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Method for simultaneously restoring organic matter and mercury polluted soil through magnetic iron-based spinel structure material

A spinel structure and organic matter technology, applied in the field of contaminated soil remediation, can solve problems such as low remediation efficiency, achieve high air permeability, avoid iron sludge pollution, and high specific surface area.

Inactive Publication Date: 2018-08-17
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the above-mentioned technical problems, the present invention provides a method for simultaneously repairing organic matter and mercury-contaminated soil using magnetic iron-based spinel structural materials, the purpose of which is to simultaneously degrade and fix organic pollutants and mercury in the soil, by This solves the technical problem of low efficiency of remediation of multiple pollutants in the soil at the same time in the existing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 500g of sandy soil with better infiltration, and make homemade hexachlorocyclohexane (the main component of "666" organochlorine pesticide, molecular formula C 6 h 6 Cl 6 ) and HgCl 2 The polluted simulated soil is the research object, the content of HCH in the soil is 100mg / kg, HgCl 2 The content is 5mg / kg. Add the prepared magnetic iron-based spinel structure material Fe into the reaction system 3 o 4 , Fe 3 o 4 The ratio of soil to mass is 1:100, and stir evenly. Prepare a hydrogen peroxide solution with a concentration of 0.4mol / L at room temperature, the pH is 6.4, and the hydrogen peroxide solution and Fe 3 o 4 The mass ratio is 280:1, and it is evenly sprayed into the above reaction system. After 30 minutes, the above soil is taken out and dried in a vacuum drying oven, and then the soil and Fe are separated by a magnet. 3 o 4 . The leachate, soil and Fe were taken separately 3 o 4 Detection of changes in the concentration of HCH and mercury.

...

Embodiment 2

[0033] Get better sandy soil 500g of infiltration property, self-made contains tetrachlorobiphenyl (one of main raw material of chemical plant, molecular formula C 12 h 6 Cl 4 ) and HgSO 4 The polluted simulated soil is the research object, the content of tetrachlorobiphenyl in the soil is 200mg / kg, HgSO 4 The content is 8mg / kg. Add the prepared magnetic iron-based spinel structure material Fe into the reaction system 2.7 Ti 0.3 o 4 , Fe 2.7 Ti 0.3 o 4 The ratio of soil to mass is 1:400, and the mixture is evenly mixed. Prepare a hydrogen peroxide solution with a concentration of 0.05mol / L at room temperature, the pH is 7.2, and the hydrogen peroxide solution and Fe 2.7 Ti 0.3 o 4 The mass ratio is 100:1, evenly sprayed into the above reaction system, after 30 minutes, the above soil is taken out and dried in a vacuum drying oven, and then the soil and Fe are separated by a magnet. 2.7 Ti 0.3 o 4 . The leachate, soil and Fe were taken separately 2.7 Ti 0.3 o ...

Embodiment 3

[0036] Take 500g of loamy soil with general percolation properties, and make homemade 2,2-dichlorovinyl (the main component of organophosphorus pesticide, molecular formula C 4 h 7 Cl 2 o 4 P) and CH 3 The simulated soil polluted by HgCl was used as the research object, the content of 2,2-dichloroethylene in the soil was 100mg / kg, CH 3 The content of HgCl was 2 mg / kg. Add the prepared magnetic iron-based spinel structure material Fe into the reaction system 2.5 Ti 0.5 o 4 , Fe 2.5 Ti 0.5 o 4 The ratio of soil to mass is 1:800, and it is evenly stirred. Prepare a hydrogen peroxide solution with a concentration of 0.008mol / L at room temperature, the pH is 7.6, and the hydrogen peroxide solution and Fe 2.5 Ti 0.5 o 4 The mass ratio is 500:1, evenly sprayed into the above reaction system, after 120min, the above soil is taken out and dried in a vacuum drying oven, and then the soil and Fe are separated by a magnet. 2.5 Ti 0.5 o 4 . The leachate, soil and Fe were t...

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Abstract

The invention discloses a method for simultaneously restoring organic matter and mercury polluted soil through a magnetic iron-based spinel structure material. The magnetic iron-based spinel structurematerial is ground and then added into the soil containing organic pollutants and heavy metal mercury pollutant, and after full stirring is finished, a low-concentration hydrogen peroxide solution isuniformly sprinkled into the soil. Compared with the prior art, the novel method for simultaneously restoring the organic matter and mercury polluted soil through the magnetic iron-based spinel structure material is provided by the invention. The method is environmentally friendly, no secondary pollution occurs, the situations that iron sludge pollution is caused by adding a large quantity of iron ions in the soil and a heating method consumes a large quantity of extra electric energy can be avoided, extra acid and alkali do not need to be added for adjustment, no acidification or alkalinization on the soil exists, and the effects on degradation of the organic pollutants and the heavy metal mercury pollutants in the soil are remarkable.

Description

technical field [0001] The invention discloses a method for simultaneously repairing organic matter and mercury polluted soil by using a magnetic iron-based spinel structure material, and belongs to the technical field of contaminated soil repair. Background technique [0002] With the further improvement of the natural environment, especially the soil safety requirements, the pollution control of organic pollutants and heavy metal mercury in the soil has attracted more and more attention. In recent years, with the use of pesticides and the relocation of chemical industry parks, a large amount of organic pollutants and heavy metal mercury remaining in the soil are not only extremely harmful, but also difficult to control. According to data, the current situation of soil pollution in China has seriously affected the quality of cultivated land, food hygiene, human living environment and the safety of urban groundwater. [0003] Remediation of pollutants in soil has always bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 周长松杨宏旻祁东旭孙佳兴张志越陈佳敏陈恒
Owner NANJING NORMAL UNIVERSITY
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