Barrier composition, barrier foaming agent, preparation method of barrier foaming agent, soil remediation foam and remediation method

Abstract

The invention belongs to the technical field of environmental protection, and relates to a blocking agent composition, a blocking foaming agent, a preparation method of the blocking foaming agent, soil remediation foam and a remediation method. The blocking agent composition comprises a component A, a component B and a component C, the component B is a compound selected from R4COO (CH2) nNH2 and / or R4COO (CH2) 2N < + > (CH3) 3; in the formula, R4 is straight chain alkyl of C10-C20; n is an integer from 2 to 10, preferably an integer from 2 to 6. Compared with the prior art, the barrier foaming agent disclosed by the invention has the following beneficial effects that the barrier foaming agent has good foaming capacity and stability, can play a role in barrier and repair for a long time, can be stored and used at room temperature, greatly improves the convenience and instantaneity of product use, does not need to additionally use a thickening agent or a foam stabilizer, simplifies the preparation process, and reduces the production cost. The use cost is reduced, the preparation process is simple, raw materials are cheap, easy to obtain, green and degradable, secondary pollution is avoided, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental protection, and in particular, relates to a barrier agent composition, a barrier foaming agent and a preparation method thereof, and a soil remediation foam and a remediation method. Background Art

[0002] The pollutants in petrochemical contaminated sites are mainly volatile organic compounds (VOCs), including low molecular weight halogenated hydrocarbons, simple aromatic hydrocarbons and benzene series. VOCs in soil, as a special type of soil pollutants, have characteristics different from other pollutants, such as concealment and accumulation. Because VOCs are harmful to the environment and have serious toxicity to the human body, they are difficult to control and will accumulate in the soil for a long time. Many countries have included VOCs in the list of priority controlled pollutants, and explicitly stipulate that VOCs-contaminated soil must be properly disposed of to ensure the safety of organisms and the environment.

[0003] At present, my country's research on the remediation of volatile organic polluted soil is still in the simulation test stage, and mainly focuses on heavy metal treatment. For the treatment of organic matter, especially VOCs, a set of technologies and processes that can be used on-site with low remediation costs, high efficiency and strong operability has not yet been found.

[0004] According to the development and application of contaminated site remediation technology in my country, in terms of remediation mode, my country's contaminated site remediation adopts more ex situ remediation treatment mode, that is, remediation through excavation, treatment, and backfilling, including landfill, cement kiln co-disposal, in situ ex situ desorption at room temperature and thermal desorption treatment, etc. During the ex situ remediation construction process of the contaminated soil remediation site, the excavation and transportation links cause large-scale disturbances to the contaminated soil, which changes the storage conditions of high-concentration organic pollutants that were originally in a relatively stable state, destroying the adsorption balance of VOCs in the soil. A large number of high-concentration organic pollutants are rapidly and massively diffused into the air in the form of gaseous and particulate matter, forming secondary pollution, which has adverse effects and harms on construction workers and surrounding residents.

[0005] Canevari first proposed in patent document US3850206 a method of using water-based foam covering to inhibit crude oil evaporation.

[0006] Patent US4874641 discloses a foam composition composed of olefin sulfonate, stearate and other ingredients. The patent discusses the effects of different formulations on the life of the foam, and applies the foam to suppress the odor of contaminated soil, achieving good results. However, the solubility of stearate in water is poor, and it needs to be dissolved under heating conditions before being prepared into a foaming liquid. Therefore, this foam composition lacks convenience and immediacy in use. Summary of the invention

[0007] The purpose of the present invention is to overcome the problem of VOCs diffusing into the air in large quantities, and to provide a barrier agent composition, a barrier foaming agent and a preparation method thereof, and a soil remediation foam and a remediation method. The barrier foaming agent can effectively prevent VOCs in the soil from diffusing into the air through foam barrier, and the barrier foaming agent is biodegradable and environmentally friendly.

[0008] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a barrier agent composition, comprising:

[0009] Component A: foaming agent;

[0010] Component B: a compound selected from formula (1) and / or formula (2);

[0011] R4COO(CH2) n NH2 formula (1)

[0012] R4COO(CH2)2N + (CH3)3 Formula (2)

[0013] In formula (1) and formula (2), R4 is a C10-C20 straight-chain alkyl group; n is an integer from 2 to 10, preferably an integer from 2 to 6.

[0014] A second aspect of the present invention provides a barrier foaming agent, which comprises the barrier agent composition and a solvent.

[0015] The third aspect of the present invention provides a method for preparing the barrier foaming agent, comprising the following steps:

[0016] Component B, component A and a solvent are mixed to obtain the barrier foaming agent.

[0017] A fourth aspect of the present invention provides a soil remediation foam, which is a foaming product of the barrier foaming agent.

[0018] A fifth aspect of the present invention provides a method for remediating soil contaminated by volatile organic compounds, comprising the following steps:

[0019] The soil remediation foam is coated on the soil contaminated by volatile organic compounds, with a coating thickness of 5 cm to 25 cm.

[0020] The beneficial effects of the present invention are at least in the following aspects:

[0021] First, the barrier foaming agent in the present invention has excellent foaming ability and stability, and can play a barrier and repair role for a long time.

[0022] Secondly, compared with the reported foam compositions, the barrier foaming agent in the present invention can be stored and used at room temperature, which greatly improves the convenience and immediacy of product use.

[0023] Thirdly, compared with the reported foam compositions, the barrier foaming agent of the present invention does not require the additional use of thickeners or foam stabilizers, which simplifies the preparation process and reduces the use cost.

[0024] Fourthly, the barrier foaming agent and soil remediation foam of the present invention have simple preparation processes, the raw materials are cheap and readily available, are green and degradable, have no secondary pollution, and are energy-saving and environmentally friendly.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a barrier agent composition, comprising:

[0028] Component A: foaming agent;

[0029] Component B: a compound selected from formula (1) and / or formula (2);

[0030] R4COO(CH2) n NH2 formula (1)

[0031] R4COO(CH2)2N + (CH3)3 Formula (2)

[0032] In formula (1) and formula (2), R4 is a C10-C20 straight-chain alkyl group; n is an integer from 2 to 10, preferably an integer from 2 to 6.

[0033] According to the present invention, preferably, based on the total weight of the barrier composition, the content of component A is 1-10wt%, preferably 1-5wt%, and the content of component B is 1-10wt%, preferably 2-6wt%.

[0034] According to the present invention, preferably, the mass ratio of the fatty carboxylic acid part R4COO- in the component B to the component A is 4:(0.5-4), preferably 4:(2-3).

[0035] In the present invention, the component B can be composed of a fatty carboxylic acid R4COOH and HO(CH2) nNH2 or choline reaction, preferably, the fatty carboxylic acid is selected from at least one of cinnamic acid, myristic acid, palmitic acid and stearic acid. By controlling the mass ratio of the fatty carboxylic acid to component A to be 4:(0.5-4), preferably 4:(2-3), the mass ratio of the fatty carboxylic acid part R4COO- in the aforementioned component B to component A also falls within the corresponding range.

[0036] According to the present invention, preferably, the foaming agent is selected from at least one of the compounds represented by formula (3) to formula (5);

[0037] R1OSO3M1 formula (3)

[0038] R2O(CH2CH2O)SO3M2 Formula (4)

[0039] R3SO3M3 formula (5)

[0040] In formula (3) to formula (5), R1, R2 and R3 are the same or different, and are each independently selected from at least one of a C10-C20 straight chain or branched alkyl group, a C10-C20 alkenyl group, a C10-C20 alkyl-substituted aryl group and a C10-C20 aryl-substituted alkyl group; M1, M2 and M3 are the same or different, and are each independently selected from a monovalent cation.

[0041] According to the present invention, preferably, R1, R2 and R3 are each independently selected from at least one of a C10-C16 straight chain or branched alkyl group, a C10-C16 alkenyl group, a C10-C16 alkyl-substituted aryl group and a C10-C16 aryl-substituted alkyl group; preferably, the C10-C16 alkenyl group is a C10-C16 α-alkenyl group.

[0042] According to the present invention, preferably, M1, M2 and M3 are each independently selected from at least one of sodium ions, potassium ions and ammonium ions; preferably, M1, M2 and M3 are all sodium ions.

[0043] According to the present invention, preferably, the component A is selected from at least one of sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium hexadecyl sulfate, sodium dodecylbenzene sulfonate, sodium hexadecylbenzene sulfonate, sodium C12-C18 α-olefin sulfonate and sodium lauryl alcohol polyoxyethylene ether sulfate.

[0044] A second aspect of the present invention provides a barrier foaming agent, which comprises the barrier agent composition and a solvent.

[0045] According to the present invention, preferably, based on 100 g of the weight of the solvent, the content of component A is 1-10 g, and the content of component B is 1-10 g.

[0046] According to the present invention, preferably, the solvent is water.

[0047] The third aspect of the present invention provides a method for preparing the barrier foaming agent, comprising the following steps:

[0048] Component B, component A and a solvent are mixed to obtain the barrier foaming agent.

[0049] According to the present invention, preferably, the preparation method comprises the following steps:

[0050] Reaction of fatty carboxylic acids with HO(CH2) n NH2 or choline are sequentially added to the solvent, heated to 40-90°C, reacted under stirring conditions, and the obtained reaction product is mixed with component A to obtain the barrier agent.

[0051] According to the present invention, preferably, with respect to 100 g of solvent, the amount of component A used is 1 to 10 g, and the amount of fatty carboxylic acid used is 1 to 10 g.

[0052] According to the present invention, preferably, the mass ratio of the fatty carboxylic acid to component A is 4:(0.5-4), preferably 4:(2-3).

[0053] According to the present invention, preferably, the fatty carboxylic acid is selected from at least one of cinnamic acid, myristic acid, palmitic acid and stearic acid.

[0054] A fourth aspect of the present invention provides a soil remediation foam, which is a foaming product of the barrier foaming agent.

[0055] The foaming may be achieved by various conventional foaming methods in the art, and specific methods include but are not limited to at least one of vigorous stirring, ultrasound and bubbling.

[0056] In some preferred embodiments of the present invention, the foaming treatment comprises: blowing gas, preferably air, into the foaming agent.

[0057] A fifth aspect of the present invention provides a method for remediating soil contaminated by volatile organic compounds, comprising the following steps:

[0058] The soil remediation foam is coated on the soil contaminated by volatile organic compounds, with a coating thickness of 5 cm to 25 cm.

[0059] The present invention will be further described below in conjunction with embodiments, but the scope of the present invention is not limited to these embodiments.

[0060] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or the conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be obtained through commercial channels.

[0061] In the following embodiments, unless otherwise specified, blowing refers to blowing air.

[0062] In the following examples, the method for determining the 25% liquid separation time is as follows: a certain mass of foam is placed in a funnel, and a clean beaker is placed under the funnel. After the foam is broken, the foam liquid is separated and drips into the beaker along the funnel. The mass of the precipitated liquid in the beaker is weighed, and the corresponding time is recorded. When the mass of the precipitated liquid reaches 25% of the initial foam mass, the time at this time is called the 25% liquid separation time.

[0063] Example 1

[0064] 4.00 g of palmitic acid and 0.95 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0065] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0066] All results are shown in Table 1.

[0067] Example 2

[0068] 4.00 g of palmitic acid and 1.17 g of 3-aminopropanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0069] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0070] All results are shown in Table 1.

[0071] Example 3

[0072] 4.00 g of palmitic acid and 1.83 g of 6-aminohexanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium dodecyl sulfate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0073] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0074] All results are shown in Table 1.

[0075] Example 4

[0076] 4.00 g of myristic acid and 1.07 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium dodecyl sulfate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam was 25%) was measured.

[0077] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0078] All results are shown in Table 1.

[0079] Example 5

[0080] 4.00 g of palmitic acid and 1.62 g of choline were added to 100 mL of deionized water, heated to 80° C. for 30 minutes under continuous stirring, and then 2.0 g of sodium dodecylbenzene sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam was 25%) was measured.

[0081] Weigh 10g of organic contaminated soil and place it in a 100ml beaker. Use Mini RAE 3000 VOC detector to measure the VOCs concentration above the soil. Cover the soil with the prepared foam to a height of 25cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0082] All results are shown in Table 1.

[0083] Example 6

[0084] 4.00 g of lauric acid and 1.50 g of 3-aminopropanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium lauryl polyoxyethylene ether sulfate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam was 25%) was measured.

[0085] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0086] All results are shown in Table 1.

[0087] Example 7

[0088] 4.00 g of stearic acid and 0.86 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0089] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0090] All results are shown in Table 1.

[0091] Example 8

[0092] 4.00 g of palmitic acid and 0.95 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 3.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0093] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0094] All results are shown in Table 1.

[0095] Example 9

[0096] 4.00 g of palmitic acid and 0.95 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 4.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0097] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0098] All results are shown in Table 1.

[0099] Example 10

[0100] 2.00 g of palmitic acid and 0.48 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 2.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0101] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0102] All results are shown in Table 1.

[0103] Embodiment 11

[0104] 4.00 g of palmitic acid and 0.95 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 1.0 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0105] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0106] All results are shown in Table 1.

[0107] Example 12

[0108] 4.00 g of palmitic acid and 0.95 g of 2-aminoethanol were added to 100 mL of deionized water, heated to 80° C. for reaction for 30 minutes under continuous stirring, and then 1.5 g of sodium C12-C18 α-olefin sulfonate was added, and the mixture was naturally cooled to room temperature to obtain a foaming liquid. Air was continuously blown into the foaming liquid to form foam, the foam volume was recorded, and the 25% liquid precipitation time of the foam (the time when the mass fraction of liquid precipitation in the foam is 25%) was measured.

[0109] Weigh 10g of organic contaminated soil and place it in a 100ml beaker, and measure the VOCs concentration above the soil using a Mini RAE 3000 VOC detector. Cover the soil with the prepared foam to a height of 15cm, measure the VOCs concentration in the air above the foam, and measure the VOCs concentration in the air above the foam again after 24 hours.

[0110] All results are shown in Table 1.

[0111] Comparative Example 1

[0112] Add 4.00 g of sodium palmitate to 100 mL of deionized water and heat to 80°C, add 2.0 g of sodium C12-C18 α-olefin sulfonate, and cool naturally to room temperature to obtain a paste with extremely high viscosity, close to a solid state, which cannot be foamed.

[0113] Table 1

[0114]

[0115] It can be seen from the above data that the soil remediation composition and the use method thereof provided by the present invention can effectively inhibit the volatilization of VOCs in the soil into the atmosphere.

[0116] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0117] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

Claims

1. A barrier agent composition, characterized in that: include: Component A: foaming agent; Component B: a compound selected from formula (1) and / or formula (2); R4COO(CH2) n NH2 formula (1) R4COO(CH2)2N + (CH3)3 Formula (2) In formula (1) and formula (2), R4 is a C10-C20 straight-chain alkyl group; n is an integer from 2 to 10, preferably an integer from 2 to 6.

2. The barrier composition according to claim 1, wherein Based on the total weight of the barrier composition, the content of component A is 1-10wt%, and the content of component B is 1-10wt%; Preferably, the content of component A is 1-5 wt %, and the content of component B is 2-6 wt %.

3. The barrier composition according to claim 1, wherein The mass ratio of the fatty carboxylic acid part R4COO- in the component B to the component A is 4:(0.5-4), preferably 4:(2-3).

4. The barrier composition according to any one of claims 1 to 3, wherein: The foaming agent is selected from at least one of the compounds represented by formula (3) to formula (5); R1OSO3M1 formula (3) R2O(CH2CH2O)SO3M2 Formula (4) R3SO3M3 formula (5) In formula (3) to formula (5), R1, R2 and R3 are the same or different, and are each independently selected from at least one of a C10-C20 straight chain or branched alkyl group, a C10-C20 alkenyl group, a C10-C20 alkyl-substituted aryl group and a C10-C20 aryl-substituted alkyl group; M1, M2 and M3 are the same or different, and are each independently selected from a monovalent cation.

5. The barrier composition according to claim 4, wherein: R1, R2 and R3 are each independently selected from at least one of a C10-C16 straight or branched alkyl group, a C10-C16 alkenyl group, a C10-C16 alkyl-substituted aryl group and a C10-C16 aryl-substituted alkyl group; preferably, the C10-C16 alkenyl group is a C10-C16 α-alkenyl group; M1, M2 and M3 are each independently selected from at least one of sodium ions, potassium ions and ammonium ions; preferably, M1, M2 and M3 are all sodium ions.

6. The barrier composition according to claim 5, wherein: The component A is selected from at least one of sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium hexadecyl sulfate, sodium dodecylbenzene sulfonate, sodium hexadecylbenzene sulfonate, sodium C12-C18 α-olefin sulfonate and sodium lauryl alcohol polyoxyethylene ether sulfate.

7. A barrier foaming agent, characterized in that: The barrier foaming agent comprises the barrier composition according to any one of claims 1 to 6 and a solvent.

8. The barrier foaming agent according to claim 7, wherein: Based on 100g of the solvent, the content of component A is 1-10g, and the content of component B is 1-10g; Preferably, the solvent is water.

9. The method for preparing the barrier foaming agent according to claim 7 or 8, characterized in that: The steps include: Component B, component A and a solvent are mixed to obtain the barrier foaming agent.

10. The method for preparing the barrier foaming agent according to claim 9, wherein: The preparation method comprises the following steps: Reaction of fatty carboxylic acids with HO(CH2) n NH2 or choline are sequentially added to the solvent, heated to 40-90°C, reacted under stirring conditions, and the obtained reaction product is mixed with component A to obtain the barrier agent; Preferably, relative to 100 g of the solvent, the amount of component A is 1 to 10 g, and the amount of the fatty carboxylic acid is 1 to 10 g.

11. The method for preparing the barrier foaming agent according to claim 10, wherein: The mass ratio of the fatty carboxylic acid to component A is 4:(0.5-4), preferably 4:(2-3); The fatty carboxylic acid is selected from at least one of cinnamic acid, myristic acid, palmitic acid and stearic acid.

12. A soil remediation foam, characterized in that: The soil remediation foam is a foaming product of the barrier foaming agent according to claim 7 or 8; Preferably, the foaming method is at least one of vigorous stirring, ultrasound and bubbling.

13. A method for remediating soil contaminated by volatile organic compounds, characterized in that: The steps include: The soil remediation foam according to claim 12 is applied on the soil contaminated by volatile organic compounds, with a coating thickness of 5 cm to 25 cm.

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