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Method for stabilization treatment on heavy metal polluted soil by utilizingmodifiednanozero-valent iron

A nano-zero-valent iron and stabilization treatment technology, applied in the restoration of polluted soil, etc., can solve the problems that restrict the dispersibility and mobility of polluted water and soil, the easy oxidation of nano-zero-valent iron, and the lack of soil research. and application problems, to achieve the effect of good stability and mobility, easy access, and avoidance of secondary pollution

Inactive Publication Date: 2017-06-13
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, nanoscale zero-valent iron (nano-scale zero-valent iron, nZVI) has a reduction and adsorption capacity that cannot be compared with ordinary millimeter-scale or micron-scale zero-valent iron, and can efficiently remove pollutants, such as chlorine-containing organic compounds and toxic metals. , Inorganic compounds are transformed into low-toxic or inert substances, which have been applied in the water environment, but there is still a lack of research and application in soil
[0004] Due to the electrostatic charge attraction, high surface energy, van der Waals attraction between particles, hydrogen bonds and other chemical bonds on the particle surface, nanoparticles are easy to form aggregates, and nano-zero-valent iron is easy to be oxidized. , these two defects restrict its dispersion and mobility in polluted water bodies and soils, and are the biggest obstacle to its repair ability

Method used

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  • Method for stabilization treatment on heavy metal polluted soil by utilizingmodifiednanozero-valent iron
  • Method for stabilization treatment on heavy metal polluted soil by utilizingmodifiednanozero-valent iron
  • Method for stabilization treatment on heavy metal polluted soil by utilizingmodifiednanozero-valent iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Pretreatment of heavy metal compound polluted soil

[0029] (1) Air-dry the heavy metal complex polluted soil in a well-ventilated, clean, dust-free room without volatile chemicals;

[0030] (2) Grind the air-dried heavy metal-contaminated soil with a mallet, wooden roller and plexiglass plate, and pass it through a 2mm nylon sieve to complete the soil pretreatment.

[0031] Preparation of modified nano zero-valent iron:

[0032] (1) FeSO 4 Solution preparation: weigh 0.1400g FeSO 4 ·7H 2 Put O in a beaker, add an appropriate amount of ultrapure water, stir to dissolve with a glass rod, and transfer to a 50ml volumetric flask, set the volume to the mark, shake well, and it is 0.01M FeSO 4 solution.

[0033] (2) FeSO containing polyvinylpyrrolidone 4 Preparation of solution: Weigh 0.4g polyvinylpyrrolidone, and dissolve it in 50ml 0.01M FeSO under the condition of nitrogen protection and stirrer stirring 4 solution, stirred for 15min.

[0034] (3) NaBH 4 Solutio...

Embodiment 2

[0040] To investigate the stability determination of polyvinylpyrrolidone-modified nano zero-valent iron (P-nZVI) in heavy metal-contaminated soil.

[0041] (1) Fe 0 Solution preparation: Weigh a certain mass of nano-zero-valent iron (nZVI) and polyvinylpyrrolidone-modified nano-zero-valent iron (P-nZVI) and dissolve them in deoxygenated pure water for 3 minutes to obtain nZVI solution N, P -nZVI solution P, N and Fe in P 0 The concentration is 1.0g / L.

[0042] (2) Add 12g of sieved heavy metal compound polluted soil into 100mL centrifuge tubes, and add 63mL of deionized water, and let stand at room temperature for 14 days.

[0043] (3) Replace 93% of the supernatant with the same volume of N, P (Fe=1.0g / L), and then shake it on a shaker for 70 hours. At 1h, 5h, 10h, 20h, 40h, and 60h, centrifuge at 400g for 10min to separate the free nanometer zero-valent iron from the soil, and take 1mL supernatant.

[0044] (4) Add 4ml of 12 M HCl to 1mL of supernatant for digestion. Th...

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Abstract

The invention belongs to the field of heavy metal pollution remediation in polluted environments, and discloses a method for stabilization treatment on heavy metal polluted soil by utilizingmodifiednanozero-valent iron. The method comprises the following steps: (1) performing pretreatment on soil; (2) preparing the modifiednanozero-valent iron; (3) mixing the modifiednanozero-valent iron with the soil; (4) evaluating modifiednanozero-valent iron stabilized heavy metal composite polluted soil. The method has the characteristics that nano zero-valent iron is modified by adoptingpolyvinylpyrrolidone;by virtue of a steric hindrancefunction and an electrostatic steric effect, aggregation of the nano zero-valent iron is reduced, and the dispersity and the migration of the nano zero-valent iron in the soil are improved;tests show that by adopting the method, the dispersity and the migration of the modifiednano zero-valent iron in the soil are improved and are not easily adsorbed by solid phases of the soil, and only 19.7% of P-nZVI is adsorbed by the soil 1 hour later.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal pollution in polluted environments, and in particular relates to a method for stabilizing heavy metal polluted soil by using modified nanometer zero-valent iron. Background technique [0002] Human activities such as mining, metal smelting, farmland sewage irrigation, sludge agricultural use, and the application of fertilizers and pesticides have caused a large amount of soil heavy metal pollution, which seriously threatens ecological balance, food safety and human health. Among them, cadmium (Cd), mercury (Hg), arsenic (As), chromium (Cr) and lead (Pb) are considered to be the "five poisons" among the main heavy metal pollutants. The "National Soil Pollution Survey Bulletin" shows that the total exceeding rate of soil in the country is 16.1%, and the pollution type is dominated by inorganic models. The exceeding standard rate was 19.4%. Mining and metallurgy activities are the main s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 应蓉蓉孔令雅石佳奇邓绍坡单艳红赵欣王磊张亚冯艳红
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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