CN106800939A - Renovation agent and preparation method thereof for administering soil heavy metal combined pollution - Google Patents
Renovation agent and preparation method thereof for administering soil heavy metal combined pollution Download PDFInfo
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- CN106800939A CN106800939A CN201611216682.5A CN201611216682A CN106800939A CN 106800939 A CN106800939 A CN 106800939A CN 201611216682 A CN201611216682 A CN 201611216682A CN 106800939 A CN106800939 A CN 106800939A
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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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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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
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- C09K2101/00—Agricultural use
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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
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Abstract
The invention discloses a kind of renovation agent for administering soil heavy metal combined pollution and preparation method thereof.The renovation agent includes the component of following weight portion：6~8 parts of modified Nano carbon black, sodium bentonite load 2~5 parts of nano zero valence iron, 1~2 part of phosphate mineral and 5~10 parts of the agriculture and forestry organic waste material that becomes thoroughly decomposed；Its preparation method is：(1) phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed are crushed to the powder that particle diameter is 100~200 mesh, drying for standby respectively；(2) modified Nano carbon black, phosphoric acid mineral salt, sodium bentonite load nano zero valence iron and the agriculture and forestry organic waste material that becomes thoroughly decomposed are mixed by formula, in being stirred in closed container, the renovation agent for administering soil heavy metal combined pollution is obtained.
Description
Technical field
The present invention relates to soil pollution recovery technique field, and in particular to one kind is for administering soil heavy metal combined pollution
Renovation agent and preparation method thereof.
Background technology
As China's economy is growing, commercial production scale constantly expands, soil this resource for the survival of mankind
The pressure for being born is increasing, and heavy metal pollution of soil has turned into the environmental problem that China's contaminated area is most wide, harm is maximum
One of.
China receives the cultivated area of heavy metal pollution more than 20,000,000 hm2, account for the 1/5 of cultivated area；In China 1,400,000
hm2In irrigating region, the soil for having 64.8% is subjected to heavy metal pollution, and wherein slight pollution accounts for 46.7%, and intermediate pollution is accounted for
9.7%, severe contamination accounts for 8.4%；The t of grain about 12,000,000 of the annual output heavy metal pollution of China, in 24 provinces of investigation
(city), in 320 emphasis contaminated areas, there is 60.6 ten thousand hm2Field crops pollutant it is exceeded, account for investigation the gross area 20%,
Wherein 80% above is content of beary metal is exceeded, is protruded the most with Pb, Cd, Cu, Hg and its combined pollution；How effectively to repair
Heavy-metal contaminated soil, maintains the sustainable use in soil, it has also become problem demanding prompt solution.
Heavy metal pollution of soil reparation refers to that heavy metal in soil is cleared out of into the soil body using physics, chemistry or biological method
Or be fixed in soil, to reduce heavy metals mobilization and biological effectiveness；At present, relevant heavy-metal contaminated soil reparation
Research be mainly divided to two classes：1) using technological means from original position removal heavy metal contaminants, mainly with various physical engineering measures
It is representative with phytoremediation；2) in-situ passivation reparation, refers to using the measures such as chemistry, biology change heavy metal contaminants in soil
Chemical form and occurrence status, so as to reduce the biological effectiveness and animal migration of heavy metal, reduce the suction of plant heavy metal
Receive, mainly with chemical fixation and microorganism remediation as representative；The former quantities is big, expends the application that height is not suitable for large area.
In view of heavy metal pollution of soil is often referred to, and area is very big, the high cost of various engineering reclamation activities, therefore hair
Exhibition in-situ passivation method is the preferable selection of current mild or moderate contaminated soil remediation；In-situ passivation recovery technique is a kind of economical high
The pollutant abatement technology of effect, the need for meeting China's sustainable agriculture development, is more and more widely closed by soil, environmentalist
Note.
Chemical passivation reparation is based on for the purpose of reducing pollution risk, such as viscous by stabilization agent is added in soil
Native mineral, phosphate, organic materials and microorganism etc., to adjust and change physicochemical properties of the heavy metal in soil, make
It produces the series reactions such as absorption, complexing, precipitation, ion exchange and redox, makes heavy metal by exchangeable species (activity
Carbonate combine state, Fe-Mn oxide, organic and residual form (activity is weak) are changed into by force), are effectively reduced a water-soluble huge sum of money
Transportable property, toxicity and the biological effectiveness for belonging to.
But the heavy metal pollution in soil is often and the depositing with other elements based on a certain heavy metal element
In i.e. multi-metal and the combined pollution deposited, in soil between multi-metal element or compound and heavy metal and soil circle
Exist between face and interact, need to consider detection device for multi metallic elements during using chemical passivation recovery technique from passivator
While problem of passivation, but mostly using the fixed reparation of single heavy metal element, thus screening during many passivation are repaired at present
The passivator difficulty that can be simultaneously passivated, repair various heavy is larger, makes its contaminated soil remediation technology challenging.
The content of the invention
For above-mentioned deficiency of the prior art, the present invention provides a kind of for administering repairing for soil heavy metal combined pollution
Multiple agent and preparation method thereof, it efficiently solves the problems, such as that existing renovation agent cannot be while be passivated reparation various heavy.
To solve above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of renovation agent for administering soil heavy metal combined pollution, including following weight portion component：
6~8 parts of modified Nano carbon black, 2~5 parts of nano zero valence iron of sodium bentonite load, 1~2 part of phosphate mineral with
And 5~10 parts of the agriculture and forestry organic waste material that becomes thoroughly decomposed.
Further, including following weight portion component：8 parts of modified Nano carbon black, sodium bentonite load nano zero-valence
5 parts of 5 parts of iron, 1 part of phosphate mineral and agriculture and forestry organic waste material.
Further, modified Nano carbon black is prepared by the following method and obtains：Nano carbon black is cleaned with deionized water, in
Dried to constant weight under the conditions of 100~120 DEG C, add the concentrated nitric acid of 200~220mL, 2~2.5h is reacted in 120~140 DEG C
Afterwards, it is centrifuged, removes supernatant, then clean centrifugation repeatedly with distilled water, until supernatant pH value is between 2~5, and keeps permanent
It is fixed, dried to constant weight under the conditions of 100~120 DEG C, obtain modified Nano carbon black.
Further, sodium bentonite load nano zero valence iron is prepared by the following method and obtains：
(1) calcium-base bentonite is crushed, crosses 100 mesh sieves, be subsequently adding 1~1.5L, concentration is the NaCl solution of 1mol/L,
1.5~2h of stirring, stands 24h, removes supernatant, obtains slurries；
(2) aforesaid operations are repeated 4~5 times with step (1) gained slurries as substrate again, obtain sodium base modified alta-mud slurries,
Be centrifuged, wash after separate, in 75 DEG C of dryings, then it is the powder that particle diameter is 100 mesh to crush, and obtains sodium base modified alta-mud；
(3) under nitrogen atmosphere, the sodium base modified alta-mud obtained by step (2) is added into 250~300mL, concentration is
The FeSO of 0.45mol/L4·7H2In O solution, stirring, and 250~300mL is dropwise added dropwise in whipping process, concentration is
The NaBH of 0.45mol/L4Solution, NaBH4After solution completion of dropwise addition, continue to stir 30~40min, obtain reaction solution；
(4) to magnet, separation product and reaction solution is added in step (3) gained reaction solution, under nitrogen atmosphere, with anhydrous
Ethanol washed product 4~5 times, then suction filtration is to being completely dried, and sodium bentonite load nano zero valence iron is obtained.
Further, one or more in phosphate mineral hydroxyapatite, ground phosphate rock, phosphoric acid, phosphate fertilizer and bone black.
Further, the agriculture and forestry organic waste material that becomes thoroughly decomposed is at least one become thoroughly decomposed in stalk, become thoroughly decomposed marc and vinasse；Become thoroughly decomposed straw
Stalk is maize straw, paddy rice bar or reed rod；The marc that becomes thoroughly decomposed is lemon dregs, pomace, citrus pulp or bagasse.
The above-mentioned preparation method for administering the renovation agent of soil heavy metal combined pollution, comprises the following steps：
(1) phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed are crushed to the powder that particle diameter is 100~200 mesh respectively, in 100
~120 DEG C of drying for standby；
(2) modified Nano carbon black, phosphoric acid mineral salt, sodium bentonite are loaded into nano zero valence iron and agriculture of becoming thoroughly decomposed by formula
Woods discarded object mixes, and in being stirred in closed container, the renovation agent for administering soil heavy metal combined pollution is obtained.
The above-mentioned application method for administering the renovation agent of soil heavy metal combined pollution：To be used to administer heavy metal-polluted soil
The renovation agent uniform broadcasting of combined pollution is in soil surface, then carries out ploughing soil, is passivated 20~60 days；Wherein, for administering
The amount of broadcasting sowing of the renovation agent of soil heavy metal combined pollution is the 4%~8% of soil quality.
Beneficial effects of the present invention are：
1st, it is of the invention with nanometer carbon black, nano zero valence iron as primary raw material, with the spy that surface area is big, surface-active is strong
Point, can produce stronger absorption, chelant ability, and by modified and load, agglomeration, the enhancing that can reduce nano material are steady
Qualitative energy, allows heavy metal of the passivator steadily in the long term in curing soil.
2nd, the phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed of addition, can adjust the pH of soil, improve soil soil property, carry
Soil fertility high, in addition, the increase of organic matter can also increase CEC and electrical conductivity in soil, promotes heavy metal conversion.
3rd, the present invention has passivation to various heavies such as Pb, Cd, Cu, Zn, As, can make the content of each heavy metal
At least reduce by 50%.
4th, raw material sources of the present invention are wide, using convenient, to environment non-secondary pollution, it is easy to promote, with wide market
Prospect.
Specific embodiment
Specific embodiment of the invention is described below, this hair is understood in order to those skilled in the art
It is bright, it should be apparent that the invention is not restricted to the scope of specific embodiment, for those skilled in the art,
As long as in appended claim restriction and the spirit and scope of the present invention for determining, these changes are aobvious and easy to various change
See, all are using the innovation and creation of present inventive concept in the row of protection.
Embodiment 1
A kind of renovation agent for administering soil heavy metal combined pollution, including following weight portion component：Modified Nano
6 parts of carbon black, sodium bentonite load 4 parts of nano zero valence iron, 2 parts of hydroxyapatite, become thoroughly decomposed 8 parts of stalk and 2 parts of the schlempe that becomes thoroughly decomposed.
Wherein, modified Nano carbon black is prepared by following methods：10g nanometer carbon blacks are weighed, is cleaned with deionized water, in
Dried to constant weight under the conditions of 100 DEG C, add 200ml concentrated nitric acids, after reacting 2h in 140 DEG C, centrifugation removes supernatant, then use
Distilled water cleans centrifugation repeatedly, until supernatant pH value is 2, and protects constant, is dried to constant weight under the conditions of 120 DEG C, obtains
Modified Nano carbon black.
Sodium bentonite load nano zero valence iron is prepared by the following method and obtains：
(1) 100g calcium-base bentonites are crushed, cross 100 mesh sieves, be subsequently adding 1L, concentration is the NaCl solution of 1mol/L,
Electric stirring 2h, stands 24h, removes supernatant, obtains slurries；
(2) aforesaid operations are repeated 4 times with step (1) gained slurries as substrate again, obtains sodium base modified alta-mud slurries, will
Separated after its centrifugation, washing, in 75 DEG C of dryings, then it is the powder that particle diameter is 100 mesh to crush, and obtains sodium base modified alta-mud；
(3) under nitrogen atmosphere, the sodium base modified alta-mud 8g obtained by step (2) is taken, 250mL is added, concentration is
The FeSO of 0.45mol/L4·7H2In O solution, stirring, and 250mL is dropwise added dropwise in whipping process, concentration is 0.45mol/L
NaBH4Solution, NaBH4After solution completion of dropwise addition, continue to stir 30min, obtain reaction solution；
(4) to magnet, separation product and reaction solution is added in step (3) gained reaction solution, under nitrogen atmosphere, with anhydrous
Ethanol washed product 4 times, then suction filtration is to being completely dried, and sodium bentonite load nano zero valence iron is obtained.
The above-mentioned preparation method for administering the renovation agent of soil heavy metal combined pollution, comprises the following steps：
(1) phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed are crushed to the powder that particle diameter is 100 mesh respectively, it is dry in 100 DEG C
It is dry standby；
(2) modified Nano carbon black, hydroxyapatite, sodium bentonite are loaded into nano zero valence iron by formula, become thoroughly decomposed stalk
And schlempe mixing of becoming thoroughly decomposed, in being stirred in closed reactor, the reparation for administering soil heavy metal combined pollution is obtained
Agent.
Embodiment 2
A kind of renovation agent for administering soil heavy metal combined pollution, including following weight portion component：Modified Nano
8 parts of carbon black, sodium bentonite load 5 parts of nano zero valence iron, 1 part of hydroxy-apatite, become thoroughly decomposed 3.75 parts of stalk and the schlempe 1.25 that becomes thoroughly decomposed
Part.
Wherein, modified Nano carbon black is prepared by following methods：12g nanometer carbon blacks are weighed, is cleaned with deionized water, in
Dried to constant weight under the conditions of 120 DEG C, add 210ml concentrated nitric acids, after reacting 2h in 140 DEG C, centrifugation removes supernatant, then use
Distilled water cleans centrifugation repeatedly, until supernatant pH value is 5, and keeps constant, is dried to constant weight under the conditions of 120 DEG C, obtains
Modified Nano carbon black.
Sodium bentonite load nano zero valence iron is prepared by the following method and obtains：
(1) 120g calcium-base bentonites are crushed, crosses 100 mesh sieves, be subsequently adding 1.2L, concentration is molten for the NaCl of 1mol/L
Liquid, electric stirring 2h stands 24h, removes supernatant, obtains slurries；
(2) aforesaid operations are repeated 5 times with step (1) gained slurries as substrate again, obtains sodium base modified alta-mud slurries, will
Separated after its centrifugation, washing, in 75 DEG C of dryings, then it is the powder that particle diameter is 100 mesh to crush, and obtains sodium base modified alta-mud；
(3) under nitrogen atmosphere, the sodium base modified alta-mud 8g obtained by step (2) is taken, 270mL is added, concentration is
The FeSO of 0.45mol/L4·7H2In O solution, stirring, and 270mL is dropwise added dropwise in whipping process, concentration is 0.45mol/L
NaBH4Solution, NaBH4After solution completion of dropwise addition, continue to stir 30min, obtain reaction solution；
(4) to magnet, separation product and reaction solution is added in step (3) gained reaction solution, under nitrogen atmosphere, with anhydrous
Ethanol washed product 5 times, then suction filtration is to being completely dried, and sodium bentonite load nano zero valence iron is obtained.
The above-mentioned preparation method for administering the renovation agent of soil heavy metal combined pollution, comprises the following steps：
(1) phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed are crushed to the powder that particle diameter is 150 mesh respectively, it is dry in 120 DEG C
It is dry standby；
(2) modified Nano carbon black, hydroxyapatite, sodium bentonite are loaded into nano zero valence iron by formula, become thoroughly decomposed stalk
And schlempe mixing of becoming thoroughly decomposed, in being stirred in closed reactor, the reparation for administering soil heavy metal combined pollution is obtained
Agent.
Embodiment 3
A kind of renovation agent for administering soil heavy metal combined pollution, including following weight portion component：Modified Nano
8 parts of carbon black, sodium bentonite load 5 parts of nano zero valence iron, 2 parts of hydroxy-apatite, become thoroughly decomposed 4 parts of stalk and 2 parts of the schlempe that becomes thoroughly decomposed.
Wherein, modified Nano carbon black is prepared by following methods：12g nanometer carbon blacks are weighed, is cleaned with deionized water, in
Dried to constant weight under the conditions of 110 DEG C, add 220ml concentrated nitric acids, after reacting 2.5h in 120 DEG C, centrifugation removes supernatant, then
Clean centrifugation repeatedly with distilled water, until supernatant pH value is 4, and keep constant, dried to constant weight under the conditions of 100 DEG C,
Obtain modified Nano carbon black.
Sodium bentonite load nano zero valence iron is prepared by the following method and obtains：
(1) 120g calcium-base bentonites are crushed, crosses 100 mesh sieves, be subsequently adding 1.5L, concentration is molten for the NaCl of 1mol/L
Liquid, electric stirring 1.5h stands 24h, removes supernatant, obtains slurries,
(2) aforesaid operations are repeated 5 times with step (1) gained slurries as substrate again, obtains sodium base modified alta-mud slurries, will
Separated after its centrifugation, washing, in 75 DEG C of dryings, then it is the powder that particle diameter is 100 mesh to crush, and obtains sodium base modified alta-mud；
(3) under nitrogen atmosphere, the sodium base modified alta-mud 8g obtained by step (2) is taken, 300mL is added, concentration is
The FeSO of 0.45mol/L4·7H2In O solution, stirring, and 300mL is dropwise added dropwise in whipping process, concentration is 0.45mol/L
NaBH4Solution, NaBH4After solution completion of dropwise addition, continue to stir 40min, obtain reaction solution；
(4) to magnet, separation product and reaction solution is added in step (3) gained reaction solution, under nitrogen atmosphere, with anhydrous
Ethanol washed product 5 times, then suction filtration is to being completely dried, and sodium bentonite load nano zero valence iron is obtained.
The above-mentioned preparation method for administering the renovation agent of soil heavy metal combined pollution, comprises the following steps：
(1) phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed are crushed to the powder that particle diameter is 200 mesh respectively, it is dry in 110 DEG C
It is dry standby；
(2) modified Nano carbon black, hydroxyapatite, sodium bentonite are loaded into nano zero valence iron by formula, become thoroughly decomposed stalk
And schlempe mixing of becoming thoroughly decomposed, in being stirred in closed reactor, the reparation for administering soil heavy metal combined pollution is obtained
Agent.
Experimental example 1
In agro-farming season, the 20cm soil layers on contaminated ground top layer are turned over, granular soil crushes big, and keep soil to put down
It is whole, 6% uniform broadcasting of soil quality will be pressed in soil surface using renovation agent obtained in the embodiment of the present invention 1, then carry out soil
Turn over, and keep soil moisture content for 70%, be passivated 60 days.
Sampled from the soil after reparation again, detect basis《National Investigation of Soil Pollution sample analysis measuring technology regulation》
Middle specific method is tested heavy metal-polluted soil concentration, contrast before the heavy metal-polluted soil concentration and reparation after detection reparation, is tied
Fruit is shown in Table 1.
Experimental example 2
In agro-farming season, the 20cm soil layers on contaminated ground top layer are turned over, crush soil bulky grain, and keep soil to put down
It is whole, 8% uniform broadcasting of soil quality will be pressed in soil surface using renovation agent obtained in the embodiment of the present invention 2, then carry out soil
Turn over, and keep soil moisture content for 60%, be passivated 40 days, annual 2 times.
Sampled from the soil after reparation again, detect basis《National Investigation of Soil Pollution sample analysis measuring technology regulation》
Middle specific method is tested heavy metal-polluted soil concentration, contrast before the heavy metal-polluted soil concentration and reparation after detection reparation, is tied
Fruit is shown in Table 1.
Heavy metal concentration is contrasted before and after the heavy-metal contaminated soil of table 1 is repaired
Experimental example 3
3 pieces of selection heavy-metal contaminated soil soil, every piece is divided into 3 parts, there is individual control group, 2 experimental groups in every piece.
Control group processing mode：Rice cultivation in the usual way, and by local habits fertilization and field management.
Experimental group processing mode：Apply soil according to the mode of experimental example 1 and experimental example 2 respectively on the basis of control group to repair
Multiple agent, after after rice harvesting, contrast control group is shown in Table 2 with rice yield in experimental group, comparing result.
Influence of the soil-repairing agent of table 2 to rice yield
As a result
Can be obtained by Tables 1 and 2, repaired dose is pressed 6% uniform broadcasting of soil quality in soil surface, renovation agent passivation
After 60 days, heavy metal in soil Pb, Cd available state reduction by more than 60%, Cu, Zn, As available state reduction by more than 50%；By soil
In soil surface, after repaired dose is passivated 40 days, heavy metal in soil Ab, Cd available state are reduced for 8% uniform broadcasting of quality
More than 70%, Cu, Zn, As available state reduction by more than 55%.
Meanwhile, after being processed through soil-repairing agent obtained in the present invention, can improved soil, increase soil fertility so that paddy rice
Yield is significantly lifted, and every mu of effective fringe and Defined daily doses also substantially increase.
Claims (8)
1. a kind of renovation agent for administering soil heavy metal combined pollution, it is characterised in that the component including following weight portion：
6~8 parts of modified Nano carbon black, 2~5 parts of nano zero valence iron of sodium bentonite load, 1~2 part of phosphate mineral and corruption
5~10 parts of ripe agriculture and forestry organic waste material.
2. the renovation agent for administering soil heavy metal combined pollution according to claim 1, it is characterised in that：Including with
The component of lower weight portion：
8 parts of modified Nano carbon black, 5 parts of nano zero valence iron of sodium bentonite load, 1 part of phosphate mineral and agricultural of becoming thoroughly decomposed are discarded
5 parts of thing.
3. the renovation agent for administering soil heavy metal combined pollution according to claim 1 and 2, it is characterised in that change
Property nano carbon black is prepared by the following method and obtains：Nano carbon black is cleaned with deionized water, is dried under the conditions of 100~120 DEG C
To constant weight, the concentrated nitric acid of 200~220mL is added, after reacting 2~2.5h in 120~140 DEG C, centrifugation removes supernatant, then
Clean centrifugation repeatedly with distilled water, until supernatant pH value is between 2~5, and keeps constant, under the conditions of 100~120 DEG C
Dry to constant weight, obtain modified Nano carbon black.
4. the renovation agent for administering soil heavy metal combined pollution according to claim 1 and 2, it is characterised in that sodium
Base bentonite load nano zero valence iron is prepared by the following method and obtains：
(1) calcium-base bentonite is crushed, crosses 100 mesh sieves, be subsequently adding 1~1.5L, concentration is the NaCl solution of 1mol/L, stirring
1.5~2h, stands 24h, removes supernatant, obtains slurries；
(2) aforesaid operations are repeated 4~5 times with step (1) gained slurries as substrate again, sodium base modified alta-mud slurries is obtained, by it
Separated after centrifugation, washing, in 75 DEG C of dryings, then it is the powder that particle diameter is 100 mesh to crush, and obtains sodium base modified alta-mud；
(3) under nitrogen atmosphere, the sodium base modified alta-mud obtained by step (2) is added into 250~300mL, concentration is
The FeSO of 0.45mol/L4·7H2In O solution, stirring, and 250~300mL is dropwise added dropwise in whipping process, concentration is
The NaBH of 0.45mol/L4Solution, NaBH4After solution completion of dropwise addition, continue to stir 30~40min, obtain reaction solution；
(4) to step (3) gained reaction solution in add magnet, separation product and reaction solution, under nitrogen atmosphere, use absolute ethyl alcohol
Washed product 4~5 times, then suction filtration is to being completely dried, and sodium bentonite load nano zero valence iron is obtained.
5. the renovation agent for administering soil heavy metal combined pollution according to claim 1 and 2, it is characterised in that：Institute
It is one or more in hydroxyapatite, ground phosphate rock, phosphoric acid, phosphate fertilizer and bone black to state phosphate mineral.
6. the renovation agent for administering soil heavy metal combined pollution according to claim 1 and 2, it is characterised in that：Institute
It is at least one become thoroughly decomposed in stalk, become thoroughly decomposed marc and vinasse to state the agriculture and forestry organic waste material that becomes thoroughly decomposed；The stalk that becomes thoroughly decomposed is for corn stalk
Stalk, paddy rice bar or reed rod；The marc that becomes thoroughly decomposed is for lemon dregs, pomace, citrus pulp or bagasse.
7. the preparation method of the renovation agent for administering soil heavy metal combined pollution described in claim 1~6, its feature exists
In comprising the following steps：
(1) phosphate mineral and the agriculture and forestry organic waste material that becomes thoroughly decomposed are crushed to the powder that particle diameter is 100~200 mesh respectively, in 100~
120 DEG C of drying for standby；
(2) modified Nano carbon black, phosphoric acid mineral salt, sodium bentonite load nano zero valence iron and agricultural of becoming thoroughly decomposed are given up by formula
Gurry mixes, and in being stirred in closed container, the renovation agent for administering soil heavy metal combined pollution is obtained.
8. the application method of the renovation agent for administering soil heavy metal combined pollution described in claim 1~7, its feature exists
In：The renovation agent uniform broadcasting for administering soil heavy metal combined pollution will be used in soil surface, then carry out ploughing soil, be passivated
20~60 days；Wherein, the amount of broadcasting sowing of the renovation agent for administering soil heavy metal combined pollution is the 4%~8% of soil quality.
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| CN108085018A (en) * | 2017-12-30 | 2018-05-29 | 张静 | A kind of soil heavy metal passivant and preparation method thereof |
| CN109158411A (en) * | 2018-06-26 | 2019-01-08 | 昆明理工大学 | The method of one heavy metal species soil modification |
| CN109593530A (en) * | 2018-11-07 | 2019-04-09 | 河北德龙环境工程股份有限公司 | It is a kind of to adsorb multiple heavy metal cation passivator and preparation method thereof |
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| CN110653248A (en) * | 2019-10-09 | 2020-01-07 | 安徽省农业科学院土壤肥料研究所 | Composite passivation material suitable for arsenic, cadmium and lead polluted rice field and application thereof |
| CN111019663A (en) * | 2019-12-24 | 2020-04-17 | 甘肃瀚兴环保科技有限公司 | Heavy metal passivation material of nano zero-valent iron composite attapulgite, preparation method and application thereof |
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| CN111019664A (en) * | 2019-12-26 | 2020-04-17 | 甘肃瀚兴环保科技有限公司 | Method for preparing soil heavy metal passivation material by using palygorskite loaded with nano zero-valent iron |
| CN111471466A (en) * | 2020-04-16 | 2020-07-31 | 武汉市秀谷科技有限公司 | Medicament for controlling soil heavy metal substance to transfer to crops and application |
| CN113058989A (en) * | 2021-03-16 | 2021-07-02 | 苏州益亮生态修复有限公司 | Method for restoring farmland polluted by heavy metals |
| CN113233570A (en) * | 2021-04-27 | 2021-08-10 | 北京工业大学 | Preparation method of sodium bentonite loaded zero-valent iron and application of sodium bentonite loaded zero-valent iron in treatment of composite polluted underground water |
| CN114289481A (en) * | 2021-12-29 | 2022-04-08 | 武汉市秀谷科技有限公司 | Method for treating Cd and As pollution in soil |
| CN115634659A (en) * | 2022-10-31 | 2023-01-24 | 生态环境部南京环境科学研究所 | Soil remediation agent based on modified nano zero-valent iron and preparation method thereof |
| CN115634659B (en) * | 2022-10-31 | 2023-06-23 | 生态环境部南京环境科学研究所 | Soil restoration agent based on modified nano zero-valent iron and preparation method thereof |
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