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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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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.
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Updated: Sep 20, 2025

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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In Situ Chalcogen Leaching Manipulates Reactant Interface toward Efficient Amine Electrooxidation.

Qunlei Wen1, Yu Lin2, Yang Yang1

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, and School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.

ACS Nano
|June 9, 2022
PubMed
Summary
This summary is machine-generated.

Chalcogen leaching from catalysts during electrocatalysis creates charged chalcogenates. These ions enhance amine electrooxidation by enriching amines on the catalyst surface and activating C-N bonds for high selectivity.

Keywords:
amineschalcogen leachingchalcogenideelectrooxidation reactionreactant interface

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Catalyst structural reconstruction limits electrocatalytic process efficiency.
  • Engineering the reaction interface is crucial for advanced electrocatalysis.

Purpose of the Study:

  • To investigate operando electrocatalysis variations for manipulating the reactant interface.
  • To understand the role of chalcogen atoms in amine electrooxidation.

Main Methods:

  • Utilizing operando electrocatalysis to induce chalcogen leaching.
  • Employing operando techniques to study catalyst surface changes.
  • Chalcogen-doped Ni(OH)2 as an example catalyst.

Main Results:

  • Chalcogens leach and form adsorbed chalcogenates on NiOOH surface during electrooxidation.
  • Chalcogenates induce local electric fields, enriching polar amines on the catalyst.
  • Enhanced C-N bond activation leads to high selectivity for propionitrile.

Conclusions:

  • Operando catalyst changes can be used to rationally design efficient electrocatalysts.
  • Chalcogenate ions play a key role in promoting amine electrooxidation and C-N bond activation.