On the validity of specific rate constants (kSA) in Fe0/H2O systems

Abstract

The validity of the specific reaction rate constants (kSA) in modelling contaminant removal in Fe0/H2O systems is questioned. It is shown that the current kSA-model does not consider the large reactive surface area provided by the in-situ formed oxide film, and thus the adsorptive interactions between contaminants and film materials. Furthermore, neither the dynamic nature of film formation nor the fact that Fe0 surface is shielded by the film is considered. Suggestions are made how the kSA-model could be further developed to possibly meet its original goal.