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Heavy metal lead contaminated soil remediation method based on choline chloride eutectic solvents

A technology of lead-contaminated soil and low eutectic solvent is applied in the restoration of polluted soil and other directions to achieve the effects of cost reduction, efficient treatment and restoration, and no secondary pollution.

Pending Publication Date: 2021-01-15
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For above-mentioned deficiencies in the prior art of remediating lead-contaminated soil, the object of the present invention is to provide a method for remediating lead-contaminated soil based on choline chloride deep eutectic solvent

Method used

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  • Heavy metal lead contaminated soil remediation method based on choline chloride eutectic solvents

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Effect test

Embodiment 1

[0020] Choline chloride and malonic acid were weighed at a molar ratio of 2:1, placed in a beaker, and heated in a water bath at 80°C for 7 hours to synthesize a colorless and transparent solution, namely DES. DES and 0.5wt% nitric acid solution were prepared into a mixed solution at a volume ratio of 3:2. Add 10 g of lead-contaminated soil (lead content about 15000 mg / kg), 50 ml of mixed solution and a stirring bar into a 250 ml Erlenmeyer flask with a stopper. Set the stirring speed of the magnetic stirrer to 200 rpm and the temperature to 40 °C and continue stirring for 0.5-6 hours. After the reaction was completed, the Erlenmeyer flask was placed at room temperature and cooled for 20 min, and the leaching concentration of metallic lead in the supernatant was analyzed by ICP-OES.

[0021] After analysis, after continuous stirring for 0.5 h, the lead concentration in the original soil leachate was 12533.28 mg / L, which could remove 83.56% of the lead in the soil.

Embodiment 2

[0023] Choline chloride and malonic acid were weighed at a molar ratio of 2:1, placed in a beaker, and heated in a water bath at 80°C for 7 hours to synthesize a colorless and transparent solution, namely DES. DES and 0.5wt% nitric acid solution were prepared into a mixed solution at a volume ratio of 3:2. Add 10 g of lead-contaminated soil (lead content about 7000 mg / kg), 50 ml of mixed solution and a stirring bar into a 250 ml Erlenmeyer flask with a stopper. Set the stirring speed of the magnetic stirrer to 200 rpm and the temperature to 40 °C and continue stirring for 0.5-6 hours. After the reaction was completed, the Erlenmeyer flask was placed at room temperature and cooled for 20 min, and the leaching concentration of metallic lead in the supernatant was analyzed by ICP-OES.

[0024] After analysis, after continuous stirring for 0.5 h, the lead concentration in the original soil leachate was 13,014.50 mg / L, which could remove 85.76% of the lead in the soil.

Embodiment 3

[0026] Choline chloride and malonic acid were weighed at a molar ratio of 2:1, placed in a beaker, and heated in a water bath at 80°C for 7 hours to synthesize a colorless and transparent solution, namely DES. DES and 0.5wt% nitric acid solution were prepared into a mixed solution at a volume ratio of 3:2. Add 10 g of lead-contaminated soil (lead content about 15000 mg / kg), 50 ml of mixed solution and a stirring bar into a 250 ml Erlenmeyer flask with a stopper. Set the stirring speed of the magnetic stirrer to 200 rpm, and keep stirring for 0.5-6 hours at room temperature (25°C). After the reaction was completed, the Erlenmeyer flask was placed at room temperature and cooled for 20 min, and the leaching concentration of metallic lead in the supernatant was analyzed by ICP-OES.

[0027] After analysis, after continuous stirring for 0.5 h, the lead concentration in the original soil leachate was 10,428.47 mg / L, which could remove 69.52% of lead in the soil.

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Abstract

The invention belongs to the technical field of heavy metal contaminated soil treatment, and particularly relates to a heavy metal lead contaminated soil remediation method based on choline chloride eutectic solvents. The method comprises the following steps: firstly, grinding and sieving naturally air-dried heavy metal lead polluted soil, then mixing sieved polluted soil particles, choline chloride eutectic solvents and diluted liquid in proportion, carrying out stirring, heating and leaching reaction, eluting lead-containing compounds which are insoluble in water in the soil through stirring, heating and leaching, and effective leaching remediation of the lead-contaminated soil is achieved. The method disclosed by the invention has the characteristics of simplicity, high efficiency and no secondary pollution, and is a lead-contaminated soil remediation method with a good prospect.

Description

technical field [0001] The invention belongs to the technical field of heavy metal-contaminated soil treatment, and in particular relates to a method for remediating heavy metal-lead-contaminated soil based on a choline chloride deep eutectic solvent. Background technique [0002] With the rapid development of industrialization and the significant improvement of people's living standards, the remediation of heavy metal-contaminated soil has become a hot and difficult issue in environmental science research at home and abroad. [0003] The remediation technologies commonly used in heavy metal-contaminated soil mainly include: engineering measures, physical and chemical remediation, chemical remediation and biological remediation technologies. Among them, engineering measures are more classic soil heavy metal restoration methods, which are simple and stable, but the amount of engineering implemented is huge, the investment cost is high, the original ecological structure and so...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 苑文仪黄开友申英杰王晓岩谢俊影王珍霞白建峰张承龙王景伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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