CN114149806A - Soil heavy metal passivator and preparation method and application thereof - Google Patents
Soil heavy metal passivator and preparation method and application thereof Download PDFInfo
- Publication number
- CN114149806A CN114149806A CN202111591452.8A CN202111591452A CN114149806A CN 114149806 A CN114149806 A CN 114149806A CN 202111591452 A CN202111591452 A CN 202111591452A CN 114149806 A CN114149806 A CN 114149806A
- Authority
- CN
- China
- Prior art keywords
- heavy metal
- soil
- parts
- metal passivator
- soil heavy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 94
- 239000002689 soil Substances 0.000 title claims abstract description 85
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000008635 plant growth Effects 0.000 claims abstract description 4
- 150000004715 keto acids Chemical class 0.000 claims abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000002028 Biomass Substances 0.000 claims description 12
- 239000003895 organic fertilizer Substances 0.000 claims description 10
- 239000003610 charcoal Substances 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000005067 remediation Methods 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004327 boric acid Substances 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 235000013399 edible fruits Nutrition 0.000 claims description 5
- 239000005416 organic matter Substances 0.000 claims description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims 1
- 239000012190 activator Substances 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 29
- 238000012360 testing method Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 19
- 235000010149 Brassica rapa subsp chinensis Nutrition 0.000 description 16
- 244000221633 Brassica rapa subsp chinensis Species 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 13
- 229910052745 lead Inorganic materials 0.000 description 13
- 229910052725 zinc Inorganic materials 0.000 description 13
- 230000008859 change Effects 0.000 description 8
- 244000060011 Cocos nucifera Species 0.000 description 7
- 235000013162 Cocos nucifera Nutrition 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 244000144730 Amygdalus persica Species 0.000 description 4
- 244000018633 Prunus armeniaca Species 0.000 description 4
- 235000009827 Prunus armeniaca Nutrition 0.000 description 4
- 235000006040 Prunus persica var persica Nutrition 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000000967 suction filtration Methods 0.000 description 4
- OYPRJOBELJOOCE-IGMARMGPSA-N Calcium-40 Chemical group [40Ca] OYPRJOBELJOOCE-IGMARMGPSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000010998 test method 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/06—Calcium compounds, e.g. lime
-
- 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
-
- 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
- C09K2101/00—Agricultural use
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of resources and environment, and particularly relates to a soil heavy metal passivator, and a preparation method and application thereof. The passivator is prepared from the following raw materials in parts by weight: 40-50 parts of modified biochar and 10-20 parts of an activator; the modified biochar is obtained by mixing biochar with an oxoacid solution, reacting for 80-120min at 75-95 ℃, and filtering. The passivator has the capability of repairing heavy metal contaminated soil, can improve the content of organic matters in the soil, and promotes the growth of plants.
Description
Technical Field
The invention belongs to the technical field of resources and environment, and particularly relates to a soil heavy metal passivator, and a preparation method and application thereof.
Background
In the industrial and agricultural production development process, heavy metals enter soil through ways such as atmospheric sedimentation, sewage irrigation, application of chemical fertilizers and pesticides, regulations of solid wastes and the like, and finally the problem of serious heavy metal pollution of the soil is caused. In recent years, soil heavy metal pollution has become one of the important factors threatening the surrounding ecological environment and affecting human health. Because heavy metals have the characteristics of difficult degradation, easy migration and high toxicity, the heavy metals can enter surrounding water bodies in a leaching and erosion mode under natural conditions, and can enter plants, animals and even human beings through food chains through the absorption of plants. Therefore, it is urgent to find a method for rapidly and effectively reducing heavy metals in soil.
At present, the soil heavy metal pollution remediation method has physical, chemical, biological and combined remediation technologies, but the traditional remediation method has the defects of high cost, unsatisfactory remediation effect and the like. Compared with other repairing materials, the biochar has the advantages of wide source, large specific surface area, high porosity, rich oxygen-containing functional groups and the like, the existing form of heavy metal can be changed through physical and chemical modes such as surface pore adsorption, ion exchange and soil pH change, the migration and bioavailability of the heavy metal in the soil are reduced, and the aim of repairing the heavy metal pollution of the soil is finally achieved. However, practice proves that although raw biochar preparation raw materials are wide, the adsorption effects of the raw biochar on heavy metals are greatly different, and modification methods such as physical, chemical and biological methods are required to improve the adsorption performance of the biochar. How to improve the performance of the biochar by changing the property of the biochar so as to more effectively change the existing form of heavy metal in soil and improve the remediation capability of the soil polluted by the heavy metal becomes a hot problem of related researches.
Disclosure of Invention
In view of the technical problems, the invention provides the soil heavy metal passivator taking the modified biomass charcoal as the main raw material, which not only has the capability of repairing heavy metal contaminated soil, but also has the advantages of improving the content of organic matters in the soil and promoting the growth of plants.
The soil heavy metal passivator provided by the invention is prepared from the following raw materials in parts by weight: 40-50 parts of modified biochar and 10-20 parts of activating agent;
the active agent is one or more of sodium carbonate, sodium hydroxide, potassium carbonate, potassium hydroxide, calcium hydroxide and calcium carbonate;
the modified biochar is prepared by the following method: mixing biomass charcoal with 0.5-2% of oxoacid solution by mass percent in a proportion of 5-10%, reacting for 80-120min at 75-95 ℃, and filtering to obtain the product; wherein the mass ratio of the biomass charcoal to the oxygen-containing acid solution is 5-10: 90-95.
Preferably, the oxygen-containing acid solution is a boric acid solution or a phosphoric acid solution.
Preferably, the biomass charcoal is selected from fruit shells, wood or crop straw.
The invention provides application of the soil heavy metal passivator in repairing heavy metal contaminated soil.
The soil heavy metal passivator provided by the invention further comprises 30-50 parts of organic matters by weight.
Preferably, the organic matter is a bio-organic fertilizer or an organic fertilizer.
The invention also provides a preparation method of the soil heavy metal passivator, which comprises the following steps:
weighing the modified biochar, the organic matter and the activating agent according to the parts by weight, and mixing to obtain the organic biochar.
On the other hand, the invention provides the application of the soil heavy metal passivator in repairing heavy metal contaminated soil and promoting plant growth.
Preferably, when the soil heavy metal passivator is used, the mass ratio of soil to the passivator is 1: 0.5-10.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the soil heavy metal passivator provided by the invention, a large number of oxygen-containing acidic surface groups are introduced into the surface of biomass carbon treated by oxyacid, the acid groups such as carboxyl and phenolic hydroxyl are increased, the number of carbonyl groups is reduced, the specific surface area is increased, the adsorption on cations is enhanced, and the adsorption and passivation effects on heavy metals are improved; meanwhile, the activating agent can obviously promote the adsorption and passivation of the modified biomass carbon on heavy metals, convert the unstable, easily-migrated and biotoxic heavy metal form into a more stable heavy metal form, reduce the effective state of the heavy metals, and realize the passivation of the heavy metals in the soil, thereby reducing the harm of the heavy metals in the soil and having a repairing effect on various heavy metal polluted soils.
2. The soil heavy metal passivator provided by the invention has the combined action of organic matters and modified biomass charcoal, can further improve the soil quality, increase the soil fertility, provide organic matters for crops, promote the growth of the crops and realize the yield increase effect.
3. Compared with the existing organic heavy metal passivator, the soil heavy metal passivator taking the modified biomass charcoal as the raw material is not easy to biodegrade, has stable fixing effect on heavy metals in soil, and can provide reliable guarantee for the stability and the long-term effect of soil heavy metal pollution remediation.
4. The raw materials for preparing the modified biomass charcoal used by the invention can be selected from various shells such as peach shells, apricot shells, coconut shells and the like, wood materials and crop straws, and the sources are wide and easy to obtain.
5. The soil heavy metal passivator provided by the invention is simple in preparation process, low in cost and capable of being produced in a large scale.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the content of the present invention is not limited to the following examples.
Example 1
A soil heavy metal passivator is prepared according to the following steps:
mixing coconut shell activated carbon and boric acid solution with the mass fraction of 0.5% at the temperature of 95 ℃ in a mass ratio of 1: 19, mixing, putting into a constant-temperature oscillator, reacting for 120min, cooling, performing suction filtration, and naturally drying to obtain modified coconut shell activated carbon;
and (2) fully mixing 40 parts by weight of dried modified coconut shell activated carbon with 5 parts by weight of calcium carbonate, 5 parts by weight of calcium hydroxide and 50 parts by weight of organic fertilizer to obtain the soil heavy metal passivator.
Example 2
A soil heavy metal passivator is prepared according to the following steps:
mixing coconut shell activated carbon and boric acid solution with the mass fraction of 0.5% at the temperature of 75 ℃ in a mass ratio of 7: 93 mixing, putting into a constant temperature oscillator, reacting for 80min, cooling, suction filtering, and naturally drying to obtain modified coconut shell activated carbon;
and (2) fully mixing 50 parts by weight of the dried modified coconut shell activated carbon with 5 parts by weight of sodium carbonate, 5 parts by weight of calcium hydroxide and 40 parts by weight of organic fertilizer to obtain the soil heavy metal passivator to be prepared.
Example 3
A soil heavy metal passivator is prepared according to the following steps:
mixing active carbon of a fruit shell (mixing apricot shells and peach shells in any proportion) and boric acid solution with the mass fraction of 0.5% at the temperature of 85 ℃ in a mass ratio of 1: 9, mixing, putting into a constant-temperature oscillator, reacting for 100min, cooling, performing suction filtration, and naturally drying to obtain modified shell activated carbon;
and (3) fully mixing 40 parts by weight of the dried modified shell activated carbon with 5 parts by weight of calcium carbonate, 5 parts by weight of sodium hydroxide and 30 parts by weight of organic fertilizer to obtain the soil heavy metal passivator to be prepared.
Example 4
A soil heavy metal passivator is prepared according to the following steps:
mixing active carbon of a fruit shell (mixing apricot shells and peach shells in any proportion) and boric acid solution with the mass fraction of 2% at the temperature of 90 ℃ in a mass ratio of 1: 19, mixing, putting into a constant temperature oscillator, reacting for 120min, cooling, performing suction filtration, and naturally drying to obtain modified shell activated carbon;
and (2) fully mixing 50 parts by weight of the dried modified shell activated carbon with 10 parts by weight of calcium carbonate, 10 parts by weight of sodium hydroxide and 40 parts by weight of organic fertilizer to obtain the soil heavy metal passivator to be prepared.
Example 5
A soil heavy metal passivator is prepared according to the following steps:
mixing active carbon of a fruit shell (mixing apricot shells and peach shells in any proportion) and phosphoric acid solution with the mass fraction of 1.5% at the temperature of 90 ℃ in a mass ratio of 1: 19, mixing, putting into a constant temperature oscillator, reacting for 120min, cooling, performing suction filtration, and naturally drying to obtain modified shell activated carbon;
and (2) fully mixing 50 parts by weight of the dried modified shell activated carbon with 10 parts by weight of calcium carbonate, 10 parts by weight of sodium hydroxide and 40 parts by weight of organic fertilizer to obtain the soil heavy metal passivator to be prepared.
Comparative example 1
The soil additive is prepared by the following steps: and (3) fully mixing 5 parts of calcium carbonate, 5 parts of calcium hydroxide and 50 parts of organic fertilizer to obtain a product of a comparative example 1.
Comparative example 2
The soil additive is prepared by the following steps: and (3) fully mixing 50 parts of biochar, 5 parts of calcium carbonate, 5 parts of calcium hydroxide and 40 parts of organic fertilizer to obtain a product of a comparative example 2.
Examples of Effect test
The soil heavy metal passivators prepared in the above examples 1-5 and comparative examples are applied to passivation of heavy metals Pb and Zn in soil.
The specific test method is as follows:
the method is characterized in that the polluted soil is obtained from the local area in Yulien county in Kaifeng city in Henan province, the pH of the soil is 5.98, the contents of heavy metals Pb and Zn are 773mg/kg and 546mg/kg respectively, and the contents exceed the limit value of national three-level soil environment quality standard (heavy metal content).
The soil was used as a test soil, pakchoi was used as a test crop, and the products provided in examples 1 to 5 and comparative examples 1 to 2 were used as test reagents to perform a potting test.
Table 1 shows the experimental design of the potting experiment. Wherein CK is a blank control, CK is a number from 1 to 2 to 3 are application tests of a comparative example, CK is a number from 3 to 1 to 7 to 3 are respectively 3 application gradient pot culture tests of 5 soil heavy metal passivator products provided in examples 1 to 5, 8 groups of pot culture tests are provided in total, and 3 times of each group are repeated except the blank tests.
TABLE 1 design of the experiments
The specific operation method comprises the following steps:
in addition to the blank test, six pot test of the 1 st group and the 2 nd group are applied to the soil of each pot test group, the products of the comparative example 1 and the comparative example 2 are applied to the soil of each pot test group, 15 pot test group soils of the 3 rd group and the 7 th group are applied to the soil heavy metal passivator in the examples 3 to 7, the soil is transferred into a pot, the management is carried out under the unified condition after the pakchoi is planted, the fertilizer water application refers to the actual farmland operation, and after the pakchoi is mature, the yield (fresh weight) of the pakchoi, the content of the heavy metal in the pakchoi and the change of the effective state of the heavy metal in the soil are measured. The results are shown in Table 2.
TABLE 2 change in yield (fresh weight) and heavy metal content of pakchoi in different test groups
As can be seen from Table 2, the test groups numbered 1-1, 1-2, 1-3 added the product of comparative example 1, and the application effect thereof had a certain effect on the increase in the yield of pakchoi but had no effect on the reduction in the absorption of heavy metals by pakchoi. The product of comparative example 2 was added to test groups numbered 2-1, 2-2, and 2-3, and the application effect thereof had a certain effect on the increase in the yield of pakchoi and a certain effect on the effective reduction of the absorption of heavy metals Pb and Zn in pakchoi. In 3-1-7-3 groups of experiments, the fresh weight of the pakchoi is increased along with the increase of the application amount of the heavy metal passivator, and thus the heavy metal passivator provided by each group of the embodiment has a certain yield increase effect on the pakchoi. In addition, as can be seen from the change of the contents of heavy metals Pb and Zn in the pakchoi, the contents of the heavy metals Pb and Zn in the pakchoi are obviously reduced along with the increase of the application amount of the metal passivator, and the reduction range of the contents of the heavy metals Pb and Zn is increased along with the increase of the addition amount of the heavy metal passivator. Therefore, the heavy metal passivator prepared by each group in the embodiment can effectively reduce the absorption effect of the pakchoi on the heavy metals Pb and Zn.
The change of the effective state of heavy metals in the soil of the pakchoi planted in each test group is shown in table 3.
TABLE 3 effective state change of heavy metals in soil of different test groups
As can be seen from Table 3, the test groups numbered 1-1, 1-2, 1-3 added the product of comparative example 1, and the effect of application thereof had little effect on lowering the available state of heavy metals Pb and Zn in the soil. The products of comparative example 2, whose application effect had a smaller effect on reducing the effective state of the heavy metals Pb and Zn in the soil, were added to the test groups numbered 2-1, 2-2, 2-3. In 3-1-7-3 groups of experiments, the addition of the heavy metal passivator obviously reduces the effective states of heavy metals Pb and Zn in the soil, and the reduction range of the effective state contents of the heavy metals Pb and Zn in the soil is increased along with the increase of the addition amount of the heavy metal passivator. Therefore, the heavy metal passivator prepared by each group of the embodiments can obviously reduce the effective state content of heavy metals Pb and Zn in soil, thereby reducing the harm of the heavy metals Pb and Zn in the soil.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. The soil heavy metal passivator is characterized by comprising the following raw materials in parts by weight: 40-50 parts of modified biochar and 10-20 parts of activating agent;
the activating agent is one or more of sodium carbonate, sodium hydroxide, potassium carbonate, potassium hydroxide, calcium hydroxide and calcium carbonate;
the modified biochar is prepared by the following method: mixing biomass charcoal with 0.5-2% by mass of oxoacid solution, reacting at 75-95 deg.C for 80-120min, and filtering to obtain the final product; wherein the mass ratio of the biomass charcoal to the oxygen-containing acid solution is 5-10: 90-95.
2. The soil heavy metal passivator of claim 1, wherein the oxygen-containing acid solution is a boric acid solution or a phosphoric acid solution.
3. The soil heavy metal passivator of claim 1, wherein the biomass char is selected from fruit shells, wood or crop straw.
4. Use of the soil heavy metal passivator of any one of claims 1 to 3 in remediation of heavy metal contaminated soil.
5. The soil heavy metal passivator of any one of claims 1-3, further comprising organic matter 30-50 parts.
6. The soil heavy metal passivator of claim 5, wherein the organic matter is a bio-organic or organic fertilizer.
7. The preparation method of the soil heavy metal passivator as claimed in claim 5, characterized by comprising the following steps:
weighing the modified biochar, the organic matter and the activating agent according to the parts by weight, and mixing to obtain the organic biochar.
8. Use of the soil heavy metal passivator of claim 5 in remediation of heavy metal contaminated soil, to promote plant growth.
9. The use according to claim 8, wherein the mass ratio of soil to passivating agent is 1: 0.5-10 when the soil heavy metal passivating agent is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111591452.8A CN114149806A (en) | 2021-12-23 | 2021-12-23 | Soil heavy metal passivator and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111591452.8A CN114149806A (en) | 2021-12-23 | 2021-12-23 | Soil heavy metal passivator and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114149806A true CN114149806A (en) | 2022-03-08 |
Family
ID=80452296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111591452.8A Pending CN114149806A (en) | 2021-12-23 | 2021-12-23 | Soil heavy metal passivator and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114149806A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143556A (en) * | 2013-02-07 | 2013-06-12 | 广东省农业科学院农业资源与环境研究所 | Passivating agent for reducing cadmium activity of acidic vegetable soil and use method thereof |
| CN104258809A (en) * | 2014-09-15 | 2015-01-07 | 河南农业大学 | Modified biomass charcoal and remediation method of heavy metal contaminated soil |
| CN107931323A (en) * | 2017-11-24 | 2018-04-20 | 中国电建集团成都勘测设计研究院有限公司 | Passivator and its preparation, application method are repaired for heavy metals in farmland combined contamination soil |
| CN109485509A (en) * | 2018-12-29 | 2019-03-19 | 中国科学院沈阳应用生态研究所 | The Slow-release organic fertilizer of passivation restoration of soil polluted by heavy metal and preparation and application |
| CN111266400A (en) * | 2020-03-04 | 2020-06-12 | 中国科学院植物研究所 | Method for safely utilizing heavy metal polluted farmland based on combination of biochar in-situ passivation and sweet sorghum planting |
| CN113121290A (en) * | 2021-04-20 | 2021-07-16 | 南京大学 | Method for synchronously promoting ammonia nitrogen removal and lead-cadmium passivation in soil |
-
2021
- 2021-12-23 CN CN202111591452.8A patent/CN114149806A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143556A (en) * | 2013-02-07 | 2013-06-12 | 广东省农业科学院农业资源与环境研究所 | Passivating agent for reducing cadmium activity of acidic vegetable soil and use method thereof |
| CN104258809A (en) * | 2014-09-15 | 2015-01-07 | 河南农业大学 | Modified biomass charcoal and remediation method of heavy metal contaminated soil |
| CN107931323A (en) * | 2017-11-24 | 2018-04-20 | 中国电建集团成都勘测设计研究院有限公司 | Passivator and its preparation, application method are repaired for heavy metals in farmland combined contamination soil |
| CN109485509A (en) * | 2018-12-29 | 2019-03-19 | 中国科学院沈阳应用生态研究所 | The Slow-release organic fertilizer of passivation restoration of soil polluted by heavy metal and preparation and application |
| CN111266400A (en) * | 2020-03-04 | 2020-06-12 | 中国科学院植物研究所 | Method for safely utilizing heavy metal polluted farmland based on combination of biochar in-situ passivation and sweet sorghum planting |
| CN113121290A (en) * | 2021-04-20 | 2021-07-16 | 南京大学 | Method for synchronously promoting ammonia nitrogen removal and lead-cadmium passivation in soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | The effects of biochar addition on soil physicochemical properties: A review | |
| CN108251118B (en) | Biochar, soil heavy metal stabilizing agent and preparation method thereof | |
| NL2026659B1 (en) | Plant growth medium based on residue from high temperature thermal oxidation of oily solid wase | |
| CN110615711B (en) | Soil conditioner for adjusting salinity and alkalinity and preparation method thereof | |
| CN104119156B (en) | The production method of diatomite compression Nutrition Soil | |
| CN107056409B (en) | Functional biochar-based nutrient medium for preventing and treating root rot and preparation method thereof | |
| CN110743498A (en) | Preparation method of edible fungus residue biochar | |
| CN111320988A (en) | Soil heavy metal passivator | |
| CN104119171A (en) | Production method of graphite tailing compressed nutrient soil | |
| CN104109035B (en) | The production method of diatomite mine tailing compression Nutrition Soil | |
| Dimin et al. | Urea impregnated biochar to minimize nutrients loss in paddy soils | |
| CN104119160A (en) | Production method of zeolite tailings compressed nutrient soil | |
| CN104119154A (en) | Method for producing boron mud compressed nutrient soil | |
| CN114149806A (en) | Soil heavy metal passivator and preparation method and application thereof | |
| CN108947409B (en) | Carbon-fixing vegetation concrete | |
| CN111635276A (en) | Conditioner for soil remediation and using method thereof | |
| CN104119195A (en) | Production method of pumice compressed nutrient soil | |
| CN112358360A (en) | Biomass charcoal-based fertilizer | |
| CN110249736B (en) | Improvement method of beach saline-alkali soil | |
| CN113800498A (en) | Biochar and preparation method and application thereof | |
| CN111607402A (en) | Method for preparing soil conditioner by using high ammonia nitrogen wastewater and application | |
| Saffari et al. | Effects of compost, vermicompost and sulfur compost on Scindapsus aureus growth | |
| CN112174109A (en) | Seaweed biochar as well as preparation method and application thereof | |
| CN114891512B (en) | Modified biochar composite material for improving saline-alkali soil and loading calcium chloride and preparation method thereof | |
| CN111548216A (en) | Nutrient solution for increasing survival rate of haloxylon ammodendron in arid area and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220308 |