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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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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...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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CNT-Strung LiMn2 O4 for Lithium Extraction with High Selectivity and Stability.

Xiaohong Shang1, Jianyun Liu1,2, Bin Hu1

  • 1College of Environmental Science and Engineering, Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection, Donghua University, Shanghai, 201620, P. R. China.

Small Methods
|May 13, 2022
PubMed
Summary

Researchers developed a novel carbon nanotube-strung lithium manganese oxide (CNT-s-LMO) for efficient lithium extraction. This material shows enhanced conductivity and stability, improving lithium recovery from brines.

Keywords:
CNT-strung LiMn 2O 4Li + extractioncapacitive deionizationhigh selectivitysuperior stability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Science

Background:

  • Lithium manganese oxide (LiMn2 O4) shows promise for lithium extraction but suffers from poor cycle stability and conductivity.
  • Existing methods for lithium recovery face challenges in selectivity and efficiency, particularly in complex brines.

Purpose of the Study:

  • To develop a highly conductive and stable lithium manganese oxide material for electrochemical lithium extraction.
  • To improve the selectivity and efficiency of lithium ion (Li+) recovery from brines and seawater.

Main Methods:

  • A two-step strategy involving stringing manganese oxide (Mn3 O4) particles with multiwalled carbon nanotubes (CNTs).
  • Hydrothermal lithiation to convert the hybrid material into CNT-strung LiMn2 O4 (CNT-s-LMO).
  • Fabrication of a hybrid capacitive deionization (HCDI) cell using the synthesized CNT-s-LMO electrode.

Main Results:

  • The CNT-s-LMO material exhibited a unique net-like structure with excellent conductivity and enhanced electrochemical performance.
  • The HCDI cell achieved a high Li+ extraction percentage of approximately 84% and a superior separation factor of approximately 181 for lithium selectivity.
  • The CNT-s-LMO based HCDI cell demonstrated remarkable stability, retaining 90% capacity over 100 cycles with negligible manganese loss.

Conclusions:

  • The developed CNT-s-LMO material offers a promising solution for efficient and selective electrochemical lithium extraction.
  • This fabrication method provides a new pathway for creating advanced carbon-enabled absorbents for lithium recovery.
  • The findings contribute to addressing the growing demand for lithium and improving the sustainability of lithium-ion battery production.