CN115044380A - Phenanthrene-polluted soil remediation agent and preparation method thereof - Google Patents
Phenanthrene-polluted soil remediation agent and preparation method thereof Download PDFInfo
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- CN115044380A CN115044380A CN202210660295.XA CN202210660295A CN115044380A CN 115044380 A CN115044380 A CN 115044380A CN 202210660295 A CN202210660295 A CN 202210660295A CN 115044380 A CN115044380 A CN 115044380A
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- phenanthrene
- remediation agent
- soil remediation
- contaminated soil
- citric acid
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- 239000002689 soil Substances 0.000 title claims abstract description 90
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 51
- 238000005067 remediation Methods 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 claims abstract description 102
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 87
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 32
- 238000002386 leaching Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 17
- 229920002678 cellulose Polymers 0.000 claims abstract description 17
- 239000001913 cellulose Substances 0.000 claims abstract description 17
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 16
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical group NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 16
- 239000011790 ferrous sulphate Substances 0.000 claims description 16
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 16
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 16
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000003900 soil pollution Methods 0.000 abstract description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 12
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000000967 suction filtration Methods 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910017135 Fe—O Inorganic materials 0.000 description 1
- 229910018663 Mn O Inorganic materials 0.000 description 1
- 229910003176 Mn-O Inorganic materials 0.000 description 1
- -1 Persulfate ions Chemical class 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100001239 persistent pollutant Toxicity 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
Abstract
The invention discloses a phenanthrene contaminated soil remediation agent and a preparation method thereof, and belongs to the technical field of soil pollution treatment. The phenanthrene-contaminated soil remediation agent comprises the following components: citric acid, persulfate, soluble ferrous salt, nano-cellulose and water. Dissolving citric acid, persulfate and soluble ferrous salt in water, adding nano cellulose, and stirring to obtain the phenanthrene contaminated soil remediation agent. Preparing a phenanthrene-polluted soil remediation agent, and removing phenanthrene in the phenanthrene-polluted soil in a leaching manner. The phenanthrene-polluted soil remediation agent provided by the invention can be used for thoroughly removing phenanthrene in phenanthrene-polluted soil, and meanwhile, leaching liquor is not required to be recycled, so that the cost of soil pollution treatment is saved. The formula provided by the invention has the advantages of easily available raw materials, simple preparation steps and good application and popularization values. The nano-cellulose and the citric acid used in the invention are degradable environment-friendly materials, are environment-friendly and do not produce secondary pollution.
Description
Technical Field
The invention relates to the technical field of soil pollution treatment, in particular to a phenanthrene polluted soil remediation agent and a preparation method thereof.
Background
Polycyclic aromatic hydrocarbons refer to compounds in which more than two benzene rings are connected together, such as naphthalene, anthracene and the like, and are hydrocarbon compounds with strong inertia, and the compounds are relatively stable due to the strong inertia and can be widely present in the environment, water and soil.
Polycyclic aromatic hydrocarbons are not easily dissolved in water and are easily attached to solid particles, so that persistent pollutants are formed in the environment. The presence of polycyclic aromatic hydrocarbons in soil may pollute surface water through leaching, and then transmit toxicity to aquatic organisms, or polycyclic aromatic hydrocarbon-polluted soil poses a great threat to human health through direct contact or indirect biological accumulation.
Phenanthrene is a tricyclic polycyclic aromatic hydrocarbon and is a persistent organic pollutant with higher detection rate in the environment, so that an effective method for cleaning soil polluted by phenanthrene is urgently needed in the field.
Disclosure of Invention
The invention aims to provide a phenanthrene-polluted soil remediation agent and a preparation method thereof. Citric acid, persulfate, soluble ferrous salt and nanocellulose are compounded and dispersed in water to prepare the phenanthrene-polluted soil remediation agent, and phenanthrene in the phenanthrene-polluted soil is removed in a leaching manner. The formula provided by the invention has the advantages of easily available raw materials, simple preparation steps and good application and popularization values.
In order to achieve the purpose, the invention provides the following technical scheme:
one of the technical schemes of the invention is as follows: provides a phenanthrene contaminated soil remediation agent, which comprises the following components: citric acid, persulfate, soluble ferrous salt, nano-cellulose and water.
Preferably, the mass ratio of the citric acid to the persulfate to the soluble ferrous salt to the nano-cellulose to the water is (2-20): 1-3): 0.17-0.51): 40: 2000.
More preferably, the mass ratio of the citric acid to the persulfate to the soluble ferrous salt to the nanocellulose to the water is 10:2:0.34:40: 2000.
Preferably, the persulfate is sodium persulfate.
Preferably, the soluble ferrous salt is ferrous sulfate.
Preferably, the length of the nano-cellulose is 3-100 nm.
The second technical scheme of the invention is as follows: provides a preparation method of the phenanthrene-contaminated soil remediation agent, which comprises the following steps: dissolving citric acid, persulfate and soluble ferrous salt in water, adding nano cellulose, and stirring to obtain the phenanthrene contaminated soil remediation agent.
Preferably, the stirring speed is 500-1000 rpm, and the time is 30-50 min.
The third technical scheme of the invention is as follows: provides the application of the phenanthrene-polluted soil remediation agent in remediation of phenanthrene-polluted soil.
Preferably, the phenanthrene-contaminated soil remediation agent removes phenanthrene in the phenanthrene-contaminated soil in a leaching manner, wherein the dosage of the phenanthrene-contaminated soil remediation agent is 10 times of the quality of the phenanthrene-contaminated soil, and the method comprises the following specific steps: mixing the phenanthrene-contaminated soil with 1/2-mass phenanthrene-contaminated soil remediation agent, stirring and leaching for 24h under a heating condition, adding the remaining phenanthrene-contaminated soil remediation agent after solid-liquid separation, repeatedly leaching once under the same condition, and performing solid-liquid separation to finish remediation of the phenanthrene-contaminated soil.
More preferably, the heating condition is heating the mixture to 50 ℃.
The nano-cellulose selected by the invention is a nano-scale material, has small size and large surface area, and the surface energy of the nano-cellulose is increased because the hydroxyl on the surface of the nano-cellulose is lack of atom coordination adjacent to the hydroxyl, and the nano-cellulose is very unstable, is very easy to combine with other atoms and shows higher activity. When the method is applied to the phenanthrene-polluted soil, phenanthrene is combined with metal/minerals in the soil, and high-activity hydroxyl on the surface of the nanocellulose can be combined with Fe-O, Si-O and Mn-O in the soil, so that phenanthrene is desorbed and migrates to a water phase by interrupting phenanthrene-metal/mineral bonds, and the aim of removing phenanthrene is fulfilled.
The citric acid added in the invention is an effective organic ligand, and hydroxyl and carboxyl in molecules can be combined with metal ions in soil to form a soluble metal complex, so that the desorption of phenanthrene is promoted by competition with phenanthrene. Meanwhile, the added citric acid can act synergistically with the nano-cellulose to change the adsorption/desorption balance of phenanthrene in soil, so that phenanthrene is desorbed more thoroughly, and a better phenanthrene removal effect is achieved.
Persulfate ions and ferrous ions are obtained after persulfate and soluble ferrous salt added in the invention are dissolved in water, and peroxy groups in persulfate radicals have strong oxidizing property, so that phenanthrene desorbed can be catalyzed and oxidized under the catalysis of ferrous ions, and degraded into small organic molecules, thereby achieving the purpose of thoroughly removing the phenanthrene. The method overcomes the defect that the leaching agent needs to be recycled after the soil is repaired by the conventional soil leaching repairing agent.
The invention has the following beneficial technical effects:
according to the invention, citric acid, persulfate, soluble ferrous salt and nanocellulose are compounded and dispersed in water to prepare the phenanthrene-polluted soil remediation agent, and phenanthrene in the phenanthrene-polluted soil is removed in a leaching manner. The obtained phenanthrene-polluted soil restoration agent can thoroughly remove phenanthrene in phenanthrene-polluted soil, meanwhile, leaching liquor is not required to be recycled, the consumption of persulfate and soluble ferrous salt in the phenanthrene-polluted soil restoration agent can be supplemented, the phenanthrene-polluted soil restoration agent is recycled, and the cost for treating phenanthrene-polluted soil is greatly saved.
The formula provided by the invention has the advantages of easily available raw materials, simple preparation steps and good application and popularization values.
The nano-cellulose and the citric acid used in the invention are degradable environment-friendly materials, are environment-friendly and do not produce secondary pollution.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every intervening value, to the extent any stated value or intervening value in a stated range, and any other stated or intervening value in a stated range, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including but not limited to.
The nano-cellulose, the citric acid, the sodium persulfate and the ferrous sulfate used in the embodiment of the invention are all commercial varieties, the length of the nano-cellulose is 3-100 nm, the citric acid, the sodium persulfate and the ferrous sulfate are all industrial grade, and the purity is more than or equal to 99%; the water used was clean tap water.
Example 1
Preparing a phenanthrene-polluted soil remediation agent:
adding 10 parts of citric acid, 2 parts of sodium persulfate and 0.34 part of ferrous sulfate into 2000 parts of water, fully dissolving, adding 40 parts of nano-cellulose, and stirring at the stirring speed of 800rpm for 40min to prepare the phenanthrene contaminated soil remediation agent.
Example 2
Preparing a phenanthrene-polluted soil remediation agent:
adding 20 parts of citric acid, 2 parts of sodium persulfate and 0.34 part of ferrous sulfate into 2000 parts of water, fully dissolving, adding 40 parts of nano-cellulose, and stirring at a stirring speed of 500rpm for 50min to prepare the phenanthrene contaminated soil remediation agent.
Example 3
Preparing a phenanthrene-polluted soil remediation agent:
adding 2 parts of citric acid, 2 parts of sodium persulfate and 0.34 part of ferrous sulfate into 2000 parts of water, fully dissolving, adding 40 parts of nano cellulose, and stirring at the stirring speed of 1000rpm for 30min to prepare the phenanthrene contaminated soil remediation agent.
Example 4
Preparing a phenanthrene-polluted soil remediation agent:
adding 10 parts of citric acid, 3 parts of sodium persulfate and 0.51 part of ferrous sulfate into 2000 parts of water, fully dissolving, adding 40 parts of nano-cellulose, and stirring at the stirring speed of 800rpm for 40min to prepare the phenanthrene contaminated soil remediation agent.
Example 5
Preparing a phenanthrene-polluted soil remediation agent:
adding 10 parts of citric acid, 1 part of sodium persulfate and 0.17 part of ferrous sulfate into 2000 parts of water, fully dissolving, adding 40 parts of nano cellulose, and stirring at the stirring speed of 800rpm for 40min to prepare the phenanthrene contaminated soil remediation agent.
The phenanthrene-contaminated soil remediation agent prepared in the embodiment 1-5 is used for remediating phenanthrene-contaminated soil:
(1) taking the soil from which stones and impurities with the size of more than 2cm are removed, adding phenanthrene dissolved in dichloromethane to enable the phenanthrene content in the soil to be 100mg/kg, violently oscillating for 30min after the addition is finished, completely volatilizing dichloromethane in a fume hood, and then aging for 15 days at room temperature to obtain phenanthrene-contaminated soil;
(2) respectively taking 20g of the phenanthrene-contaminated soil prepared in the step (1), respectively adding 100g of the phenanthrene-contaminated soil remediation agent prepared in the examples 1-5, heating to 50 ℃, stirring and leaching for 24h, performing suction filtration, adding 100g of the phenanthrene-contaminated soil remediation agent prepared in the examples 1-5 into the precipitate, repeating the previous leaching step, collecting leacheate twice, and determining the total amount of phenanthrene in the leacheate, wherein the results are shown in Table 1;
(3) and (3) extracting the residual phenanthrene in the phenanthrene-polluted soil subjected to the washing in the step (2) by using dichloromethane, measuring after the extraction is finished, and converting into the phenanthrene content in the phenanthrene-polluted soil, wherein the result is shown in table 1.
And (3) comparison test:
taking 20g of the phenanthrene-contaminated soil prepared in the phenanthrene-contaminated soil remediation test step (1), adding 100g of citric acid, sodium persulfate and ferrous sulfate aqueous solution (the mass ratio of the citric acid, the sodium persulfate and the ferrous sulfate to the water is 20:2:0.34:2000), heating to 50 ℃, leaching for 24 hours, adding 100g of sodium persulfate, ferrous sulfate and nanocellulose aqueous dispersion into the precipitate after suction filtration (the preparation method is the same as that in example 1, wherein the mass ratio of the sodium persulfate, the ferrous sulfate and the nanocellulose to the water is 2:0.34:80:2000), repeating the previous leaching step, carrying out suction filtration, combining leachates obtained by carrying out suction filtration twice, and measuring the total amount of phenanthrene in the leachates, wherein the results are shown in Table 1; and (3) extracting the residual phenanthrene in the precipitate obtained by suction filtration by using dichloromethane, measuring after the extraction is finished, and converting into the phenanthrene content in the phenanthrene-polluted soil, wherein the result is shown in table 1.
TABLE 1 phenanthrene content and phenanthrene degradation rate before and after restoration of phenanthrene-contaminated soil
Remarking: the phenanthrene degradation rate (%) (phenanthrene content in phenanthrene-contaminated soil-phenanthrene content in repaired phenanthrene-contaminated soil-total amount of phenanthrene in leacheate/20 x 1000)/phenanthrene content in phenanthrene-contaminated soil 100%).
As can be seen from the table 1, the phenanthrene-contaminated soil remediation agent prepared by the method can effectively leach phenanthrene in phenanthrene-contaminated soil, and has a good degradation rate while leaching. Comparing the data of examples 1-5, it can be seen that the leaching and degradation effects on phenanthrene are best when the mass ratio of citric acid, sodium persulfate, ferrous sulfate, nanocellulose and water disclosed in example 1 is 10:2:0.34:40: 2000; the addition of citric acid is too high, which has little influence on the leaching of phenanthrene, and the addition of too little is not beneficial to the leaching of phenanthrene (examples 1, 2 and 3); the addition of sodium persulfate and ferrous sulfate is too low to be beneficial to the degradation of phenanthrene, and the addition of sodium persulfate and ferrous sulfate is too high to inhibit the degradation of phenanthrene (examples 1, 4 and 5); compared with the simultaneous addition of citric acid and nanocellulose, when the two substances are separately used for leaching the phenanthrene-polluted soil, the leaching effect is obviously weakened, and the simultaneous addition of citric acid and nanocellulose in the invention has a synergistic effect on the leaching of phenanthrene.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The phenanthrene-contaminated soil remediation agent is characterized by comprising the following components: citric acid, persulfate, soluble ferrous salt, nano-cellulose and water.
2. The phenanthrene-contaminated soil remediation agent of claim 1, wherein the mass ratio of the citric acid to the persulfate to the soluble ferrous salt to the nanocellulose to water is (2-20): 1-3): 0.17-0.51): 40: 2000.
3. The phenanthrene-contaminated soil remediation agent of claim 2, wherein the mass ratio of citric acid, persulfate, soluble ferrous salt, nanocellulose and water is 10:2:0.34:40: 2000.
4. The phenanthrene-contaminated soil remediation agent of claim 1, wherein said persulfate is sodium persulfate.
5. The phenanthrene-contaminated soil remediation agent of claim 1, wherein said soluble ferrous salt is ferrous sulfate.
6. The phenanthrene-contaminated soil remediation agent of claim 1, wherein the nanocellulose has a length of 3-100 nm.
7. The preparation method of the phenanthrene-contaminated soil remediation agent according to any one of claims 1 to 6, comprising the following steps: dissolving citric acid, persulfate and soluble ferrous salt in water, adding nano cellulose, and stirring to obtain the phenanthrene contaminated soil remediation agent.
8. The method according to claim 7, wherein the stirring speed is 500 to 1000rpm and the time is 30 to 50 min.
9. The use of the phenanthrene-contaminated soil remediation agent of any one of claims 1 to 6 for remediation of phenanthrene-contaminated soil.
10. The use of claim 9, wherein the phenanthrene-contaminated soil remediation agent removes phenanthrene from phenanthrene-contaminated soil in a leaching manner, wherein the amount of the phenanthrene-contaminated soil remediation agent is 10 times the mass of the phenanthrene-contaminated soil, and the method comprises the following specific steps: mixing the phenanthrene-polluted soil with 1/2-mass phenanthrene-polluted soil remediation agent, stirring and leaching for 24h under a heating condition, adding the remaining phenanthrene-polluted soil remediation agent after solid-liquid separation, repeatedly leaching once under the same condition, and performing solid-liquid separation to finish the remediation of the phenanthrene-polluted soil.
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Application publication date: 20220913 |