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Heavy metal lead contaminated soil remediation method based on deep eutectic solvent synthesized from choline chloride and malonic acid

A technology of lead-contaminated soil and deep eutectic solvent, which is applied in the field of remediation of heavy metal lead-contaminated soil, can solve the problems of ecological system hazards and long bioremediation cycle, and achieve the effect of no secondary pollution, less usage and cost reduction

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

However, the cycle of bioremediation is relatively long, and it will bring new biological species to the original soil ecological environment, which may bring certain harm to the ecosystem.

Method used

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  • Heavy metal lead contaminated soil remediation method based on deep eutectic solvent synthesized from choline chloride and malonic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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.

[0023] Add 10 g of lead-contaminated soil (lead content about 15,000 mg / kg), 50 ml of the mixed solution, 0.37 g of ethylenediaminetetraacetic acid disodium salt 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 left to cool at room temperature 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 14702.17 mg...

Embodiment 2

[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.

[0027] Add 10 g of lead-contaminated soil (lead content about 7000 mg / kg), 50 ml of mixed solution, 0.37 g of ethylenediaminetetraacetic acid disodium salt 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 left to cool at room temperature for 20 min, and the leaching concentration of metallic lead in the supernatant was analyzed by ICP-OES.

[0028] After analysis, the lead concentration in the original soil leachate was 14,833.67 mg / L after continuous stirring for 1 h, whic...

Embodiment 3

[0030] 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.

[0031] Add 10 g of lead-contaminated soil (lead content about 15,000 mg / kg), 50 ml of the mixed solution, 0.37 g of ethylenediaminetetraacetic acid disodium salt 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 at room temperature (25 °C) for 0.5 to 6 hours. After the reaction was completed, the Erlenmeyer flask was left to cool at room temperature for 20 min, and the leaching concentration of metallic lead in the supernatant was analyzed by ICP-OES.

[0032] After analysis, the concentration of lead in the original soil leachate was 10,527.35 mg / L after continuous stirring for 1...

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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 a deep eutectic solvent synthesized from choline chloride and malonic acid. The method comprises the following steps: firstly, grinding and sieving naturally air-dried heavy metal lead contaminated soil, then adding sieved contaminated soil particles, a synthesized choline chloride malonic acid solvent, nitric acid and a soil chelating agent into a conical flask in proportion, and putting the conical flask into a magnetic stirrer for stirring, heating and leaching reaction. The lead-containing compounds which are insoluble in water in the soil are eluted through heating leaching of the stirrer, 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 deep eutectic solvent synthesized from choline chloride and malonic acid. 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 technologies commonly used in the remediation of 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,...

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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