Investigation of Hexylamine Adsorption on Gold in Perchloric Acid

The adsorption of hexylamine at the solution-gold interface in 1 M HClO in the presence of 0.1 M Fe and 0.1 Fe was studied by potentiodynamic, chronoamperometric and EIS methods. The main kinetic characteristics of the oxidation-reduction reaction iron ions (exchange current density, transfer coeffi...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-06, Vol.28 (13), p.5070
Main Authors: Ostapenko, Gennady I, Kalashnikova, Nina A
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Chemical reduction
chronoamperometry
Comparative analysis
Corrosion
cyclic voltammetry
Diffusion coefficient
Electrodes
Equilibrium
Gold
hexylamine
Hydrogen
Hydrophobicity
Interfaces
Investigations
Ions
Iron
Kinetics
Metals
Oxidation
Oxidation-reduction potential
Perchloric acid
Redox reactions
surfactant
Surfactants
Water
Water chemistry
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Summary:The adsorption of hexylamine at the solution-gold interface in 1 M HClO in the presence of 0.1 M Fe and 0.1 Fe was studied by potentiodynamic, chronoamperometric and EIS methods. The main kinetic characteristics of the oxidation-reduction reaction iron ions (exchange current density, transfer coefficient, diffusion coefficients of iron ions) were determined. It was shown that the physical adsorption of hexylamine on gold can be described by the Dhar-Flory-Huggins isotherm. The values of the adsorption constant and the Gibbs free adsorption energy were obtained. A comparison of the free adsorption energy at these interfaces with the interaction energies of hexylamine and water molecules, and hexylamine molecules with each other was carried out. It was shown that hexylamine adsorption at all of these interfaces is due mainly to the hydrophobic effect of the interaction of hexylamine and water molecules.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28135070