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Method for removing heavy metals in soil or plants by using triethylamine hydrogen sulfate ionic liquid

A technology of triethylamine hydrogen sulfate and ionic liquid, which is applied in the restoration of polluted soil and other directions, can solve the problems of low moisture tolerance, low thermal stability, high price, etc., and achieves cost control, simple process, and easy operation conditions. control effect

Active Publication Date: 2020-04-17
清华苏州环境创新研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, current ionic liquids still have some disadvantages, such as expensive, low thermal stability, high viscosity, and low moisture tolerance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method utilizing triethylamine bisulfate ionic liquid ([TEA][HSO ]) to remove heavy metals in soil, the steps are as follows:

[0022] (1) Preparation of ionic liquid

[0023] In a constant low temperature (4°C) ice-water bath, 150 mL of 5M concentrated sulfuric acid solution (95.0-98.0 wt.%) was slowly added to 104.5 mL of triethylamine solution (99 wt.%). After mixing, continue to stand at the same temperature for thirty minutes;

[0024] (2) Rotary evaporation

[0025] Put the clarified solution obtained in step (1) into a rotary evaporator until the moisture and excess amine are completely sublimated and escaped;

[0026] In particular, after the mixing reaction is complete, the solution is placed in a rotary evaporator at a temperature of 80°C and a rotation speed of 200r / min for 10 hours, until the excess water and amine are evaporated and escaped.

[0027] (3) Medium temperature solid-liquid reaction

[0028] After washing the heavy metal contaminated soil,...

Embodiment 2

[0031] A method utilizing triethylamine bisulfate ionic liquid ([TEA][HSO ]) to remove heavy metals in soil, the steps are as follows:

[0032] (1) Preparation of ionic liquid

[0033] In a constant low temperature (4°C) ice-water bath, 150 mL of 5M concentrated sulfuric acid solution (95.0-98.0 wt.%) was slowly added to 104.5 mL of triethylamine solution (99 wt.%). After mixing, continue to stand at the same temperature for thirty minutes;

[0034] (2) Rotary evaporation

[0035] Put the clarified solution obtained in step (1) into a rotary evaporator until the moisture and excess amine are completely sublimated and escaped;

[0036] In particular, after the mixing reaction is complete, the solution is placed in a rotary evaporator at a temperature of 85°C and a rotation speed of 100r / min for 12 hours until excess water and amine are evaporated and escaped.

[0037] (3) Medium temperature solid-liquid reaction

[0038] After washing the heavy metal contaminated soil, grin...

Embodiment 3

[0041] A method utilizing triethylamine hydrogen sulfate ionic liquid ([TEA][HSO ]) to remove heavy metals in plants, the steps are as follows:

[0042] (1) Preparation of ionic liquid

[0043] In a constant low temperature (4°C) ice-water bath, 150ml of 5M concentrated sulfuric acid solution (95.0-98.0wt.%) was slowly added to 104.5ml of triethylamine solution (99wt.%). After mixing, continue to stand at the same temperature for thirty minutes;

[0044] (2) Rotary evaporation

[0045] Put the clarified solution obtained in step (1) into a rotary evaporator until the moisture and excess amine are completely sublimated and escaped;

[0046] In particular, after the mixing reaction is complete, the solution is placed in a rotary evaporator at a temperature of 80°C and a rotation speed of 200r / min for 10 hours, until the excess water and amine are evaporated and escaped.

[0047] (3) Medium temperature solid-liquid reaction

[0048] Wash the plants (willow branches and leaves) ...

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Abstract

The invention relates to a method for removing heavy metals in soil or plants by using a triethylamine hydrogen sulfate ionic liquid ([TEA][HSO4]). The method comprises the following steps: slowly adding a concentrated sulfuric acid solution into a triethylamine solution at a constant low temperature; after mixing is finished, standing at the same temperature; removing residual moisture and amineby using a rotary evaporator to obtain a triethylamine hydrogen sulfate ionic liquid; and mixing heavy metal contaminated soil or plants and the obtained ionic liquid to remove heavy metals. Comparedwith the method in the prior art, the method of the invention is simple and clear in process, controllable in operation condition, excellent in cost benefit, remarkable in heavy metal removal effect and free of negative influence on a soil structure and an ecological system, wherein the ionic liquid has excellent recyclability.

Description

technical field [0001] The invention belongs to the technical field of new materials and their applications, and relates to the removal of heavy metals in soil, in particular to a method for removing heavy metals in soil or plants by using triethylamine hydrogen sulfate ionic liquid. Background technique [0002] With the development of global industrialization, heavy metal elements are widely used in many fields. A large amount of waste containing heavy metals is directly or indirectly discharged into the environment, polluting soil and plants, and posing a great threat to human health. Therefore, it is increasingly important to find an effective method for separating and removing heavy metal ions. At present, the methods for separating and removing heavy metals in soil mainly include: liquid-liquid extraction, liquid-phase microextraction, solid-phase separation, cloud point separation, ion exchange, and plant extraction. The extraction rate of the traditional liquid-liqu...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 赵明范怡然张蓝谛
Owner 清华苏州环境创新研究院
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