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 modified protein and a foaming agent; wherein the modified protein is obtained through reaction of natural protein and fatty acid succinimide ester, and based on the total weight of the blocking agent composition, the content of the modified protein is 10-99 wt%, and the content of the foaming agent is 1-90 wt%. The barrier foaming agent at least has the following beneficial effects: the barrier foaming agent provided by the invention has good foaming capacity and stability, and can play a role in barrier and repair for a long time; compared with the reported protein foam composition, the protein compound provided by the invention is simple, easy to obtain and low in cost; the components of the barrier foaming agent are 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 contaminated soil remediation sites, 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. Protein compounds, as a natural product, can be used to prepare foams and are environmentally friendly, but the foaming performance and foam stability of protein compounds are poor. Subsequently, many papers reported that the foam produced by using Trichoderma reesei protein has excellent stability, but the separation and purification process of Trichoderma reesei protein is relatively difficult, which limits the large-scale use of this protein compound. Summary of the invention

[0006] 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.

[0007] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a barrier agent composition, comprising a modified protein and a foaming agent; wherein the modified protein is obtained by reacting a natural protein with a fatty acid succinimide ester.

[0008] A second aspect of the present invention provides a barrier foaming agent, the barrier comprising the barrier composition and a solvent.

[0009] The third aspect of the present invention provides a method for preparing the barrier foaming agent, comprising the following steps:

[0010] The modified protein, the foaming agent and the optional thickener are added into the solvent and stirred to dissolve to obtain the barrier foaming agent.

[0011] A fourth aspect of the present invention provides a soil remediation foam, which is a foaming product of the barrier foaming agent.

[0012] A fifth aspect of the present invention provides a method for remediating soil contaminated by volatile organic compounds, comprising the following steps:

[0013] The soil remediation foam is coated on the soil contaminated by volatile organic compounds, with a coating thickness of 5 cm to 25 cm.

[0014] The beneficial effects of the present invention are at least in the following aspects:

[0015] 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.

[0016] Secondly, compared with the reported protein foam compositions, the protein compound in the present invention is simple, easy to obtain and low in cost.

[0017] Thirdly, the barrier foaming agent component in the present invention is green and degradable, has no secondary pollution, and is energy-saving and environmentally friendly.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0019] 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.

[0020] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a barrier agent composition, comprising a modified protein and a foaming agent; wherein the modified protein is obtained by reacting a natural protein with a fatty acid succinimide ester.

[0021] According to the present invention, preferably, based on the total weight of the barrier agent composition, the content of the modified protein is 10-99wt%, preferably 40-85wt%, and the content of the foaming agent is 1-90wt%, preferably 15-60wt%.

[0022] According to the present invention, preferably, the natural protein is selected from at least one of soy protein isolate, rice protein, rapeseed protein, rice bran protein, whey protein, egg albumin, hydrolyzed animal keratin and hydrolyzed animal hair protein.

[0023] According to the present invention, preferably, the structure of the fatty acid succinimide ester is as follows:

[0024]

[0025] In the formula, R is a C10-C20 straight-chain alkyl group, preferably a C12-C18 straight-chain alkyl group.

[0026] According to the present invention, preferably, the fatty carboxylic acid part in the fatty acid succinimide ester is derived from at least one of lauric acid, myristic acid, palmitic acid and stearic acid.

[0027] In the present invention, the fatty acid succinimide ester can be prepared by reacting a fatty carboxylic acid RCOOH with succinimide. Preferably, the fatty carboxylic acid is selected from at least one of lauric acid, myristic acid, palmitic acid and stearic acid.

[0028] According to a specific embodiment of the present invention, a fatty acid succinimide ester is obtained by reacting a fatty acid carboxylic acid RCOOH (A) with succinimide, and then the obtained fatty acid succinimide ester is reacted with a natural protein (B) to obtain a modified protein (C). The specific reaction formula is as follows:

[0029]

[0030] According to the present invention, preferably, the foaming agent is selected from at least one of the compounds represented by formula (1) to formula (3);

[0031] R1OSO3M1 formula (1)

[0032] R2O(CH2CH2O)SO3M2 Formula (2)

[0033] R3SO3M3 formula (3)

[0034] In formula (1) to formula (3), R1, R2 and R3 are the same or different, and are each independently selected from 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 a monovalent cation.

[0035] 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.

[0036] 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.

[0037] According to the present invention, preferably, the foaming agent 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.

[0038] According to the present invention, preferably, the barrier agent composition further comprises a thickener.

[0039] According to the present invention, preferably, based on the total weight of the barrier agent composition, the content of modified protein is 10-98.9wt%, preferably 38-85wt%, the content of foaming agent is 1-89.9wt%, preferably 14-60wt%, and the content of thickener is 0.01-40wt%, preferably 0.7-9wt%.

[0040] According to the present invention, preferably, the thickener is selected from at least one of xanthan gum, sodium alginate, carrageenan, gelatin, guar gum, sodium carboxymethyl cellulose and agar.

[0041] A second aspect of the present invention provides a barrier foaming agent, the barrier comprising the barrier composition and a solvent.

[0042] According to the present invention, preferably, based on the weight of 100g of the solvent, the content of modified protein is 1.0-10.0g, preferably 4.0-8.5g, the content of thickener is 0-0.6g, preferably 0.1-0.5g, and the content of foaming agent is 0.01-8.0g, preferably 1.5-6.0g.

[0043] According to the present invention, preferably, the solvent is water.

[0044] The third aspect of the present invention provides a method for preparing the barrier foaming agent, comprising the following steps:

[0045] According to the present invention, preferably, the modified protein, the foaming agent and the optional thickener are added to a solvent and stirred to dissolve to obtain the barrier foaming agent.

[0046] According to the present invention, preferably, relative to 100g of solvent, the amount of modified protein used is 1.0-10.0g, preferably 4.0-8.5g, the amount of thickener used is 0-0.6g, preferably 0.1-0.5g, and the amount of foaming agent used is 0.01-8.0g, preferably 1.5-6.0g.

[0047] A fourth aspect of the present invention provides a soil remediation foam, which is a foaming product of the barrier foaming agent.

[0048] 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.

[0049] In some preferred embodiments of the present invention, the foaming treatment comprises: blowing gas, preferably air, into the foaming agent.

[0050] A fifth aspect of the present invention provides a method for remediating soil contaminated by volatile organic compounds, comprising the following steps:

[0051] The soil remediation foam is coated on the soil contaminated by volatile organic compounds, with a coating thickness of 5 cm to 25 cm.

[0052] 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.

[0053] 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.

[0054] In the following embodiments, unless otherwise specified, blowing refers to blowing air.

[0055] 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.

[0056] Example 1

[0057] Add 50.0g of lauric acid and 750mL of anhydrous 1,4-dioxane to a three-necked flask, stir to fully dissolve, then add 30.0g of N-hydroxysuccinimide and 80.0g of dicyclohexylcarbodiimide (DCC) in sequence, and continue stirring and reacting for 4 hours under nitrogen protection. After the reaction is completed, stop stirring, add petroleum ether to the reaction mixture, let it stand for 1 hour, then filter, evaporate and concentrate the filtrate to obtain a colorless oily crude product, and then purify the crude product by silica gel column chromatography to obtain 44.0g of colorless N-succinimide-laurate (12C-NHS).

[0058] Weigh 5g of soy protein isolate and add it to 100g of water, and adjust the pH value to 9.0 with 1mol / L NaOH solution. Take 10.0g of N-succinimide-laurate (12C-NHS) and add it to 100mL DMSO, slowly add the resulting solution dropwise to the above-mentioned soy protein isolate suspension at room temperature, and adjust the pH value to 9.0 with 1mol / L NaOH solution again. Stir the reaction for 2 hours and centrifuge, place the supernatant protein solution in a dialysis bag (molecular weight cut-off 3500Da) and dialyze for 48 hours, then freeze-dry to obtain dodecyl-soy protein modified product.

[0059] 5.0 g of modified dodecyl-soy protein, 4.0 g of sodium α-olefin sulfonate and 0.2 g of sodium carboxymethyl cellulose were added to 100 mL of deionized water in sequence and stirred until dissolved 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.

[0060] 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.

[0061] All results are shown in Table 1.

[0062] Example 2

[0063] This example is basically carried out in the manner of Example 1, except that the amount of sodium α-olefin sulfonate used is 2.0 g.

[0064] Example 3

[0065] This example is basically carried out in the manner of Example 1, except that the amount of sodium carboxymethyl cellulose used is 0 g, that is, no sodium carboxymethyl cellulose is added.

[0066] Example 4

[0067] This example is basically carried out in the manner of Example 1, except that xanthan gum is used instead of sodium carboxymethyl cellulose, and the amount of xanthan gum used is 0.1 g.

[0068] Example 5

[0069] This example is basically carried out in the manner of Example 1, except that sodium lauryl sulfate is used instead of sodium α-olefin sulfonate, and the amount of sodium carboxymethyl cellulose used is 0.5 g.

[0070] Example 6

[0071] This example is basically carried out in the manner of Example 1, except that sodium lauryl sulfate is used instead of sodium α-olefin sulfonate, and the amount of sodium lauryl sulfate used is 6 g; the amount of sodium carboxymethyl cellulose used is 0 g, that is, sodium carboxymethyl cellulose is not added.

[0072] Example 7

[0073] Add 70.0g of stearic acid and 750mL of anhydrous 1,4-dioxane to a three-necked flask, stir to fully dissolve, then add 30.0g of N-hydroxysuccinimide and 80.0g of dicyclohexylcarbodiimide (DCC) in sequence, and continue stirring and reacting for 4 hours under nitrogen protection. After the reaction is completed, stop stirring, add petroleum ether to the reaction mixture, let it stand for 1 hour, then filter, evaporate and concentrate the filtrate to obtain a colorless oily crude product, and then purify the crude product by silica gel column chromatography to obtain 51.0g of colorless N-succinimide-stearate (18C-NHS).

[0074] Weigh 20g of hydrolyzed animal keratin and add it to 500g of water, and adjust the pH value to 9.0 with 1mol / L NaOH solution. Take 40.0g of N-succinimide-stearate (18C-NHS) and add it to 100mL DMSO, slowly add the resulting solution dropwise to the above-mentioned soy protein isolate suspension at room temperature, and adjust the pH value to 9.0 with 1mol / L NaOH solution again. Stir the reaction for 2 hours and centrifuge, place the supernatant protein solution in a dialysis bag (molecular weight cut-off 3500Da) and dialyze for 48 hours, then freeze-dry to obtain octadecyl-keratin modified substance.

[0075] 8.0 g of octadecyl-keratin modification, 6.0 g of sodium α-olefin sulfonate and 0.2 g of sodium carboxymethyl cellulose were added to 100 mL of deionized water in sequence, and stirred until dissolved 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.

[0076] 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.

[0077] All results are shown in Table 1.

[0078] Example 8

[0079] This example is basically carried out in the manner of Example 7, except that the amount of sodium α-olefin sulfonate used is 4 g.

[0080] Example 9

[0081] This example is basically carried out in the manner of Example 7, except that the amount of sodium carboxymethyl cellulose used is 0 g, i.e., no sodium carboxymethyl cellulose is added.

[0082] Example 10

[0083] This example is basically carried out in the manner of Example 7, except that xanthan gum is used instead of sodium carboxymethyl cellulose, and the amount of xanthan gum used is 0.1 g.

[0084] Embodiment 11

[0085] This example is basically carried out in the manner of Example 7, except that sodium lauryl sulfate is used instead of sodium α-olefin sulfonate, and carrageenan is used instead of sodium carboxymethyl cellulose. The amounts of sodium lauryl sulfate and carrageenan used are 6.0 g and 0.4 g, respectively.

[0086] Example 12

[0087] This example is basically carried out in the manner of Example 7, except that sodium lauryl sulfate is used instead of sodium α-olefin sulfonate, and the amount of sodium lauryl sulfate used is 6 g; the amount of sodium carboxymethyl cellulose used is 0 g, that is, sodium carboxymethyl cellulose is not added.

[0088] Example 13

[0089] Add 63.0g of palmitic acid and 750mL of anhydrous 1,4-dioxane to a three-necked flask, stir to fully dissolve, then add 30.0g of N-hydroxysuccinimide and 80.0g of dicyclohexylcarbodiimide (DCC) in sequence, and continue stirring and reacting for 4 hours under nitrogen protection. After the reaction is completed, stop stirring, add petroleum ether to the reaction mixture, let it stand for 1 hour, then filter, evaporate and concentrate the filtrate to obtain a colorless oily crude product, and then purify the crude product by silica gel column chromatography to obtain 47.6g of colorless N-succinimide-palmitate (16C-NHS).

[0090] Weigh 10g rice bran protein and join in 200g water, and it is 9.0 to regulate pH value with the NaOH solution of 1mol / L.Get 20.0gN-succinimide-palmitate (16C-NHS) and add among the 100mL DMSO, the solution obtained is slowly added dropwise in the above-mentioned soy protein isolate suspension at room temperature, and it is 9.0 to regulate pH value with the NaOH solution of 1mol / L again.Stirring reaction is centrifugal after 2 hours, and supernatant protein solution is inserted in dialysis bag (molecular weight cut-off 3500Da) and dialyzed 48 hours, and then freeze drying obtains hexadecyl-rice bran protein modification.

[0091] 4.0 g of hexadecyl-rice bran protein modification, 3.0 g of sodium lauryl polyoxyethylene ether sulfate and 0.5 g of gelatin were added to 100 mL of deionized water in sequence, and stirred until dissolved 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.

[0092] 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.

[0093] All results are shown in Table 1.

[0094] Embodiment 14

[0095] Add 57.0g of myristic acid and 750mL of anhydrous 1,4-dioxane to a three-necked flask, stir to fully dissolve, then add 30.0g of N-hydroxysuccinimide and 80.0g of dicyclohexylcarbodiimide (DCC) in sequence, and continue stirring and reacting for 4 hours under nitrogen protection. After the reaction is completed, stop stirring, add petroleum ether to the reaction mixture, let it stand for 1 hour, then filter, evaporate and concentrate the filtrate to obtain a colorless oily crude product, and then purify the crude product by silica gel column chromatography to obtain 47.6g of colorless N-succinimide-myristic acid ester (14C-NHS).

[0096] Weigh 10g of hydrolyzed animal keratin and add it to 200g of water, and adjust the pH value to 9.0 with 1mol / L NaOH solution. Take 20.0g of N-succinimide-myristic acid ester (14C-NHS) and add it to 100mL DMSO, slowly add the resulting solution dropwise to the above-mentioned soy protein isolate suspension at room temperature, and adjust the pH value to 9.0 with 1mol / L NaOH solution again. Stir the reaction for 2 hours and then centrifuge, place the supernatant protein solution in a dialysis bag (molecular weight cut-off 3500Da) and dialyze for 48 hours, then freeze-dry to obtain tetradecyl-keratin modified product.

[0097] 4.0 g tetradecyl-keratin modification and 3.0 g sodium α-olefin sulfonate were added to 100 mL of deionized water, and stirred until dissolved 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.

[0098] 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.

[0099] All results are shown in Table 1.

[0100] Comparative Example 1

[0101] 5.0 g of soy protein isolate, 4.0 g of sodium α-olefin sulfonate and 0.2 g of sodium carboxymethyl cellulose were added to 100 mL of deionized water in sequence, and stirred until dissolved to obtain a foaming liquid.

[0102] 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.

[0103] All results are shown in Table 1.

[0104] Table 1

[0105]

[0106] 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.

[0107] 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.

[0108] 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: The invention comprises modified protein and a foaming agent; wherein the modified protein is obtained by reacting natural protein with fatty acid succinimide ester.

2. The barrier composition according to claim 1, wherein Based on the total weight of the barrier composition, the content of the modified protein is 10-99wt%, and the content of the foaming agent is 1-90wt%; Preferably, based on the total weight of the barrier agent composition, the content of the modified protein is 40-85wt%, and the content of the foaming agent is 15-60wt%.

3. The barrier composition according to claim 1, wherein The natural protein is selected from at least one of soy protein isolate, rice protein, rapeseed protein, rice bran protein, whey protein, egg white protein, hydrolyzed animal keratin and hydrolyzed animal hair protein.

4. The barrier composition according to claim 1, wherein The structure of the fatty acid succinimide ester is as follows: In the formula, R is a C10-C20 straight-chain alkyl group, preferably a C12-C18 straight-chain alkyl group.

5. The barrier composition according to claim 4, wherein: The fatty carboxylic acid portion of the fatty acid succinimide ester is derived from at least one of lauric acid, myristic acid, palmitic acid and stearic acid.

6. The barrier composition according to claim 1, wherein: The foaming agent is selected from at least one of the compounds represented by formula (1) to formula (3); R1OSO3M1 formula (1) R2O(CH2CH2O)SO3M2 Formula (2) R3SO3M3 formula (3) In formula (1) to formula (3), R1, R2 and R3 are the same or different, and are each independently selected from 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 a monovalent cation.

7. The barrier composition according to claim 6, 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.

8. The barrier composition according to claim 7, wherein: The foaming agent 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.

9. The barrier composition according to any one of claims 1 to 8, wherein: The barrier agent composition also includes a thickener; Based on the total weight of the barrier composition, the content of the modified protein is 10-98.9wt%, the content of the foaming agent is 1-89.9wt%, and the content of the thickener is 0.01-40wt%; Preferably, based on the total weight of the barrier agent composition, the content of the modified protein is 38-85wt%, the content of the foaming agent is 14-60wt%, and the content of the thickener is 0.7-9wt%.

10. The barrier composition according to claim 9, wherein: The thickener is selected from at least one of xanthan gum, sodium alginate, carrageenan, gelatin, guar gum, sodium carboxymethyl cellulose and agar.

11. A barrier foaming agent, characterized in that: The barrier agent comprises the barrier agent composition according to any one of claims 1 to 10 and a solvent.

12. The barrier foaming agent according to claim 11, wherein Based on 100 g of the solvent, the content of the modified protein is 1.0-10.0 g, the content of the thickener is 0-0.6 g, and the content of the foaming agent is 0.01-8.0 g; Preferably, relative to 100g of solvent, the content of modified protein is 4.0-8.5g, the content of thickener is 0.1-0.5g, and the content of foaming agent is 1.5-6.0g; Preferably, the solvent is water.

13. The method for preparing the barrier foaming agent according to claim 11 or 12, characterized in that: The steps include: Adding modified protein, foaming agent and optional thickener into a solvent, stirring and dissolving, to obtain the barrier foaming agent; Preferably, relative to 100g of solvent, the amount of modified protein is 1.0-10.0g, the amount of thickener is 0-0.6g, and the amount of foaming agent is 0.01-8.0g; More preferably, relative to 100 g of solvent, the amount of modified protein used is 4.0 to 8.5 g, the amount of thickener used is 0.1 to 0.5 g, and the amount of foaming agent used is 1.5 to 6.0 g.

14. A soil remediation foam, characterized in that: The soil remediation foam is a foamed product of the barrier foaming agent according to claim 11 or 12; Preferably, the foaming method is at least one of vigorous stirring, ultrasound and bubbling.

15. A method for remediating soil contaminated by volatile organic compounds, characterized in that: The steps include: The soil remediation foam described in claim 14 is applied on the soil contaminated by volatile organic compounds, with a coating thickness of 5 cm to 25 cm.

Images