CN109967023A - It is a kind of that green tea extractive liquor synthesis nano zero valence iron and in-situ remediation method is reversely added dropwise - Google Patents
It is a kind of that green tea extractive liquor synthesis nano zero valence iron and in-situ remediation method is reversely added dropwise Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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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
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/08—Nanoparticles or nanotubes
Abstract
The present invention relates to a kind of reversed green tea extractive liquors that is added dropwise to synthesize nano zero valence iron and in-situ remediation method.It specifically includes that and prepares green tea extractive liquor, prepare iron salt solutions, in nitrogen atmosphere, green tea extractive liquor is added dropwise in iron salt solutions, after solution stirring, obtain nano zero valence iron suspension, it is spare.Nano zero valence iron suspension is centrifuged, nano zero valence iron solid is obtained, will be dried in vacuo after nano zero valence iron solid cleaning, after dry, after ground sieving, obtain nano zero-valence iron particle.Nano zero-valence iron particle made from the above method can efficiently remove the heavy metals such as chromium in sewage.And the suspension stability of nano zero-valence iron particle made from the above method is preferable, the mobility in porous media is higher.It can be used for the contaminated soil and groundwater of in-situ immobilization.
Description
Technical field
The present invention relates to nano material preparations and restoration of soil polluted by heavy metal and Field of Groundwater Study, more particularly to one kind
It is reversed that green tea extractive liquor synthesis nano zero valence iron and method for treating water is added dropwise.
Background technique
Nano zero valence iron mean particle size is small, and active site is high, and reproducibility is strong, goes all kinds of difficulties in water removal in catalysis reduction
The application of degradation of contaminant and heavy metal above has important breakthrough, thus is more paid close attention to.Traditional nano zero-valence iron particle
It is by chemically or physically preparing, seems liquid phase reduction, it is molten using sodium borohydride and ferric sulfate or iron chloride
Liquid reaction, is reduced into zeroth order for divalent or ferric ion；There are also more quick physics electrolysis method etc..But these methods have
Limitation, preparation process energy consumption is high and needs using the chemical substance for having secondary pollution to environment.In addition, traditional synthesis side
The nano particle that method is prepared is easy to reunite, is unfavorable for further removing and repairs pollutant.
In recent years, it has been reported that research makees reducing agent green syt nano zero valence iron using plant extracts, effectively improves
The reactivity of nano zero valence iron.But the solution suspension stability of nano zero-valence iron particle that these methods synthesize compares
Difference is unfavorable for the in-situ immobilization of the soil and groundwater of heavy metal pollution, it usually needs further modified Nano Zero-valent Iron mentions
High solution suspension stability.It more results in migration of the nano zero valence iron in porous media to be affected, this just gives in-situ immobilization
Water pollution brings obstruction.There are certain unfavorable factors, such as gravity to imitate for migratory movement of the nano particle under aqueous solution background
Should and concentration effect, gravitational effect cause nano zero valence iron suspension to settle rapidly under the effect of gravity；Concentration effect causes to receive
Rice Zero-valent Iron suspension bypasses low concentration permeable areas, preferentially enters high concentration permeable areas, causes actually administering water body dirt
It cannot get a desired effect when dye, in some instances it may even be possible to can be because the stranded belt of nano zero-valence iron particle carrys out other harm.
Summary of the invention
Based on this, it is necessary to lower to the removal amount to sewage heavy metal for the nano zero valence iron of conventional method preparation
Problem provides a kind of reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise.
A kind of reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise, comprising the following steps:
S100, it prepares green tea extractive liquor: the tealeaves of green tea being added in deionized deoxygenated water, the water-bath under air-proof condition,
It stands, is filtered by vacuum after fluid temperature is cooled to room temperature after the water bath is over, obtain green tea extractive liquor, it is spare；
S200, iron salt solutions are prepared: soluble trivalent iron salt or soluble divalent iron salt is dissolved into deionized deoxygenated water
In, iron salt solutions are obtained, it is spare；
S300, it prepares nano zero valence iron: in nitrogen atmosphere, green tea extractive liquor being added dropwise in iron salt solutions, to molten
After liquid stirring, nano zero valence iron suspension is obtained, it is spare；
S400, it obtains nano zero-valence iron particle: nano zero valence iron suspension is centrifuged, obtain nano zero valence iron
Solid will be dried in vacuo after nano zero valence iron solid cleaning, after dry, after ground sieving, obtain nano zero-valence
Iron particle.
Nano zero-valence iron particle made from the above method can efficiently remove the heavy metals such as chromium in sewage.And it is above-mentioned
The suspension stability of nano zero-valence iron particle made from method is preferable, and the mobility in porous media is higher.
In one of the embodiments, in the step S100, the water-bath under air-proof condition, the temperature of water-bath is 80 DEG C,
The time of water-bath is 30-60min.
In one of the embodiments, in the step S100, the tealeaves by green tea is added in deionized deoxygenated water,
Be to be added according to following proportion: the tea amount that green tea is added in every 1L deionized deoxygenated water is 60g.
It is that ferric sulfate hydrate is added in deionized deoxygenated water in one of the embodiments, in the step S200,
And be added according to following proportion, 16g ferric sulfate hydrate is added in every 1L deionized deoxygenated water, and ferric sulfate hydrate is added to de-
Water-bath is carried out after in oxygen deionized water, bath temperature is 60 DEG C, water bath time 10min.
It is that green tea extractive liquor is added dropwise under the conditions of 30 DEG C in one of the embodiments, in the step S300
It is 30min to solution mixing time into iron salt solutions.
In one of the embodiments, in the step S400, described clean the nano zero valence iron solid is to use nothing
Water-ethanol washs three times, and drying temperature is 50 DEG C, drying time 12h, polished 100 mesh of mistake.
A kind of in-situ remediation method prepares nano zero-valence iron particle according to the above method, uses the nano zero valence iron
The soil and groundwater of granule in-situ repairing heavy metal pollution.
Detailed description of the invention
Fig. 1 is that nano zero-valence is added dropwise by the way that synthesis nano zero valence iron and forward direction is reversely added dropwise in the method for the embodiment of the present invention
The XRD diffraction pattern of iron.
Fig. 2 is that the method for the embodiment of the present invention is schemed by the way that the transmission electron microscope TEM of synthesis nano zero valence iron is reversely added dropwise.
Fig. 3 is the method for the embodiment of the present invention by the way that synthesis nano zero valence iron is reversely added dropwise when pH is 6 different dense
Spend the sedimentation stability figure under NaCl (0.1mM, 1mM, 10mM) background liquid.
Fig. 4 is that the method for the embodiment of the present invention by the way that synthesis nano zero valence iron is reversely added dropwise in pH is 6, and background liquid is
Sedimentation stability comparison diagram when 10mM NaCl.
Fig. 5 is the method for the embodiment of the present invention by the way that synthesis nano zero valence iron is reversely added dropwise in 1mM, 10mM NaCl, pH
Migration breakthrough curve when being 6.
Fig. 6 is the method for the embodiment of the present invention by the way that synthesis nano zero valence iron is reversely added dropwise in 1mM, 10mM NaCl, pH
Retention curve when being 6.
Fig. 7 is that the method for the embodiment of the present invention by the way that synthesis nano zero valence iron is reversely added dropwise in pH is 6, and background liquid is
To the removal amount of different initial concentration Cr VIs (25,50,75,100,125,150,175,200mg/L) under 10mM NaCl.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
The embodiment provides a kind of reversed methods that green tea extractive liquor synthesis nano zero valence iron is added dropwise, including with
Lower step:
S100, it prepares green tea extractive liquor: the tealeaves of green tea being added in deionized deoxygenated water, the water-bath under air-proof condition,
It stands, is filtered by vacuum after fluid temperature is cooled to room temperature after the water bath is over, obtain green tea extractive liquor, it is spare；
S200, iron salt solutions are prepared: soluble trivalent iron salt or soluble divalent iron salt is dissolved into deionized deoxygenated water
In, iron salt solutions are obtained, it is spare；
S300, it prepares nano zero valence iron: in nitrogen atmosphere, green tea extractive liquor being added dropwise in iron salt solutions, to molten
After liquid stirring, nano zero valence iron suspension is obtained, it is spare；
S400, it obtains nano zero-valence iron particle: nano zero valence iron suspension is centrifuged, obtain nano zero valence iron
Solid will be dried in vacuo after nano zero valence iron solid cleaning, after dry, after ground sieving, obtain nano zero-valence
Iron particle.
Nano zero-valence iron particle made from the above method can carry out the soil and groundwater of heavy metal pollution effective former
Position is repaired, and the heavy metals such as the chromium in sewage are efficiently removed.And the above method is simple and easy to get, obtained nano zero valence iron particle reduction
Property it is high, suspension stability is good, and the mobility in porous media is higher.
This is because, traditional green tea extractive liquor synthesis nano zero valence iron be tea polyphenols are added to divalent or ferric iron from
Reduction reaction is carried out in son, but this method cannot allow the effect of tea polyphenols reducing agent to play completely.The present invention be by iron from
Son is added dropwise in reducing agent tea polyphenols, iron ion efficiently, fully can be reduced into Zero-valent Iron, be made zeroth order ferrous components more
Merely.
Synthesis is added dropwise compared to forward direction, nano zero valence iron reactivity made of reversed dropwise addition of the invention is high, adsorption energy
Power is strong, and in going water removal during heavy metal, reaction rate is fast, reversed that system is added dropwise especially when heavy metal concentration is higher
At the removal effect of nano zero valence iron be substantially better than nano zero valence iron made of positive be added dropwise.
In the present embodiment, in the step S100, the water-bath under air-proof condition, the temperature of water-bath is 80 DEG C, water-bath when
Between be 30-60min.Such as it can be with 30min, 50min, 60min etc..
In the present embodiment, in the step S100, the tealeaves by green tea is added in deionized deoxygenated water, be according to
Proportion is added below: the tea amount that green tea is added in every 1L deionized deoxygenated water is 60g.
In the present embodiment, in the step S200, be ferric sulfate hydrate is added in deionized deoxygenated water, and according to
Lower proportion is added, and 16g ferric sulfate hydrate is added in every 1L deionized deoxygenated water, and ferric sulfate hydrate is added to deoxidation deionization
Water-bath is carried out after in water, bath temperature is 60 DEG C, water bath time 10min.
It is that it is molten that green tea extractive liquor is added dropwise to molysite under the conditions of 30 DEG C in the step S300 in the present embodiment
It is 30min to solution mixing time in liquid.
In the present embodiment, in the step S400, described clean the nano zero valence iron solid is washed with dehydrated alcohol
It washs three times, drying temperature is 50 DEG C, drying time 12h, polished to sieve with 100 mesh sieve.
The embodiments of the present invention also provide a kind of in-situ remediation methods, first prepare nanometer according to the above method of the present invention
Zero-valent iron particle uses the soil and groundwater of the nano zero valence iron particle in-situ repairing heavy metal pollution.
When in-situ immobilization soil, nano zero-valence iron particle prepared by the above method of the invention can be directly sprinkling upon pollution
On soil, under the sourings such as rainwater, nano zero-valence iron particle can enter soil and migrate, and then carry out to contaminated soil
It repairs.Repair the heavy metal mainly removed by the combined adsorption and entrapment of nano zero valence iron in soil.It is of course also possible to by upper
The nano zero-valence iron particle for stating method preparation is made suspension and then is sprinkling upon in contaminated soil.
When in-situ remediation of underground water, drainage canal can be built, makes subsurface flow through draining canal, is put into the present invention in drainage canal
The above method preparation nano zero-valence iron particle or suspension.Underground water is taken out by the combined adsorption and entrapment of nano zero valence iron
In heavy metal.
The above method is described in further detail below by way of specific example.
Prepare nano zero-valence iron particle:
It allows deionized water to keep 10min under logical N2 atmosphere, prepares deionized deoxygenated water.Deoxidation is added in the tealeaves of green tea
In deionized water, match as follows: the tea amount that green tea is added in every 1L deionized deoxygenated water is 60 g.Under air-proof condition, 80
DEG C heating water bath 30min, stands after the water bath is over, is filtered by vacuum after fluid temperature is cooled to room temperature, obtain green tea and mention
Liquid is taken, it is spare.Hydrated sulfuric acid iron powder is dissolved in deionized deoxygenated water, is matched as follows: being added in every 1L deionized deoxygenated water
16g ferric sulfate hydrate, and water-bath is carried out after ferric sulfate hydrate is added in deionized deoxygenated water, bath temperature is 60 DEG C, water
The bath time is 10min.In nitrogen atmosphere, green tea extractive liquor is added dropwise in iron salt solutions, fixed speed stirs solution
After 30min, nano zero valence iron suspension is obtained, it is spare.Nano zero valence iron suspension is centrifuged, nanometer zero is obtained
Valence iron solid will be dried in vacuo after nano zero valence iron solid cleaning, after dry, after ground sieving, obtain nanometer
Zero-valent iron particle.The XRD diffraction pattern of nano zero-valence iron particle obtained is amorphous as shown in Fig. 1, it may be possible to because obtained
With the presence of some unbodied organic matters in nano zero-valence iron particle.Transmission electron microscope picture shown in Fig. 2.
Sedimentation experiment:
Sedimentation experiment be at room temperature by nano zero valence iron made of the above method be added NaCl background solution (0.1mM,
1mM and 10mM) in quickly mix.Adjusting pH value of solution is 6.By ultrasonic treatment, then transfer the sample into elongated graduated cylinder
It stands.It is sampled every the set time, with sulfosalicylic acid determination of color iron to analyze suspension stability.As shown in figure 3, nanometer
The Zero-valent Iron rate of settling is very fast, and suspension stability is good, and the organic matter layer of the nano zero-valence iron surface that tends towards stability after 20 min can be with
Slow down the speed of nano zero valence iron oxidation by air, to increase its time for keeping reactivity in reaction medium.
Migration experiment:
Migration experiment is that nano zero valence iron suspension made of the above method (background liquid is NaCl solution, pH=6) exists
It from bottom to top is injected in porous media quartz sand column under the traction of peristaltic pump, flowing velocity, every 2min are run with adjusting peristaltic pump
10ml out collects efflux.Containing nano zero valence iron background liquid changes simple NaCl background liquid into after running through and regathers stream
Liquid out.The migration breakthrough curve of Fig. 5 is obtained with sulfosalicylic acid determination of color iron.Migrate the error in curve display experiment
So that be not perfect " several " font in figure, but rule is it will be evident that manufactured nano zero-valence is reversely added dropwise in the present invention
Migration of the iron in NaCl is influenced less by background liquid concentration, and mobility is all 50% or so.
Adsorption experiment:
Adsorption experiment is to carry out at room temperature, first compound concentration be 1000mg/L chromium stock solution (potassium bichromate
1.4145g is dissolved in 500ml deionized water, using National Standard Method).And then the dilution of above-mentioned solution is configured to the sexavalence of various concentration
Chromium solution.The nano zero valence iron of above method preparation of the present invention is as adsorbent, absorbent concentration 0.5g/L, that is, 1L six
The nano zero valence iron that valence chromium solution is prepared using the 0.5g above method.It is appreciated that being carried out in reality to soil and underground water
When in-situ immobilization, the adsorbent of other concentration also can be used, can select according to the actual situation.By adsorbent with it is above-mentioned each dense
The hexavalent chromium solution of degree mixes, and adjusting pH is 6, is placed on impeller, and reacting balance time is 3 hours.It is then placed in cold
Freeze centrifuge centrifugation, takes supernatant liquid filtering, by diphenyl carbazide spectrophotometry, Cr VI is dense in ultraviolet determination sample
Degree.Supernatant is equally taken to cross 0.45um filter membrane, using the concentration of total chromium in Flame Atomic Absorption Spectrometry instrument measurement sample.It is ultraviolet to measure six
Valence chromium concn is the concentration of trivalent chromium being reduced, and total chromium concn subtracts that be reduced the chromium that trivalent chromium concentration is adsorbed dense
Degree.As a result as shown in Figure 7.
The following are the beneficial effects of above-mentioned each method of the invention, comprising:
1, while iron ion is reduced to Zero-valent Iron as activity reducing agent by the tea polyphenols being rich in green tea extractive liquor, also
Play the role of dispersing agent and stabilizer.
2, it is clear that method and step is reversely added dropwise, it is easy to operate, it can but reach good effect.
3, the nano zero valence iron suspension stability that reversely dropwise addition tea polyphenols synthesize is fine, and the suspensibility in two hours reaches
60%.Mobility in porous media reaches 50% or more.
4, it is stronger that the nano zero valence iron reactivity that tea polyphenols synthesize reversely is added dropwise, Cr VI (25mg/L) is gone
Except rate reaches 95%.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (7)
1. a kind of reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise, it is characterised in that: the following steps are included:
S100, it prepares green tea extractive liquor: the tealeaves of green tea being added in deionized deoxygenated water, the water-bath under air-proof condition, water-bath
After stand, be filtered by vacuum after fluid temperature is cooled to room temperature, obtain green tea extractive liquor, it is spare；
S200, iron salt solutions are prepared: soluble trivalent iron salt or soluble divalent iron salt is dissolved into deionized deoxygenated water, obtained
It is spare to iron salt solutions；
S300, it prepares nano zero valence iron: in nitrogen atmosphere, green tea extractive liquor being added dropwise in iron salt solutions, solution is stirred
After mixing, nano zero valence iron suspension is obtained, it is spare；
S400, it obtains nano zero-valence iron particle: nano zero valence iron suspension is centrifuged, it is solid to obtain nano zero valence iron
Body will be dried in vacuo after nano zero valence iron solid cleaning, after dry, after ground sieving, obtain nano zero valence iron
Particle.
2. the reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise according to claim 1, it is characterised in that: institute
It states in step S100, the water-bath under air-proof condition, the temperature of water-bath is 80 DEG C, and the time of water-bath is 30-60min.
3. the reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise according to claim 1, it is characterised in that: institute
It states in step S100, the tealeaves by green tea is added in deionized deoxygenated water, and be to be added according to following proportion: every 1L deoxidation is gone
The tea amount that green tea is added in ionized water is 60g.
4. the reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise according to claim 1, it is characterised in that: institute
It states in step S200, is that ferric sulfate hydrate is added in deionized deoxygenated water, and is added according to following proportion, every 1L deoxidation is gone
16g ferric sulfate hydrate is added in ionized water, and carries out water-bath, water-bath temperature after ferric sulfate hydrate is added in deionized deoxygenated water
Degree is 60 DEG C, water bath time 10min.
5. the reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise according to claim 1, it is characterised in that: institute
It states in step S300, is that green tea extractive liquor is added dropwise in iron salt solutions under the conditions of 30 DEG C, is to solution mixing time
30min。
6. the reversed method that green tea extractive liquor synthesis nano zero valence iron is added dropwise according to claim 1, it is characterised in that: institute
It states in step S400, described clean the nano zero valence iron solid is washed three times with dehydrated alcohol, and drying temperature is 50 DEG C,
Drying time is 12h, polished to sieve with 100 mesh sieve.
7. a kind of in-situ remediation method, it is characterised in that: method preparation as claimed in any of claims 1 to 6 is received
Rice zero-valent iron particle, uses the soil and groundwater of the nano zero valence iron particle in-situ repairing heavy metal pollution.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526311A (en) * | 2019-09-07 | 2019-12-03 | 中国地质科学院水文地质环境地质研究所 | Utilize the medicament of green tea Nanoscale Iron activation persulfate system renovation of organic pollution aquifer |
| CN110526310A (en) * | 2019-09-07 | 2019-12-03 | 中国地质科学院水文地质环境地质研究所 | Utilize the method for green tea Nanoscale Iron activation persulfate system renovation of organic pollution aquifer |
| CN110975837A (en) * | 2019-12-23 | 2020-04-10 | 重庆大学 | Modified oyster shell, preparation method and application thereof |
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| CN110975837A (en) * | 2019-12-23 | 2020-04-10 | 重庆大学 | Modified oyster shell, preparation method and application thereof |
| CN114042456A (en) * | 2021-12-03 | 2022-02-15 | 浙江工业大学 | Method for preparing Fe-based catalyst by using biomass as raw material and application of Fe-based catalyst |
| CN114042456B (en) * | 2021-12-03 | 2023-11-10 | 浙江工业大学 | Method for preparing Fe-based catalyst by taking biomass as raw material and application of Fe-based catalyst |
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