Enhancement of neutralization reaction in colloidal ferric hydrous oxide

Abstract

Neutralization reaction was investigated in negative ferric hydrous oxide sols. The adsorption isotherm of OH^- ions on the surface of colloidal particles was measured to provide the variation of their charge with pH. Impulse radiolysis generated the reacting ions in the sol. Using a fast DC conductivity setup for detection, a significant increase in the neutralization rate coefficient was found at low OH^- concentrations. The phenomenon was discussed in terms of the theory of diffusion controlled reactions for particles interacting with Coulomb and Yukawa potential.