Proton Adsorption at the Ferric Oxide/Aqueous Solution Interface. I. A Kinetic Study of Adsorption.

摘要

A kinetic study of the adsorption of potentialdetermining ions (H+) at the ferric oxide (AlphaFe2O3)/solution interface is reported. The experimental results obtained by potentiometric titrations of suspensions of the synthetically-prepared solid indicate that a two-step process operates at the interface. The observed results may be explained by a rapid adsorption (or desorption) of protons at the surface of the oxide, followed by the slow diffusion of the adsorbed proton into (or out of) a goethite-like interphase separating the bulk anhydrous oxide from the solution phase. Corroborative evidence for the proposed model and mechanism is supplied. (Author)