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Related Concept Videos

Electrodeposition01:08

Electrodeposition

758
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...
758
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
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

376
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
376
Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

548
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

2.4K
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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Related Experiment Video

Updated: Oct 3, 2025

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Ferrous-based electrolyte for simultaneous NO absorption and electroreduction to NH3 using Au/rGO electrode.

Yongheng Xiong1, Yuting Li1, Shipeng Wan1

  • 1School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.

Journal of Hazardous Materials
|February 14, 2022
PubMed
Summary

Electrochemical reduction of nitrogen oxides (NO) to ammonia (NH3) offers a sustainable method for NO removal and NH3 production. This study utilizes ferrous chelate electrolytes and rGO/Au catalysts for efficient NO absorption and conversion.

Keywords:
Ferrous regenerationNH(3) synthesisNO absorptionNO electroreduction

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Area of Science:

  • Electrochemistry
  • Catalysis
  • Environmental Engineering

Background:

  • Nitrogen oxides (NO) removal is crucial for environmental protection.
  • Electrochemical reduction of NO to ammonia (NORR) presents a promising, mild approach for NO abatement and ammonia synthesis.
  • Effective NO absorption and catalyst regeneration are key challenges in practical NORR applications.

Purpose of the Study:

  • To investigate the use of ferrous chelate as an electrolyte for NO absorption in NORR.
  • To develop and evaluate reduced graphene oxide (rGO) and gold-decorated rGO (Au/rGO) catalysts for efficient NO reduction.
  • To optimize NORR performance by examining parameters like applied potential and pH.

Main Methods:

  • Electrochemical reduction experiments were conducted using ferrous chelate electrolytes.
  • Reduced graphene oxide (rGO) and Au/rGO were synthesized and employed as cathode catalysts.
  • The efficiency of ferrous regeneration and NO reduction was analyzed.
  • Ammonia yield, selectivity, and Faradaic efficiency were measured under varying conditions.

Main Results:

  • Ferrous chelate effectively absorbed NO, facilitating NORR.
  • rGO electrodes enabled ferric chelate reduction at lower onset potentials.
  • Au/rGO catalysts demonstrated high NH3 yield (14.6 μmol*h-1*cm-2) and selectivity (65.2%) at -0.1 V and pH 6.32.
  • A high Faradaic efficiency of 98.3% for NH3 was achieved at pH 1.0.

Conclusions:

  • Ferrous chelate electrolytes combined with rGO-based catalysts offer an effective system for NO absorption and electrochemical conversion to NH3.
  • The Au/rGO catalyst shows significant potential for sustainable NO removal and valuable ammonia production.
  • This research provides a valuable reference for advancing electrochemical de-NO technologies.