CN114289490A - Carbon-fixing material for repairing heavy metal polluted farmland - Google Patents
Carbon-fixing material for repairing heavy metal polluted farmland Download PDFInfo
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- CN114289490A CN114289490A CN202111567499.0A CN202111567499A CN114289490A CN 114289490 A CN114289490 A CN 114289490A CN 202111567499 A CN202111567499 A CN 202111567499A CN 114289490 A CN114289490 A CN 114289490A
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- 239000000463 material Substances 0.000 title claims abstract description 67
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002689 soil Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 29
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 25
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 25
- 229940043430 calcium compound Drugs 0.000 claims abstract description 23
- 150000001674 calcium compounds Chemical class 0.000 claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 22
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 21
- 239000011575 calcium Substances 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 21
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000005067 remediation Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 6
- 229910000000 metal hydroxide Inorganic materials 0.000 claims abstract description 6
- 150000004692 metal hydroxides Chemical class 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 239000010902 straw Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 230000009919 sequestration Effects 0.000 claims description 14
- 238000000197 pyrolysis Methods 0.000 claims description 11
- 238000007605 air drying Methods 0.000 claims description 7
- 238000003763 carbonization Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 238000005232 molecular self-assembly Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 9
- 239000001569 carbon dioxide Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 150000002500 ions Chemical class 0.000 abstract description 6
- 229910052793 cadmium Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 235000013339 cereals Nutrition 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000003971 tillage Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002688 soil aggregate Substances 0.000 description 1
- 239000004016 soil organic matter Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Abstract
The invention discloses a carbon-fixing material for repairing heavy metal polluted farmland, and relates to the technical field of soil remediation. The carbon fixing material comprises the following components: calcium compounds, ferric sulfate and biochar; the calcium compound is calcium oxide or calcium hydroxide; the preparation process of the carbon-fixing material is as follows: mixing the mixture of calcium compound and ferric sulfate with water, heating to 80-85 ℃, and stirring at high speed for 4-6 hours to obtain calcium and iron layered double metal hydroxide slurry; preparing biochar; and uniformly mixing the prepared biochar with the calcium and iron layered double metal hydroxide slurry to prepare the carbon fixing material. The invention has the advantages that: the carbon-fixing material can passivate heavy metal ions in polluted cultivated land, can fix organic carbon in soil, can absorb a large amount of carbon dioxide in air, and has better carbon-fixing and carbon-reducing effects.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a carbon sequestration material for remediation of heavy metal contaminated farmland.
Background
Arable land occupies 1/3 parts of the surface area of the earth, and the agricultural soil carbon reservoir is most affected by human activities and can be adjusted on a shorter time scale. The organic carbon storage capacity and carbon sequestration capacity of agricultural soil are important bases for evaluating the potential of slowing down climate change and carbon sequestration and emission reduction. Soil carbon sequestration is an important route to cut carbon emissions, achieve carbon neutralization, and mitigate global climate change. 60% of carbon in the soil carbon reservoir exists in soil in the form of organic matters, and the huge soil carbon storage amount is CO in the atmosphere2The level of (c) has a significant effect.
Compared with natural vegetation, the organic carbon content of soil is obviously reduced by 51.7-58.1% due to farmland planting, and the organic carbon reserve of 20 cm on the surface layer of farmland soil is respectively reduced by 51.6% and 44.8% compared with that of forest land and grassland, because the turnover of unstable granular organic matters is obviously accelerated by agricultural cultivation, the formation of stable organic carbon components is reduced, and the organic carbon reservoir of soil is obviously reduced; farmland soil plowing destroys soil aggregate structures, increases organic matter decomposition, and increases wind and water erosion, resulting in carbon emission as a greenhouse gas from exposed and eroded soil. The loss amount of CO2 in plowing is 13.8 times of that in no-tillage, even if a protective tillage machine is adopted, the loss amount of CO2 is 4.3 times of that in no-tillage, and the key practice of minimizing soil disturbance and continuously covering crop stubble is protective agriculture.
In the prior art, the soil organic matter is usually increased by adopting biochar, so that the methane emission of a rice field and the comprehensive greenhouse effect are reduced, and the carbon fixing and carbon reducing effects are achieved.
Disclosure of Invention
The invention aims to provide a carbon-fixing material for repairing heavy metal polluted cultivated land, which can solve the problems that only the use of biochar can reduce the emission of greenhouse gas, can not passivate heavy metal ions in the polluted cultivated land, can not absorb carbon dioxide in the air and has limited carbon-fixing and carbon-reducing effects in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: the carbon fixing material comprises the following components: calcium compounds, ferric sulfate and biochar;
the mass ratio of the calcium compound to the ferric sulfate is 1.5-2.5: 1;
the calcium compound is calcium oxide or calcium hydroxide;
the preparation process of the carbon fixing material is as follows:
s1, mixing the mixture of the calcium compound and the ferric sulfate with water, wherein the mass ratio of the mixture of the calcium compound and the ferric sulfate to the water is 1: 4-5;
s2, mixing the mixture of the calcium compound and ferric sulfate with water, heating to 80-85 ℃, and stirring at high speed for 4-6 hours to obtain calcium and iron layered double metal hydroxide slurry;
s3, preparing biochar;
s4, uniformly mixing the prepared biochar with the calcium and iron layered double hydroxide slurry to prepare the carbon fixing material, wherein the mass ratio of the biochar to the calcium and iron layered double hydroxide slurry is 1: 2-3.
Further, in the step S2 of preparing the carbon-fixing material, a mixture of a calcium compound and ferric sulfate is mixed with water and stirred, and a supermolecular template method and a molecular self-assembly method are adopted to control the growth of crystal nuclei through an atomic economic reaction, so as to prepare a calcium-iron layered double metal hydroxide slurry.
Further, in the step S3 of preparing the carbon sequestration material, the step of preparing the biochar is as follows:
a. crushing crop straws into 3-5cm, and then air-drying until the water content is 13-14% to obtain air-dried straws;
b. crushing the air-dried straws, and putting the crushed air-dried straws into a carbonization furnace for pyrolysis;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
Further, in the step b for preparing the biochar, the pyrolysis conditions are as follows: under the protection of nitrogen, the temperature is 600-700 ℃, the pyrolysis time is 100-120 minutes, and the nitrogen flow is 200 ml/min.
The use steps of the carbon-fixing material for repairing the heavy metal polluted farmland are as follows:
A. according to the content of heavy metals in the polluted farmland, uniformly spraying the carbon-fixing material on the surface layer of the soil according to the addition of 400-600 kilograms per mu;
B. and (4) ploughing the soil sprayed with the carbon-fixing material, fully mixing the carbon-fixing material and the soil, planting crops, and performing conventional management.
The invention has the advantages that: the carbon-fixing material provided by the invention has a large number of unsaturated coordination bonds, can coordinate with anions, forms a very stable ternary metal mineralizer under the action of chemical bonds, and can be mineralized with heavy metals in soil and carbon dioxide in air in a humid environment to generate a carbonate type ternary metal mineral, so that heavy metal ions in polluted cultivated land can be passivated, organic carbon in soil can be retained, a large amount of carbon dioxide in air can be absorbed, carbon neutralization is realized, the purpose of carbon fixing and carbon reduction is achieved, and the carbon-fixing and carbon reduction method is an effective way for carbon fixing and carbon reduction of agricultural soil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments. The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
The specific implementation mode adopts the following technical scheme: the carbon fixing material comprises the following components: calcium compounds, ferric sulfate and biochar; the mass ratio of the calcium compound to the ferric sulfate is 1.5-2.5: 1; the calcium compound is calcium oxide or calcium hydroxide.
The preparation process of the carbon-fixing material is as follows:
and S1, mixing the mixture of the calcium compound and the ferric sulfate with water, wherein the mass ratio of the mixture of the calcium compound and the ferric sulfate to the water is 1: 4-5.
S2, mixing the mixture of the calcium compound and ferric sulfate with water, heating to 80-85 ℃, stirring at high speed for 4-6 hours, adopting a supermolecular template method and a molecular self-assembly method, and controlling the growth of crystal nuclei through atomic economic reaction to prepare the calcium and iron layered double metal hydroxide slurry.
S3, preparing biochar:
a. crushing crop straws into 3-5cm, and then air-drying until the water content is 13-14% to obtain air-dried straws;
b. crushing the air-dried straws, placing the crushed air-dried straws in a carbonization furnace, and carrying out pyrolysis for 120 minutes at the temperature of 600-700 ℃ under the protection of nitrogen, wherein the flow rate of the nitrogen is 200 ml/min;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
S4, uniformly mixing the prepared biochar with the calcium and iron layered double hydroxide slurry to prepare the carbon fixing material, wherein the mass ratio of the biochar to the calcium and iron layered double hydroxide slurry is 1: 2-3.
The use steps of the carbon-fixing material for repairing the heavy metal polluted farmland are as follows:
A. according to the content of heavy metals in the polluted farmland, uniformly spraying the carbon-fixing material on the surface layer of the soil according to the addition of 400-600 kilograms per mu;
B. and (4) ploughing the soil sprayed with the carbon-fixing material, fully mixing the carbon-fixing material and the soil, planting crops, and performing conventional management.
Example 1:
the preparation process of the carbon-fixing material is as follows:
and S1, mixing the calcium oxide and the ferric sulfate according to the mass ratio of 1.5:1, and mixing the mixture and water, wherein the mass ratio of the mixture to the water is 1:4.
And S2, mixing the mixture of calcium oxide and ferric sulfate with water, heating to 80 ℃, stirring at high speed for 6 hours, and controlling the growth of crystal nuclei by adopting a supermolecular template method and a molecular self-assembly method through an atom economic reaction to prepare the layered double hydroxide slurry of calcium and iron.
S3, preparing biochar:
a. crushing crop straws into 3cm, and then air-drying until the water content is 13% to obtain air-dried straws;
b. crushing air-dried straws, placing the crushed air-dried straws in a carbonization furnace, and carrying out pyrolysis for 120 minutes at the temperature of 600 ℃ under the protection of nitrogen, wherein the flow rate of the nitrogen is 200 ml/min;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
S4, uniformly mixing the prepared biochar with the calcium and iron layered double hydroxide slurry to prepare the carbon fixing material, wherein the mass ratio of the biochar to the calcium and iron layered double hydroxide slurry is 1:2.
The use steps of the carbon-fixing material for repairing the heavy metal polluted farmland are as follows:
A. according to the content of heavy metals in the polluted farmland, uniformly spraying the carbon-fixing material on the surface layer of the soil according to the addition of 400 kilograms per mu;
B. and (4) ploughing the soil sprayed with the carbon-fixing material, fully mixing the carbon-fixing material and the soil, planting crops, and performing conventional management.
Example 2:
the preparation process of the carbon-fixing material is as follows:
s1, mixing calcium hydroxide and ferric sulfate according to the mass ratio of 2.5:1, and mixing the mixture with water, wherein the mass ratio of the mixture to the water is 1: 5;
s2, mixing the mixture of calcium hydroxide and ferric sulfate with water, heating to 85 ℃, stirring at high speed for 4 hours, adopting a supermolecular template method and a molecular self-assembly method, and controlling the growth of crystal nuclei through atom economic reaction to prepare the layered double hydroxide slurry of calcium and iron.
S3, preparing biochar:
a. crushing crop straws into 5cm, and then air-drying until the water content is 14% to obtain air-dried straws;
b. crushing air-dried straws, placing the crushed air-dried straws in a carbonization furnace, and under the protection of nitrogen, wherein the temperature is 700 ℃, the pyrolysis time is 100 minutes, and the nitrogen flow is 200 ml/min;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
S4, uniformly mixing the prepared biochar with the calcium and iron layered double hydroxide slurry to prepare the carbon fixing material, wherein the mass ratio of the biochar to the calcium and iron layered double hydroxide slurry is 1: 3.
The use steps of the carbon-fixing material for repairing the heavy metal polluted farmland are as follows:
A. according to the content of heavy metals in the polluted farmland, uniformly spraying the carbon-fixing material on the surface layer of the soil according to the addition amount of 600 kilograms per mu;
B. and (4) ploughing the soil sprayed with the carbon-fixing material, fully mixing the carbon-fixing material and the soil, planting crops, and performing conventional management.
Example 3:
the preparation process of the carbon-fixing material is as follows:
s1, mixing calcium oxide and ferric sulfate according to the mass ratio of 2:1, and mixing the mixture with water, wherein the mass ratio of the mixture to the water is 1: 4.5;
s2, mixing the mixture of calcium oxide and ferric sulfate with water, heating to 82 ℃, stirring at high speed for 5 hours, adopting a supermolecular template method and a molecular self-assembly method, and controlling the growth of crystal nuclei through atom economic reaction to prepare the layered double hydroxide slurry of calcium and iron.
S3, preparing biochar:
a. crushing crop straws into 4cm, and then air-drying until the water content is 13.5% to obtain air-dried straws;
b. crushing air-dried straws, placing the crushed air-dried straws in a carbonization furnace, and under the protection of nitrogen, wherein the temperature is 650 ℃, the pyrolysis time is 110 minutes, and the nitrogen flow is 200 ml/min;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
S4, uniformly mixing the prepared biochar with the calcium and iron layered double hydroxide slurry to prepare the carbon fixing material, wherein the mass ratio of the biochar to the calcium and iron layered double hydroxide slurry is 1: 2.5.
The use steps of the carbon-fixing material for repairing the heavy metal polluted farmland are as follows:
A. according to the content of heavy metals in the polluted farmland, uniformly spraying the carbon-fixing material on the surface layer of the soil according to the addition of 500 kilograms per mu;
B. and (4) ploughing the soil sprayed with the carbon-fixing material, fully mixing the carbon-fixing material and the soil, planting crops, and performing conventional management.
After the carbon sequestration materials of the embodiments 1-3 are used in the polluted cultivated land, the carbon sequestration materials are mineralized and reacted with heavy metals in the soil and carbon dioxide in the air in a humid environment to generate carbonate type ternary metal minerals, so that heavy metal ions in the polluted cultivated land can be passivated, and the pH value, the organic carbon content and the change of Cd and Cd in water grains in the polluted cultivated land are shown in Table 1.
Table 1: the carbon-fixing materials of examples 1-3 were used in the contaminated cultivated land after the contaminated cultivated land was contaminated, the pH value, the organic carbon content and the comparison of Cd and Cd in water seed with the unused carbon-fixing materials
As can be seen from table 1, after the carbon sequestration material is used in the contaminated cultivated land, the PH value in the contaminated cultivated land tends to be neutral, the soil acidity is reduced, the organic carbon content is significantly increased, and the Cd-Cd content in the water grains is significantly reduced, so that not only can heavy metal ions in the contaminated cultivated land be passivated, but also organic carbon in the soil can be retained, and a large amount of carbon dioxide in the air can be absorbed, thereby realizing carbon neutralization and achieving the purpose of carbon sequestration and carbon reduction, wherein example 3 is the best example.
Comparative example 1:
the carbon fixing material is biochar, and the preparation process comprises the following steps:
a. crushing crop straws into 4cm, and then air-drying until the water content is 13.5% to obtain air-dried straws;
b. crushing air-dried straws, placing the crushed air-dried straws in a carbonization furnace, and under the protection of nitrogen, wherein the temperature is 650 ℃, the pyrolysis time is 110 minutes, and the nitrogen flow is 200 ml/min;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
The application method of the carbon-fixing material for repairing the heavy metal polluted farmland is the same as the step of the embodiment 3.
After the carbon-fixing material of the comparative example 1 is used in the polluted cultivated land, the pH value in the polluted cultivated land has no obvious change, the content of organic carbon is increased from 49.20g/kg to 75.56g/kg, and the content of Cd and Cd in water grains has no obvious change.
Comparing the data of examples 1-3 with the data of comparative example 1, it can be found that the carbon-fixing material of examples 1-3 can passivate heavy metal ions in the polluted farmland, can also retain organic carbon in the soil, can also absorb a large amount of carbon dioxide in the air, and has better carbon-fixing and carbon-reducing effects.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A carbon-fixing material for repairing heavy metal polluted farmland is characterized in that: the carbon fixing material comprises the following components: calcium compounds, ferric sulfate and biochar;
the mass ratio of the calcium compound to the ferric sulfate is 1.5-2.5: 1;
the calcium compound is calcium oxide or calcium hydroxide;
the preparation process of the carbon fixing material is as follows:
s1, mixing the mixture of the calcium compound and the ferric sulfate with water, wherein the mass ratio of the mixture of the calcium compound and the ferric sulfate to the water is 1: 4-5;
s2, mixing the mixture of the calcium compound and ferric sulfate with water, heating to 80-85 ℃, and stirring at high speed for 4-6 hours to obtain calcium and iron layered double metal hydroxide slurry;
s3, preparing biochar;
s4, uniformly mixing the prepared biochar with the calcium and iron layered double hydroxide slurry to prepare the carbon fixing material, wherein the mass ratio of the biochar to the calcium and iron layered double hydroxide slurry is 1: 2-3.
2. The carbon sequestration material for heavy metal contaminated farmland remediation according to claim 1, characterized in that: in the step S2 of preparing the carbon-fixing material, a mixture of a calcium compound and ferric sulfate is mixed with water and stirred, and a supermolecular template method and a molecular self-assembly method are adopted to control the growth of crystal nuclei through an atomic economic reaction, so as to prepare a layered double hydroxide slurry of calcium and iron.
3. The carbon sequestration material for heavy metal contaminated farmland remediation according to claim 1, characterized in that: in the step S3 of preparing the carbon sequestration material, the step of preparing the biochar is as follows:
a. crushing crop straws into 3-5cm, and then air-drying until the water content is 13-14% to obtain air-dried straws;
b. crushing the air-dried straws, and putting the crushed air-dried straws into a carbonization furnace for pyrolysis;
c. cooling to room temperature, and grinding through a 1mm sieve to obtain the biochar.
4. The carbon sequestration material for heavy metal contaminated farmland remediation according to claim 3, characterized in that: in the step b for preparing the biochar, the pyrolysis conditions are as follows: under the protection of nitrogen, the temperature is 600-700 ℃, the pyrolysis time is 100-120 minutes, and the nitrogen flow is 200 ml/min.
5. The carbon sequestration material for heavy metal contaminated farmland remediation according to claim 1, characterized in that: the carbon fixing material comprises the following use steps:
according to the content of heavy metals in the polluted farmland, uniformly spraying the carbon-fixing material on the surface layer of the soil according to the addition of 400-600 kilograms per mu;
and (4) ploughing the soil sprayed with the carbon-fixing material, fully mixing the carbon-fixing material and the soil, planting crops, and performing conventional management.
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| CN116969601A (en) * | 2023-08-01 | 2023-10-31 | 上海师范大学 | Method and device for fixing carbon in farmland tail water circulation |
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| CN115305091A (en) * | 2022-08-31 | 2022-11-08 | 江苏隆昌化工有限公司 | Repair material for synchronously and long-acting passivation of multiple heavy metals and preparation method thereof |
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