CN108865153B - Calcium peroxide nano microcapsule soil remediation agent and preparation method and application thereof - Google Patents
Calcium peroxide nano microcapsule soil remediation agent and preparation method and application thereof Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 70
- 239000004343 Calcium peroxide Substances 0.000 title claims abstract description 44
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 235000019402 calcium peroxide Nutrition 0.000 title claims abstract description 44
- 239000003094 microcapsule Substances 0.000 title claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 25
- 238000005067 remediation Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims description 15
- 229920001661 Chitosan Polymers 0.000 claims abstract description 39
- 239000004021 humic acid Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 26
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011575 calcium Substances 0.000 claims abstract description 15
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 15
- 239000002114 nanocomposite Substances 0.000 claims abstract description 15
- 239000001110 calcium chloride Substances 0.000 claims abstract description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 3
- 239000011259 mixed solution Substances 0.000 claims description 37
- 239000000243 solution Substances 0.000 claims description 27
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 10
- 229960000583 acetic acid Drugs 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 claims description 10
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 8
- 239000003209 petroleum derivative Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 239000012362 glacial acetic acid Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 claims description 2
- 239000012046 mixed solvent Substances 0.000 claims description 2
- 239000010413 mother solution Substances 0.000 claims description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 235000015097 nutrients Nutrition 0.000 description 4
- 239000002088 nanocapsule Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000011162 core material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000012154 double-distilled water Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
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- 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
- B09C1/08—Reclamation of contaminated soil chemically
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Cosmetics (AREA)
Abstract
The invention discloses a calcium peroxide nano microcapsule soil remediation agent, which belongs to the field of chemical remediation of organic contaminated sites, and comprises calcium peroxide, humic acid and chitosan, wherein the calcium peroxide is CaCl2、H2O2The calcium peroxide-humic acid nano composite material is prepared from 5-9 parts of calcium peroxide, 1 part of humic acid, 5-10 parts of chitosan and 100-200 nm of calcium peroxide-humic acid nano composite material particle size. The method has the advantages of simple process, simple and convenient operation, mild reaction, low energy consumption and no generation of harmful wastes.
Description
Technical Field
The invention belongs to the field of chemical remediation of organic contaminated sites, and particularly relates to a calcium peroxide nano microcapsule soil remediation agent, and a preparation method and application thereof.
Background
With the acceleration of the urbanization process of China, a large number of enterprises such as petroleum, chemical engineering, coking and the like have been moved and transferred from urban areas, and a large number of industrial left-over organic pollution sites are formed. Because the organic pollutants have the characteristics of high toxicity, easy diffusion and the like, the organic pollution sites seriously threaten the surrounding environmental conditions, the physical health of residents and the reutilization of land, and the rapid and efficient measures for treatment are urgently needed. Among methods for removing organic pollutants from soil, the in-situ chemical oxidation method is widely applied because of its advantages of relatively low repair cost, quick repair effect, simple operation, etc. However, the traditional soil remediation agent is not ideal in degradation efficiency of organic pollutants, has great influence on soil nutrients and physicochemical properties, and is easy to cause secondary pollution.
Calcium peroxide is an environment-friendly material with nutrient release and oxidation properties, molecular oxygen and hydrogen peroxide are released by reaction with water in the soil environment, and the hydrogen peroxide can be catalyzed by iron minerals in the soil to generate hydroxyl radicals, so that organic pollutants are degraded. Therefore, compared with the traditional soil remediation agent, the calcium peroxide has wider pH adaptation range, no toxicity and short half-life of the product reduced by the calcium peroxide, and is an oxidant very suitable for chemical remediation of organic contaminated soil.
Humic acid is a high molecular polymer widely existing in nature, is a main body of soil organic matters, contains various active functional groups such as carboxylic acid groups, phenolic hydroxyl groups and the like, can adsorb organic pollutants through hydrophobic effect, coordination exchange and hydrogen bond effect, and has certain degradation capability on the adsorbed organic pollutants. Therefore, the humic acid has great significance for removing soil organic pollutants and maintaining soil nutrients, and has wide application prospect in the field of chemical remediation of organic contaminated sites.
The microcapsules are prepared for the following reasons. First, the core material is kept in a good dispersion state and migration ability in the soil. Second, the active ingredient is released as needed. And thirdly, the micro-morphology and the performance of the repairing agent are improved to a certain extent. In recent years, microcapsule technology is continuously developed, and due to the unique performance of the microcapsule, the microcapsule is widely applied to various fields such as environmental protection, pesticides and medicine, and particularly in the soil remediation industry, the potential of the microcapsule technology is continuously shown.
The invention discloses a calcium peroxide nano microcapsule soil remediation agent, which is characterized in that nano calcium peroxide particles with strong oxidizing property are uniformly embedded in humic acid with adsorbability to prepare a calcium peroxide-humic acid nano composite material, the calcium peroxide-humic acid nano composite material is taken as a core material, chitosan is taken as a wall material, and the calcium peroxide nano microcapsule soil remediation agent is successfully synthesized; the repairing agent keeps the strong oxidizing property of calcium peroxide and the adsorbability of humic acid, and improves the degradation efficiency of organic pollutants; the repairing agent can overcome the defects that the traditional calcium peroxide has low repairing efficiency and too large particle size, is not easy to disperse in the soil environment and has great influence on soil nutrients.
Disclosure of Invention
The technical task of the invention is to provide a calcium peroxide nano microcapsule soil remediation agent and a preparation method and application thereof aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a calcium peroxide nanometer microcapsule soil remediation agent, and its preparation method and application, wherein the soil remediation agent comprises calcium peroxide, humic acid, and chitosan, the calcium peroxide is prepared from CaCl2、H2O25-9 parts of calcium peroxide, 1 part of humic acid, 5-10 parts of chitosan and 100-200 nm of calcium peroxide-humic acid nano composite particle size.
Further improvement: the weight of the calcium peroxide, the humic acid and the chitosan is 5-7: 1: 8-10.
Further improvement: 1.5-3.5 g of calcium peroxide, 0.3-0.5 g of humic acid and 2.4-5.0 g of chitosan.
A preparation method of a calcium peroxide nano microcapsule soil remediation agent comprises the following steps: preparing a calcium peroxide-humic acid nano composite material with the particle size of 100-200 nm by a chemical coprecipitation method according to the proportion of claim 1, preparing a chitosan solution, and dissolving 2.4-5.0 g of chitosan in 40-60 mL of acetic acid solution;
the second step is that: weighing 1.8-4.0 g of the prepared calcium peroxide-humic acid nanocomposite, dissolving in 10-20 mL of glacial acetic acid to prepare a mixed solution, extracting the mixed solution by using a needle tube, and slowly dropping the mixed solution into the prepared chitosan solution.
In the first step, 1.5-4.5 g of CaCl is firstly added2Dissolving the mixture into 30-60 mL of a mixed solvent of double distilled water and ammonia water with the volume ratio of 1-3: 1, and then dropwise adding 30% of H2O210-20 mL, continuously stirring for 40-60 min, then dropwise adding a NaOH solution to adjust the pH value to 10-12, then rapidly dropwise adding 0.3-0.5 g of humic acid solution, placing the mixed solution at room temperature, continuously stirring for 20-40 min, finally placing the mixed solution into a centrifuge tube, placing the centrifuge tube into a centrifuge, washing the centrifuge tube for 2-4 times by using a large amount of deionized water until the mixed solution is neutral, finally placing the centrifuge tube into a drying box for drying, grinding the centrifuge tube into powder, sieving the powder, and placing the powder into a bag for later use.
And in the second step, during the dripping of the chitosan solution, continuously stirring and slowly dripping NaOH solution to maintain the pH =10, allowing the formed chitosan material to stay in the mother solution for 20-24 hours, then placing the chitosan material in a centrifuge tube, putting the centrifuge tube into a centrifuge, washing the chitosan material for 2-4 times by using a large amount of deionized water until the chitosan material is neutral, finally drying the composite microcapsule in a freeze dryer for 20-24 hours, grinding the composite microcapsule into powder, and sieving the powder to obtain the product.
The application of the calcium peroxide nano microcapsule soil remediation agent is characterized in that: application in degrading polycyclic aromatic hydrocarbon, trichloroethylene and petroleum hydrocarbon in soil.
The invention has the advantages that: the preparation method provided by the invention is based on the prior art, the degradation performance, the adsorption performance and the dispersion performance of the repairing agent are further optimized, the microcapsule repairing agent based on the calcium peroxide-humic acid nano composite material can be further synthesized in situ, and the capsule wall material is the environment-friendly natural organic chitosan. The method has the advantages of simple process, simple and convenient operation, mild reaction, low energy consumption and no generation of harmful wastes.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1 preparation of calcium peroxide-humic acid nanocomposite
Adding 3.0g of CaCl2Dissolved in 50mL of a solvent with a volume ratio of 1: 2, then dropping 30% of H2O215mL, continuously stirring for 50min, then dropwise adding a NaOH solution to adjust the pH value to 11, then quickly dropwise adding 0.4g of humic acid solution, placing the mixed solution at room temperature, continuously stirring for 30min, finally placing the mixed solution into a centrifuge tube, washing the mixed solution for 3 times by using a large amount of deionized water until the mixed solution is neutral, finally placing the mixed solution into a drying box, drying the dried mixed solution, grinding the dried mixed solution into powder, sieving the powder, and placing the powder into a bag for later use.
Example 2 preparation of calcium peroxide-humic acid nanocomposite
Adding 4.0g of CaCl2Dissolving in 60mL of a solvent with the volume ratio of 1:3, then dropping 30% of H2O220mL, continuously stirring for 60min, then dropwise adding a NaOH solution to adjust the pH value to 11.5, then quickly dropwise adding 0.5g of humic acid solution, placing the mixed solution at room temperature, continuously stirring for 30min, finally placing the mixed solution into a centrifuge tube, washing the mixed solution for 3 times by using a large amount of deionized water until the mixed solution is neutral, finally placing the mixed solution into a drying box, drying the dried mixed solution, grinding the dried mixed solution into powder, sieving the powder, and placing the powder into a bag for later use.
EXAMPLE 3 preparation of calcium peroxide nanocapsules
Preparing 2% (w/v) chitosan solution, namely dissolving 2.1g of chitosan in 50mL of 1% acetic acid solution (mixing 36% acetic acid and water according to the mass ratio of 1: 35), stirring for 2h under the condition of mechanical stirring, then weighing 2.4g of prepared calcium peroxide-humic acid nanocomposite and dissolving in 10mL of glacial acetic acid to prepare mixed solution, drawing out the mixed solution by using a needle tube, slowly dropping the prepared chitosan solution, and continuously stirring and slowly dropping NaOH solution during the period to maintain the pH =10. And (3) the formed chitosan material stays in the mother liquor for 24 hours, then the chitosan material is placed in a centrifuge tube and is placed in a centrifuge, a large amount of deionized water is used for washing for 3 times until the chitosan material is neutral, finally the composite microcapsule is dried in a freeze dryer for 24 hours, ground into powder and sieved, and the product is obtained.
EXAMPLE 4 preparation of calcium peroxide nanocapsules
Preparing a 3% (w/v) chitosan solution, namely dissolving 2.5g of chitosan in 60mL of 1% acetic acid solution (mixing 36% acetic acid and water according to a mass ratio of 1: 35), stirring for 2.5h under a mechanical stirring condition, then weighing 3.6g of the prepared calcium peroxide-humic acid nanocomposite and dissolving in 15mL of glacial acetic acid to prepare a mixed solution, drawing the mixed solution by using a needle tube, slowly dropping the prepared chitosan solution, and continuously stirring and slowly dropping NaOH solution during the period to maintain the pH = 10.5. And (3) the formed chitosan material stays in the mother liquor for 24 hours, then the chitosan material is placed in a centrifuge tube and is placed in a centrifuge, a large amount of deionized water is used for washing for 3 times until the chitosan material is neutral, finally the composite microcapsule is dried in a freeze dryer for 24 hours, ground into powder and sieved, and the product is obtained.
Example 5 degradation of polycyclic aromatic hydrocarbons, trichloroethylene and Petroleum hydrocarbons by calcium peroxide Nannocapsules
(1) Weighing 10g of polluted soil with the polycyclic aromatic hydrocarbon content of 50mg/kg, putting the polluted soil into a 250mL conical flask, adding 40mL of deionized water to prepare a slurry-state soil mixed solution, enabling the soil liquid-solid mass ratio to be 4:1, adding 0.4g of calcium peroxide nano microcapsule, fully stirring, standing for 24h, extracting the polycyclic aromatic hydrocarbon residual in the soil by an ultrasonic method, and carrying out quantitative detection and analysis on the result by using a liquid chromatograph, wherein the polycyclic aromatic hydrocarbon removal rate in the soil reaches 80%;
(2) weighing 10g of polluted soil with 50mg/kg of trichloroethylene, putting the polluted soil into a 250mL conical flask, adding 40mL of deionized water to prepare a slurry-state soil mixed solution, enabling the soil to have a liquid-solid mass ratio of 4:1, adding 0.4g of calcium peroxide nano microcapsule, fully stirring, standing for 24h, extracting the residual trichloroethylene in the soil by using an ultrasonic method, and carrying out quantitative detection and analysis on the result by using a liquid chromatograph, wherein the trichloroethylene removal rate in the soil reaches 90%;
(3) weighing 10g of contaminated soil with the petroleum hydrocarbon content of 50mg/kg, putting the contaminated soil into a 250mL conical flask, adding 40mL of deionized water to prepare a slurry soil mixed solution, enabling the soil liquid-solid mass ratio to be 4:1, adding 0.4g of calcium peroxide nano microcapsule, fully stirring, standing for 24h, extracting the residual petroleum hydrocarbon in the soil by using an ultrasonic method, and carrying out quantitative detection and analysis on the result by using a liquid chromatograph, wherein the removal rate of the petroleum hydrocarbon in the soil reaches 85%.
Example 6 degradation of polycyclic aromatic hydrocarbons, trichloroethylene and petroleum hydrocarbons by calcium peroxide nanocapsules
(1) Weighing 10g of polluted soil with the polycyclic aromatic hydrocarbon content of 50mg/kg, putting the polluted soil into a 250mL conical flask, adding 50mL of deionized water to prepare a slurry-state soil mixed solution, enabling the soil liquid-solid mass ratio to be 5:1, adding 0.5g of calcium peroxide nano microcapsule, fully stirring, standing for 24h, extracting the polycyclic aromatic hydrocarbon residual in the soil by an ultrasonic method, and carrying out quantitative detection and analysis on the result by using a liquid chromatograph, wherein the polycyclic aromatic hydrocarbon removal rate in the soil reaches 85%;
(2) weighing 10g of polluted soil with 50mg/kg of trichloroethylene, putting the polluted soil into a 250mL conical flask, adding 50mL of deionized water to prepare a slurry-state soil mixed solution, enabling the soil to have a liquid-solid mass ratio of 5:1, adding 0.5g of calcium peroxide nano microcapsule, fully stirring, standing for 24h, extracting the residual trichloroethylene in the soil by using an ultrasonic method, and carrying out quantitative detection and analysis on the result by using a liquid chromatograph, wherein the trichloroethylene removal rate in the soil reaches 94%;
(3) weighing 10g of contaminated soil with the petroleum hydrocarbon content of 50mg/kg, putting the contaminated soil into a 250mL conical flask, adding 50mL of deionized water to prepare a slurry soil mixed solution, enabling the soil to have a liquid-solid mass ratio of 5:1, adding 0.5g of calcium peroxide nano microcapsule, fully stirring, standing for 24h, extracting the residual petroleum hydrocarbon in the soil by using an ultrasonic method, and quantitatively detecting and analyzing the result by using a liquid chromatograph, wherein the removal rate of the petroleum hydrocarbon in the soil reaches 90%.
Claims (4)
1. A preparation method of a calcium peroxide nano microcapsule soil remediation agent is characterized by comprising the following steps: the calcium peroxide nano microcapsule soil remediation agent consists of calcium peroxide, humic acid and chitosan, wherein the calcium peroxide is CaCl2、H2O25-9 parts of calcium peroxide, 1 part of humic acid and 5-10 parts of chitosan;
the preparation method of the calcium peroxide nano microcapsule soil remediation agent comprises the following steps:
the first step is as follows: adding 1.5-4.5 g of CaCl2Dissolving in 30-60 mL of bis (phenol-bis-phenol) with a volume ratio of 1-3: 1Distilled water and ammonia water mixed solvent, then 30% of H is dripped2O210-20 mL, continuously stirring for 40-60 min, then dropping NaOH solution to adjust the pH value to 10-12, then quickly dropping 0.3-0.5 g of humic acid solution, placing the mixed solution at room temperature, continuously stirring for 20-40 min, finally placing the mixed solution into a centrifuge tube, washing the mixed solution for 2-4 times by using a large amount of deionized water until the mixed solution is neutral, finally placing the mixed solution into a drying box for drying, grinding the dried solution into powder, sieving the powder to obtain a calcium peroxide-humic acid nano composite material with the particle size of 100-200 nm, placing the calcium peroxide-humic acid nano composite material into a bag for later use, then preparing chitosan solution, and dissolving 2.4-5.0 g of chitosan into 40-60 mL of acetic acid solution;
the second step is that: weighing 1.8-4.0 g of the prepared calcium peroxide-humic acid nano composite material, dissolving in 10-20 mL of glacial acetic acid to prepare a mixed solution, extracting the mixed solution by using a needle tube, and slowly dripping the prepared chitosan solution to obtain a composite microcapsule;
and in the second step, during the dripping of the chitosan solution, continuously stirring and slowly dripping NaOH solution to maintain the pH =10, allowing the formed chitosan material to stay in the mother solution for 20-24 hours, then placing the chitosan material in a centrifuge tube, putting the centrifuge tube into a centrifuge, washing the chitosan material for 2-4 times by using a large amount of deionized water until the chitosan material is neutral, finally drying the composite microcapsule in a freeze dryer for 20-24 hours, grinding the composite microcapsule into powder, and sieving the powder to obtain the product.
2. The preparation method of the calcium peroxide nano microcapsule soil remediation agent as claimed in claim 1, wherein the soil remediation agent comprises: the weight ratio of the calcium peroxide to the humic acid to the chitosan is 5-7: 1: 8-10.
3. A calcium peroxide nano microcapsule soil remediation agent prepared by the preparation method of any one of claims 1-2.
4. The use of the calcium peroxide nano microcapsule soil remediation agent as claimed in claim 3, wherein: application in degrading polycyclic aromatic hydrocarbon, trichloroethylene and petroleum hydrocarbon in soil.
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| CN110846046A (en) * | 2019-11-28 | 2020-02-28 | 浙江海洋大学 | Composite repairing agent for organic contaminated soil, preparation method and application thereof |
| CN112316893B (en) * | 2020-10-22 | 2023-07-07 | 华东理工大学 | Preparation method and application of bentonite composite material for adsorbing and degrading site peculiar smell substances |
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Effective date of registration: 20231228 Address after: Room 604, Building 7, China Resources Land Plaza, Maoling No.2 Road, Lixia District, Jinan City, Shandong Province, 250014 Patentee after: Shandong Chulan Environmental Protection Technology Co.,Ltd. Address before: 250022 No. 336, South Xin Zhuang West Road, Shizhong District, Ji'nan, Shandong Patentee before: University of Jinan |