CN104117532A - Nano-material repairing agent restoring heavy-metal polluted soil and restoring method using same - Google Patents
Nano-material repairing agent restoring heavy-metal polluted soil and restoring method using same Download PDFInfo
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- CN104117532A CN104117532A CN201310141962.4A CN201310141962A CN104117532A CN 104117532 A CN104117532 A CN 104117532A CN 201310141962 A CN201310141962 A CN 201310141962A CN 104117532 A CN104117532 A CN 104117532A
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Abstract
The invention discloses a nano-material repairing agent restoring heavy-metal polluted soil and a restoring method using the same, and belongs to the technical field of soil pollution processing. The nano-material repairing agent restoring heavy-metal polluted soil is prepared by mixing the following substances: 60-70% by volume of nano hydroxyapatite (nHA) with the particle size of 27 nm and the purity of 98%, 10-20% by volume of nanoscale zero-valent iron (nZVI) with the particle size of 10 nm and in the shape of a ball, and 10-30% by volume of pure oleic acid. The invention also comprises the restoring method for heavy-metal polluted soil by using the above repairing agent. The method comprises the following step: applying the repairing agent to soil according to the mass ratio of 1:10000-15000. The nano-material repairing agent used to restore heavy-metal polluted soil comprises the characteristics of obvious restoring effect and no secondary pollution.
Description
Technical field
The present invention relates to soil pollution processing technology field, relate in particular to a kind of nano material renovation agent and restorative procedure thereof of restoration of soil polluted by heavy metal.
Background technology
Soil is one of mankind's Main Natural Resources of depending on for existence, is also the important component part of human ecological environment.Along with economic fast development, a negative effect of following is exactly to enter by all means soil containing the pollutant of heavy metal, causes the enrichment of corresponding heavy metal element in soil.Soil pollution not only affects agricultural output and quality, and relates to atmosphere and quality of water environment, and can endanger by food chain the life and health of animals and humans, that is to say, soil pollution has influence on the quality of whole environment for human survival.At present, according to statistics, the heavy metal ion amount that discharge every year on average in the whole world is in continuous increase, the average annual discharge capacity that statistics shows different heavy metal ion is as follows: approximately 1.5 ten thousand tons of mercury (Hg), approximately 3,400,000 tons of copper (Cu), plumbous (Pb) approximately 5,000,000 tons, approximately 1,500 ten thousand tons, manganese (Mn), approximately 1,000,000 tons, nickel (Ni).The whole nation dirty irrigated area investigation of carrying out according to the Ministry of Agriculture of China, in the Irrigation District of Sewage of approximately 1,400,000 hectares, suffer the land area of heavy metal pollution to account for 64.8% of Irrigation District of Sewage area, wherein slight pollution account for 46.7%, intermediate pollution account for 9.7%, severe contamination account for 8.4%, wherein with mercury (Hg) and cadmium (Cd) contaminated area maximum.And according to State Environmental Protection Administration take the lead investigation data show, the area that Pearl River Delta, the Yangtze River Delta, these economy of the ring Bohai Sea first grow up, is all faced with serious soil pollution problem.Wherein, Pearl River Delta 40% farmland metallic pollution exceeds standard, and causes grain drop in production, and economic loss constantly increases.Meanwhile, heavy metal pollution of soil can cause physiological function of plants disorder, trophic disturbance, and enter after human body by food chain, potential hazard is very big.Under this situation, heavy metal pollution of soil more and more receives people's concern, has become the important environmental problem that the whole world faces, and heavy metal pollution of soil problem has become environment and pedologist's study hotspot.
Current soil heavy metal pollution problem is more and more serious, also more and more receives researcher's concern about the research of soil pollution recovery technique.At present, overwhelming majority work is still in the laboratory simulation experimental stage, and the maturation method that reaches on-the-spot level of application is little.
Nano material refers to the material that has at least one dimension to form in nanoscale scope (1～100nm) or using it as elementary cell in space three-dimensional.See region because its transition between macroscopical Commen powder and the elementide of microcosmic is situated between, therefore present some unique character, one of them important characteristic is skin effect.Skin effect refers to that nanoparticle surface atom and the ratio of total atom number diminish with particle diameter and caused qualitative change after sharply increasing.Research shows, along with particle diameter reduces, the percentage that surface atom accounts for total atom sharply increases; Meanwhile, the surface area of nano particle and surface can also increase rapidly.This makes nano material have good adsorption and chemical reactivity.Just because of nano material has some new features that traditional material does not possess, become the forward position hot fields of current research.
Summary of the invention
In order to solve the problems of the technologies described above, the heavy metal pollution problem existing for current soil, simultaneously, there is the advantages such as high-specific surface area, high reaction activity and strong characterization of adsorption based on nano material, the object of this invention is to provide a kind of nano material renovation agent and restorative procedure thereof of restoration of soil polluted by heavy metal.The repairing effect that is subject to heavy-metal contaminated soil by this renovation agent reparation is obvious.
The object of the invention is to be achieved through the following technical solutions:
A kind of nano material renovation agent of restoration of soil polluted by heavy metal, mix and form by following material: the particle diameter of 60-70% parts by volume is 27nm, purity is that 98% nanometer hydroxyapatite (nHA), the particle diameter of 10-20% parts by volume are 10nm, extraction and nanometer iron metal (nZVI) particle spherical in shape and the pure oleic acid of 10-30% parts by volume.
A method for restoration of soil polluted by heavy metal, comprises the steps: that wherein, the mass ratio of nanometer renovation agent and soil is 1: 10000～15000 by mixed above-mentioned nano material renovation agent being manured into soil.Renovation agent and soil need to react the regular hour, and repairing effect is just obvious.Wherein, the reaction time of renovation agent and soil, while being 60 days, can reach optimal adsorption effect to the reparation of heavy metal.
Renovation agent has the ability of very strong fixing heavy metal, in certain specific pH value, plumbous (Pb) and the adsorption rate of cadmium (Cd) ion on nanometer hydroxyapatite be respectively up to 93.5% and 58.9%, can increase the chemical stability of lead (Pb) and cadmium (Cd) ion in heavy-metal contaminated soil simultaneously.Find the remarkable biological effectiveness that has reduced Lead In Soil (Pb) and cadmium (Cd) that applies taking nanometer hydroxyapatite as main repair materials by indoor culture experiment research, the content of soil available lead (Pb) and cadmium (Cd) and the amount of application of nanometer hydroxyapatite are remarkable negative correlation, along with applying of renovation agent, the aerial growth of plant is more dense, and the root growth of under ground portion obtains more flourishing.
Embodiment:
Example: heavy-metal contaminated soil place, Jiangxi Province
On example, earth site area is 20m
2, large or inaccurate for fear of the error of acquired results, choose respectively three blocks of soil, apply the renovation agent of same amount, then after measurement result, get their mean value.The composition of renovation agent is as follows: the particle diameter of 70% parts by volume is 27nm, purity is that 98% nanometer hydroxyapatite (nHA), the particle diameter of 15% parts by volume are 10nm, extraction and nanometer iron metal (nZVI) particle spherical in shape and the pure oleic acid of 15% parts by volume.
Be to carry out heavy-metal contaminated soil reparation at 1: 10000 according to renovation agent and soil quality ratio.Detect stage by stage, in the time that the reaction time is 7 days, the adsorption rate of Pb, Cd has reached 50.8% and 37.6%; Reaction time, while being 30 days, the adsorption rate of Pb, Cd was 82.5% and 50.3%; When 60 days reaction time, the adsorption rate of Pb, Cd is 92.2% and 58.2%.The testing result of the 60th day shows, renovation agent is obvious to passivation effect effectively plumbous in soil, and the available state content that records Lead In Soil is 43mg/kg, and the reduced rate of Available Lead has been reached to 92.2% level; Renovation agent has absorption passivation to a certain degree to the available Cd in soil, and the available state content of cadmium is 84mg/kg, and down ratio has reached 58.2%
Meanwhile, in renovation agent composition, hydroxyapatite and environment have good harmony, are difficult for causing secondary pollution, can become a kind of novel environmental functional mineral material; The raw material iron chemical property of extraction and nanometer iron metal is active, and source is abundant, and therefore, the renovation agent of the technology of the present invention can use on a large scale in heavy metal-polluted soil recovery project.
By the technical scheme of the invention described above, the reparation problem of the very effective heavy-metal contaminated soil having solved of the present invention, especially to being subject to the soil remediation successful of the heavy metal pollutions such as plumbous and cadmium, and the generation of soil non-secondary pollution problem after reparation.
The above; only for preferably detailed description of the invention of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (3)
1. the nano material renovation agent of a restoration of soil polluted by heavy metal, it is characterized in that, this renovation agent is mixed and is formed by following material: the particle diameter of 60-70% parts by volume is 27nm, purity is that 98% nanometer hydroxyapatite, the particle diameter of 10-20% parts by volume are 10nm, extraction and nanometer iron metal particle spherical in shape and the pure oleic acid of 10-30% parts by volume.
2. a method for restoration of soil polluted by heavy metal, is characterized in that, comprises the steps: that wherein, the mass ratio of renovation agent and soil is 1: 10000～15000 by mixed nano material renovation agent claimed in claim 1 being manured into soil.
3. the method for restoration of soil polluted by heavy metal according to claim 2, is characterized in that, the reaction time of renovation agent and soil is 60 days.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950164A (en) * | 2016-04-30 | 2016-09-21 | 安徽农业大学 | Heavy metal polluted soil repairing agent and repairing method thereof |
| CN107052033A (en) * | 2016-12-22 | 2017-08-18 | 常州大学 | The method that a kind of microwave reinforced nano zero valence iron/SODIUM PERCARBONATE repairs organochlorine pesticide pollution soil |
| CN108636996A (en) * | 2018-05-04 | 2018-10-12 | 中国农业大学 | A kind of conditioner with repairing heavy metal in soil anti-contamination function |
| CN108690626A (en) * | 2018-05-10 | 2018-10-23 | 绍兴文理学院 | A kind of novel ecological renovation agent and its production technology |
| CN110102245A (en) * | 2019-06-04 | 2019-08-09 | 东华理工大学 | A kind of preparation method and applications of more kinds of phosphate mineral composite materials of Ca-, Fe- and Ca/Fe- |
| CN111701562A (en) * | 2020-06-23 | 2020-09-25 | 中南大学 | Hydroxyapatite-loaded nano zero-valent iron composite material and preparation and application methods thereof |
| CN112642855A (en) * | 2021-01-07 | 2021-04-13 | 浙江大学 | Nano zero-valent iron-nematode cooperative remediation technology for organochlorine contaminated soil |
| CN113913192A (en) * | 2021-11-17 | 2022-01-11 | 中南大学 | Weak-crystal-form iron-phosphorus slow-release material and preparation and application thereof |
| CN114015454A (en) * | 2021-11-17 | 2022-02-08 | 中南大学 | Slow-release iron-phosphorus composite material and preparation method and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950164A (en) * | 2016-04-30 | 2016-09-21 | 安徽农业大学 | Heavy metal polluted soil repairing agent and repairing method thereof |
| CN107052033A (en) * | 2016-12-22 | 2017-08-18 | 常州大学 | The method that a kind of microwave reinforced nano zero valence iron/SODIUM PERCARBONATE repairs organochlorine pesticide pollution soil |
| CN108636996A (en) * | 2018-05-04 | 2018-10-12 | 中国农业大学 | A kind of conditioner with repairing heavy metal in soil anti-contamination function |
| CN108690626A (en) * | 2018-05-10 | 2018-10-23 | 绍兴文理学院 | A kind of novel ecological renovation agent and its production technology |
| CN110102245A (en) * | 2019-06-04 | 2019-08-09 | 东华理工大学 | A kind of preparation method and applications of more kinds of phosphate mineral composite materials of Ca-, Fe- and Ca/Fe- |
| CN111701562A (en) * | 2020-06-23 | 2020-09-25 | 中南大学 | Hydroxyapatite-loaded nano zero-valent iron composite material and preparation and application methods thereof |
| CN111701562B (en) * | 2020-06-23 | 2021-10-15 | 中南大学 | Hydroxyapatite-loaded nano zero-valent iron composite material and preparation and application methods thereof |
| CN112642855A (en) * | 2021-01-07 | 2021-04-13 | 浙江大学 | Nano zero-valent iron-nematode cooperative remediation technology for organochlorine contaminated soil |
| CN112642855B (en) * | 2021-01-07 | 2022-03-01 | 浙江大学 | Nano zero-valent iron-nematode cooperative remediation technology for organochlorine contaminated soil |
| CN113913192A (en) * | 2021-11-17 | 2022-01-11 | 中南大学 | Weak-crystal-form iron-phosphorus slow-release material and preparation and application thereof |
| CN114015454A (en) * | 2021-11-17 | 2022-02-08 | 中南大学 | Slow-release iron-phosphorus composite material and preparation method and application thereof |
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Application publication date: 20141029 |