Functional ionic liquid and preparation method thereof as well as method for ultrasonic intensified leaching of Cd in soil and recycling method

An ionic liquid and functional technology, which is applied in the field of soil heavy metal pollution restoration, can solve the problems of difficult reuse, poor biodegradability, and secondary pollution of soil, etc., and achieve the effect of high reuse rate, easy recycling, and high thermal decomposition temperature

Inactive Publication Date: 2019-01-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that the traditional stirring and rinsing operation takes a long time, and some high-efficiency leaching agents (such as chelating reagents, surfactants) are not easy to reuse, and their biodegradability is poor, which easily causes secondary pollution of the soil. Volatile and pollute the air

Method used

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  • Functional ionic liquid and preparation method thereof as well as method for ultrasonic intensified leaching of Cd in soil and recycling method
  • Functional ionic liquid and preparation method thereof as well as method for ultrasonic intensified leaching of Cd in soil and recycling method
  • Functional ionic liquid and preparation method thereof as well as method for ultrasonic intensified leaching of Cd in soil and recycling method

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Experimental program
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preparation example Construction

[0035] The preparation method of described functional ionic liquid, comprises the steps:

[0036] Step 1: Two (2-ethylhexyl) sodium sulfosuccinate (NaAOT) and tetrabutylammonium chloride are raw materials, weigh 20mmol NaAOT and tetrabutylammonium chloride respectively and put in two beakers, respectively Add 50mL of chloroform into two beakers, and stir to dissolve. After about 15 minutes, it will be completely dissolved. After dissolving, transfer it to a 100mL round-bottom flask for mixing. Stir magnetically at 45°C-55°C for 20-30h, during which time it will be condensed and refluxed to obtain Crude product; Wherein, the mol ratio of two (2-ethylhexyl) sodium sulfosuccinate and tetrabutyl ammonium chloride is 1:1;

[0037] Step 2: washing the crude product with water several times until no chlorine ions are detected in the aqueous phase;

[0038] Step 3: Evaporate the product obtained in Step 2 to remove chloroform, and then vacuum-dry it at 60-90° C. for 30-50 h to obtain...

Embodiment 1

[0046] The preparation method of described functional ionic liquid, comprises the steps:

[0047] Step 1: Two (2-ethylhexyl) sodium sulfosuccinate (NaAOT) and tetrabutylammonium chloride are raw materials, weigh 20mmol NaAOT and tetrabutylammonium chloride respectively and put in two beakers, respectively Add 50mL of chloroform to the two beakers, and stir to dissolve. After about 15 minutes, it will be completely dissolved. After dissolving, transfer to a 100mL round-bottomed flask for mixing, and stir magnetically at 50°C for 24h, during which time it will be condensed and refluxed to obtain the crude product; among them, The mol ratio of two (2-ethylhexyl) sodium sulfosuccinate and tetrabutylammonium chloride is 1:1;

[0048] Step 2: washing the crude product with water until no chloride ions are detected in the aqueous phase;

[0049] Step 3: The product obtained in Step 2 was evaporated to remove chloroform, and then vacuum-dried at 80° C. for 48 hours to obtain a functi...

Embodiment 2

[0051] The preparation method of described functional ionic liquid, comprises the steps:

[0052]Step 1: Two (2-ethylhexyl) sodium sulfosuccinate (NaAOT) and tetrabutylammonium chloride are raw materials, weigh 20mmol NaAOT and tetrabutylammonium chloride respectively and put in two beakers, respectively Add 50mL of chloroform into the two beakers, and stir to dissolve. After about 15 minutes, all of them are dissolved. After dissolving, transfer to a 100mL round bottom flask for mixing, and stir magnetically at 45°C for 20h. The mol ratio of two (2-ethylhexyl) sodium sulfosuccinate and tetrabutylammonium chloride is 1:1;

[0053] Step 2: washing the crude product with water until no chloride ions are detected in the aqueous phase;

[0054] Step 3: The product obtained in Step 2 was evaporated to remove chloroform, and then vacuum-dried at 70° C. for 50 h to obtain a functional ionic liquid.

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Abstract

The invention relates to a functional ionic liquid and a preparation method thereof as well as a method for ultrasonic intensified leaching of Cd in soil and a recycling method. The functional ionic liquid is bi(2-ethylhexyl) sulfosuccinic acid tetrabutyl ammonium chloride. The preparation method comprises the following steps: dissolving bi(2-ethylhexyl) sulfo sodium succinate and tetrabutyl ammonium chloride in trichloromethane, stirring and performing refluxing reaction for 20-30h at 45-55 DEG C, so as to obtain a crude product; washing the crude product until no chloride ion is detected ina water phase; removing trichloromethane from the obtained product, and drying to obtain the functional ionic liquid. The method for leaching Cd in soil comprises the following steps: mixing soil, thefunctional ionic liquid and water, ultrasonically leaching heavy metal Cd in the soil; performing centrifugal separation after leaching is ended, so as to remove ionic liquid and water, and washing and drying the obtained soil. According to the invention, Cd in the soil can be effectively leached, the leaching time is short, and the functional ionic liquid can be recycled, thus being green and environment-friendly.

Description

technical field [0001] The invention belongs to the field of remediation of soil heavy metal pollution, and in particular relates to a functional ionic liquid and a preparation method thereof, a method for ultrasonically enhanced leaching of Cd in soil, and a recovery method. Background technique [0002] With the rapid development of urban industry and the promotion of agricultural technology, soil heavy metal pollution, especially Cd pollution, is very prominent. Seriously affect land quality, food safety, and even human health, so it is particularly important to find ways to restore heavy metal-contaminated soil. [0003] Ex-situ soil leaching remediation technology is a physical and chemical separation technology that can effectively remove pollutants from the soil, reduce the potential risk of groundwater pollution, high remediation efficiency, low treatment cost, and easy system control and disposal It has become one of the hot research directions of rapid remediation...

Claims

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Application Information

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IPC IPC(8): C07C309/17C07C303/32C07C209/00B09C1/02C09K17/14
CPCB09C1/02C07C211/63C07C309/17C09K17/14
Inventor 郭军康李艳萍徐慧荟任心豪花莉贾红磊魏婷范春辉
Owner SHAANXI UNIV OF SCI & TECH
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