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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
444
Masking and Demasking Agents01:19

Masking and Demasking Agents

2.4K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
2.4K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.8K
Colloidal precipitates01:09

Colloidal precipitates

560
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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Highly Efficient and Selective Extraction of Gold from Thiosulfate Leaching Solution Using Functionalized Dicationic

Qiang Zhou1, Yunchang Fan1, Sheli Zhang2

  • 1College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China.

Molecules (Basel, Switzerland)
|June 19, 2024
PubMed
Summary

Dicationic ionic liquids (DILs) offer a greener alternative for gold recovery from thiosulfate solutions. These novel solvents demonstrate enhanced extraction of gold-thiosulfate complexes, overcoming limitations of traditional methods.

Keywords:
extractionfunctionalized dicationic ionic liquids (DILs)gold recoverythiosulfate leaching

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Area of Science:

  • Materials Science
  • Hydrometallurgy
  • Green Chemistry

Background:

  • Thiosulfate leaching is a promising alternative to cyanidation for gold recovery.
  • Current methods face challenges in recovering low gold concentrations from thiosulfate solutions.
  • Liquid-liquid extraction is limited by volatile and toxic organic solvents.

Purpose of the Study:

  • To synthesize functionalized dicationic ionic liquids (DILs) for gold recovery.
  • To evaluate DILs as environmentally friendly extraction solvents for gold-thiosulfate complexes.
  • To investigate the mechanism and influencing factors of gold extraction using DILs.

Main Methods:

  • Synthesis of functionalized dicationic ionic liquids (DILs).
  • Experimental extraction of gold-thiosulfate complex ([Au(S2O3)2]3-) using DILs.
  • Analysis of extraction rates, mechanisms (anion exchange, endothermic process), and selectivity.

Main Results:

  • DILs exhibited higher extraction rates for [Au(S2O3)2]3- compared to monocationic counterparts due to stronger electrostatic interactions.
  • Extraction is an anion exchange and endothermic process, rate-limited by the interface.
  • ILs with anions possessing strong hydrogen-bonding ability showed high extraction efficiency.

Conclusions:

  • DILs are effective and selective solvents for recovering gold-thiosulfate complexes from leaching solutions.
  • DILs present a viable, environmentally friendly alternative to conventional organic solvents in gold recovery.
  • The study highlights the potential of tailored ionic liquids for sustainable hydrometallurgical processes.