A further simplification of the revised physical adsorption (RPA) model

• Published in: Journal of colloid and interface science Vol. 267; no. 2; pp. 259 - 264
• Main Authors: Hao, X., Spieker, W.A., Regalbuto, J.R.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15-11-2003; Elsevier
• Subjects: Chemistry; Coulombic and solvation effects; Exact sciences and technology; General and physical chemistry; Noble metal catalyst impregnation; Physical adsorption theory; Solid-liquid interface; Surface physical chemistry; Physical adsorption theory; Noble metal catalyst impregnation; Coulombic and solvation effects; Solvent effect; Liquid solid interface; Liquid solid adsorption; Electrostatic interaction; Theoretical study; Transition metal Complexes; Coulomb interaction; Platinum complex; Aluminium Oxides; Hydroxo complex; Physical model; Chloro complex; Aqueous solution
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/S0021-9797(03)00644-1

We present a further simplification of the essentially parameter-free revised physical adsorption model (K. Agashe, J.R. Regalbuto, J. Colloid Interface Sci. 185 (1997) 174) in this paper. It has been discovered that a physical adsorption model describing the uptake of various metal complexes from aqueous solutions onto oxide surfaces can most accurately simulate experimental data when the model contains only a coulombic energy term, and not a solvation energy term. The results of the simulation for cobalt/silica, chloroplatinic acid (CPA)/alumina, and tetraamonium platinate (TAP)/alumina and silica are presented here. A reasonable justification for the omission of this term is that solvation effects are negligible when adsorbing metal complexes retain one or more hydration sheaths.