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Method for restoring hexavalent-chromium-polluted underground water by virtue of stable zero-valent iron nanoparticles

A nanoparticle and zero-valent iron technology, applied in the restoration of polluted soil, reduced water/sewage treatment, etc., can solve the problem of reducing chemical activity and achieve the effect of high reaction rate, high dispersion, and large specific surface area

Inactive Publication Date: 2014-07-30
山西敏达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for repairing hexavalent chromium-contaminated groundwater by using stable zero-valent iron nanoparticles to reduce Cr in the polluted site by using nano-zero-valent (VI), and then reduce the chemical activity of Cr(VI), so as to achieve the purpose of remediating the groundwater of the polluted site

Method used

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  • Method for restoring hexavalent-chromium-polluted underground water by virtue of stable zero-valent iron nanoparticles
  • Method for restoring hexavalent-chromium-polluted underground water by virtue of stable zero-valent iron nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Through data collection and on-site investigation, investigate the pollution status of groundwater and soil in typical heavy metal-polluted sites to understand the pollution status of heavy metal elements;

[0037] (2) Synthesis of stable nZVI:

[0038] 1) Add FeCl with a concentration of 0.8mol / L to a 250ml three-necked flask 3 ·6H 2 O solution 10mL, 0.1g starch and 0.2g citric acid, mechanically stir to make it fully mixed;

[0039] 2) Then weigh 3.79×10 -3 wxya 4 Dissolve in 10mL of deionized water to form an aqueous solution with a concentration of 0.757g / L;

[0040] 3) Under electric stirring at room temperature and normal pressure, slowly add it dropwise at a rate of 4mL / min to the FeCl 3 In the three-necked flask of the solution, the solution gradually turned black, and after the dropwise addition was completed, the reaction was continued for 30 minutes to generate stable black nano-iron particles;

[0041] 4) The product was washed three times with dei...

Embodiment 2

[0048] (1) Through the collection of data and on-site surveys, investigate the pollution status of groundwater and soil in typical heavy metal polluted sites in Shanxi to understand the pollution status of heavy metal elements;

[0049] (2) Synthesis of stable nZVI:

[0050] 1) Add FeCl with a concentration of 0.8mol / L to a 250ml three-necked flask 3 ·6H 2 O solution 10mL, 0.1g starch and 0.2g citric acid, mechanically stir to make it fully mixed;

[0051] 2) Then weigh 3.79×10 -3 wxya 4 Dissolve in 10mL of deionized water to form an aqueous solution with a concentration of 0.757g / L;

[0052] 3) Under electric stirring at room temperature and normal pressure, slowly add it dropwise at a rate of 4mL / min to the FeCl 3 In the three-necked flask of the solution, the solution gradually turned black, and after the dropwise addition was completed, the reaction was continued for 30 minutes to generate stable black nano-iron particles;

[0053] 4) The product was washed three tim...

Embodiment 3

[0060] (1) Through the collection of data and on-site surveys, investigate the pollution status of groundwater and soil in typical heavy metal polluted sites in Shanxi to understand the pollution status of heavy metal elements;

[0061] (2) Synthesis of stable nZVI:

[0062] 1) Add FeCl with a concentration of 0.8mol / L to a 250ml three-necked flask 3 ·6H 2 O solution 10mL, 0.1g starch and 0.2g citric acid, mechanically stir to make it fully mixed;

[0063] 2) Then weigh 3.79×10 -3 wxya 4 Dissolve in 10mL of deionized water to form an aqueous solution with a concentration of 0.757g / L;

[0064] 3) Under electric stirring at room temperature and normal pressure, slowly add it dropwise at a rate of 4mL / min to the FeCl 3 In the three-necked flask of the solution, the solution gradually turned black, and after the dropwise addition was completed, the reaction was continued for 30 minutes to generate stable black nano-iron particles;

[0065] 4) The product was washed three tim...

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Abstract

The invention relates to a method for restoring hexavalent-chromium-polluted underground water by virtue of stable zero-valent iron nanoparticles. According to the method, for preventing the agglomeration of the nanoparticles and prolonging the reaction activities of the nanoparticles, water-soluble polysaccharide (CMC) is utilized as a stabilizer and a dispersing agent to synthesize stable iron-based nanoparticles, so that high dispersity and long reaction activities can be realized, the nanoparticles are effectively transferred to a target pollution source of a heavy metal pollution field by virtue of an injection method, and toxic heavy metal Cr (VI) contained in the nanoparticles is reduced, adsorbed and fixed, so that the transfer capabilities of the nanoparticles in soil and underground water are reduced, and finally an in-situ restoring purpose of the pollution field is realized; the method can be applied to the industries such as electroplating, printing and dyeing, electronic device machining, heavy metal machining and the like, and zero-valent iron and nanometer iron oxide have excellent application prospects in restoring processes of environmental pollutants due to special superiorities and wide decontamination and water purification capacities.

Description

technical field [0001] The invention relates to the restoration technology of groundwater polluted by heavy metal hexavalent chromium Cr (VI), in particular to a method for repairing [Cr (VI)] polluted groundwater by using stable zero-valent iron nanoparticles (nZVI). Background technique [0002] Groundwater is closely related to the survival of human beings. More than 60% of the cities in my country mainly rely on groundwater for drinking. However, with the improvement of people's living standards and the acceleration of urbanization, the problem of groundwater pollution in my country has become increasingly prominent. Among them, heavy metals, petroleum, polycyclic aromatic hydrocarbons, chlorinated Groundwater pollution caused by pollutants such as hydrocarbons is particularly prominent. According to survey reports, the comprehensive quality of shallow groundwater in the North China Plain is generally poor. There is almost no Class I groundwater, and only 22.2% of Class I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C02F1/70
Inventor 不公告发明人
Owner 山西敏达科技有限公司
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