Sonochemical dissolution of MnO2 colloids

Abstract

The dissolution of colloidal MnO₂ in aqueous solution induced by ultrasound has been investigated in the absence and presence of aliphatic alcohols at a pH of 4.5. It was found that the presence of the alcohols greatly enhanced the amount and rate of the dissolution of MnO₂. It is shown that the rate of dissolution can be directly related to the Gibbs surface excess of the alcohol at the air/water interface. A simple quantitative model is proposed to account for these observations.