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Method for extracting and separating silver by double-aqueous phase system

An aqueous two-phase system and extraction technology, applied in the field of analytical chemistry, can solve problems such as reports of no extraction and separation of silver, and achieve the effects of avoiding toxic reagents, high extraction rate and little interference

Inactive Publication Date: 2017-07-07
JIYUAN VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The prior art discloses the application of the small molecule alcohol-salt-water two-phase system to the separation and enrichment of persistent pollutants in the environment such as Pb, Cd, Cr, Hg, etc., but there is no report on the extraction and separation of silver

Method used

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  • Method for extracting and separating silver by double-aqueous phase system
  • Method for extracting and separating silver by double-aqueous phase system
  • Method for extracting and separating silver by double-aqueous phase system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In a 15mL plastic colorimetric tube, add 0.20mL of Ag-containing + solution, 1mL0.2mol L -1 KSCN solution, 1.0mL0.001mol L -1 CTMAB solution, 1mL KCl-HCl buffer solution with pH=1, 3mL propanol, dilute to 10mL with water, then add 2.0g (NH 4 ) 2 SO 4 , oscillated for about 1 min, and stood still for 10 min. The solution was divided into two phases of propanol and water, and the propanol phase was located in the upper layer. Record the volume of the upper layer.

[0053] Upper strata propanol solution directly measures absorbance with flame atomic absorption spectrometry of the present invention, utilizes regression analysis method, reads Ag in the solution by instrument software + The concentration is 0.745μg·mL -1 , the volume of the supernatant is 3.0mL, the calculated Ag + The extraction rate is 103%.

Embodiment 2

[0055] In a 15mL plastic colorimetric tube, add 0.30mL of Ag containing + solution, 0.8mL0.3mol L -1 KSCN solution, 1.0mL0.002mol L -1 CTMAB solution, 1mL KCl-HCl buffer solution with pH=2, 3mL propanol, dilute to 10mL with water, then add 2.0g (NH 4 ) 2 SO 4 , oscillated for about 1 min, and stood still for 10 min. The solution was divided into two phases of propanol and water, and the propanol phase was located in the upper layer. Record the volume of the upper layer.

[0056] Upper strata propanol solution directly measures absorbance with flame atomic absorption spectrometry of the present invention, utilizes regression analysis method, reads Ag in the solution by instrument software + The concentration is 0.522μg·mL -1 , the volume of the supernatant is 3.0mL, the calculated Ag + The extraction rate is 97%.

Embodiment 3

[0058] In a 15mL plastic colorimetric tube, add 0.40mL of Ag containing + solution, 0.6mL0.4mol L -1 KSCN solution, 0.2mL0.1mol L -1 CTMAB solution, 1mL KCl-HCl buffer solution with pH=3, 3mL propanol, dilute to 10mL with water, then add 1.8g (NH 4 ) 2 SO 4 , oscillated for about 1 min, and stood still for 10 min. The solution was divided into two phases of propanol and water, and the propanol phase was located in the upper layer. Record the volume of the upper layer.

[0059] Upper strata propanol solution directly measures absorbance with flame atomic absorption spectrometry of the present invention, utilizes regression analysis method, reads Ag in the solution by instrument software + The concentration is 0.703μg·mL -1 , the volume of the supernatant is 3.0mL, the calculated Ag + The extraction rate is 93%.

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Abstract

The invention provides a method for extracting and separating silver by a double-aqueous phase system. The method comprises the following steps: carrying out mixed extraction on a to-be-separated silver-bearing solution, the double-aqueous phase system and a complexing agent, and carrying out stewing layering, so that silver ions are separated and enter an organic phase, wherein the double-aqueous phase system comprises C2-C3 alcohol, water and a salting-out agent, and the complexing agent is selected from one or more of potassium thiocyanate and hexadecyl trimethyl ammonium bromide. According to the method provided by the invention, the mixed exaction of silver is realized by the double-aqueous phase system and the complexing agent, that is, in the double-aqueous phase system formed by the alcohol, water and the salting-out agent, an ionic associate formed by the extracted silver and the complexing agent, the extraction effect is good, and the extraction rate is high. Compared with the traditional organic solvent extraction method, the method has the advantages of small interference, quick separation, separated phase cleaning and good extraction effect, and meanwhile, the use of toxic reagents is used, thereby being environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a method for extracting and separating silver in a two-phase system. Background technique [0002] Traditional extraction and separation methods mainly use heterogeneous phases that are immiscible with water for extraction. Most extraction solvents are toxic, flammable, and volatile, which will affect the health of analysts, so their application is limited to a certain extent. [0003] Aqueous two-phase extraction refers to the distribution coefficient between the two phases after the separated substance enters the two-phase system due to the influence of surface properties, interaction between charges and various forces (such as water-adding bonds, hydrogen bonds and ionic bonds). K is different, resulting in different concentrations in the upper and lower phases, so as to achieve the purpose of separation. Compared with the traditional organic solvent extraction s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04C22B3/26C22B11/00
CPCB01D11/04C22B11/04C22B3/26Y02P10/20
Inventor 左国强崔海燕郑伟
Owner JIYUAN VOCATIONAL & TECHN COLLEGE
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