Accession Number : AD0467670


Title :   PROTON ADSORPTION AT THE FERRIC OXIDE/AQUEOUS SOLUTION INTERFACE. I. A KINETIC STUDY OF ADSORPTION.


Descriptive Note : Technical rept.,


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE


Personal Author(s) : Onoda, G Y , Jr


Report Date : Aug 1965


Pagination or Media Count : 40


Abstract : 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)


Descriptors :   *ADSORPTION , *SOLUTIONS(MIXTURES) , IRON COMPOUNDS , OXIDES , PH FACTOR , SURFACE PROPERTIES , OXYGEN , CHEMICAL EQUILIBRIUM


Distribution Statement : APPROVED FOR PUBLIC RELEASE