Monte Carlo simulation of the adsorption of phenol on gold electrodes: a simple model

• Main Authors: Neves Rodrigo S., Motheo Artur J., Fernandes Fernando M. S. Silva, Fartaria Rui P. S.
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2004-01-01
• Series: Journal of the Brazilian Chemical Society
• Subjects: phenol adsorption; gold electrode; Monte Carlo simulation; mean force potential
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000200011

Canonical Monte Carlo simulations, at 298 K, of the adsorption of phenol in a dilute aqueous solution on gold electrodes, at the potential of zero charge, are presented. The results suggest that the process occurs in two distinct and successive steps. Adsorption starts with the phenol oxygen atom pointing towards the gold surface and the aromatic ring in a quasi-perpendicular orientation relative to the surface. This is followed by the reorientation of the aromatic ring to a parallel configuration. The effect of the solvent is analyzed through the calculation of the potential of mean force acting on phenol. Despite the simplicity of the model and the interaction potentials used in the simulations, the results are in good agreement with experimental observations, giving insight into the microscopic details of the adsorption process of phenol at low concentrations.