Electrochemical remediation method for lead-zinc combined polluted soil based on deep-eutectic solvent

A technology of deep eutectic solvent and complex pollution, applied in the restoration of contaminated soil, etc., can solve the problems of long cycle and inapplicability of bioremediation technology, and achieve the effects of low vapor pressure, strong conductivity and good working environment

Pending Publication Date: 2021-12-17
云南省生态环境科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, phytoremediation uses the respiration, photosynthesis, or cell metabolism of plants to absorb and solidify heavy metals; microbial remediation provides nutrients to the underground environment, enhances biological reduction, and uses underground microorganisms to move or fix heavy metals. However, the cycle of bioremediation technology is long, and it is not suitable for land that needs to be developed and utilized urgently

Method used

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  • Electrochemical remediation method for lead-zinc combined polluted soil based on deep-eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Electrochemical repair method of lead zinc composite contaminated soil based on low-molten solvent, the specific steps are as follows:

[0028] (1) mixing the choline and ethylene glycol in accordance with the molar ratio of 1: 2, then heating the mixture at 70 ° C to clear the clear transparent liquid, synthesize cholinergic-ethylene glycol low melting solvent (1CHCl : 2EG DES);

[0029] (2) Dilute hydrochloric acid is added to the 1chCl: 2EG DES synthesized to step (1), and the mixture is uniform, and the synthetic solution is formulated, injecting the electrolytic cell;

[0030] (3) The electrolyte prepared by step (2) is heated to 60 ° C, and the contaminated soil is an anode (soil volume and the pouring agent ratio of 10: 1), the copper sheet is a cathode, and the area ratio of the anode and the cathode is 2: 1, the yin anodic pitch is 9cm, and the cation exchange film is provided at 3 cm between the cathode between the cathode, and the chlorine-containing electrolyte ...

Embodiment 2

[0034] Electrochemical repair method of lead zinc composite contaminated soil based on low-molten solvent, the specific steps are as follows:

[0035] (1) mixing the choline and ethylene glycol in accordance with the molar ratio of 1: 2, then heating the mixture at 70 ° C to clear the clear transparent liquid, synthesize cholinergic-ethylene glycol low melting solvent (1CHCl : 2EG DES);

[0036] (2) Dilute hydrochloric acid is added to the 1chCl: 2EG DES synthesized to step (1), and the mixture is uniform, and the synthetic solution is formulated, injecting the electrolytic cell;

[0037] (3) The electrolyte prepared by step (2) is heated to 60 ° C to contaminate the soil as an anode (the soil volume and the pouring agent ratio of 10: 2), the copper sheet is the cathode, and the area ratio of the anode and the cathode is 2: 1, the yin anodic polar spacing is 6 cm, and the cation exchange film is provided at 2cm from the cathode between the cathode, the chlorine-containing electrol...

Embodiment 3

[0041] Electrochemical repair method of lead zinc composite contaminated soil based on low-molten solvent, the specific steps are as follows:

[0042] (1) mixing the choline and ethylene glycol in accordance with the molar ratio of 1: 2, then heating the mixture at 70 ° C to clear the clear transparent liquid, synthesize cholinergic-ethylene glycol low melting solvent (1CHCl : 2EG DES);

[0043] (2) Dilute hydrochloric acid is added to the 1chCl: 2EG DES synthesized to step (1), and the mixture is uniform, and the synthetic solution is formulated, injecting the electrolytic cell;

[0044](3) Step (2) Preparation of electrolytic solution was heated to 60 ℃, as an anode in contaminated soil (soil volume to volume ratio of pore forming agent was 10: 3), copper cathode, anode and the cathode to control the area ratio of 2: 1, anode and cathode spacing is 6cm, the cation exchange membrane disposed between the electrodes from the cathode at 2cm yin and yang, the chlorine-containing elec...

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Abstract

The invention relates to an electrochemical remediation method for lead-zinc combined contaminated soil based on a deep-eutectic solvent, and belongs to the technical field of heavy metal contaminated soil remediation. The method comprises the following specific steps: firstly, mixing choline chloride and ethylene glycol according to a molar ratio of 1: 2, heating, stirring and co-melting at 70 DEG C to synthesize a choline chloride-ethylene glycol deep-eutectic solvent; adding diluted hydrochloric acid into the deep-eutectic solvent, stirring and dissolving uniformly to prepare a synthetic solution, and injecting into an electrolytic cell; and preparing a contaminated soil anode from graphite, contaminated soil and a pore-forming agent, arranging a cation exchange membrane on one side close to the cathode, adding a chlorine-containing electrolyte into an anode chamber, performing electrolysis, and after electrolysis is finished, taking anode mud as lead contaminated soil, anode scrap as repaired soil and cathode sediment as recycled metal. The method is simple, the electric energy utilization rate is high, the deep-eutectic solvent is non-toxic and degradable, the electrolyte can be recycled, secondary pollution is avoided, and the method is an economical and efficient lead-zinc combined contaminated soil remediation method.

Description

Technical field [0001] The present invention belongs to the field of heavy metal contamination soil repair technology. Background technique [0002] As the basic resources of economic and social development, the soil is self-funded. With the development of social industry, the situation of heavy metal pollution soil has gradually highlighted, heavy metal soil pollution repair technology has become the focus of industry concerns. The current heavy metal pollution repair technology mainly has physical repair, chemical repair and biological repair. [0003] Physical repair techniques refer to the physical properties of heavy metals, sieving heavy metals with soil, wherein soil rinsing is the most widely used physics repair technology. Soil colloration techniques are selected according to different heavy metals, and the weight metal is selected, but the eluge can cause secondary pollution, and during treatment, soil texture, pollutant morphology, and elimination can affect repair. ef...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 苏波和丽萍魏恒崔灿文魏中华龙伟邱集明
Owner 云南省生态环境科学研究院
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