CN110015741A - A method of water pollutant is removed using nano zero valence iron and ferrate compound action - Google Patents
A method of water pollutant is removed using nano zero valence iron and ferrate compound action Download PDFInfo
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- CN110015741A CN110015741A CN201910350289.2A CN201910350289A CN110015741A CN 110015741 A CN110015741 A CN 110015741A CN 201910350289 A CN201910350289 A CN 201910350289A CN 110015741 A CN110015741 A CN 110015741A
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- nano zero
- zero valence
- valence iron
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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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2305/02—Specific form of oxidant
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
A method of water pollutant is removed using nano zero valence iron and ferrate compound action, the present invention relates to a kind of method for treating water, it is poor removal effect when solving the pollutant in ferrate processing water, and total organic matter removal efficiency is low, and big problem is measured in medicament throwing.Method for treating water: one, throwing nano zero valence iron into staying water, obtains the water body containing nano zero valence iron；Two, the water body containing nano zero valence iron is stirred, while ferrate is added and is reacted；Three, to after reaction, to treated water body filtration, the removal of pollutant in water body is completed.The present invention can make the removal rate of Typical Organic Pollutants in the water of source up to 80% or more using nano zero valence iron and ferrate compound action, TOC removal rate is up to 60% or more, or COD content in sewage is set to reduce by 60%~90%, or make the removal rate of the heavy metal contaminants such as lead, arsenic, thallium, cadmium up to 80% or more.
Description
Technical field
The present invention relates to a kind of method for treating water, and in particular to a kind of to utilize nano zero valence iron and ferrate compound action
The method for removing water pollutant.
Background technique
It, can only when removing the organic pollutant in water body with certain selectivity when ferrate is reacted with organic matter
Selectively oxidized portion organic pollutant (such as organic matter of sulfur-bearing nitrogen-containing group), with benzoic acid, nitrophenols etc. containing relatively full
It is relatively poor with the reactivity of the organic matter of chemical bond, thus there are persistent pollutant removal rate is low, medicament throwing amount is high
Problem.And when organic pollutant in ferrate oxidation degradation water body, it is capable of the molecular structure of effectively conversion pollutant
(be degraded to small molecule or polymerization reaction occurs and generate macromolecular substances) and reduce its bio-toxicity, but its most oxidation
Product still preservation is in water body.On the one hand, partially in the form of small molecule existing for oxidation product be easy to by life micro- in water body
Object consumption utilizes, therefore affects the biological stability of water body；On the other hand, partial oxidation products are likely to be disinfection by-products
Predecessor, thus will lead to the formation of a large amount of disinfection by-products during Water Disinfection.Therefore, strengthen the oxygen of ferrate
Change effect and be effectively removed remaining organic matter in water body and the raising of water quality and water quality stability is of great significance.
Nano zero valence iron reduction activation is very strong, and unstable chemcial property is easily oxidized.Although nano zero valence iron is in environment dirt
Preferable effect is achieved in terms of the removal for contaminating object, but mainly by surface reflex action approach come degradating chloro organic pollutant
Nano zero valence iron, removal efficiency limited by Zero-valent Iron mass transfer ability, and Nanoscale Iron and hydrophobic organic compound be not in liquid phase
It is low and be difficult to play one's part to the full that same polarity will lead to electron transfer efficiency between Zero-valent Iron and pollutant.For certain pollutants,
Especially persistence organic pollutant, nano zero valence iron, which is used alone, can not obtain satisfied effect, or even in degradation process
It is middle to be converted into the bigger pollutant of toxicity.
Summary of the invention
Poor removal effect when handling the pollutant in water present invention aim to address ferrate, total organic matter removal effect
Rate is low, and big problem is measured in medicament throwing, and provide it is a kind of using nano zero valence iron and ferrate compound action go to remove water in pollute
The method of object.
The present invention is followed these steps using the method for nano zero valence iron and ferrate compound action removal water pollutant
It realizes:
One, nano zero valence iron is thrown into staying water, obtains the water body containing nano zero valence iron；
Two, (quick) water body of the stirring containing nano zero valence iron, while ferrate is added and is reacted；
Three, to after reaction, to treated water body filtration, the removal of pollutant in water body is completed.
The present invention includes following having using the method for nano zero valence iron and ferrate compound action removal water pollutant
Beneficial effect:
(1) ferrate and iron-oxo species-ferrous iron that reproducibility can be generated when nano zero valence iron compound action, and
Ferrate selfdecomposition and hydrogen peroxide can be generated after reacting with reducing agent, utilize reacting for ferrous iron and hydrogen peroxide, system
It is interior to generate the stronger hydroxyl radical free radical of reactivity；
(2) ferrate and when nano zero valence iron compound action, can generate oxidisability and the stronger intermediate valence state of reactivity
Iron-tetravalence and pentavalent iron；
(3) ferrate selfdecomposition and while reacting with reducing agent, can generate a large amount of dissolved oxygen, and nano zero valence iron with it is molten
Solution oxygen reaction will form the Strong oxdiatives species such as hydroxyl radical free radical, singlet oxygen after electronics transfer occurs；
(4) ferrate and when nano zero valence iron compound action, can generate that a large amount of partial size is small, hydrated sheath is thin, dispersion in situ
Property good, large specific surface area and surface be rich in hydroxy functional group nano-level iron oxide；
(5) the nano-level iron oxide that nano zero valence iron and ferrate compound action generate in situ is to heavy metal and organic
Pollutant all has stronger adsorption capacity；
(6) removal rate of Typical Organic Pollutants in the water of source can be made using nano zero valence iron and ferrate compound action
Up to 80% or more, TOC removal rate up to 60% or more, or COD content is made in sewage to reduce by 60%~90%, or make lead, arsenic, thallium,
The removal rate of the heavy metal contaminants such as cadmium is up to 80% or more.Depollution is removed using the nano zero valence iron and ferrate compound action
The method of object can make the removal rate of pollutant improve 30%~70%, and the dosage of ferrate is made to reduce 20%~60%.
Specific embodiment
Specific embodiment 1: present embodiment goes in water removal to pollute using nano zero valence iron with ferrate compound action
The method of object follows these steps to implement:
One, nano zero valence iron is thrown into staying water, obtains the water body containing nano zero valence iron；
Two, (quick) water body of the stirring containing nano zero valence iron, while ferrate is added and is reacted；
Three, to after reaction, to treated water body filtration, the removal of pollutant in water body is completed.
In present embodiment step 1 nano zero valence iron be using reducing agent will molysite or its oxide etc. reduction made from
The zero-valent iron particle of nanoscale size.
The iron-oxo species-bis- of reproducibility can be generated when present embodiment ferrate and nano zero valence iron compound action
Valence iron, and ferrate selfdecomposition and can generate hydrogen peroxide after reacting with reducing agent utilizes the anti-of ferrous iron and hydrogen peroxide
It answers, the stronger hydroxyl radical free radical of reactivity can be generated in system.Nano zero valence iron produces a variety of after reacting with ferrate
The stronger metastable state oxide species of reactivity, specifically include the intermediate state iron of tetravalence, pentavalent, singlet oxygen and hydroxyl radical free radical
Deng.And the absorption property of the oxidation and the ferriferous oxide generated in situ based on reinforcing, nano zero valence iron and ferrate are multiple
Cooperation can make the removal rate of Typical Organic Pollutants in the water of source up to 80% or more, TOC removal rate up to 60% or more after using, or make
COD content reduces by 60%~90% in sewage, or makes the removal rate of the heavy metal contaminants such as lead, arsenic, thallium, cadmium up to 80% or more.
Specific embodiment 2: the present embodiment is different from the first embodiment in that pending water described in step 1
To drink surface water, Drinking Water, sanitary sewage or industrial wastewater.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that in step 1 pending water
Pollutant be micro (persistence) organic pollutant, humic acids organic pollutant, fulvic acid class organic pollutant, protein
Class organic pollutant or heavy metal contaminants.
Specific embodiment 4: high-speed rail in step 2 unlike one of present embodiment and specific embodiment one to three
Hydrochlorate is the mixture of potassium ferrate, sodium permanganate or both.
Specific embodiment 5: unlike one of present embodiment and specific embodiment one to four in step 1 to
0.01~100mg/L nano zero valence iron is added in processing water body.
Specific embodiment 6: present embodiment is from step 1 unlike specific embodiment five into staying water
Add 0.1~20mg/L nano zero valence iron.
Specific embodiment 7: step 2 is added unlike one of present embodiment and specific embodiment one to six
The ferrate of 0.1~100mg/L is reacted.
Specific embodiment 8: 0.1~20mg/ is added from step 2 unlike specific embodiment seven in present embodiment
The ferrate of L is reacted.
Specific embodiment 9: being added in step 2 unlike one of present embodiment and specific embodiment one to eight
The time that ferrate is reacted is 5~120min.
Specific embodiment 10: present embodiment from ferrate is added in step 2 unlike specific embodiment nine
The time reacted is 30~80min.
Specific embodiment 11: it is adopted in step 3 unlike one of present embodiment and specific embodiment one to ten
With quartz sand, filter cloth or wire mesh to treated water body filtration.
Present embodiment can also filter water body using modes such as anthracite, polymeric membrane, diatomite.
Embodiment one: the present embodiment using nano zero valence iron and potassium ferrate compound action go water removal benzoic acid method by
The following steps are implemented:
One, the concentration of benzoic acid in pending water, initial concentration 2.5mg/L, dissolubility total organic matter concentration are measured
It (TOC) is 5mg/L；
Two, 2mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the potassium ferrate reaction 30min of 2mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
Nano zero valence iron, obtained nano zero-valence are synthesized using sodium borohydride liquid-phase reduction ferric ion in the present embodiment
Iron particle size is between 70~80nm.
The removal rate of benzoic acid is 95% or more in the present embodiment, and the removal rate of dissolubility total organic matter is 60% or more.
Embodiment two: the present embodiment goes to the side of Atrazine in water removal using nano zero valence iron and Na2Fe04 compound action
Method follows these steps to implement:
One, the concentration of Atrazine in pending water is measured, initial concentration 0.5mg/L, dissolubility total organic matter is dense
Spending (TOC) is 5mg/L；
Two, 1mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the high iron acid sodium reaction 30min of 2mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
The removal rate of card Atrazine is 86% or more in the present embodiment, the removal rate of dissolubility total organic matter be 65% with
On.
Embodiment three: the method that the present embodiment removes lead and cadmium in water removal using nano zero valence iron and Na2Fe04 compound action
It follows these steps to implement:
One, the concentration of lead and cadmium in pending water is measured, initial concentration is respectively 1mg/L and 0.5mg/L, and dissolubility is total
Organic concentration (TOC) is 6mg/L；
Two, 5mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the high iron acid sodium reaction 60min of 5mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
The removal rate of lead is 95% or more in the present embodiment, and the removal rate of cadmium is 90%, the removal of dissolubility total organic matter
Rate is 70% or more.
Example IV: the present embodiment utilizes COD in nano zero valence iron and Na2Fe04 compound action removal industrial wastewater
Method follows these steps to implement:
One, the concentration of COD in pending water, initial concentration 400mg/L are measured；
Two, 50mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the high iron acid sodium reaction 60min of 50mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
The removal rate of COD is 85% or more in the present embodiment.
Embodiment five: the present embodiment utilizes nitrophenols in nano zero valence iron and potassium ferrate compound action removal drinking water
Method follows these steps to implement:
One, the concentration of nitrophenols in pending water, initial concentration 0.05mg/L are measured；
Two, 1.5mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the potassium ferrate reaction 30min of 3mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
The removal rate of nitrophenols is 90% or more in the present embodiment, and the removal rate of dissolubility organic pollutant is 70%.
Embodiment six: the present embodiment utilizes brufen in nano zero valence iron and potassium ferrate compound action removal drinking water
Method follows these steps to implement:
One, the concentration of brufen in pending water, initial concentration 0.80mg/L are measured；
Two, 4mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the potassium ferrate reaction 30min of 2mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
The removal rate of brufen is 90% or more in the present embodiment, and the removal rate of dissolubility organic pollutant is 60%.
Embodiment seven: the present embodiment using nano zero valence iron and Na2Fe04 compound action removal drinking water in humic acid and
The method of arsenate follows these steps to implement:
One, the concentration of humic acid and arsenate in pending water is measured, initial concentration is respectively 5.0mg/L and 0.1mg/
L；
Two, 3mg/L nano zero valence iron is added into staying water, obtains the water body containing nano zero valence iron；
Three, (quick) water body of the stirring containing nano zero valence iron, while the high iron acid sodium reaction 60min of 5mg/L is added；
Four, to after reaction, to treated water body filtration, the residual concentration of its contained pollutant, dissolubility are measured
The residual concentration of organic pollutant completes the removal of pollutant in water body.
The removal rate of arsenate is 95% or more in the present embodiment, and the removal rate of humic acid is 70%, the organic dirt of dissolubility
The removal rate for contaminating object is 65%.
Claims (10)
1. utilizing the method for nano zero valence iron and ferrate compound action removal water pollutant, it is characterised in that this method is pressed
The following steps are realized:
One, nano zero valence iron is thrown into staying water, obtains the water body containing nano zero valence iron；
Two, the water body containing nano zero valence iron is stirred, while ferrate is added and is reacted；
Three, to after reaction, to treated water body filtration, the removal of pollutant in water body is completed.
2. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that pending water described in step 1 is to drink surface water, Drinking Water, sanitary sewage or industrial wastewater.
3. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that the pollutant in step 1 pending water is micro quantity organic pollutant, humic acids organic pollutant, Fu Li
Acids organic pollutant, protein-based organic pollutant or heavy metal contaminants.
4. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that ferrate is the mixture of potassium ferrate, sodium permanganate or both in step 2.
5. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that add 0.01~100mg/L nano zero valence iron in step 1 into staying water.
6. the side according to claim 5 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that step 1 adds 0.1~20mg/L nano zero valence iron into staying water.
7. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that the ferrate that 0.1~100mg/L is added in step 2 is reacted.
8. the side according to claim 7 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that the ferrate that 0.1~20mg/L is added in step 2 is reacted.
9. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that it is 5~120min that the time that ferrate is reacted is added in step 2.
10. the side according to claim 1 using nano zero valence iron and ferrate compound action removal water pollutant
Method, it is characterised in that using quartz sand, filter cloth or wire mesh to treated water body filtration in step 3.
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Cited By (1)
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| CN111689568A (en) * | 2020-05-15 | 2020-09-22 | 广州大学 | Zero-valent bimetal material and preparation method and application thereof |
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