according to the method of Example 1, except that the nitrogen-containing organic compound was replaced with tetrapropylammonium hydroxide.

[0063] Example 6

[0064] The material was prepared according to the method of Example 1, except that the amounts of sugar and nitrogen-containing organic matter were adjusted such that R1 / SiO2 = 1:1000 and R2 / SiO2 = 300:1000.

[0065] Example 7

[0066] The material was prepared according to the method of Example 1, except that the amount of sodium aluminate added was 0.

[0067] Comparative Example 1

[0068] The material was prepared according to the method of Example 1, except that the amount of sugar and nitrogen-containing organic matter used was such that R1 / SiO2 = 10 and R2 / SiO2 = 4.

[0069] Comparative Example 2

[0070] The material was prepared according to the method of Example 1, except that the sugar was replaced with a nitrogen-containing organic compound.

[0071] Comparative Example 3

[0072] The material was prepared according to the method of Example 1, except that the nitrogen-containing organic matter was replaced with sugar.

[0073] Comparative Example 4

[0074] The material was prepared according to the method of Example 1, except that the sugar was replaced with a triblock copolymer (polyoxyethylene-polyoxypropylene-polyoxyethylene, P123, CAS NO.9003-11-6).

[0075] Comparative Example 5

[0076] The material was prepared according to the method of Example 1, except that the nitrogen-containing organic compound was replaced with glycerophosphate.

[0077] Comparative Example 6

[0078] The material was prepared according to the method of Example 1, except that sodium hydroxide was not used.

[0079] Comparative Example 7

[0080] The material was prepared according to the method of Example 1, except that ethanol was not used.

[0081] Test Example 1

[0082] The morphology and structure of the materials obtained in the above embodiments and comparative examples were analyzed and characterized, and the results are shown in Table 1.

[0083] Elemental analysis (X-ray fluorescence method, referring to GB / T 30905-2014) showed that the weight ratios of Si (calculated as SiO2) to Al (calculated as Al2O3) in the materials obtained in Examples 1-3 were 45, 80, and 230, respectively.

[0084] The morphology of the material was observed using a scanning electron microscope (SEM, model S-4800 field emission scanning electron microscope), and the XRD pattern of the material was determined using an X'Pert PRO X-ray diffractometer. The mesoporous specific surface area, total pore volume, mesoporous pore volume, and average pore size of the material were measured using N2 adsorption / desorption curves. The SEM image of the material obtained in Example 1 is shown below. Figure 1 As shown, from Figure 1 It can be seen that the silicon-containing material of the present invention has a hierarchical porous structure, although not shown, but SEM images of other embodiments are similar. Figure 1 Similarly, both show a hierarchical porous structure; the XRD pattern of the material obtained in Example 1 is as follows. Figure 2 As shown, from Figure 2 Characteristic peaks with diffraction angles of 2θ = 7.9°, 8.8°, 23.2°, and 24° can be observed, which are attributed to the characteristic peaks of the MFI-type zeolite structure; although not shown, the XRD test results of other embodiments are similar. Figure 1 Similarly, this indicates that the silicon-containing material obtained by the present invention has an MFI structure.

[0085] Table 1

[0086]

[0087] Test Example 2

[0088] The materials obtained in the above examples and comparative examples were used for VOC adsorption. The specific steps were as follows: Gas containing 1000 ppm VOCs (mainly toluene) was introduced into an adsorption tank containing silicon-containing material. When the VOCs concentration at the outlet of the adsorption tank was equivalent to that at the inlet, the gas flow was stopped, and the weight difference of the silicon-containing material before and after adsorption was measured. The adsorbent was desorbed by purging the silicon-containing material with adsorbed gas at room temperature and pressure with nitrogen gas at a flow rate of 100 ml / min for 2 hours, and the weight of the silicon-containing material after purging was measured. The adsorbent was regenerated by reintroducing VOCs gas into the silicon-containing material after nitrogen purging. When the VOCs concentration at the outlet of the adsorption tank was equivalent to that at the inlet, the gas flow was stopped, and the weight difference of the silicon-containing material before and after adsorption was measured. The formulas for calculating the adsorption capacity are as follows:

[0089] Adsorption capacity = Weight difference before and after adsorption / Weight of silicon-containing material loaded × 100%

[0090] Resolution = (Weight difference of adsorbent before and after purging) / (Weight difference before and after adsorption) × 100%

[0091] Regenerability = Weight difference before and after re-adsorption / Weight of silicon-containing material loaded × 100%

[0092] The results are shown in Table 2.

[0093] Table 2

[0094]

[0095]

[0096] The results above show that the material obtained by adopting the preferred embodiment of the present invention has a significantly better effect in adsorbing VOCs.

[0097] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing a silicon-containing material with VOC adsorption function, characterized in that, The preparation method includes: hydrothermal crystallization of a crystallization raw material containing a silicon source, an optional aluminum source, additive R1, additive R2, an alkali source, and a dispersant, wherein the weight ratio of the silicon source (calculated as SiO2), the aluminum source (calculated as Al2O3), and R1 to R2 is 1000:0-600:10-100:20-250, the additive R1 is at least one of glucose, fructose, and mannose, and the additive R2 is selected from at least one of urea, melamine, and ammonium nitrate; The method further includes drying and calcining the hydrothermal crystallization product sequentially after hydrothermal crystallization; The roasting conditions include a temperature of 400-600℃ and a time of 3-10h.

2. The preparation method according to claim 1, wherein, The weight ratio of R2 to R1 is 1-5.

3. The preparation method according to claim 1 or 2, wherein, The silicon source is selected from at least one of silicon oxide, silicic acid, silicates, silicate esters and siloxanes; And / or, the aluminum source is selected from at least one of aluminum alkoxides, aluminum oxides, aluminum hydroxides, aluminum salts, and aluminates.

4. The preparation method according to claim 3, wherein, The silicon source is selected from at least one of tetramethyl orthosilicate, tetraethyl orthosilicate, tetrapropyl orthosilicate, tetrabutyl orthosilicate, hexamethyldisiloxane, methyl silicone oil, and ethyl silicone oil; And / or, the aluminum source is selected from at least one of aluminum isopropoxide, boehmite, anhydrous alumina, aluminum hydroxide, aluminum nitrate, aluminum chloride, aluminum sulfate, and sodium aluminate.

5. The preparation method according to claim 1 or 2, wherein, With OH - The weight ratio of the alkali source to the silicon source (calculated using SiO2) is less than or equal to 2.

8.

6. The preparation method according to claim 5, wherein, With OH - The weight ratio of the alkali source to the silicon source (SiO2) is 0.02-2.

5.

7. The preparation method according to claim 5, wherein, The alkali source is selected from alkali metal hydroxides and / or ammonia.

8. The preparation method according to claim 5, wherein, The alkaline source is at least one of sodium hydroxide, potassium hydroxide, and ammonia.

9. The preparation method according to claim 1 or 2, wherein, The amount of the dispersant used is such that the weight ratio of the dispersant to the silicon source, calculated as SiO2, is less than or equal to 20.

10. The preparation method according to claim 9, wherein, The amount of the dispersant used is such that the weight ratio of the dispersant to the silicon source, calculated as SiO2, is 5-15.

11. The preparation method according to claim 9, wherein, The dispersant is selected from at least one of small molecule alcohols.

12. The preparation method according to claim 9, wherein, The dispersant is at least one of methanol, ethanol, n-propanol, and isopropanol.

13. The preparation method according to claim 1 or 2, wherein, The amount of water used in the crystallization raw material is such that the weight ratio of water to silicon source (calculated as SiO2) is 30-200.

14. The preparation method according to claim 1 or 2, wherein, The conditions for hydrothermal crystallization include: a temperature of 70-200℃ and a time of 4-80h.

15. The preparation method according to claim 14, wherein, The conditions for hydrothermal crystallization include: a temperature of 90-180℃ and a time of 5-60h.

16. The preparation method according to claim 14, wherein, The method also includes aging the crystallization raw materials before hydrothermal crystallization, with aging conditions including a temperature of 15-40℃ and a time of 5-24h.

17. The preparation method according to claim 1, wherein, The drying conditions include a temperature of 90-120℃ and a time of 10-36 hours.

18. A silicon-containing material with VOC adsorption function, characterized in that, The silicon-containing material is prepared by the preparation method described in any one of claims 1-17.

19. The silicon-containing material according to claim 18, wherein, Si and Al exist in the form of oxides; And / or, the silicon-containing material is honeycomb-shaped; And / or, the mesoporous specific surface area of ​​the silicon-containing material is 350-600 m². 2 / g; And / or, the total pore volume of the silicon-containing material is 0.1-0.5 cm³. 3 / g; And / or, the mesopore volume of the silicon-containing material is 0.08-0.35 cm³. 3 / g; And / or, the average pore size of the silicon-containing material is 2-8.5 nm.

20. A method for processing VOCs, characterized in that, The method includes contacting the VOC with the silicon-containing material as described in claim 18 or 19.

21. The method according to claim 20, wherein, The amount of silicon-containing material used is 2-20g relative to the amount of VOC per gram.

22. The application of the silicon-containing material according to claim 18 or 19 in the adsorption of VOCs.

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