CN108372198A - Utilize the method for modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil - Google Patents
Utilize the method for modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil Download PDFInfo
- Publication number
- CN108372198A CN108372198A CN201810120239.0A CN201810120239A CN108372198A CN 108372198 A CN108372198 A CN 108372198A CN 201810120239 A CN201810120239 A CN 201810120239A CN 108372198 A CN108372198 A CN 108372198A
- Authority
- CN
- China
- Prior art keywords
- solution
- nano zero
- soil
- feso
- heavy metal
- 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
Classifications
-
- 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
-
- 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
- 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
-
- 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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
Abstract
The invention discloses the methods using modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil, nano zero valence iron is modified using polyvinylpyrrolidone, pass through steric hindrance effect and electrostatic steric effect, reduce the reunion of nano zero valence iron, increase its dispersibility and migration in the soil, and the nano zero valence iron of polyvinyl pyrrolidone modified is added in the form of a solution in heavy-metal composite pollution acid soil, it stirs evenly, it is placed on draughty position, carry out stabilization processes, and make soil moisture keep 60% 70% water-holding capacity.Modified nano zero valence iron is more efficient to the stabilisation of heavy metal in heavy-metal composite pollution acid soil, easy to operate, and remediation efficiency is high, and rehabilitation cost is low, to environment non-secondary pollution.
Description
Technical field
The invention belongs to pollute Heavy Metals In Environment to repair field, and in particular to a kind of to utilize modified Nano Zero-valent Iron
The method of remediating heavy metal combined pollution acid soil.
Background technology
The application of mankind's activity such as mining, metal smelt, Wastewater Irrigation in Farmland, agricultural sludge and fertilizer and insecticide,
A large amount of heavy metal pollution of soil has been had resulted in, the ecological balance, food security and health are seriously threatened.Wherein cadmium
（Cd）, mercury（Hg）, arsenic（As）, chromium（Cr）And lead（Pb）It is considered as " five poisonous creatures: scorpion, viper, centipede, house lizard, toad " in Main Heavy Metal.In China 24
A province（And city）In investigating to the contaminated proportion of crop planting carried out, 80% soil pollution type is heavy metal pollution,
Wherein mining and metallurgy activity is the main source of heavy metal pollution.Either by the more serious abandoned location of industry and mining of heavy metal pollution, still
The relatively light agricultural pollution soil of pollution level, often shows as the combined pollution of various heavy.It is increasingly complex, it is dirty
Reciprocation would generally occur between each heavy metal species of dye soil, administered with recovery technique using band for heavy metal pollution of soil
Difficulty is carried out.
The non-biodegradable of heavy metal determines it by long-term existence in soil.In order to reduce the life of heavy metal contaminants
Object validity and migration, in numerous Heavy Metal Pollution Control technologies, the stabilization technology of heavy metal is considered economical
Effectively and the recovery technique smaller to environmental perturbation, it is increasingly taken seriously, and is gradually applied to repairing for heavy metal pollution place
It is multiple.Zero-valent Iron（Zero valent iron, ZVI）Technology, because its operating procedure is simple, treatment effeciency is high, operating cost is low, energy
The features such as small, material is easy to get is consumed, a kind of more potential soil stabilization recovery technique is considered as.Wherein, the zeroth order of Nano grade
Iron（Nano-scale zero-valent iron, nZVI）It is gone back with what common grade or micron order Zero-valent Iron cannot compare
Former adsorption capacity efficient can be obtained pollutant, and such as chlorinated organics, toxic metals, inorganic compound are changed into low toxicity or inertia
Substance, applied in water environment, but still lack research and application in the soil.
Due to nano zero valence iron particle surface electrostatic charge gravitation, high surface energy, intergranular Van der Waals force and particle
The hydrogen bond on surface and other chemical bonds cause nano particle to be easy to form condensate, and nano zero valence iron Zero-valent Iron easily quilt
Oxidation, the two defects constrain its dispersibility in polluted-water and soil, migration, are to limit its repair ability most
Big obstacle.Therefore, nano zero valence iron is modified, and is applied to combined pollution heavy metal soil, to heavy-metal composite pollution
The reparation of soil is of great significance.
Invention content
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of easy to operate, remediation efficiency is high, repair at
Sheet is low, and avoids causing environment the utilization modified Nano Zero-valent Iron reparation using polyvinyl pyrrolidone modified of secondary pollution
The method of heavy-metal composite pollution acid soil；Modified Nano Zero-valent Iron is also disclosed in remediating heavy metal combined pollution acid soil
Application in earth.
To realize the above-mentioned technical purpose, the present invention uses technical solution below：
Using the method for modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil, include the following steps：Step 1）
FeSO4The preparation of solution, step 2）FeSO containing polyvinylpyrrolidone4The preparation of solution, step 3）NaBH4The system of solution
It is standby, step 4）The preparation of modified Nano Zero-valent Iron, step 5）It stirs evenly, step 6）Stabilization processes.
Specifically, described method includes following steps：
Step 1）FeSO4The preparation of solution：Take FeSO4·7H2O is placed in container, and appropriate ultra-pure water is added, is stirred with glass bar
Dissolving, shakes up, and the FeSO of 0.01M is made4Solution；
Step 2）FeSO containing polyvinylpyrrolidone4The preparation of solution：Polyvinylpyrrolidone is taken, in nitrogen protection and is stirred
Under conditions of mixing device stirring, it is allowed to be dissolved in 0.01M FeSO4In solution, 15min is stirred；
Step 3）NaBH4The preparation of solution：Take NaBH4It is placed in container, appropriate ultra-pure water is added, stirring and dissolving shakes up, and is made
The NaBH of 0.03M4Solution；
Step 4）The preparation of modified Nano Zero-valent Iron：By step 2）FeSO of the gained containing polyvinylpyrrolidone4Solution is placed in
In container, under conditions of nitrogen protection and blender stir, by step 3）Gained NaBH4Solution is slowly dropped in container,
Continue to stir 20min, be filtered by vacuum after standing five minutes, washs, under nitrogen protection, dried in baking oven；
Step 5）It stirs evenly：Toward step 4）Modified Nano zero-valent iron particle in ultra-pure water is added, stir, Fe is made0Solution,
Then by Fe0Solution is added in heavy metal pollution acid soil, is used in combination water that soil moisture is made to be saturated, and is then stirred evenly；
Step 6）Stabilization processes：The heavy metal pollution acid soil that will be stirred evenly is placed on draughty position, processing
14-21 days.
The polyvinylpyrrolidone and 0.01M FeSO4The ratio of solution is 8g：1L.
The step 4）In, the FeSO containing polyvinylpyrrolidone4Solution and NaBH4The volume ratio of solution is 1:
1。
The step 5）In, the Fe0A concentration of 1.0g/L of solution, Fe in the soil0Final concentration of 2.0mg/
kg。
The step 5）In, heavy metal pollution acid soil pH is 4.8-5.6.
The heavy metal is the mixture of cadmium, zinc, lead, chromium, copper or mercury and arbitrary the two or the two or more.
Compared with prior art, advantages of the present invention includes but is not limited to mainly the following aspects：
1）Modified Nano Zero-valent Iron prepared by the present invention can be used for administering remediating heavy metal combined pollution acid soil, operation letter
Just, easy to operate, remediation efficiency is high, and rehabilitation cost is low, and avoids causing secondary pollution to environment, therefore in environment remediation field
It is with a wide range of applications.
2）The present invention is modified nano zero valence iron using polyvinylpyrrolidone as stabilizer, obtained modified Nano
Zero-valent Iron is a kind of good with dispersion performance, and stability and migration are good in the soil, the high material of remediation efficiency.
3）The modified Nano Zero-valent Iron of the present invention is by BH4 -/Fe2+Molar ratio be 3.0 conditions of mixture ratios under prepared,
Make Fe2+Restore All is at Fe0, reaction efficiency height；Secondly, used reagent and equipment are easy to obtain, and prepare easy；Finally,
Product after reaction is that modified nano zero-valence iron particle precipitates, and is easy to detach from solution, it is higher to finally obtain purity
Modified Nano Zero-valent Iron.Compared to other methods, modified Nano Zero-valent Iron dispersibility prepared by the present invention is strong, is not easy to reunite,
Stability and migration in the soil is stronger, can effectively obtain the Compound Heavy Metals in stable soil.
4）The present invention carries out stabilisation reparation to heavy-metal composite pollution acid soil, and remediation efficiency is high, easy to operate easy
Row, rehabilitation cost is low, can be applied in large-scale heavy-metal composite pollution soil.
Description of the drawings
Fig. 1 is the transmission electron microscope picture of unmodified nano zero valence iron；
Fig. 2 is the transmission electron microscope picture of the nano zero valence iron of polyvinyl pyrrolidone modified；
Fig. 3 is curve of adsorption kinetics of the soil to nZVI and P-nZVI.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, having below in conjunction with the application
Body embodiment more clearly and completely describes the present invention, it is clear that described embodiment is only the application one
Divide embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, should all belong to the scope of protection of the invention.
Embodiment 1
Prepare modified Nano Zero-valent Iron：
（1）FeSO4The preparation of solution：Weigh 0.1400gFeSO4·7H2O is placed in beaker, and appropriate ultra-pure water is added, uses glass
Stick stirring and dissolving, and be transferred in 50ml volumetric flasks, it is settled to graduation mark, is shaken up, as 0.01M FeSO4Solution.
（2）FeSO containing polyvinylpyrrolidone4The preparation of solution：0.4g polyvinylpyrrolidones are weighed, in nitrogen
Under conditions of protection and blender stirring, it is allowed to be dissolved in 50ml 0.01M FeSO4In solution, 15min is stirred.
（3）NaBH4The preparation of solution：Weigh 0.0567gNaBH4It is placed in beaker, appropriate ultra-pure water is added, uses glass bar
Stirring and dissolving, and be transferred in 50ml volumetric flasks, it is settled to graduation mark, is shaken up, as 0.03M NaBH4Solution.
（4）Nano zero valence iron（nZVI）Preparation：At room temperature, by the FeSO of 50mL4Solution is placed in 250ml three-necked flasks
In, under conditions of nitrogen protection and blender stir, by the NaBH of 50mL4The rapid uniform speed slow of aqueous solution is added dropwise to three mouthfuls of burnings
In bottle, continues to stir 20min, obtain black suspension.It is filtered by vacuum after standing five minutes, uses ultra-pure water and absolute ethyl alcohol respectively
Washing 3 times, under nitrogen protection, dries 10h in 40 DEG C of baking ovens, dries.
（5）Modified Nano Zero-valent Iron（P-nZVI）Preparation：At room temperature, 50mL is contained into polyvinylpyrrolidone
FeSO4Solution is placed in 250ml three-necked flasks, under conditions of nitrogen protection and blender stir, by the NaBH of 50mL4It is water-soluble
The rapid uniform speed slow of liquid is added dropwise in three-necked flask, is continued to stir 20min, is obtained black suspension.Vacuum after standing five minutes
It filters, is washed 3 times with ultra-pure water and absolute ethyl alcohol respectively, under nitrogen protection, dry 10h in 40 DEG C of baking ovens, dry.
（6）Nano zero valence iron after drying（nZVI）With the nano zero valence iron of polyvinyl pyrrolidone modified（P-nZVI）It can
Be placed in glove box or 5% ethanol solution in preserve.
To the nano zero valence iron in embodiment 1（nZVI）With the nano zero valence iron of polyvinyl pyrrolidone modified（P-nZVI）
Microexamination discovery is carried out, under transmission electron microscope, the form of the nano-iron particle prepared afterwards before modified has very big difference.From figure
1 as can be seen that the nZVI grain diameters prepared are 80-100nm or so, and spherical in shape, whole is in the chain structure that black is reunited.By
The collective effect of magnetostatic power and surface tension between telluric magnetic force, small particles, causes particle to be easy to reunite, so it seems that for group's wadding
Shape.And since nano zero valence iron grain diameter is smaller than the wavelength of visible light, absorbs light wave and become ideal black-body physically.
Fig. 2 shows the nano zero valence iron of polyvinyl pyrrolidone modified（P-nZVI）Grain size is in 15nm or so, even particle distribution, particle
Size is far smaller than nZVI, and with preferable dispersibility, has coating film in outer layer, can prevent nano zero-valence iron particle from oxygen occurs
Change, effectively improves nano zero valence iron and be oxidized easily and the problem of particle agglomeration, and particle is smaller, has the ratio table increased
Area is conducive to stabilisation efficiency of the nano zero valence iron to heavy metal in soil.
Embodiment 2
Investigate the nano zero valence iron of polyvinyl pyrrolidone modified（P-nZVI）It is steady in heavy-metal composite pollution acid soil
It is qualitative.
Heavy-metal composite pollution acid soil is pre-processed, specific pre-treatment step is：
1, heavy-metal composite pollution acid soil is placed on well-ventilated, clean and tidy, dustless, without effumability chemical substance room
It air-dries；
2, it by the heavy-metal composite pollution acid soil after air-drying, is ground with mallet, wood rolling and poly (methyl methacrylate) plate, crosses 2mm
Nylon mesh completes the pretreatment of soil.
The step of stability study is：
（1）Fe0The preparation of solution：Weigh the nano zero valence iron of certain mass（nZVI）, polyvinyl pyrrolidone modified nanometer
Zero-valent Iron iron（P-nZVI）It is respectively dissolved in ultrasound 3min in the pure water of removal oxygen and obtains nZVI solution As 1, P-nZVI solution As 2,
Fe in A1 and A20A concentration of 1.0g/L.
（2）Respectively at addition 12g sieving heavy-metal composite pollution acid soils in 100mL centrifuge tubes, and 63mL is added and goes
Ionized water stands 14 days at room temperature.
（3）93% supernatant is replaced with to the A1 of same volume, A2（Fe=0.5g/L）, it is subsequently placed into shaking table oscillation 70h.
In 1h, 5h, 10h, 20h, 40h, when 60h, 400g centrifuges 10min, and free nano zero valence iron is detached with soil, is taken on 1mL
Clear liquid.
（4）1mL supernatants, the HCl that a concentration of 12M of 4ml are added are cleared up, and Fe contents are measured with ICP-MS, and
The nZVI and P-nZVI adsorbed by solid phase of soil is obtained by calculation.
From figure 3, it can be seen that the nano zero valence iron iron of polyvinyl pyrrolidone modified（P-nZVI）It is more compound than in heavy metal
The stability in acid soil is polluted far better than nano zero valence iron（nZVI）.As time increases, nano zero valence iron is added
（nZVI）, polyvinyl pyrrolidone modified nano zero valence iron iron（P-nZVI）Stabilization processes after, adsorbed by solid phase of soil
Fe contents constantly increasing.Wherein nZVI, it is very fast to the rate of adsorption of Fe in initial 0-10h soil, with the time
Increase, the rate of adsorption gradually slows down, and nZVI tends to be balanced in 40h, is far longer than P- by the amount of solid phase of soil absorption when 60h
nZVI.P-nZVI is not easy to be adsorbed by solid phase of soil, and in 1h, only 19.7% P-nZVI is reached by adsorption by soil in 20h
To balance, the ratio adsorbed is 74.1%, is 77.9% in 60h.
Embodiment 3
Investigate the nano zero valence iron of polyvinyl pyrrolidone modified（P-nZVI）Moving in heavy-metal composite pollution acid soil
Shifting property.
Heavy-metal composite pollution acid soil is pre-processed, specific pre-treatment step is：
1, heavy-metal composite pollution acid soil is placed on well-ventilated, clean and tidy, dustless, without effumability chemical substance room
It air-dries；
2, it by the heavy-metal composite pollution acid soil after air-drying, is ground with mallet, wood rolling and poly (methyl methacrylate) plate, crosses 2mm
Nylon mesh completes the pretreatment of soil.
Migrate Journal of Sex Research the step of be：
（1）Fe0The preparation of solution：Weigh the nano zero valence iron of certain mass（nZVI）, polyvinyl pyrrolidone modified nanometer
Zero-valent Iron iron（P-nZVI）It is respectively dissolved in ultrasound 3min in the pure water of removal oxygen and obtains nZVI solution As 1, P-nZVI solution As 2,
Fe in A1 and A20A concentration of 1.0g/L.
（2）9g is taken to be filled in the plexiglas column of diameter 1.0cm, long 10cm respectively heavy-metal composite pollution acid soil
It is interior.
（3）By the A1 of same volume, A2 solution and ultra-pure water are noted with the speed of 0.18mL/min from earth pillar top respectively
Enter, a pipe is collected per 5ml, collects three pipes and penetrate liquid.
（4）Liquid is penetrated through 0.22 μm of membrane filtration, 0.1MHCl is added, with gas ions-mass spectrograph（ICP-MS）Fe is carried out to contain
The measurement of amount.
As it can be seen from table 1 A1 and the A2 significant difference compared with ultra-pure water, A1 penetrates the Fe contents in liquid with injection
Time and reduce, this shows that the nano iron particles in nZVI are inhaled with the injection of liquid by heavy-metal composite pollution acid soil
Attached, migration is poor.And compared with nZVI, migrations of the P-nZVI in the soil is better than nZIV, has significantly with other processing
Difference, but migrate more with the increase of the liquid of injection, from I-stage to the Section III stage, penetrate the Fe contents point in liquid
It Wei not 152.7,295.2 and 595.5mg/L.The reason is that the aobvious acidity of the pH of soil, and PVP is a kind of nonionic macromolecule chemical combination
Object, has a very strong hydrophily, and the positive and negative charge of institute's band does not have an electrostatic interaction in modified P-nZVI and soil S1, thus its
There is preferably transfer ability in soil.
Table 1
Embodiment 4
Investigate the nano zero valence iron of polyvinyl pyrrolidone modified（P-nZVI）Stablize in heavy-metal composite pollution acid soil
Change efficiency.
Heavy-metal composite pollution acid soil is pre-processed, specific pre-treatment step is：
1, heavy-metal composite pollution acid soil is placed on well-ventilated, clean and tidy, dustless, without effumability chemical substance room
It air-dries；
2, it by the heavy-metal composite pollution acid soil after air-drying, is ground with mallet, wood rolling and poly (methyl methacrylate) plate, crosses 2mm
Nylon mesh completes the pretreatment of soil.
3, heavy-metal composite pollution acid soil pH is 4.9, soil organism 3.6g/kg, and cation exchange capacity (CEC) is
6.38cmol/kg, soil texture sand grain content are 18%, powder 59%, clay 23%.Heavy-metal composite pollution acid after measured
Property zinc content in soil be 1830mg/kg, lead content 749mg/kg, chromium content 703mg/kg, copper content 324mg/kg.
Stabilize efficient studies the step of be：
（1）Fe0The preparation of solution：Weigh the nano zero valence iron of certain mass（nZVI）, polyvinyl pyrrolidone modified nanometer
Zero-valent Iron iron（P-nZVI）It is respectively dissolved in ultrasound 3min in the pure water of removal oxygen and obtains nZVI solution As 1, P-nZVI solution As 2,
Fe in A1 and A20A concentration of 1.0g/L.
（2）The heavy-metal composite pollution acid soil that 2mm is sieved is crossed respectively at respectively weighing 500g in 1L polytetrafluoroethylene (PTFE) bottles,
It is separately added into the Fe a concentration of A1 and A2 and ultra-pure water of different volumes, the Fe of nZVI in soil0Concentration is respectively 0.5mg/kg,
1.0mg/kg, 2.0mg/kg, respectively B1, B2, B3；The Fe of P-nZVI in soil0Concentration is respectively 0.5mg/kg, 1.0mg/
Kg, 2.0mg/kg, respectively C1, C2 and C3.Horizontal oscillations 12h after sealing.
（3）At ambient temperature balance 14 days, 40 DEG C drying 12 hours after grind.
（4）It accurately weighs each 3.5g of sample B1, B2, B3, C1, C2, C3 to be respectively placed in 50mL polyethylene bottles, by solid-to-liquid ratio
1:20 are added leaching liquor（60% H2SO4+ 40% HNO3, pH3.0 ± 0.2）It is vertically fixed on turn-over type vibrator, with
The speed of 30 ± 2rpm vibrates 24 hours at normal temperatures.
（5）It by the filtration system equipped with 0.45 μm of filter membrane, is filtered by suction with vacuum pump, filtrate is collected, with gas ions-matter
Spectrometer（ICP-MS）Measure content of beary metal.
（6）The Leaching of heavy metal is indicated with leaching coefficient：
Leaching coefficient=×100% （5.1）
It is and super from Table 2, it can be seen that after nano zero valence iron and the nano zero valence iron of polyvinyl pyrrolidone modified stabilize
Pure water compares B1, B2, B3, C1, C2, and C3 processing significantly reduces the leaching content of four heavy metal species in soil, and C1,
C2, C3 are better than the B1 of same concentration, B2, B3.After P-nZVI is handled, the Leaching of heavy metal in soil Zn significantly drops
Low, compared with ultra-pure water, Leaching reduces by 66.48% ~ 90.06% respectively.For Heavy Metals in Contaminated Soils Cr, through P-nZVI
There is no Cr leachings after processing, in soil.For heavy metal Pb, compared with ultra-pure water, Leaching is distinguished after P-nZVI is handled
Reduce by 88.61% ~ 99%.For polluted heavy metals Cu, after P-nZVI is handled, Cu is not detected in C2 and C3.Illustrate, through polyethylene
After pyrrolidone modified nano zero valence iron stabilizes, the stabilization effect of the heavy metal in heavy-metal composite pollution acid soil
Far better than unmodified nano zero valence iron.
Table 2
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specific example " or
The description of " some examples " etc. means that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example include
In at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms necessarily needle
To be identical embodiment or example.Although the embodiments of the present invention has been shown and described above, it is to be understood that
Above-described embodiment is exemplary, and is not considered as limiting the invention, and those skilled in the art are the present invention's
It can make changes, modifications, alterations, and variations to the above described embodiments in range.
Claims (7)
1. using the method for modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil, include the following steps：Step 1）
FeSO4The preparation of solution, step 2）FeSO containing polyvinylpyrrolidone4The preparation of solution, step 3）NaBH4The system of solution
It is standby, step 4）The preparation of modified Nano Zero-valent Iron, step 5）It stirs evenly, step 6）Stabilization processes.
2. according to the method described in claim 1, it is characterized in that, described method includes following steps：
Step 1）FeSO4The preparation of solution：Take FeSO4·7H2O is placed in container, and appropriate ultra-pure water is added, is stirred with glass bar
Dissolving, shakes up, and the FeSO of 0.01M is made4Solution；
Step 2）FeSO containing polyvinylpyrrolidone4The preparation of solution：Polyvinylpyrrolidone is taken, in nitrogen protection and is stirred
Under conditions of mixing device stirring, it is allowed to be dissolved in 0.01M FeSO4In solution, 15min is stirred；
Step 3）NaBH4The preparation of solution：Take NaBH4It is placed in container, appropriate ultra-pure water is added, stirring and dissolving shakes up, and is made
The NaBH of 0.03M4Solution；
Step 4）The preparation of modified Nano Zero-valent Iron：By step 2）FeSO of the gained containing polyvinylpyrrolidone4Solution is placed in appearance
In device, under conditions of nitrogen protection and blender stir, by step 3）Gained NaBH4Solution is slowly dropped in container, after
Continuous stirring 20min, is filtered by vacuum after standing five minutes, washs, under nitrogen protection, dried in baking oven；
Step 5）It stirs evenly：Toward step 4）Modified Nano zero-valent iron particle in ultra-pure water is added, stir, Fe is made0Solution,
Then by Fe0Solution is added in heavy metal pollution acid soil, is used in combination water that soil moisture is made to be saturated, and is then stirred evenly；
Step 6）Stabilization processes：The heavy metal pollution acid soil that will be stirred evenly is placed on draughty position, processing
14-21 days.
3. according to the method described in claim 2, it is characterized in that, the step 2）In, the polyvinylpyrrolidone and
0.01M FeSO4The ratio of solution is 8g：1L.
4. according to the method described in claim 2, it is characterized in that, the step 4）In, it is described to contain polyvinylpyrrolidone
FeSO4Solution and NaBH4The volume ratio of solution is 1:1.
5. according to the method described in claim 2, it is characterized in that, the step 5）In, the Fe0A concentration of 1.0g/ of solution
L, Fe in the soil0Final concentration of 2.0mg/kg.
6. according to the method described in claim 2, it is characterized in that, the step 5）In, heavy metal pollution acid soil pH is
4.8-5.6。
7. according to the method described in claim 2, it is characterized in that, the heavy metal is cadmium, zinc, lead, chromium, copper or mercury and appoints
Mixture more than both meanings or the two.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710106629 | 2017-02-27 | ||
| CN2017101066298 | 2017-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108372198A true CN108372198A (en) | 2018-08-07 |
Family
ID=63017459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810120239.0A Pending CN108372198A (en) | 2017-02-27 | 2018-02-07 | Utilize the method for modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108372198A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231782A (en) * | 2018-10-17 | 2019-01-18 | 桂林理工大学 | The minimizing stabilization treatment method of Cd in a kind of municipal sludge |
| CN109351767A (en) * | 2018-10-19 | 2019-02-19 | 华南理工大学 | A kind of method of superfine iron powder collaboration microorganism remediation chromium-polluted soil |
| CN114686240A (en) * | 2022-03-28 | 2022-07-01 | 浙江卓锦环保科技股份有限公司 | Reducing agent for heavy metal contaminated soil and use method thereof |
| CN116477793A (en) * | 2023-04-22 | 2023-07-25 | 同济大学 | Method for removing high nitrate groundwater by low-pressure reverse osmosis method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1876294A (en) * | 2006-07-03 | 2006-12-13 | 南京大学 | Method for preparing nanometer zero-valent iron grain using improved liquid phase reduction method |
| CN102380505A (en) * | 2011-08-08 | 2012-03-21 | 同济大学 | Method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI) |
| CN104478004A (en) * | 2014-12-31 | 2015-04-01 | 湖南大学 | Modified FeS nano-particle as well as preparation method and application thereof |
| CN105458283A (en) * | 2015-11-24 | 2016-04-06 | 太原理工大学 | Method for green synthesis of nanometer zero-valent iron-copper bi-metal material and application |
| CN106180735A (en) * | 2016-08-19 | 2016-12-07 | 环境保护部环境规划院 | The preparation of a kind of Modified Micron Zero-valent Iron and the application process in heavy metal pollution of soil is repaired thereof |
-
2018
- 2018-02-07 CN CN201810120239.0A patent/CN108372198A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1876294A (en) * | 2006-07-03 | 2006-12-13 | 南京大学 | Method for preparing nanometer zero-valent iron grain using improved liquid phase reduction method |
| CN102380505A (en) * | 2011-08-08 | 2012-03-21 | 同济大学 | Method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI) |
| CN104478004A (en) * | 2014-12-31 | 2015-04-01 | 湖南大学 | Modified FeS nano-particle as well as preparation method and application thereof |
| CN105458283A (en) * | 2015-11-24 | 2016-04-06 | 太原理工大学 | Method for green synthesis of nanometer zero-valent iron-copper bi-metal material and application |
| CN106180735A (en) * | 2016-08-19 | 2016-12-07 | 环境保护部环境规划院 | The preparation of a kind of Modified Micron Zero-valent Iron and the application process in heavy metal pollution of soil is repaired thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231782A (en) * | 2018-10-17 | 2019-01-18 | 桂林理工大学 | The minimizing stabilization treatment method of Cd in a kind of municipal sludge |
| CN109351767A (en) * | 2018-10-19 | 2019-02-19 | 华南理工大学 | A kind of method of superfine iron powder collaboration microorganism remediation chromium-polluted soil |
| CN114686240A (en) * | 2022-03-28 | 2022-07-01 | 浙江卓锦环保科技股份有限公司 | Reducing agent for heavy metal contaminated soil and use method thereof |
| CN116477793A (en) * | 2023-04-22 | 2023-07-25 | 同济大学 | Method for removing high nitrate groundwater by low-pressure reverse osmosis method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Qu et al. | Effective lead passivation in soil by bone char/CMC-stabilized FeS composite loading with phosphate-solubilizing bacteria | |
| CN106825013A (en) | Using the method for modified Nano Zero-valent Iron heavy metal contaminated soil stabilization processes | |
| CN108372198A (en) | Utilize the method for modified Nano Zero-valent Iron remediating heavy metal combined pollution acid soil | |
| CN108246794A (en) | Improve method of the nano zero valence iron in heavy-metal composite pollution soil stabilization efficiency | |
| Yang et al. | Simultaneous adsorption of Cd (II) and As (III) by a novel biochar-supported nanoscale zero-valent iron in aqueous systems | |
| Ramanayaka et al. | Performance of metal–organic frameworks for the adsorptive removal of potentially toxic elements in a water system: a critical review | |
| Zhou et al. | Zero-valent iron nanoparticles supported by functionalized waste rock wool for efficient removal of hexavalent chromium | |
| CN105013811B (en) | A kind of preparation and application of heavy metal chromium pollution soil remediation material | |
| CN105709699B (en) | A kind of soil heavy mental adsorbent and preparation method thereof | |
| Sharma et al. | Fabrication, characterization and antimicrobial activity of polyaniline Th (IV) tungstomolybdophosphate nanocomposite material: efficient removal of toxic metal ions from water | |
| Zhou et al. | Biochar-supported zerovalent iron for removal of various contaminants from aqueous solutions | |
| CN109289789B (en) | Preparation method of composite hydrogel for heavy metal ion adsorption and detection | |
| Hua et al. | Effective removal of mercury ions in aqueous solutions: A review | |
| CN110076185A (en) | A kind of method of remediating heavy metal and polycyclic aromatic hydrocarbon composite pollution soil | |
| Wang et al. | Exploratory of immobilization remediation of hydroxyapatite (HAP) on lead-contaminated soils | |
| CN105016630B (en) | The sulfydryl grafting repaired for soil pollution and the preparation method of the resurrection glass fibre of photocatalyst | |
| Wei et al. | Fabrication of di-selective adsorption platform based on deep eutectic solvent stabilized magnetic polydopamine: Achieving di-selectivity conversion through adding CaCl2 | |
| CN109320736A (en) | The difunctional amorphous FeMn-MOF-74 nanometers of floral material of one kind and preparation method and application | |
| CN109967508A (en) | A kind of method and in-situ remediation method of dispersing agent modified synthesis nano zero valence iron | |
| CN107303586B (en) | A kind of in-situ remediation method of heavy-metal contaminated soil | |
| Lu et al. | Magnetic MXene based metal organic frameworks composites: synthesis, characterization and application | |
| Yari Moghaddam et al. | Adsorption of Cd and Ni from water by graphene oxide and graphene oxide–almond shell composite | |
| Asnaoui et al. | Study of the kinetics and the adsorption isotherm of cadmium (II) from aqueous solution using green algae (Ulva lactuca) biomass | |
| Dave et al. | Copper remediation by Eichhornia spp. and sulphate-reducing bacteria | |
| Saritha | A concise review on the removal of heavy metals from wastewater using adsorbents |
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 | ||
| CB02 | Change of applicant information |
Address after: Xuanwu District of Nanjing City, Jiangsu province 210042 Jiang Wang Temple Street No. 8 Applicant after: NANJING INSTITUTE OF ENVIRONMENTAL SCIENCES, MEE Address before: Xuanwu District of Nanjing City, Jiangsu province 210042 Jiang Wang Temple Street No. 8 Applicant before: NANJING INSTITUTE OF ENVIRONMENTAL SCIENCES, MEP |
|
| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180807 |
|
| RJ01 | Rejection of invention patent application after publication |