Material for removing volatile organic compounds as well as preparation method and application of material

Abstract

The invention provides a material for removing volatile organic compounds as well as a preparation method and application of the material, and relates to the technical field of environment-friendly materials.The material for removing the volatile organic compounds comprises a composite material constructed by taking a zeolite molecular sieve as a carrier, an iron-based catalyst and carbon quantum dots with a synergistic catalysis effect are encapsulated in pore channels of the zeolite molecular sieve. The technical problems that in the prior art, a precious metal catalyst is high in cost or photoelectricity injection energy dependence is high, or health risks exist due to VOCs removal agent residues are solved, and the purposes that the preparation technology is simple, low in cost, efficient, environmentally friendly and harmless to the human body, and the VOCs removal efficiency and practicability are high are achieved.

Description

Technical Field

[0001] The present invention relates to the field of environmentally friendly materials, and in particular to a material for removing volatile organic compounds, and a preparation method and application thereof. Background Art

[0002] In recent years, with the rapid development of the interior decoration industry, the extensive use of adhesives, paints and synthetic materials has led to the widespread presence of volatile organic compounds (VOCs) in indoor environments and their continued slow release. These VOCs pose a potential threat to human health, and long-term exposure to such environments may induce chronic diseases. Although window ventilation is a traditional means of reducing VOCs, its application is greatly limited in actual living environments, such as during noise interference or air conditioning use. Therefore, it is particularly important to develop efficient indoor VOCs removal technology. In chemical principles, oxygen in the air can react with VOCs to produce harmless small molecules such as CO2 and H2O. This process is a spontaneous reaction in thermodynamics. However, due to the stability of VOCs molecules, the oxidation reaction kinetics at room temperature is extremely slow, which is difficult to meet the needs of practical applications. To this end, the introduction of catalysts to reduce the activation energy of VOCs oxidation and accelerate the reaction process has become the key. However, the current VOCs oxidation catalysts and catalytic technologies have the following significant defects:

[0003] 1. High cost of precious metal catalysts: Precious metals such as platinum and palladium show excellent catalytic performance in many chemical reactions, but their scarcity leads to high prices. For large-scale VOCs oxidation treatment, the large-scale use of precious metal catalysts is economically unaffordable, limiting their widespread application;

[0004] 2. Strong dependence on photoelectric injection energy: Injecting energy into the catalytic reaction system through light or electricity can significantly increase the reaction rate. However, this method not only increases equipment costs and operating expenses, but may also cause the problem of increased by-products. In addition, the application of photoelectric catalytic technology is limited in certain indoor environments (such as areas without light sources or electricity);

[0005] 3. VOCs removal agent residues and health risks: Existing VOCs removal technologies on the market often use the method of spraying chemical reagents and then sealing the room, and the residues may pose a risk to human health. Some VOCs removal agents are even more toxic than the VOCs being removed, exacerbating the safety issues of use.

[0006] In view of the above problems, there is an urgent need to develop a low-cost, efficient, environmentally friendly and harmless indoor VOCs removal technology to meet the high standards of air quality in modern home environments. Summary of the invention

[0007] One of the purposes of the present invention is to provide a material for removing volatile organic compounds, which has strong decomposition ability and catalytic performance for VOCs, is efficient, environmentally friendly and harmless to the human body, and has high VOCs removal efficiency and strong practicality.

[0008] The second object of the present invention is to provide a method for preparing a material for removing volatile organic compounds, which has simple process, low cost, good controllability and environmentally friendly raw materials.

[0009] The third purpose of the present invention is to provide an application of a material for removing volatile organic compounds, which can effectively remove VOCs pollution without causing secondary pollution and has outstanding application effect.

[0010] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0011] In a first aspect, the present invention provides a material for removing volatile organic compounds, comprising a composite material constructed with a zeolite molecular sieve as a carrier, wherein pores of the zeolite molecular sieve are encapsulated with an iron-based catalyst and carbon quantum dots having a synergistic catalytic effect.

[0012] In a second aspect, the present invention provides a method for preparing a material for removing volatile organic compounds, comprising the following steps:

[0013] a) dissolving 0.05-0.15% by mass of tetrapropylammonium hydroxide and 10-20% by mass of colloidal silicon dioxide in a mixed alkaline aqueous solution, stirring until completely dissolved to form a solution system, and continuously aging under heating, then dripping 0.01-0.02% by mass of ferrous chloride solution and 0.05-0.10% by mass of carbon quantum dots into the reaction mixture, stirring evenly to obtain a first solution, wherein the mixed alkaline aqueous solution includes at least two alkali metal ions;

[0014] b) subjecting the first solution of step a) to ultrasonic treatment to obtain a uniform mixture containing the iron-based catalyst and the carbon quantum dots;

[0015] c) subjecting the homogeneous mixture of step b) to a hydrothermal reaction, collecting a solid product generated by the hydrothermal reaction, centrifugally washing the solid product, baking, drying and cooling the solid product to obtain the material for removing volatile organic compounds.

[0016] Furthermore, the above preparation method may also include the following steps:

[0017] d) using ethanol to disperse the volatile organic matter removal material obtained in step c) to obtain a dispersion liquid with a dispersion concentration of 0.01 to 0.1 g / mL;

[0018] e) immersing the carbon fiber cloth in the dispersion of step d), taking it out after ultrasonic treatment, and then drying it to obtain the carbon fiber cloth for removing volatile organic compounds.

[0019] In a possible embodiment, the above-mentioned step a specifically includes: a1) preparing a mixed alkaline aqueous solution of aluminum hydroxide and sodium hydroxide; a2) adding tetrapropylammonium hydroxide solution to the mixed alkaline aqueous solution of step a1), and stirring and mixing to obtain a second solution; a3) adding colloidal silicon dioxide to the second solution of step a2), stirring and continuously aging for a set time under heating to obtain a reaction mixture; a4) dropping ferrous chloride solution and carbon quantum dots into the reaction mixture of step a3), and stirring to obtain the first solution.

[0020] Preferably, in the mixed alkaline aqueous solution in step a1), aluminum hydroxide and sodium hydroxide are mixed in a mass ratio of 1:1 to 1:8, and the total mass of aluminum hydroxide and sodium hydroxide accounts for 10% to 30% of the total mass of the mixed alkaline aqueous solution.

[0021] Preferably, in step a3), the heating temperature is 55-95° C., and the aging time is set to 5-20 h.

[0022] Preferably, in step a4), the concentration range of the ferrous chloride solution is 0.1-1.5 wt%, the equivalent particle size of the carbon quantum dots is 5-8 nm, and the concentration range of the carbon quantum dots is 0.01-0.3 wt%.

[0023] Preferably, in step a2, the mass proportion of tetrapropylammonium hydroxide in the second solution is 1-5%; and in step a3, the mass proportion of the colloidal silicon dioxide in the second solution is 35-65%.

[0024] Preferably, the temperature of the hydrothermal reaction is 150-200° C., and the time of the hydrothermal reaction is 5-30 min.

[0025] In a third aspect, an embodiment of the present invention further provides a use of the material for removing volatile organic compounds described in the first aspect in removing volatile organic compounds indoors.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The material for removing volatile organic compounds provided by the present invention is encapsulated into a zeolite molecular sieve by an iron-based material and carbon quantum dots. Due to the stability of the zeolite molecular sieve and the role of gas enrichment in the pores, the iron-based catalyst and carbon quantum dots with synergistic catalytic effects can be fixedly loaded in the zeolite molecular sieve using an encapsulation method. The iron-based material itself has a high catalytic activity, can capture VOCs and can decompose VOCs, and the two can work synergistically, while the small size and large specific surface area of ​​the carbon quantum dots are conducive to improving the catalytic efficiency and promoting the conversion of VOCs pollutants. The material provided by the present invention is enhanced through the synergistic cooperation of carbon quantum dots and iron-based materials, and the decomposition ability and catalytic performance of VOCs are enhanced, and the purpose of forming a long-lasting high-performance VOCs removal is achieved.

[0028] The preparation method of the material for removing volatile organic compounds provided by the present invention is to react tetrapropylammonium hydroxide, colloidal silicon dioxide, ferrous chloride solution and carbon quantum dots in a mixed alkaline aqueous solution containing a zeolite molecular sieve, thereby constructing a zeolite molecular sieve encapsulating carbon quantum dots and an iron-based catalyst. The preparation method of the present invention is not only simple in process and low in cost, but also has good controllability and environmentally friendly raw materials. Optionally, the material for removing volatile organic compounds is loaded onto a carbon fiber cloth by an impregnation ultrasonic method, and a carbon fiber cloth for removing VOCs is obtained after drying. The carbon fiber cloth is placed in an indoor fresh air outlet to continuously oxidize indoor VOCs.

[0029] The application of the volatile organic compound removal material provided by the present invention can effectively remove indoor VOCs pollution without generating secondary pollution, and the application effect is outstanding. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a material for removing volatile organic compounds, including a composite material constructed by using a zeolite molecular sieve as a carrier, wherein an iron-based catalyst and carbon quantum dots having a synergistic catalytic effect are encapsulated in the pores of the zeolite molecular sieve. Due to the stability of the zeolite molecular sieve and the role of the pores in enriching gas, the iron-based catalyst and carbon quantum dots having a synergistic catalytic effect can be fixed in the zeolite molecular sieve using an encapsulation method. Through the catalytic action of the iron-based catalyst, the oxidative decomposition reaction of VOCs can be promoted, and the small size and large specific surface area of ​​the carbon quantum dots are also conducive to improving the catalytic efficiency, thereby effectively promoting the conversion of pollutants such as VOCs, and achieving the purpose of forming a long-lasting and high-performance VOCs removal.

[0032] In this embodiment, the pore size of the zeolite molecular sieve is between 0.3 and 3 nm.

[0033] Preferably, the zeolite molecular sieve can be selected from silicon-aluminum molecular sieve, and the pore size of the silicon-aluminum molecular sieve is about 0.4-1.3nm; in actual use, the zeolite molecular sieve can also adopt the following types to better achieve the effect of improving catalytic efficiency and reducing costs; for example, it can be ZSM-5, which has a smaller pore size of about 0.54-0.56nm, and this type of molecular sieve is particularly suitable for catalytic cracking reactions, thereby improving catalytic activity and selectivity; it can be NaX, which has a larger pore size of 0.74-1.34nm, and this type of molecular sieve is suitable for catalytic reactions and has high thermal stability and hydrothermal stability; of course, it should be noted that in actual use, it is not limited to the above-mentioned ZSM-5 molecular sieve and NaX molecular sieve.

[0034] The above-mentioned materials for removing volatile organic compounds are widely used and can also be used for indoor air purification, such as bedrooms, living rooms, offices, etc., to help remove VOCs released by decoration materials, furniture, etc., and improve indoor air quality. For example, the above-mentioned materials for removing volatile organic compounds can be loaded onto carbon fiber cloth by impregnation ultrasonic method, and carbon fiber cloth for removing VOCs can be obtained after drying. The carbon fiber cloth is placed at the indoor fresh air outlet, and indoor VOCs can be continuously oxidized. The carbon fiber cloth is easy to place and replace; and it is safe and environmentally friendly: no secondary pollution is generated, and it is harmless to the human body and the environment. In addition, in some industrial environments with high requirements for air quality, such as electronics factories, pharmaceutical factories, etc., VOCs removal fiber cloth can be used to purify the air and protect the health of workers. The above-mentioned carbon fiber cloth can be used inside the car to absorb VOCs released by the interior decorative materials of the car, reduce odor, and improve the comfort of the ride.

[0035] The present invention also provides a method for preparing the above-mentioned material for removing volatile organic compounds, comprising the following steps:

[0036] a) dissolving 0.02-0.05% by mass of tetrapropylammonium hydroxide and 5-15% by mass of colloidal silicon dioxide in a mixed alkaline aqueous solution, stirring until completely dissolved to form a solution system, and continuously aging under heating, then dripping 0.08-0.18% by mass of FeCl2 solution and 0.05-0.15% by mass of carbon quantum dots into the reaction mixture, stirring evenly to obtain a first solution, wherein the mixed alkaline aqueous solution includes at least two alkali metal ions;

[0037] b) subjecting the first solution of step a) to ultrasonic treatment to obtain a uniform mixture containing the iron-based catalyst and the carbon quantum dots;

[0038] c) subjecting the homogeneous mixture of step b) to a hydrothermal reaction, collecting the solid product generated by the hydrothermal reaction, washing the solid product by centrifugation, drying and cooling the solid product, and obtaining a material for removing volatile organic matter. For example, injecting the homogeneous mixture into a hydrothermal kettle for reaction, the reaction temperature is 150-200° C., and the reaction time is 5-30 min. Then, the solid product is collected, washed by centrifugation, and dried in an oven at 80° C. overnight, and the material for removing volatile organic matter is obtained.

[0039] Furthermore, the above preparation method may also include the following steps:

[0040] d) using ethanol to disperse the volatile organic matter removal material obtained in step c) to obtain a dispersion liquid with a dispersion concentration of 0.01 to 0.1 g / mL;

[0041] e) Immersing the carbon fiber cloth in the dispersion of step d), subjecting it to ultrasonic treatment, for example, for 5 to 60 minutes, and then taking it out and drying it to obtain a carbon fiber cloth for removing volatile organic compounds.

[0042] The preparation method of the material for removing volatile organic compounds of the present invention is to react tetrapropylammonium hydroxide, colloidal silica, FeCl2 solution and carbon quantum dots in a mixed alkaline aqueous solution containing zeolite molecular sieve, thereby constructing a zeolite molecular sieve encapsulating carbon quantum dots and an iron-based catalyst. The preparation method of the present invention is not only simple in process and low in cost, but also has good controllability and environmentally friendly raw materials. Optionally, the material for removing volatile organic compounds is loaded onto a carbon fiber cloth by an impregnation ultrasonic method, and a carbon fiber cloth for removing VOCs is obtained after drying. The carbon fiber cloth is placed at an indoor fresh air outlet to continuously oxidize indoor VOCs.

[0043] The preparation method is further described below by way of examples. Unless otherwise specified, the materials in the following examples are prepared according to existing methods or directly purchased from the market.

[0044] The present invention uses zeolite molecular sieve as a carrier. Before the preparation method of a material for removing volatile organic compounds is implemented, the zeolite molecular sieve needs to be pretreated, which specifically includes the following steps:

[0045] A1) Selection of zeolite molecular sieve: Select zeolite molecular sieve with a pore size between 0.5 and 3 nm as a carrier; A2) Soak the zeolite molecular sieve in deionized water to remove soluble salts and impurities; then use a dilute acid or dilute alkali solution to wash to remove specific impurities, such as metal ions; After the above two washing steps are completed, rinse with deionized water until the pH value of the washing solution is close to neutral; A3) Drying: Filter the washed zeolite molecular sieve and dry it at room temperature to remove excess water (for situations where rapid drying is required, it can be dried in an oven at a lower temperature (such as 80 to 120°C) for several hours); A4) It should be noted that in the application of the present invention, the zeolite molecular sieve needs to be further chemically treated to remove specific impurities. impurities or improve the properties of zeolite molecular sieve (for example, using ion exchange to remove metal ions); A5) Activation: The zeolite molecular sieve is activated to improve its adsorption capacity or catalytic activity for specific molecules (activation methods include high temperature treatment in an air flow, steam treatment or chemical activation). In the present invention, the adsorption capacity or catalytic activity for iron-based catalysts and carbon quantum dots can be improved by activation treatment; A6) Characterization: After each step of pretreatment, the zeolite molecular sieve is characterized by appropriate analytical methods (such as X-ray diffraction, nitrogen adsorption-desorption isotherm, scanning electron microscopy, etc.) to ensure that its structure and performance meet expectations; A7) Storage: The pretreated zeolite molecular sieve should be properly stored to avoid moisture absorption or re-contamination.

[0046] Example 1

[0047] A method for preparing a material for removing volatile organic compounds comprises the following steps:

[0048] a1) Prepare a mixed alkaline aqueous solution of aluminum hydroxide and sodium hydroxide in a mass ratio of 1:1; and the total mass of aluminum hydroxide and sodium hydroxide accounts for 10% of the total mass of the mixed alkaline aqueous solution; a2) Add 0.5g of tetrapropylammonium hydroxide solution to the mixed alkaline aqueous solution of step a1), and stir and mix to obtain a second solution; a3) Add 20g of colloidal silica to the second solution of step a2), wherein colloidal silica is also called colloidal silica, also known as fumed silica, silica fume or pyrolytic silica. These silicas are commercially available. After stirring, continue aging at 55°C for 5h to obtain a reaction mixture; a4) Add 1.5wt% of FeCl2 solution and 0.3wt% of carbon quantum dots to the reaction mixture of step a3), and stir to obtain the first solution; b) Ultrasonicate the first solution of step a4) for 30min to obtain a uniform mixture. c) Inject the uniform mixture of step b) into a hydrothermal kettle for reaction, the reaction temperature is 150-200°C, and the reaction time is 5-30min. The solid product was then collected, washed by centrifugation and dried in an oven at 80°C overnight to obtain a material free of volatile organic compounds.

[0049] Example 2

[0050] a1) prepare a mixed alkaline aqueous solution of aluminum hydroxide Al(OH) and sodium hydroxide NaOH in a mass ratio of 1:8; and the total mass of aluminum hydroxide and sodium hydroxide accounts for 30% of the total mass of the mixed alkaline aqueous solution; a2) add 2.5g of tetrapropylammonium hydroxide solution to the mixed alkaline aqueous solution of step a1), and stir and mix to obtain a second solution; a3) add colloidal silica to the second solution of step a2), stir and continue to age at 95°C for 10h to obtain a reaction mixture; a4) dropwise add 0.1wt% FeCl2 solution and 0.01wt% carbon quantum dots to the reaction mixture of step a3), and stir to obtain the first solution; b) ultrasonically treat the first solution of step a4) for 30min to obtain a uniform mixture. c) inject the uniform mixture of step b) into a hydrothermal kettle for reaction, the reaction temperature is 150-200°C, and the reaction time is 5-30min. Then collect the solid product, centrifuge and wash it, and dry it in an oven at 80°C overnight to collect the material for removing volatile organic matter.

[0051] Example 3

[0052] A mixed alkaline aqueous solution of aluminum hydroxide Al(OH) and sodium hydroxide NaOH is prepared in a mass ratio of 1:5; and the total mass of aluminum hydroxide and sodium hydroxide accounts for 20% of the total mass of the mixed alkaline aqueous solution; a2) 0.5 g of tetrapropylammonium hydroxide solution is added to the mixed alkaline aqueous solution of step a1), and stirred to obtain a second solution; the remaining steps are the same as those in the above embodiment 2, and finally a material for removing volatile organic compounds is collected.

[0053] Comparative Example 1

[0054] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, no centrifugal washing and overnight drying in an oven at 80° C. are performed, and the remaining steps and process parameters are the same as those in Example 1 to obtain a material for removing volatile organic compounds.

[0055] Compared with the material for removing volatile organic compounds in Example 1, the material in Comparative Example 1 has the defect that impurities are present because centrifugal washing is not performed, and the obtained material for removing volatile organic compounds has defects.

[0056] Comparative Example 2

[0057] The difference between Comparative Example 2 and Example 2 is that ultrasonic treatment is not performed in Comparative Example 2, and the remaining steps and process parameters are the same as those in Example 1 to obtain a material for removing volatile organic compounds.

[0058] Compared with the material for removing volatile organic compounds in Example 1, the defect of the material in Comparative Example 2 is that the iron-based catalyst in the pores of the zeolite molecular sieve is unevenly distributed, and the obtained material for removing volatile organic compounds has defects.

[0059] Comparative Example 3

[0060] When other environmental conditions remain the same as those in Example 1, the material for removing volatile organic compounds in the present invention is replaced with precious metals such as platinum, palladium, etc. for removing VOCs.

[0061] Comparative Example 4

[0062] When other environmental conditions remain the same as those in Example 1, the material for removing volatile organic compounds in the present invention is replaced with a catalytic reaction system for removing VOCs by light or electricity.

[0063] Comparative Example 5

[0064] When other environmental conditions remain the same as those in Example 1, the material for removing volatile organic compounds in the present invention is replaced by a method of spraying chemical reagents and then sealing the room to remove VOCs.

[0065] Test example

[0066] The performance of the volatile organic compound removal materials obtained in Examples 1-3 and Comparative Examples 1-2 was tested, and the results are shown in Table 1.

[0067] The performance test method is:

[0068] 1. Clean 20m 3 Environmental chamber;

[0069] 2. Inject 0.6 mL of VOCs analytical pure dilution and seal the environmental chamber;

[0070] 3. Turn on the stirring device and test the VOCs concentration C0 in the environmental chamber after 30 minutes;

[0071] 4. Clean the environmental chamber and place the prepared samples to be tested into the environmental chamber;

[0072] 5. Inject 0.6 mL of VOCs analytical pure dilution and seal the environmental chamber;

[0073] 6. Turn on the stirring device and test the VOCs concentration C1 in the environmental chamber after 30 minutes;

[0074] 7. Calculation: Purification efficiency R = (C0-C1) / C0×100%.

[0075] Table 1

[0076]

[0077]

[0078] From the above performance tests, it can be seen that the VOCs removal rate of Examples 1-3 can reach 98%, almost completely removing VOCs; and the cost of Examples 1-3 is less than 400 yuan; the time spent on VOCs removal is after 30 minutes; and no harmful substances are produced. Although the cost used, the time spent on VOCs removal and the absence of harmful substances in Comparative Example 1-2 are not much different from those in Examples 1-3, the VOCs removal rate is much lower than that in Examples 1-3. Of course, the defects of Comparative Example 1-2 are not limited to those recorded here. The cost used in Comparative Example 3 is much greater than that in Examples 1-3. For large-scale VOCs oxidation treatment, the large-scale use of precious metal catalysts is economically unbearable, which limits its wide application. Of course, the defects of Comparative Example 4 are not limited to those recorded here. Comparative Example 4 not only increases equipment costs and operating expenses, but may also cause the problem of increased by-products. Of course, the defects of Comparative Example 4 are not limited to those recorded here. The VOCs removal rate of Comparative Example 5 is much lower than that of Examples 1-3. Of course, the defects of Comparative Example 5 are not limited to those recorded here.

[0079] It can be seen that Examples 1-3 are significantly superior to Comparative Examples 1-5 in terms of VOCs removal rate, VOCs removal time, VOCs removal cost, and the presence or absence of by-products.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A material for removing volatile organic compounds, characterized in that: The composite material comprises a zeolite molecular sieve as a carrier, wherein iron-based catalysts and carbon quantum dots having synergistic catalytic effects are encapsulated in the pores of the zeolite molecular sieve.

2. A method for preparing a material for removing volatile organic compounds as claimed in claim 1, characterized in that: The following steps are involved: a) dissolving 0.01-0.1% by mass of tetrapropylammonium hydroxide and 5-15% by mass of colloidal silicon dioxide in a mixed alkaline aqueous solution, stirring until completely dissolved to form a solution system, and continuously aging under heating, then dripping 0.02-0.05% by mass of ferrous chloride solution and 0.01-0.05% by mass of carbon quantum dots into the reaction mixture, stirring evenly to obtain a first solution, wherein the mixed alkaline aqueous solution includes at least two alkali metal ions; b) subjecting the first solution of step a to ultrasonic treatment to obtain a uniform mixture containing an iron-based catalyst and carbon quantum dots; c) subjecting the uniform mixture of step b to a hydrothermal reaction, collecting a solid product generated by the hydrothermal reaction, centrifugally washing the solid product, baking, drying and cooling the solid product to obtain the material for removing volatile organic compounds.

3. The preparation method according to claim 2, characterized in that: The following steps are also included: d) using ethanol to disperse the volatile organic matter removal material obtained in step c to obtain a dispersion having a dispersion concentration of 0.01 to 0.1 g / mL; e) immersing the carbon fiber cloth in the dispersion of step d, taking it out after ultrasonic treatment, and then drying it to obtain a carbon fiber cloth for removing volatile organic compounds.

4. The preparation method according to claim 2, characterized in that: The step a) tetrapropylammonium hydroxide, colloidal silicon dioxide, ferrous chloride solution and carbon quantum dots react in a mixed alkaline aqueous solution containing zeolite molecular sieves to obtain a first solution, specifically comprising: a1) preparing a mixed alkaline aqueous solution of aluminum hydroxide and sodium hydroxide; a2) adding tetrapropylammonium hydroxide solution to the mixed alkali aqueous solution of step a1, and stirring and mixing to obtain a second solution; a3) adding colloidal silicon dioxide to the second solution of step a2, stirring, and aging for a set time under heating to obtain a reaction mixture; a4) adding ferrous chloride solution and carbon quantum dots dropwise to the reaction mixture of step a3 and stirring to obtain the first solution.

5. The preparation method according to claim 4, characterized in that: In the mixed alkaline aqueous solution in step a1, aluminum hydroxide and sodium hydroxide are mixed in a mass ratio of 1:1 to 1:8, and the total mass of aluminum hydroxide and sodium hydroxide accounts for 10% to 30% of the total mass of the mixed alkaline aqueous solution.

6. The preparation method according to claim 4, characterized in that: In step a3, the heating temperature is 55-95° C., and the aging time is set to 5-20 hours.

7. The preparation method according to claim 4, characterized in that: The concentration range of the FeCl2 solution in step a4 is 0.1-1.5wt%, the equivalent particle size of the carbon quantum dots is 5-8nm, and the concentration range of the carbon quantum dots is 0.01-0.3wt%.

8. The preparation method according to claim 4, characterized in that: In step a2, the mass proportion of tetrapropylammonium hydroxide in the second solution is 1-5%; and in step a3, the mass proportion of the colloidal silicon dioxide in the second solution is 35-60%.

9. The preparation method according to any one of claims 2 to 8, characterized in that: The temperature of the hydrothermal reaction is 150-200° C., and the time of the hydrothermal reaction is 5-30 minutes.

10. Use of the material for removing volatile organic compounds according to claim 1 in removing volatile organic compounds indoors.

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