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Method for extracting copper ions in wastewater through ionic liquid

An ionic liquid and copper ion technology, applied in the direction of improving process efficiency, can solve the problems of low extraction efficiency, secondary pollution, unstable ionic liquid and so on

Inactive Publication Date: 2018-08-28
SHENYANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of unstable ionic liquid, low extraction efficiency and easy secondary pollution in the prior art, the invention provides a kind of trifluoromethanesulfonic acid imide anion ([NTf 2 ] - ) method for extracting copper ions in wastewater by ionic liquid

Method used

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  • Method for extracting copper ions in wastewater through ionic liquid
  • Method for extracting copper ions in wastewater through ionic liquid
  • Method for extracting copper ions in wastewater through ionic liquid

Examples

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Embodiment 1

[0035] The ionic liquid used in this embodiment is 1-butyl-3-methylimidazole bis(trifluoromethylsulfonyl)imide [BMIM][NTf 2 ] extract the method for the copper ion in waste water, carry out according to the following steps:

[0036] Step 1, take 6mL of waste water containing divalent copper ions as a raw material solution and place it in a centrifuge tube, the concentration of divalent copper ions in the raw material solution is 3ug / mL, the pH of the raw material solution=8, and then add 1300uL of 0.2g / L 2 -Pyridine formaldehyde oxime (2-PA) solution, 225uL ionic liquid [BMIM][NTf 2 ] in a centrifuge tube, shake at room temperature 25°C and extract for 6 minutes;

[0037] Step 2, the solution after the extraction in step 1 is carried out 1000r centrifugation, the time of centrifugation is 4min, after separating, get the supernatant liquid, measure the divalent copper ion content in the aqueous phase before and after its extraction with flame atomic absorption spectrophotomete...

Embodiment 2

[0049] The ionic liquid used in this embodiment is 1-butyronitrile-3-methylimidazole bistrifluoromethanesulfonic acid imide [PCNMMIM][NTf 2 ] extract the method for the copper ion in waste water, carry out according to the following steps:

[0050] Step 1, take 6mL of waste water containing divalent copper ions as the raw material solution and place it in a centrifuge tube. The concentration of divalent copper ions in the raw material solution is 3ug / mL, the pH of the raw material solution is 7, and then add 1500uL 0.5g to the centrifuge tube / L of sodium diethyldithiocarbamate (DDTC) solution, 250uL selected ionic liquid [PCNMMIM][NTf 2 ], and extracted by shaking at room temperature 28°C for 6 min.

[0051] Chelating agent solution Preparation of sodium diethyldithiocarbamate (DDTC) solution: Weigh 0.5g of DDTC, add water to dissolve it, and set the volume in a 100mL volumetric flask to make a 5g / L DDTC solution. The standard working solution is used step by step dilution....

Embodiment 3

[0055] The present embodiment adopts ionic liquid 1-butyronitrile-3-methylimidazole bistrifluoromethanesulfonate imide [PCNMMIM][NTf 2 ] extract the method for the copper ion in waste water, carry out according to the following steps:

[0056] Step 1, take 6mL of waste water containing divalent copper ions as the raw material solution and place it in a centrifuge tube. The concentration of divalent copper ions in the raw material solution is 5ug / mL, the pH of the raw material solution is 4, and then add 1300uL 0.1g to the centrifuge tube / L of 1-(2-pyridylazo)-2-naphthol solution, 225uL selected ionic liquid [PCNMMIM][NTf 2 ], shake and extract at room temperature 30°C for 10 min.

[0057] Step 2, the solution after the extraction of step 1 is subjected to 3000r centrifugation, and the centrifugation time is 4min. After the separation, the supernatant is taken, and the content of divalent copper ions in the aqueous phase before and after the extraction is measured with a flam...

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Abstract

The invention relates to a method for extracting copper ions in wastewater through ionic liquid. The ionic liquid contains bistrifluoromethane sulfonimide anion ((NTf2)-). The method comprises the steps: mixing wastewater containing copper ions with the ionic liquid, extracting, centrifugally separating mixed liquid obtained after extracting to obtain a water phase and an ionic liquid phase, utilizing a back-extractant to back extracting the ionic liquid, centrifugally separating mixed liquid obtained after back extraction, washing the obtained ionic liquid phase by redistilled water to be neutral and recycling the ionic liquid. The method for extracting the copper ions in the wastewater disclosed by the invention has simpleness in operation; furthermore, the ionic liquid is immiscible with water, greenness and environmental friendliness are achieved, phase splitting is quick, an extraction separation efficiency is high, the ionic liquid is recycled after extraction, and the recycled ionic liquid cannot affect an extraction effect.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid extraction, in particular to a method for ionic liquid extraction of copper ions in waste water. Background technique [0002] As the global environmental pollution becomes more and more serious, people's requirements for the living environment are gradually increasing. Among the environmental pollution problems, heavy metal pollution has begun to attract the attention of the majority of researchers. Especially in some industrial wastewater and domestic sewage, the heavy metal content is high, the toxicity lasts for a long time and is not biodegradable, and copper ion pollution is a common heavy metal pollution in life. This kind of wastewater is directly or indirectly discharged into the environment, polluting the air , water and soil, and the food chain, causing serious harm to human health. Therefore, it is imminent to find ways to effectively deal with heavy metals. Based on the differe...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00
CPCC22B7/006C22B15/0086Y02P10/20
Inventor 刘青山赵丽薇
Owner SHENYANG AGRI UNIV
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