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Application of an ionic liquid-molecular solvent composite extractant

A composite extraction agent and ionic liquid technology, applied in liquid solution solvent extraction, solvent extraction, extraction water/sewage treatment, etc., can solve the problems of reducing the solubility of target analytes, increasing the solubility of extraction agents, and reducing extraction efficiency

Active Publication Date: 2022-01-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional dispersion-liquid-liquid microextraction uses methanol, acetone, etc. as dispersants, and uses halogenated hydrocarbons such as carbon tetrachloride and tetrachloroethylene as extractants to complete the extraction, but the addition of dispersants will increase the solubility of the extractant in water and Reduce the solubility of the target analyte in water, thereby reducing the extraction efficiency. At the same time, extraction agents such as halogenated hydrocarbons also have certain toxicity, which will cause certain pollution to the environment.

Method used

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  • Application of an ionic liquid-molecular solvent composite extractant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select 1-methyl-3-octylimidazole bis(trifluoromethylsulfonyl)imide salt as the ionic liquid, and butyl propionate as the molecular solvent to form a composite extractant for extracting phoxim in water, adding the composite extractant 10mL (wherein, the volume ratio of ionic liquid and molecular solvent is 7:3) was fully mixed in the centrifuge tube, and the volume of water sample was added to be 8mL (phoxim concentration was 0.112mg / L), and then the centrifuge tube was sonicated for 15min ( Ultrasonic input power: 400W), ice bath for 25min (0°C), centrifuge for 16min, take 20μL of the lower organic phase and put it into the high performance liquid chromatography to analyze the content, the content of phoxim in the lower phase after extraction is 15.5244mg / L , The recovery rate of phoxim calculated in the lower phase after extraction was 70%. At this time, the concentration of phoxim in the upper aqueous phase was 0.0777mg / L, and the national discharge standard was 3mg / L...

Embodiment 2

[0041] Select 1-octyl-3-methylimidazolium hexafluorophosphate as the ionic liquid, and butyl acetate as the molecular solvent to form a composite extractant for extracting fenthion in water, add 10 mL of the composite extractant (wherein, the ionic liquid and the molecular solvent The volume ratio is 7:3), after fully mixing in the centrifuge tube, add a water sample volume of 8mL (fenthion concentration is 0.112mg / L), and then ultrasonicate the centrifuge tube for 15min (ultrasonic input power: 400W) , ice-bath for 25min (the temperature of the ice-bath is 0°C), centrifuge for 16min, take 20μL of the organic phase of the lower layer and put it into the high-performance liquid chromatograph to analyze the content. The content of fenthion in the lower phase after extraction is 17.2378mg / L. The rate of recovery of thion increased to 77% from 24% when no ionic liquid was added, and from 65% when no molecular solvent was added. At this time, the concentration of fenthion in the upp...

Embodiment 3

[0043] Select 1-hexyl-3-methylimidazolium hexafluorophosphate as the ionic liquid, and hexyl acetate is used as a molecular solvent to form a composite extractant for extracting phoxim in water, and add 10 mL of the composite extractant (wherein, the volume of the ionic liquid and the molecular solvent ratio of 7:3), after fully mixing in the centrifuge tube, add a water sample volume of 8mL (phoxim concentration is 0.112mg / L), and then ultrasonically treat the centrifuge tube for 15min (ultrasonic input power: 400W), Ice-bath for 25min (the temperature of the ice-bath is 0°C), centrifuge for 16min, take 20 μL of the lower organic phase and enter it into a high-performance liquid chromatograph to analyze the content. The recovery rate of phosphorus increased from 27% when no ionic liquid was added and 67% when no molecular solvent was added to 87%. At this time, the concentration of phoxim in the upper aqueous phase was 0.0689mg / L, and the national discharge standard was 3mg / L ...

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Abstract

The invention relates to an ionic liquid-molecular solvent composite extractant and an application thereof. The composite extractant is composed of ionic liquid and molecular solvent, and the volume ratio is ionic liquid:molecular solvent=10~0.6:1; the cation of the ionic liquid is imidazolium cation or pyridinium cation; the anion is halogen anion, nitrate anion, Tetrafluoroborate anion, hexafluorophosphate anion, aluminum tetrachloride anion, zinc trichloride anion. The compound extractant composed of ionic liquid-molecular solvent of the present invention can extract organic phosphorus with an efficiency of 76%-97%.

Description

technical field [0001] The invention relates to a solvent for extracting organic phosphorus in water, in particular to an ionic liquid-molecular solvent composite extractant for liquid-liquid micro-extraction of organic phosphorus in water. Background technique [0002] Organophosphorus pesticides are a class of efficient and wide-ranging insecticides, which are often widely used to control agricultural product pests. However, organophosphorus pesticides can cause delayed or multiple neuropathy, myasthenic intermediary syndrome, and heart damage in the human body, and as the amount of organophosphate increases, it can be continuously released to the environment through evaporation, adsorption, and washing. Among them, serious environmental and food pollution are caused, and there is serious harm to humans and animals. Even if the content of organic phosphorus in water is small, it will cause great harm to the human body and the environment. Therefore, it is particularly imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26B01D11/04C07F9/18C07F9/165C02F101/30
CPCB01D11/0492C02F1/26C07F9/1657C07F9/18C02F2101/30Y02P20/54
Inventor 方静李一晗李婷婷李春利李浩
Owner HEBEI UNIV OF TECH
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