Adsorption material containing graphene oxide, preparation method and application of adsorption material in removal of PAHs (polycyclic aromatic hydrocarbons)

Abstract

The invention provides an adsorption material containing graphene oxide, a preparation method and application of the adsorption material in removal of PAHs (polycyclic aromatic hydrocarbons), and relates to the technical field of adsorption and removal treatment of polycyclic aromatic hydrocarbons. The adsorption material is prepared from the following raw materials: a PAN / rGO nanofiber material, activated carbon and coconut shreds, the PAN / rGO nanofiber material is prepared from modified graphene oxide and polyacrylonitrile through electrostatic spinning. According to the specific raw materials and proportion, the prepared adsorption material containing the graphene oxide can be applied to removal of various PAHs in air, polycyclic aromatic hydrocarbons can be simply, conveniently, rapidly and efficiently separated and enriched, and the adsorption effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of polycyclic aromatic hydrocarbon adsorption and removal treatment, and particularly relates to an adsorption material containing graphene oxide, a preparation method thereof, and an application thereof in removing PAHs. Background Art

[0002] Polycyclic aromatic hydrocarbons (PAHs) are compounds composed of two or more aromatic rings in a fused or non-fused manner, including more than 150 compounds such as naphthalene, anthracene, phenanthrene, pyrene, etc. Some PAHs also contain nitrogen, sulfur, and cyclopentane. Common PAHs with carcinogenic effects are mostly four- to six-ring fused-ring compounds. PAHs have strong carcinogenicity and environmental persistence, seriously endangering the ecological environment and human health.

[0003] Research shows that the sources of polycyclic aromatic hydrocarbons in the atmosphere are mainly the following aspects:

[0004] (1) Natural sources. The contribution of nature to polycyclic aromatic hydrocarbons in the atmosphere is very limited. For example, the biosynthesis of terrestrial and aquatic plants and microorganisms in nature, forest and grassland fires, volcanic eruptions, etc., mainly constitute the natural background value of polycyclic aromatic hydrocarbons.

[0005] (2) Agricultural activity emission sources. The agricultural activity sources of polycyclic aromatic hydrocarbons in the atmosphere are mainly the open burning of crop straws and wood. Since most cases are incomplete combustion, a large amount of polycyclic aromatic hydrocarbons can be generated. At the same time, the emission amount of polycyclic aromatic hydrocarbons is related to the type of combustibles, combustion methods, and combustion temperatures. Most of the polycyclic aromatic hydrocarbons emitted by biomass combustion are 2-3 ring polycyclic aromatic hydrocarbons, such as naphthalene, acenaphthene, pyrene, etc.

[0006] (3) Fixed sources. Fixed sources are mainly the emissions from household daily life and industrial emissions. The emissions from household daily life mainly come from two ways: heating and cooking. For example, the operation of heating equipment in winter in the north will generate a large amount of polycyclic aromatic hydrocarbons, and at the same time, the heating systems and electronic products in households will also generate a certain amount of polycyclic aromatic hydrocarbons. The generation of polycyclic aromatic hydrocarbons in industrial activities mainly comes from the petrochemical industry, rubber and cement manufacturing, commercial power generation, and waste incineration, etc.

[0007] (4) Mobile sources. The polycyclic aromatic hydrocarbon pollution in cities mainly comes from mobile sources, including the exhaust gases emitted by cars, ships, airplanes, etc. Using different fuels, such as diesel, gasoline, coal, lubricating oil, etc., the components of the exhaust gases they emit will also vary.

[0008] For the application requirements of air purification, the development of efficient purification materials has become one of the research hotspots. Graphene and its derivatives have unique two-dimensional structures and stable physical and chemical properties, which are beneficial to improving the comprehensive performance of nanofiber materials. Graphene (GR) is a two-dimensional carbon nanomaterial composed of C atoms with sp 2 hybrid orbitals forming a hexagonal honeycomb lattice. It has low cost, is easy to prepare, has a large theoretical specific surface area (2630 m 2 / g), good thermal / chemical stability, high mechanical strength (the elastic modulus of defect-free graphene is 1 TPa, and the fracture strength is 130 GPa), good light transmittance (about 97.7%), and has certain antibacterial activity, showing great application potential in the field of air purification. In the existing technology, a variety of technologies related to graphene adsorption have been disclosed.

[0009] For example, Chinese Patent CN117983182A discloses a method for adsorbing and removing PAHs in ODD by a graphene-based material. The TiO2-graphene material and an alcohol solution are added to the ODD solution together, and after mixing and shaking for a period of time, the TiO2-graphene material adsorbs PAHs in ODD. This invention uses a titanium dioxide-graphene composite material, which can significantly remove polycyclic aromatic hydrocarbons in the deodorization distillate. However, this technical solution mainly acts on the adsorption of PAHs in ODD, while PAHs are more present in the air. The study on the efficient purification behavior of graphene oxide thin films for indoor air pollution (Zou Weiwu, Gu Baoshan, Sun Shiqing, Wang Shidong, Li Jian, Yang Peiyan, Zhao Haoqing) discloses that GO thin films have good removal effects on PM 2.5 、PM 10 、HCHO, and VOCs in the air. However, in the existing technology, there is no technology that uses graphene oxide to adsorb PAHs in the air.

[0010] Based on this, developing an adsorption material containing graphene oxide that can effectively adsorb PAHs in the air is the research focus of researchers in this field. Summary of the Invention

[0011] In view of the above problems, the present invention provides an adsorption material containing graphene oxide. By optimizing the raw materials and their ratios and optimizing the preparation method, an adsorption material containing graphene oxide with a significant adsorption effect on PAHs in the air is obtained.

[0012] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0013] On the one hand, the present invention provides an adsorption material containing graphene oxide, comprising the following raw materials: PAN / rGO nanofiber material, activated carbon, and coconut fiber; the PAN / rGO nanofiber material is prepared by electrospinning of modified graphene oxide and polyacrylonitrile.

[0014] Preferably, by mass parts, it comprises the following raw materials: 30 - 50 parts of PAN / rGO nanofiber material, 10 - 30 parts of activated carbon, and 1 - 15 parts of coconut fiber.

[0015] More preferably, by mass parts, it comprises the following raw materials: 30 - 45 parts of PAN / rGO nanofiber material, 10 - 25 parts of activated carbon, and 5 - 15 parts of coconut fiber.

[0016] Even more preferably, by mass parts, it comprises the following raw materials: 30 - 36 parts of PAN / rGO nanofiber material, 12 - 18 parts of activated carbon, and 6 - 8 parts of coconut fiber.

[0017] Preferably, the modification method of the modified graphene oxide comprises the following steps:

[0018] Mix graphene oxide with a solvent, disperse it, add bentonite and a surfactant, react, filter by suction, and dry to obtain modified graphene oxide.

[0019] Preferably, the dispersion is ultrasonic.

[0020] Preferably, the temperature of the reaction is 55 - 75 °C and the time is 5 - 10 h. More preferably, in step 1, the temperature of the reaction is 60 - 70 °C and the time is 6 - 8 h.

[0021] Preferably, the solvent is a mixture of dimethyl sulfoxide and toluene.

[0022] More preferably, the volume ratio of dimethyl sulfoxide to toluene is 1 - 6:1. Even more preferably, the volume ratio of dimethyl sulfoxide to toluene is 5:1.

[0023] Preferably, the surfactant is selected from at least one of sodium dodecyl sulfate, coconut oil amide propyl amine oxide, cetylpyridinium bromide, and polyepichlorohydrin dimethylamine.

[0024] More preferably, the surfactant is selected from at least one of sodium dodecyl sulfate and coconut oil amide propyl amine oxide.

[0025] Even more preferably, the surfactant is sodium dodecyl sulfate and coconut oil amide propyl amine oxide.

[0026] Preferably, the mass ratio of sodium dodecyl sulfate to coconut oil amide propyl amine oxide is 8 - 12:1. More preferably, the mass ratio of sodium dodecyl sulfate to coconut oil amide propyl amine oxide is 11:1.

[0027] Preferably, the material - liquid ratio of graphene oxide to the solvent is 1:8 - 12 g / mL; more preferably, the material - liquid ratio of graphene oxide to the solvent is 1:12 g / mL.

[0028] Preferably, the mass ratio of the graphene oxide, bentonite and surfactant is 80 - 120:10 - 25:1 - 5; more preferably, the mass ratio of the graphene oxide, bentonite and surfactant is 100:18:3.

[0029] On the other hand, the present invention provides a method for preparing the above-mentioned adsorption material containing graphene oxide, comprising the following steps:

[0030] S1: Mix polyacrylonitrile powder with a solvent, add modified graphene oxide, and obtain PAN / rGO nanofiber material by electrospinning;

[0031] S2: Mix the PAN / rGO nanofiber material, activated carbon and coconut fiber.

[0032] Preferably, in S1, the solvent is N,N-dimethylformamide;

[0033] Preferably, in S1, the material-liquid ratio of the polyacrylonitrile powder to the solvent is 1:8 - 12 g / mL; more preferably, in S1, the material-liquid ratio of the polyacrylonitrile powder to the solvent is 12 g / mL.

[0034] Preferably, in S1, the mass ratio of the polyacrylonitrile powder to the modified graphene oxide is 1:0.008 - 0.015; more preferably, in S1, the mass ratio of the polyacrylonitrile powder to the modified graphene oxide is 1:0.008 - 0.012. Even more preferably, in S1, the mass ratio of the polyacrylonitrile powder to the modified graphene oxide is 1:0.012.

[0035] Preferably, the parameters of the electrospinning are: the spinning temperature is 20 - 25 °C, the humidity is 35 - 45%, the voltage is 20 - 25 kV, and the feeding speed is 2.3 - 2.5 mL / h.

[0036] On the other hand, the present invention provides the application of the above-mentioned adsorption material containing graphene oxide in removing PAHs in the air.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. By modifying graphene oxide and then preparing GO-PAN nanofiber material with polyacrylonitrile (PAN), the present invention significantly enhances its adsorption effect on PAHs in the air.

[0039] 2. By optimizing the surfactant and its ratio, the present invention proves through experiments that sodium dodecyl sulfate and cocoamidopropylamine oxide can play a synergistic effect under a specific ratio, with high dispersibility, significantly improving the uniform dispersion and combination of each component, and significantly enhancing its adsorption effect on PAHs in the air.

[0040] 3. With the specific raw materials and ratio of the present invention, the prepared adsorption material containing graphene oxide can be applied to remove various PAHs in the air, capable of simply, rapidly, and efficiently separating and enriching polycyclic aromatic hydrocarbons, with good adsorption effect. Detailed implementation manners

[0041] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following combines specific embodiments to further clarify the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention. It is worth noting that the raw materials used in the present invention are all ordinary commercially available products, and no specific limitation is made on their sources. The technical and scientific terms used in the embodiments have the meanings commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0042] Example 1

[0043] An adsorption material containing graphene oxide, comprising the following raw materials:

[0044] 36 parts of PAN / rGO nanofiber material, 12 parts of activated carbon, and 6 parts of coconut fiber;

[0045] The PAN / rGO nanofiber material is prepared by electrospinning of modified graphene oxide and polyacrylonitrile.

[0046] The modification method of the modified graphene oxide comprises the following steps:

[0047] Mix 100 parts of graphene oxide with a solvent at a material-liquid ratio of 1:12 g / mL (a mixture of dimethyl sulfoxide and toluene, with a volume ratio of dimethyl sulfoxide to toluene of 5:1), ultrasonically disperse, add 18 parts of bentonite, 2.75 parts of sodium dodecyl sulfate, and 0.25 part of cocoamidopropylamine oxide, react at 60 °C for 6 h, filter by suction, and dry to obtain modified graphene oxide.

[0048] The preparation method of the described adsorption material containing graphene oxide comprises the following steps:

[0049] S1: 100 parts of polyacrylonitrile powder are mixed with N,N-dimethylformamide at a material-liquid ratio of 1:12 g / mL, 1.2 parts of modified graphene oxide are added, heated to 40 - 50 °C, and stirred for 0.5 - 1.5 h to obtain an electrospinning solution. PAN / rGO nanofiber material is obtained by electrospinning; the parameters of electrospinning are: spinning temperature is 25 °C, humidity is 42%, voltage is 22 kV, and the feeding rate is 2.5 mL / h.

[0050] S2: PAN / rGO nanofiber material, activated carbon, and coconut fiber are mixed to obtain an adsorption material containing graphene oxide.

[0051] Example 2

[0052] An adsorption material containing graphene oxide, comprising the following raw materials:

[0053] 50 parts of PAN / rGO nanofiber material, 30 parts of activated carbon, and 15 parts of coconut fiber;

[0054] The PAN / rGO nanofiber material is prepared by electrospinning from modified graphene oxide and polyacrylonitrile.

[0055] The modification method of the modified graphene oxide comprises the following steps:

[0056] 80 parts of graphene oxide are mixed with a solvent at a material-liquid ratio of 1:8 g / mL (a mixture of dimethyl sulfoxide and toluene, and the volume ratio of dimethyl sulfoxide to toluene is 6:1), ultrasonically dispersed, 10 parts of bentonite, 0.92 parts of sodium dodecyl sulfate, and 0.08 parts of coconut oil amide propyl amine oxide are added, reacted at 75 °C for 5 h, filtered by suction, and dried to obtain modified graphene oxide.

[0057] The preparation method of the described adsorption material containing graphene oxide comprises the following steps:

[0058] S1: 100 parts of polyacrylonitrile powder are mixed with N,N-dimethylformamide at a material-liquid ratio of 1:8 g / mL, 0.8 parts of modified graphene oxide are added, heated to 40 - 50 °C, and stirred for 0.5 - 1.5 h to obtain an electrospinning solution. PAN / rGO nanofiber material is obtained by electrospinning; the parameters of electrospinning are: spinning temperature is 20 °C, humidity is 45%, voltage is 25 kV, and the feeding rate is 2.3 mL / h.

[0059] S2: PAN / rGO nanofiber material, activated carbon, and coconut fiber are mixed to obtain an adsorption material containing graphene oxide.

[0060] Example 3

[0061] An adsorption material containing graphene oxide, comprising the following raw materials:

[0062] 30 parts of PAN / rGO nanofiber material, 10 parts of activated carbon, and 1 part of coconut fiber;

[0063] The PAN / rGO nanofiber material is prepared by electrospinning from modified graphene oxide and polyacrylonitrile.

[0064] The modification method of the modified graphene oxide comprises the following steps:

[0065] Mix 120 parts of graphene oxide with a solvent at a material-liquid ratio of 1:10 g / mL (a mixture of dimethyl sulfoxide and toluene, with a volume ratio of dimethyl sulfoxide to toluene of 1:1), ultrasonically disperse, add 25 parts of bentonite, 4.44 parts of sodium dodecyl sulfate, and 0.56 part of coconut oil amide propyl amine oxide, react at 55 °C for 10 h, filter by suction, and dry to obtain modified graphene oxide.

[0066] The preparation method of the adsorption material containing graphene oxide comprises the following steps:

[0067] S1: Mix 100 parts of polyacrylonitrile powder with N,N-dimethylformamide at a material-liquid ratio of 1:10 g / mL, add 1.5 parts of modified graphene oxide, heat to 40 - 50 °C, and stir for 0.5 - 1.5 h to obtain an electrospinning solution. Obtain the PAN / rGO nanofiber material by electrospinning; the parameters of electrospinning are: spinning temperature: 25 °C, humidity: 35%, voltage: 20 kV, and feeding rate: 2.5 mL / h.

[0068] S2: Mix the PAN / rGO nanofiber material, activated carbon, and coconut fiber to obtain the adsorption material containing graphene oxide.

[0069] Comparative Example 1

[0070] An adsorption material containing graphene oxide, compared with Example 1, the difference is the different raw material ratios:

[0071] Comprises the following raw materials:

[0072] 60 parts of PAN / rGO nanofiber material, 40 parts of activated carbon, and 20 parts of coconut fiber;

[0073] The PAN / rGO nanofiber material is prepared by electrospinning from modified graphene oxide and polyacrylonitrile.

[0074] The rest is the same as in Example 1.

[0075] Comparative Example 2

[0076] An adsorption material containing graphene oxide, compared with Example 1, the difference is the different raw material ratios:

[0077] It contains the following raw materials:

[0078] 28 parts of PAN / rGO nanofiber material, 8 parts of activated carbon, and 16 parts of coconut fiber;

[0079] The PAN / rGO nanofiber material is prepared by electrospinning of modified graphene oxide and polyacrylonitrile.

[0080] The rest is the same as in Example 1.

[0081] Comparative Example 3

[0082] An adsorption material containing graphene oxide, which is different from Example 1 in terms of raw materials:

[0083] It contains the following raw materials:

[0084] 36 parts of PAN / rGO nanofiber material and 18 parts of activated carbon;

[0085] The PAN / rGO nanofiber material is prepared by electrospinning of modified graphene oxide and polyacrylonitrile.

[0086] The rest is the same as in Example 1.

[0087] Comparative Example 4

[0088] An adsorption material containing graphene oxide, which is different from Example 1 in terms of raw materials:

[0089] It contains the following raw materials:

[0090] 36 parts of PAN / rGO nanofiber material and 18 parts of coconut fiber;

[0091] The PAN / rGO nanofiber material is prepared by electrospinning of modified graphene oxide and polyacrylonitrile.

[0092] The rest is the same as in Example 1.

[0093] Comparative Example 5

[0094] An adsorption material containing graphene oxide, which is different from Example 1 in that graphene oxide is used instead of modified graphene oxide.

[0095] Specifically:

[0096] It contains the following raw materials:

[0097] 36 parts of PAN / rGO nanofiber material, 12 parts of activated carbon, and 6 parts of coconut fiber;

[0098] The PAN / rGO nanofiber material is prepared by electrospinning of graphene oxide and polyacrylonitrile.

[0099] The preparation method of the adsorption material containing graphene oxide comprises the following steps:

[0100] S1: 100 parts of polyacrylonitrile powder and N,N-dimethylformamide are mixed at a material-liquid ratio of 1:12 g / mL, 1.2 parts of graphene oxide are added, heated to 40 - 50 °C, and stirred for 0.5 - 1.5 h to obtain an electrospinning solution. PAN / rGO nanofiber material is obtained by electrospinning; the parameters of electrospinning are: spinning temperature is 25 °C, humidity is 42%, voltage is 22 kV, and the advancing speed is 2.5 mL / h.

[0101] S2: The PAN / rGO nanofiber material, activated carbon and coconut fibers are mixed to obtain the adsorption material containing graphene oxide.

[0102] Comparative Example 6

[0103] An adsorption material containing graphene oxide, compared with Example 1, the difference is that the preparation method of the modified graphene oxide is different. Specifically:

[0104] The modification method of the modified graphene oxide comprises the following steps:

[0105] 100 parts of graphene oxide and a solvent are mixed at a material-liquid ratio of 1:12 g / mL (a mixture of dimethyl sulfoxide and toluene, and the volume ratio of dimethyl sulfoxide to toluene is 5:1), ultrasonically dispersed, 28 parts of bentonite, 5.5 parts of sodium dodecyl sulfate and 0.5 part of coconut oil amide propyl amine oxide are added, reacted at 60 °C for 6 h, filtered by suction, and dried to obtain the modified graphene oxide.

[0106] The rest is the same as in Example 1.

[0107] Comparative Example 7

[0108] An adsorption material containing graphene oxide, compared with Example 1, the difference is that the preparation method of the modified graphene oxide is different. Specifically:

[0109] The modification method of the modified graphene oxide comprises the following steps:

[0110] 100 parts of graphene oxide and dimethyl sulfoxide are mixed at a material-liquid ratio of 1:15 g / mL, ultrasonically dispersed, 18 parts of bentonite, 2.75 parts of sodium dodecyl sulfate and 0.25 part of coconut oil amide propyl amine oxide are added, reacted at 50 °C for 12 h, filtered by suction, and dried to obtain the modified graphene oxide.

[0111] The rest is the same as in Example 1.

[0112] Comparative Example 8

[0113] An adsorbent material containing graphene oxide, compared with Example 1, the difference is that the preparation method of the modified graphene oxide is different. Specifically:

[0114] The modification method of the modified graphene oxide comprises the following steps:

[0115] Mix 100 parts of graphene oxide with a solvent at a material-liquid ratio of 1:12 g / mL (a mixture of dimethyl sulfoxide and toluene, with a volume ratio of dimethyl sulfoxide to toluene of 5:1), ultrasonically disperse, add 18 parts of bentonite, 3 parts of sodium dodecyl sulfate, react at 60 °C for 6 h, filter by suction, and dry to obtain the modified graphene oxide.

[0116] The rest is the same as in Example 1.

[0117] Comparative Example 9

[0118] An adsorbent material containing graphene oxide, compared with Example 1, the difference is that the preparation method of the modified graphene oxide is different. Specifically:

[0119] The modification method of the modified graphene oxide comprises the following steps:

[0120] Mix 100 parts of graphene oxide with a solvent at a material-liquid ratio of 1:12 g / mL (a mixture of dimethyl sulfoxide and toluene, with a volume ratio of dimethyl sulfoxide to toluene of 5:1), ultrasonically disperse, add 18 parts of bentonite, 3 parts of coconut oil amide propyl amine oxide, react at 60 °C for 6 h, filter by suction, and dry to obtain the modified graphene oxide.

[0121] The rest is the same as in Example 1.

[0122] Comparative Example 10

[0123] An adsorbent material containing graphene oxide, compared with Example 1, the difference is that the preparation method of the modified graphene oxide is different. Specifically:

[0124] The modification method of the modified graphene oxide comprises the following steps:

[0125] Mix 117.5 parts of graphene oxide with a solvent at a material-liquid ratio of 1:12 g / mL (a mixture of dimethyl sulfoxide and toluene, with a volume ratio of dimethyl sulfoxide to toluene of 5:1), ultrasonically disperse, add 18 parts of bentonite, 0.458 parts of sodium dodecyl sulfate and 0.042 parts of coconut oil amide propyl amine oxide, react at 60 °C for 6 h, filter by suction, and dry to obtain the modified graphene oxide.

[0126] The rest is the same as in Example 1.

[0127] Comparative Example 11

[0128] The modification method of the modified graphene oxide comprises the following steps:

[0129] 102.5 parts of graphene oxide were mixed with a solvent at a solid-liquid ratio of 1:12 g / mL (a mixture of dimethyl sulfoxide and toluene, with a volume ratio of dimethyl sulfoxide to toluene of 5:1), ultrasonically dispersed, 18.5 parts of bentonite were added, and the reaction was carried out at 60 °C for 6 h. Then, filtration and drying were performed to obtain modified graphene oxide.

[0130] The rest was the same as in Example 1.

[0131] Test Example 1

[0132] Adsorption performance:

[0133] Using 99.999% high-purity N2 as the carrier gas, after passing through the pressure reducing valve, the N2 was divided into two paths and the flow rates of these two paths of gas were precisely controlled by mass flow controllers. The first path of N2 passed through a bubbler filled with naphthalene crystals. By introducing a certain flow rate of naphthalene gas into 10 mL of acetone and then concentrating it to 5 mL, a certain amount of the acetone solution containing naphthalene was taken, and the content of naphthalene in the solution was measured by GCMS, and then the concentration of naphthalene gas was obtained through calculation. The second path of N2 was used as the dilution gas and mixed with the first path of gas to finally obtain a mixed gas with a certain concentration of naphthalene. The mixed gas with a certain concentration of naphthalene was passed into an adsorption column filled with the adsorption materials prepared in Examples 1-3 and Comparative Examples 1-11 for adsorption testing.

[0134] First, a small amount of high-quality quartz wool was filled at one end of the adsorption column. 0.05 g of the adsorption materials prepared in Examples 1-3 and Comparative Examples 1-11 were weighed with an analytical balance accurate to one ten-thousandth and loaded into the adsorption column, and then the other end was filled with a small amount of high-quality quartz wool. The purpose was to prevent the powdered adsorption material from being carried out of the adsorption column by the gas flow, causing experimental errors. Before starting the adsorption performance test, the masses of the empty adsorption column and the adsorption column filled with the adsorption material were weighed respectively. When weighing, both ends of the adsorption column should be blocked to prevent the adsorption material from adsorbing other gases or water in the air. After weighing, the adsorption column was quickly moved into the adsorption device, and the adsorption column was vertically installed on the pipeline, and the gas passed through the adsorption material in the adsorption column from bottom to top. The adsorption device was a constant-temperature oven equipped with a gas pipeline, and the temperature in the oven was ensured to be 30 ± 0.5 °C during the adsorption test.

[0135] During the adsorption test, weighing was carried out every 30 - 60 min. When the mass difference between two adjacent weighings was less than 0.5 mg, it was considered that the adsorption reached equilibrium. The adsorption capacity at the adsorption equilibrium of the adsorption material could be calculated based on the mass difference before and after the adsorption performance test.

[0136] Throughout the entire adsorption performance test process, the total gas flow rate was always controlled at 200 mL / min, and the concentration of naphthalene in the mixed gas was controlled by adjusting the flow rates of naphthalene gas and dilution gas.

[0137] The results are shown in Table 1:

[0138] Table 1. Adsorption performance

[0139]

[0140]

[0141] From the data in Table 1, it can be seen that the adsorption capacity of Examples 1-3 for naphthalene is significantly higher than that of Comparative Examples 1-11, indicating that the adsorption capacity of the adsorption material containing graphene oxide prepared by the specific raw materials, ratios and preparation methods of the present invention is significantly improved.

[0142] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than limiting the protection scope of the present invention. Any simple modification or equivalent replacement of the technical solution of the present invention by those of ordinary skill in the art shall not depart from the essence and scope of the technical solution of the present invention.

Claims

1. An adsorption material containing graphene oxide, characterized in that: The invention comprises the following raw materials: PAN / rGO nanofiber material, activated carbon and coconut shreds; the PAN / rGO nanofiber material is prepared by electrostatic spinning of modified graphene oxide and polyacrylonitrile.

2. The adsorption material according to claim 1, characterized in that The invention comprises the following raw materials in parts by weight: 30-50 parts of PAN / rGO nanofiber material, 10-30 parts of activated carbon and 1-15 parts of coconut shreds.

3. The adsorption material according to claim 2, characterized in that The invention comprises the following raw materials in terms of weight: 30-45 parts of PAN / rGO nanofiber material, 10-25 parts of activated carbon and 5-15 parts of coconut shreds.

4. The adsorption material according to claim 3, characterized in that The invention comprises the following raw materials in parts by weight: 30-36 parts of PAN / rGO nanofiber material, 12-18 parts of activated carbon and 6-8 parts of coconut shreds.

5. The adsorption material according to claim 1, characterized in that The modification method of modified graphene oxide comprises the following steps: The graphene oxide is mixed with a solvent, dispersed, bentonite and a surfactant are added, reacted, filtered, and dried to obtain modified graphene oxide.

6. The adsorption material according to claim 5, characterized in that The reaction temperature is 55-75°C and the reaction time is 5-10h.

7. The adsorbent material according to claim 5, characterized in that The solvent is a mixture of dimethyl sulfoxide and toluene.

8. The adsorbent material according to claim 7, characterized in that The volume ratio of dimethyl sulfoxide to toluene is 1-6:

1.

9. The adsorbent material according to claim 5, characterized in that: The surfactant is selected from at least one of sodium lauryl sulfate, cocamidopropylamine oxide, hexadecylpyridinium bromide and polyepichlorohydrin dimethylamine.

10. The adsorption material according to claim 9, characterized in that The surfactant is selected from at least one of sodium lauryl sulfate and cocamidopropylamine oxide.

11. The adsorbent material according to claim 10, characterized in that The surfactants are sodium lauryl sulfate and cocamidopropylamine oxide.

12. The adsorbent material according to claim 11, characterized in that The mass ratio of the sodium lauryl sulfate to the cocamidopropylamine oxide is 8-12:

1.

13. The adsorbent material according to claim 5, characterized in that The material-liquid ratio of the graphene oxide to the solvent is 1:8-12 g / mL.

14. The adsorbent material according to claim 5, characterized in that The mass ratio of the graphene oxide, bentonite and surfactant is 80-120:10-25:1-5.

15. The method for preparing an adsorbent material containing graphene oxide according to any one of claims 1 to 14, characterized in that: The following steps are involved: S1: polyacrylonitrile powder is mixed with solvent, modified graphene oxide is added, and PAN / rGO nanofiber material is obtained by electrospinning; S2: PAN / rGO nanofiber material, activated carbon and coconut shreds mixed.

16. The preparation method according to claim 15, characterized in that: In S1, the solvent is N,N-dimethylformamide.

17. The preparation method according to claim 15, characterized in that: In S1, the solid-liquid ratio of the polyacrylonitrile powder to the solvent is 1:8-12 g / mL.

18. The preparation method according to claim 15, characterized in that: In S1, the mass ratio of the polyacrylonitrile powder to the modified graphene oxide is 1:0.008-0.

015.

19. Use of the adsorbent material containing graphene oxide according to any one of claims 1 to 14 in removing PAHs from the air.

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