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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.2K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.2K
Sulfur Assimilation01:20

Sulfur Assimilation

119
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
119
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

564
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...
564
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

2.5K
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...
2.5K
Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.8K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.8K
Electrophilic Aromatic Substitution: Sulfonation of Benzene01:22

Electrophilic Aromatic Substitution: Sulfonation of Benzene

6.7K
Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
6.7K

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Related Experiment Video

Updated: Oct 9, 2025

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
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Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand

Published on: September 8, 2016

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Selective sulfidation of metal compounds.

Caspar Stinn1, Antoine Allanore2

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature
|December 16, 2021
PubMed
Summary

A novel selective anion exchange process efficiently separates critical metals from mixed oxides. This method reduces energy, water, and chemical use, offering significant environmental and cost benefits for renewable energy infrastructure.

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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Area of Science:

  • Materials Science and Engineering
  • Chemical Engineering
  • Sustainable Chemistry

Background:

  • Growing demand for critical metals (d-block and f-block) essential for renewable energy technologies like magnets, batteries, and electronics.
  • Current extraction methods involving complete dissolution and liquid-liquid separation are energy-intensive, water-consuming, and chemically demanding due to similar metal ion properties.
  • Inefficiencies in existing hydrometallurgical processes lead to high environmental impact and capital costs.

Purpose of the Study:

  • To introduce a new metal-processing approach based on selective anion exchange for efficient metal separation.
  • To demonstrate a method for selectively sulfidizing target metals from mixed metal-oxide feeds.
  • To assess the environmental and economic viability of the proposed selective sulfidation and separation technique.

Main Methods:

  • Development of a selective anion exchange process for metal separation.
  • Utilizing process levers such as gas partial pressure, gas flowrate, and carbon addition to selectively sulfidize target metals from mixed metal-oxide materials.
  • Exploiting physical and chemical differences (density, magnetic susceptibility, surface chemistry) between resulting sulfide and oxide compounds for separation.

Main Results:

  • Demonstrated selective sulfidation of target metals from mixed metal-oxide feeds using controlled process conditions.
  • Process conditions for selective sulfidation were established for 56 elements and experimentally verified for 15.
  • The proposed method offers significantly improved separation compared to traditional liquid-liquid extraction methods.

Conclusions:

  • The selective anion exchange approach provides a more efficient and sustainable method for extracting critical metals.
  • This process has the potential to reduce greenhouse gas emissions by 60-90% and lower capital costs compared to conventional hydrometallurgy.
  • The findings pave the way for more economical and environmentally friendly production of metals vital for the green energy transition.