阅读说明：本技术 一种基于多层石墨烯的复合材料及其制备方法与应用 (Composite material based on multilayer graphene and preparation method and application thereof ) 是由 孙桂芳 徐传海 刘太奇 吴锦程 赵晓敏 韩子夜 侯兴汉 申静 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种基于多层石墨烯的复合材料及其制备方法与应用,该基于多层石墨烯的复合材料是多层石墨烯通过高分子材料负载于活性碳上的混合物；其制备方法是将多层石墨烯分散高分子材料溶液中制得多层石墨烯分散液,然后将活性炭置于所述多层石墨烯分散液中浸渍2～4h制得初始复合材料,再将所述初始复合材料于100～150℃真空环境下活化2～4h,从而即制得所述基于多层石墨烯的复合材料。本发明能够实现对低浓度VOC进行快速、高效的吸附,有效解决了现有吸附剂对含有低浓度空气污染物的室内环境去除效果不明显、不彻底、吸附速率慢等技术问题,而且制备工艺简单、成本低廉、不产生二次污染、在一定条件下可以再生重复使用。(The invention discloses a composite material based on multilayer graphene and a preparation method and application thereof, wherein the composite material based on multilayer graphene is a mixture of multilayer graphene loaded on activated carbon through a high molecular material; the preparation method comprises the steps of preparing a multilayer graphene dispersion liquid from a multilayer graphene dispersion high polymer material solution, then placing active carbon into the multilayer graphene dispersion liquid to dip for 2-4 hours to prepare an initial composite material, and then activating the initial composite material for 2-4 hours at 100-150 ℃ in a vacuum environment, thereby preparing the multilayer graphene-based composite material. The invention can realize the rapid and efficient adsorption of low-concentration VOC, effectively solves the technical problems of unobvious and incomplete removal effect, slow adsorption rate and the like of the existing adsorbent on the indoor environment containing low-concentration air pollutants, and has the advantages of simple preparation process, low cost, no secondary pollution and capability of being regenerated and reused under certain conditions.)

1. The composite material based on the multilayer graphene is characterized in that the composite material based on the multilayer graphene is a mixture of the multilayer graphene and activated carbon, and the multilayer graphene is loaded on the activated carbon through a high molecular material.

2. The multi-layer graphene-based composite material of claim 1, wherein the multi-layer graphene comprises 0.5 wt% to 5 wt% of the total mass of the composite material.

3. The multi-layer graphene-based composite material according to claim 1 or 2, wherein the high polymer material is at least one of polyvinyl alcohol, polyurethane, a silane coupling agent, and carboxymethyl cellulose.

4. The multi-layer graphene-based composite material according to claim 1 or 2, wherein the activated carbon is a cubic brick honeycomb carbon.

5. A preparation method of a composite material based on multilayer graphene is characterized by comprising the following steps:

step 1, dispersing multilayer graphene in a high polymer material solution to prepare a multilayer graphene dispersion liquid;

step 2, placing activated carbon into the multilayer graphene dispersion liquid to be soaked for 2-4 hours, so as to prepare an initial composite material;

and 3, activating the initial composite material for 2-4 hours at the temperature of 100-150 ℃ in a vacuum environment, so as to obtain the multilayer graphene-based composite material of any one of claims 1-4.

6. The method of claim 5, wherein the multilayer graphene dispersion liquid comprises 0.25 wt% to 1.5 wt% of multilayer graphene.

7. The method of claim 5 or 6, wherein the polymer material solution comprises 0.25 wt% to 1.5 wt% of the polymer material.

8. The preparation method of the multilayer graphene-based composite material according to claim 5 or 6, wherein in the step 2, the activated carbon is placed in the multilayer graphene dispersion liquid, soaked for 2-4 hours, taken out and dried, so as to prepare the initial composite material.

9. Use of a multi-layer graphene-based composite material according to any one of claims 1 to 4 for adsorbing VOCs.

10. The use of the multi-layer graphene-based composite material according to claim 9, wherein the VOC concentration is 0.65-3 mg/m³。

Technical Field

The invention relates to the technical field of air purification, in particular to a composite material based on multilayer graphene and a preparation method and application thereof.

Background

At present, many products such as paints, floors, furniture and the like used for indoor decoration release air pollutants such as benzene series, formaldehyde, VOC (Volatile Organic Compounds) and the like at low concentration, and the air pollutants can be released for a long time (about two to four months, some time or even longer), the low-concentration air pollutants can not cause great harm to human bodies within a short time, but if the products are used in the environment for a long time, the low-concentration air pollutants can cause irreversible damage to the human bodies.

These air pollutants are difficult to detect because of their low concentration of released, colorless and substantially odorless. At present, the traditional activated carbon is usually adopted as an adsorbent to remove the air pollutants generated by indoor decoration, but the traditional activated carbon only has good removal efficiency aiming at the environment with higher concentration of the air pollutants, and has unobvious and incomplete removal effect and slow adsorption rate aiming at the indoor environment containing low-concentration air pollutants.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a composite material based on multilayer graphene and a preparation method and application thereof, so as to solve the technical problems in the prior art. The invention can realize the low-concentration VOC (the low-concentration VOC means the concentration of 0.65-3 mg/m)³VOC) is quickly and efficiently adsorbed, the technical problems that the existing adsorbent has unobvious and incomplete effect of removing indoor environment containing low-concentration air pollutants, slow adsorption rate and the like are effectively solved, the efficiency of a fresh air system for treating the air pollutants can be greatly improved, and the adsorbent is simple in preparation process, low in cost, free of secondary pollution and capable of being regenerated and reused under certain conditions.

The purpose of the invention is realized by the following technical scheme:

a composite material based on multi-layer graphene is a mixture of multi-layer graphene and activated carbon, and the multi-layer graphene is loaded on the activated carbon through a high molecular material.

Preferably, the multilayer graphene accounts for 0.5 wt% to 5 wt% of the total mass of the composite material.

Preferably, the polymer material is at least one of polyvinyl alcohol, polyurethane, a silane coupling agent and carboxymethyl cellulose.

Preferably, the activated carbon is a cubic brick-shaped honeycomb carbon.

A preparation method of a composite material based on multilayer graphene comprises the following steps:

step 1, dispersing multilayer graphene in a high polymer material solution to prepare a multilayer graphene dispersion liquid;

step 2, placing activated carbon into the multilayer graphene dispersion liquid to be soaked for 2-4 hours, so as to prepare an initial composite material;

and 3, activating the initial composite material for 2-4 hours at 100-150 ℃ in a vacuum environment, so as to obtain the composite material based on the multilayer graphene.

Preferably, the mass percentage of the multilayer graphene in the multilayer graphene dispersion liquid is 0.25 wt% to 1.5 wt%.

Preferably, the concentration of the polymer material in the polymer material solution is 0.25 wt% to 1.5 wt%.

Preferably, in the step 2, the activated carbon is placed in the multilayer graphene dispersion liquid to be soaked for 2-4 hours, and then taken out and dried, so that the initial composite material is prepared.

The application of the composite material based on the multilayer graphene is to use the composite material based on the multilayer graphene for adsorbing VOC.

Preferably, the concentration of the VOC is 0.65-3 mg/m³。

Compared with the prior art, the multilayer graphene in the composite material based on the multilayer graphene provided by the invention is loaded on the surface of the activated carbon through the high polymer material, the high polymer material is used for bearing the multilayer graphene, and the high polymer material forms the high polymer film on the activated carbon, the high polymer film does not block the pores of the activated carbon, the high polymer film has good adsorption performance, the multilayer graphene has good adsorption performance and reproducibility, and the microporous structure of the activated carbon is enriched by being attached to the surface of the activated carbon, so that the adsorption capacity of the air pollutants such as VOC is greatly improved, the indoor low-concentration air pollutants such as VOC can be quickly and efficiently adsorbed, and the problems that the existing adsorbent has an unobvious and incomplete removing effect on the low-concentration air pollutants are effectively solved, Slow adsorption rate, simple preparation process, low cost, no secondary pollution and capacity of being reused under certain conditions.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a graph comparing adsorption efficiencies of a conventional activated carbon, a multi-layer graphene-based composite material obtained in example 1 of the present invention, and a multi-layer graphene-based composite material obtained in example 2 of the present invention.

Fig. 2 is a scanning electron micrograph of the multilayer graphene-based composite material prepared in example 1 of the present invention.

Fig. 3 is a scanning electron micrograph of the multilayer graphene-based composite material prepared in example 2 of the present invention.

Detailed Description

The technical scheme in the embodiment of the invention is clearly and completely described below by combining the attached drawings in the embodiment of the invention; it is to be understood that the described embodiments are merely exemplary of the invention, and are not intended to limit the invention to the particular forms disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The terms that may be used herein are first described as follows:

the terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.

The term "consisting of … …" is meant to exclude any technical feature elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only to the elements explicitly recited in that clause, and elements recited in other clauses are not excluded from the overall claims.

The term "parts by weight" is intended to indicate the relationship of mass proportions between the various components, for example: if the X component is described as X parts by weight and the Y component is described as Y parts by weight, the mass ratio of the X component to the Y component is represented as X: Y; 1 part by weight may represent any mass, for example: 1 part by weight may be expressed as 1kg or 3.1415926 kg. The sum of the parts by weight of all components is not necessarily 100 parts and may be greater than 100 parts, less than 100 parts or equal to 100 parts. Parts, ratios and percentages described herein are by mass unless otherwise indicated.

When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 ~ 8" is recited, then the numerical range should be interpreted to include ranges of "2 ~ 7", "2 ~ 6", "5 ~ 7", "3 ~ 4 and 6 ~ 7", "3 ~ 5 and 7", "2 and 5 ~ 7", and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.

The composite material based on multilayer graphene provided by the invention, and the preparation method and application thereof are described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer. The reagents or instruments used in the examples of the present invention are not specified by manufacturers, and are all conventional products commercially available.

The invention provides a composite material based on multilayer graphene

The invention provides a composite material based on multilayer graphene, which is a mixture of multilayer graphene and activated carbon, wherein the multilayer graphene is loaded on the activated carbon through a high molecular material.

In particular, the multilayer graphene-based composite material may include the following embodiments:

(1) the multilayer graphene accounts for 0.5 wt% -5 wt% of the total mass of the composite material, so that the composite material has good adsorption performance.

(2) The multilayer graphene is preferably graphene powder prepared by a physical stripping method in the prior art, the average lamella is 2-8 layers, the thickness is 1-5 nanometers, the lamella diameter is 0.5-15 micrometers, and the specific surface area is 20-500 m²The composite material based on the multilayer graphene has good adsorption performance, low cost and good economic benefit.

(3) The high polymer material is at least one of polyvinyl alcohol, polyurethane, a silane coupling agent and carboxymethyl cellulose, and can bear multilayer graphene and form a high polymer film on activated carbon, so that the multilayer graphene can be supported on the activated carbon, and the high polymer material has adsorption performance after forming the high polymer film, and thus the overall adsorption performance of the composite material can be improved.

(4) The shape of the activated carbon is preferably cubic brick-shaped honeycomb carbon, and the specification of honeycomb holes of the honeycomb carbon can be 3.0mm multiplied by 3.0mm, also can be 1.5mm multiplied by 1.5mm, and is preferably 1.5mm multiplied by 1.5mm, so that the finally prepared composite material based on the multilayer graphene is in a cubic brick shape, is more stable in shape, is not easy to collapse, and is convenient to use. The activated carbon is at least one of coconut shell activated carbon, wood activated carbon, coal activated carbon and sludge activated carbon, so that the finally prepared composite material based on the multilayer graphene has good adsorption performance, is low in cost and has good economic benefit. In practical application, the activated carbon can adopt a water-resistant coconut shell activated carbon brick in the prior art, and the honeycomb pore specification of the water-resistant coconut shell activated carbon brick is 1.5mm multiplied by 1.5 mm.

The invention also provides a preparation method of the composite material based on the multilayer graphene

The invention provides a preparation method of a composite material based on multilayer graphene, which is used for preparing the composite material based on multilayer graphene and comprises the following steps:

step A, weighing the following raw materials in parts by weight: 0.25-1.5 parts of a high polymer material, 98.5-99.75 parts of deionized water, 0.5-1.5 parts of multilayer graphene and 9-13 parts of activated carbon; preferably, the raw materials are weighed according to the following weight parts: 0.5-1 part of a high polymer material, 99-99.5 parts of deionized water, 1-1.5 parts of multilayer graphene and 11-13 parts of activated carbon; in practical application, the raw materials are preferably weighed according to the following weight parts: 1 part of high polymer material, 99 parts of deionized water, 1.5 parts of multilayer graphene and 10.1356 parts of activated carbon.

And B, dissolving the high polymer material in the deionized water to prepare 0.25-1.5 wt% of high polymer material solution.

And C, dispersing the multilayer graphene in the high polymer material solution in the step B to prepare 0.25-1.5 wt% of multilayer graphene dispersion liquid.

And D, placing the activated carbon in the multilayer graphene dispersion liquid obtained in the step C, soaking for 2-4 hours, taking out, and drying at 60-100 ℃ to obtain the initial composite material.

And E, activating the initial composite material obtained in the step D for 2-4 hours at the temperature of 100-150 ℃ in a vacuum environment, so as to obtain the composite material based on the multilayer graphene.

Specifically, the preparation method of the multi-layer graphene-based composite material may include the following embodiments:

(1) the concentration of the high molecular material in the high molecular material solution is 0.25 wt% -1.5 wt%, so that a multilayer graphene dispersion liquid with a good dispersion effect can be prepared, and a formed high molecular material film cannot block an adsorption channel of the activated carbon; if the concentration of the polymer material in the polymer material solution is more than 1.5 wt%, a film formed by the polymer material solution can block an adsorption channel of the activated carbon; if the concentration of the polymer material in the polymer material solution is less than 0.25 wt%, the polymer material solution has a poor dispersing effect on the subsequent multilayer graphene dispersion liquid. In practical applications, the concentration of the polymer material in the polymer material solution may be any value between 0.25 wt%, 0.30 wt%, 0.35 wt%, 0.40 wt%, 0.45 wt%, 0.50 wt%, 0.55 wt%, 0.60 wt%, 0.65 wt%, 0.70 wt%, 0.75 wt%, 0.80 wt%, 0.85 wt%, 0.90 wt%, 0.95 wt%, 1.0 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, and 0.25 wt% to 1.5 wt%.

(2) The mass percentage of the multilayer graphene in the multilayer graphene dispersion liquid is 0.25 wt% -1.5 wt%, so that the multilayer graphene can be better loaded on the activated carbon; if the mass percentage of the multilayer graphene in the multilayer graphene dispersion liquid is more than 1.5 wt%, the multilayer graphene dispersion liquid cannot be well loaded on the surface of the activated carbon; if the mass percentage of the multilayer graphene in the multilayer graphene dispersion liquid is less than 0.25 wt%, the modification effect of the activated carbon is weaker when the concentration of the multilayer graphene dispersion liquid is lower. In practical applications, the mass percentage of the multi-layer graphene in the multi-layer graphene dispersion liquid may be any value between 0.25 wt%, 0.30 wt%, 0.35 wt%, 0.40 wt%, 0.45 wt%, 0.50 wt%, 0.55 wt%, 0.60 wt%, 0.65 wt%, 0.70 wt%, 0.75 wt%, 0.80 wt%, 0.85 wt%, 0.90 wt%, 0.95 wt%, 1.0 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, and 0.25 wt% to 1.5 wt%.

(3) In the step D, placing activated carbon into the multilayer graphene dispersion liquid to be soaked for 2-4 hours, so that multilayer graphene can be well loaded on the activated carbon; if the time for soaking the activated carbon in the multilayer graphene dispersion liquid exceeds 4 hours, the multilayer graphene dispersion liquid has a relatively obvious sedimentation phenomenon and is not beneficial to uniformly dispersing the multilayer graphene on the surface of the activated carbon; if the time for immersing the activated carbon in the multilayer graphene dispersion liquid is less than 2 hours, the multilayer graphene dispersion liquid and the activated carbon do not completely react, and the modification effect is influenced. In practical application, the time for immersing the activated carbon in the multilayer graphene dispersion liquid can be any value between 2h, 2.5h, 3h, 3.5h, 4h and 2-4 h.

(4) In the step D, after the activated carbon is placed in the multilayer graphene dispersion liquid for soaking for 2-4 hours, the activated carbon is taken out and dried, and preferably dried at 60-100 ℃, so that the moisture on the surface of the initial composite material can be dried to a certain extent, and the moisture is prevented from damaging vacuum equipment in subsequent operation; if the drying temperature is less than 60 ℃, the drying time is long, and the efficiency is low; if the drying temperature is more than 100 ℃, the energy consumption is overlarge. In practical applications, the drying temperature may be any value between 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ and 60-100 ℃.

(5) In the step E, activating the initial composite material obtained in the step D for 2-4 hours in a vacuum environment at 100-150 ℃, so that a composite material with good adsorption performance can be obtained; if the temperature of the vacuum environment is less than 100 ℃, the moisture in the composite material is difficult to well break through a film formed by the high polymer material solution, and the adsorption performance of the composite material is influenced; if the temperature of the vacuum environment is more than 150 ℃, the shape of the activated carbon is damaged, and the shape is collapsed; if the activation time is less than 2 hours, the moisture in the composite material cannot be completely dried; if the activation time is more than 4 hours, energy is excessively wasted. In practical applications, the temperature of the vacuum environment may be any value between 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 100-150 ℃, and the activation time may be any value between 2h, 2.5h, 3h, 3.5h, 4h and 2-4 h.

(6) In the composite material based on the multilayer graphene prepared in the step E, the multilayer graphene preferably accounts for 0.5 wt% -5 wt% of the total mass of the composite material, so that the composite material has better adsorption performance.

(III) the composite material and the preparation method provided by the invention have the beneficial effects

Firstly, preparing a multilayer graphene dispersion liquid by using a high polymer material solution as a solvent, then compounding activated carbon with the multilayer graphene dispersion liquid, and drying and activating to prepare the multilayer graphene-based composite material; the composite material based on the multilayer graphene has quick and efficient adsorption performance on indoor low-concentration air pollutants.

The composite material based on the multilayer graphene provided by the invention takes activated carbon as a carrier. The activated carbon is amorphous carbon, and the structure of the activated carbon contains graphite microcrystals but has a disordered layer structure; the active carbon mainly comprises carbon elements, but also contains elements such as nitrogen, oxygen, sulfur and the like; the active carbon has no polarity, the surface is hydrophobic, and the surface is easy to generate oxidation-reduction reaction, so that the surface generates various functional groups such as carboxyl, carbonyl and the like; the activated carbon material has high specific surface area, developed pore structure, wide raw material and low cost, and is widely used in the field of air purification adsorbents.

Compared with the prior art, the composite material based on the multilayer graphene and the preparation method and application thereof provided by the invention have the following advantages:

(1) the composite material based on the multilayer graphene provided by the invention utilizes a high molecular material as a carrier of the multilayer graphene, and forms a high molecular polymer film on the activated carbon, wherein the high molecular polymer film also has adsorption performance, and the high molecular polymer film does not block the aperture of the activated carbon, so that the adsorption capacity on air pollutants such as VOC (volatile organic Compounds) is improved.

(2) In the multilayer graphene-based composite material provided by the invention, the multilayer graphene has good adsorption performance and reproducibility, is attached to the surface of the active carbon, enriches the microporous structure of the active carbon, and has low price and low cost, so that the adsorption capacity of the multilayer graphene on air pollutants such as VOC (volatile organic compounds) is improved at low cost.

(3) The composite material based on multilayer graphene can be used for quickly adsorbing low concentration (the concentration is 0.65-3 mg/m)³) The VOC of (1). The composite material based on the multilayer graphene provided by the invention has quick and efficient adsorption performance on indoor low-concentration air pollutants, and does not containSecondary pollution is generated, the preparation process is simple, the price is low, and the catalyst can be regenerated and reused under certain conditions.

(4) The composite material based on the multilayer graphene is in a cubic brick shape, is stable in shape, is not easy to collapse and is convenient to use.

In conclusion, the embodiment of the invention can realize the rapid and efficient adsorption of low-concentration VOC, effectively solves the technical problems of unobvious and incomplete removal effect, slow adsorption rate and the like of the existing adsorbent on the indoor environment containing low-concentration air pollutants, can greatly improve the efficiency of a fresh air system for treating the air pollutants, has simple preparation process and low cost, does not generate secondary pollution, and can be regenerated and reused under certain conditions.

In order to more clearly show the technical scheme and the technical effects thereof provided by the present invention, the composite material based on multilayer graphene, the preparation method thereof, and the application thereof are described in detail with specific embodiments below.

Example 1

A composite material based on multilayer graphene is prepared by the following steps:

step b1, 1g of polymer material was dissolved in 199g of deionized water to obtain a 0.5 wt% polymer solution.

Step b2, taking 108.9g of the high polymer material solution prepared in the step b1, and dispersing 1.1g of multilayer graphene in the high polymer material solution to prepare 1 wt% of multilayer graphene dispersion liquid.

Step b3, placing 9.79453g of activated carbon into the multi-layer graphene dispersion liquid prepared in the step b2, soaking for 3 hours, taking out, and drying at 80 ℃ to obtain the initial composite material.

And b4, activating the initial composite material prepared in the step b3 for 3 hours in a vacuum environment at 120 ℃, so as to prepare the multilayer graphene-based composite material, wherein a Scanning Electron Microscope (SEM) picture of the composite material is shown in FIG. 2.

Example 2

A composite material based on multilayer graphene is prepared by the following steps:

step c1, 1g of polymer material was dissolved in 199g of deionized water to make a 0.5 wt% polymer solution.

Step c2, taking 105.1g of the high polymer material solution prepared in the step c1, and dispersing 1.6g of multi-layer graphene in the high polymer material solution to prepare the multi-layer graphene dispersion liquid with the concentration of about 1.5 wt%.

And c3, placing 10.82081g of activated carbon into the multi-layer graphene dispersion liquid prepared in the c2, soaking for 3 hours, taking out, and drying at 80 ℃ to obtain the initial composite material.

And c4, activating the initial composite material prepared in the step c3 for 3 hours in a vacuum environment at 120 ℃, so as to prepare the multilayer graphene-based composite material, wherein a Scanning Electron Microscope (SEM) picture of the composite material is shown in FIG. 3.

Performance detection

Respectively taking the traditional activated carbon, the composite material based on the multilayer graphene prepared in the embodiment 1 of the invention and the composite material based on the multilayer graphene prepared in the embodiment 2 of the invention as adsorbents to perform an adsorption performance experiment, so as to obtain an adsorption efficiency comparison graph shown in figure 1; the specific experimental operation is as follows: in the closed space, when the initial concentration of VOC in the closed space is 2-3 mg/m³Only one adsorbent is put in the closed space, and the VOC content in the closed space is detected after 3 minutes; experimental results show that the removal rate of VOC in the embodiments 1 to 2 of the invention is over 95%, VOC is completely removed in about 4 minutes, and the adsorption performance of the VOC is improved by about 12% -15% compared with that of the traditional activated carbon without loading multi-layer graphene, which indicates that the VOC removing agent can be used for quickly and efficiently adsorbing low-concentration VOC, and effectively solves the technical problems that the traditional activated carbon has an unobvious and incomplete effect on removing indoor environment containing low-concentration air pollutants, has a slow adsorption rate and the like.

In conclusion, the embodiment of the invention can realize the rapid and efficient adsorption of low-concentration VOC, effectively solves the technical problems of unobvious and incomplete removal effect, slow adsorption rate and the like of the existing adsorbent on the indoor environment containing low-concentration air pollutants, can greatly improve the efficiency of a fresh air system for treating the air pollutants, has simple preparation process and low cost, does not generate secondary pollution, and can be regenerated and reused under certain conditions.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.